cement structure

Abstract

This improves the workability when installing the reinforcing bars 30. [Solution] A cement structure 100 comprising a first grid-like reinforcement 10, a second grid-like reinforcement 20, one or more reinforcing bars 30, and a concrete section 40, wherein the reinforcing bar 30 includes a reinforcing bar 31a that extends in a third direction and a protruding bar 312a that protrudes from the extended bar 311a in a second direction, a reinforcing bar 31c that extends in a third direction and a protruding bar 312c that protrudes from the extended bar 311c in a second direction, and a connecting section 32 that connects the extended bar 311a and the extended bar 311c on the opposite side of the protruding bar 312a and the protruding bar 312c via at least one of the first grid-like reinforcement 10 and the second grid-like reinforcement 20 in the third direction.

Description

Technical Field

[0001] The present invention relates to a cement structure.

Background Art

[0002] As disclosed in Patent Documents 1 to 3, concrete structures including lattice-shaped reinforcing bars are known. In cement structures such as concrete structures, those formed by arranging two or more lattice-shaped bars in a formwork and filling the formwork with cement paste or the like are known. Further, in cement structures, a configuration for improving strength by additionally providing reinforcing bars in addition to lattice-shaped bars is known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] Here, when providing a large number of reinforcing bars to further improve strength, it takes time and effort to attach them.

[0005] The present invention has been made in view of such circumstances, and an object thereof is to provide a cement structure that improves workability when attaching reinforcing bars.

Means for Solving the Problems

[0006] The invention disclosed in the present application for solving the above problems has various aspects, and an outline of typical ones of those aspects is as follows.

[0007] (1) A first grid-like reinforcement comprising a plurality of first main reinforcements extending in a first direction and a plurality of first distribution reinforcements extending in a second direction intersecting the first direction; a second grid-like reinforcement comprising a plurality of second main reinforcements extending in the first direction and a plurality of second distribution reinforcements extending in a second direction, and positioned opposite to the first grid-like reinforcement in a third direction intersecting the first and second directions; one or more reinforcing bars provided to improve strength in the third direction; and a cement portion in which the first grid-like reinforcement, the second grid-like reinforcement, and the reinforcing bars are embedded. A cement structure comprising: a first reinforcing portion including a first extension portion extending in the third direction and a first projection portion projecting from the first extension portion in the second direction; a second reinforcing portion including a second extension portion extending in the third direction and a second projection portion projecting from the second extension portion in the second direction; and a connecting portion connecting the first extension portion and the second extension portion on the opposite side of the first projection portion and the second projection portion via at least one of the first grid-like reinforcement and the second grid-like reinforcement in the third direction.

[0008] (2)(1) A cement structure in which the first projection is in contact with the second main reinforcement in the third direction.

[0009] (3) A cement structure in which, in (1) or (2), the connecting portion is in contact with the first main reinforcement in the third direction.

[0010] (4) A cement structure in any of (1) to (3) wherein the first extension portion is in contact with the first main reinforcement and the second main reinforcement in the second direction.

[0011] (5) In any of (1) to (4), the reinforcing bar includes a first spacer portion that protrudes outward from the second grid-like bar in the third direction, a cement structure.

[0012] (6) In any of (1) to (5), the reinforcing bar includes a second spacer portion that protrudes outward from the first grid-like bar in the third direction, and the cement structure.

[0013] (7) In any of (1) to (6), the reinforcing bar is provided adjacent to the portion where the first main bar and the first distribution bar intersect in the first direction, a cement structure.

[0014] (8) In any of (1) to (7), the reinforcing bar is a reinforcing bar made of a fibrous material contained in a resin material, a cement structure.

[0015] (9) A cement structure in which, in any of (1) to (8), the first main reinforcement and the second main reinforcement are curved in shape.

[0016] (10)(1) to (9), wherein the plurality of first main reinforcements and the plurality of first distribution reinforcements each consist of rod-shaped reinforcement materials, and the first grid-like reinforcement is constructed by arranging the plurality of first main reinforcements and the plurality of first distribution reinforcements so that they intersect and overlap each other in a plan view, a cement structure.

[0017] In (11)(1), the first projection is in contact with the second main reinforcement in the third direction, the connecting portion is in contact with the first main reinforcement in the third direction, the first extension portion is in contact with the first main reinforcement and the second main reinforcement in the second direction, the first main reinforcement and the second main reinforcement are curved in shape, the reinforcing bar includes a first spacer portion that protrudes outward from the second grid reinforcement in the third direction, and a second spacer portion that protrudes outward from the first grid reinforcement in the third direction, and is provided adjacent to the portion where the first main reinforcement and the first distribution reinforcement intersect in the first direction, and is a reinforcement material made of a fibrous material contained in a resin material, a cement structure. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide a cement structure that improves workability when attaching reinforcing bars.

Brief Description of the Drawings

[0019] [Figure 1] It is a perspective view showing a cement structure. [Figure 2] It is a cross-sectional view of the cement structure cut along a cutting line along the longitudinal direction. [Figure 3] It is a plan view for explaining the configuration of the reinforcing bars of the present embodiment. [Figure 4] It is a perspective view showing the reinforcing bars of the present embodiment. [Figure 5] It is a perspective view showing the cement structure of the first modification. [Figure 6] It is a cross-sectional view of the cement structure of the first modification cut along a cutting line perpendicular to the axial direction. [Figure 7] It is a plan view for explaining the configuration of the reinforcing bars of the first modification. [Figure 8] It is a perspective view showing the reinforcing bars of the first modification. [Figure 9] It is a plan view for explaining the configuration of the reinforcing bars of the second modification. [Figure 10] It is a perspective view showing lattice-shaped bars of another example. [Figure 11] It is a view showing the arrangement of lattice-shaped bars of another example.

Mode for Carrying Out the Invention

[0020] Hereinafter, embodiments according to the present invention (hereinafter referred to as the present embodiment) will be described with reference to the drawings.

[0021] [Outline of Cement Structure] The outline of the cement structure 100 according to this embodiment will be described with reference to Figures 1 and 2. Figure 1 is a perspective view showing the cement structure. Figure 2 is a cross-sectional view of the cement structure cut along a cutting line in the longitudinal direction. In this embodiment, an example is described in which the cement structure 100 has a concrete portion 40 made of concrete, but it is not limited to this, and may have a cement portion made of cement material such as mortar.

[0022] The cement structure 100 includes a first grid-like reinforcement 10, a second grid-like reinforcement 20, one or more reinforcing bars 30, and a concrete section 40. As shown in Figure 2, the concrete section 40 has the first grid-like reinforcement 10, the second grid-like reinforcement 20, and the multiple reinforcing bars 30 embedded in it, and constitutes the outer shape of the cement structure 100. Note that the concrete section 40 is not shown in Figure 1.

[0023] The first grid-like reinforcement 10 includes a plurality of first main reinforcement bars 11 extending in the longitudinal direction of the cement structure 100 (hereinafter simply referred to as the longitudinal direction), which is the first direction, and a plurality of first distribution reinforcement bars 12 extending in the short direction of the cement structure 100 (hereinafter simply referred to as the short direction), which is the second direction intersecting the longitudinal direction. The plurality of first main reinforcement bars 11 and the plurality of first distribution reinforcement bars 12 intersect each other to form a grid.

[0024] The second grid-like reinforcement 20 includes a plurality of second main reinforcement bars 21 extending in the longitudinal direction and a plurality of second distribution reinforcement bars 22 extending in the transverse direction. The plurality of second main reinforcement bars 21 and the plurality of second distribution reinforcement bars 22 intersect each other to form a grid. The second grid-like reinforcement 20 is arranged opposite the first grid-like reinforcement 10 in the thickness direction of the cement structure 100 (hereinafter simply referred to as the thickness direction), which is a third direction intersecting the longitudinal and transverse directions.

[0025] The reinforcing bars 30 are provided to improve the strength of the cement structure 100 in the thickness direction. The thickness direction is the shear direction of the cement structure 100, which is perpendicular to the longitudinal and transverse directions of the cement structure 100. The details of the configuration and arrangement of the reinforcing bars 30 will be described below with reference to Figures 1 to 4.

[0026] [Reinforcement muscles] Figure 3 is a plan view illustrating the configuration of the reinforcing bars in this embodiment. Figure 4 is a perspective view showing the reinforcing bars in this embodiment.

[0027] As shown in Figures 3 and 4, the reinforcing bar 30 includes a plurality of reinforcing sections 31a to 31c and a connecting section 32 that connects the plurality of reinforcing sections 31a to 31c. The ends of the plurality of reinforcing sections 31a to 31c are each connected to the connecting section 32. The connecting section 32 may be a reinforcing bar that extends in the short direction. In the following description, the subscripts a to c will be omitted when it is not necessary to distinguish between the plurality of reinforcing sections 31a to 31c and their respective parts.

[0028] The reinforcing bar 30 includes extended portions 311a to 311c extending in the thickness direction from the connecting portion 32, protruding portions 312a to 312c projecting in the short direction at the ends of each of the extended portions 311a to 311c, protruding portions 313a to 313c projecting in the opposite direction to the protruding portions 312a to 312c, and spacer portions 314a to 314c (first spacer portion) projecting downward in Figure 3. The spacer portions 314a to 314c are preferably projected outward in the thickness direction from the second lattice-shaped reinforcement bar 20.

[0029] Furthermore, the reinforcing bar 30 has spacer portions 315a to 315c (second spacer portions) that protrude to the upper side in Figure 3 (opposite the direction of protrusion of spacer portions 314a to 314c in the thickness direction). The spacer portions 315a to 315c should protrude outward in the thickness direction more than the first lattice-shaped reinforcement bar 10. The spacer portion 314, the spacer portion 315, and the extension portion 311 should be located on the same straight line in the thickness direction.

[0030] As shown in Figure 3, the protruding portion 312 is positioned outside the second main reinforcement 21 in the thickness direction and preferably in contact with the second main reinforcement 21 in the thickness direction. The amount of protrusion of the protruding portion 312 should be greater than or equal to the width of the second main reinforcement 21 in the short direction. Furthermore, the extended portion 311 should preferably be in contact with the second main reinforcement 21 in the short direction. The contact state of the protruding portion 312 and the extended portion 311 with respect to the second main reinforcement 21 should preferably be maintained by the concrete portion 40, which is made up of concrete that has been filled and hardened around them.

[0031] As shown in Figure 3, the connecting portion 32 is positioned above the first main reinforcement 11 and preferably in contact with the first main reinforcement 11 in the thickness direction. Furthermore, the extension portion 311 preferably in contact with the first main reinforcement 11 in the short direction. The contact state of the connecting portion 32 and the extension portion 311 with respect to the first main reinforcement 11 is preferably maintained by the concrete portion 40, which consists of concrete that has been filled and hardened around them. Note that the connecting portion 32 is not limited to the arrangement shown in Figure 3, and may be provided to connect the extension portions 311a to 311c on the opposite side of the protruding portions 312a to 312c via at least one of the first grid-like reinforcement 10 and the second grid-like reinforcement 20 in the thickness direction.

[0032] The connecting portion 32 may have a length corresponding to the external dimensions of the cement structure 100, as shown in Figure 3. Specifically, the connecting portion 32 may have the same length as the width in the shorter direction of the cement structure 100. However, it is not strictly limited to the same length; the connecting portion 32 should be long enough so that it is not necessary to provide multiple reinforcing bars 30 in the shorter direction. Furthermore, the length of the connecting portion 32 should be at least longer than the extension portion 311, and preferably at least twice the length of the extension portion 311. By increasing the length of the connecting portion 32, it becomes possible to provide more reinforcing portions 31. However, it is not limited to this, and the length of the connecting portion 32 may be shorter than the extension portion 311.

[0033] In this embodiment, the reinforcing portion 31 and the connecting portion 32 are shown in contact with the first main reinforcement 11 and the second main reinforcement 21, but the embodiment is not limited to this, and they may be arranged in close proximity and not in contact with each other. Here, proximity means that the distance between the surfaces of the two is 10 mm or less, and preferably 5 mm or less. It is preferable that at least one of the reinforcing portion 31 and the connecting portion 32 is in contact with the grid reinforcement 10, and it is more preferable that both are in contact with the grid reinforcement 10.

[0034] [summary] As described above, the reinforcing bars 30 are provided so as to sandwich the first grid-like bars 10 and the second grid-like bars 20 in the thickness direction by the protruding portion 312 and the connecting portion 32. By adopting this configuration, the reinforcing bars 30 contribute to improving the strength of the first grid-like bars 10 and the second grid-like bars 20 in the thickness direction. As a result, the strength of the cement structure 100 in the thickness direction is improved. Therefore, cracking of the concrete portion 40 can be suppressed.

[0035] Furthermore, since multiple reinforcing parts 31 are connected by connecting parts 32, the manufacturing process of the cement structure 100 is made easier compared to a configuration in which multiple separate reinforcing parts are sequentially assembled to the grid-like reinforcement. Also, since multiple reinforcing parts 31 are connected and integrated by connecting parts 32, the number of parts can be reduced. In addition, by increasing the number of reinforcing parts 31, the strength of the cement structure 100 can be easily improved without complicating the manufacturing process of the cement structure 100. Moreover, by adopting a configuration in which multiple thin reinforcing parts 31 are arranged to correspond to the grid-like reinforcement, the uniformity of strength in the cement structure 100 is improved compared to a configuration in which thick reinforcement is sparsely arranged. As a result, cracking of the concrete part 40 can be suppressed. Furthermore, by making the thin reinforcing parts 31 out of fibrous material, cutting becomes easier compared to a configuration using thick reinforcement.

[0036] Furthermore, since protrusions 312 and 313 are provided at the tip of each reinforcing part 31, the anchorage of each reinforcing part 31 to the concrete part 40 is improved, and the reinforcing bars 30 are firmly fixed to the concrete part 40. As a result, cracking of the concrete part 40 can be suppressed.

[0037] Furthermore, the presence of spacer portions 314 and 315 in the reinforcing bar 30 improves workability in the manufacturing process of the cement structure 100. In the manufacturing process of the cement structure 100, the first grid-like reinforcement bars 10 and the second grid-like reinforcement bars 20 are placed in a formwork, and cement paste is filled into the formwork. At this time, accuracy in the spacing between the first grid-like reinforcement bars 10 and the second grid-like reinforcement bars 20 in the thickness direction is required. In addition, it is necessary to provide gaps between the first grid-like reinforcement bars 10 and the formwork, and between the second grid-like reinforcement bars 20 and the formwork, for filling with cement paste. In the configuration of this embodiment, spacer portion 314 functions as a spacer that provides a gap between the second grid-like reinforcement bars 20 and the formwork, and spacer portion 315 functions as a spacer that provides a gap between the first grid-like reinforcement bars 10 and the formwork. Therefore, it is possible to fill the formwork with cement paste while ensuring accuracy in the spacing between the first grid-like reinforcement bars 10 and the second grid-like reinforcement bars 20 without providing separate spacers. In other words, the process of separately providing spacers can be omitted, improving work efficiency. Furthermore, the protruding parts 313a and 312c that constitute both ends in the short direction will function as spacers in the short direction. Similarly, the protruding parts 321 and 322 of the connecting part 32 that protrude in the short direction will also function as spacers in the short direction.

[0038] [Differentiation] Figure 5 is a perspective view showing the cement structure of the first modified example. Figure 6 is a cross-sectional view of the cement structure of the first modified example, cut by a cutting line perpendicular to the axial direction. Figure 7 is a plan view illustrating the configuration of the reinforcing bars of the first modified example. Figure 8 is a perspective view showing the reinforcing bars of the first modified example. The concrete portion is omitted in Figure 5. The cement structure 200 of the first modified example is arc-shaped, unlike the rectangular cement structure 100 shown in the above embodiment. Therefore, the first main reinforcement bars 111 of the first grid reinforcement bars 110 and the second main reinforcement bars 121 of the second grid reinforcement bars 120 are arc-shaped. In the first modified example, a segment, which is a block member constituting the wall surface of a tunnel formed by the shield tunneling method, will be described as an example of the cement structure 200.

[0039] The cement structure 200 includes a first grid-like reinforcement 110, a second grid-like reinforcement 120, one or more reinforcing bars 130, and a concrete section 140. As shown in Figure 6, the concrete section 140 has the first grid-like reinforcement 110, the second grid-like reinforcement 120, and the multiple reinforcing bars 130 embedded in it, and constitutes the outer shape of the cement structure 200. Note that the concrete section 40 is not shown in Figure 5.

[0040] The first grid-like reinforcement 110 includes a plurality of first main reinforcement bars 111 extending in the first direction, which is the circumferential direction of the segment (hereinafter simply referred to as the circumferential direction), and a plurality of first distribution reinforcement bars 112 extending in the second direction, which is the axial direction of the segment (hereinafter simply referred to as the axial direction), intersecting the circumferential direction. The plurality of first main reinforcement bars 111 and the plurality of first distribution reinforcement bars 112 intersect each other to form a grid. The first main reinforcement bars 111 have a curved shape because they extend in the circumferential direction.

[0041] The second grid-like reinforcement 120 includes a plurality of second main reinforcement bars 121 extending in the circumferential direction and a plurality of second distribution reinforcement bars 122 extending in the axial direction. The plurality of second main reinforcement bars 121 and the plurality of second distribution reinforcement bars 122 intersect each other to form a grid. The second main reinforcement bars 121 have a curved shape because they extend in the circumferential direction. The second grid-like reinforcement 120 is arranged to face the first grid-like reinforcement 110 in the radial direction of the segment (hereinafter simply referred to as the radial direction), which is a third direction intersecting the circumferential and axial directions.

[0042] The reinforcing bars 130 are provided to improve the strength of the cement structure 100 in the radial direction. As shown in Figures 7 and 8, the reinforcing bars 130 include a plurality of reinforcing sections 131a to 131j and a connecting section 132 that connects the plurality of reinforcing sections 131a to 131j. The ends of the plurality of reinforcing sections 131a to 131j are each connected to the connecting section 132. The connecting section 132 may be a reinforcing material that extends in the axial direction. In the following description, the subscripts a to j will be omitted when it is not necessary to distinguish between the plurality of reinforcing sections 131a to 131j and their respective parts.

[0043] The reinforcing bar 130 includes extended portions 1311a to 1311j extending radially from the connecting portion 132, protruding portions 1312a to 1312j projecting axially at the ends of each of the extended portions 1311a to 1311j, protruding portions 1313a to 1313j projecting in the opposite direction to the protruding portions 1312a to 1312j, and spacer portions 1314a to 1314j projecting toward the inner diameter. The spacer portions 1314a to 1314j are preferably projecting toward the inner diameter than the second lattice-shaped reinforcement bar 120.

[0044] Furthermore, the reinforcing bar 130 has spacer portions 1315a to 1315j that protrude outward. The spacer portions 1315a to 1315j should protrude outward more than the first grid-like reinforcement bar 110. The spacer portion 1314, the spacer portion 1315, and the extended portion 1311 should be located on the same straight line in the axial direction.

[0045] As shown in Figure 7, the protruding portion 1312 is positioned on the inner diameter side of the second main reinforcement 121 and preferably in contact with the second main reinforcement 121 in the radial direction. The amount of protrusion of the protruding portion 1312 is preferably greater than or equal to the width of the second main reinforcement 121 in the axial direction. Furthermore, it is preferable that the length of the protruding portion 1312 protrudes axially from the center position of the second main reinforcement 121 in the axial direction. In addition, it is preferable that the extended portion 1311 is in contact with the second main reinforcement 121 in the axial direction. The contact state of the protruding portion 1312 and the extended portion 1311 with respect to the second main reinforcement 121 is preferably maintained by the concrete portion 140, which is made of concrete that has been filled and hardened around them.

[0046] As shown in Figure 7, the connecting portion 132 is positioned on the outer diameter side of the first main reinforcement 111 and preferably in contact with the first main reinforcement 111 in the radial direction. Furthermore, the extension portion 1311 preferably in contact with the first main reinforcement 111 in the axial direction. The contact state of the connecting portion 132 and the extension portion 1311 with respect to the first main reinforcement 111 is preferably maintained by the concrete portion 140, which consists of concrete that has been filled and hardened around them. Note that the connecting portion 132 is not limited to the arrangement shown in Figure 7, and may be provided to connect the extension portions 1311a to 1311j on the opposite side of the protruding portions 1312a to 1312j via at least one of the first grid-like reinforcement 110 and the second grid-like reinforcement 120 in the radial direction.

[0047] Figure 9 is a plan view illustrating the configuration of the reinforcing bars in the second modified example. In Figure 9, only one of the multiple reinforcing parts 531 of the reinforcing bar 530 is labeled with a reference numeral, while the reference numerals for the other reinforcing parts are omitted. Furthermore, for parts of the reinforcing bar 530 that have the same function as the reinforcing bar 130 shown in Figure 7, the same reference numeral is used, and a detailed explanation is omitted. In addition, the first grid-like reinforcement 110, the second grid-like reinforcement 120, and the concrete part 140 are the same as those shown in Figure 7, etc.

[0048] In the second modified example of the reinforcing bar 530, multiple reinforcing sections 531 are connected by two connecting sections 532 and 533. Note that three or more connecting sections may be provided. The connecting section 533 is provided between the connecting section 532 and the protruding section 1312 in the thickness direction (radial direction). Furthermore, the reinforcing bar 530 has protruding sections 5312 and 5313 in addition to the protruding sections 1312 and 1313 shown in Figure 7. The protruding sections 5312 and 5313 protrude from the extended portion of the reinforcing section 531 in the short direction (axial direction) and are located outside the thickness direction of the connecting section 532.

[0049] The protruding portion 5312 is preferably in contact with the first main reinforcement bar 111 in the radial direction. The amount of protrusion of the protruding portion 5312 is preferably greater than or equal to the width of the first main reinforcement bar 111 in the axial direction.

[0050] The reinforcing bars 530 are provided so as to sandwich the first grid-like bars 110 and the second grid-like bars 120 in the radial direction by the protruding portions 1312 and 5312. By adopting this configuration, similar to the cement structure 200 shown in Figure 7, the reinforcing bars 530 contribute to improving the radial strength of the first grid-like bars 110 and the second grid-like bars 120. As a result, the radial strength of the cement structure is improved. Therefore, cracking of the concrete section 140 can be suppressed.

[0051] Furthermore, in the reinforcing bar 530, the first main reinforcement bar 111 is sandwiched between the connecting portion 532 and the protruding portion 5312, and the second main reinforcement bar 121 is sandwiched between the connecting portion 533 and the protruding portion 1312, thereby improving the strength compared to the reinforcing bar 30 shown in Figure 3, etc. Also, since the posture of the multiple reinforcing portions 531 is stabilized, it becomes possible to create a shape that is easier to assemble. In addition, since the posture of the multiple reinforcing portions 531 is stabilized, it becomes possible to create a thinner shape that is easier to cut.

[0052] When using reinforcing bars 530, in the manufacturing process, it is preferable to first place the second grid-like bars 120 in the formwork, then assemble the reinforcing bars 530 to the second grid-like bars 120, and then place the first grid-like bars 110 and assemble them to the reinforcing bars 530. In the cement structure 200 shown in Figure 7 above, etc., in the manufacturing process, it is preferable to place the first grid-like bars 110 and the second grid-like bars 120 in the formwork, then place the reinforcing bars 130, and assemble the reinforcing bars 130 to the first grid-like bars 110 and the second grid-like bars 120.

[0053] Furthermore, the reinforcing bars 530 in the second modified example are not limited to the first grid-like bars 110 and the second grid-like bars 120 shown in Figure 5, etc., but may also be assembled to the first grid-like bars 10 and the second grid-like bars 20 shown in Figure 1, etc.

[0054] [others] Figure 1 and other figures show an example in which there are five first main reinforcements 11 and five second main reinforcements 21, and seven first distribution reinforcements 12 and seven second distribution reinforcements 22. However, it is not limited to this example, and it is preferable to have at least two of each.

[0055] The reinforcing bar 30 may include at least the reinforcing bar 31a and reinforcing bar 31c shown in Figure 3, among the multiple reinforcing bars 31. The number of reinforcing bars 31 may be at least two, but it is preferable that the number corresponds to the number of first main bars 11 and second main bars 21. Furthermore, the spacing of the multiple reinforcing bars 31 in the short direction may correspond to the spacing of the first main bars 11 and the second main bars 21 in the short direction.

[0056] Furthermore, although Figure 1 and other figures show an example where the connecting portion 32 is a reinforcing bar extending in the short direction, the connection portion 32 is not limited to this, and may be a reinforcing bar extending in the longitudinal direction. In this case, the protruding portion 312 should protrude in the longitudinal direction and be provided in contact with the second load distribution reinforcement 22 in the thickness direction.

[0057] Furthermore, while Figure 1 and other figures show an example where the reinforcing bars 30 are inserted from the side of the first grid-like bars 10, the arrangement is not limited to this. The reinforcing bars 30 may also be inserted from the side of the second grid-like bars 20, or they may be arranged so that they are inserted alternately from the first grid-like bar side and the second grid-like bar side.

[0058] Furthermore, although an example in Figure 3 etc. shows that the protruding portion 312 is provided in contact with the second main reinforcement 21, the protruding portion 313 may also be provided in contact with the second main reinforcement 21.

[0059] Furthermore, the protrusions 312 and 313 do not necessarily have to be in contact with the second main reinforcement 21. Even in that case, the protrusions 312 and 313 have the function of catching on the concrete portion 40 in the thickness direction, thereby contributing to an improvement in the strength of the cement structure 100 in the thickness direction.

[0060] Furthermore, the connecting portion 32 does not have to be in contact with the first main reinforcement 11. Even in this case, the connecting portion 32 has the function of connecting multiple reinforcing portions 31, thereby contributing to improved workability in the manufacturing process of the cement structure 100. In addition, since the multiple reinforcing portions 31 are connected to each other by the connecting portion 32, the strength is improved compared to a configuration in which multiple reinforcing portions are provided separately.

[0061] Furthermore, the reinforcing bars 30 are preferably provided adjacent to the portion where the first main reinforcement bars 11 and the first distribution reinforcement bars 12 intersect in the longitudinal direction. However, the reinforcing bars 30 may be provided spaced apart from the portion where the first main reinforcement bars 11 and the first distribution reinforcement bars 12 intersect in the longitudinal direction. Figure 1 shows seven reinforcing bars 30, and an example is shown in which one of the reinforcing bars 30 is adjacent to the portion where the first main reinforcement bars 11 and the first distribution reinforcement bars 12 intersect in the longitudinal direction, and the other six reinforcing bars 30 are provided spaced apart from the portion where the first main reinforcement bars 11 and the first distribution reinforcement bars 12 intersect in the longitudinal direction.

[0062] The cement structure 100 should be suitable for construction purposes such as beam members in elevated bridges, branching tunnels, or connecting multiple tunnels. In particular, in the latter case, each part of the cement structure 100 should be designed to be cut by a shield tunneling machine. For example, the first grid-like reinforcement 10, the second grid-like reinforcement 20, and the reinforcing reinforcement 30 should be reinforcement materials made by incorporating fibrous materials such as carbon fiber, glass fiber, aramid fiber, vinylon fiber, and basalt fiber into a resin material. At least one of these fibrous materials should be selected and used, with carbon fiber, glass fiber, or basalt fiber being more preferred. Specifically, for example, the reinforcing reinforcement 30 should be made of CFRP (Carbon Fiber Reinforced Plastics). However, it is not limited to this, and each of these reinforcement materials may be made of fibrous materials not contained in the resin material. Furthermore, each of these reinforcement materials may be made of metal or the like. Furthermore, each reinforcing bar may be made of the same material or of different materials.

[0063] The reinforcing bars 30 may be produced, for example, by partially cutting a lattice-like structure in which multiple extended portions extending in the thickness direction and multiple extended portions extending in the short direction intersect each other. Alternatively, the reinforcing bars 30 may be produced by tying together rod-shaped reinforcing materials.

[0064] Figure 10 is a perspective view showing another example of grid reinforcement. Figure 11 is a diagram showing the arrangement of grid reinforcement in another example. Grid reinforcement may be composed of multiple rod-shaped reinforcement members that are separate from each other. Specifically, as shown in Figures 10 and 11, grid reinforcement 210 may consist of rod-shaped main reinforcement 211 extending in the longitudinal direction and rod-shaped distribution reinforcement 212 extending in the transverse direction, arranged so as to intersect and overlap each other in a plan view. Plan view means viewing the grid reinforcement 210 from the thickness direction. Also, as in Figure 1, it is preferable that two grid reinforcement (first grid reinforcement, second grid reinforcement) 210 are arranged facing each other in the thickness direction. In this example, the protrusion 312 may be arranged in contact with the main reinforcement 211 in the thickness direction, or it may be arranged in close proximity without contact. Furthermore, the protruding portion 312 may be positioned in contact with the force distribution reinforcement 212 in the longitudinal direction, or it may be positioned in close proximity without contact.

[0065] Furthermore, the cross-sectional shape of the rod-shaped reinforcing bars constituting the grid pattern is preferably circular. However, it is not limited to this, and the cross-sectional shape of the rod-shaped reinforcing bars may also be rectangular or elliptical. In addition, the rod-shaped reinforcing bars are preferably so-called CFRP (Carbon Fiber Reinforced Plastics) rods. As the material for the rod-shaped reinforcing bars that are CFRP rods, at least one of the following should be selected and used: carbon fiber, glass fiber, aramid fiber, vinylon fiber, or basalt fiber. Using CFRP rods improves resistance to corrosion. However, the rod-shaped reinforcing bars may also be steel bars. [Explanation of Symbols]

[0066] 10,110 First grid reinforcement, 11,111 First main reinforcement, 12,112 First distribution reinforcement, 20,120 Second grid reinforcement, 21,121 Second main reinforcement, 22,122 Second distribution reinforcement, 30,130,530 Reinforcement, 31,131 Reinforcement section, 312,1312 Protruding section, 313,1313 Protruding section, 314,315,1314,1315 Spacer section, 32,132 Connecting section, 40,140 Concrete section, 100,200 Cement structure.

Claims

1. A first grid-like reinforcement comprising a plurality of first main reinforcements extending in a first direction and a plurality of first distribution reinforcements extending in a second direction intersecting the first direction, It includes a plurality of second main reinforcements extending in the first direction and a plurality of second distribution reinforcements extending in the second direction, and a second grid reinforcement arranged opposite to the first grid reinforcement in a third direction intersecting the first and second directions, One or more reinforcing bars provided to improve strength in the third direction, The cement portion in which the first grid-like reinforcement, the second grid-like reinforcement, and the reinforcing reinforcement are embedded, A cement structure including, The aforementioned reinforcing bars are A first reinforcing portion including a first extended portion extending in the third direction and a first protruding portion projecting from the first extended portion in the second direction, A second reinforcing portion including a second extended portion extending in the third direction and a second protruding portion projecting from the second extended portion in the second direction, In the third direction, a connecting portion connects the first extension and the second extension via at least one of the first grid-like reinforcement and the second grid-like reinforcement, on the opposite side of the first projection and the second projection, A cement structure including a cement structure.

2. The first projection is in contact with the second main reinforcement in the third direction. The cement structure according to claim 1.

3. The connecting portion is in contact with the first main reinforcement in the third direction. The cement structure according to claim 1.

4. The first extension portion is in contact with the first main reinforcement and the second main reinforcement in the second direction. The cement structure according to claim 1.

5. The reinforcing bar includes a first spacer portion that protrudes outward from the second grid-like bar in the third direction. The cement structure according to claim 1.

6. The reinforcing bar includes a second spacer portion that protrudes outward from the first grid-like bar in the third direction, The cement structure according to claim 1.

7. The reinforcing bars are provided adjacent to the portion where the first main bars and the first distribution bars intersect in the first direction. The cement structure according to claim 1.

8. The aforementioned reinforcing bar is a reinforcing material in which a fibrous material is contained in a resin material. The cement structure according to claim 1.

9. The first main reinforcement and the second main reinforcement are curved in shape. The cement structure according to claim 1.

10. Each of the aforementioned plurality of first main reinforcements and the plurality of first distribution reinforcements consists of a rod-shaped reinforcing material. The first grid-like reinforcement is constructed such that the plurality of first main reinforcement bars and the plurality of first distribution reinforcement bars intersect and overlap each other in a plan view. The cement structure according to claim 1.

11. The first projection is in contact with the second main reinforcement in the third direction, The connecting portion is in contact with the first main reinforcement in the third direction. The first extension portion is in contact with the first main reinforcement and the second main reinforcement in the second direction. The first main reinforcement and the second main reinforcement are curved in shape. The aforementioned reinforcing bars are It includes a first spacer portion that protrudes outward from the second grid-like reinforcement in the third direction, and a second spacer portion that protrudes outward from the first grid-like reinforcement in the third direction, It is provided adjacent to the portion where the first main reinforcement and the first distribution reinforcement intersect in the first direction, It is a reinforcing material in which fibrous material is incorporated into a resin material. The cement structure according to claim 1.

Images