Earth retaining wall structure member, construction method of earth retaining wall, and underground cutting method

Abstract

To provide an earth retaining wall structure member that makes it possible to perform a cutting process of an earth retaining wall more easily.SOLUTION: An earth retaining wall structure member includes a core material 8a, and a hanger 10a provided on an upper end of the core material 8a. The core material 8a is a composite in which inorganic fibers are mixed in a resin form. The hanger 10 is attachably and detachably bonded to the core material 8a. Alternatively, an earth retaining wall structure member includes a core material 8a and a hanger provided on one end in a surface direction of the core material 8a. The core material 8a is a composite in which inorganic fibers are mixed in a resin form, and the hanger is a composite in which inorganic fibers are mixed in a resin form.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a retaining wall structural member, a method for constructing a retaining wall, and a method for underground cutting.

Background Art

[0002] In the method of cutting the ground with an excavator, retaining walls are formed at the starting point and the ending point of the cutting path, and in the pre-step and the post-step of excavation by the excavator, there is an operation of removing the cutting equivalent part in each retaining wall. For the purpose of enabling the excavator to easily cut the cutting equivalent part of the retaining wall, there is a method in which a retaining wall structural member having a composite is used as the retaining wall, and the composite part is positioned at the cutting equivalent part. This retaining wall structural member has a pair of H-shaped steel materials and a composite interposed therebetween. This composite is a composite in which inorganic fibers are mixed in a resin foam.

[0003] For example, Patent Document 1 discloses a retaining wall structural member having a composite, an H-shaped steel material, and an adhesive iron plate provided between the end of the composite and the end of the H-shaped steel material, a part of the adhesive iron plate being inserted into a groove at the end of the composite and adhesively fixed (adhesive joint part), and the exposed part of the adhesive steel plate being fixed to the end of the H-shaped steel material by mechanical fixing means. According to the retaining wall structural member of Patent Document 1, it is intended to ensure the joining strength between the H-shaped steel material and the composite with a simple configuration.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, the depth of the cutting range by the excavator varies according to the design of the construction target. For this reason, depending on the depth of the cutting range, problems as described below occur. As shown in Fig. 6(a), when the depth of the cutting range 14 by the tunneling machine is sufficiently deep, the earth retaining wall structure member 1 is driven into the ground so as to have a depth corresponding to the cutting range 14 in the earth retaining wall, and the earth retaining wall is formed. In this case, the H-shaped steel material 10 and the adhesive joint provided at the upper end of the core material 8 of the composite 22 are located underground. Then, the cutting range 14 where the core material 8 is located in the formed earth retaining wall is cut together with the core material 8.

[0006] However, when the depth of the cutting range by the tunneling machine is shallow, the protruding part above the ground must be cut off. For example, as shown in Fig. 6(b), when the depth of the cutting range 14 is shallow and the adhesive joint 22a protrudes above the ground, it is necessary to cut off the protruding adhesive joint 22a by gas cutting or the like. Also, for example, as shown in Fig. 6(c), when the depth of the cutting range 14 is shallow and the adhesive joint 22a is located within the cutting range 14, it is also necessary to cut off the adhesive joint 22a within the cutting range 14. That is, when the depth of the cutting range is shallow, the operation of cutting off the adhesive joints and steel materials of the earth retaining wall is added, which may become complicated. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an earth retaining wall structure member that can more easily perform the cutting process of the earth retaining wall.

Means for Solving the Problems

[0007] The present invention has the following aspects. <1> It has a core material and a suspension tool provided at the upper end of the core material, the core material is a composite in which inorganic fibers are mixed in a foamed resin, the suspension tool is an earth retaining wall structure member detachably joined to the core material. <2> The suspension tool is composed of two or more plate bodies, The retaining wall structure member according to <1>, wherein the hanging tool sandwiches the core material between the two or more plate bodies and is joined to the core material. <3> The retaining wall structure member according to <1>, wherein the hanging tool is joined to the upper end surface of the core material.

[0008] <4> A method for constructing a retaining wall using the retaining wall structure member according to any one of <1> to <3>, with the hanging tool in the vertically upward direction, burying the retaining wall structure member in the ground so that the core material is at a position including a desired cutting range, and then removing part or all of the hanging tool from the core material.

[0009] <5> A step of forming a retaining wall by the method for constructing a retaining wall according to <4>, and a cutting step of cutting the cutting range including the core material.

[0010] <6> Having a core material and a hanging tool provided at one end in the surface direction of the core material, wherein the core material is a composite in which inorganic fibers are mixed in a foamed resin, and the hanging tool is a composite in which inorganic fibers are mixed in a foamed resin. <7> The hanging tool is joined to the core material with bolts, and the bolts are composites in which inorganic fibers are mixed in a foamed resin.

[0011] <8> A method for constructing a retaining wall using the retaining wall structure member according to <6> or <7>, with the hanging tool in the vertically upward direction, burying the retaining wall structure member in the ground so that the core material is at a position including a desired cutting range.

[0012] <9> The step of forming a retaining wall by the method for constructing a retaining wall according to <8>; A ground cutting method, comprising: a cutting step of cutting the cutting range including the core material without removing the hanging tool from the core material.

Advantages of the Invention

[0013] The retaining wall structure member of the present invention can more easily perform the cutting step of the retaining wall.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0015] The retaining wall structure member of the present invention has a core material and a hanging tool provided at one end in the plane direction of the core material. Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0016] <First Embodiment> ≪Retaining Wall Structure Member≫ The retaining wall structure member of the present embodiment has a composite core material and a hanging tool provided at the upper end of the core material and detachably joined to the core material. The earth-retaining wall structural member 1a in Fig. 1 has a core material 8a and a suspension tool 10a provided at the upper end of the core material 8a. The upper end of the core material 8a is located vertically upward when the earth-retaining wall structural member 1a is buried in the ground. In the earth-retaining wall structural member 1a, a suspension tool or an H-shaped steel material is connected to the lower end of the core material 8a.

[0017] The core material 8a is a composite in which inorganic fibers are mixed in a foamed resin. Examples of the composite include a urethane foam reinforced with glass fibers. The composite may contain solid fillers such as silica sand, fly ash, and rubber chips. Also, a part of the composite may contain different materials such as rubber and resin sheets. Examples of the composite include Esron Neolumber FFU (FFU, Fiber reinforced Foamed Urethane, registered trademark, manufactured by Sekisui Chemical Co., Ltd.). Esron Neolumber FFU is a thermosetting resin foam in which long glass fibers are aligned in a predetermined direction (for example, the vertical direction of the core material 8a) and the long glass fibers are embedded in the thermosetting resin and cured.

[0018] The shape of the core material 8a is not particularly limited, and examples include a flat plate shape, a prismatic shape, and a cylindrical shape when viewed from the front. The density of the core material 8a is not particularly limited, and for example, 700 to 1600 kg / m 3 is preferable.

[0019] The suspension tool 10a is a member to which a hook of a crane or the like is attached when the earth-retaining wall structural member 1a is buried in the ground. In the present embodiment, the material of the suspension tool 10a is a metal such as steel or stainless steel.

[0020] The suspension tool 10a has two plate bodies 10a1. The plate bodies 10a1 are attached in a state of sandwiching the core material 8a. The pair of plate bodies 10a1 are detachably fixed to the core material 8a with bolts 11. Note that the suspension tool 10a may be composed of three or more plate bodies. Hanging holes 12 are formed in the plate bodies 10a1. Note that the suspension tool 10a may not have the hanging holes 12. The bolt 11 may or may not penetrate the core material 8a. Examples of the bolt 11 include a hexagonal bolt, a coach screw bolt, and the like.

[0021] Note that the suspension tool is not limited to the suspension tool 10a, and any tool that can be detachably fixed to the core material 8a with bolts or the like is acceptable. For example, like the earth-retaining wall structural member 1b in FIG. 2, the suspension tool may be a suspension tool 10b composed of three plate bodies. The earth-retaining wall structural member 1b has two core materials 8a facing each other, and at the upper ends of the two core materials 8a, a plate body 10b1 having a suspension hole 12 is sandwiched. The core material 8a is sandwiched by two plate bodies 10b2 from both sides of the plate body 10b1 so as to sandwich the plate body 10b1. That is, in the earth-retaining wall structural member 1b, the plate body 10b2, the core material 8a, the plate body 10b1, the core material 8a, and the plate body 10b2 are positioned in this order in the thickness direction, and these are detachably fixed with bolts 11. The plate body 10b1 is longer upward than the plate body 10b2 and protrudes from the core material 8a. The material of the suspension tool 10b is the same as that of the suspension tool 10a.

[0022] Also, for example, the earth-retaining wall structural member 1c in FIG. 3 has a suspension tool 10c joined to the upper end surface of the core material 8a. The suspension tool 10c has a plate body 10c2 in contact with the upper end surface of the core material 8a and a plate body 10c1 rising upward from the surface of the plate body 10c2. A suspension hole 12 is formed in the plate body 10c1. The plate body 10c1 and the plate body 10c2 are joined by welding or the like. The plate body 10c2 is detachably fixed to the core material 8a with bolts 11.

[0023] ≪Construction method of earth-retaining wall≫ Next, a method for constructing a retaining wall using the retaining wall structural member of the present embodiment will be described. First, if necessary, an H-shaped steel material is joined to the lower end of the core material 8a in the retaining wall structural member 1a. With the hoist 10a facing vertically upward, the hook 50 at the tip of a shackle, wire, nylon sling, etc. is hung on the suspension hole 12 of the hoist 10a of the retaining wall structural member 1a. When the hoist 10a does not have a suspension hole 12, instead of the hook 50, the hoist 10a may be grasped with an eagle clamp or the like.

[0024] Next, the retaining wall structural member 1a is lifted as a unit, and the retaining wall structural member 1a is buried in the ground so that the core material 8a is located at a desired depth and within the cutting range. When the depth of the cutting range is shallow, the hoist 10a of part or all of the retaining wall structural member 1a protrudes above the ground. Also, the hoist 10a of part or all of the retaining wall structural member 1a may be located within the cutting range. For this reason, the hoist 10a protruding above the ground is removed from the core material 8a. Also, the hoist 10a located within the cutting range is removed from the core material 8a. At this time, the hoist 10a is removed from the core material 8a by releasing the bolt 11. Similarly, in the retaining wall structural member 1b, the hoist 10b is removed from the core material 8a by releasing the bolt 11. Similarly, in the retaining wall structural member 1c, the hoist 10c is removed from the core material 8a by releasing the bolt 11. In this way, a retaining wall in which the core material 8a is located can be formed in the area including the cutting range.

[0025] ≪Underground cutting method≫ The underground cutting method of the present exemplary embodiment includes a step of forming a retaining wall by the above-described method for constructing a retaining wall (retaining wall forming step) and a cutting step of cutting a cutting range including a core material. Examples of the cutting step include known methods, such as a method of cutting with a tunneling machine.

[0026] In the ground cutting method of this embodiment, in the earth retaining wall forming step, in order to remove the suspension tool located in the cutting range, the cutting range is cut without complicated operations such as cutting the suspension tool by gas cutting or the like.

[0027] According to this embodiment, after embedding the earth retaining wall structural member, the suspension tool can be easily removed from the core material. For this reason, the suspension tool protruding above the ground after embedding can be easily removed, and the suspension tool located in the cutting range can be easily removed, so that the cutting process of the earth retaining wall can be carried out more simply.

[0028] <Second Embodiment> ≪Earth Retaining Wall Structural Member≫ The earth retaining wall structural member of this embodiment has a composite core material and a composite suspension tool provided at the upper end of the core material. Hereinafter, the same components as those in the first embodiment are denoted by the same reference numerals and their description is omitted, and mainly the differences from the first embodiment will be described. The earth retaining wall structural member 1d in FIG. 4 has a core material 8a and a suspension tool 10d provided at the upper end of the core material 8a.

[0029] The material of the suspension tool 10d is a composite. The composite constituting the suspension tool 10d may be the same as or different from the composite constituting the core material 8a.

[0030] The suspension tool 10d has two plate bodies 10d1. These plate bodies 10d1 are attached in a state of sandwiching the core material 8a. The pair of plate bodies 10d1 are fixed to the core material 8a with bolts 13. The suspension tool 10d may be detachably or non-detachably fixed to the core material 8a. Hanging holes 12 are formed in the plate bodies 10d1. Note that the suspension tool 10d may not have the hanging holes 12. The bolt 13 may or may not penetrate the core material 8a. Examples of the bolt 13 include a hexagonal bolt, a coach screw bolt, and the like. The material of the bolt 13 is not particularly limited, but a composite is preferred. If the bolt 13 is a composite, the cutting process can be performed more easily in the cutting process described later.

[0031] Note that the lifting tool is not limited to the lifting tool 10d, and any tool that can be joined to the core material 8a is acceptable. For example, like the retaining wall structural member 1e in FIG. 5, the lifting tool may be a lifting tool 10e composed of three plate bodies. The material of the lifting tool 10e is the same as that of the lifting tool 10d. The retaining wall structural member 1e has two core materials 8a facing each other, and at the upper ends of the two core materials 8a, a plate body 10d1 having a suspension hole 12 is sandwiched. The core material 8a is sandwiched by two plate bodies 10d2 from both sides of the plate body 10d1. That is, the retaining wall structural member 1b has a joint portion where the plate bodies 10d2, the core material 8a, the plate body 10d1, the core material 8a, and the plate body 10d2 are positioned in this order in the thickness direction and are fixed by bolts 13. In the retaining wall structural member 1e, the joint portion is composed of a composite. Further, at the joint portion, the plate bodies 10d1, 10d2 and the core material 8a may be further joined with an adhesive. The plate body 10d1 is longer upward than the plate body 10d2 and protrudes from the core material 8a.

[0032] Also, the lifting tool in the present embodiment may have the same configuration as the lifting tool 10c of the retaining wall structural member 1c in FIG. 3, for example.

[0033] ≪Construction method of retaining wall≫ Next, a method for constructing a retaining wall using the retaining wall structural member of the present embodiment will be described. First, if necessary, an H-shaped steel material is joined to the lower end of the core material 8a of the retaining wall structural member 1d. With the lifting tool 10d facing vertically upward, the retaining wall structural member 1d is lifted as a unit. Next, the retaining wall structural member 1a is buried in the ground so that the core material 8a is positioned within the cutting range at a desired depth. When the depth of the cutting range is shallow, the lifting tools 10d of some or all of the retaining wall structural members 1d protrude above the ground. In this case, since the lifting tool 10d is composed of a composite body, the lifting tool 10d can be easily cut as needed. Also, the lifting tools 10d of some or all of the retaining wall structural members 1a may be positioned within the cutting range. In this case, since the lifting tool 10d is composed of a composite body, the cutting process described later can be performed without removing the lifting tool 10d. The same applies to the retaining wall structural member 1e. In this way, a retaining wall with the core material 8a positioned in the area including the cutting range can be formed.

[0034] ≪Underground cutting method≫ The underground cutting method of the present exemplary embodiment includes a step of forming a retaining wall by the above-described method for constructing a retaining wall (retaining wall forming step) and a cutting step of cutting the cutting range including the core material. Examples of the cutting step include known methods, such as a method of cutting with a tunneling machine. In the present embodiment, since the lifting tool 10d has a composite structure, the cutting range in the ground can be cut without removing the lifting tool 10d from the core material 8a. In the present embodiment, if the bolt 13 is a composite body, it is easier to cut. Also, when cutting the cutting range, the lifting tool 10d may be removed from the core material 8a.

[0035] According to the underground cutting method of the present embodiment, since the core material and the lifting tool are composed of a composite body, the cutting range can be easily cut without removing the lifting tool positioned within the cutting range. Therefore, even when the depth of the cutting range is shallow from the ground surface, the ground can be easily cut without complicated operations.

Explanation of reference numerals

[0036] 1, 1a, 1b, 1c, 1d, 1e ··· retaining wall structural members 8, 8a ··· core materials 10a, 10b, 10c, 10d, 10e ··· hanging tools 11, 13 ··· bolts 14 ··· cutting range

Claims

1. A retaining wall structural member comprising a core material in the shape of a flat plate, a prism, or a cylinder, and a suspension tool provided at one end of the core material in the surface direction. The core material is made of a composite in which inorganic fibers are mixed in a foamed resin. The suspension tool is a composite in which inorganic fibers are mixed in a foamed resin. The suspension tool is joined to the core material with bolts. The bolts are composites in which inorganic fibers are mixed in a foamed resin.

2. A method for constructing a retaining wall using the retaining wall structural member according to Claim 1, comprising: burying one or more of the retaining wall structural members in the ground with the suspension tool facing vertically upward and the core material positioned to include a desired cutting range.

3. A method for cutting in the ground, comprising: a step of forming a retaining wall by the method for constructing a retaining wall according to Claim 2; and a cutting step of cutting the cutting range including the core material without removing the suspension tool from the core material.

Images