JP7357257B2 - Adhesion structure and adhesion method of steel shoring in mountain tunnel construction method - Google Patents

Description

The present invention relates to an adhesion structure and adhesion method for steel shoring in mountain tunnel construction, and in particular, to The present invention relates to an adhesion structure and adhesion method for steel shoring in a mountain tunnel construction method in which the outer circumferential surface of the steel shoring and the excavated inner wall surface are brought into close contact with each other in areas where the amount of over-excavation is large.

In the mountain tunnel construction method, for example, before constructing a secondary lining using tunnel lining formwork (centre), a primary lining using shotcrete or shotcrete mortar is constructed on the inner wall surface of the tunnel excavation. The primary lining consists of multiple steel shorings installed at intervals in the axial direction of the tunnel and extending in the circumferential direction to absorb the load from the inner wall of the tunnel immediately after excavation. It is formed by spraying shotcrete or shotcrete mortar to a predetermined thickness onto the spaced portions of these steel shorings while supporting them.

For this reason, the steel shoring is installed in the circumferential direction along the inner wall surface of the excavation of the tunnel, and is firmly attached to the inner wall surface of the excavation so that it can efficiently support the load from the inner wall surface of the excavation. Therefore, especially in the arch-shaped upper part of the tunnel, apply hardening material such as mortar to the gap between the outer circumferential surface of the built steel shoring and the excavated inner wall surface. By injecting the filler and curing it, these are brought into close contact.

In addition, as a construction method that brings the outer circumferential surface of the erected steel shoring into close contact with the excavated inner wall surface, the contact back method is preferably known. A filling bag made of cloth, for example, into which a hardening filler such as mortar is injected and filled is provided in the space between the outer peripheral surface and the inner wall surface of the excavation, and the provided filling bag preferably has a non-breathing property. By filling the bag with quick-hardening mortar, the expanded filling bag is brought into close contact with both the outer circumferential surface of the steel shoring and the inner wall surface of the excavation, thereby integrating them. (For example, see Patent Document 1 and Patent Document 2).

Japanese Patent Application Publication No. 2001-12198 Japanese Patent Application Publication No. 2004-27495 Japanese Patent Application Publication No. 2001-295598

On the other hand, the inner wall surface of the excavated tunnel is the same size as the designed excavation cross section plus a slight extra trench so that the primary lining made of shotcrete or shotcrete mortar can maintain the specified sufficient thickness. However, since the over-excavation area is not necessarily excavated with high precision, the inner wall surface of the excavation is uneven, and the amount of over-excavation is larger than other areas, resulting in a concave area of considerable depth. may occur. In areas where such deep recesses have occurred, a larger gap remains between the outer peripheral surface of the erected steel shoring and the excavated inner wall surface than in other areas. Therefore, in areas with such large gaps, it is necessary to simply inject and inflate the hardening filler into a filling bag placed in the gap between the outer peripheral surface of the steel shoring and the inner wall of the excavation. In this case, it becomes difficult to make the filling bag reach the inner wall surface of the excavation and bring it into sufficient contact with the inner wall surface of the excavation.

For this reason, for example, Patent Document 3 discloses that a fiber-based shoring structure in which a hardening filler such as mortar is press-fitted into a portion where the distance between the outer circumferential surface of the steel shoring and the excavated inner wall surface is large. By inserting and arranging the bags in a double layered manner, the expanded fiber bags are brought into close contact with the inner wall surface of the tunnel excavation, but according to the method of Patent Document 3, the steel shoring After the steel shoring was erected, the fiber bags were manually inserted into the area where the gap between the outer circumferential surface of the steel shoring and the excavated inner wall was large, in a double layered manner. Not only is this work difficult to perform and requires a lot of time and effort, but when inflating the double-layered fiber bags, it is difficult to maintain stable contact with the inner wall surface of the tunnel excavation. It is difficult to do so.

The present invention enables, without much effort, to connect the outer circumferential surface of steel shoring and the inside of the excavation via a filling bag in a portion of the excavated inner wall surface of a tunnel where the amount of over-excavation is larger than other areas. An object of the present invention is to provide a structure and method for adhering steel shoring to a wall surface in a simple and stable manner in a mountain tunnel construction method.

The present invention relates to a mountain tunnel construction method in which a tunnel is installed between an excavated inner wall surface of a tunnel having a cross-sectional shape including an arch-shaped portion at the upper part and an outer circumferential surface of a steel shoring installed along the excavated inner wall surface. The steel shoring is brought into close contact with the outer circumferential surface of the steel shoring and the excavated inner wall surface in a portion of the excavated inner wall surface where the amount of over-excavation is larger than in other areas through a filling bag body. In the structure, a double layer is provided at a position corresponding to a portion where the amount of excess excavation is increased in the outer portion of the filling bag body which is attached to the outer circumferential surface of the steel shoring so as to extend in the circumferential direction. A sheet member for forming an inflatable portion is integrally provided, and the sheet member for forming a double inflatable portion is integrally attached to an outer portion of the filling bag body by attaching a cylindrical bag material formed in a cylindrical shape. The sheet member for forming the double expansion part is attached to the outer part of the filling bag body via a clip, via an elastic band, or via a hook-and-loop fastener. The filling bag is attached so as to be adjustable in position, and the filling bag is inflated by supplying a fluid curable filler to the filling bag, and a curable filler is provided inside the double expansion portion forming sheet member. The outer portion of the sheet member for forming a double expansion portion is expanded by supplying a filler to expand the sheet member for forming a double expansion portion, and the curable filler supplied thereto is cured. However, the steel shoring is in close contact with the excavated inner wall surface of the tunnel in the area where the amount of extra excavation has increased, and the load from the inner excavated wall surface is supported by the steel shoring in the area where the amount of extra excavation has become large. The above objective has been achieved by providing a close-fitting structure for steel shoring in mountain tunnel construction methods.

Further, in the close contact structure of the steel shoring in the mountain tunnel construction method of the present invention, the filling bag body is integrally attached to the outside of the outer fastener face material forming the sheet fastener, and the steel shoring An inner zipper face material forming a sheet fastener is integrally attached to the outer circumferential surface of the filling bag, and when the outer fastener face material is engaged with the inner fastener face material, the filling bag body It is preferable that it be attached to a predetermined position in the circumferential direction of the steel shoring.

Furthermore, in the close contact structure of the steel shoring in the mountain tunnel construction method of the present invention, the double expansion part forming sheet member has a planar shape in the form of a longitudinal strip, and the longitudinal direction is the extending direction of the filling bag body. It is preferable that the filling bag body is provided integrally with the outside portion of the filling bag body along the same line.

Furthermore, in the close contact structure of the steel shoring in the mountain tunnel construction method of the present invention, the sheet member for forming the double expansion part has a planar shape of a vertically long strip, and the vertical direction is the extension of the filling bag body. It is preferable that the filling bag body is provided integrally with the outside portion of the filling bag body along a direction intersecting the filling bag body.

Further, the close contact structure of the steel shoring in the mountain tunnel construction method of the present invention is such that the double expansion part forming sheet member is attached in plurality in series along the extending direction of the filling bag body. and on the inside of the double expansion part forming sheet member selected from the plurality of double expansion part forming sheet members and arranged in a part corresponding to the part where the overextension amount is increased, It is preferable that a curable filler is supplied and the outer portion of the filler is in close contact with the excavated inner wall surface of the tunnel in the portion where the amount of over-excavation is increased.

Further, in the mountain tunnel construction method, the present invention provides a structure between an excavated inner wall surface of a tunnel having a cross-sectional shape including an arch-shaped portion at the upper part and an outer circumferential surface of a steel shoring installed along the excavated inner wall surface. Steel shoring that brings the outer circumferential surface of the steel shoring into close contact with the excavated inner wall surface in a portion of the excavated inner wall surface where the amount of over-excavation is larger than other areas through the installed filling bag body. In this method, the filling bag body is attached to the outer peripheral surface of the steel shoring installed along the inner wall surface of an excavated tunnel, and the filling bag body is attached so as to extend in the circumferential direction. A sheet member for forming a double expansion part is integrally provided at a position corresponding to the part where the amount of excess excavation has increased in the outer part of the tunnel, and the steel shoring is installed along the inner wall surface of the tunnel excavation. In this state, a curable filler having fluidity is supplied to the filled bag body to inflate the filled bag body, and a curable filler is supplied to the inside of the double expansion part forming sheet member. By doing so, the double expansion part forming sheet member is expanded, and the curable filler supplied thereto is cured, so that the outer portion of the expanded double expansion part forming sheet member is The steel shoring is brought into close contact with the excavated inner wall surface of the tunnel in the portion where the amount of over-excavation has increased, so that the load from the excavated inner wall surface is supported by the steel shoring in the portion where the amount of over-excavation has increased. , and the double expansion part forming sheet member is attached to the outer part of the filling bag body so that its position can be adjusted, and after the steel shoring is installed along the excavated inner wall surface of the tunnel, the filling bag is By adjusting the position of the sheet member for forming the double expansion part in the outer part of the bag body and supplying the curable filler to the inner side, the outer part of this is changed to the part where the amount of extra excavation has become large. The above object has been achieved by providing a method for adhering a steel support in close contact with the inner wall surface of a tunnel excavation in a mountain tunnel construction method.

According to the close contact structure and close contact method of steel shoring in the mountain tunnel construction method of the present invention, without requiring much effort, in the portion of the excavated inner wall surface of the tunnel where the amount of excess excavation is larger than other areas, The outer circumferential surface of the steel shoring and the excavated inner wall surface can be easily and stably brought into close contact with each other through the filling bag.

FIG. 1 is a cross-sectional view of a mountain tunnel illustrating a method of adhering steel supports in the mountain tunnel construction method of the present invention. 2(a) is an enlarged sectional view taken along line AA in FIG. 1, and FIG. 2(b) is an enlarged view of section B in FIG. FIGS. 3A and 3B are enlarged cross-sectional views illustrating how the filling bag is attached to the steel shoring. FIG. 4 is a perspective view illustrating a filling bag to which an inlet member is attached and a sheet member for forming a double expansion part. FIG. 5(a) is a plan view of the filled bag before being filled with the curable filler, and FIG. 5(b) is a sectional view taken along line CC in FIG. 5(a). It is a sectional view explaining another form of the close contact method of steel shoring. 3(a) is a plan view, and FIG. 3(b) is a cross-sectional view taken along line DD in FIG. 3(a) is a plan view, and FIG. 3(b) and FIG. 3(a) are sectional views taken along line EE of FIG. 3(a) is a plan view, and FIG. 3(b) is a cross-sectional view taken along the line FF in FIG. FIG. 3 is a cross-sectional view illustrating a method of attaching the double-inflated portion forming sheet member to the filling bag body. FIG. 3 is a schematic plan view illustrating a state in which a plurality of sheet members for forming a double-inflated portion are arranged in a row along the extending direction of a filling bag body. FIG. 3 is a schematic plan view illustrating a state in which the sheet member for forming a double-inflated portion is attached with its longitudinal direction along a direction intersecting the extending direction of the filling bag body.

As shown in FIG. 1, a close contact structure 10 and a close contact method for steel shoring in a mountain tunnel construction method according to a preferred embodiment of the present invention are applied to an upper part of a steel shoring excavated by a known mountain tunnel construction method such as the NATM construction method. In a tunnel 30 having a cross-sectional shape including an arch-shaped portion, preferably having a horseshoe-shaped cross-sectional shape, the outer periphery of the steel shoring 20 in the upper region R of 120° in the circumferential direction centered on the zenith portion 31. The surface is brought into close contact with the excavated inner wall surface 32 of the tunnel 30 so that these can be integrated, and in particular, in the portion 33 where the amount of excess excavation is larger than other areas on the excavated inner wall surface 32. , was adopted as a structure and method for allowing the outer circumferential surface of the steel shoring 20 and the excavated inner wall surface 32 to be brought into close contact. The adhesion structure 10 and adhesion method of steel shoring according to the present embodiment allow filling in the portion 33 of the excavated inner wall surface 32 of the tunnel 30 where the amount of excess excavation is larger than other areas, without requiring much effort. It has a function of allowing the outer circumferential surface of the steel shoring 20 and the excavated inner wall surface 32 to be brought into close contact with each other easily and stably via the bag body 11.

In the mountain tunnel construction method, the steel shoring adhesion structure 10 of this embodiment is installed along the excavated inner wall surface 32 of the tunnel 30 having a cross-sectional shape including an arch-shaped portion at the upper part. Through the filling bag 11 installed between the outer peripheral surface of the steel shoring 20 and the outer peripheral surface of the steel shoring 20, the steel shoring 20 is It has a close contact structure that brings the outer circumferential surface and the excavated inner wall surface 32 into close contact, and is attached to the outer circumferential surface of the steel shoring 20 so as to extend in the circumferential direction, as shown in FIGS. 2(a) and 2(b). A sheet member 18 for forming a double expansion portion is integrally provided at a position corresponding to the portion 33 where the amount of overextension has increased in the outer portion of the filling bag 11, which imparts fluidity to the filling bag 11. The filled bag body 11 is expanded by supplying the curable filler 15, and the curable filler 15 is supplied to the inside of the sheet member 18 for forming the double-expanded portion. 18 and the curable filler 15 supplied thereto is cured, so that the outer portion of the expanded double-expanded portion forming sheet member 18 becomes the tunnel 30 of the portion 33 where the amount of excess excavation is increased. The load from the excavated inner wall surface 32 is supported by the steel shoring 20 in a portion 33 where the excavated inner wall surface 32 is in close contact with the excavated inner wall surface 32 and the amount of over-excavation is large.

Further, in this embodiment, the filling bag body 11 is integrally attached to the outside of the outer fastener face material 14 that forms the sheet fastener 12, and the sheet fastener is attached to the outer peripheral surface of the steel shoring 20. The inner fastener face material 13 forming the inner fastener face material 12 is attached as one body, and by the engagement of the outer fastener face material 14 with the inner fastener face material 13, the filling bag body 11 is moved in the circumferential direction of the steel shoring 20. It is designed to be attached at a predetermined position in Y.

Furthermore, in this embodiment, a plurality of filling bags 11 are attached to each steel shoring 20, preferably in series in the circumferential direction Y of the steel shoring 20. In this embodiment, in the tunnel 30, which preferably has a horseshoe-shaped cross-sectional shape, the steel shoring 20 is continuously provided in the circumferential direction Y, for example, in an upper 120° region R in the circumferential direction Y centering on the zenith portion 31. Four filling bags 11 are attached.

Furthermore, in the present embodiment, the filling bag body 11 preferably includes a cylindrical bag material 16 formed in a cylindrical shape separately from the outer fastener surface material 14 and joined to the outer fastener surface material 14 by overlapping the same. As a result, it is integrally attached to the outer fastener face member 14.

In this embodiment, the steel shoring 20 installed along the excavated inner wall surface 32 of the tunnel 30 is made by bending, for example, H-shaped steel so that it has a shape that follows the excavated inner wall surface 32 of the tunnel 30. can be formed. The steel shoring 20 is disposed along the excavated inner wall surface 32 of the tunnel 30 by a known construction method as the excavation work of the tunnel 30 progresses in a region close to the face of the tunnel 30. They are installed one after another in the excavation direction X of the tunnel 30 (see FIG. 2) at intervals of, for example, about 100 cm, with the outer flange 20a serving as the outer peripheral surface facing the excavated inner wall surface 32 of the tunnel 30. become. Since there is a gap between the outer circumferential surface formed by the outer flange 20a of each installed steel shoring 20 and the excavated inner wall surface 32 of the tunnel 30, these gaps are narrowed down. Then, the filling bag body 11 is provided.

Furthermore, in this embodiment, the sheet fastener 12 for attaching the filling bag 11 to the outer peripheral surface of the outer flange 20a of the steel shoring 20 uses a known mechanical fastener known as Velcro (registered trademark), for example. be able to. The planar fastener 12 includes a male fastener material 13 fixed to a base sheet 13a with a large number of hooks erected thereon, and a female fastener material 13 fixed to a base sheet 14a with a large number of loops erected thereon. For example, by fixing the base material sheet 13a to the steel shoring 20 via an adhesive, using the male side fastener material as the inner fastener face material 13, the outer flange 20a of the steel shoring 20 is fixed. It can be firmly fixed and attached to the outer circumferential surface 20a as an integral part so as to cover the outer circumferential surface thereof. Further, for example, the female side fastener material can be used as the outer fastener face material 14, and a filling bag body 11, which will be described later, can be firmly attached to the outer peripheral surface of the outer fastener surface material 14 as one body, for example, via an adhesive. The female side fastener material 14 may be made of a nonwoven fabric or the like in which a large number of loop bodies are erected. The inner fastener face material 13 does not necessarily have to be fixed to cover the entire width of the tunnel 30 in the excavation direction X on the outer peripheral surface of the outer flange 20a of the steel shoring 20. Even if it is fixed to cover about half of the steel shoring 20, the filling bag body 11, which will be described later, can be stably attached to the outer circumferential surface 20a of the steel shoring 20 by attaching the outer fastener face material 14. become.

In this embodiment, the filling bag body 11 constituting the close contact structure 10 of the steel shoring is composed of, for example, a cylindrical bag material 16 formed in a cylindrical shape separately from the outer fastener face material 14. The material 16 is preferably made of stretchable fabric. Further, the cylindrical bag material 16 is firmly attached to the outer zipper surface material 14 by overlapping its bottom portion 16a on the base material sheet 14a of the outer zipper surface material 14 and bonding it with, for example, an adhesive. It can be fixed and attached. The outer fastener surface material 14 to which the bottom surface portion 16a of the cylindrical bag material 16 is joined also covers the entire width of the tunnel 30 in the excavation direction X on the outer peripheral surface formed by the outer flange 20a of the steel shoring 20. It is not necessarily necessary, for example, even if there is something that covers about half the width, the filling bag body 11 that is attached to the inner zipper face material 13 and integrated with the outer zipper face material 14, It becomes possible to attach it to the outer circumferential surface 20a of the steel shoring 20 in a stable state.

The cylindrical bag material 16, which becomes the filling bag body 11, is preferably made of a cloth that is watertight, flexible, has excellent filling properties, and has excellent workability, such as a cloth using polyester yarn such as Tetoron yarn. Can be formed as a bag. By using the cylindrical bag material 16 as a cloth bag made of fabric using polyester yarn, it is possible to form the filling bag body 11 using the cylindrical bag material 16 that is strong, lightweight, and has excellent flexibility. become.

Further, as shown in FIG. 5(a), the cylindrical bag material 16 has a vertical length of, for example, 2000 to 2500 mm along the length direction of the outer flange 20a of the steel shoring 20, and a width of, for example, 190 mm. It can be formed to have a vertically long strip-like planar shape. As shown in FIG. 5(b), the cylindrical bag material 16 preferably includes a sheet material of the bottom portion 16a which is overlapped and joined to the base material sheet 14a of the outer fastener face material 14, and a sheet material having a width larger than this. The sheet material of the upper elastic portion 16b is joined by sewing the side edges and end edges of these sheet materials to each other, and the curable filler 15 is supplied and filled inside these sheets. It holds the space of

Furthermore, in this embodiment, when the tubular bag material 16 is attached to a predetermined position in the circumferential direction Y on the outer circumferential surface by the outer flange 20a of the steel shoring 20, In addition, a double expansion portion forming sheet member 18 is attached to a position corresponding to a portion 33 of the excavated inner wall surface 32 where the amount of excess excavation is increased, by joining its peripheral portion by sewing, for example. The sheet member 18 for forming the double expansion part is preferably made of polyester thread such as Tetoron thread as a fabric that has waterproof properties, is flexible and has excellent filling properties, and has excellent workability, similarly to the cylindrical bag material 16. It can be formed as a sheet member using fabric. The double expansion portion forming sheet member 18 is formed to have a planar shape such as a rectangular shape, a circular shape, an elliptical shape, etc., corresponding to the shape and size of the portion 33 where the amount of over-excavation has increased. , by joining the peripheral edge portion to the outer peripheral portion of the cylindrical bag material 16 at an interval narrower than the vertical width and horizontal width of the sheet member 18 for forming the double-inflated portion, the outer peripheral surface of the cylindrical bag material 16 and A space is maintained between them, which can be filled with a curable filler (see FIG. 5(b)). In the present embodiment, the double expansion part forming sheet member 18 has a planar shape of a longitudinally elongated band, and is attached to the outer part of the filling bag 11 with its longitudinal direction along the extending direction of the filling bag 11. It is set up as one unit.

Here, in this embodiment, the cylindrical bag material 16 that becomes the filling bag 11 and the sheet member 18 for forming the double expansion part are made of stretchable fabric, and the steel shoring 20 to which the filling bag 11 is attached is used. It is preferable that the material is formed using a fabric that has a small elasticity in the circumferential direction Y and a large elasticity in a direction perpendicular to the circumferential direction Y (the excavation direction X) along the outer circumferential surface 20a. As a result, the cylindrical bag material 16 is supplied to the filling bag 11 and the space between this and the double-inflatable part-forming sheet member 18 and filled. Due to its weight, the curable filler 15 in a fluidized state tends to accumulate in the lower part of these parts and is biased, causing the balance to be lost, and the expanded filling bag 11 and the sheet member 18 for forming the double expansion part to be formed in the tunnel 30. This makes it possible to effectively avoid making it difficult to make close contact with the excavated inner wall surface 32 and the portion 33 where the amount of over-excavation has become large. A fabric that makes it possible to reduce elasticity in the circumferential direction Y along the outer circumferential surface 20a of the steel shoring 20 in the tubular bag material 16, and increase elasticity in the excavation direction X perpendicular to the circumferential direction Y. For example, polyester yarn is used in the vertical direction, which has high strength and low elasticity, resulting in high dimensional stability, while specially processed nylon yarn is used in the horizontal direction, which has high elasticity. For example, the product name "Grout Jacket" (manufactured by Daika Sangyo Co., Ltd.), which is known as a fabric with a woven fabric, can be used.

In addition, in this embodiment, as shown in FIG. 4, one longitudinal edge of the cylindrical bag material 16, which becomes the filling bag body 11, is provided with a sewn portion passing through the sewn portion. A cylindrical inlet member 17 made of the same fabric as the cylindrical bag material 16 and having a diameter smaller than that of the cylindrical bag material 16 is attached. Furthermore, the peripheral part of the double-inflated part forming sheet member 18 attached to the outer part of the cylindrical bag material 16 which becomes the filling bag body 11 is also penetrated through the sewn joint part thereof. A cylindrical double-inflated inlet member 19 made of fabric is attached. The injection port member 17 is attached with the injection port 17a protruding to the outside of the cylindrical bag material 16, and the insertion side portion thereof preferably inserted into the inside of the cylindrical bag material 16 by about 300 mm or more. The double expansion part inlet member 19 has the injection port 19a protruding to the outside of the double expansion part forming sheet member 18, and the insertion side portion is preferably about 150 mm or more, and the double expansion part forming sheet member 18 has an injection port 19a. It is installed by being inserted inside. By these, when the curable filler 15 in a fluid state is supplied and filled inside the cylindrical bag material 16 and the double expansion part forming sheet member 18, the injection port member 17 and the double expansion part injection port member 19 It becomes possible to cause the portion inserted inside the filling bag body 11 or the double-inflated portion forming sheet member 18 to function as a check valve. After the filling bag body 11 made of the cylindrical bag material 16 is attached to the outer circumferential surface 20a of the steel shoring 20 via the planar fastener 12, For example, a supply nozzle (not shown) at the tip of a pressure-feeding pipe extending from a pressure-feeding pump for the curable filler 15 is connected, and the curable filler 15 in a fluid state is transferred to a filling bag made of a cylindrical bag material 16. 11 or the inside of the sheet member 18 for forming the double-inflated portion.

In this embodiment, as the curable filler 15 having fluidity, which is supplied and filled inside the filling bag 11 made of the cylindrical bag material 16 and the double expansion part forming sheet member 18, for example, a known contact material is used. A highly fluid and ultra-fast hardening mortar filler similar to the hardenable filler used in the back construction method can be used. It is preferable to use a mortar filler that does not cause breathing, has excellent strength development in a short period of time, and increases strength over a long period of time.

In the present embodiment, for example, in a region close to the face of the tunnel 30, a steel shoring 20 made of H-beam steel is constructed along the excavated inner wall surface 32 of the tunnel 30, for example, as shown in FIG. As shown in 3(a) and (b), the outer fastener face material 14 is attached to and removed from the inner fastener face material 13 on the outer peripheral surface of the outer flange 20a to which the inner fastener face material 13 forming the sheet fastener 12 is attached. It becomes possible to attach the filling bag body 11 to the steel shoring 20 by simply attaching the bag body 11 to the steel shoring 20. Further, as a result, the sheet member 18 for forming a double expansion portion is formed in the portion corresponding to the portion 33 where the amount of excess excavation of the excavated inner wall surface 32 is increased by the cylindrical bag material 16 integrated with the outer fastener face material 14. The filling bag body 11 to which is attached or the filling bag body 11 that does not require the attachment of the double expansion part forming sheet member 18 is placed on the outer circumferential surface 20a of the steel shoring 20 along the circumferential direction thereof. It becomes possible to extend it to a predetermined position and install it smoothly.

Further, the position of the filling bag body 11 can be easily adjusted by engaging and releasing the outer fastener face material 14 to the inner fastener face member 13, and the sheet member 18 for forming the double-inflated portion can be easily adjusted. The filling bag body 11 to which is attached and the filling bag body 11 to which the double expansion part forming sheet member 18 is not attached are extended to predetermined positions along the outer circumferential surface 20a of the steel shoring 20. , it becomes possible to install it smoothly. As a result, in this embodiment, as shown in FIG. 1, for example, the four filling bags 11 are arranged in the region R of 120 degrees in the circumferential direction at the upper part of the tunnel 30, and the inlet member 17 is arranged on the upper end side. , it becomes possible to symmetrically arrange and attach two pieces on the left and right sides with a space between them in the area where the injection port member 17 is placed.

Once the four filling bags 11 are attached to predetermined positions on the outer circumferential surface 20a of the steel shoring 20 via the sheet fasteners 12 formed by the inner fastener face material 13 and the outer fastener face material 14, each filling bag By supplying and filling the body 11 with the hardening filler 15 from the pressure pump through the injection port member 17, the filling bag 11 is expanded and the outer peripheral portion of the filling bag 11 is inserted into the excavation of the tunnel 30. It is brought into close contact with the wall surface 32. Furthermore, regarding the filling bag body 11 in which the double expansion part forming sheet member 18 is attached to the position corresponding to the portion 33 of the excavated inner wall surface 32 where the amount of excess excavation is increased, the double expansion part forming sheet member 18 By supplying the hardening filler 15 from the pressure pump through the double expansion part inlet member 19 to fill the inside of the double expansion part formation sheet member 18, the double expansion part forming sheet member 18 is expanded and the excavation inner wall surface 32 is filled. In the portion 33 where the amount of over-excavation is large, the outer peripheral portion of the double expansion portion forming sheet member 18 can be brought into close contact with the excavated inner wall surface 32 of the tunnel 30.

Therefore, in the mountain tunnel construction method, the steel shoring of this embodiment is installed along the excavated inner wall surface 32 and the excavated inner wall surface 32 of the tunnel 30 having a cross-sectional shape including an arch-shaped portion at the upper part. Through the filling bag 11 installed between the outer circumferential surface of the steel shoring 20 and the outer circumferential surface of the steel shoring 20, the outer circumference of the steel shoring 20 is In this method, a filling bag body 11 is installed by extending in the circumferential direction on the outer circumferential surface of the steel shoring 20 installed along the excavated inner wall surface 32 of the tunnel 30. At the same time, a sheet member 18 for forming a double expansion portion is integrally provided at a position corresponding to the portion 33 where the amount of excess excavation has increased in the outer portion of the attached filling bag body 11, and a steel shoring is installed. 20 is installed along the excavated inner wall surface 32 of the tunnel, the filling bag 11 is expanded by supplying the hardening filler 15 having fluidity to the filling bag 11, and a double expansion part is formed. By supplying the curable filler 15 to the inside of the sheet member 18 for forming the double expansion portion, the sheet member 18 for forming the double expansion portion is expanded, and by curing the curable filler 15 supplied thereto, the expanded double expansion portion is expanded. The outer portion of the expansion portion forming sheet member 18 is brought into close contact with the excavated inner wall surface 32 of the tunnel 30 in the portion 33 where the amount of over-excavation has become large, and from the inside excavated wall surface 32 in the portion 33 where the amount of over-excavation has become large. The steel shoring 20 is designed to support the load.

As a result, according to the close contact structure 10 and close contact method for steel shoring in the mountain tunnel construction method of the present embodiment, the filling bag body 11 can be easily attached to the outer peripheral surface 20a of the steel shoring 20 without much effort. At the same time, the filling bag 11, which expands when the hardening filler 15 is injected and filled, is brought into close contact with the excavation inner wall surface 32 in a stable state, and the excavation inner wall surface 32 and the steel shoring 20 It becomes possible to achieve integration with In particular, the filling bag 11 and the sheet member 18 for forming the double expansion part can be installed in the portion 33 of the excavated inner wall surface 32 of the tunnel 30 where the amount of over-excavation is larger than in other areas, without requiring much effort. Through this, it becomes possible to easily and stably bring the outer circumferential surface 20a of the steel shoring 20 and the excavated inner wall surface 32 into close contact with each other.

Further, according to the present embodiment, the filling bag body 11 is attached to the steel shoring 20 in a planar manner over a wide area via the sheet fastener 12 formed by the inner fastener surface material 13 and the outer fastener surface material 14. Since it is attached to the outer circumferential surface 20a of the filling bag 11 and the sheet member 18 for forming the double-inflated portion, it is inflated and deformed in a stable state without causing positional shift until the filling bag body 11 and the sheet member 18 for forming the double-inflated portion are brought into close contact with the excavated inner wall surface 32. becomes possible. According to this embodiment, the curable filler 15 filled inside the filling bag 11 and the double expansion part forming sheet member 18 is hardened, so that the steel shoring 20 and the tunnel 30 are hardened. It becomes possible to make the steel shoring 20 efficiently support the load from the excavated inner wall surface 32 by strongly integrating it with the excavated inner wall surface 32.

FIG. 6 illustrates another form of the steel shoring close contact structure 10' of the present invention. In the close contact structure 10' of another embodiment shown in FIG. 6, the double expansion part forming sheet member 18' is formed by attaching a cylindrical bag material 18a formed in a cylindrical shape to the outer part of the filling bag body 11. It is provided as an integral part of the. In the other form of close-contact structure shown in FIG. 6, the double expansion part forming sheet member 18' is attached to the outer part of the filling bag body 11, so the curable filler 15 is filled inside the sheet member 18'. By hardening the steel shoring structure, the same effects as those of the steel shoring structure 10 described above can be achieved.

Further, in this embodiment, a sheet member 18' for forming a double-inflated portion made of, for example, a cylindrical bag material 18a is attached to the outer part of the filling bag body 11 so that its position can be adjusted, and the steel shoring 20 is attached to the tunnel 30. After installation along the excavated inner wall surface 32 of the filling bag body 11, the position of the double expansion part forming sheet member 18' in the outer part of the filling bag body 11 is adjusted and the curable filler 15 is supplied. The outer portion can also be brought into close contact with the excavated inner wall surface 32 of the tunnel 30 in the portion 33 where the amount of over-excavation is increased.

Here, for example, the sheet member 18' for forming a double expansion part made of the cylindrical bag material 18a is attached to the outer part of the filling bag body 11 via the clip fastening 21, as shown in FIGS. 7(a) and 7(b). It can be installed in an adjustable position. In addition, the sheet member 18' for forming the double expansion part by the cylindrical bag material 18a is made of a binding band 22 having elasticity, as shown in FIGS. 8(a), (b) and FIGS. , 23, it can be attached to the outer part of the filling bag body 11 in a position-adjustable manner.

For example, by attaching a sheet member 18' for forming a double expansion part made of a cylindrical bag material 18a to the outer part of the filling bag body 11 via a clip fastening 21 or a binding band 22, 23, the position can be adjusted. Compared to the case where the double expansion part forming sheet member 18' is attached via adhesive or the like, for example, breathing water due to the curable filler 15 filled in the cylindrical bag material 18a is Even if it oozes out, the sheet member 18' for forming the double-inflated portion formed by the tubular bag material 18a can be more firmly integrated with the outer portion of the filling bag body 11.

Further, in the present embodiment, the sheet member 18' for forming the double expansion part by, for example, the cylindrical bag material 18a is positioned on the outer side of the filling bag body 11 via the planar fastener 24, as shown in FIG. It can also be installed in an adjustable manner. For example, preferably a large number of An inner zipper face material 25 made of a nonwoven fabric with a loop body erected thereon and having a planar shape in the form of a longitudinal strip is attached to the filling bag body 11 over substantially the entire length thereof, and a double expansion part is formed using the cylindrical bag material 18a. An outer fastener face material 26, preferably made of a non-woven fabric with a large number of loops erected thereon, and having a longitudinal strip-like planar shape, is attached to the bottom surface of the sheet member 18' for use over approximately the entire length of the cylindrical bag material 18a. I'll keep it. A cylindrical bag is formed by attaching the inner zipper surface material 25 and the outer zipper surface material 26 to each other with an intermediate zipper surface material 27 having a large number of loops erected on both sides interposed therebetween. The double expansion part forming sheet member 18' made of the material 18a is attached to the outer part of the filling bag body 11 via the sheet fastener 24 made of the inner fastener face material 25, the outer fastener face material 26, and the intermediate fastener face material 27. It becomes possible to fix and attach it so that the position can be adjusted. The inner zipper face material 25, which is preferably made of non-woven fabric, is sewn around its periphery with an allowance in width in anticipation of the sheet material on the outside of the filling bag body 11 expanding and expanding. It can be attached to the outer part of the body 11.

Furthermore, in the embodiment, as shown in FIG. 11, a plurality of sheet members 18'' for forming a double-inflated portion are attached in a row along the extending direction of the filling bag body 11, and After the shoring 20 is installed along the excavated inner wall surface 32 of the tunnel 30, a position corresponding to the portion 33 where the amount of excess excavation is increased is selected from the plurality of double expansion portion forming sheet members 18''. A curable filler 15 is supplied to the inside of the sheet member 18'' for forming a double expansion part placed in the area, and the outer part of the filling material 15 is used as the inner wall surface of the excavated tunnel 30 in the part 33 where the amount of over-excavation is large. In this way, the outer part of the double expansion part forming sheet member 18'' can be brought into close contact with the excavated inner wall surface 32 of the tunnel 30 in the part 33 where the amount of over-excavation is large. It becomes possible to make it come in close contact with the

In FIG. 11, a plurality of consecutively arranged double-inflatable portion forming sheet members 18'' extend over a considerable length region of the filling bag 11, with the longitudinal direction along the extending direction of the filling bag 11, for example. The inner part of the sheet member 18 for forming the double expansion part, which is integrally provided on the outer part of the sheet member 18 and has a planar shape in the form of a longitudinally elongated band, is divided into a plurality of regions in the longitudinal direction by sewing or the like. As a result, the double expansion part can be formed until the outer part of the double expansion part forming sheet member 18'' is brought into close contact with the excavated inner wall surface 32 of the tunnel 30 in the portion 33 where the amount of overextension is increased. It becomes possible to effectively improve the stability of the forming sheet member 18''. It is also possible to integrally provide the outer portion of the filling bag body 11 by attaching the double expansion part forming sheet members 18 in series along the extending direction.

Note that the present invention is not limited to the above-described embodiments, and various modifications can be made. For example, the sheet member for forming the double expansion part does not necessarily have to be integrally provided on the outer part of the filling bag body with its longitudinal direction along the extending direction of the filling bag body, but as shown in FIG. In addition, it is integrally provided on the outer part of the filling bag body, with the longitudinal direction being a direction that intersects with the extending direction of the filling bag body 11, preferably along a direction that intersects perpendicularly to the extending direction of the filling bag body 11. It's okay to be left behind.

10,10' Adhesive structure of steel shoring (adhesive structure)
11, 11' Filling bag body 12 Plane fastener 13 Inner fastener surface material (male side fastener material)
13a Base sheet 14 Outer fastener surface material (female side fastener material)
14a Base sheet 15 Curable filler 16 Cylindrical bag material 16a Bottom portion 16b Expandable portion 17 Inlet member 17a Inlet 18, 18', 18'' Double expansion part forming sheet member 19 Double expansion part inlet member 19a Inlet 20 Steel shoring 20a Outer flange (outer peripheral surface)
21 Clip fastenings 22, 23 Binding band 24 Plane fastener 25 Inner fastener face material 26 Outer fastener face material 27 Intermediate fastener face material 30 Tunnel 31 Top portion 32 Excavation inner wall surface X Tunnel excavation direction (excavation direction)
Y Circumferential direction of steel shoring (circumferential direction)
R: 120° circumferential area at the top of the tunnel

Claims (6)

In the mountain tunnel construction method, a filling bag is installed between the excavated inner wall surface of a tunnel having a cross-sectional shape including an arch-shaped portion at the upper part and the outer peripheral surface of a steel shoring installed along the excavated inner wall surface. A close contact structure of the steel shoring in which the outer circumferential surface of the steel shoring and the excavated inner wall surface are brought into close contact with the excavated inner wall surface in a portion of the excavated inner wall surface where the amount of over-excavation is larger than in other areas, ,
A sheet for forming a double expansion portion is placed at a position corresponding to the portion where the amount of excess excavation is increased in the outer portion of the filling bag body that is attached to the outer circumferential surface of the steel shoring so as to extend in the circumferential direction. The parts are installed as one piece,
The sheet member for forming a double expansion part is integrally provided on the outer part of the filling bag by attaching a cylindrical bag material formed in a cylindrical shape, and the sheet member for forming a double expansion part The member is attached to the outer part of the filling bag body via a clip, via an elastic bandage, or via a hook-and-loop fastener in a position-adjustable manner,
By supplying a curable filler having fluidity to the filling bag body, the filling bag body is expanded, and by supplying a curable filler material to the inside of the double expansion part forming sheet member, the double expansion part is expanded. By expanding the sheet member for forming a double expansion part and hardening the curable filler supplied thereto, the outer portion of the expanded sheet member for forming a double expansion part becomes larger in the amount of excess excavation. Steel shoring in a mountain tunnel construction method, in which the steel shoring is in close contact with the excavated inner wall surface of the tunnel in the part where the excess excavation amount is large, and the steel shoring supports the load from the excavated inner wall surface. close contact structure. The filling bag body is integrally attached to the outside of an outer fastener face material forming a sheet fastener, and an inner fastener face material forming a sheet fastener is integrally attached to the outer peripheral surface of the steel shoring. Claim: wherein the filling bag body is attached at a predetermined position in the circumferential direction of the steel shoring by engaging the outer fastener face member with the inner fastener face member. The close contact structure of steel shoring in the mountain tunnel construction method described in 1. The double expansion portion forming sheet member has a planar shape in the form of a vertically elongated band, and is integrally provided on the outer side of the filling bag body with its longitudinal direction along the extending direction of the filling bag body. The close contact structure of steel shoring in the mountain tunnel construction method according to claim 1 or 2 . The sheet member for forming the double expansion part has a planar shape in the form of a longitudinally elongated band, and is integrated with the outer portion of the filling bag body with its longitudinal direction along the direction intersecting the extending direction of the filling bag body. The close contact structure of steel shoring in the mountain tunnel construction method according to claim 1 or 2, which is provided as a. A plurality of the sheet members for forming the double-inflated portion are attached in a row along the extending direction of the filling bag, and a plurality of sheet members for forming the double-inflated portion are selected from the plurality of sheet members for forming the double-inflated portion. In addition, a curable filler is supplied to the inside of the sheet member for forming the double expansion portion, which is arranged in a portion corresponding to the portion where the amount of excess excavation is increased, and the outer portion of the filler is The close contact structure of the steel shoring in the mountain tunnel construction method according to any one of claims 1 to 4, which is in close contact with the excavated inner wall surface of the tunnel in the portion where the excavation amount is increased. In the mountain tunnel construction method, a filling bag is installed between the excavated inner wall surface of a tunnel having a cross-sectional shape including an arch-shaped portion at the upper part and the outer peripheral surface of a steel shoring installed along the excavated inner wall surface. A steel shoring adhesion method in which the outer circumferential surface of the steel shoring and the excavated inner wall surface are brought into close contact with the excavated inner wall surface in a portion where the amount of over-excavation is larger than other areas of the excavated inner wall surface, ,
The filling bag body is attached to the outer circumferential surface of the steel shoring installed along the inner wall surface of the excavated tunnel, and the filling bag body is attached so as to extend in the circumferential direction. A sheet member for forming a double expansion part is integrally provided at a position corresponding to the part where the amount of excavation has increased,
While the steel shoring is installed along the inner wall surface of the tunnel excavation, the filling bag is expanded by supplying a hardening filler having fluidity to the filling bag, and the double By supplying a curable filler to the inside of the sheet member for forming an expansion portion, the sheet member for forming a double expansion portion is expanded, and by curing the curable filler supplied thereto, the expanded double expansion portion is cured. The outer portion of the sheet member for forming the heavy expansion section is brought into close contact with the excavated inner wall surface of the tunnel in the portion where the amount of extra excavation has increased, and the load from the inner wall surface of the excavation is applied to the portion where the amount of extra excavation has become large. is supported by the steel shoring,
The sheet member for forming the double expansion part is attached to the outer part of the filling bag so that its position can be adjusted, and after the steel shoring is installed along the inner wall surface of the tunnel excavation, the filling bag is By adjusting the position of the double expansion part forming sheet member in the outer part of the body and supplying the curable filler to the inner side, the outer part of this is made into a tunnel in the part where the amount of overextension is large. A method of adhering steel shoring to the inside wall of an excavated tunnel in mountain tunnel construction.

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