Composite member, and construction method of composite segment

Abstract

To provide a composite member capable of preventing a reinforcement member from protruding outward.SOLUTION: A composite member 21 is for forming an area capable of being drilled in part of a buried structure to be buried in the ground. The composite member includes: a resin wall material 22A for forming an area capable of being drilled; and a reinforcement member 24 attached to the wall material 22A. The reinforcement member 24 is placed on a reference plane S1 in the wall material 22A, which includes the outer periphery of a first surface 22aA facing in the thickness direction Z of the wall material 22A, or a second surface 22bA side facing the thickness direction Z of the wall material 22A, compared to the reference plane S1.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a construction method for synthetic members and synthetic segments.

Background Art

[0002] Conventionally, a construction method for constructing buried structures such as vertical shafts underground is known. In this construction method, a ring body formed by connecting a plurality of arc-shaped segments in a ring shape is pressed into the ground while being stacked in the vertical direction to construct a buried structure. After the construction of the buried structure, a horizontal shaft branched in a direction different from the axial direction of the buried structure may be constructed by a shield tunneling machine or the like. Therefore, the segments (synthetic segments) in the excavable area, which is a part of the buried structure excavated by the shield tunneling machine, have a different configuration from the segments in the non-excavated part.

[0003] Conventionally, as a segment in the excavable area, there is known one having a urethane resin foam reinforced with glass long fibers as an excavable material and a metal reinforcing plate member covering the inner surface of the urethane resin foam (Patent Document 1).

[0004] By the way, when excavating a branched horizontal shaft after the construction of the buried structure, in the synthetic segment described in Patent Document 1, it is necessary to expose the urethane resin foam. Therefore, it is necessary to remove the metal reinforcing plate covering the inner surface of the synthetic segment. The reinforcing plate is formed of a thick steel plate to receive the external force applied to the synthetic segment during press-fitting. Therefore, the reinforcing plate has to be cut by gas welding, and the work burden of separating the reinforcing plate from the synthetic segment was large.

[0005] Therefore, in Patent Document 2, the composite segment is configured to include a resin outer member (wall material) that forms the outer wall of the caisson (buried structure), a resin inner piece (wall material) that forms the inner wall, and a fill material provided between the outer member and the inner piece. This makes it easy to perform excavation work on the caisson when excavating an access tunnel. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2006-225929 A [Patent Document 2] JP 2020-117919 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, in the case of Patent Document 2, when the caisson assembled on the ground is sunk, the rods (reinforcing members) in the caisson protrude into the natural ground. This causes the rods to get caught in the surrounding ground, making it difficult to control the sinking of the composite segment (installation in the ground). In addition, the composite segment before being filled with a filler material such as concrete constitutes a composite member.

[0008] The present invention has been made in consideration of such problems, and has an object to provide a composite member and a method of installing a composite segment in which the reinforcing member is prevented from protruding outward. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention proposes the following means. (1)Aspect 1 of the present invention is a synthetic member for forming an excavable region in a part of an embedded structure buried in the ground, comprising a resin wall member for forming the excavable region and a reinforcing member attached to the wall member. The reinforcing member is disposed on a reference plane including the outer peripheral edge of a first surface facing the thickness direction of the wall member in the wall member, or on the second surface side of the wall member facing the thickness direction, rather than the reference plane. In this invention, an excavable region is formed by a synthetic member in a part of an embedded structure buried in the ground. Therefore, the excavable region can be excavated by a shield tunneling machine or the like. Further, the reinforcing member is disposed on the reference plane in the wall member or on the second surface side rather than the reference plane. Therefore, by disposing the synthetic member so that the reference plane is on the outer side of the synthetic member, it is possible to suppress the reinforcing member from protruding to the outside.

[0010] (2)Aspect 2 of the present invention may be the synthetic member according to (1), which includes a fastener attached to the reinforcing member and covering a part of the reinforcing member. In this invention, the reinforcing member can be more securely attached to the wall member by the fastener.

[0011] (3)Aspect 3 of the present invention may be the synthetic member according to (2), which includes a connecting member disposed between the wall member and the fastener and having an outer diameter larger than that of the fastener. In this invention, the force acting on the fastener can be more dispersed and transmitted to the wall member by the connecting member.

[0012] (4)Aspect 4 of the present invention may be the synthetic member according to (2) or (3), wherein the fastener is disposed on the second surface side of the wall member with respect to the reference plane. In this invention, for example, by disposing the synthetic member so that the reference plane is on the outer side of the synthetic member, it is possible to more surely suppress the fastener from protruding to the outside.

[0013] (5) Aspect 5 of the present invention may be the composite member according to any one of (1) to (4), comprising a rib member provided on the second surface of the wall material. In this invention, for example, when filling a filler on the second surface side of the wall material, the contact area of the entire wall material and rib member with respect to the filler increases compared to the contact area of the wall material alone with the filler. Therefore, the adhesion strength between the wall material and the filler can be enhanced.

[0014] (6) Aspect 6 of the present invention may be the composite member according to (3), wherein at least one of the reinforcing member and the connecting member is made of resin. In this invention, at least one of the reinforcing member and the connecting member can be more reliably excavated by a shield tunneling machine or the like.

[0015] (7) Aspect 7 of the present invention may be the composite member according to (3), wherein at least one of the reinforcing member and the connecting member is made of glass fiber reinforced resin. In this invention, at least one of the reinforcing member and the connecting member can be formed to be relatively lightweight and high-strength, and can be more reliably excavated by a shield tunneling machine or the like.

[0016] (8) Aspect 8 of the present invention may be the composite member according to any one of (1) to (7), wherein the arrangement density of the reinforcing member in the direction along the horizontal plane in the excavable region gradually decreases as it moves away from the centroid of the excavable region in the direction along the horizontal plane.

[0017] (9) Aspect 9 of the present invention is a composite member for forming an excavable region in a part of an embedded structure buried in the ground, comprising a resin-made wall material for forming the excavable region, a rib member provided on the second surface of the wall material, which is opposite to the first surface facing the thickness direction of the wall material, and a reinforcing member attached to the rib member, wherein the reinforcing member is arranged on a reference plane including the outer peripheral edge of the first surface of the wall material or on the second surface side of the reference plane. In the present invention, an excavable region is formed by a synthetic member in a part of an embedded structure embedded in the ground. Therefore, the excavable region can be excavated by a shield tunneling machine or the like. Further, a reinforcing member can be attached to a rib member provided on the wall material. The reinforcing member is disposed on the reference plane of the wall material or on the second surface side with respect to the reference plane. Therefore, by disposing the synthetic member so that the reference plane is on the outer side of the synthetic member, it is possible to suppress the reinforcing member from protruding to the outside.

[0018] (10)Aspect 10 of the present invention may be the synthetic member according to (9), wherein the reinforcing member has a reinforcing body extending in the thickness direction and a reinforcing piece extending in a predetermined direction from an end of the reinforcing body, and an angle formed by the reinforcing body and the reinforcing piece is 70 degrees or more and less than 110 degrees. In the present invention, when a rib member is attached to the connection portion between the reinforcing body and the reinforcing piece, it is possible to make it difficult for the rib member to come off from this connection portion.

[0019] (11)Aspect 11 of the present invention is a method for constructing a synthetic segment, which includes a first step of installing the synthetic member according to any one of (1) to (10), and a second step of placing a filling material on the second surface side with respect to the first surface of the wall material to construct a synthetic segment. In the present invention, a synthetic segment can be constructed using a synthetic member in which the protrusion of the reinforcing member to the outside is suppressed.

Advantages of the Invention

[0020] In the synthetic member of the present invention, it is possible to suppress the reinforcing member from protruding to the outside.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0022] (First Embodiment) Hereinafter, a first embodiment of a method for constructing a composite member and a composite segment according to the present invention will be described with reference to FIGS. 1 to 8, taking the case where the buried structure in which this composite member is used is a caisson as an example. As shown in FIG. 1, for example, the caisson 1 is formed in a bottomed rectangular tube shape extending in the vertical direction. Note that in FIG. 1, the bottom concrete of the caisson 1 is not shown. The shape of the caisson 1 is not limited to this. The caisson 1 is buried in the ground G. The caisson 1 includes a wall body 10 and a composite segment 20. The wall body 10 is a reinforced concrete wall in which reinforcing bars 12 are embedded inside the main body concrete 11. The wall body 10 is formed in a rectangular tube shape and constitutes the basic shape of the caisson 1. As shown in Fig. 3, in the wall body 10, a through hole (notch) 10a is formed that penetrates the wall of the wall body 10 in the thickness direction of this wall. For example, when viewed in the thickness direction, the through hole 10a has a rectangular shape. Note that in Fig. 3, only the reinforcing bars 24 of the synthetic member 21 described later are shown. Note that the shape of the through hole 10a is not limited to this.

[0023] As shown in Fig. 1, for example, the wall body 10 is integrally formed by a first portion 15 that is a portion below the through hole 10a and a second portion 16 that is a portion of the wall body 10 other than the first portion 15. Excluding the bottom concrete, the first portion 15 is formed in a square tube shape. The lower end portion of the first portion 15 is a blade portion 15a that gradually becomes thinner as it goes downward. The second portion 16 has a C shape when viewed in the vertical direction.

[0024] As shown in Figs. 1 and 2, the synthetic segment 20 is formed in a wall shape that closes the through hole 10a of the wall body 10. As shown in Fig. 2, the synthetic segment 20 includes a plurality of synthetic members 21 of this embodiment and the cut concrete (filler) 31. Note that the number of synthetic members 21 included in the synthetic segment 20 may be one. The synthetic member 21 is a member for forming a later-described excavable region 33 (see Fig. 3) in a part of the caisson 1. The synthetic member 21 includes wall materials 22A, 22B, a plurality of rib members 23A, 23B, a plurality of reinforcing bars (reinforcing members) 24, nuts (fasteners) 25A, 25B, and plates (connecting members) 26A, 26B. In this embodiment, the configuration of the wall material 22A and the configuration of the wall material 22B are the same as each other. For this reason, the configuration of the wall material 22A 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 material 22A in the wall material 22B is indicated by adding the capital letter "B" to the same number as the symbol of the wall material 22A, or the number and small English letters. Thereby, overlapping explanations are omitted. The same applies to the rib members 23A, 23B, the nuts 25A, 25B, etc.

[0025] Hereinafter, regarding directions such as the thickness direction and one side described later, the description will be based on the wall member 22A. For example, the wall member 22A is formed in a flat plate shape. In this example, the wall member 22A has a rectangular shape when viewed in the thickness direction Z of the wall member 22A. Note that the shape of the wall member 22A is not limited to this. A plurality of through holes 22cA corresponding to the plurality of reinforcing bars 24 are formed in the wall member 22A.

[0026] Here, in the wall member 22A, a first surface 22aA facing one side (first side) Z1 in the thickness direction Z (hereinafter, also simply referred to as one side Z1) is defined. The first surface 22aA has a rectangular shape when viewed in the thickness direction Z. A first reference surface (reference surface) S1 including the outer peripheral edge of the first surface 22aA is defined. In the wall member 22A, a second surface 22bA facing the other side (second side) Z2 opposite to the one side Z1 in the thickness direction Z (hereinafter, also simply referred to as the other side Z2) is defined. The second surface 22bA is the surface opposite to the first surface 22aA in the wall member 22A. The first surface 22aA and the second surface 22bA each face the thickness direction Z.

[0027] The plurality of rib members 23A are provided on the second surface 22bA of the wall member 22A. Here, a first direction X and a second direction Y orthogonal to each other are defined along the second surface 22bA. Each rib member 23A extends along the other side Z2 and the first direction X, respectively. Here, that A is along B 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 rib member 23A and B corresponds to the other side Z2. The plurality of rib members 23A are arranged at intervals in the second direction Y. Note that the number of rib members 23A provided in the composite member 21 may be one. The plurality of rib members 23A are arranged so as to avoid the nut 25A and the plate 26A.

[0028] The reinforcing bar 24 is formed in a rod shape. The reinforcing bar 24 extends along the thickness direction Z. A male screw (not shown) is formed at the end of one side Z1 of the reinforcing bar 24. The end of one side Z1 of the reinforcing bar 24 is passed through the through hole 22cA of the wall member 22A. The reinforcing bar 24 is arranged above the first reference plane S1 or on the second surface 22bA side rather than the reference plane S1. In this example, the reference plane S1 and the end face of one side Z1 of the reinforcing bar 24 are flush. The reinforcing bar 24 extends from the reference plane S1 toward the other side Z2. Note that the number of reinforcing bars 24 provided in the composite member 21 may be one.

[0029] The nut 25A is formed in a cylindrical shape. Female screws that fit with the male screw of the reinforcing bar 24 are respectively formed on the inner surface of the nut 25A. The nut 25A is fixed to the peripheral edge of the through hole 22cA on the second surface 22bA of the wall member 22A by an adhesive or the like. The nut 25A is arranged on the second surface 22bA side of the wall member 22A with respect to the first reference plane S1. The nut 25A protrudes from the second surface 22bA of the wall member 22A toward the other side Z2. The female screw of the nut 25A is fitted with the male screw of the reinforcing bar 24. The plate 26A is formed in a frustum of a cone shape. A through hole (reference numeral omitted) is formed in the plate 26A. The outer diameter of the plate 26A is shorter than the lengths in the first direction X and the second direction Y of the wall member 22A respectively. The outer diameter of the plate 26A is larger than the outer diameter of the nut 25A. The circular bottom surface of the plate 26A with a large outer diameter contacts the second surface 22bA of the wall member 22A from the other side Z2 of the second surface 22bA. The nut 25A is passed through the through hole of the plate 26A. The plate 26A is fixed to the wall member 22A and the nut 25A by an adhesive or the like.

[0030] Here, as shown in FIG. 2, a second reference plane S3 perpendicular to the thickness direction Z is defined at the center of the reinforcing bar 24 in the thickness direction Z. The wall members 22B, the plurality of rib members 23B, the nuts 25B, the plates 26B, and the wall members 22A, the plurality of rib members 23A, the nuts 25A, and the plates 26A are each formed symmetrically with respect to the second reference plane S3. That is, in the reinforcing bar 24, a wall member 22A is provided at an end on one side Z1, and a wall member 22B is provided at an end on the other side Z2. The plurality of rib members 23A and the plurality of rib members 23B are arranged so as to face each other in the thickness direction Z with the concrete 31 to be cut sandwiched therebetween. Note that these do not necessarily have to be formed symmetrically.

[0031] The wall members 22A and 22B, the plurality of rib members 23A and 23B, the reinforcing bar 24, the nuts 25A and 25B, and the plates 26A and 26B of the composite member 21 configured as described above are each made of glass fiber reinforced resin (GFRP: Glass Fiber Reinforced Plastics, resin). Note that at least one of the reinforcing bar 24 and the plates 26A and 26B may be made of glass fiber reinforced resin. Each of the above configurations of the composite member 21 may be made of CFRP (Carbon Fiber Reinforced Plastics), concrete, glass long fiber reinforced plastic foam (FFU), resin (synthetic resin), or the like. At least one of the reinforcing bar 24 and the plates 26A and 26B may be made of resin.

[0032] As shown in FIG. 1, for example, the composite member 21 is arranged such that the thickness direction Z is along the horizontal plane. The plurality of composite members 21 are arranged side by side in the vertical direction. The first direction X in which each rib member 23A extends is preferably a direction along the horizontal plane.

[0033] As shown in FIG. 2, the concrete 31 to be cut is filled between the wall member 22A and the wall member 22B. The concrete to be cut 31 is made of concrete. Note that the filler is not limited to concrete and may be made of mortar or resin. As the resin, urethane, epoxy, etc. are used.

[0034] As shown in Fig. 3, the synthetic segment 20 configured as described above has a rectangular shape corresponding to the through-hole 10a of the wall body 10 when viewed in the thickness direction Z. The synthetic segment 20 is disposed in the through-hole 10a of the wall body 10 and is integrated with the wall body 10. In the central portion of the synthetic segment 20 when viewed in the thickness direction Z, an excavable region 33 is formed. As shown in Fig. 3, for example, the excavable region 33 has a circular shape when viewed in the thickness direction Z.

[0035] As shown in Fig. 3, it is preferable that the arrangement density of the reinforcing bars 24 in the direction along the horizontal plane in the excavable region 33 gradually decreases as the distance from the centroid B of the excavable region 33 of the synthetic segment 20 (caisson 1) in the direction along the horizontal plane increases. Here, the arrangement density of the reinforcing bars 24 in the direction along the horizontal plane means the number of the reinforcing bars 24 arranged per unit length in the direction along the horizontal plane. By configuring in this way, the number of the reinforcing bars 24 can be reduced and the reinforcing bars 24 can be arranged efficiently.

[0036] It is preferable that the reinforcing bars 12 of the wall body 10 extend into the concrete to be cut 31 in the portion other than the excavable region 33 in the synthetic segment 20. By configuring in this way, the joint strength between the wall body 10 and the synthetic segment 20 can be increased.

[0037] Next, a method for constructing a caisson for constructing the caisson 1 configured as described above in the ground G will be described. First, as shown in Fig. 4, on the ground, in a formwork (not shown), the main body concrete 11 is placed on the appropriately arranged reinforcing bars 12 to manufacture the first part 15 made of reinforced concrete. The bottom concrete is not formed in this first part 15. As shown in FIG. 5, place the assembled first part 15 so that the blade part 15a faces downward, press the first part 15 downward into the ground G as shown by the arrow A3, and then discharge the earth and sand in the first part 15 upward as shown by the arrow A4.

[0038] When the first part 15 is pressed into the ground G to a certain extent, as shown in FIG. 6, place the reinforcing bars 12 that make up the second part 16 on the first part 15. As shown in FIG. 7, place a formwork 50 for manufacturing the second part 16 and a formwork 52 for manufacturing the synthetic segment 20 on the first part 15 respectively. Place a plurality of synthetic members 21 in the formwork 52 (first step).

[0039] Pour the main body concrete 11 into the formwork 50 to manufacture the second part 16. Pour the concrete to be cut 31 into the formwork 52 to manufacture the synthetic segment 20. At this time, pour the concrete to be cut 31 on the other side Z2 (the second surface 22bA side with respect to the first surface 22aA) of the wall material 22A to construct the synthetic segment 20 (second step). When the formworks 50 and 52 are removed, the caisson 1 is constructed. By performing the first step and the second step, the construction method of the synthetic segment 20 is carried out. As shown in FIG. 1, after pressing the constructed caisson 1 downward into the ground G as shown by the arrow A6, discharge the earth and sand in the first part 15 upward as shown by the arrow A7.

[0040] At this time, the vertical load is borne by the concrete to be cut 31. Therefore, the wall materials 22A and 22B are not subjected to a load of such a magnitude as to cause crushing as in the conventional case. Therefore, a relatively inexpensive resin composite material can be used for the wall materials 22A and 22B, and an increase in the manufacturing cost of the synthetic members 21 can be suppressed. And since the reinforcing bars 24 are arranged above the first reference plane S1 or on the second surface 22bA side of the reference plane S1, the outer surfaces of the plurality of synthetic members 21 are not caught by the ground G.

[0041] According to the vertical length of the necessary caisson 1, the step of manufacturing the first part 15 on the second part 16 and the composite segment 20 may be performed. When the bottom concrete is placed on the bottom surface of the first part 15, the caisson 1 is constructed.

[0042] Note that the constructed caisson 1 is used by excavating the excavable area 33 with a shield excavator (not shown). Since the outer surfaces of the plurality of composite members 21 are not caught in the ground G, the excavation by the shield excavator can be started immediately.

[0043] As described above, in the composite member 21 of the present embodiment, an excavable area 33 is formed by a plurality of composite members 21 in a part of the caisson 1 buried in the ground G. Therefore, the excavable area 33 can be excavated by a shield excavator or the like. Further, the plurality of reinforcing bars 24 are arranged on the first reference plane S1 in the wall member 22A or on the second surface 22bA side rather than the first reference plane S1. Therefore, by arranging the composite member 21 so that the first reference plane S1 is on the outer side of the composite member 21, it is possible to suppress the plurality of reinforcing bars 24 from protruding to the outside.

[0044] The composite member 21 includes a nut 25A. Therefore, the reinforcing bar 24 can be more reliably attached to the wall member 22A by the nut 25A. The composite member 21 includes a plate 26A. By the plate 26A, the force acting on the nut 25A can be more dispersed and transmitted to the wall member 22A.

[0045] The nut 25A is arranged on the second surface 22bA side of the wall member 22A with respect to the first reference plane S1. Therefore, for example, by arranging the composite member 21 so that the first reference plane S1 is on the outer side of the composite member 21, it is possible to more reliably suppress the nut 25A from protruding to the outside. The composite member 21 includes a plurality of rib members 23A. Therefore, when filling the cut concrete 31 on the second surface 22bA side of the wall member 22A, the contact area of the wall member 22A and the plurality of rib members 23A as a whole with the cut concrete 31 increases compared to the contact area of the wall member 22A alone with the cut concrete 31. Accordingly, the adhesion strength between the wall member 22A and the cut concrete 31 can be enhanced.

[0046] At least one of the reinforcing bars 24 and the plate 26A may be made of resin. In this case, at least one of the reinforcing bars 24 and the plate 26A can be more reliably excavated by a shield tunneling machine or the like. At least one of the reinforcing bars 24 and the plate 26A may be made of glass fiber reinforced resin. In this case, at least one of the reinforcing bars 24 and the plate 26A can be formed to be relatively lightweight and high-strength, and can be more reliably excavated by a shield tunneling machine or the like.

[0047] Also, in the construction method of the composite segment 20 of the present embodiment, the composite segment 20 can be constructed using the composite member 21 in which the protrusion of the reinforcing bar 24 to the outside is suppressed. The cut concrete 31 is formed of concrete. Therefore, the cut concrete 31 can be more reliably excavated by a shield tunneling machine or the like.

[0048] As shown in FIG. 8, the composite member 41 of the first modification may be configured. The composite member 41 includes wall members 42A and 42B instead of the wall members 22A and 22B in each configuration of the composite member 21. In the wall member 42A, a recess 43A is formed in the first surface 42aA with respect to the configuration of the wall member 22A. The recess 43A is formed at the central portion of the first surface 42aA when the wall member 22A is viewed in the thickness direction Z. The recess 43A is recessed in a frustum of a cone shape toward the other side Z2 corresponding to the plate 26A. That is, the diameter of the recess 43A gradually decreases toward the other side Z2. Here, a first reference surface (reference surface) S5 including the outer peripheral edge of the first surface 42aA is defined.

[0049] On the second surface 42bA of the wall member 42A, a convex portion 44A protruding toward the other side Z2 corresponding to the concave portion 43A is formed. A through hole 22cA is formed in the bottom surface of the concave portion 43A. A nut 25A is passed through the through hole 22cA of the wall member 42A, and the nut 25A is fixed to the peripheral edge portion of the through hole 22cA in the wall member 42A by an adhesive or the like. The nut 25A protrudes to the other side Z2 more than the convex portion 44A. In this example, the end surface on one side Z1 of the nut 25A is disposed on the first reference plane S5.

[0050] The male screw formed at the end on one side Z1 of the reinforcing rib 24 is fitted into the female screw of the nut 25A. The end surface on one side Z1 of the reinforcing rib 24 is disposed on the first reference plane S5. The plate 26A is disposed in the concave portion 43A of the wall member 42A. A portion on one side Z1 of the nut 25A is disposed in the through hole of the plate 26A. The nut 25A is fixed to the plate 26A by an adhesive or the like. The outer surface on one side Z1 of the plate 26A is disposed on the first reference plane S5.

[0051] The wall member 42B, the plurality of rib members 23B, the nut 25B, the plate 26B, and the wall member 42A, the plurality of rib members 23A, the nut 25A, and the plate 26A are formed symmetrically with respect to the second reference plane S3. Note that these do not necessarily have to be formed symmetrically. The composite member 41 of the first modification configured as described above can also achieve the same effects as the composite member 21 of the present embodiment.

[0052] (Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. 9 to 13. The same parts as those in the above embodiment are denoted by the same reference numerals and the description thereof is omitted, and only the different points will be described. As shown in FIGS. 9 and 10, in each configuration of the composite member 61 of the present embodiment, instead of the plurality of reinforcing bars 24, nuts 25A and 25B, and plates 26A and 26B in the composite member 21 of the first embodiment, a plurality of reinforcing bars 62 are provided. In FIG. 9, the concrete to be cut 31 is indicated by a two-dot chain line. Note that the number of the rib members 23A provided in the composite member 61 may be one, and the number of the reinforcing bars 62 provided in the composite member 61 may be one.

[0053] In the present embodiment, a plurality of through holes 23aA are formed in the rib member 23A. The plurality of through holes 23aA penetrate the rib member 23A in the second direction Y. In this example, each through hole 23aA has a circular shape when viewed in the second direction Y. The plurality of through holes 23aA are arranged at intervals in the first direction X. Note that the shape of the through hole 23aA when viewed in the second direction Y is not limited to a circular shape. The number of the through holes 23aA formed in the rib member 23A is not limited and may be one.

[0054] The reinforcing bar 62 has a reinforcing body 63 and a pair of first reinforcing pieces (reinforcing pieces) 64. The reinforcing body 63 extends in the thickness direction Z. Each first reinforcing piece 64 extends from an end portion of the reinforcing body 63 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 64 is respectively arranged in the through hole 23aA of the rib member 23A and the through hole 23aB of the rib member 23B. As shown in FIG. 10, the angle θ1 formed by the reinforcing body 63 and the first 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.

[0055] In this way, the reinforcing bar (reinforcing member) 62 is attached to the rib members 23A and 23B. The statement "the reinforcing bars 62 are attached to the rib members 23A and 23B" here means not only that the reinforcing bars 62 are directly attached to the rib members 23A and 23B without any other members in between, but also that the reinforcing bars 62 are attached to the rib members 23A and 23B via other members. For example, the reinforcing main body 63 and the pair of first reinforcing pieces 64 of the reinforcing bar 62 are integrally formed of a glass fiber reinforced resin.

[0056] The caisson using the composite member 61 configured as described above is constructed as follows, for example. In the construction method of the caisson of the first embodiment, in the first step, the formworks 50 and 52 are arranged on the first portion 15. After that, the wall material 22A provided with the rib member 23A and the wall material 22B provided with the rib member 23B are attached to the formwork 52. The pair of first reinforcing pieces 64 of the reinforcing bar 62 are respectively passed through the through holes 23aA of the rib member 23A and the through holes 23aB of the rib member 23B. The cuttable concrete 31 is placed between the wall material 22A and the wall material 22B to construct the composite segment (second step). The following steps are the same as those in the construction method of the caisson of the first embodiment.

[0057] As described above, in the composite member 61 of the present embodiment, an excavable area is formed by a plurality of composite members 61 in a part of the caisson 1 buried in the ground G. Therefore, the excavable area can be excavated by a shield tunneling machine or the like. Further, the reinforcing member 62 can be attached to the rib member 23A provided on the wall material 22A. The plurality of reinforcing bars 62 are arranged on the first reference plane S1 in the wall material 22A or on the side of the second surface 22bA rather than the first reference plane S1. Therefore, by arranging the composite member 61 so that the first reference plane S1 is on the outer side of the composite member 61, it is possible to suppress the plurality of reinforcing bars 62 from protruding to the outside. Compared with the case where the pair of first reinforcing pieces 64 of the reinforcing bar 62 are not arranged in the through holes 23aA and 23aB of the rib members 23A and 23B, the connection strength between the rib members 23A and 23B and the reinforcing bar 62 can be increased.

[0058] It is desirable that the angle θ1 formed between the reinforcing main body 63 and the first reinforcing piece 64 be 70 degrees or more and less than 110 degrees. In this example, for instance, the angle θ1 is 90 degrees. By configuring it like the composite member 61 of the present embodiment, when the rib member 23A is attached to the connection portion between the reinforcing main body 63 and the first reinforcing piece 64, it is possible to make it difficult for the reinforcing rib 62 to come off from the rib member 23A.

[0059] The configuration of the composite member 61 of the present embodiment can be variously modified as described below. The composite member 71 of the first modification example shown in FIG. 11 includes a plurality of reinforcing ribs 72 instead of the plurality of reinforcing ribs 62 in each configuration of the composite member 61. In addition to each configuration of the reinforcing rib 62, the reinforcing rib 72 has a pair of second reinforcing pieces 65. Each second reinforcing piece 65 extends so as to approach each other from one end portion (lower end portion) in the second direction Y of each first reinforcing piece 64. The length of the second reinforcing piece 65 is less than half the length of the reinforcing main body 63. It is preferable that the angle θ2 formed between the first reinforcing piece 64 and the second reinforcing piece 65 be 70 degrees or more and less than 110 degrees. In this example, for instance, the angle θ2 is 90 degrees. By configuring it like the composite member 71 of the first modification example, it is possible to make it difficult for the reinforcing rib 72 to come off from the rib members 23A and 23B.

[0060] The composite member 76 of the second modification example shown in FIG. 12 has a fastener 77 in addition to each configuration of the composite member 61. In the composite member 76 of the second modification example, it is preferable that a male screw (not shown) be formed on the outer peripheral surface of the first reinforcing piece 64. As the fastener 77, a nut or the like formed of a glass fiber reinforced resin can be used. The fastener 77 is disposed on one side (lower side) in the second direction Y from the rib member 23A and is fitted to the male screw of the first reinforcing piece 64. It is preferable that the diameter of the through hole 23aA of the rib member 23A be smaller than the outer diameter of the fastener 77. By configuring it like the composite member 76 of the second modification example, the length of the reinforcing rib 72 can be shortened compared to the composite member 61, and the manufacturing cost of the reinforcing rib 72 can be reduced. It is possible to make it difficult for the reinforcing rib 62 to come off from the rib members 23A and 23B.

[0061] The composite member 81 of the third modification example shown in FIG. 13 includes locking members 82A and 82B in addition to each configuration of the composite member 61. For example, the locking member 82A is formed in a rod shape from a glass fiber reinforced resin. The locking member 82A is arranged so as to extend in the second direction Y. The locking member 82A is passed through the through hole 23aA of the rib member 23A and fixed to the rib member 23A. The locking member 82A is spaced apart from the wall member 22A toward the other side Z2. The locking member 82A protrudes from one side (lower side) and the other side (upper side) of the second direction Y with respect to the rib member 23A, respectively.

[0062] The first reinforcing piece 64 arranged on one side Z1 of the reinforcing rib 62 is arranged on the rib member 23A and is locked to the locking member 82A from one side Z1 of the locking member 82A. Similarly, the first reinforcing piece 64 arranged on the other side Z2 of the reinforcing rib 62 is arranged on the rib member 23B and is locked to the locking member 82B from the other side Z2 of the locking member 82B. The composite member 81 of the third modification example configured as described above can also achieve the same effects as the composite member 61 of the present embodiment.

[0063] As described above, the first embodiment, the second embodiment, and their modification examples 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 modification examples, and also includes configuration changes, combinations, deletions, etc. within the scope not departing from the gist of the present invention. Furthermore, it goes without saying that each configuration shown in each embodiment and their modification examples can be used in appropriate combination. For example, in the first embodiment, the composite member 21 may not include the wall member 22B, the plurality of rib members 23A, 23B, the nuts 25A, 25B, and the plates 26A, 26B. The same applies to the composite member 41 of the first modification example.

[0064] In the embodiment, the embedded structure is assumed to be a caisson, but the embedded structure is not limited thereto, and a shaft wall or the like may be used.

Explanation of Reference Numerals

[0065] 1 Caisson (embedded structure) 20 Composite segment 21, 41, 61, 71, 76, 81 Composite member 22A, 22B, 42A, 42B Wall member 22aA, 42aA First surface 22bA, 42bA Second surface 23A, 23B Rib member 24, 62, 72 Reinforcing bar (reinforcing member) 25A, 25B Nut (fastening tool) 26A, 26B Plate (connecting member) 31 Cut concrete (filling material) 33 Excavable area 33a Periphery 63 Reinforcement body 64 First reinforcing piece (reinforcing piece) B Centroid G Subsurface S1, S5 First reference plane (reference plane) Z Thickness direction

Claims

1. A composite member for forming an excavable area in a portion of a buried structure buried in the ground, comprising: A resin wall material that forms the excavable area; A reinforcing member attached to the wall material; Equipped with A composite member, wherein the reinforcing member is positioned on a reference plane including the outer peripheral edge of a first surface of the wall material facing the thickness direction of the wall material, or on the side of a second surface of the wall material facing the thickness direction of the wall material, closer to the reference plane.

2. 10. The composite member of claim 1, further comprising a fastener covering a portion of the reinforcing member and attached to the reinforcing member.

3. 3. The composite member of claim 2, further comprising a connecting member disposed between the wall material and the fastener, the connecting member having an outer diameter greater than an outer diameter of the fastener.

4. The composite member according to claim 2 or 3, wherein the fastener is arranged on the second surface side of the wall material that faces the reference surface.

5. 3. The composite member of claim 1 or 2, further comprising a ridge member provided on the second surface of the wall member.

6. 4. The composite member of claim 3, wherein at least one of the reinforcing member and the connecting member is made of resin.

7. 4. The composite member of claim 3, wherein at least one of the reinforcing members and the connecting members is made of fiberglass reinforced resin.

8. The composite member according to claim 1 or 2, wherein the arrangement density of the reinforcing members in the excavable area in a direction along a horizontal plane gradually decreases as the distance from the centroid of the excavable area in a direction along the horizontal plane increases.

9. A composite member for forming an excavable area in a portion of a buried structure buried in the ground, comprising: A resin wall material that forms the excavable area; A protruding strip member is provided on a second surface of the wall material opposite to a first surface facing a thickness direction of the wall material; A reinforcing member attached to the protruding member; Equipped with A composite member, wherein the reinforcing member is disposed on a reference plane including an outer peripheral edge of the first surface of the wall material, or on the second surface side of the reference plane.

10. The reinforcing member is A reinforcing body extending in the thickness direction; A reinforcing piece extending in a predetermined direction from an end of the reinforcing body; having 10. The composite member of claim 9, wherein the angle between the reinforcing body and the reinforcing piece is greater than or equal to 70 degrees and less than 110 degrees.

11. A first step of placing a composite member according to claim 1 or 2; A second step of constructing a composite segment by pouring a filler material on the second surface side of the wall material opposite to the first surface; A construction method for composite segments.

Images