Member to be cut, group to be cut, and construction method of shaft wall

Abstract

To provide a member to be cut capable of improving adhesion strength between a wall material and a filling material.SOLUTION: A member to be cut 23 is for forming an area capable of being drilled in a part of a shaft wall. The member to be cut includes: wall materials 26A and 26B; and reinforcements 27A and 27B that are placed on a face 26aA in the wall materials 26A and 26B at one side Z1 in the thickness direction Z of the wall materials 26A and 26B.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a method for constructing a member to be cut, a group of members to be cut, and a shaft wall.

Background Art

[0002] Conventionally, as a tunneling method for subways, roads, utility tunnels, and sewers, etc., the shield method using a shield tunneling machine has been widely adopted. In the shield method, first, a shaft (launch shaft) serving as a vertical hole is formed by an excavation method. Then, the shield tunneling machine is used to excavate the excavation side surface of the launch shaft to advance horizontally. Here, in the shaft formed by the excavation method, from the viewpoints of preventing the collapse of the wall surface due to earth pressure and water pressure and ensuring safety during work, etc., the excavation wall surface is reinforced by the shaft wall (see, for example, Patent Document 1).

[0003] In Patent Document 1, a part of the shaft wall is a member to be cut having an excavable area that can be directly cut by a shield tunneling machine. The shaft wall configured in this way does not require the opening operation of the earth retaining wall by conventional machines or manual labor, and it is possible to safely and surely launch and reach the shield tunneling machine.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the excavable area, a filler formed of concrete or the like adheres to the wall material. However, there is a problem that the adhesion strength between the wall material and the filler is insufficient during cutting by the shield tunneling machine or the like, and the filler is displaced with respect to the wall material.

[0006] The present invention has been made in view of such problems, and an object thereof is to provide a cutting member having enhanced adhesion strength between a wall material and a filling material, a cutting group including the cutting member, and a method for constructing a shaft wall.

Means for Solving the Problems

[0007] In order to solve the above problems, the present invention proposes the following means. (1) Aspect 1 of the present invention is a cutting member for forming an excavable area in a part of a shaft wall, including a wall material and a reinforcing member provided on one surface of the wall material in the thickness direction of the wall material.

[0008] In the present invention, the shaft wall can withstand the pressure of the soil in which the shaft wall is embedded. For example, an excavable area formed in a part of the shaft wall can be cut by a shield tunneling machine. Since the reinforcing member is provided on the surface of the wall material, the contact area of the entire wall material and the reinforcing member with the filling material increases compared to the contact area of the wall material alone with the filling material. Therefore, the adhesion strength between the wall material and the filling material can be enhanced. Also, for example, the filling material can be filled into a space on one side in the thickness direction of the wall material.

[0009] (2) Aspect 2 of the present invention may be the cutting member according to (1), wherein the reinforcing member extends in a direction intersecting the inner surface of the excavable area. In the present invention, the contact area of the entire wall material and the reinforcing member with the filling material can be further increased.

[0010] (3) Aspect 3 of the present invention may be the cutting member according to (1) or (2), wherein the reinforcing member is a convex strip, and the convex strip extends along at least one of the one side and the other side in the thickness direction and along the surface. In the present invention, the reinforcing member for increasing the contact area with the filling material can be easily formed as a convex strip that extends along at least one of the one side and the other side in the thickness direction and along the surface.

[0011] (4)Aspect 4 of the present invention may be the work piece according to any one of (1) to (4), wherein a through hole is formed in the reinforcing member. In the present invention, for example, when a filler is filled on one side in the thickness direction with respect to the wall material, the filler enters the through hole of the reinforcing member, so that the adhesion strength between the reinforcing member and the filler can be increased.

[0012] (5)Aspect 5 of the present invention may be the work piece according to (3) or (4), wherein uneven portions are formed on the side surface or the tip of the rib. In the present invention, the contact area of the wall material and the entire reinforcing member with respect to the filler can be further increased by the uneven portions formed on the side surface or the tip of the rib.

[0013] (6)Aspect 6 of the present invention may be the work piece according to any one of (1) to (5), wherein each of the wall material and the reinforcing member is formed of glass fiber reinforced plastic. In the present invention, the wall material and the reinforcing member can be formed to be relatively lightweight and high-strength.

[0014] (7)Aspect 7 of the present invention may be the work piece according to any one of (1) to (6), comprising a pair of the wall materials and reinforcing bars provided at each end of the pair of wall materials. In the present invention, the filler can be reliably held between a pair of wall materials connected to each other via the reinforcing bars.

[0015] (8)Aspect 8 of the present invention may be the work piece according to any one of (1) to (7), comprising a filler filled on the one side in the thickness direction with respect to the wall material. In the present invention, a filler with enhanced adhesion strength to the wall material can be provided by the reinforcing member.

[0016] (9)Aspect 9 of the present invention is a group of workpieces to be cut, comprising a plurality of workpieces to be cut according to any one of (1) to (8), wherein the plurality of workpieces to be cut are arranged side by side along the inner surface of the excavable area. In this invention, by arranging a plurality of workpieces to be cut side by side, each workpiece to be cut can be used as a segment (section).

[0017] (10)Aspect 10 of the present invention is a method for constructing a shaft wall, which includes a first step of installing the shaft wall together with the workpiece to be cut according to any one of (1) to (9), and a second step of placing a filling material on one side in the thickness direction of the wall material. In this invention, in the first step, for the workpiece to be cut installed together with the shaft wall, in the second step, a filling material is placed. Thereby, a shaft wall provided with a workpiece to be cut with enhanced adhesion strength between the wall material and the filling material can be constructed.

Advantages of the Invention

[0018] In the workpiece to be cut, the group of workpieces to be cut, and the method for constructing a shaft wall of the present invention, the adhesion strength between the wall material and the filling material can be enhanced.

Brief Description of the Drawings

[0019]

Figure 1

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Figure 17

MODE FOR CARRYING OUT THE INVENTION

[0020] (First Embodiment) Hereinafter, a first embodiment of a work piece, a work piece group, and a construction method of a shaft wall according to the present invention will be described with reference to FIGS. 1 to 12. As shown in FIG. 1, the work piece group 20 of the present embodiment is used to form an excavable area 21 in a part of the shaft wall 1. In FIG. 1, the shaft wall main body 10 described later is shown by a two-dot chain line, and the work piece group 20 is shown in a simplified manner.

[0021] The shape of the shaft wall 1 is not limited. In this example, the shaft wall 1 is formed in a rectangular tube shape extending in the vertical direction. The shaft wall 1 includes a shaft wall main body 10 and a work piece group 20. The vertical shaft wall body 10 is a reinforced concrete wall with reinforcing bars (not shown) embedded inside the main body concrete 11. The vertical shaft wall body 10 is formed in a square tube shape and constitutes the basic shape of the vertical shaft wall 1. In the vertical shaft wall body 10, a through hole 10a penetrating the wall of the vertical shaft wall body 10 in the thickness direction of this wall is formed. For example, when viewed in the thickness direction, the through hole 10a has a rectangular shape. Note that the shape of the through hole when viewed in the thickness direction is not limited to a rectangular shape, and may be a polygon other than a rectangular shape, a circular shape, or the like.

[0022] The cut group 20 is formed in a wall shape that closes the through hole 10a of the vertical shaft wall body 10. As shown in FIGS. 2 to 4, the cut group 20 includes a plurality of cut members 23 and cut concrete (filler) 24. Each cut member 23 includes a pair of wall members 26A, 26B, a plurality of reinforcing members 27A, 27B, a plurality of reinforcing bars 28, and a plurality of connecting members 29A, 29B. In this embodiment, the configuration of the wall member 26A and the configuration of the wall member 26B are the same as each other. Therefore, the configuration of the wall member 26A is indicated by adding the capital letter "A" to the symbol number, or the number and small English letters. The configuration corresponding to the wall member 26A in the wall member 26B is indicated by adding the capital letter "B" to the same number as the symbol of the wall member 26A, or the number and small English letters. Thereby, overlapping explanations are omitted. For example, the plurality of reinforcing members 27A, 27B, the plurality of connecting members 29A, 29B, etc. each have the same configuration as each other.

[0023] Hereinafter, regarding directions such as the thickness direction and one side described later, explanations will be given based on the wall member 26A. For example, the wall member 26A is formed in a flat plate shape. In this example, the wall member 26A has a rectangular shape when viewed in the thickness direction Z of the wall member 26A (see FIG. 4). The wall member 26A is formed with the same number of through holes 26cA (see FIG. 2) as the number of the plurality of reinforcing bars 28. The plurality of through holes 26cA are arranged at intervals in the first direction X. Note that the shape of the wall member 26A is not limited to this. The wall member 26A is arranged along the outer surface 21a of the excavable region 21 (the outer surface of the concrete 24 to be cut). Here, when A is along B, it means that the angle formed by A and B is 30 degrees or less. It is more preferable that this formed angle is 15 degrees or less. For example, A corresponds to the wall member 26A and B corresponds to the outer surface 21a.

[0024] The plurality of reinforcing members 27A are provided on the surface 26aA on one side (first side) Z1 in the thickness direction Z of the wall member 26A (hereinafter, also simply referred to as one side Z1). It is preferable from the viewpoint of strength that the reinforcing member 27A is integrally formed with the wall member 26A. These may be laminated in the thickness direction Z by adhering a plurality of wall members to each other in the thickness direction Z, or by adhering a wall member and a reinforcing member in the thickness direction Z. Here, a first direction X and a second direction Y that are perpendicular to each other are defined along the surface 26aA. Among the thickness direction Z, the side opposite to the one side Z1 is referred to as the other side (second side) Z2 (hereinafter, also simply referred to as the other side Z2). Each reinforcing member 27A is a rib. Each reinforcing member 27A extends along the one side Z1 and the first direction X respectively. The one side Z1 is a direction intersecting the inner surface 21b of the excavable region 21 (the inner surface of the concrete 24 to be cut). The inner surface 21b of the excavable region 21 is a cutting surface by the shield tunneling machine D1 (see FIG. 1).

[0025] In this example, each reinforcing member 27A is formed over the entire length in the first direction X of the wall member 26A (see FIG. 4). The length of each reinforcing member 27A in the second direction Y is shorter than the length of each reinforcing member 27A in the thickness direction Z. Note that the reinforcing member may extend along the other side Z2 and the first direction X respectively. Among the plurality of reinforcing members, a part may extend along the one side Z1 and the first direction X respectively, and the remaining part may extend along the other side Z2 and the first direction X respectively.

[0026] As shown in Fig. 5, a plurality of through holes 27aA are formed in each reinforcing member 27A. The plurality of through holes 27aA penetrate each reinforcing member 27A in the second direction Y. In this example, each through hole 27aA has a circular shape when viewed in the second direction Y. The plurality of through holes 27aA are arranged side by side in the thickness direction Z and the first direction X, respectively. Note that the number of through holes 27aA formed in each reinforcing member 27A may be one, or the through holes 27aA may not be formed in each reinforcing member 27A.

[0027] The diameter of the through hole 27aA is preferably 10 to 100 mm. A reinforcing bar (rod) 28 may be inserted into the through hole 27aA, and a through hole for inserting the reinforcing bar 28 may be provided separately from the through hole 27aA in the reinforcing member 27A. Bending the end of the reinforcing bar is preferable because the end of the reinforcing bar can be efficiently locked in the through hole 27aA.

[0028] As shown in Fig. 2, the plurality of reinforcing members 27A are arranged at intervals in the second direction Y.

[0029] The thickness (length in the second direction Y) of the plurality of reinforcing members 27A is preferably 5 mm or more and 15 mm or less, and more preferably 15 mm from the viewpoint of the strength of the reinforcing member 27A. The height (length in the thickness direction Z) of the plurality of reinforcing members 27A is preferably 10 mm or more and 100 mm or less, and more preferably 30 mm in order to obtain the required adhesion strength. The angle at which the plurality of reinforcing members 27A extend from the surface 26aA of the wall member 26A is preferably 80° or more and 100° or less, and more preferably 90° to prevent air pockets in the concrete 24 to be cut. The pitch of the plurality of reinforcing members 27A in the second direction Y is preferably 100 mm or more and 200 mm or less. In order to maintain the fillability of the concrete 24 to be cut, the pitch is more preferably 50 mm.

[0030] As shown in FIGS. 2 to 4, each reinforcing bar 28 is formed in a rod shape. Each reinforcing bar 28 extends along the thickness direction Z. A male screw (not shown) is formed at the end of the other side Z2 of each reinforcing bar 28. The end of the other side Z2 of each reinforcing bar 28 is passed through the through hole 26cA of the wall member 26A. The end of the other side Z2 of each reinforcing bar 28 protrudes to the other side Z2 with respect to the wall member 26A. The wall member 26A is provided at the end of the other side Z2 of each reinforcing bar 28. Note that the number of reinforcing bars 28 provided in each machined member 23 may be one.

[0031] The connecting member 29A includes a plate 32A, a first nut 33A, and a second nut 34A. The plate 32A is formed in a frustum shape. Note that the shape of the plate is not limited to the frustum shape, and may be a rectangular parallelepiped shape like a plate. A through hole (reference numeral omitted) is formed in the plate 32A. The circular bottom surface of the plate 32A having a large diameter is in contact with the surface 26bA on the other side Z2 of the wall member 26A from the other side Z2 of the surface 26bA. The male screw of the reinforcing bar 28 is passed through the through hole of the plate 32A.

[0032] The nuts 33A and 34A are each formed in a cylindrical shape. Female screws that fit with the male screw of the reinforcing bar 28 are respectively formed on the inner surfaces of the nuts 33A and 34A. The first nut 33A is in contact with the circular top surface of the plate 32A having a small diameter from the other side Z2 of this top surface. The female screw of the first nut 33A is fitted with the male screw of the reinforcing bar 28. The second nut 34A is in contact with the surface 26aA of the wall member 26A from the one side Z1 of the surface 26aA. The female screw of the second nut 34A is fitted with the male screw of each reinforcing bar 28. The nuts 33A and 34A sandwich the wall member 26A and the plate 32A in the thickness direction Z.

[0033] Here, as shown in FIG. 2, a reference plane S1 orthogonal to the thickness direction Z is defined at the center of the reinforcing bar 28 in the thickness direction Z. The wall materials 26B, the plurality of reinforcing members 27B, the plurality of connecting members 29B, and the wall materials 26A, the plurality of reinforcing members 27A, and the plurality of connecting members 29A are each formed symmetrically with respect to the reference plane S1. That is, at each end of each reinforcing rib 28, a wall material 26A is provided at the end on the other side Z2, and a wall material 26B is provided at the end on one side Z1. The plurality of reinforcing members 27A and the plurality of reinforcing members 27B are arranged to face each other in the thickness direction Z with the concrete 24 to be cut therebetween.

[0034] Each of the wall materials 26A, 26B, the reinforcing members 27A, 27B, the plurality of reinforcing ribs 28, and the plurality of connecting members 29A, 29B included in the member 23 to be cut is formed of glass fiber reinforced plastic (GFRP). The elastic modulus of the glass fiber reinforced plastic is higher than that of other synthetic resins. Note that the member 23 to be cut may be formed of CFRP (Carbon Fiber Reinforced Plastics), concrete, glass long fiber reinforced plastic foam (FFU), or the like. For example, the member 23 to be cut is arranged such that the thickness direction Z is along the horizontal plane.

[0035] The concrete 24 to be cut can be filled on one side Z1 and the other side Z2 with respect to the wall materials 26A and 26B, respectively. The concrete 24 to be cut is filled on one side Z1 and the other side Z2 with respect to the wall materials 26A and 26B, respectively. That is, the concrete 24 to be cut is arranged to cover between the wall material 26A and the wall material 26B and the end portions of each reinforcing rib 28 that protrude outside the wall materials 26A and 26B in the thickness direction Z in the thickness direction Z. The surface on the other side Z2 of the concrete 24 to be cut and the surface on the other side Z2 of the plurality of reinforcing ribs 28 are flush. The surface on one side Z1 of the concrete 24 to be cut and the surface on one side Z1 of the plurality of reinforcing ribs 28 are flush. The plurality of members to be cut 23 are arranged side by side in the second direction Y along the inner surface 21b (outer surface 21a) of the excavable area 21. In this example, each member to be cut 23 includes the concrete to be cut 24, and in the cutting group 20, the concretes to be cut 24 included in each member to be cut 23 are integrated. That is, the plurality of members to be cut 23 are of the segmental type.

[0036] As shown in FIG. 1, when viewed in the thickness direction Z, the excavable area 21 has, for example, a circular shape corresponding to the shield tunneling machine D1. The excavable area 21 is formed at the central part of the cutting group 20. The cutting group 20 configured as described above has a rectangular shape corresponding to the through hole 10a of the shaft wall main body 10 when viewed in the thickness direction Z. The cutting group 20 is arranged in the through hole 10a of the shaft wall main body 10 and is integrated with the shaft wall main body 10.

[0037] It is preferable that the reinforcing bars of the shaft wall main body 10 extend into the concrete to be cut 24 of the portion other than the excavable area 21 in the cutting group 20. By configuring in this way, the bonding strength between the shaft wall main body 10 and the cutting group 20 can be increased. The shaft wall 1 is buried in soil (ground).

[0038] Next, a construction method of the shaft wall for constructing the shaft wall 1 configured as described above in soil will be described. FIG. 6 is a flowchart showing a construction method of the shaft wall (hereinafter, also simply referred to as the construction method) S11. First, in the first step (step S16 shown in FIG. 6), the shaft wall 1 is installed together with the members to be cut 23. That is, the plurality of members to be cut 23 and the shaft wall main body 10 are installed. At this time, it is preferable that the reinforcing bars (not shown) arranged in the shaft wall main body 10 extend outward beyond the through hole 10a and are arranged in the vicinity of the members to be cut 23. When the first step S16 is completed, the process proceeds to step S17.

[0039] Next, in the second step S17, the concrete to be cut 24 is placed on one side Z1 or the like of the wall material 26A. At this time, for example, a plurality of members to be cut 23 are arranged so as to be sandwiched in the thickness direction Z by a pair of formworks (not shown). When concrete is poured between the pair of formworks, the portions of the reinforcing bars that are arranged in the vicinity of the plurality of members to be cut 23 are embedded in the concrete. When this concrete dries, it becomes the concrete to be cut 24, and the group of members to be cut 20 is constructed. The group of members to be cut 20 becomes integral with the shaft wall body 10. When the second step S17 is completed, all the steps of the construction method S11 are completed, and the shaft wall 1 is constructed.

[0040] As described above, in the member to be cut 23 of the present embodiment, the shaft wall 1 made of reinforced concrete can withstand the pressure of the soil in which the shaft wall 1 is embedded. For example, the excavable area 21 formed in a part of the shaft wall 1 can be cut by the shield excavator D1. Since the reinforcing member 27A is provided on the surface 26aA of the wall material 26A, the contact area of the wall material 26A and the reinforcing member 27A as a whole with the concrete to be cut 24 increases compared to the contact area of the wall material 26A alone with the filling material. In other words, the reinforcing member 27A is embedded in the concrete to be cut 24. Therefore, the adhesion strength between the wall material 26A and the concrete to be cut 24 can be increased. Also, for example, the space on one side Z1 with respect to the wall material 26A can be filled with the concrete to be cut 24.

[0041] The reinforcing member 27A extends to one side Z1 that intersects the inner surface 21b of the excavable area 21. Therefore, the contact area of the wall material 26A and the reinforcing member 27A as a whole with the concrete to be cut 24 can be further increased. The reinforcing member 27A can withstand the displacement of the concrete to be cut 24 in the first direction X and the second direction Y. The reinforcing member 27A is a rib. Thereby, the reinforcing member 27A that increases the contact area with the concrete to be cut 24 can be easily formed as a rib that extends along one side Z1 and the first direction X, respectively.

[0042] Each of the wall member 26A, the reinforcing member 27A, the plurality of reinforcing bars 28, and the plurality of connecting members 29A is formed of glass fiber reinforced plastic (glass fiber reinforced resin). Therefore, these members can be formed to be relatively lightweight and high-strength. These members can withstand water pressure and earth pressure and are excellent in durability. The member to be cut 23 includes wall members 26A, 26B and reinforcing bars 28. Therefore, the concrete to be cut 24 can be reliably held between a pair of wall members 26A and 26B connected to each other via the reinforcing bars 28.

[0043] The member to be cut 23 includes the concrete to be cut 24. Therefore, the concrete to be cut 24 with enhanced adhesion strength to the wall member 26A can be provided by the reinforcing member 27A. In addition, the group of members to be cut 20 in the present embodiment includes a plurality of members to be cut 23 arranged side by side along the inner surface 21b of the excavable area 21. By arranging the plurality of members to be cut 23 side by side, each member to be cut 23 can be used as a segment.

[0044] A plurality of through holes 27aA are formed in the reinforcing member 27A. Therefore, for example, when the concrete to be cut 24 is filled on one side Z1 with respect to the wall member 26A, the concrete to be cut 24 enters the through holes 27aA of the reinforcing member 27A, so that the adhesion strength between the reinforcing member 27A and the concrete to be cut 24 can be enhanced.

[0045] In the construction method S11 of the present embodiment, in the first step S16, the concrete to be cut 24 is placed in the second step S17 with respect to the plurality of members to be cut 23 installed together with the shaft wall 1. Thereby, the shaft wall 1 including the plurality of members to be cut 23 with enhanced adhesion strength between the wall member 26A and the concrete to be cut 24 can be constructed.

[0046] The configuration of the member to be cut 23 of the present embodiment can be variously deformed as described below. As shown in Fig. 7, uneven portions 41A may be formed on the side surface 40aA of the reinforcing member 40A which is a rib extending in one side Z1. For example, the side surface 40aA is a surface facing the second direction Y in the reinforcing member 40A. The uneven portions 41A have a concave portion 42A and a convex portion 43A. The concave portion 42A and the convex portion 43A each extend in the thickness direction Z and are alternately arranged in the first direction X. The concave portion 42A is recessed in the second direction Y, and the convex portion 43A protrudes in the second direction Y. The difference in the position in the second direction Y between the concave portion 42A and the convex portion 43A is preferably 0.1 times or more and 1 time or less the thickness (the length in the second direction Y) of the reinforcing member 40A.

[0047] By configuring as in this first modification example, the contact area with the cut concrete 24 of the entire wall material 26A and the reinforcing member 40A can be further increased by the uneven portions 41A. Note that the uneven portions may be formed at the tip (the end in the thickness direction Z) of the reinforcing member 27A which is a rib.

[0048] In each configuration of the cut member 23, like the cut member 50 shown in Figs. 8 and 9, a plurality of reinforcing members 51A may be provided instead of the plurality of reinforcing members 27A. Each reinforcing member 51A is formed in a block shape and has a longer length in the second direction Y than the reinforcing member 27A.

[0049] In each configuration of the cut member 23, like the cut member 55 shown in Fig. 10, a plurality of reinforcing members 56A may be provided instead of the plurality of reinforcing members 27A. Each reinforcing member 56A is formed in a rod shape and extends in the thickness direction Z. A stud or the like is used as each reinforcing member 56A. For example, the plurality of reinforcing members 56A are arranged on the surface 26aA of the wall material 26A at intervals in the first direction X and the second direction Y. In this third modification example, the plurality of reinforcing members 56A are also provided on the surface 26bA of the wall material 26A.

[0050] The diameter of the plurality of reinforcing members 56A is preferably 1 mm or more and 10 mm or less, and more preferably 5 mm from the viewpoint of the strength of the reinforcing member 56A. The height (length in the thickness direction Z) of the plurality of reinforcing members 56A is preferably 10 mm or more and 50 mm or less, and more preferably 30 mm in order to obtain the required adhesion strength. The angle at which the plurality of reinforcing members 56A extend from the surface 26aA of the wall member 26A is preferably 80° or more and 100° or less, and more preferably 90° to prevent air pockets in the concrete 24 to be cut. The pitch of the plurality of reinforcing members 56A in the first direction X and the second direction Y is preferably 25 mm or more and 80 mm or less. In order to maintain the fillability of the concrete 24 to be cut, the pitch is more preferably 50 mm.

[0051] In each configuration of the workpiece 55 of the third modification, like the workpiece 60 shown in FIGS. 11 and 12, a plurality of connecting members 61A may be provided instead of the plurality of connecting members 29A. Each connecting member 61A includes only the second nut 34A. In the workpiece 60, each reinforcing bar 28 does not protrude to the other side Z2 beyond the wall member 26A. The end face of each reinforcing bar 28 on the other side Z2 is flush with the surface 26bA of the wall member 26A. The second nut 34A is fixed to the wall member 26A by adhesion or the like and is fitted with the male screw of each reinforcing bar 28. In this fourth modification, the reinforcing member 56A is not provided on the surface 26bA of the wall member 26A.

[0052] The workpieces 50, 55, and 60 configured as described above can also achieve the same effects as the workpiece 23 of the present embodiment.

[0053] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. 13 to 17. The same parts as those in the above embodiment are denoted by the same reference numerals and their description is omitted, and only the different points will be described. As shown in FIGS. 13 and 14, the workpiece 65 of this embodiment includes a plurality of reinforcing bars 66 instead of the plurality of connecting members 29A and 29B in each configuration of the workpiece 23 of the first embodiment. In FIG. 13, the concrete to be cut 24 is shown by a two-dot chain line. Note that the number of the reinforcing members 27A included in the workpiece 65 may be one, and the number of the reinforcing bars 66 included in the workpiece 65 may be one.

[0054] In this embodiment, a plurality of through holes 27aA are formed in the reinforcing member 27A. The plurality of through holes 27aA penetrate the reinforcing member 27A in the second direction Y. In this example, each through hole 27aA has a circular shape when viewed in the second direction Y. The plurality of through holes 27aA are arranged at intervals in the first direction X. Note that the shape of the through hole 27aA when viewed in the second direction Y is not limited to a circular shape. The number of the through holes 27aA formed in the reinforcing member 27A is not limited and may be one.

[0055] The reinforcing bar 66 has a reinforcing body 67 and a pair of first reinforcing pieces (reinforcing pieces) 68. The reinforcing body 67 extends in the thickness direction Z. Each first reinforcing piece 68 extends from an end portion of the reinforcing body 67 in the thickness direction Z toward one side (a predetermined direction; downward) in the second direction Y. At least a part of each first reinforcing piece 68 is respectively arranged in the through hole 27aA of the reinforcing member 27A and the through hole 27aB of the reinforcing member 27B. As shown in FIG. 14, the angle θ1 formed between the reinforcing body 67 and the first reinforcing piece 68 is preferably 70 degrees or more and less than 110 degrees. In this example, for example, the angle θ1 is 90 degrees.

[0056] In this way, the reinforcing bar 66 is attached to the reinforcing members 27A and 27B. The statement "the reinforcing bar 66 is attached to the reinforcing members 27A and 27B" as used herein means not only that the reinforcing bar 66 is directly attached to the reinforcing members 27A and 27B without an intervening member, but also that the reinforcing bar 66 is attached to the reinforcing members 27A and 27B via an intervening member. For example, the reinforcing body 67 and the pair of first reinforcing pieces 68 of the reinforcing bar 66 are integrally formed of glass fiber reinforced plastic.

[0057] The shaft wall using the machined member 65 configured as described above is constructed as follows, for example. In the construction method of the shaft wall of the first embodiment, in the first step, a formwork (not shown) is arranged on the shaft wall main body 10. Then, a wall material 26A provided with a reinforcing member 27A and a wall material 26B provided with a reinforcing member 27B are attached to the formwork. The pair of first reinforcing pieces 68 of the reinforcing bar 66 are respectively passed through the through holes 27aA of the reinforcing member 27A and the through holes 27aB of the reinforcing member 27B. The cut concrete 24 is placed between the wall material 26A and the wall material 26B to construct the shaft wall (second step).

[0058] As described above, in the machined member 65 of the present embodiment, the adhesion strength between the wall material 26A and the cut concrete 24 can be increased. Furthermore, compared with the case where the pair of first reinforcing pieces 68 of the reinforcing bar 66 are not arranged in the through holes 27aA and 27aB of the reinforcing members 27A and 27B, the connection strength between the reinforcing members 27A and 27B and the reinforcing bar 66 can be increased.

[0059] The angle θ1 formed by the reinforcing body 67 and the first reinforcing piece 68 is preferably 70 degrees or more and less than 110 degrees. By configuring as in the machined member 65 of the present embodiment, when the reinforcing member 27A is attached to the connection portion between the reinforcing body 67 and the first reinforcing piece 68, it is possible to make it difficult for the reinforcing bar 66 to come off from the reinforcing member 27A. There may be a case where the angle θ1 formed by the reinforcing body 63 and the reinforcing piece 64 is preferably 70 degrees or more and less than 110 degrees. In this example, for example, the angle θ1 is 90 degrees. In this case, by configuring as in the composite member 61 of the present embodiment, when the rib member 23A is attached to the connection portion between the reinforcing body 63 and the first reinforcing piece 64, it is possible to make it difficult for the reinforcing bar 62 to come off from the rib member 23A.

[0060] The work member 65 of the present embodiment can be variously deformed in its configuration as described below. The work member 75 of the first modification example shown in FIG. 15 includes a plurality of reinforcing ribs 76 instead of the plurality of reinforcing ribs 66 in each configuration of the work member 65. The reinforcing rib 76 has a pair of second reinforcing pieces 69 in addition to each configuration of the reinforcing rib 66. Each second reinforcing piece 69 extends so as to approach each other from one end portion (lower end portion) in the second direction Y of each first reinforcing piece 68. The length of the second reinforcing piece 69 is less than half of the length of the reinforcing main body 67. The angle θ2 formed between the first reinforcing piece 68 and the second reinforcing piece 69 is preferably 70 degrees or more and less than 110 degrees. In this example, for example, the angle θ2 is 90 degrees. By configuring as the work member 75 of the first modification example, it is possible to make it difficult for the reinforcing rib 76 to come off from the reinforcing members 27A and 27B.

[0061] The work member 80 of the second modification example shown in FIG. 16 has a fastener 81 in addition to each configuration of the work member 65. In the work member 80 of the second modification example, it is preferable that a male screw (not shown) is formed on the outer peripheral surface of the first reinforcing piece 68. As the fastener 81, a nut or the like formed of glass fiber reinforced plastic can be used. The fastener 81 is disposed on one side (lower side) in the second direction Y with respect to the convex rib member 23A and is fitted to the male screw of the first reinforcing piece 68. The diameter of the through hole 27aA of the reinforcing member 27A is preferably smaller than the outer diameter of the fastener 81. By configuring as the work member 80 of the second modification example, compared with the work member 65, the length of the reinforcing rib 66 can be shortened, and the manufacturing cost of the reinforcing rib 66 can be reduced. It is possible to make it difficult for the reinforcing rib 66 to come off from the reinforcing members 27A and 27B.

[0062] The work member 85 of the third modification example shown in FIG. 17 includes locking members 86A and 86B in addition to each configuration of the work member 65. For example, the locking member 86A is formed in a rod shape from glass fiber reinforced plastic. The locking member 86A is arranged so as to extend in the second direction Y. The locking member 86A is passed through the through hole 27aA of the reinforcing member 27A and fixed to the reinforcing member 27A. The locking member 86A is spaced apart from the wall member 26A on one side Z1. The locking member 86A protrudes from one side (lower side) of the second direction Y and the other side (upper side) of the second direction Y with respect to the reinforcing member 27A, respectively.

[0063] The first reinforcing piece 68 arranged on the other side Z2 of the reinforcing rib 66 is arranged on the reinforcing member 27A and locks to the locking member 86A from the other side Z2 of the locking member 86A. Similarly, The first reinforcing piece 68 arranged on one side Z1 of the reinforcing rib 66 is arranged on the reinforcing member 27B and locks to the locking member 86B from one side Z1 of the locking member 86B. The machined member 85 of the third modification configured as described above can also achieve the same effects as the machined member 65 of the present embodiment.

[0064] As described above, the first embodiment, the second embodiment, and their modifications of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments and their modifications, and includes configuration changes, combinations, deletions, etc. within the scope not departing from the gist of the present invention. Furthermore, it goes without saying that the configurations shown in each embodiment and their modifications can be used in appropriate combinations. For example, in the above embodiments and modifications, the filler is not limited to the concrete to be cut 24, and mortar or the like may be used. The through holes 27aA and 27aB may not be formed in the reinforcing members 27A and 27B. The machined member 23 or the like may not include the wall member 26B, the reinforcing rib 28, the connecting member 29B, and the concrete to be cut 24. The main body concrete is not limited to being made of reinforced concrete, and may be made of concrete or the like.

Explanation of Reference Numerals

[0065] 1 Shaft wall 20 Cut group 21 Excavable area 21b Inner surface 23, 50, 55, 60, 65, 75, 80, 85 Cut members 24 Cut concrete (filling material) 26A, 26B Wall materials 26aA surface 27aA, 27aB Through holes 27A, 27B, 40A, 51A Reinforcing members 28, 66, 76 Reinforcing bars 41A Concave-convex part S11 Construction method (construction method of shaft wall) S16 First process S17 Second process Z Thickness direction Z1 One side

Claims

1. A cut member for forming an excavable area in a part of a shaft wall, Wall materials and A reinforcing member provided on one surface of the wall material in a thickness direction of the wall material; The workpiece is provided with:

2. The cuttable member according to claim 1 , wherein the reinforcing member extends in a direction intersecting an inner surface of the excavable area.

3. The reinforcing member is a protruding strip, The cut member according to claim 1 or 2, wherein the convex ridge extends along at least one of the one side and the other side in the thickness direction and along the surface.

4. The cut member according to claim 1 or 2, wherein the reinforcing member has a through hole formed therein.

5. The cut workpiece according to claim 3 , wherein the ridge has a side surface or a tip portion formed with an uneven portion.

6. The cut member according to claim 1 or 2, wherein the wall material and the reinforcing member are each formed of glass fiber reinforced plastic.

7. The pair of wall materials; The pair of wall materials each have a reinforcing bar at each end thereof; The workpiece according to claim 1 or 2, comprising:

8. The cut member according to claim 1 , further comprising a filler material filled on said one side in the thickness direction of said wall material.

9. A cutting tool according to claim 1 or 2 is provided, The plurality of cut members are arranged in a line along the inner surface of the excavable area, forming a cut group.

10. A first step of installing the shaft wall together with the workpiece according to claim 1 or 2; A second step of pouring a filler material onto the one side of the wall material in the thickness direction; This is a method for constructing shaft walls.

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