Reinforcement members and concrete structure

Abstract

To suppress a plurality of bound main reinforcement members from taking places during transportation from a plant to a site, the main reinforcement members having been bound by binding members at the plant.SOLUTION: A reinforcement member group comprises: a plurality of main reinforcement members spaced apart in parallel; and flexible fiber bundles arranged to extend in a direction intersecting the main reinforcement members, fixed at parts intersecting the main reinforcement members, and impregnated with reins spaced apart.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a group of reinforcing members and a concrete structure. [Background technology]

[0002] Patent Document 1 describes a fiber-reinforced resin composite tension member that is formed by providing a portion of a fiber-reinforced resin composite reinforced with continuous long fibers that is not impregnated with resin, bending the portion that is not impregnated with resin to form at least two or more fiber-reinforced resin composites, and then impregnating and curing the bent portions with resin to integrally fix them together, thereby forming a fiber-reinforced resin composite tension member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 1-290858 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, a reinforced concrete column, which is an example of a concrete structure, is configured to include a concrete portion and a reinforcing bar cage arranged inside the concrete portion. The reinforcing bar cage includes a plurality of main bars extending in the vertical direction and arranged in a cylindrical shape with a space therebetween in a plan view, and a circular hoop bar that restrains the plurality of main bars. In this way, the hoop bar functions as a restraining member that restrains the plurality of reinforcing bars.

[0005] Here, the hoop reinforcement is circular and has a fixed shape by itself. The hoop reinforcement is fixed to the main reinforcement by welding at the site. This requires assembly work such as welding at the site. If the reinforcing bar cage is formed by welding the hoop reinforcement to the main reinforcement at the factory, the reinforcing bar cage will take up space when transported from the factory to the site because the hoop reinforcement is circular and has a fixed shape by itself.

[0006] The objective of the present invention is to restrain multiple main reinforcing members with a restraining member at a factory, and reduce the space taken up by the restrained multiple main reinforcing members when transporting them from the factory to the site, compared to when the restraining member that restrains multiple main reinforcing members has a fixed shape on its own. [Means for solving the problem]

[0007] First aspect The group of reinforcing members described in the above is characterized by comprising a plurality of main reinforcing members formed in the shape of rods, plates or bundles arranged in parallel at intervals, and flexible fiber bundles arranged to extend in a cross direction intersecting the main reinforcing members and fixed to the main reinforcing members at crossing points where they intersect with the main reinforcing members, impregnated with resin at intervals, and having flexibility.

[0008] First aspect In the configuration described in the above, the fiber bundle is fixed to the main reinforcing member at an intersection portion where the fiber bundle intersects with the main reinforcing member. In other words, the fiber bundle restrains the multiple main reinforcing members. Here, the fiber bundle is flexible and does not have a fixed shape by itself. Therefore, for example, when a group of reinforcing members is assembled in a factory and transported from the factory to a site, the group of reinforcing members can be loaded flat on the bed of a truck, or the group of reinforcing members can be loaded rolled up on the bed of a truck.

[0009] Second aspect The reinforcing member group described in is characterized in that the main reinforcing members are steel bars.

[0010] Second aspect In the configuration described above, even if the main reinforcing member is a steel bar, the fiber bundle is flexible and does not have a fixed shape by itself, so that the group of reinforcing members can be loaded flat on the bed of a truck, or the group of reinforcing members can be loaded rolled up on the bed of a truck.

[0011] Third aspect The concrete structure according to the present invention is First or second aspectand a concrete portion formed so that the group of reinforcing members is disposed therein.

[0012] Third aspect In the configuration described in the above, a group of reinforcing members for reinforcing a concrete portion of a concrete structure is disposed inside the concrete portion. Here, the fiber bundles constituting the group of reinforcing members are flexible and do not have a fixed shape by themselves. Therefore, by assembling the group of reinforcing members at a factory, the number of assembly steps such as welding at the site can be reduced.

[0013] Fourth aspect The concrete structure according to the present invention is Third aspect In the concrete structure described in the above, the group of reinforcing members is arranged in a cylindrical shape with the axial direction of the main reinforcing member being vertical, and the concrete part is shaped like a column extending in the vertical direction with the cylindrical group of reinforcing members arranged inside.

[0014] Fourth aspect In the configuration described in the above, a group of reinforcing members for reinforcing a concrete portion of a concrete column, which is a concrete structure, is disposed inside the concrete portion. The group of reinforcing members is disposed in a cylindrical shape with the axial direction of the main reinforcing member being vertical. Here, the fiber bundle does not have a fixed shape by itself and has flexibility. Therefore, the group of reinforcing members in a factory-assembled state can be easily disposed in a cylindrical shape.

[0015] Fifth aspect The concrete structure according to the present invention is Third aspect In the concrete structure described in the above, the group of reinforcing members is arranged in a flat state with its faces facing vertically, the group of reinforcing members is arranged in a flat state inside the concrete part, and a floor surface facing upward is formed in the concrete part.

[0016] Fifth aspectIn the configuration described in the above, a group of reinforcing members for reinforcing a concrete portion of a floor slab, which is a concrete structure, is disposed inside the concrete portion. The group of reinforcing members is disposed flat with its surface facing vertically. Here, the fiber bundle does not have a fixed shape by itself and has flexibility. Therefore, the group of reinforcing members assembled in a factory can be easily disposed flat. Effect of the Invention

[0017] According to the present invention, compared to a case where a restraining member that restrains multiple main reinforcing members has a fixed shape on its own, it is possible to restrain multiple main reinforcing members with a restraining member at a factory, and reduce the space taken up by the restrained multiple main reinforcing members when transporting them from the factory to the site. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a plan view showing a reinforcing bar group according to a first embodiment of the present invention. [Diagram 2] 1A and 1B are cross-sectional views showing a reinforcing bar group according to a first embodiment of the present invention. [Diagram 3] 1A and 1B are perspective views showing fiber bundles constituting a reinforcing bar group according to a first embodiment of the present invention, and perspective views showing reinforcing bars constituting the reinforcing bar group. [Figure 4] 1A and 1B are perspective views showing a group of reinforcing bars constituting a reinforced concrete column according to a first embodiment of the present invention, and a perspective view showing a reinforced concrete column. [Diagram 5] 13A and 13B are perspective views showing temporary formwork and reinforcing bars constituting a floor slab according to a second embodiment of the invention, and a perspective view showing the floor slab. [Figure 6] FIG. 11 is a perspective view showing a modification of the first embodiment of the present invention. [Figure 7] 1A, 1B, and 1C are a plan view and a cross-sectional view showing a fiber bundle group according to a modified embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] First Embodiment A reinforcing bar group and a reinforced concrete column according to a first embodiment of the present invention will be described with reference to Figures 1 to 4. In the figures, arrow H indicates the vertical direction, arrows W and L indicate the horizontal direction, and arrows W and L are perpendicular to each other.

[0020] (Rebar group 10) As shown in Fig. 1, the reinforcing bar group 10 includes long reinforcing bars 14 (see Fig. 3(B)) and long fiber bundles 18. The reinforcing bar group 10 is an example of a reinforcing member group. The reinforcing bars 14 are an example of main reinforcing members.

[0021] Specifically, a plurality of reinforcing bars 14 are provided and are arranged in parallel with gaps in plan view. Also, the fiber bundles 18 are arranged so as to extend in a direction perpendicular to the reinforcing bars 14 in plan view. Furthermore, a plurality of fiber bundles 18 are provided and are arranged with gaps in the longitudinal direction of the reinforcing bars 14. As a result, the reinforcing bar group 10 has a lattice shape in plan view, and the reinforcing bars 14 and the fiber bundles 18 intersect at multiple points.

[0022] At the intersection points where the reinforcing bars 14 and the fiber bundles 18 intersect, as shown in Figures 2(A) and (B), the fiber bundles 18 are wrapped around the reinforcing bars 14 about one or two times, and the fiber bundles 18 are fixed to the reinforcing bars 14.

[0023] As shown in Fig. 2(A), the intersections of both ends of the reinforcing bar 14 are impregnated with resin 26, which increases the anchoring strength. As shown in Fig. 2(B), the intersections of both ends of the fiber bundle 18 are impregnated with resin 26, which increases the anchoring strength. Epoxy resin is used as the resin 26.

[0024] As shown in FIG. 3(A), the fiber bundle 18 is composed of a plurality of carbon fibers 22, and is impregnated with the resin 20 at intervals. In the present embodiment, as an example, the diameter of the carbon fibers 22 is 10 to 30 [mm]. Furthermore, about 3000 of these carbon fibers 22 are used. The resin 20 is impregnated at a pitch of about 10 to 100 [mm], and epoxy resin is used as the resin 20. The resin 20 functions as a binder that binds the plurality of carbon fibers 22. In this way, in the fiber bundle 18, the carbon fibers 22 are bundled by partial impregnation with the resin 20, thereby ensuring the necessary strength while maintaining flexibility.

[0025] With this configuration, the flexible fiber bundle 18 functions as a restraining member that restrains the multiple reinforcing bars 14.

[0026] The reinforcing bar group 10 is assembled in a factory, and the reinforcing bar group 10 assembled in the factory is placed on the bed of a truck and transported to the site. Here, the fiber bundle 18 has flexibility. Therefore, the reinforcing bar group 10 can be loaded flat on the bed of the truck, or the reinforcing bar group 10 can be loaded in a wound state on the bed of the truck.

[0027] (Reinforced concrete column 30) The reinforced concrete column 30 is an example of a concrete structure, and includes a concrete portion 34 having a rectangular cross section and a group of reinforcing bars 10 arranged inside the concrete portion 34, as shown in FIG. 4(B).

[0028] The construction process for the reinforced concrete column 30 will be described below. First, as shown in Fig. 4(A), the reinforcing bar group 10 is arranged so as to have a rectangular tubular shape when viewed from above by bending the flexible fiber bundle 18. Furthermore, concrete is poured in a state in which the reinforcing bar group 10 is surrounded by a formwork (not shown) to form the concrete portion 34.

[0029] In this configuration, the reinforcing bar group 10 arranged inside the concrete portion 34 functions as a reinforcing member for the concrete portion 34. Specifically, the reinforcing bars 14 constituting the reinforcing bar group 10 function as main reinforcements of the reinforced concrete column 30, and the fiber bundles 18 constituting the reinforcing bar group 10 function as hoop reinforcements of the reinforced concrete column 30.

[0030] (summary) As described above, in the reinforcing bar group 10, the fiber bundles 18 constituting the reinforcing bar group 10 do not have a fixed shape by themselves, but are flexible by themselves. As described above, the reinforcing bar group 10 is produced in a factory, and the reinforcing bar group 10 produced in the factory is placed on the bed of a truck and transported to the site. Since the fiber bundles 18 have flexibility, the reinforcing bar group 10 can be loaded flat on the bed of a truck, or loaded in a wound state on the bed of a truck. Therefore, compared to a case where a member that restrains multiple reinforcing bars 14 has a fixed shape by itself, it is possible to restrain multiple reinforcing bars 14 by the fiber bundles 18 in the factory and prevent the reinforcing bar group 10 from taking up space when transporting it from the factory to the site.

[0031] Furthermore, by assembling reinforcing bar group 10 in a factory, the number of assembly steps such as welding on site can be reduced.

[0032] Furthermore, in the reinforced concrete column 30, the reinforcing bars 10 can be easily arranged in a rectangular tubular shape by bending the flexible portions of the fiber bundles 18.

[0033] <Second embodiment> Next, a reinforcing bar group and a reinforced concrete structure according to a second embodiment of the present invention will be described with reference to Figures 5(A) and 5(B). Note that, regarding the second embodiment, the differences from the first embodiment will be mainly described.

[0034] (Floor slab 60) The floor slab 60 is an example of a concrete structure, and as shown in Figure 5 (B), comprises a temporary formwork 62, a concrete section 64 having an upward-facing floor surface 60a, and a group of reinforcing bars 10 arranged inside the concrete section 64.

[0035] The construction process of the floor slab 60 will be described below. First, the temporary formwork 62 is supported by a support (not shown). Then, as shown in Fig. 5(A), the reinforcing bars 10 in a flat state are supported on the temporary formwork 62 via a spacer (not shown). In this state, concrete is poured to form the concrete portion 64.

[0036] In this configuration, the reinforcing bar group 10 arranged inside the concrete portion 64 functions as a reinforcing member for the concrete portion 64. Specifically, the reinforcing bars 14 constituting the reinforcing bar group 10 function as main reinforcements of the floor slab 60, and the fiber bundles 18 constituting the reinforcing bar group 10 function as distribution reinforcements for the floor slab 60.

[0037] (summary) As described above, in the floor slab 60, the reinforcing bar group 10 in a flat state is supported by the temporary formwork 62 via a spacer (not shown). Therefore, the reinforcing bar group 10 can be easily arranged on-site compared to the case where the main reinforcement bars of the floor slab 60 and the distribution reinforcement bars of the floor slab 60 are arranged separately. In other words, the reinforcing bar group 10 in an assembled state can be easily arranged in a flat state.

[0038] Although the present invention has been described in detail with respect to the first and second embodiments, it is clear to those skilled in the art that the present invention is not limited to these embodiments and that various other embodiments are possible within the scope of the present invention. For example, in the above first and second embodiments, the carbon fibers 22 are used as the fibers constituting the fiber bundle 18, but the fibers may be, for example, aramid fibers, glass fibers, polyester fibers, etc.

[0039] Furthermore, in the above first and second embodiments, the resins 20 and 26 have been described by taking an example of epoxy resin, but they may be, for example, a thermosetting resin such as an unsaturated polyester resin.

[0040] In addition, in the above first embodiment, a reinforced concrete column 30 is used as an example of a concrete structure, and in the above second embodiment, a floor slab 60 is used as an example of a concrete structure, but the reinforced concrete structure may be a reinforced concrete beam using reinforcing bar groups 10 as reinforcing members, or a reinforced concrete wall using reinforcing bar groups 10 as reinforcing members.

[0041] In addition, in the first embodiment, the reinforced concrete column 30 has a rectangular cross section, but it may have a circular cross section or the like.

[0042] In the first and second embodiments, the fiber bundles 18 are arranged so as to extend in a direction perpendicular to the reinforcing bars 14, but they may extend in a direction intersecting the reinforcing bars 14.

[0043] In addition, in the above first embodiment, as shown in FIG. 4(A), the fiber bundle 18 was wound horizontally around multiple reinforcing bars 14 extending in the vertical direction, but as shown in FIG. 6, the fiber bundle 18 may be wound spirally around multiple reinforcing bars 14 extending in the vertical direction.

[0044] In the first and second embodiments, an example is shown in which the main reinforcing member is a reinforcing bar 14, but the main reinforcing member may be any member capable of bearing the tensile force generated in the concrete structure in place of concrete, and may be a rod-, plate- or bundle-shaped member made of a material other than a reinforcing bar.

[0045] For example, the main reinforcing member may be a fiber bundle, an FRP (Fiber Reinforced Plastics) rod, an FRP plate, a CFRP (Carbon Fiber Reinforced Plastics) rod, a CFRP plate, PC steel strands, or the like.

[0046] 7(A), 7(B) and 7(C) show a modified form of a fiber bundle group 80 serving as a reinforcing member group in which the main reinforcing member is a flexible fiber bundle 18. Note that with regard to the modified form, differences from the first embodiment will be mainly described.

[0047] As shown in Fig. 7(A), the fiber bundle group 80 as a reinforcing member group is formed from a plurality of fiber bundles 18. Specifically, the fiber bundle group 80 includes a plurality of fiber bundles 18 (hereinafter referred to as "fiber bundles 18a") arranged to extend in one direction in a plan view and spaced apart in an orthogonal direction perpendicular to the one direction. Furthermore, the fiber bundle group 80 includes a plurality of fiber bundles 18 (hereinafter referred to as "fiber bundles 18b") arranged to extend in the orthogonal direction in a plan view and spaced apart in one direction.

[0048] Furthermore, at the intersections between fiber bundles 18a and 18b, fiber bundle 18a is wound around fiber bundle 18b one or two times, as shown in Figures 7(B) and (C), so that fiber bundle 18a is fixed to fiber bundle 18b. Also, at both ends of fiber bundle 18b, as shown in Figure 7(B), resin 26 is impregnated at the intersections, so that the fixing strength is increased. Furthermore, at both ends of fiber bundle 18a, as shown in Figure 7(C), resin 26 is impregnated at the intersections, so that the fixing strength is increased.

[0049] 7(C), fiber bundle 18a is fixed to fiber bundle 18b by wrapping fiber bundle 18b around fiber bundle 18a one or two times and impregnating the wrapped portion with resin 26. Furthermore, fiber bundle 18a is fixed to fiber bundle 18b by wrapping fiber bundle 18b around fiber bundle 18b one or two times and impregnating the wrapped portion with resin 26.

[0050] In this configuration, by disposing the fiber bundle group 80 inside the concrete portion, the fiber bundle group 80 functions as a reinforcing member for the concrete portion.

[0051] (summary) As described above, in the fiber bundle group 80, the fiber bundles 18a and 18b constituting the fiber bundle group 80 do not have a fixed shape individually and are flexible individually. The fiber bundle group 80 is produced in a factory, and the fiber bundle group 80 produced in the factory is placed on the bed of a truck and transported to the site. Since the fiber bundles 18a and 18b are flexible, the fiber bundle group 80 can be loaded in a flat state on the bed of the truck, or the fiber bundle group 80 can be loaded in a wound state on the bed of the truck. This makes it possible to suppress the fiber bundle group 80 from taking up space when transporting it from the factory to the site. [Explanation of symbols]

[0052] 10 Reinforcing bars (an example of a reinforcing member group) 14 Steel bars (an example of a main reinforcing member) 18 Fiber bundle 20 Resin 26 Resin 30 Reinforced concrete column (an example of a concrete structure) 34 Concrete Section 60 Floor slab (an example of a concrete structure) 60a Floor 64 Concrete Section

Claims

1. A plurality of main reinforcing members formed in a rod, plate or bundle shape arranged in parallel at intervals; a fiber bundle that is arranged to extend in a cross direction crossing the main reinforcing member, is fixed to the main reinforcing member at an intersection portion crossing the main reinforcing member, is impregnated with a resin at intervals, and has flexibility; The main reinforcing member is a reinforcing bar, At least the intersecting portions at both ends of the reinforcing bar are impregnated with the resin. Reinforcement members.

2. A group of reinforcing members according to claim 1; a concrete portion formed so that the group of reinforcing members is disposed therein; and A concrete structure comprising:

3. The reinforcing member group is arranged in a cylindrical shape with an axial direction of the main reinforcing member being vertical, The concrete portion has a cylindrical reinforcing member group disposed therein and is formed into a columnar shape extending in the vertical direction. The concrete structure according to claim 2.

4. The reinforcing member group is arranged in a flat state with its surface facing vertically, The concrete portion has the group of reinforcing members arranged therein in a flat state, and the concrete portion has a floor surface facing upward. The concrete structure according to claim 2.

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