Suspending jig for earth-retaining wall structural member, earth-retaining wall structural member with suspending jig, earth-retaining wall, and underground cutting method

Abstract

To provide a suspending jig for an earth-retaining wall structural member that can easily prevent damage of a tunnelling machine cutter bit.SOLUTION: A suspending jig 100 mounted to an earth-retaining wall structural member such as a pressure plate 200 has an embedded part 11 embedded into the pressure plate 200 and a protruded part 21 protruding from the pressure plate 200. The protruded part 21 has a suspending hole 23. The embedded part 11 is made of a material capable of cutting.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a hanger for a retaining wall structural member, an earth retaining wall structural member with a hanger, an earth retaining wall, and an underground cutting method. [Background technology]

[0002] Conventionally, when constructing a tunnel or the like using the shield tunneling method, a vertical shaft reinforced with an earth retaining wall is installed at the starting point or arrival point of the shield tunneling machine. In order to make it easier to cut the earth retaining wall with the cutter bit of the tunneling machine, for example, a diaphragm wall-type earth retaining wall has been proposed, which is constructed by arranging multiple vertically extending core materials made of a composite material in which inorganic fibers are mixed with resin foam at predetermined intervals and burying them in soil cement (for example, Patent Document 1).

[0003] Another method for reinforcing an earth retaining wall with anchors involves drilling anchor holes in the soil cement between adjacent core materials, inserting the anchors into the holes, and then anchoring one end of the anchor into the ground behind the earth retaining wall, with the other end of the anchor supported by the core material via a pressure plate.Patent Document 2 proposes a method in which the core material, anchor, and pressure plate are made of a composite that is easy to cut. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-27590 [Patent Document 2] Japanese Patent Publication No. 2022-186157 Summary of the Invention [Problem to be solved by the invention]

[0005] In the process of constructing an earth retaining wall, hanging devices are attached to the earth retaining wall structural components such as core materials and pressure plates, and the wall is then lifted by a crane and installed in the designated position. Conventionally, metal hoists have been used, so if the hoists remain in the excavation area of ​​the retaining wall after construction is complete, there is a risk of damaging the cutter bit of the tunneling machine. However, it is not easy to remove the hoists after the retaining wall structural members have been installed. The present invention aims to provide a suspending device for a retaining wall structural member that can easily prevent damage to the cutter bit of a tunneling machine. [Means for solving the problem]

[0006] The present invention has the following aspects. <1> A hanging device for an earth retaining wall structural member, which, when attached to the earth retaining wall structural member, has an embedded portion located inside the earth retaining wall structural member, and a protruding portion joined to the embedded portion and protruding from the earth retaining wall structural member, wherein a hanging hole is present in the protruding portion, and the embedded portion is made of a cuttable material. <2> A screw thread is present on the outer surface of the embedded portion. <1> The hanging device for an earth retaining wall structural member described in . <3> The protruding portion is made of a metal material, and a joint portion is present that detachably joins the embedded portion and the protruding portion. <1> or <2> The hanging device for an earth retaining wall structural member described in . <4> The joint portion includes a threaded portion in which a nut portion of the protruding portion and a bolt portion extending from the embedded portion are threadedly engaged. <3> The hanging device for an earth retaining wall structural member described in . <5> the protruding portion is made of a machinable material, and a joint is present between the embedded portion and the protruding portion; <1> or <2> The hanging device for an earth retaining wall structural member described in . <6> The joint portion includes a threaded portion in which a nut portion of the protruding portion and a bolt portion extending from the embedded portion are threadedly engaged. <5> The hanging device for an earth retaining wall structural member described in . <7> The joint portion further includes an adhesive layer that bonds the nut portion and the bolt portion. <6> The hanging device for an earth retaining wall structural member described in . <8> The protruding portion is made of a machinable material, and the embedded portion and the protruding portion are integrally molded. <1> or <2> The hanging device for an earth retaining wall structural member described in . <9> The length of the buried portion is 50 mm or more. <1> ~ <8> A hanging device for a retaining wall structural member according to any one of the preceding claims. <10> The machinable material is a composite material in which inorganic fibers are mixed in a foamed resin. <1> ~ <9> A hanging device for a retaining wall structural member according to any one of the preceding claims. <11> An earth retaining wall structural member; <1> ~ <10> A retaining wall structural member with a hanging device, comprising: a hanging device for a retaining wall structural member described in any one of claims 1 to 5, wherein the embedded portion of the hanging device for the retaining wall structural member is inserted inward from the outer surface of the retaining wall structural member and fixed. <12> The insertion direction of the buried part is perpendicular to the lifting direction. <11> The retaining wall structural member with a hanger according to claim 1. <13> an adhesive layer is present that bonds the embedded portion inserted into the earth-retaining wall structural member to the earth-retaining wall structural member; <11> or <12> The retaining wall structural member with a hanger according to claim 1. <14> The retaining wall structural member is a pressure plate. <11> ~ <13> An earth retaining wall structural member with a hanger as described in any one of the above. <15> The outer surface of the retaining wall structural member is the side surface of the head portion of the pressure plate. <14> The retaining wall structural member with a hanger according to claim 1. <16> The aforementioned <11> ~ <15> An earth retaining wall constructed using the earth retaining wall structural member with hanging devices described in any one of the above, wherein the buried portion is present inside the earth retaining wall. <17> The aforementioned <16> An underground cutting method comprising the step of cutting the retaining wall described in claim 1. [Effects of the Invention]

[0007] The suspending device for a retaining wall structural member of the present invention can easily prevent damage to the cutter bit of the tunneling machine. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view of a sling according to a first embodiment of the present invention. FIG. [Figure 2]FIG. 2 is a front view illustrating a method for attaching the suspending device according to the first embodiment of the present invention to an earth-retaining wall structural member. [Figure 3] FIG. 1 is a perspective view of a retaining wall structural member with hanging devices according to a first embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the following diagrams are schematic diagrams for easily explaining the configuration, and the dimensional ratios of each component may differ from the actual ones.

[0010] First Embodiment <Hanging fixture for retaining wall structural components> 1 is a plan view of a sling for a retaining wall structural member (hereinafter simply referred to as a "sling") according to this embodiment. The sling 100 of this embodiment has an embedded portion 11 that is embedded in the retaining wall structural member, and a protruding portion 21 that protrudes from the retaining wall structural member. In this embodiment, the embedded portion 11 and the protruding portion 21 are separate members. The embedded portion 11 is a part of the rod-shaped member 10, and the protruding portion 21 is a ring-shaped member 20. Both members are detachably joined at a joint 31.

[0011] The ring-shaped member 20, which is the protrusion 21, has a hanging hole 23 for hanging a crane hook or the like, and a nut portion 24 for joining to the buried portion 11. The hollow portion surrounded by the ring-shaped member 20 is the hanging hole 23. The cross section of the ring-shaped member 20 parallel to the direction of diameter D of the hanging hole 23 is circular. The axial direction that passes through the center of the hanging hole 23 and is perpendicular to the direction of diameter D is defined as the direction of the central axis Q of the hanging hole 23. The nut portion 24 is formed as a through-hole that passes through the ring-shaped member 20 and has a thread on its inner peripheral surface. The axis P direction of the nut portion 24 is parallel to the diameter D direction of the suspension hole 23.

[0012] The rod-shaped member 10 has an embedded portion 11 and a bolt portion 13 extending from one end of the embedded portion 11. A thread is formed on the outer surface of the bolt portion 13 to detachably thread onto the nut portion 24 of the protruding portion 21. The embedded portion 11 and the bolt portion 13 are coaxial and have the same diameter. A thread of the same shape as the outer surface of the bolt portion 13 is also formed on the outer surface of the embedded portion 11, continuing from the bolt portion 13.

[0013] In this embodiment, the ring-shaped member 20 is made of a metal material, such as steel or stainless steel. The thickness of ring-shaped member 20 can be set appropriately depending on the location where sling device 100 is attached and the strength required. The inner diameter of the ring-shaped member 20, that is, the size of the suspension hole 23 in the direction of diameter D, can be set appropriately depending on the size of the suspension device such as a hook and the required strength.

[0014] The rod-shaped member 10 is made of a machinable material, and a composite material in which inorganic fibers are mixed in a foamed resin is preferable as the machinable material. Examples of the inorganic fibers that are preferable include glass fibers and carbon fibers. An example of a composite is a urethane foam reinforced with glass fiber. The composite may contain a solid filler such as silica sand, fly ash, or rubber chips. Furthermore, a portion of the composite may contain a different material such as rubber or a resin sheet. An example of the composite is Eslon Neo Lumber FFU (FFU, Fiber Reinforced Foamed Urethane, registered trademark, manufactured by Sekisui Chemical Co., Ltd.). Eslon Neo Lumber FFU is a thermosetting resin foam obtained by aligning long glass fibers in a predetermined direction (for example, the length direction of the embedded portion 11), embedding the long glass fibers in a thermosetting resin, and then hardening the resin.

[0015] The length L of embedded portion 11 in the direction of axis P can be set appropriately depending on the location where sling device 100 is attached and the strength required. For example, it is preferably 50 mm or more. There is no particular upper limit.

[0016] The lifting device 100 can be manufactured by detachably threading the bolt portion 13 of the rod-shaped member 10 and the nut portion 24 of the ring-shaped member 20 to form a joint 31. In this embodiment, the joint 31 is the threaded portion between the bolt portion 13 and the nut portion 24.

[0017] The sling device 100 of this embodiment is used by being attached to an earth retaining wall structural member. The retaining wall structural components are components used in the construction of the retaining wall that require a lifting operation during construction. They are preferably components that are present in the excavation area of ​​the retaining wall when the wall is excavated. Specific examples include core materials and pressure plates.

[0018] The hanger 100 can be attached to the retaining wall structural member, for example, in the manner shown in FIG. First, a pilot hole 41 is formed in advance on the outer surface 40a of the retaining wall structural member 40 at the position where the hanging device 100 will be attached. The inner diameter of the lower inner hole 41 is preferably slightly larger than the diameter of the embedded portion 11 of the rod-shaped member 10. The depth of the lower inner hole 41 is preferably slightly larger than the length L of the embedded portion 11 of the rod-shaped member 10.

[0019] Next, the pilot holes 41 are filled with an adhesive that has fluidity before hardening, and then the embedded portions 11 of the rod-shaped members 10 are inserted and the adhesive is hardened to fix the embedded portions 11 in the pilot holes 41. At this time, the bolt portions 13 of the rod-shaped members 10 protrude from the outer surface 40a of the retaining wall structural member 40. The adhesive in the pilot hole 41 flows to fill the gaps between the threads on the outer surface of the embedded portion 11, and then solidifies to form an adhesive layer. The adhesive layer bonds the outer surface of the embedded portion 11 to the inner surface of the pilot hole 41. The engagement of the threads of the embedded portion 11 with the adhesive layer makes it more difficult for the embedded portion 11 to slip out of the retaining wall structural member 40. The adhesive used to fix the embedded portion 11 in the prepared hole 41 is preferably a polyester adhesive, an epoxy resin adhesive, or the like.

[0020] Thereafter, the nut portion 24 of the ring-shaped member 20 is detachably screwed onto the bolt portion 13 to form the joint portion 31. As shown in FIG. 2, the bolt portion 13 and the nut portion 24 may be screwed together with a washer 51 interposed between the ring-shaped member 20 and the outer surface 40a of the retaining wall structural member 40. In this embodiment, the washer 51 may be made of metal. Examples of metal materials that may be used for the washer 51 are the same as those for the protrusion 21. In this way, the hanging device 100 can be attached to the retaining wall structural member 40.

[0021] <Earth retaining wall structural member with hanging fixture> 3 is a schematic diagram showing an example of a pressure plate with a sling 100 attached to a pressure plate 200, as an example of an earth retaining wall structural member with a sling according to this embodiment. In the drawing, the symbol X indicates the lifting direction. The pressure plate 200 in this example has a flat pressure plate body 201 and a rectangular parallelepiped head portion 202 laminated and integrated onto the upper surface of the pressure plate body 201. The outer surface of the head portion 202 of the pressure plate 200 has four side surfaces 202a parallel to the lifting direction X and an upper surface 202b perpendicular to the lifting direction X. Although not shown, the upper surface 202b of the head portion 202 has holes for attaching anchors.

[0022] The hanging device 100 is attached to the center of each of the two opposing side surfaces 202a, 202a of the head portion 202. The hanging device 100 fixes the embedded portion 11 by inserting it inward from the side surface 202a. The direction in which the embedded portion 11 is inserted is such that the length direction of the embedded portion 11 is perpendicular to the lifting direction X and perpendicular to the side surface 202a. The pilot hole for inserting the embedded portion 11 may be formed in advance in the side surface 202a, and an adhesive layer for bonding the inside of the head portion 202 and the embedded portion 11 may be provided in the pilot hole.

[0023] 3, when the suspender 100 is attached to the pressure-receiving plate 200, the direction of the central axis Q of the suspending hole 23 is parallel to the X direction, but this is not limited to this. The orientation of the suspending hole 23 can be changed as appropriate.

[0024] <Earth retaining wall> A method for constructing an earth retaining wall using the earth retaining wall structural member with hanging fixtures (pressure plate with hanging fixtures) of this embodiment will be described. First, hook 300 at the tip of a hanging member such as a shackle, wire, or nylon sling is hung through hanging hole 23 of hanging tool 100. Next, the pressure plate with the hanging device is lifted in the X direction and moved to the construction position while suspended. After arriving at the construction position, the pressure plate 200 is rotated while suspended so that the top surface of the pressure plate body 201 is parallel to the vertical direction, and then the pressure plate 200 is placed at a predetermined position on the retaining wall. Next, anchors are attached through holes (not shown) on the top surface 202b of the head portion 202 to secure the pressure plate 200 to the retaining wall. The anchors are made of a cuttable material. Examples of cuttable materials are the same as those for the embedded portion 11.

[0025] After pressure plate 200 has been fixed in place in this manner, hook 300 is removed from suspender 100, and protrusion 21 of suspender 100 is then removed. If a washer is used, the washer is also removed. In this way, an earth retaining wall equipped with a pressure plate 200 and having the embedded portion 11 of the hanging device 100 inside is obtained. The configuration of the pressure receiving plate is not limited to that of this example, and known pressure receiving plates can be used. For example, in the pressure receiving plate of this example, the upper surface 202b of the head portion 202 and the upper surface of the pressure receiving plate main body 201 are parallel to each other, and these surfaces are perpendicular to the lifting direction X, but this is not limited to this. For example, the upper surface of the head portion 202 and the upper surface of the pressure receiving plate main body 201 do not have to be parallel to each other. In that case, for example, it is preferable that the upper surface of the pressure receiving plate main body 201 is perpendicular to the lifting direction X.

[0026] ≪Underground cutting method≫ The underground cutting method of this embodiment includes a step of cutting the retaining wall inside which the buried portion 11 of the hanging device 100 is located. The cutting step can be performed by a known method, for example, a method of cutting using a tunneling machine. Since the embedded portion 11 of the sling 100 is made of a cuttable material, even if the embedded portion 11 is present in the cutting area of ​​the retaining wall, damage to the cutter bit of the tunneling machine can be prevented.

[0027] The suspension device 100 of this embodiment has a metal protrusion 21, but the protrusion 21 and the buried part 11 are detachably joined, so that after the suspension device 100 is attached and the pressure plate 200 is installed, the protrusion 21 can be easily removed from the pressure plate 200. In other words, the metal members that make up the sling can be easily removed from the retaining wall, making it easy to prevent damage to the cutter bit of the tunneling machine.

[0028] The hanging device 100 of this embodiment can form a hanging hole 23 in an earth-retaining wall structural member (e.g., a pressure plate) by inserting and fixing the embedded section 11 into the earth-retaining wall structural member. Therefore, the area and space required to attach the hanging device 100 are small, and the hanging device 100 can be attached even to a narrow area on the outer surface of the earth-retaining wall structural member.

[0029] In this embodiment, a screw thread is provided on the outer surface of the embedded portion 11, but this is not limited to a screw thread, and any uneven shape that makes it difficult for the embedded portion 11 to come off the retaining wall structural member may be used. In this embodiment, the hanging hole 23 is circular in plan view, but is not limited to this and may have any shape that allows hanging by a hook or the like. Although washer 51 does not have to be provided, if washer 51 is interposed between protrusion 21 and the outer surface of the retaining wall structural member, the stress applied to embedded part 11 when suspended can be reduced. In particular, when the insertion direction of embedded part 11 is not vertical in the suspended state, such as in the case of horizontal suspension, washer 51 can reduce the vertical stress applied to embedded part 11.

[0030] <Second embodiment> The present embodiment is significantly different from the first embodiment in that the ring-shaped member 20 is made of a machinable material. That is, in this embodiment, the embedded portion 11 and the protruding portion 21 are made of separate members, and both the rod-shaped member 10 and the ring-shaped member 20 are made of a machinable material. The materials of the rod-shaped member 10 and the ring-shaped member 20 may be the same or different. In this embodiment, the joint 31 does not have to be detachable. For example, in the joint 31, an adhesive layer that bonds the nut portion 24 and the bolt portion 13 to each other may be provided at the threaded portion between the nut portion 24 and the bolt portion 13. The adhesive used to bond the nut portion 24 and the bolt portion 13 is preferably, for example, a polyester adhesive, an epoxy resin adhesive, or the like.

[0031] The cuttable material constituting the ring-shaped member 20 is preferably a composite in which inorganic fibers are mixed with foamed resin. Examples of inorganic fibers include glass fiber and carbon fiber. Examples of composites include urethane foam reinforced with glass fiber. The composite may contain solid fillers such as silica sand, fly ash, and rubber chips. Furthermore, a portion of the composite may contain a different material such as rubber or a resin sheet. An example of the composite is Eslon Neo Lumber FFU (FFU, Fiber Reinforced Foamed Urethane, registered trademark, manufactured by Sekisui Chemical Co., Ltd.). Eslon Neo Lumber FFU is a thermosetting resin foam obtained by aligning long glass fibers in a predetermined direction (for example, the circumferential direction of the hanging hole 23), embedding the long glass fibers in a thermosetting resin, and then hardening the resin.

[0032] The sling of this embodiment can be attached to the retaining wall structural member 40 in the same manner as in the first embodiment. In this embodiment, when a washer 51 is interposed between the ring-shaped member 20 and the outer surface 40a of the retaining wall structural member 40, the washer 51 is made of a machinable material. Examples of machinable materials that can be used to make the washer 51 are the same as those for the ring-shaped member 20 of this embodiment.

[0033] <Earth retaining wall structural member with hanging fixture> The retaining wall structural member with hangers of this embodiment is the same as that of the first embodiment, except that the protruding portion 21 is made of a cuttable material.

[0034] <Earth retaining wall> The method of constructing an earth retaining wall using the retaining wall structural member with hanging device (pressure plate with hanging device) of this embodiment is the same as that of the first embodiment, in that the pressure plate with hanging device is lifted in the X direction, moved to the construction position, fixed to the earth retaining wall using anchors made of a cuttable material, and the hook is removed from the hanging device. After this, in the first embodiment, the protrusion 21 and the washer of the sling are removed, but in this embodiment, it is not necessary to remove the protrusion 21 and the washer. The retaining wall equipped with the pressure plate of this embodiment has an embedded portion 11 of the hanging tool inside, and a protruding portion 21 is joined to the embedded portion 11.

[0035] ≪Underground cutting method≫ The underground cutting method of this embodiment includes a step of cutting a retaining wall in which a sling (embedded portion 11 and protruding portion 21) is present. Because the sling (embedded portion 11 and protruding portion 21) is made of a cuttable material, even if the sling is present in the cutting area of ​​the retaining wall, damage to the cutter bit of the tunneling machine can be prevented.

[0036] Because the hoisting tool of this embodiment can cut the protruding portion 21 and the buried portion 11, there is no need to remove the hoisting tool from the pressure plate after installing it. This eliminates the need to remove the hoisting tool after installation, and makes it easy to prevent damage to the cutter bit of the tunneling machine.

[0037] <Third embodiment> The major difference between the sling of this embodiment and the second embodiment is that the embedded portion 11 and the protruding portion 21 are integrally formed. There is no joint between the embedded portion 11 and the protruding portion 21. The outer surface of the embedded portion 11 has a screw thread, as in the second embodiment. The cuttable material that forms the sling (embedded portion 11 and protruding portion 21) of this embodiment is the same as that of the second embodiment.

[0038] When attaching the hanging device of this embodiment to a retaining wall structural member, after filling a pilot hole 41 provided in the retaining wall structural member 40 with adhesive, the embedded portion 11 of the hanging device is inserted and the adhesive is allowed to harden to fix the embedded portion 11 in the pilot hole 41. At this time, the protruding portion 21 of the hanging device protrudes from the outer surface 40a of the retaining wall structural member 40. A washer made of a machinable material may be interposed between the protruding portion 21 and the outer surface 40a of the retaining wall structural member 40. The adhesive used to fix the embedded portion 11 in the prepared hole 41 is preferably a polyester adhesive, an epoxy resin adhesive, or the like.

[0039] <Earth retaining wall structural member with hanging fixture> The retaining wall structural member with hangers of this embodiment is the same as that of the second embodiment, except that the embedded portion 11 and the protruding portion 21 are integrally formed.

[0040] <Earth retaining wall> The construction method of the earth retaining wall using the retaining wall structural member with hanging devices (pressure plate with hanging devices) of this embodiment is the same as that of Embodiment 2. The retaining wall equipped with the pressure plate of this embodiment has hanging devices.

[0041] ≪Underground cutting method≫ The underground cutting method of this embodiment is the same as that of the second embodiment. As with the second embodiment, the hoisting tool of this embodiment can cut the protruding portion 21 and the buried portion 11, so after the hoisting tool is attached and the pressure plate is installed, there is no need to remove the hoisting tool from the pressure plate. Therefore, there is no need to remove the hoisting tool after installation, and damage to the cutter bit of the tunneling machine can be easily prevented. [Explanation of symbols]

[0042] 10 Rod-shaped member 11 Buried section 13 Bolt section 20 Ring-shaped member 21 Protrusion 23 Hanging hole 24 Nut part 31 Joint 40 Earth retaining wall structural members 40a Exterior 41 Pilot hole 51 Washer 100 Hanging device (hanging device for retaining wall structural members) 200 Pressure plate (retaining wall structural member) 201 Pressure plate body 202 Head 202a side 202b top surface 300 hooks

Claims

1. A hanging device attached to an earth retaining wall structural member, The earth retaining wall structural member has an embedded portion located inside the earth retaining wall structural member when attached to the earth retaining wall structural member, and a protruding portion joined to the embedded portion and protruding from the earth retaining wall structural member, The protrusion has a hanging hole, A hanging device for a retaining wall structural member, wherein the embedded portion is made of a cuttable material.

2. The hanging device for a retaining wall structural member according to claim 1 , wherein a screw thread is present on the outer surface of the embedded portion.

3. The hanging device for a retaining wall structural member according to claim 1, wherein the protruding portion is made of a metal material and a joint portion is present that detachably joins the embedded portion and the protruding portion.

4. The hanging device for a retaining wall structural member according to claim 3 , wherein the joint portion includes a threaded portion where a nut portion of the protruding portion and a bolt portion extending from the buried portion are threadedly engaged.

5. The hanging device for a retaining wall structural member according to claim 1 , wherein the protruding portion is made of a cuttable material, and a joint is present that joins the buried portion and the protruding portion.

6. The hanging device for a retaining wall structural member according to claim 5 , wherein the joint portion includes a threaded portion where a nut portion of the protruding portion and a bolt portion extending from the buried portion are threadedly engaged.

7. 2. The hanging device for a retaining wall structural member according to claim 1, wherein the protruding portion is made of a cuttable material, and the embedded portion and the protruding portion are integrally formed.

8. The hanger for a retaining wall structural member according to any one of claims 1 to 7, wherein the cuttable material is a composite material in which inorganic fibers are mixed in a foamed resin.

9. An earth retaining wall structural member and a suspender for an earth retaining wall structural member according to claim 1, An earth retaining wall structural member with a hanging device, wherein the embedded portion of the hanging device for the earth retaining wall structural member is inserted inward from the outer surface of the earth retaining wall structural member and fixed.

10. An earth retaining wall constructed using the earth retaining wall structural member with hanging devices according to claim 9, An earth-retaining wall, wherein the buried portion is present inside the earth-retaining wall.

11. 11. A method of underground cutting, comprising the step of cutting the retaining wall of claim 10.

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