JP2013087514A - Movable type form device, and construction method of lining concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quality of lining concrete and to improve efficiency of construction.SOLUTION: A movable type form device 1 includes a portal movable carriage 4 capable of traveling on a bottom surface 3 of a tunnel in a tunnel axial direction, and an arch-shaped form 5 arranged so as to cover the carriage 4 from the upper part and capable of being expanded/reduced in diameter. The form 5 has a two-layer structure comprising a wall 52 connected to the carriage 4 through jacks 55-57, and a panel form 53 detachably attached thereto. The panel form 53 forms a space S for placing concrete with a tunnel inner peripheral surface when expanded. The panel form 53 is supported by the carriage 4 through the wall 52 and supports the concrete inside the space S when mounted on the wall 52. Also, the panel form 53 is placed at a position where the concrete is placed and protects the concrete at the position when detached from the wall 52.

Description

  The present invention relates to a movable formwork apparatus used for placing concrete on the inner peripheral surface of a tunnel, and a method for constructing lining concrete on the inner peripheral surface of a tunnel using this apparatus.

  For example, in the construction of a shield tunnel, a cylindrical primary lining body is constructed by excavating a natural ground with a shield machine and assembling an arc segment behind it. After excavation by the shield excavator is completed, a cylindrical formwork is installed along the inner peripheral surface of the primary lining body, and the space between the formwork and the primary lining body is installed. By placing concrete, lining concrete as a secondary lining body is constructed.

As a cylindrical formwork used for construction of this lining concrete, for example, a telescopic type circular steel foam described in Patent Document 1 can be cited.
This type of circular steel foam includes an upper foam constituting the top, side foams on both sides, and an inverted foam on the bottom. Moreover, a rail is laid on the invert form in the circular steel foam, and a portal-type movable carriage runs on the rail. This movable carriage can be mounted with an arch-shaped foam composed of an upper foam and a side foam reduced in diameter. Further, the movable carriage can travel in the tunnel steel direction in a circular steel foam by mounting an arch-shaped foam in a reduced diameter state during the demolding movement. Further, I-steel is provided on the inner surface of the upper central portion of the movable carriage, and an electric lifting device is suspended from this I-steel. This electric lifting device can be lifted with the inverted form folded. In addition, the electric hoisting device can travel in the direction of the tunnel axis through the I-steel through the I-steel with the inverted form folded when the mold is moved.

  On the other hand, in the construction of mountain tunnels, for example, when performing construction using the NATM method, first, spray concrete is sprayed as the primary lining on the inner peripheral surface of the tunnel formed by blasting excavation, etc. Accordingly, a waterproof sheet is installed, and as the secondary lining, lining concrete is constructed using an arch-shaped formwork having an outer peripheral surface facing the inner peripheral surface of the tunnel.

As a formwork used for construction of this lining concrete, the telescopic formwork (teleform) of patent documents 2 can be mentioned, for example.
This type of telescopic formwork has an arch-shaped cross-sectional shape, and the arch-shaped cross-section can be expanded and contracted. In addition, rails are laid on the bottom of the tunnel, and a gate-type movable carriage runs on the rails. This movable carriage can be mounted with the arch-shaped formwork being reduced in diameter. In addition, the movable carriage can be mounted in the reduced-diameter arch-shaped form during the demolding movement and can travel in the tunnel axis direction in the other arch-shaped form in the unfolded state.

  Patent Document 2 describes that supporting concrete is built in advance on both sides of the tunnel bottom before construction of the lining concrete. This supporting concrete is fixed to the ground by anchors. And at the time of construction of lining concrete, the both ends of an arch-shaped formwork are each fixed to support concrete with a volt | bolt. As a result, the arch-shaped formwork is firmly supported by the ground via bolts, supporting concrete and anchors at both ends, and acts when lining concrete is constructed (especially when placing concrete). To support the pressure of concrete.

JP 58-113499 A JP 2008-308855 A

Since the circular steel foam described in Patent Document 1 has a closed loop structure (annular structure) and a stable structure, it can favorably support concrete placing pressure and the like.
However, in this circular steel foam, when the mold is moved, the electric lifting device lifts the inverted foam in a folded state and moves in the gate-shaped movable carriage. For this reason, the passage of a work vehicle or the like in a portal-type movable carriage has been extremely restricted.

  Moreover, the arch-shaped form described in Patent Document 2 has an open loop structure with an open bottom. Therefore, in order to support the concrete placing pressure and the like with the arch-shaped formwork, it is necessary to construct the supporting concrete in advance on both sides of the tunnel bottom before constructing the lining concrete. For this reason, since the construction process of supporting concrete is incorporated at the time of construction of lining concrete, work man-hours increase. Further, after the construction of the lining concrete, it may be necessary to remove the supporting concrete and the like, which may increase the number of work steps and may require disposal of industrial waste.

Moreover, since it is necessary to be able to endure the pressure at the time of concrete placement with an arch shape with an arch-shaped formwork, it is inevitable that the teleform is enlarged.
Furthermore, in order to construct high-quality lining concrete, it is important to maintain the temperature and humidity conditions necessary for hardening the concrete by sufficiently curing the cast concrete with a formwork. It is also important to avoid external influences.

  In view of such a situation, an object of the present invention is to improve the efficiency of construction of lining concrete and to improve the quality of lining concrete.

  Therefore, the mobile formwork apparatus according to the present invention is a formwork apparatus used for placing concrete on the inner peripheral surface of the tunnel, and a portal-type movable carriage capable of traveling in the tunnel axial direction on the bottom surface of the tunnel, The movable carriage is arranged so as to cover from above, and has an outer peripheral surface facing the inner peripheral surface of the tunnel, and an arch-shaped formwork that can be expanded and contracted. The formwork is composed of an arch-shaped wall that is arranged on the inner side in the tunnel radial direction and connected to the moving carriage, and an arch-shaped panel foam that is arranged on the outer side in the tunnel radial direction and is detachably attached to the wall. It has a layer structure. When the panel foam is unfolded, it forms a space for placing concrete between the inner peripheral surface of the tunnel. When the panel foam is mounted on a wall, the panel foam is supported by a movable carriage through the wall, When the concrete placed on the wall is supported and separated from the wall, the concrete is placed at the place where the concrete is placed to protect the concrete at this position.

  Moreover, the construction method of the lining concrete which concerns on this invention WHEREIN: When constructing lining concrete by placing concrete on the inner peripheral surface of a tunnel using the said movable formwork apparatus, first, it is 1st to a wall. The formwork is developed with the panel form mounted, and concrete is placed in the space. Thereafter, after the predetermined period has passed, the wall is detached from the first panel foam and reduced in diameter while maintaining the unfolded state of the first panel foam, and the first panel foam is placed at the concrete placement position. To cure concrete. Next, the mobile formwork apparatus is moved backward from the deployed position of the first panel form to the deployed position of the second panel form that has been cured in the rearward direction of the tunnel lining. Next, the wall of the reverse movable formwork apparatus is developed and the second panel form is mounted on the wall. Next, the diameter of the mold is reduced with the second panel form mounted on the wall. Then, the movable formwork apparatus having a reduced diameter is advanced in the tunnel lining progress direction, passed through the first panel foam, and the concrete is placed in front of the first panel foam in the tunnel lining progress direction. Move to position.

  According to the present invention, when the panel foam is mounted on a wall, the panel foam is supported by the movable carriage through the wall and supports the concrete placed in the space. As a result, for example, the concrete placement pressure and the weight of the concrete with insufficient strength (compression strength) immediately after placement are supported by the panel form, wall, and movable carriage. It is possible to support the formwork without constructing the supporting concrete as described above and fixing it with bolts or the like. In other words, there is no need to construct support concrete to support the formwork in advance, or to fix the formwork and support concrete via bolts, so construction efficiency is improved when constructing lining concrete. can do.

  Further, according to the present invention, when the panel foam is separated from the wall, the panel foam is placed at a position where the concrete is placed and protects the concrete at this position. Thereby, for example, the concrete that has reached the strength that can stand on its own after a predetermined period of time has been protected by the panel foam that has been placed, so the mobile formwork apparatus including the wall detached from the panel foam, Preparation for the next concrete placement work can be started, and therefore, the construction efficiency can be improved when the lining concrete is constructed. Moreover, about the concrete which reached the intensity | strength which can be self-supported, since curing | curing is fully continued by the existing panel form, the quality improvement of lining concrete can be implement | achieved.

Here, the protection and curing of the concrete in the present invention means that the exposure of the surface of the placed concrete to the outside is suppressed.
In general, even when the concrete is strong enough to be self-supporting, the strength is not sufficient, and therefore, distortion or peeling off of the concrete surface may occur during demolding.

  Protecting and curing the concrete as a countermeasure can reduce the water evaporated from the concrete surface and reduce the temperature difference between the concrete surface and the interior. Generation | occurrence | production of surface peeling etc. can be suppressed and by extension, quality improvement of lining concrete can be implement | achieved.

The figure which shows schematic structure of the mobile formwork apparatus in one Embodiment of this invention. Partial enlarged view of part P in FIG. Partial sectional view of the AA cross section and the BB cross section of FIG. Diagram showing how to construct lining concrete The figure which shows the operating state of a mobile formwork apparatus The figure which shows the operating state of a mobile formwork apparatus

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration of a mobile formwork apparatus according to an embodiment of the present invention. Note that the left and right halves in FIG. 1 each show a cross section at a different position in the tunnel axis direction of the movable mold apparatus.

The mobile formwork apparatus 1 is arranged in a mine of a mountain tunnel that is primarily lined with shotcrete 2.
The mobile formwork apparatus 1 includes a portal-type mobile carriage (gantry) 4 capable of traveling on the bottom surface 3 of a tunnel in the tunnel axial direction, and an arch-shaped formwork arranged so as to cover the gantry 4 from above. 5.

  The gantry 4 has a predetermined length in the tunnel axis direction, and moves on the rail 42 laid on the tunnel bottom surface 3 at the lower end of the leg portion 41 at the front and rear ends (ends in the tunnel axis direction). A self-propelled device 43 is provided. Here, the rail 42 extends in a predetermined length in the tunnel axis direction. In this embodiment, the gantry 4 travels by the self-propelled device 43, but the travel mode is not limited to this. For example, the gantry 4 is configured to be pulled by a traction device such as an electric winch. May be.

  In addition, an auxiliary jack 45 is provided at the lower end of each of the plurality of leg portions 44 located in the middle of the tunnel axis direction of the gantry 4. The auxiliary jack 45 limits the movement of the gantry 4 when the gantry 4 is stopped.

An internal space 46 is formed inside the gantry 4 so that a work vehicle (for example, a projecting truck) can easily pass in the tunnel axial direction.
The gantry 4 is provided with a wind pipe 47 for blowing air, a continuous bellcon device (not shown) for carrying out tunnel excavation, and a work scaffold (not shown). In this embodiment, the continuous bell-con device is installed, but the continuous bell-con device may not be installed. The work scaffold is used at the time of placing concrete or at the time of attaching / detaching a panel foam described later.

  In addition, the gantry 4 is provided with piping (not shown) for pumping concrete for lining, and the leading end portions of these piping are respectively provided in the casting holes (see FIG. (Not shown).

The formwork 5 (panel form 53 described later) forms a space S for placing concrete between the inner peripheral surface (tunnel inner peripheral surface) of the shotcrete 2.
The mold 5 has one span (for example, 10.5 m) by connecting a plurality of (for example, seven) arch-shaped mold members 51 having a predetermined width (for example, 1.5 m width) in the tunnel axis direction. It is configured as. The width of the formwork member 51 is not limited to this. Further, the number of mold members 51 per span of the mold 5 is not limited to this.

  The formwork member 51 is disposed on the inner side in the tunnel radial direction and connected to the gantry 4, and the arched panel form 53 is disposed on the outer side in the tunnel radial direction and is detachably attached to the wall 52. And a two-layer structure.

The wall 52 is formed so that its shape follows the shape of the tunnel lining through the panel form 53.
The wall 52 is pivotally supported by a top end wall 52a located at the top, a side wall 52b pivotally supported by both ends of the top end wall 52a via a hinge mechanism, and a lower end of the side wall 52b via a hinge mechanism. A lower end wall 52c. In other words, the wall 52 is divided into five small forms (one top wall 52a, two side walls 52b, and two bottom walls 52c) in series in the circumferential direction of the tunnel. They are connected to each other via a hinge mechanism. In the present embodiment, the wall 52 is divided into five small walls in series in the tunnel circumferential direction. However, the number of divisions is not limited to this, and the wall 52 is five or more in series in the tunnel circumferential direction. It is preferable to be divided into small walls.

  The top end wall 52a, the side wall 52b, and the lower end wall 52c each have an H-shaped cross section and extend in the circumferential direction of the tunnel and are made of an arcuate steel material 52d having a predetermined length (see FIG. 3). It is.

  The top wall 52a is supported by a plurality of jacks 55 provided on the top of the gantry 4 in the tunnel axis direction so as to be movable up and down. Therefore, the top end wall 52 a is connected to the gantry 4 via the jack 55.

  The side wall 52b and the lower end wall 52c are connected to jacks 56 and 57 provided on the legs 41 and 44 of the gantry 4, respectively, and are moved in and out of the tunnel by expansion and contraction of these jacks. Therefore, the side wall 52 b and the lower end wall 52 c are connected to the gantry 4 via the jacks 56 and 57.

Therefore, the wall 52 can be expanded and contracted by expansion and contraction of the jacks 55 to 57.
The jack 57 is detachably attached to the leg portions 41 and 44 of the gantry 4 and the lower end wall 52c. Thus, when the degree of diameter reduction of the wall 52 is large, the jack 57 is removed and the lower end wall 52c is lifted by a chain block or the like (not shown) to the tunnel bottom surface 3 of the lower end panel form 53c attached to the lower end wall 52c. Can be suppressed.

  The panel form 53 includes a top end panel form 53a located at the top, a side panel form 53b pivotally supported on both ends of the top end panel form 53a via a hinge mechanism, and a lower end of the side panel form 53b via a hinge mechanism. And a lower end panel form 53c pivotally supported. In other words, the panel form 53 is divided into five small forms (one top panel form 53a, two side panel forms 53b, and two bottom panel forms 53c) in series in the circumferential direction of the tunnel, Adjacent small foams are connected to each other via a hinge mechanism. In the present embodiment, the panel foam 53 is divided into five small foams in series in the tunnel circumferential direction, but the number of divisions is not limited to this, and the panel foam 53 is 5 in series in the tunnel circumferential direction. Preferably it is divided into two or more small forms.

  The top end panel form 53a, the side panel form 53b, and the lower end panel form 53c are each configured by connecting a plurality of panel form members 53d in an arch shape in the tunnel circumferential direction.

  The panel foam member 53d is a box-shaped steel foam having an arch shape that matches the shape of the corresponding wall 52 and closing on the side facing the inner peripheral surface of the tunnel. Strength reinforcing ribs 53e (see FIG. 2) extending in the axial direction are provided.

  In the present embodiment, the top panel form 53a has twelve panel form members 53d connected in an arch shape in the circumferential direction of the tunnel. Adjacent panel form members 53d are fixed to each other by, for example, bolt fastening. Here, the top panel form 53a is composed of twelve panel form members 53d, and the adjacent panel form members 53d are adjacent to each other by being joined by frictional bonding using an attachment plate (not shown). The positional relationship between the panel foam members 53d to be adjusted can be adjusted, and the curvature of the outer peripheral surface of the top panel form 53a facing the inner peripheral surface of the tunnel can be adjusted. Therefore, the panel form 53 can maintain its shape with a certain strength. In other words, the panel form 53 has a certain shape holding force.

  Similar to the top panel form 53a, in this embodiment, the side panel form 53b is configured by eight panel form members 53d, and the lower end panel form 53c is configured by two panel form members 53d. Therefore, by adjusting the positional relationship between the adjacent panel foam members 53d, the curvature of the outer peripheral surface of the side panel foam 53b facing the inner peripheral surface of the tunnel and the curvature of the outer peripheral surface of the lower end panel foam 53c are adjusted. And can be done.

  The top end panel form 53a, the side panel form 53b, and the lower end panel form 53c are detachably attached to the top end wall 52a, the side wall 52b, and the lower end wall 53c, respectively, using metal fittings such as non-illustrated stopper pins. .

  The top wall 52a can support and mount 12 panel foam members 53d, the side wall 52b can mount and support 8 panel foam members 53d, and the bottom wall 52c can mount and support two panel foam members 53d. Yes.

The number of panel foam members 53d attached to each wall 52a, 52b, 52c is not limited to the above number.
Here, the connection relationship of the top end panel form 53a, the side panel form 53b, the top end wall 52a, and the side wall 52b will be described with reference to FIGS.

  2 shows a portion P of FIG. 1, and FIG. 2A shows a state in which the panel foam 53 is attached to the wall 52, while FIG. It shows the state (separated state) that has been detached from. FIG. 3A shows a partial cross section of the AA cross section of FIG. 2, and includes a hinge mechanism 61 that connects the top panel form 53a and the side panel form 53b, a top wall 52a, and a side wall 52b. And a hinge mechanism 62 for connecting the two. FIG. 3B shows a partial cross section of the BB cross section of FIG. 2, and shows a hinge mechanism 63 that connects the top end panel form 53a and the top end wall 52a.

  The hinge mechanism 61 that connects the top panel form 53a and the side panel form 53b is installed at a predetermined position shifted in the tunnel axis direction from the center part of the steel material 52d in the tunnel axis direction. The hinge mechanism 61 includes a pair of plates 61a projecting inward in the tunnel radial direction from the lower end portion of the top panel form 53a, and an inner portion in the tunnel radial direction from the upper end portion of the side panel foam 53b so as to be interposed therebetween. Plate 61b projecting toward the direction, and panel foam hinge pin 61d mounted in a through hole 61c formed in the overlap region of these plates 61a and 61b in advance.

  The hinge mechanism 62 for connecting the top end wall 52a and the side wall 52b is installed at the upper part of the center part in the tunnel axial direction of the steel material 52d, and projects outward from the lower end part of the top end wall 52a in the tunnel radial direction. A pair of plates 62a, a plate 62b projecting outward from the upper end of the side foam 53b so as to be interposed therebetween, and an overlap region of these plates 62a and 62b. It is comprised by the wall hinge pin 62d with which the through-hole 62c is mounted | worn.

  Here, the hinge mechanisms 61 and 62 are arranged so that the longitudinal direction of the wall hinge pin 62d coincides with the longitudinal extension line C of the panel foam hinge pin 61d in a state where the panel foam 53 is mounted on the wall 52. Each is arranged. Thereby, in a state where the panel form 53 is mounted on the wall 52, the mold member 51 (form frame 5) can be favorably bent via the hinge mechanisms 61 and 62.

  The hinge mechanism 63 for connecting the top panel form 53a and the top wall 52a is installed at the upper part of the center part in the tunnel axial direction of the steel material 52d, and is interposed between the pair of plates 62a described above. A plate 63b protruding from the rib 53e of the top end panel foam 53a toward the inner side in the tunnel radial direction, and a panel foam fixing pin 63d mounted in a through-hole 63c formed in an overlapping region of these plates 62a and 63b. It is comprised by.

  Here, in a state where the panel form 53 is mounted on the wall 52, the through hole 63c of the hinge mechanism 63 is formed so as to be separated from the through hole 62c of the hinge mechanism 62 in the tunnel circumferential direction and the tunnel radial direction. ing. Further, the plate 63b and the plate 62b do not come in contact between the pair of plates 62a. Therefore, the connection between the top end panel form 53 a and the top end wall 52 a in the hinge mechanism 63 does not affect the bending operation of the wall 52 in the hinge mechanism 62.

  Thus, when the panel form 53 is attached to the wall 52 and integrated, the panel form 53 can be expanded and contracted via the wall 52 by expansion and contraction of the jacks 55 to 57. .

  When the panel form fixing pin 63d is removed in the hinge mechanism 63 and the top wall 52a is lowered by the jack 55, the plates 62a and 63b of the hinge mechanism 63 are separated from each other as shown in FIG. .

  Returning to FIG. 1, when the panel foam 53 is deployed in a state where it is mounted on the wall 52, the panel foam 53 is for placing concrete between the inner peripheral surface (tunnel inner peripheral surface) of the shotcrete 2. The space S is formed.

  When concrete is placed in the space S, the concrete is supported by the panel form 53, the wall 52, and the gantry 4. In other words, the panel form 53 is supported by the gantry 4 through the wall 52 and supports the concrete in the space S.

  When the panel form 53 is detached from the wall 52 while maintaining the unfolded state of the panel form 53 after a predetermined period of time has passed since the concrete is placed, the panel form 53 is positioned at the position where the concrete is placed (concrete The concrete placed in the placement position) and placed in the space S is protected. Here, the above-mentioned predetermined period is a period until the placed concrete reaches a strength (compression strength) that can withstand its own weight or a load applied during construction (in other words, the placed concrete is It is a period until reaching a self-supporting strength), and is set in advance in consideration of the tunnel size, shape, lining thickness, construction conditions such as environmental temperature and humidity, concrete components, and the like.

  As a concrete formwork, steel panel foam, wooden panel, etc. are generally used. When concrete is cast using these molds, when a certain period of time elapses, an adhesion force is generated between the hardened concrete and the molds so as to adhere the molds. Due to this adhesion, these molds adhere to the concrete. Further, as described above, the panel form 53 of the present embodiment has a certain shape holding force. Therefore, even if the supporting means (in this embodiment, the wall 52) is detached after the placed concrete has a strength capable of supporting itself, the panel form 53 can be placed at the concrete placing position.

Next, the construction method of the lining concrete using the mobile formwork apparatus 1 is demonstrated using FIGS.
FIG. 4 schematically shows a method for constructing lining concrete. 5 and 6 show the operating state of the mobile formwork apparatus during construction of the lining concrete. Here, the tunnel lining progress direction corresponds to the tunnel axis direction.

  In FIG. 4, one rectangular grid corresponds to a region of one span of the mold 5 on the inner peripheral surface of the tunnel (that is, seven areas of the mold member 51). The rectangular grid indicated by the alternate long and short dash line is an area where construction of the lining concrete has been completed. A rectangular grid indicated by a solid line is an area where a panel form of one span (one continuous) exists. A rectangular grid indicated by a double solid line is an area where there is a movable formwork apparatus including a panel form and a wall for one span (one continuous). The rectangular grids indicated by broken lines are areas where construction of the lining concrete has not yet started. The area indicated by the relatively rough dodd is the area where the curing of the concrete has been completed. A region indicated by relatively dense dots is a region where concrete is cured. The area indicated by diagonal lines is an area where concrete is placed or an area where a predetermined period of time has not passed since concrete is placed.

  Each span shown in FIG. 4 (A) will be described in order in the tunnel lining progress direction. In spans 1 and 2, the curing of the concrete is completed, the demolding is completed, and the construction of the lining concrete is completed. Yes. In the span 3, the concrete is cured by a series of panel foams (second panel foams) 102 that are placed at the position where the concrete is placed. In the span 4, the mobile formwork apparatus 1 in an unfolded state including one panel form (first panel form) 101 is disposed. And the panel form 101 forms the space S for concrete placement between the inner peripheral surface (tunnel inner peripheral surface) of the shotcrete 2, and concrete is cast in this space S (FIG. 5). (See (a)). In spans 5 to 8, construction of lining concrete has not yet started.

  When the above-described predetermined period has elapsed after the concrete placement in the span 4 is completed, as shown in FIG. 4 (B), the span 52 maintains the expanded state of the panel form 101 while the wall 52 is placed in the panel form. The concrete is cured at this position by separating from 101 and reducing the diameter, and placing the panel foam 101 at the concrete placement position (see FIG. 5 (a)). Then, the mobile formwork apparatus 1 including the wall 52 in the reduced diameter state is expanded from the span 4 (the expanded position of the panel form 101) to the expanded position of the panel form 102 which has been cured in the rearward direction of the tunnel lining. Reverse to (Span 3). Thereafter, the wall 52 is expanded and the panel form 102 is attached to the wall 52, and the wall 52 and the panel form 102 are reduced in diameter in this attached state (see FIG. 6C). In this way, demolding is performed in the span 3.

  After the demolding, the movable mold apparatus 1 including the panel form 102 in a reduced diameter state is advanced in the tunnel lining progressing direction and passed through the panel form 101 of the span 4 (see FIG. 6D). 4), as shown in FIG. 4C, the panel is moved from the panel form 101 (span 4) to the concrete placement position (span 5) in the forward direction of the tunnel lining.

Then, as shown in FIG. 4 (D), in the span 5, the panel form 102 is placed between the inner peripheral surface (tunnel inner peripheral surface) of the shotcrete 2 as in FIG. 4 (A) described above. A concrete placement space S is formed, and concrete is placed in the space S.
By repeating the above steps, the construction of the lining concrete can be advanced in the tunnel lining direction.

  According to this embodiment, the mobile formwork apparatus 1 is arranged so as to cover the gantry 4 from above and a portal-type mobile carriage (gantry) 4 that can travel on the tunnel bottom surface 3 in the tunnel axial direction. And an arch-shaped form 5 that has an outer peripheral surface facing the inner peripheral surface of the tunnel and can be expanded and contracted. The mold 5 includes an arch-shaped wall 52 disposed on the inner side in the tunnel radial direction and connected to the gantry 4, and an arch-shaped panel form 53 disposed on the outer side in the tunnel radial direction and detachably attached to the wall 52. Have a two-layer structure. When the panel form 53 is deployed, a space S for concrete placement is formed between the panel form 53 and the inner peripheral surface of the tunnel. When the panel form 53 is mounted on the wall 52, the panel form 53 is supported by the gantry 4 through the wall 52. The concrete placed in the space S is supported. As a result, for example, the concrete placement pressure and the weight of the concrete with insufficient strength (compression strength) immediately after placement are supported by the panel form 53, the wall 52, and the gantry 4, so that Patent Document 2 It is possible to support the mold 5 without constructing the supporting concrete as described in 1 and fixing it with bolts or the like. That is, it is not necessary to construct support concrete for supporting the formwork 5 in advance or to fix the formwork 5 and the support concrete via bolts, so that the construction efficiency at the time of construction of the lining concrete is improved. Can be realized.

  Further, according to the present embodiment, when the panel form 53 is detached from the wall 52, the panel form 53 is placed at a position where the concrete is placed and protects the concrete at this position. As a result, for example, concrete that has reached a strength that allows it to stand on its own after a predetermined period of time has been protected by the panel form 53 that has been placed, so that the movable formwork including the wall 52 separated from the panel form 53 is provided. The apparatus 1 can begin preparation for the next concrete placing operation, and therefore, it is possible to realize the construction efficiency improvement when constructing the lining concrete. Moreover, about the concrete which reached the intensity | strength which can be self-supported, since curing | curing is fully continued by the existing panel form 53, the quality improvement of lining concrete can be implement | achieved.

  Further, according to the present embodiment, the panel foam 53 is constituted by a plurality of panel foam members 53 d connected in the circumferential direction of the tunnel, and these panel foam members 53 d are detachably attached to the wall 52. Thereby, by adjusting the positional relationship between the adjacent panel foam members 53d, the curvature of the outer peripheral surface of the panel foam 53 facing the inner peripheral surface of the tunnel can be adjusted. It can be adjusted flexibly.

  According to the present embodiment, the mold 5 has a two-layer structure including the wall 52 and the panel form 102, and the diameter of the mold 5 is reduced with the panel form 102 mounted on the wall 52. In addition, the mobile formwork apparatus 1 having a reduced diameter passes through another panel form 101 that is self-supporting. This two-layer structure reduces the thickness in the tunnel radial direction of the formwork (foam) placed for concrete protection as compared with the telescopic formwork as described in Patent Document 2. The interior space of the formwork that is placed in is widened. As a result, it is possible to improve the work freedom when constructing the lining concrete.

  According to this embodiment, the panel form 53 is divided into at least five small forms (one top panel form 53a, two side panel forms 53b, and two bottom panel forms 53c) in series in the tunnel circumferential direction. Then, adjacent small forms are connected to each other via a hinge mechanism (for example, the hinge mechanism 61). Thereby, since the panel form 53 becomes a multi-joint type, the expansion | deployment and diameter reduction of the panel form 53 can be performed favorably also at the time of construction of the lining concrete in a large section tunnel.

  Further, according to the present embodiment, the wall 52 is divided into at least five small walls (one top wall 52a, two side walls 52b, and two lower walls 52c) in series in the tunnel circumferential direction. Adjacent small walls are connected to each other via a hinge mechanism (for example, the hinge mechanism 62). Thereby, since the wall 52 becomes an articulated type, even when the lining concrete is constructed in the large cross-section tunnel, the wall 52 can be developed and reduced in size.

  Further, according to the present embodiment, in the state where the panel foam 53 is mounted on the wall 52, the longitudinal extension of the panel foam hinge pin (for example, the panel foam hinge pin 61d) constituting the hinge mechanism for connecting the small foams to each other. The longitudinal direction of the wall hinge pin (for example, the wall hinge pin 62d) constituting the hinge mechanism for connecting the small walls to the line coincides with the line. Thereby, in a state where the panel foam 53 is mounted on the wall 52, for example, the panel foam hinge pin 61d and the wall hinge pin 62d are aligned in a straight line, and therefore the mold 5 is bent well with the straight line as a bending center. Can do.

  In this embodiment, the construction method of the lining concrete has been described using an example in which two panel forms 101 and 102 are alternately advanced in the tunnel lining progressing direction. For example, three panel forms may be alternately advanced in the tunnel lining direction. In this case, of the three panel forms, one panel form is used for concrete placement, and the remaining two panel forms are used for concrete curing. Since it can be made longer than the form, it is possible to realize further quality improvement of the lining concrete. Furthermore, if it is necessary to keep the formwork for a certain period after the period when the concrete is strong enough to ensure the quality of the lining concrete, multiple panel foams can be moved by a moving carriage. By using it, the work period can be shortened.

  Further, in the present embodiment, the construction method of the lining concrete in the mountain tunnel has been described, but the form of the tunnel is not limited to this, and for example, in the shield tunnel, the mobile type is used after the construction of the primary lining body by the segment. It is possible to construct the lining concrete using the frame device 1.

1 Mobile formwork device 2 Shotcrete 3 Tunnel bottom 4 Gantry (moving cart)
5 Form 41 Leg 42 Rail 43 Self-propelled device 44 Leg 45 Auxiliary jack 46 Internal space 47 Wind pipe 51 Formwork member 52 Wall 52a Top wall 52b Side wall 52c Lower wall 52d Steel 53 Panel form 53a Top panel form 53b Side panel form 53c Lower end panel form 53d Panel form member 53e Rib 55-57 Jack 61 Hinge mechanism 61a, 61b Plate 61c Through hole 61d Panel form hinge pin 62 Hinge mechanism 62a, 62b Plate 62c Through hole 62d Wall hinge pin 63 Hinge mechanism 63b Plate 63c Through hole 63d Panel foam fixing pin 101 Panel foam (first panel foam)
102 Panel form (second panel form)
S space

Claims (4)

A mobile formwork device used for placing concrete on the inner peripheral surface of a tunnel,
A portal-type movable carriage that can run in the tunnel axis direction on the bottom of the tunnel,
An arch-shaped formwork that is arranged so as to cover the movable carriage from above, has an outer peripheral surface facing the inner peripheral surface of the tunnel, and can be expanded and contracted,
Comprising
The formwork is an arch-shaped wall disposed on the inner side in the tunnel radial direction and connected to the movable carriage, an arch-shaped panel form disposed on the outer side in the tunnel radial direction and detachably attached to the wall, Having a two-layer structure consisting of
When the panel form is unfolded, it forms a space for placing concrete between the inner peripheral surface of the tunnel, and when the panel form is mounted on the wall, it is supported by the movable carriage via the wall. , Supporting the concrete placed in the space, and when separated from the wall, the concrete is placed at the place where the concrete is placed and protects the concrete at this position Formwork device.   The mobile formwork according to claim 1, wherein the panel form is constituted by a plurality of panel form members connected in a circumferential direction of the tunnel, and the panel form members are detachably attached to the wall. apparatus.   When the formwork is reduced in diameter while the panel form is mounted on the wall, the reduced formable mobile formwork device passes through the other panel form that is protected. The mobile formwork apparatus according to claim 1 or 2, characterized by the above. A method of constructing lining concrete by placing concrete on the inner peripheral surface of a tunnel using the mobile formwork apparatus according to claim 3,
Unfolding the formwork with the first panel form mounted on the wall, placing concrete in the space,
After the predetermined period, the wall is detached from the first panel foam to reduce the diameter while maintaining the unfolded state of the first panel foam, and the first panel foam is placed at the concrete placement position. By curing concrete,
From the deployment position of the first panel form, to the deployment position of the second panel form that has been cured in the rearward direction of the tunnel lining, the mobile formwork device is moved backward,
Unfolding the wall of the mobile formwork apparatus that has been moved backward, and mounting the second panel form on the wall,
Reducing the diameter of the mold with the second panel foam mounted on the wall;
The movable formwork apparatus having the reduced diameter is advanced in the tunnel lining progress direction, passed through the first panel foam, and placed in the concrete in front of the first panel foam in the tunnel lining progress direction. A method for constructing lining concrete, characterized by being moved to a position.