Reinforcement concrete structure, precast reinforcement concrete module provided therewith, and slab

Abstract

To provide a reinforcement concrete structure having sufficient strength in an axial direction of an opening and suppressed in increase of thickness, a precast reinforcement concrete module provided therewith, and a slab.SOLUTION: A reinforcement concrete structure having an opening 10P is provided with: a cylindrical body 11 forming the opening 10P; a reinforcement flat plate 12 provided with a through hole 12h into which the cylindrical body 11 is inserted and arranged along a surface orthogonal to an axial direction of the cylindrical body 11; and a reinforcement arrangement part 13 arranged on an outer peripheral side of the cylindrical body 11, wherein the reinforcement arrangement part 13 is provided with: a plate-like surrounding wall 13a extending along the axial direction from an outer peripheral edge of the reinforcement flat plate 12; and a reinforcement arrangement surface 13c extending in a direction along the reinforcement flat plate 12 and formed using a plurality of steel bars R engaged with at least one of the surrounding wall 13a and the reinforcement flat plate 12.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a reinforced concrete structure, a precast reinforced concrete module comprising the same, and a deck slab. [Background technology]

[0002] In reinforced concrete structures, openings may be provided. Patent Document 1 describes a structure in which radial reinforcement bars are attached to a plurality of overlapping circular hoops via anchor plates in order to provide an opening in a reinforced concrete structure. Patent Document 2 describes a structure that includes a circular steel pipe and a reinforcing steel plate that holds the circular steel pipe, in which an opening is formed in a reinforced concrete structure by providing the circular steel pipe, and splice reinforcement fixed to the reinforcing steel plate is connected to the main reinforcing bars that have been cut by the installation of the circular steel pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 62-55362 [Patent Document 2] Japanese Patent Application Laid-Open No. 2008-144415 Summary of the Invention [Problem to be solved by the invention]

[0004] When a pier with a reinforced concrete structure is placed over water, for example, there is a demand for openings in the reinforced concrete structure to allow sunlight to shine through the openings onto the area below the pier, promoting symbiosis with aquatic life. However, when openings are made in a reinforced concrete structure, the rebar is shredded, reducing the strength of the area around the opening. In addition, in order to allow sunlight to shine over a wider area through the openings, it is preferable to reduce the thickness of the reinforced concrete structure. In the structure described in Patent Document 1, the hoops provided to form the openings are reinforced only with reinforcing bars. This is expected to be advantageous in terms of reducing thickness and has high strength in the radial direction, but there are issues with strength in the axial direction. The structure described in Patent Document 2 is applied to, for example, wall structures. That is, the circular steel pipes are arranged so that their pipe axes are horizontal. Therefore, when this structure is applied to, for example, a deck structure, strength in the pipe axis direction becomes an issue. Increasing the number of reinforcing steel plates could be considered to improve the strength in the pipe axis direction, but this would result in an increase in the dimension in the pipe axis direction, i.e., the thickness of the structure.

[0005] The present disclosure has been made in consideration of the above-mentioned circumstances, and aims to provide a reinforced concrete structure that has sufficient strength in the axial direction of the opening and minimizes an increase in thickness, a precast reinforced concrete module equipped with the same, and a deck slab. [Means for solving the problem]

[0006] A reinforced concrete structure according to one aspect of the present disclosure is a reinforced concrete structure having an opening, comprising: a cylindrical body forming the opening; a reinforcing plate having a through hole through which the cylindrical body is inserted and arranged along a surface perpendicular to the axial direction of the cylindrical body; and a reinforcing bar arrangement portion arranged on the outer periphery of the cylindrical body, wherein the reinforcing bar arrangement portion comprises a plate-shaped peripheral wall extending from the outer peripheral edge of the reinforcing plate along the axial direction; and a reinforcing bar arrangement surface formed by a plurality of the reinforcing bars extending in a direction along the reinforcing plate and engaging with at least one of the peripheral wall and the reinforcing plate. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a reinforced concrete structure that has sufficient strength in the axial direction of the opening and minimizes an increase in thickness, as well as a precast reinforced concrete module and deck slab that include the same. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a pier according to an embodiment. [Figure 2] FIG. 2 is a perspective view showing the internal structure of the perforated module according to the first embodiment. [Figure 3] 3 is a partial plan view of the internal structure of the perforated module shown in FIG. 2. FIG. [Figure 4] 3 is a partial front view of the internal structure of the perforated module shown in FIG. 2. FIG. [Figure 5] FIG. 5 is an enlarged view of a portion V in FIG. [Figure 6] FIG. 6 is a detailed view of the rib shown in FIG. 5. [Figure 7] This is a modified example of the peripheral wall shown in FIG. [Figure 8] FIG. 8 is an enlarged view of part VIII in FIG. 7. [Figure 9] FIG. 10 is a plan view of a connection between modules with holes. [Figure 10] FIG. 10 is a cross-sectional front view of a connection portion between modules with holes. [Figure 11] This is an example in which a precast reinforced concrete module according to the second embodiment is installed on a pier. [Figure 12] FIG. 10 is a plan view of the module with the second hole. [Figure 13] FIG. 10 is a plan view of the module with a third hole. DETAILED DESCRIPTION OF THE INVENTION

[0009] (First embodiment) Hereinafter, a reinforced concrete structure, a precast reinforced concrete module, and a deck slab according to one embodiment of the present disclosure will be described with reference to the drawings. The reinforced concrete structure according to this embodiment has an opening formed so as to penetrate the reinforced concrete structure in the thickness direction. The reinforced concrete structure according to this embodiment is used, for example, as the deck of a pier. In this case, the reinforced concrete structure allows sunlight to pass through the openings. This allows sunlight to shine on the area below the pier, contributing to the coexistence of aquatic life. The deck according to this embodiment is formed from a plurality of precast reinforced concrete modules by appropriately arranging the plurality of precast reinforced concrete modules at a construction site and pouring concrete between the plurality of precast reinforced concrete modules. An example in which the reinforced concrete structure according to this embodiment is used for the deck of a pier will be described below.

[0010] FIG. 1 shows a pier B according to the embodiment. The deck F according to this embodiment is used, for example, for a pier B that is built on water, as shown in Fig. 1. The deck F according to this embodiment is constructed by arranging a plurality of precast reinforced concrete modules 100 vertically and horizontally along a horizontal plane. A challenge for the pier B on water is to achieve symbiosis with the organisms living below the deck F. The precast reinforced concrete modules 100 used for the deck F according to this embodiment include a plurality of perforated precast reinforced concrete modules 10 each having an opening 10P, as described below. This allows sunlight to shine through the openings 10P onto the water bottom where the piles of the pier B are driven. This allows seaweed and other plants to grow on the water bottom below the pier B, contributing to symbiosis with the organisms in the water area where the pier B is located.

[0011] As shown in FIG. 1 , the precast reinforced concrete module 100 according to this embodiment includes a perforated precast reinforced concrete module 10 with an opening 10P (hereinafter referred to as a perforated module 10) and a non-perforated precast reinforced concrete module 20 without an opening 10P (hereinafter referred to as a non-perforated module 20). In other words, the non-perforated module 20 differs from the perforated module 10 in that it does not have an opening 10P. In this embodiment, the floor slab F includes a plurality of perforated modules 10 and non-perforated modules 20. Hereinafter, when there is no need to distinguish between the perforated modules 10 and the non-perforated modules 20, they may be referred to as precast reinforced concrete modules 100. In the floor slab F according to this embodiment, concrete Cg is poured between the plurality of precast reinforced concrete modules 100 (details will be described later). This forms a floor slab F with openings 10P.

[0012] In this embodiment, the aperture ratio of the opening 10P in the perforated module 10 is 5% or more. That is, when the perforated module 10 is viewed from above, the area of ​​the opening 10P provided in the perforated module 10 is 5% or more of the area of ​​the region surrounded by the outline of the outer shape of the concrete Cp of the perforated module 10 (a rectangular region in this embodiment). This ensures the amount of sunlight reaching the water bottom when, for example, a deck slab F equipped with the perforated module 10 is used in a pier B.

[0013] Next, the holed module 10 according to this embodiment will be described. FIG. 2 is a perspective view showing the internal structure of the holed module 10 according to the first embodiment. FIG. 3 is a partial plan view of the internal structure of the perforated module 10 shown in FIG. FIG. 4 is a partial front view of the internal structure of the perforated module 10 shown in FIG. FIG. 5 is an enlarged view of part V in FIG. FIG. 6 is a detailed view of the rib 13b shown in FIG. FIG. 7 shows a modified example of the peripheral wall 13a shown in FIG. FIG. 8 is an enlarged view of part VIII in FIG. In addition, in FIG. 2 and subsequent figures, concrete Cp and Cg are shown by virtual lines. As described above, the perforated module 10 has an opening 10P. As shown in Figures 2 and 3, the perforated module 10 includes a cylindrical body 11, a reinforcing plate 12, and a reinforcing bar arrangement portion 13. In this embodiment, the perforated module 10 includes the reinforced concrete structure according to this embodiment. The cylindrical body 11 forms an opening 10P in the perforated module 10 (reinforced concrete structure). For example, a steel pipe is suitably used for the cylindrical body 11. The inner and outer diameters of the cylindrical body 11 are preferably determined appropriately based on the strength required of the cylindrical body 11 in the perforated module 10. The axial length of the cylindrical body 11 is preferably set to, for example, 300 to 600 mm, in accordance with the thickness of a general deck F. Hereinafter, in this embodiment, the axial direction of the cylindrical body 11 will be referred to as the axial direction D1. In this embodiment, the axial direction D1 is along the vertical direction. As described above, the floor slab F according to this embodiment is configured by arranging a plurality of precast reinforced concrete modules 100 lengthwise and widthwise along a horizontal plane. In other words, the precast reinforced concrete modules 100 are configured by arranging a plurality of precast reinforced concrete modules 100 lengthwise and widthwise along a direction perpendicular to the axial direction D1.

[0014] The reinforcing flat plate 12 is a flat plate arranged along a direction perpendicular to the axial direction D1 of the cylindrical body 11. For example, a steel plate is suitably used for the reinforcing flat plate 12. The reinforcing flat plate 12 has a through hole 12h through which the cylindrical body 11 is inserted. In other words, the reinforcing flat plate 12 is arranged along a plane perpendicular to the axial direction D1 of the cylindrical body 11 by placing the cylindrical body 11 inside the through hole 12h. In this embodiment, the reinforcing plate 12 is preferably joined to the cylindrical body 11 at the inner peripheral edge of the through hole 12h by welding or the like. This can improve the resistance of the reinforcing plate 12 to horizontal forces. That is, for example, the resistance when the reinforcing plate 12 is pulled horizontally by the reinforcing bar R can be improved. In this embodiment, one reinforcing plate 12 is provided for one perforated module 10. This preferably reduces the thickness of the perforated module 10 compared to, for example, a case where two or more reinforcing plates 12 are provided for the perforated module 10 along the axial direction D1 of the cylindrical body 11.

[0015] Here, in the thickness direction (axial direction D1) of the precast reinforced concrete module 100 according to this embodiment, the reinforcing plate 12 included in the perforated module 10 is located at a position shifted from the center to one side, as shown in FIG. 4 or FIG. 7, for example. That is, for example, the reinforcing plate 12 is located at a position shifted from the center to the upper side in the thickness direction of the precast reinforced concrete module 100. In other words, the reinforcing plate 12 is located at a position shifted from the center to one side (e.g., the upper side) in the axial direction D1 with respect to the cylindrical body 11. In other words, in the axial direction D1 of the cylindrical body 11, the distance from one end face of the perforated module 10 to the reinforcing plate 12 is different from the distance from the other end face to the reinforcing plate 12. Specifically, in the axial direction D1 of the cylindrical body 11, the distance from the upper end face of the perforated module 10 to the reinforcing plate 12 is shorter than the distance from the lower end face to the reinforcing plate 12. That is, in the axial direction D1 of the cylindrical body 11, the distance from the upper end face of the perforated module 10 to the reinforcing plate 12 shown in FIG. 4 or FIG. 7 is shorter than the distance from the lower end face to the reinforcing plate 12. t But, t b This allows a larger amount of concrete Cp to be poured below the reinforcing plate 12. This makes it possible to delay deterioration of the reinforcing plate 12 due to seawater, etc., when the precast reinforced concrete module 100 is used for the deck F of a pier B at sea, for example.

[0016] The reinforcing bar arrangement section 13 is arranged on the outer periphery of the cylindrical body 11. The reinforcing bar arrangement section 13 is a portion where reinforcing bars R to be provided in the precast reinforced concrete module 100 are arranged. For example, as shown in FIG. 2, the reinforcing bar arrangement section 13 includes a peripheral wall 13a, a rib 13b, and a reinforcing bar arrangement surface 13c. The peripheral wall 13a is a plate-like member extending from the outer peripheral edge of the reinforcing plate 12 along the axial direction D1, as shown in, for example, FIGS. 2, 4, and 7. The peripheral wall 13a is provided, for example, with the same steel plate as the reinforcing plate 12. The reinforcing plate 12 and the peripheral wall 13a are joined, for example, by welding. In this embodiment, the peripheral wall 13a extends from the outer peripheral edge of the reinforcing plate 12 toward both sides in the axial direction D1. The peripheral wall 13a has a plurality of engagement portions 13d for engaging with the reinforcing bars R, spaced apart in a direction perpendicular to the axial direction D1. Details of the engagement portions 13d and the reinforcing bars R engaged with the engagement portions 13d will be described later.

[0017] 2 and 3, the peripheral wall 13a is provided in an annular shape along the outer periphery of the reinforcing flat plate 12. In this embodiment, the peripheral wall 13a being annular means that the peripheral wall 13a is provided without gaps along the circumferential direction of the cylindrical body 11. In this embodiment, the peripheral wall 13a is provided so as to form, for example, a rectangular tube. However, the peripheral wall 13a may be provided so as to form, for example, a cylindrical shape.

[0018] The rib 13b connects the reinforcing plate 12 and the peripheral wall 13a, for example, as shown in Figures 5 and 6. This reinforces the joint between the reinforcing plate 12 and the peripheral wall 13a, contributing to improving the strength of the perforated module 10. As shown in Figure 5, in the axial direction D1, the end of the rib 13b is located between the end of the peripheral wall 13a and the rebar arrangement surface 13c located adjacent to the end of the peripheral wall 13a. This preferably ensures that the rib 13b has a sufficient effect of reinforcing the joint between the reinforcing plate 12 and the peripheral wall 13a.

[0019] The reinforcing bar arrangement surface 13c is an imaginary surface formed by a plurality of reinforcing bars R that extend in a direction along the reinforcing plate 12 and engage with at least one of the peripheral wall 13a and the reinforcing plate 12. In this embodiment, the reinforcing bar arrangement surface 13c is formed, for example, in a direction perpendicular to the axial direction D1. For example, two reinforcing bar arrangement surfaces 13c are provided on the peripheral wall 13a along the axial direction D1. This preferably ensures the strength of the perforated module 10.

[0020] In this embodiment, the two reinforcing bar arrangement surfaces 13c are formed by arranging a plurality of U-shaped reinforcing bars R along a direction perpendicular to the axial direction D1, as shown in Figures 2, 4, and 7. In other words, in this embodiment, each of the plurality of reinforcing bars R arranged along the axial direction D1 is a single continuous reinforcing bar. This makes it possible to fix the relative positions of the precast reinforced concrete modules 100 at the boundaries between the precast reinforced concrete modules 100 without forming joints between the reinforcing bars R by means of joints, welding, or the like (details will be described later).

[0021] The reinforcing bar R is engaged with the engaging portion 13d. In this embodiment, the reinforcing bar R has a male thread portion Rs at its end, as shown in Figs. 5 and 8, for example. The reinforcing bar R is fixed to the engaging portion 13d by screwing the anchoring plate N onto the male thread portion Rs. The anchoring plate N is, for example, a known nut. However, the anchoring plate N may be a separate plate having a female thread portion corresponding to the male thread portion Rs of the reinforcing bar R. Furthermore, when a known nut is used for the anchoring plate N, a known washer may be provided between the anchoring plate N and the peripheral wall 13a. Hereinafter, first and second examples of the engaging portion 13d according to this embodiment will be described.

[0022] (First example of engagement portion 13d) 4 and 5, the engagement portions 13d according to the first example are through holes formed in the peripheral wall 13a. In other words, the peripheral wall 13a has through holes that penetrate in the plate thickness direction, and the multiple reinforcing bars R are engaged with the through holes. That is, in the engagement portions 13d according to the first example, the ends of the reinforcing bars R are engaged by being inserted into the engagement portions 13d, which are through holes. Thereafter, the fixing plate N is screwed onto the male thread portions Rs of the reinforcing bars R, thereby fixing the reinforcing bars R to the peripheral wall 13a.

[0023] (Second example of engagement portion 13d) 7 and 8, the engagement portion 13d according to the second example is a notch formed in the peripheral wall 13a. In other words, the peripheral wall 13a has notches formed in a shape that extends from the end in the axial direction D1 toward the inside in the planar direction, and the multiple reinforcing bars R are engaged with the notches. That is, in the engagement portion 13d according to the second example, the end of the reinforcing bar R is engaged by being positioned so as to be inserted into the engagement portion 13d, which is a notch. Thereafter, the fixing plate N is screwed onto the male thread portion Rs of the reinforcing bar R, thereby fixing the reinforcing bar R to the peripheral wall 13a. With the above configuration, a module 10 with holes (reinforced concrete structure) is formed.

[0024] FIG. 9 is a plan view of the connection between the holed modules 10. FIG. FIG. 10 is a cross-sectional view of the connection between the holed modules 10 as seen from the front. As described above, the deck F according to this embodiment is provided with a plurality of perforated modules 10 and a plurality of non-perforated modules 20. In the deck F, the precast reinforced concrete modules 100, i.e., the perforated modules 10, the non-perforated modules 20, and the perforated modules 10 and the non-perforated modules 20, are joined and fixed to one another by appropriately arranging the reinforcing bars R protruding from the concrete of the precast reinforced concrete modules 100 so that they overlap in the direction in which the modules are arranged, and then pouring concrete Cg.

[0025] In this embodiment, there are no joints for the reinforcing bars R at the boundaries between the precast reinforced concrete modules 100. In other words, the reinforcing bars provided in each of the precast reinforced concrete modules 100 are not joined to each other by joint members, welding, or the like, and the relative positions of the precast reinforced concrete modules 100 are fixed. Hereinafter, the structure of the reinforcing bars R provided in the precast reinforced concrete module 100 will be described in detail using the perforated module 10 as an example. Note that the structure of the reinforcing bars R is the same in the non-perforated module 20, so a description of the non-perforated module 20 will be omitted.

[0026] In this embodiment, the reinforcing bars R provided in the perforated module 10 have bent portions Rb, as shown in Figures 2, 4, and 7. As described above, the bent portions Rb are provided so as to connect the reinforcing bars R that form each of the two reinforcing bar arrangement surfaces 13c provided along the axial direction D1. That is, the reinforcing bars R provided in the perforated module 10 are U-shaped. In other words, in this embodiment, each of the multiple reinforcing bars R provided along the axial direction D1 is a single continuous reinforcing bar. In the perforated module 10, a plurality of U-shaped reinforcing bars R are arranged along a direction perpendicular to the axial direction D1. Both ends of the U-shaped reinforcing bars R are engaged with the peripheral wall 13a as described above. As a result, the plurality of U-shaped reinforcing bars R form a comb-like shape at the outer periphery of the perforated module 10, as shown in FIG.

[0027] The perforated modules 10 having the reinforcing bars R as described above are joined together as shown in FIGS. That is, first, as shown in Fig. 9, adjacent holed modules 10 are arranged so that comb-tooth-shaped portions formed by the reinforcing bars R of each of the adjacent holed modules 10 interlock with each other. For this reason, it is preferable that the reinforcing bars R of the adjacent holed modules 10 are arranged so that the reinforcing bars R of the adjacent holed modules 10 are positioned alternately.

[0028] In this embodiment, in order to arrange the reinforcing bars R of adjacent holed modules 10 so as to be positioned alternately, the holed modules 10 have the following configuration. That is, in the circumferential direction of the peripheral wall 13a of the perforated module 10, the reinforcing bars R are provided at positions offset from the reference positions BL. The reference position BL is the position before the reinforcing bars R are offset in the circumferential direction of the perforated module 10. For example, when the reinforcing bars R of adjacent perforated modules 10 are located at the reference position BL, and the perforated modules 10 are arranged side by side, the ends of the reinforcing bars R are butted against each other. Therefore, in this embodiment, when the holed module 10 is viewed from above as shown in Fig. 9, the reinforcing bar R is offset, for example, in a counterclockwise direction from a reference position BL in the circumferential direction of the holed module 10. The offset amount of the reinforcing bar R is a distance from the reference position BL that corresponds to the diameter Rd of the reinforcing bar R. Note that the reinforcing bar R may also be offset, for example, in a clockwise direction from the reference position BL in the circumferential direction of the holed module 10.

[0029] By offsetting each of the reinforcing bars R provided in the holed modules 10 as described above, the reinforcing bars R facing each other between adjacent holed modules 10 are offset in different directions as shown in Fig. 9. Therefore, the reinforcing bars R of the holed modules 10 are arranged so that they are positioned alternately.

[0030] Then, as shown in Fig. 10, concrete Cg is poured at the boundary between adjacent holed modules 10. This joins adjacent holed modules 10. Note that, as shown in Figs. 9 and 10, reinforcing steel bars R2 may be provided in an interlocking comb-teeth shape to reinforce the joining structure between the holed modules 10. In the above manner, the deck F is formed by the reinforced concrete structure according to this embodiment.

[0031] As described above, in the perforated module 10 according to this embodiment, the reinforcing bar arrangement portion 13 includes a reinforcing bar arrangement surface 13c formed by a plurality of reinforcing bars R. The plurality of reinforcing bars R forming the reinforcing bar arrangement surface 13c extend in a direction along the reinforcing plate 12 and engage with at least one of the peripheral wall 13a and the reinforcing plate 12. By providing a plurality of reinforcing bars R extending along the reinforcing plate 12 in this manner, the perforated module 10 can be provided with sufficient strength in the axial direction D1 of the opening 10P (cylindrical body 11). Furthermore, by arranging the plurality of reinforcing bars R in a straight line to form the reinforcing bar arrangement surface 13c, it is possible to reduce the area in which the reinforcing bars R are arranged, for example, above and below the precast reinforced concrete module 100 or the floor slab F. This makes it easier to prevent an increase in thickness.

[0032] Furthermore, the rebar arrangement surface 13c is disposed within the range in the axial direction D1 where the peripheral wall 13a exists, which allows the thickness of the perforated module 10 to be reduced compared to, for example, a case in which the rebar arrangement surface 13c is disposed outside the range in the axial direction D1 where the peripheral wall 13a exists.

[0033] Furthermore, one reinforcing plate 12 is provided for the cylindrical body 11. Here, for example, if a structure is provided in which multiple reinforcing plates 12 connected to reinforcing bars R are provided in the axial direction D1 of the cylindrical body 11, the spacing at which the reinforcing plates 12 can be arranged in the axial direction D1 of the cylindrical body 11 becomes larger than the spacing at which the reinforcing bar arrangement surfaces 13c can be arranged on the peripheral wall 13a, resulting in a larger thickness of the perforated module 10. Alternatively, the spacing at which the reinforcing plates 12 are arranged along the axial direction D1 becomes narrower, which may cause manufacturing problems. By providing the reinforcing bar arrangement surfaces 13c on the peripheral wall 13a, the above-mentioned problem can be prevented. Furthermore, by not providing multiple reinforcing plates 12, the weight of the perforated module 10 can be made relatively light. Furthermore, by reducing the thickness of the perforated module 10, for example, when sunlight is irradiated through the opening 10P below the pier B equipped with the perforated module 10, the area that can be exposed to sunlight can be increased.

[0034] Moreover, the peripheral wall 13a is provided in an annular shape along the outer peripheral edge of the reinforcing flat plate 12. This, for example, can further improve the strength of the holed module 10. Specifically, for example, it can improve the strength of the holed module 10 against an external force applied so as to twist it.

[0035] Additionally, the peripheral wall 13a has cutouts formed in a shape that extends from the end of the axial direction D1 of the cylindrical body 11 to the inside in the planar direction. A plurality of reinforcing bars R are engaged with the cutouts. This allows the engaging portions 13d to engage with the reinforcing bars R by inserting the ends of the reinforcing bars R into the engaging portions 13d, which are the cutouts. This facilitates the engagement between the peripheral wall 13a and the reinforcing bars R, thereby improving workability at the construction site.

[0036] Additionally, the peripheral wall 13a has through holes that penetrate in the plate thickness direction. A plurality of reinforcing bars R are engaged with the through holes. This allows the engaging portions 13d to engage with the reinforcing bars R by inserting the ends of the reinforcing bars R into the engaging portions 13d, which are through holes. This facilitates the engagement between the peripheral wall 13a and the reinforcing bars R, thereby improving workability at the construction site.

[0037] Furthermore, the end of the reinforcing bar R has a male threaded portion Rs. The reinforcing bar R is fixed to the engaging portion 13d by screwing the anchoring plate N onto the male threaded portion Rs. In other words, the male threaded portion Rs of the reinforcing bar R and the engaging portion 13d are fixed via the anchoring plate N. This makes the work easier than, for example, when the reinforcing bar R is fixed by welding to the peripheral wall 13a. Therefore, the workability at the construction site of the perforated module 10 can be improved.

[0038] Furthermore, the reinforcing bar R has a bent portion Rb, which makes it easier to connect a plurality of holed modules 10 together. That is, the holed modules 10 can be joined together without forming joints between the reinforcing bars R at the boundaries between the holed modules 10.

[0039] The module 10 further includes ribs 13b that connect the reinforcing plate 12 and the peripheral wall 13a, thereby reinforcing the connection between the reinforcing plate 12 and the peripheral wall 13a, thereby further improving the strength of the module 10 with a hole.

[0040] Furthermore, the ends of the ribs 13b are located between the ends of the peripheral wall 13a and the arrangement surface located adjacent to the ends of the peripheral wall 13a in the axial direction D1 of the cylindrical body 11. This prevents the ends of the ribs 13b from protruding from the ends of the peripheral wall 13a in the axial direction D1, and allows the ribs 13b to fully enhance the effect of reinforcing the joint between the reinforcing plate 12 and the peripheral wall 13a.

[0041] Furthermore, according to the precast reinforced concrete module 100 of this embodiment, the opening ratio of the openings 10P provided in the perforated modules 10 of the precast reinforced concrete module 100 is 5% or more. This allows, for example, sufficient sunlight to reach below the precast reinforced concrete module 100 through the openings 10P of the perforated modules 10.

[0042] Furthermore, each of the multiple reinforcing bars R is a single continuous reinforcing bar. This makes it possible to eliminate joints between the reinforcing bars R at the boundaries between the perforated modules 10, and eliminates the need for work to join the reinforcing bars R at the construction site of the deck F. This improves workability at the construction site.

[0043] Furthermore, in the axial direction D1 of the cylindrical body 11 of the perforated module 10, the distance from one end face to the reinforcing plate 12 is different from the distance from the other end face to the reinforcing plate 12. In other words, the reinforcing plate 12 is located at a position shifted from the center to one side in the thickness direction of the precast reinforced concrete module 100. As a result, for example, when the precast reinforced concrete module 100 is used for the deck F of a pier B, the reinforcing plate 12 can be located above the center in the thickness direction (axial direction D1) of the perforated module 10. In this case, the thickness of the concrete Cp poured below the reinforcing plate 12 in the perforated module 10 can be made thicker than when the reinforcing plate 12 is located at the center in the thickness direction (axial direction D1) of the perforated module 10. Therefore, for example, when seawater hits the underside of the perforated module 10, deterioration of the perforated module 10 due to rust or the like can be delayed.

[0044] Furthermore, the deck F according to this embodiment is configured by arranging a plurality of precast reinforced concrete modules 100, each with an opening ratio of 5% or more, in a direction perpendicular to the axial direction D1 of the cylindrical body 11. This allows sufficient sunlight to reach the lower part of the deck F. Therefore, for example, when the deck F is used for a pier B, it can contribute to symbiosis with living organisms in the water area where the pier B is installed.

[0045] Furthermore, the module 10 is configured by arranging a plurality of precast reinforced concrete modules 100 in a direction perpendicular to the axial direction D1 of the cylindrical body 11, in which the distance from one end face to the reinforcing plate 12 is different from the distance from the other end face to the reinforcing plate 12 in the axial direction D1 of the cylindrical body 11. This allows, for example, the reinforcing plate 12 to be positioned above the center in the thickness direction of the module 10 with a hole. Therefore, as described above, deterioration of the module 10 with a hole due to rust or the like can be delayed.

[0046] (Second embodiment) Next, a precast reinforced concrete module 100 according to a second embodiment of the present disclosure will be described with reference to FIGS. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, with only the differences being described. FIG. 11 shows an example in which a precast reinforced concrete module 100 according to the second embodiment is installed on a pier B. As shown in Figure 11, the precast reinforced concrete module 100 of the second embodiment includes, in addition to the perforated module 10 and the non-perforated module 20 described in the first embodiment, a second perforated module 10a, a third perforated module 10b, a second non-perforated module 20a, and a third non-perforated module 20b.

[0047] The second perforated module 10a and the third perforated module 10b each have a plurality of openings 10P. That is, in the second embodiment, as shown in FIG. 11, one precast reinforced concrete module 100 may have a plurality of cylindrical bodies 11. This allows the size of one precast reinforced concrete module 100 to be increased while maintaining the opening ratio of the openings 10P. Therefore, for example, it is possible to reduce the amount of concrete Cg to be poured at the construction site and the man-hours required for pouring the concrete Cg. This makes construction work more efficient.

[0048] FIG. 12 is a plan view of the second holed module 10a. As shown in Figure 12, the second module with a hole 10a has two cylindrical bodies 11. Specifically, the second module with a hole 10a has two cylindrical bodies 11 arranged in series. Alternatively, the second module with a hole 10a may have three or more cylindrical bodies 11 arranged in series. The second module with a hole 10a formed in this manner is arranged, for example, so that the direction in which the cylindrical bodies 11 are arranged as described above is along the bridge axis direction of the pier B or a direction perpendicular to the bridge axis, as shown in Figure 11.

[0049] In the second embodiment, the second perforated module 10a is formed, for example, by a plurality of perforated unit members 10c. In the example shown in FIG. 12, each of the perforated unit members 10c has the same configuration as the perforated module 10 in the first embodiment. The configuration of each perforated unit member 10c is denoted by the same reference numerals as the perforated module 10, and description thereof will be omitted. The second perforated module 10a is formed by arranging a plurality of perforated unit members 10c in one direction. When the second perforated module 10a is formed in this manner, concrete Cp is simultaneously poured into the perforated unit members 10c arranged as described above. The concrete Cp is poured in advance, for example, not at the construction site but at a factory. The second perforated module 10a is transported as a whole from the factory to the construction site. Furthermore, reinforcing bars R2 (not shown in FIG. 12) as shown in FIG. 10 may be provided between the reinforcing bars R facing each other in the perforated unit members 10c arranged as described above.

[0050] FIG. 13 is a plan view of the third holed module 10b. As shown in FIG. 13, four cylindrical bodies 11 are provided in the third module with holes 10b. Specifically, the third module with holes 10b is provided with two cylindrical bodies 11 lined up in each of two mutually perpendicular directions. Alternatively, the third module with holes 10b may be provided with three or more cylindrical bodies 11 lined up in each of two mutually perpendicular directions. Furthermore, the number of cylindrical bodies 11 lined up in each of the two mutually perpendicular directions may be different. The third module with holes 10b formed in this manner is, for example, arranged so that the two directions in which the cylindrical bodies 11 are lined up as described above are along the bridge axis direction of pier B or a direction perpendicular to the bridge axis, as shown in FIG. 11.

[0051] In the second embodiment, the third perforated module 10b is formed, for example, by a plurality of perforated unit members 10c. That is, the third perforated module 10b is formed by arranging a plurality of perforated unit members 10c alternately in two mutually perpendicular directions. When the third perforated module 10b is formed in this manner, concrete Cp is simultaneously poured into the plurality of perforated unit members 10c arranged as described above. The concrete Cp is poured in advance, for example, not at the construction site but at a factory. The third perforated module 10b is transported as a unit from the factory to the construction site. Furthermore, reinforcing bars R2 (not shown in FIG. 13) as shown in FIG. 10 may be provided between the reinforcing bars R facing each other in the plurality of perforated unit members 10c arranged as described above.

[0052] The second module without a hole 20a differs from the second module with a hole 10a in that it does not include the cylindrical body 11. The third module without a hole 20b differs from the third module with a hole 10b in that it does not include the cylindrical body 11. The second no-hole module 20a and the third no-hole module 20b are formed, for example, by a plurality of no-hole unit members (not shown). Each of the no-hole unit members has the same configuration as the no-hole module 20 in the first embodiment. Explanation of the configuration of each of the no-hole unit members will be omitted. The arrangement of the plurality of no-hole unit members in the second no-hole module 20a and the third no-hole module 20b is the same as in the second module with a hole 10a and the third module with a hole 10b described above, so explanation will be omitted. It is also possible to mix unit members 10c with holes and unit members without holes to form the precast reinforced concrete module with holes 10. For example, the precast reinforced concrete module with holes 10 may be formed by arranging a unit member without holes so that it is sandwiched between a pair of unit members 10c with holes, or conversely, the precast reinforced concrete module with holes 10c may be formed by arranging a unit member with holes 10c so that it is sandwiched between a pair of unit members without holes. Furthermore, the arrangement pitch of the multiple openings 10P in the perforated precast reinforced concrete module 10 does not necessarily have to correspond to the dimensions of the perforated unit members 10c. In other words, the distance between two adjacent perforated unit members 10c in the arranging direction may be greater than the length of the perforated unit members 10c in the arranging direction, and the multiple openings 10P may be arranged in a staggered pattern. In this way, the arrangement pitch and arrangement form of the multiple openings 10P in the perforated precast reinforced concrete module 10 are not limited to those shown in the drawings.

[0053] As described above, the precast reinforced concrete module 100 according to the second embodiment has a plurality of openings 10P. In other words, a large precast reinforced concrete module 100 is formed by a plurality of precast reinforced concrete modules 100. This reduces the amount of work required for construction at the construction site, thereby improving the efficiency of construction work.

[0054] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure. For example, in the module 10 with holes, three or more rows of rebar arrangement surfaces 13c may be provided. Further, between the reinforcing bar arrangement surfaces 13c formed by the reinforcing bars R engaged with the peripheral wall 13a of the module 10 with a hole, other reinforcing bars R may be arranged. The peripheral wall 13a may extend from the outer peripheral edge of the reinforcing plate 12 toward one side in the axial direction D1. In this case, it is preferable that the peripheral wall 13a extends only downward from the outer peripheral edge of the reinforcing plate 12 on the pier B. This makes it possible to increase the amount of concrete Cp poured below the reinforcing plate 12, for example, and to delay deterioration of the reinforcing plate 12 due to seawater, etc.

[0055] In addition, within the scope of the present disclosure, the components in the above-described embodiments may be replaced with well-known components as appropriate, and the above-described modified examples may be combined as appropriate.

[0056] (Addendum) The reinforced concrete structure according to the embodiment, the precast reinforced concrete module including the same, and the deck slab can be understood, for example, as follows.

[0057] (Appendix 1) <1> A reinforced concrete structure according to one aspect of the present disclosure is a reinforced concrete structure having an opening, comprising: a cylindrical body forming the opening; a reinforcing plate having a through hole through which the cylindrical body is inserted and arranged along a surface perpendicular to the axial direction of the cylindrical body; and a reinforcing bar arrangement portion arranged on the outer periphery of the cylindrical body, wherein the reinforcing bar arrangement portion comprises a plate-shaped peripheral wall extending from the outer peripheral edge of the reinforcing plate along the axial direction; and a reinforcing bar arrangement surface formed by a plurality of reinforcing bars extending in a direction along the reinforcing plate and engaging with at least one of the peripheral wall and the reinforcing plate.

[0058] According to the above-mentioned module with a hole, the reinforcing bar arrangement portion has a reinforcing bar arrangement surface formed by a plurality of reinforcing bars. The plurality of reinforcing bars forming the reinforcing bar arrangement surface extend in a direction along the reinforcing plate and engage with at least one of the peripheral wall and the reinforcing plate. By providing a plurality of reinforcing bars extending along the reinforcing plate in this way, the module with a hole can be provided with sufficient strength in the axial direction of the opening (cylindrical body). Furthermore, by arranging a plurality of reinforcing bars in a straight line to form the reinforcing bar arrangement surface, it is possible to reduce the area in which the reinforcing bars are arranged, for example, above and below the precast reinforced concrete module or floor slab. This makes it easier to suppress an increase in thickness.

[0059] <2> the above <1> In the reinforced concrete structure according to the above, a configuration may be adopted in which the reinforcing bar arrangement surface is arranged within a range in which the peripheral wall exists in the axial direction.

[0060] In addition, the rebar arrangement surface is arranged within the range in the axial direction where the peripheral wall exists, which allows the thickness of the perforated module to be reduced compared to, for example, when the rebar arrangement surface is arranged outside the range in the axial direction where the peripheral wall exists.

[0061] <3> the above <1> or <2> In the reinforced concrete structure according to the above, a configuration may be adopted in which one reinforcing flat plate is provided for each of the cylindrical bodies.

[0062] Furthermore, one reinforcing plate is provided for each cylindrical body. Here, for example, if a structure is provided with multiple reinforcing plates with reinforcing bars connected thereto in the axial direction of the cylindrical body, the spacing at which the reinforcing plates can be arranged in the axial direction of the cylindrical body would be greater than the spacing at which the reinforcing bar arrangement surfaces can be arranged on the peripheral wall, resulting in a larger thickness of the perforated module. Alternatively, the spacing at which the reinforcing plates are arranged along the axial direction would be narrower, which could cause manufacturing problems. By providing the reinforcing bar arrangement surfaces on the peripheral wall, the aforementioned problems can be prevented. Furthermore, by not providing multiple reinforcing plates, the weight of the perforated module can be made relatively light. Furthermore, by reducing the thickness of the perforated module, the area that can be exposed to sunlight through an opening can be increased, for example, when sunlight is irradiated below a pier equipped with the perforated module.

[0063] <4> the above <1> from <3> In the reinforced concrete structure according to any one of the above aspects, a configuration may be adopted in which the peripheral wall is provided in a ring shape along the outer periphery of the reinforcing flat plate.

[0064] The peripheral wall is provided in an annular shape along the outer periphery of the reinforcing plate. This can further improve the strength of the perforated module, for example. Specifically, it can improve the strength of the perforated module against external forces that may be applied to twist the perforated module.

[0065] <5> the above <1> from <4> In any one of the above reinforced concrete structures, the peripheral wall may have a notch formed in a shape that extends from the axial end to the interior in the face direction, and the multiple reinforcing bars may be engaged with the notch.

[0066] The peripheral wall also has notches formed in a shape that extends from the axial end of the cylindrical body to the interior in the planar direction. A plurality of reinforcing bars are engaged with the notches. The engaging portions and the reinforcing bars can be engaged by inserting the ends of the reinforcing bars into the engaging portions, which are the notches. This facilitates engagement between the peripheral wall and the reinforcing bars, thereby improving workability at the construction site.

[0067] <6> the above <1> from <5> In any one of the above reinforced concrete structures, the peripheral wall may have through holes penetrating in the thickness direction of the plate, and the plurality of reinforcing bars may be engaged with the through holes.

[0068] The peripheral wall also has through holes that penetrate through the plate thickness direction. A plurality of reinforcing bars are engaged with the through holes. This allows the reinforcing bars to be engaged with the engaging portions by inserting the ends of the reinforcing bars into the through holes. This facilitates engagement between the peripheral wall and the reinforcing bars, thereby improving workability at the construction site.

[0069] <7> the above <1> from <6> In any one of the above reinforced concrete structures, the end of the reinforcing bar may have a male threaded portion, and the reinforcing bar may be fixed to at least one of the peripheral wall and the reinforcing flat plate by screwing an anchoring plate into the male threaded portion.

[0070] The end of the reinforcing bar is provided with a male threaded portion. The reinforcing bar is fixed to the engagement portion by screwing an anchoring plate onto the male threaded portion. In other words, the male threaded portion of the reinforcing bar and the engagement portion are fixed via the anchoring plate. This makes the work easier than, for example, when the reinforcing bar is fixed by welding to the surrounding wall. Therefore, the workability at the construction site of the perforated module can be improved.

[0071] <8> the above <1> from <7> In the reinforced concrete structure according to any one of the above aspects, a configuration may be adopted in which the reinforcing bars have bent portions.

[0072] The reinforcing bars also have bent sections, which facilitates the connection of multiple perforated modules together, i.e., the perforated modules can be joined together without forming joints between the reinforcing bars at the boundaries between the perforated modules.

[0073] <9> the above <1> from <8> In the reinforced concrete structure according to any one of the above aspects, a configuration may be adopted in which the structure further comprises a rib connecting the reinforcing plate and the peripheral wall.

[0074] Furthermore, the module further includes a rib connecting the reinforcing plate and the peripheral wall, which reinforces the connection between the reinforcing plate and the peripheral wall, thereby further improving the strength of the module with a hole.

[0075] <10> the above <9> In the reinforced concrete structure according to the present invention, a configuration may be adopted in which, in the axial direction, the end of the rib is located between the end of the peripheral wall and the reinforcing bar arrangement surface located next to the end of the peripheral wall.

[0076] In addition, in the axial direction of the cylindrical body, the ends of the ribs are located between the end of the peripheral wall and the arrangement surface located adjacent to the end of the peripheral wall, so that the ends of the ribs do not protrude beyond the end of the peripheral wall in the axial direction, and the effect of the ribs in reinforcing the joint between the reinforcing plate and the peripheral wall can be fully enjoyed.

[0077] <11> The precast reinforced concrete module according to one aspect of the present disclosure comprises: <1> from <10> A precast reinforced concrete module having a reinforced concrete structure according to any one of the above aspects, characterized in that the opening ratio of the openings provided in the precast reinforced concrete module is 5% or more.

[0078] According to the precast reinforced concrete module, the aperture ratio of the openings in the perforated modules of the precast reinforced concrete module is 5% or more, which allows sufficient sunlight to reach below the precast reinforced concrete module through the openings in the perforated modules, for example.

[0079] <12> the above <11> In the precast reinforced concrete module according to the above, a configuration may be adopted in which each of the plurality of reinforcing bars is a single continuous reinforcing bar.

[0080] Furthermore, each of the multiple reinforcing bars is a single continuous reinforcing bar. This eliminates the need for reinforcing bar joints at the boundaries between the perforated modules, eliminating the need for work to join reinforcing bars at the deck construction site. This improves workability at the construction site.

[0081] <13> the above <11> or <12> In the precast reinforced concrete module according to the present invention, a configuration may be adopted in which the distance from the end face on one side to the reinforcing flat plate in the axial direction is different from the distance from the end face on the other side to the reinforcing flat plate.

[0082] Furthermore, the distance from one end face to the reinforcing plate in the axial direction of the cylindrical body of the perforated module is different from the distance from the other end face to the reinforcing plate. In other words, the reinforcing plate is located at a position shifted from the center to one side in the thickness direction of the precast reinforced concrete module. This allows, for example, when the precast reinforced concrete module is used as a pier deck, the reinforcing plate to be positioned above the center in the thickness direction (axial direction) of the perforated module. In this case, the thickness of the concrete poured below the reinforcing plate in the perforated module can be made thicker than when the reinforcing plate is located at the center in the thickness direction (axial direction) of the perforated module. Therefore, for example, when seawater hits the underside of the perforated module, deterioration of the perforated module due to rust or the like can be delayed.

[0083] <14> the above <11> from <13> In the precast reinforced concrete module according to any one of the above aspects, a configuration characterized by including a plurality of the openings may be employed.

[0084] In addition, multiple openings are provided. In other words, multiple precast reinforced concrete modules are used to form a large precast reinforced concrete module. This reduces the amount of work required at the construction site, thereby improving the efficiency of construction work.

[0085] <15> The floor slab according to one aspect of the present disclosure is <11> from <14> The precast reinforced concrete module according to any one of the above aspects is arranged in a direction perpendicular to the axial direction.

[0086] Furthermore, the deck according to this embodiment is constructed by arranging multiple precast reinforced concrete modules with an opening ratio of 5% or more in a direction perpendicular to the axial direction of the cylindrical body. This allows sufficient sunlight to reach the area below the deck. Therefore, when the deck is used for a pier, for example, it can contribute to symbiosis with living organisms in the water area where the pier is installed.

[0087] <16> The floor slab according to one aspect of the present disclosure is <11> from <14> The precast reinforced concrete module according to any one of the above aspects is arranged in a direction perpendicular to the axial direction.

[0088] In addition, the perforated module is configured by arranging multiple precast reinforced concrete modules in a direction perpendicular to the axial direction of the cylindrical body, in which the distance from one end face to the reinforcing plate is different from the distance from the other end face to the reinforcing plate in the axial direction of the cylindrical body. This allows, for example, the reinforcing plate to be positioned above the center in the thickness direction of the perforated module. As a result, as described above, deterioration of the perforated module due to rust, etc. can be delayed. [Explanation of symbols]

[0089] 10-hole module 10a Module with second hole 10b Module with 3rd hole 10c Unit member with holes 10P opening 11 Cylindrical body 12 Reinforcement plate 12h through hole 13 Reinforcement bar placement section 13a Peripheral wall 13b Rib 13c Rebar arrangement surface 13d Engagement part 20 No-hole modules 20a 2nd No-Hole Module 20b 3rd holeless module 100 precast reinforced concrete modules Pier B BL reference position Cg, Cp concrete D1 Axial direction F floor slab N Fixing plate R rebar R2 Reinforcement bars Rb Bending section Rd diameter Rs male thread

Claims

1. A reinforced concrete structure having an opening, a cylindrical body that forms the opening; a reinforcing flat plate having a through hole through which the cylindrical body is inserted and arranged along a plane perpendicular to the axial direction of the cylindrical body; A reinforcing bar arrangement portion arranged on the outer circumferential side of the cylindrical body; Equipped with The reinforcing bar arrangement section is a plate-shaped peripheral wall extending from an outer peripheral edge of the reinforcing flat plate along the axial direction; a reinforcing bar arrangement surface formed by a plurality of reinforcing bars extending in a direction along the reinforcing plate and engaging with at least one of the peripheral wall and the reinforcing plate; A reinforced concrete structure comprising:

2. The reinforcing bar arrangement surface is arranged within the range in which the peripheral wall exists in the axial direction.

2. A reinforced concrete structure according to claim 1.

3. One reinforcing plate is provided for the cylindrical body.

2. A reinforced concrete structure according to claim 1.

4. The peripheral wall is provided in an annular shape along the outer circumferential edge of the reinforcing flat plate.

2. A reinforced concrete structure according to claim 1.

5. the peripheral wall includes a notch formed in a shape extending from an end portion in the axial direction to an interior portion in a surface direction, The plurality of reinforcing bars are engaged with the notches.

2. A reinforced concrete structure according to claim 1.

6. The peripheral wall has a through hole penetrating in a plate thickness direction, The plurality of reinforcing bars are engaged with the through holes.

2. A reinforced concrete structure according to claim 1.

7. The end of the reinforcing bar has a male thread portion, The reinforcing bar is fixed to at least one of the peripheral wall and the reinforcing flat plate by screwing a fixing plate into the male thread portion.

2. A reinforced concrete structure according to claim 1.

8. The reinforcing bar has a bent portion.

2. A reinforced concrete structure according to claim 1.

9. Further provided is a rib connecting the reinforcing plate and the peripheral wall.

2. A reinforced concrete structure according to claim 1.

10. In the axial direction, the end of the rib is located between the end of the peripheral wall and the rebar arrangement surface located adjacent to the end of the peripheral wall.

10. Reinforced concrete structure according to claim 9.

11. A precast reinforced concrete module comprising a reinforced concrete structure according to any one of claims 1 to 10, The opening ratio of the openings in the precast reinforced concrete module is 5% or more. Precast reinforced concrete module characterized by:

12. Each of the plurality of reinforcing bars is a single continuous reinforcing bar.

12. A precast reinforced concrete module according to claim 11.

13. In the axial direction, the distance from one end face to the reinforcing flat plate is different from the distance from the other end face to the reinforcing flat plate.

12. A precast reinforced concrete module according to claim 11.

14. A plurality of the openings are provided.

12. A precast reinforced concrete module according to claim 11.

15. The precast reinforced concrete module according to claim 11 is configured by arranging a plurality of modules in a direction perpendicular to the axial direction. A deck characterized by:

16. A plurality of precast reinforced concrete modules according to claim 13 are arranged in a direction perpendicular to the axial direction. A deck characterized by:

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