JP2006052606A - Connection structure of steel sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connection structure of a steel sheet which is easily and securely separated without execution after embedment of a tip shoe or a connection member in the ground. <P>SOLUTION: A pair of the steel sheets 1a, 1b which are divided and arranged at intervals while interposing a flexible water cut-off member 4 therebetween are connected with the tip shoe 9 or the connection member 15 which is composed of a biodegradable member. The tip shoe 9 or the connection member 15 which is composed of a biodegradable member is decomposed by microorganisms after placed and embedded in the ground and the connection of the steel sheets 1a, 1b with the tip shoe 9 or the connection member 15 is released. The biodegradable member may be a biodegradable plastic member. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a steel sheet pile connection structure used for construction and civil engineering work such as land reclamation work, revetment work, and dike construction work.

A plurality of steel sheet piles are connected to each other and placed in the ground. By constructing the wall with steel sheet piles, the ground before and after is divided and held, preventing the collapse of the ground. This construction work is widely used as a quay such as a coast, a revetment, a water barrier such as a river, a waterway, a weir, or a levee. After the steel sheet pile is buried in the ground, the steel sheet pile as well as the joint part may come off due to ground displacement such as an earthquake with the passage of time, which may cause a large deformation and destruction.
For this reason, the steel sheet pile is divided into two to form a pair, and a flexible water-stopping member such as rubber or synthetic resin is provided between the divided steel sheet piles. The structure which prevents damage and destruction of water and stops water is used. In order to drive the steel sheet pile having this configuration and drive it into the ground, a substantially V-shaped inclined surface is provided to facilitate the protection and embedding of the flexible water-stopping member at the bottom of the pair of steel sheet piles. A tip scissors having The divided steel sheet piles are connected by a tip rod.

  In order to drive this steel sheet pile into the ground, the upper part of the steel sheet pile is struck with a hammer or the like and buried. Since the steel sheet pile is provided with a flexible water-stopping member, a tip rod is attached for protection during driving as described above. After the tip is buried, it is separated. Various methods are known for the configuration in which the tip ridge is detachably embedded. As an example, the present applicant has also proposed a flexible stretch-and-water-proof sheet pile for sheet pile walls (see Patent Document 1).

  As shown in FIG. 22 and FIG. 23, this apparatus straddles each of the tip end fittings 51a and 51b in a state where the tip end fittings 51a and 51b attached to the divided steel sheet piles 50a and 50b are temporarily fixed. The fixing plate 52 is temporarily welded with low strength. The upper parts of the steel sheet piles 50a and 50b are connected by a head fixing plate 8 (see FIG. 1). The steel sheet piles 50a and 50b in this state are sandwiched between the head fixing plate 8 with a vibro hammer and driven to a predetermined depth, and then the head fixing plate 8 is cut and separated, and one of the pair of steel sheet piles 50a and 50b is removed with a hammer. After hitting, the fixing plate 52 for temporary welding of the end fittings 51a and 51b is separated, and then the other steel sheet pile is placed to align the pair of steel sheet piles 50a and 50b. After embedding the pair of steel sheet piles 50a and 50b, the head fixing plate 8 is removed. In this way, the pair of steel sheet piles 50a and 50b are buried in the ground in a state where the end fittings 51a and 51b are separated and separated from each other, and the structure can cope with displacement such as ground fluctuation.

As another example, a method of separating the tip ridge by slightly pulling the steel sheet pile upward with a wire after attaching the tip ridge in the inserted state to the tip of the steel sheet pile, driving the steel sheet pile in this state to a predetermined depth (for example, , Patent Documents 2 and 3), or a weakly tentatively welded tip hook attached with an interval is fixed with a fixed plate, and the fixed plate of the tip hook is buried in the ground in this state for ground deformation, etc. A structure (for example, patent document 4) etc. which expects that the temporary welding part of a fixed plate destroys and follows is known.
Japanese Utility Model Publication No. 64-4915 Japanese Patent Publication No. 63-58973 JP 2003-49421 A JP 2004-52306 A

However, the above-described conventional configuration includes various problems and lacks certainty. Driving one of the pair of steel sheet piles after placing in the ground requires extra work for cutting and driving. Also, the tip must be divided. On the other hand, pulling up a pair of steel sheet piles after placing them in the ground requires an extra pulling process. It is not possible to confirm whether welding has been released.
Further, if the welding is made low so as not to be too strong, there is a possibility that the welded part may come off when placing. In this method as well, the tip ridge is divided. Each method has a problem that the fixing plate must be welded and extra work is required for separation before and after placing. Therefore, it is required to complete the construction only by normal driving so that the tip can be reliably separated, and the construction is simplified as compared with the conventional construction.

The present invention has been conceived to solve such a conventional problem and achieves the following object.
An object of the present invention is a steel sheet pile connection structure in which a flexible steel sheet pile for water-stopping can be easily and reliably separated without being divided into tip ridges and embedded in the ground without any post-installation. Is to provide.

The present invention takes the following means in order to achieve the object.
The steel sheet pile coupling structure according to the first aspect of the present invention is a structure that couples a pair of steel sheet piles that are divided and arranged at predetermined intervals via a water-stopping member. It is comprised by the coupling member couple | bonded with a steel sheet pile, and the said tip edge hook or / and a coupling member consist of a biodegradable member which decomposes | disassembles in the ground after the said steel sheet pile construction.

  The biodegradable member means a member such as biodegradable plastic, artificial wood made of natural or natural materials, paper made of natural materials, or a mixture thereof.

The steel sheet pile coupling structure of the present invention 2 is the present invention 1,
The tip scissors are integrated across the pair of steel sheet piles.

The steel sheet pile connection structure of the present invention 3 is the present invention 1,
The coupling member is a screw member manufactured to fix the tip end to the steel sheet pile.

The steel sheet pile coupling structure of the present invention 4 is the present invention 1,
The tip ridge is characterized in that a part to be coupled of the biodegradable member is partially provided for coupling with the coupling member.

The connection structure of the steel sheet pile of the present invention 5 in the present invention 1,
The water stop member is a flexible water stop member.

The steel sheet pile connection structure of the present invention 6 is the present invention 2,
The tip ridge has a protective plate at the end on the underground pressing side.

The steel sheet pile connection structure of the present invention 7 is the invention 1 to 6,
The biodegradable member is a biodegradable plastic member.

  The biodegradable plastic member includes a microbial system [biopolyester (PHB / V, etc.), bacterial cellulose, microbial polysaccharide (pullulan, curdlan, etc.)], a chemical synthesis system [aliphatic polyester (polycaprolactone, polybutylene succinate, Polyethylene succinate, polyglycolic acid, polylactic acid, etc.), polyvinyl alcohol, polyamino acids (PMLG, etc.), other polyurethanes, nylon oligomers, etc.], natural products (chitosan / cellulose, starch, cellulose acetate, etc.), composites (starch) / Aliphatic polyester, starch / polyvinyl alcohol, blends and laminates of those mentioned above, and the like.

  Since a biodegradable member (for example, biodegradable plastic) is used for the tip rod or the connecting member of the tip rod, it is decomposed by natural force without any special work after placement, that is, it is decomposed by microorganisms and bonded. It can be canceled now. As a result, steel sheet piles with flexible water-stopping members can be reliably placed while maintaining the original state, there is no need for welding before placing, and there is no need for splitting the tip rivets after placing. It was possible to make a simple configuration. By eliminating the need for splitting, the construction period could be shortened and construction costs were reduced.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration of a steel sheet pile having a flexible water-stopping member that is an object of the present invention, and FIG. 2 is a cross-sectional view with the flexible water-stopping member attached, showing a configuration similar to the conventional one. The steel sheet pile 1 is a pair of steel sheet piles having a shape obtained by dividing a U-shaped steel sheet pile at the center of the web 2. The webs 2 are arranged on the same plane at intervals. A flexible stretch waterproofing member 4 is attached as a flexible waterproofing member having a plurality of bent shapes 3 in the middle. This flexible stretch-and-water-stop member 4 is a rubber or synthetic resin strip. Both sides are flanges 5, and are fixed to the web 2 by bolts 7 and nuts 7 a via pressing plates 6.
An upper connecting member 8 made of steel is disposed above the flexible elastic waterproofing member 4 with a space therebetween. The steel sheet piles 1a and 1b divided into the upper connecting member 8 are integrally fixed. A tip rod 9 is provided in the lower part of the steel sheet pile 1 configured as described above. After the steel sheet pile 1 is placed, the upper connecting member 8 and the tip end 9 are separated. The present invention is a structure related to the coupling of the tip ridge 9.

  Next, the embodiment will be described in detail, but before that, the biodegradable member constituting the subject of the present invention will be described. Biodegradable members applicable to the present invention include biodegradable plastics, members such as paper and wood having a biodegradable function. In this embodiment, the biodegradable member is described as a biodegradable plastic member. This biodegradable plastic member is formed, for example, mainly using grain starch as a starting material, and has a normal plastic function when used. However, when it is abandoned in the soil or the sea due to disposal or the like, it is a plastic that is decomposed by microorganisms and loses its original plastic function, and eventually becomes water and carbon dioxide and is reduced to nature.

Biodegradable plastics are biodegradable in soil and the like, and include, for example, types such as microbial, chemical synthesis, natural product, and composites.
Examples of the microbial system include biopolyester (PHB / V, etc.), bacterial cellulose, microbial polysaccharide (pullulan, curdlan, etc.) and the like. Chemical synthesis systems include, for example, aliphatic polyesters (polycaprolactone, polybutylene succinate, polyethylene succinate, polyglycolic acid, polylactic acid, etc.), polyvinyl alcohol, polyamino acids (PMLG, etc.), other polyurethanes, nylon oligomers, etc. There is.
Furthermore, natural products include chitosan / cellulose, starch, cellulose acetate and the like. Examples of the composite include starch / aliphatic polyester, starch / polyvinyl alcohol, blends and laminates of the aforementioned substances, and the like.

  This biodegradable plastic member can be manufactured in a wide range from soft to hard, and has normal plastic strength when used normally, but is weak to heat. This biodegradable plastic member is referred to as “green plastic” under the public name of the Ministry of Economy, Trade and Industry. In the form of use, it is widely used for garbage bags, transplanting seedling pots for horticulture, heat insulation, formwork for civil engineering work, earth retaining etc. In the present invention, the biodegradable member including the biodegradable plastic member is applied to the tip end of the steel sheet pile and the coupling member.

(Embodiment 1)
FIG. 3 is a front view schematically showing Form 1 in which the entire tip ridge is a biodegradable plastic member, and FIG. 4 is a cross-sectional view taken along line XX of FIG. The tip rod 10 is an integrated biodegradable plastic member having a substantially triangular cross section, and is attached across a pair of steel sheet piles 1a and 1b. This attachment is made by bolts 11. The biodegradable plastic constituting the basic structure of the present invention has a certain strength, but a substantially V-shaped protective plate 12 is attached to the end portion on the driving side for protection during driving. ing.
After the placement, the tip hook 10 is kept in the ground, but with the passage of time, the tip hook 10 rapidly decreases in strength due to the decomposition of microorganisms and eventually disappears. Thereby, the connection relationship between the pair of steel sheet piles 1a and 1b is canceled. Eventually, the tip rod 10 becomes water and carbon dioxide and disappears, and only the protective plate 12 is separated and remains in the ground.

(Embodiment 2)
In this form 2, a biodegradable plastic is applied to the coupling member. 5 is an external view of the second embodiment, FIGS. 6 to 8 are diagrams showing a specific configuration of the second embodiment, FIG. 6 is a front view, FIG. 7 is a plan view, and FIG. Sectional views cut along line -A are respectively shown. An attachment portion 13 for attaching the tip rod 14 to the lower part of the steel sheet pile 1 is provided. The attachment portion 13 is provided on each of the pair of steel sheet piles 1a and 1b. The mounting portion 13 has a frame structure and has a space inside.
On the other hand, the tip rod 14 has a substantially V-shaped frame structure made of steel and is attached over the respective attachment portions 13 and has a space inside. When the tip 14 is attached to the attachment portion 13, the internal space position coincides, and the biodegradable plastic coupling member 15 is attached to the space portion so as to straddle the tip portion 14 for each attachment portion 13. In this attachment, one end of the coupling member 15 is fixed to the attachment portion 13 via the first bolt 16 and the nut 16a, and the other end of the coupling member 15 is fixed to the tip flange 14 via the second bolt 17. Done in

  In this state, the pair of steel sheet piles 1a and 1b and the tip rod 14 are integrally fixed via a biodegradable plastic coupling member 15. In this state, it is placed in the soil, and the connecting member 15 changes as shown in FIG. 9 as time elapses. FIG. 9 schematically shows the progress. 9A, when the time has elapsed from the time of placement, it is decomposed by microorganisms, and the connecting member 15 that is a biodegradable plastic disappears as shown in FIG. 9B. That is, the attachment portion 13 and the tip hook 14 remain in a state in which only the frame configuration and the bolts 16 and 17 are formed, and when a ground change or the like occurs, the tip hook 14 is attached to the attachment portion 13 as shown in FIG. The steel sheet piles 1a and 1b are completely separated from each other, so that defects such as distortion do not occur.

  10 to 13 show other forms in accordance with the above-described configuration. 10 is a front view, FIG. 11 is a plan view, and FIG. 12 is a cross-sectional view of FIG. 10 cut along line BB. In this embodiment, the biodegradable plastic coupling member 18 is formed into a cylindrical shape. In the case where the strength is ensured or in the case of soft soil, the connecting member 18 can be made thinner than the above-described case. Effective in reducing the material of biodegradable plastic members. The attachment portion 13 and the tip flange 14 are attached by bolts 16 and 17 and the nut 16a. However, in the case of this embodiment, the portion to the tip flange 14 is fixed with a nut 19 interposed. ing. FIG. 13 is a view showing the change in the coupling state of the steel sheet piles 1a and 1b after placement according to FIGS. 13 (a), 13 (b), and 13 (c). The process is basically the same as that shown in FIG.

(Embodiment 3)
In this form 3, the bolt 20 of the coupling member is made of a biodegradable plastic member. As described above, the third embodiment is specifically shown in FIGS. 14 is a front view, FIG. 15 is a plan view, and FIG. 16 is a cross-sectional view of FIG. 14 cut along the line CC. A mounting portion 21 for mounting the tip rod 22 is provided below the steel sheet piles 1a and 1b. The attachment portion 21 is provided on each of the pair of steel sheet piles 1a and 1b in a frame configuration.
On the other hand, the tip flange 22 is made of a steel material and has a substantially V-shaped frame structure integrally formed, and is attached across the attachment portions 21. When the tip ridge 22 is attached to the attachment portion 21, each attachment portion 21 and the tip ridge 22 are attached with bolts 20 made of a biodegradable plastic member. A nut body 23 is fixed to the tip flange 22 side, and the bolt 20 is fastened to the nut body 23 with the frame of the attachment portion 21 interposed therebetween. FIG. 17 is a view showing changes in the coupled state of the steel sheet piles 1 after placement according to FIGS. 17A, 17B, and 17C, as described above. Since the bolt 20 disappears, the coupled state is canceled, and the attachment portion 21 of the steel sheet piles 1a and 1b separates the tip flange 22 and becomes free.

  18 and 19 show a modification of the third embodiment, in which the bolt 20 is directly fastened to the solid tip rod 24. FIG. In this embodiment, the attachment portion 21 and the tip flange 24 are directly fastened by the bolt 20. The tip rod 24 may be a casting, and may be any material other than steel or steel as long as it has a strength that can withstand placing, and the type of material is not limited.

  FIGS. 20 and 21 show other forms according to the above-described configuration, in which a biodegradable plastic member is applied to a nut body as a member to be coupled. 20 is a front view, and FIG. 21 is a cross-sectional view taken along line DD in FIG. In this embodiment, the bolt 25 is made of a normal steel material, and a biodegradable plastic member is applied to the nut body 27 or the nut holding body which is a coupling member of the tip rod 26. In this case as well, the substantial function is the same as described above in the form in which the bolt 25 is fastened and fixed to the nut body 27 of the tip collar 26 via the mounting portion 28 only by replacing the bolt and the nut. . However, in the case of bolts and nuts, since the coupling area is small and the coupling rigidity is insufficient, the number of bolts and nuts may be increased. Although not shown in the figure after the placement, the nut body 27 disappears and the coupled state is cancelled, and the attaching portion 28 of the steel sheet piles 1a and 1b separates the tip rod 26 and becomes free.

As mentioned above, although various forms were demonstrated, it cannot be overemphasized that this invention is not limited to this Embodiment. For example, a method of placing the steel sheet pile with the tip ridge interposed therebetween, or a method of directly connecting the pinched tip ridge to the steel sheet pile may be used.
Although the biodegradable member has been described as a biodegradable plastic member, it is needless to say that it has a biodegradable function. For example, artificial wood made of natural or artificial materials, wood, paper made of natural materials, and those made by mixing these may be used. These members are members having a certain strength in a compressed press state, and can be decomposed by microorganisms after being placed.

Drawing 1 is a front view showing the whole steel sheet pile which has a flexible expansion and contraction waterproofing member. FIG. 2 is a cross-sectional view of a steel sheet pile having a flexible stretch waterproofing member. FIG. 3 is a front view schematically showing the configuration of Form 1 in which the entire tip end ridge is a biodegradable plastic member. FIG. 4 is a cross-sectional view of FIG. 3 taken along line XX. FIG. 5 is an external view showing a configuration of a second embodiment in which a biodegradable plastic is applied to a coupling member and a steel sheet pile and a tip rod are coupled. FIG. 6: is a front view which shows the structure of the form 2 which applies a biodegradable plastic to a coupling member, and couple | bonds a steel sheet pile and a tip tack. FIG. 7 is a plan view of FIG. FIG. 8 is a cross-sectional view of FIG. 6 taken along line AA. FIG. 9 is an explanatory view showing the separation process of the tip scissors after placing in form 2. FIG. 10 is a front view showing another embodiment in which a biodegradable plastic is applied to a coupling member. FIG. 11 is a plan view of FIG. 12 is a cross-sectional view of FIG. 10 taken along line BB. FIG. 13 is an explanatory view showing the separation process of the tip scissors after placement in another embodiment. FIG. 14 is a front view showing a form 3 in which a biodegradable plastic is applied to a bolt as a coupling member. FIG. 15 is a plan view of FIG. 16 is a cross-sectional view of FIG. 14 taken along the line CC. FIG. 17 is an explanatory view showing the separation process of the tip ridge after placing in form 3. FIG. 18 is a front view showing a modification of the third embodiment. FIG. 19 is a side view of FIG. FIG. 20 is a front view showing another embodiment in which a biodegradable plastic is applied to a nut body that is a coupling member. FIG. 21 is a cross-sectional view of FIG. 20 taken along line DD. FIG. 22 is a front view showing a connecting configuration of the tip end of the conventional configuration. FIG. 23 is a side view showing a joint configuration of the tip flange of the conventional configuration.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b ... Steel sheet pile 4 ... Flexible expansion-and-contraction water stop member 9, 10, 14, 22, 24, 26 ... Tip hook 11, 16, 17, 20, 25 ... Bolt 12 ... Protection plate 13, 21, 28 ... Mounting portion 15, 18 ... Coupling member 23, 27 ... Nut body

Claims (7)

It is a structure that couples a pair of steel sheet piles that are divided and arranged at predetermined intervals via a water stop member,
The structure is composed of a tip ridge and a coupling member that couples the tip ridge to the steel sheet pile,
The said tip hook or / and a connection member are the connection structures of the steel sheet pile which consist of a biodegradable member decomposed | disassembled in the ground after the said steel sheet pile construction. In the steel sheet pile connection structure according to claim 1,
The jointed structure of steel sheet piles, wherein the tip flange is integrated across the pair of steel sheet piles. In the steel sheet pile connection structure according to claim 1,
The coupling member is a screw member manufactured to fix the tip end to the steel sheet pile. A steel sheet pile coupling structure. In the steel sheet pile connection structure according to claim 1,
The joined structure of the steel sheet pile, wherein the joined portion of the biodegradable member is partially provided on the distal end for coupling with the coupling member. In the steel sheet pile connection structure according to claim 1,
The water stop member is a flexible water stop member. A steel sheet pile connection structure, wherein: In the steel sheet pile connection structure according to claim 2,
The said tip tack has the protection plate in the underground press side edge part. The joining structure of the steel sheet pile characterized by the above-mentioned. In the steel sheet pile connection structure according to any one of claims 1 to 6,
The biodegradable member is a biodegradable plastic. A steel sheet pile connection structure.

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