RC structure

Abstract

The problem is to make it possible to avoid the need to form a notch in the underside of the base or the like even when an axial force transmission plate such as a reinforcing plate is attached to the upper part of the anchor bolt. [Solution] An RC structure (1) comprises a main body (2) made of reinforced concrete, a solidified layer (10) deposited on the upper surface of the main body (2), anchor bolts (20) embedded in the main body (2) and penetrating the solidified layer (10) from the main body (2) and protruding above the solidified layer (10), and an axial force transmission plate (30) attached to the anchor bolts (20), embedded in the solidified layer (10), and placed on the upper surface of the main body (2). The upper surface of the axial force transmission plate (30) is below the surface of the solidified layer (10).

Description

[Technical Field]

[0001] The present invention relates to reinforced concrete structures. [Background technology]

[0002] Generally, anchor bolts are embedded in reinforced concrete foundations, protruding upward from the top surface of the foundation, and the building frame is fastened to the foundation by these anchor bolts. Such anchor bolts have an anchoring part such as an L-shaped hook, J-shaped hook, or anchor plate at their bottom end. The anchoring part transmits the upward tensile load of the building frame to the foundation, preventing the anchor bolt from being pulled out upward.

[0003] Patent Document 1 discloses a technology in which a reinforcing plate for connecting a building frame via anchor bolts is placed on the top surface of a foundation. Because the reinforcing plate protrudes from the top surface of the foundation, it is necessary to form a notch on the underside of the base of the building frame that is placed on top of the foundation, and to fit the reinforcing plate into the notch. Such a notch reduces the strength of the base. The notch also reduces the airtightness of the space below the building frame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-117892 Summary of the Invention [Problem to be solved by the invention]

[0005] The problem to be solved by the present invention is to eliminate the need to form a notch in the underside of the base or the like even when an axial force transmission plate such as a reinforcing plate is attached to the upper part of the anchor bolt. [Means for solving the problem]

[0006] The following reference numerals in parentheses refer to FIGS. 1 to 13.

[0007] In order to solve the above problems, according to claim 1, A reinforced concrete main body (2); a solidified layer (10) deposited on the upper surface of the body portion (2); an anchor bolt (20) embedded in the main body (2) and penetrating the solidified layer (10) from the main body (2) and protruding above the solidified layer (10); an axial force transmission plate (30) attached to the anchor bolt (20), embedded in the solidified layer (10), and placed on the upper surface of the main body portion (2); a nut (31) that is screwed onto the anchor bolt (20) on the axial force transmission plate (30) and fastens the axial force transmission plate (30) to the main body portion (2); Equipped with The upper surface of the axial force transmission plate (30) is located below the surface of the solidified layer (10), A recess (7) is formed on the upper surface of the main body (2), a portion of the solidified layer (10) is filled in the recess (7), the axial force transmission plate (30) and the nut (31) are entirely embedded in the solidified layer (10) within the recess (7), and the axial force transmission plate (30) is placed against the bottom of the recess (7). An RC structure (1) is provided.

[0008] According to claim 1 as described above, the axial force transmission plate (30) is embedded in the solidified layer (10), and the upper surface of the axial force transmission plate (30) is below the surface of the solidified layer (10). Therefore, even if a foundation (14) or the like is provided on the surface of the solidified layer (10), the axial force transmission plate (30) does not interfere with the foundation (14). There is no need to form a notch in the underside of the foundation (14) or the like to accommodate the axial force transmission plate (30). As a result, the strength of the foundation (14) or the like provided on the surface of the solidified layer (10) is maintained, and the airtightness of the space below the building frame constructed on the foundation (14) or the like is maintained.

[0010] The above claims 1 According to the above, the axial force transmission plate (30) and the nut (31) are entirely embedded in the solidified layer (10) within the recess (7), so that the axial force transmission plate (30) does not interfere with the base (14), etc., and it is not necessary to form a notch in the underside of the base (14), etc. to accommodate the axial force transmission plate (30). The axial force transmission plate (30) is placed against the bottom of the recess (7), and the nut (31) fastens the axial force transmission plate (30) to the main body (2), so that the downward compressive load of the building frame is transmitted to the reinforced concrete main body (2) through the anchor bolt (20), nut (31), and axial force transmission plate (30).

[0015] Claim 2 According to A reinforced concrete main body (2); a solidified layer (10) deposited on the upper surface of the body portion (2); an anchor bolt (20) embedded in the main body (2) and penetrating the solidified layer (10) from the main body (2) and protruding above the solidified layer (10); an axial force transmission plate (30) attached to the anchor bolt (20), embedded in the solidified layer (10), and placed on the upper surface of the main body portion (2); a nut (31) that is screwed onto the anchor bolt (20) on the axial force transmission plate (30) and fastens the axial force transmission plate (30) to the main body portion (2); Equipped with The upper surface of the axial force transmission plate (30) is located below the surface of the solidified layer (10), A base (14) is provided on the solidified layer (10), and the nut (31) and the anchor bolt (20) are passed through holes formed in the base (14); The nut (31) protrudes upward from the hole. R R A C structure (1) is provided. According to claim 3, there is provided an RC structure as described in claim 2, wherein the thickness of the solidified layer (10) is equal to the thickness of the axial force transmission plate (30), the upper surface of the axial force transmission plate (30) is exposed, and the surface of the solidified layer (10) is aligned with the height of the upper surface of the axial force transmission plate (30).

[0016] According to claims 2 and 3, the nut (31) is passed through the hole formed in the base (14), so the nut (31) does not interfere with the base (14). Therefore, it is not necessary to form a notch in the underside of the base (14) to accommodate the nut (31). The above claims 2,3 According to the above, since the nut (31) protrudes upward from the hole, the nut (31) can be turned from above the base (14), and the fastening force with which the nut (31) fastens the axial force transmission plate (30) to the main body part (2) can be adjusted. According to claims 2 and 3 described above, the axial force transmission plate (30) is placed on the upper surface of the main body (2) and the nut (31) fastens the axial force transmission plate (30) to the main body (2), so that the downward compressive load of the building frame is transmitted to the reinforced concrete main body (2) through the anchor bolt (20), the nut (31) and the axial force transmission plate (30). According to claim 3 as described above, the surface of the solidified layer (10) is aligned with the height of the upper surface of the axial force transmission plate (30), so that the axial force transmission plate (30) does not interfere with the base (14), etc., and there is no need to form a notch in the underside of the base (14), etc. to accommodate the axial force transmission plate (30).

[0017] Claim 4 According to A reinforced concrete main body (2); a solidified layer (10) deposited on the upper surface of the body portion (2); an anchor bolt (20) embedded in the main body (2) and penetrating the solidified layer (10) from the main body (2) and protruding above the solidified layer (10); an axial force transmission plate (30) attached to the anchor bolt (20), embedded in the solidified layer (10), and placed on the upper surface of the main body portion (2); a nut (31) that is integrated with the axial force transmission plate (30) and is screwed onto the anchor bolt (20) below the axial force transmission plate (30) to attach the axial force transmission plate (30) to the anchor bolt (20); and, Equipped with The upper surface of the axial force transmission plate (30) is located below the surface of the solidified layer (10), The nut (31) is embedded in the main body (2). An RC structure (1) according to claim 1 is provided.

[0018] The above claims 4 According to the above, since the nut (31) is embedded in the main body (2), the nut (31) does not interfere with the base (14), etc. Therefore, it is not necessary to form a notch in the underside of the base (14), etc., for accommodating the nut (31). The nut (31) is integrated with the axial force transmission plate (30), and the nut (31) is screwed onto the anchor bolt (20) below the axial force transmission plate (30), thereby attaching the axial force transmission plate (30) to the anchor bolt (20).The axial force transmission plate (30) is then placed on the upper surface of the main body (2), so that the downward compressive load of the building frame is transmitted to the reinforced concrete main body (2) through the anchor bolt (20) and the axial force transmission plate (30). Since the nut (31) is integrated with the axial force transmission plate (30), there is no need to tighten the axial force transmission plate (30) with the nut (31) or to manage the tightening.

[0019] Claim 5 According to The anchor bolt (20) a first anchor bolt (25) that forms the lower part of the anchor bolt (20) and is embedded in the main body (2); a second anchor bolt (26) that forms an upper portion of the anchor bolt (20) and protrudes above the solidified layer (10); and The upper end of the first anchor bolt (25) is screwed into the lower part of the nut (31), and the lower end of the second anchor bolt (26) is screwed into the upper part of the nut (31). Claim 4 The RC structure (1) described above is provided.

[0020] The above claims 5 According to this, the second anchor bolts 26 can be installed later. That is, the second anchor bolts 26 can be installed after the concrete of the main body 2 has hardened.

[0021] Claim 6 According to The solidified layer (10) is a hardened body of a self-leveling material, cement, or mortar. From claim 1 5 The RC structure (1) according to any one of the above is provided. [Effects of the Invention]

[0022] Since there is no need to form a notch on the underside of the foundation, etc. to accommodate the axial force transmission plate, the strength of the foundation, etc. placed on the surface of the solidified layer is maintained, and the airtightness of the space below the building structure constructed on the foundation, etc. is maintained. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a vertical cross-sectional view of the upper part of the RC structure of the first embodiment. [Figure 2] FIG. 2 is a perspective view showing the outer walls, beams, slabs and part of the rising portion of the RC structure of the first embodiment as viewed obliquely from above. [Figure 3] FIG. 3 is a vertical cross-sectional view of the upper part of the RC structure of a modified example of the first embodiment. [Figure 4] FIG. 4 is a vertical cross-sectional view showing a formwork used in constructing the RC structure of the first embodiment. [Figure 5] FIG. 5 is a vertical cross-sectional view showing a formwork used to construct a modified RC structure. [Figure 6] FIG. 6 is a vertical cross-sectional view showing a formwork and ready-mixed concrete held in it. [Figure 7]FIG. 7 is a vertical cross-sectional view showing the state after the top formwork has been removed. [Figure 8] FIG. 8 is a vertical cross-sectional view showing a state in which an axial force transmission plate and a nut are attached to an anchor bolt. [Figure 9] FIG. 9 is a vertical cross-sectional view showing the state in which the unhardened self-leveling material has been poured onto the rising portion. [Figure 10] FIG. 10 is a vertical cross-sectional view of the upper part of the RC structure of the second embodiment. [Figure 11] FIG. 11 is a vertical cross-sectional view of the upper part of the RC structure of the third embodiment. [Figure 12] FIG. 12 is a vertical cross-sectional view of the upper part of an RC structure according to a modified example of the third embodiment. [Figure 13] FIG. 13 is an exploded perspective view of the lower end of the anchor bolt. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments will be described with reference to the drawings. Features and technical effects of the embodiments will be understood from the following detailed description and drawings. However, the scope of the present invention is not limited to the embodiments disclosed below. Because the drawings are provided for illustrative purposes only, the scope of the present invention is not limited to the examples in the drawings.

[0025] First Embodiment <<1. RC structure>> FIG. 1 is a vertical cross-sectional view of the upper part of an RC (Reinforced Concrete) structure 1. As shown in FIG. The RC structure 1 is the skeleton of at least the first floor of a multi-story building. The RC structure 1 may constitute the basement in addition to the first floor of the building. The RC structure 1 may constitute the second or higher floor in addition to the first floor of the building. A wooden structure is constructed on top of the RC structure 1. The tensile and compressive loads of the wooden structure are transmitted to the RC main body 2 of the RC structure 1 by anchor bolts 20 of the RC structure 1. The tensile load refers to the load that pulls the wooden structure upward. The compressive load refers to the load that pushes the wooden structure downward. The wooden structure is a wall structure, a frame structure, or a combination of both. A wall structure refers to a structure in which the walls support the load of the wooden structure and its loads and seismic forces. A frame structure refers to a structure in which the columns, beams, and braces support the load of the wooden structure and its loads and seismic forces. The wooden frame may be constructed using panel construction, post and beam construction, post and beam panel construction, or frame wall construction, or a combination of two or more of these.

[0026] In the example shown in Figure 1, the RC structure 1 is a wall structure. However, the RC structure 1 may be modified in design to have a rigid frame structure.

[0027] The RC structure 1 has an RC main body 2 that includes a reinforced concrete exterior wall 3, a beam 4, a slab 5, and a rising portion 6. In addition to the RC main body 2, the RC structure 1 also includes a solidified layer 10, anchor bolts 20, an axial force transmission plate 30, and nuts 31.

[0028] The exterior wall 3 forms the outer periphery of the RC structure 1. The exterior wall 3 has single or double wall reinforcement and concrete, and the wall reinforcement is embedded in the concrete. The wall reinforcement has multiple vertical reinforcement and multiple horizontal reinforcement.

[0029] The beams 4 are constructed on the exterior walls 3. The upper ends of the exterior walls 3 are joined to the beams 4. The beams 4 extend circumferentially along the outer periphery of the RC structure 1. An opening may be formed in the exterior walls 3 below the beams 4. Because the RC structure 1 is a wall structure and the beams 4 are provided on the walls, the beams 4 are also called lateral beams or beam walls. The beams 4 support the wooden frame. The beams 4 have beam reinforcement and concrete, and the beam reinforcement is embedded in the concrete. The beam reinforcement has multiple main reinforcement bars 4a and multiple shear reinforcement bars 4b.

[0030] A slab 5 is constructed inside the beam 4. The slab 5 extends horizontally, and the edges of the slab 5 are connected to the beam 4. The slab 5 has single or double slab reinforcement having multiple main reinforcements and multiple distribution reinforcements, and concrete, and the slab reinforcement is embedded in the concrete.

[0031] The upper part of the beam 4 protrudes upward from the top surface of the slab 5, forming the rising part 6. The rising part 6 has rising reinforcement and concrete, and the rising reinforcement is embedded in the concrete. The rising reinforcement has multiple main reinforcement and multiple shear reinforcement. However, if the height of the rising part 6 is low, the beam reinforcement may extend to the concrete of the rising part 6 and be embedded in the concrete instead of the rising reinforcement. It is also possible that the upper part of the beam 4 does not protrude from the top surface of the slab 5.

[0032] A rectangular recess 7 is formed on the upper surface of the rising portion 6. The bottom of the recess 7 is a horizontal plane. In FIG. 2, the outer wall 3, beam 4, slab 5, and part of the rising portion 6 are shown as seen obliquely from above to help understand the shape of the recess 7. In FIG. 2, the dotted line represents the solidified layer 10.

[0033] 1 and 2, the recess 7 extends to the inner surface of the rising portion 6. In contrast, as shown in FIG. 3, the recess 7 may be entirely surrounded by the concrete of the rising portion 6.

[0034] The solidified layer 10 is deposited on the raised portion 6. A portion of the solidified layer 10 fills the recess 7 of the raised portion 6. The upper surface of the solidified layer 10 is a horizontal plane, and the upper surface of the solidified layer 10 is not recessed even above the recess 7. The solidified layer 10 is a hardened body of a self-leveling material, cement, or mortar.

[0035] The anchor bolt 20 is embedded vertically in the concrete of the beam 4 and the rising portion 6 below the recess 7. The anchor bolt 20 protrudes upward from the concrete of the rising portion 6, and then penetrates the solidified layer 10 to protrude upward from the solidified layer 10.

[0036] An anchoring portion 21 is provided at the lower end of the anchor bolt 20. The anchoring portion 21 is an anchoring plate, and the anchor bolt 20 passes through the anchoring portion 21, and upper and lower nuts 22, 23 are screwed onto the anchor bolt 20 with the anchoring portion 21 in between, thereby fixing the anchor bolt 20 to the lower end of the anchor bolt 20. The anchoring portion 21 fixes the anchor bolt 20 to the concrete of the beam 4. The upward tensile load of the anchor bolt 20 is transmitted to the beam 4 by the anchoring portion 21, preventing the anchor bolt 20 from being pulled out.

[0037] As long as the size of the fixing portion 21 in the direction perpendicular to the axial direction of the anchor bolt 20 is larger than the diameter of the anchor bolt 20, the fixing portion 21 is not limited to a fixing plate. For example, a nut, a cap-shaped flange, a J-shaped hook, an L-shaped hook, or the like may be used as the fixing portion 21 instead of a fixing plate. The fixing portion 21 may be formed integrally with the anchor bolt 20, or may be assembled to the anchor bolt 20.

[0038] The entire axial force transmission plate 30 is embedded in the solidified layer 10 within the recess 7, and the upper surface of the axial force transmission plate 30 is located below the surface of the solidified layer 10. The axial force transmission plate 30 is in surface contact with the bottom of the recess 7. The anchor bolt 20 penetrates the axial force transmission plate 30.

[0039] The entire nut 31 is embedded in the solidified layer 10 within the recess 7, and the top surface of the nut 31 is located below the surface of the solidified layer 10. The nut 31 is screwed onto the anchor bolt 20 to tighten the axial force transmission plate 30 to the rising portion 6.

[0040] An undercarriage 12, such as a ventilation undercarriage, is installed on the solidified layer 10, and a base 14 of a wooden structure is installed on the undercarriage 12. Columns and / or walls of the wooden structure are installed on the base 14. Anchor bolts 20 pass through the undercarriage 12 and the base 14 and protrude upward from the top surface of the base 14. The anchor bolts 20 are connected to columns of the wooden structure. The anchor bolts 20 may be connected to walls of the wooden structure instead of columns. Because the axial force transmission plates 30 and nuts 31 are embedded in the solidified layer 10, the undercarriage 12 does not need to be installed away from the anchor bolts 20. Furthermore, it is not necessary to provide recesses on the underside of the base 14 to accommodate the axial force transmission plates 30 and nuts 31.

[0041] Alternatively, the base 14 may be provided directly on the solidified layer 10 without providing the base 12 .

[0042] <<2. Construction method of reinforced concrete structure>> As shown in Figure 4, after single or double wall reinforcement is arranged, a pair of wall side formworks 71, 72 are erected parallel to each other on both sides of the wall reinforcement. The wall side formwork 71 is used to hold back concrete on the indoor side of the exterior wall 3. The wall side formwork 72 is used to hold back concrete on the outdoor side of the exterior wall 3. The wall side formwork 72 is higher than the wall side formwork 71, and the upper end of the wall side formwork 72 is located above the upper end of the wall side formwork 71. The wall side formwork 72 is used to hold back not only the concrete of the exterior wall 3, but also the concrete of the beams 4 and rising portions 6. In other words, the upper part of the wall side formwork 72 serves as the side formwork for the beams 4 and rising portions 6. A horizontal square bar 77 is fixed to the inner surface of the upper part of the wall side formwork 72. The square bar 77 is not necessary.

[0043] Next, the bottom formwork 73 is assembled horizontally on the upper end of the wall side formwork 71, and the side formwork 74 is erected on the edge of the bottom formwork 73 parallel to the wall side formwork 72. When assembling the bottom formwork 73, the bottom formwork 73 is extended from the upper end of the wall side formwork 71 in the direction opposite the wall side formwork 72. When assembling the side formwork 74, the distance between the side formwork 74 and the wall side formwork 72 is made wider than the distance between the wall side formwork 71 and the wall side formwork 72. The bottom formwork 73 and the side formwork 74 are used to hold back the concrete of the beam 4. The bottom formwork 73 and the side formwork 74 may be supported by shoring.

[0044] Before or after the set of wall side formworks 71, 72, bottom formwork 73 and side formwork 74, or in parallel with these sets, shoring is installed on the indoor side of wall side formwork 71, and slab formwork 75 is laid horizontally on top of the upper end of the shoring.

[0045] Next, beam reinforcement is arranged in the area surrounded by the wall side formwork 72, bottom formwork 73, and side formwork 74, and rising reinforcement is arranged on top of the beam reinforcement. Furthermore, single or double slab reinforcement is arranged on top of the slab formwork 75. At this time, the slab reinforcement is extended to the area surrounded by the wall side formwork 72, bottom formwork 73, and side formwork 74, and if necessary, the slab reinforcement is bent to extend to the area between the wall side formworks 71 and 72.

[0046] Next, a floating formwork 76 is placed parallel to the wall side formwork 72 at a position above and spaced apart from the side formwork 74. At this time, the floating formwork 76 is supported by supports on the wall side formwork 72, or supports are placed between the floating formwork 76 and the slab formwork 75 and the floating formwork 76 is supported by the supports.

[0047] Next, the rectangular panel-shaped top formwork 78 is moved upward away from the bottom formwork 73 and placed parallel to the bottom formwork 73. At this time, one side of the top formwork 78 is placed against the floating formwork 76, and the other side is moved away from the wall side formwork 72 and square bar 77.

[0048] The top formwork 78 has a rectangular upper panel 78b, a rectangular lower panel 78a, and a rectangular frame body 78c. The upper panel 78b is attached to the top surface of the frame body 78c, and the lower panel 78a is attached to the bottom surface of the frame body 78c. The frame body 78c is provided in a rectangular frame shape along the outer edge of the lower panel 78a. The upper panel 78b protrudes from the edge of the frame body 78c, and the protruding portion is fastened onto the floating formwork 76 and the square bars 77. Therefore, the top formwork 78 is supported on the floating formwork 76 and the square bars 77. The top formwork 78 may be supported by the wall side formwork 72 via supports.

[0049] 5, the lower surface material 78a and frame body 78c of the top formwork 78 may be separated from the floating formwork 76. The width of the lower surface material 78a and frame body 78c shown in FIG. 5 is smaller than the width of the lower surface material 78a and frame body 78c shown in FIG.

[0050] A hole is formed in the top formwork 78 so as to pass through the top formwork 78 from top to bottom. The anchor bolt 20 is passed through the hole in the top formwork 78, and the anchor bolt 20 is positioned vertically between the wall side formwork 72 and the side formwork 74. The anchor bolt 20 may be supported by the top formwork 78. The anchor bolt 20 may be supported by a jig or the like on the wall formwork 72, the floating formwork 76, or both.

[0051] Before or after installing the anchor bolt 20, the fixing portion 21 is fixed to the lower end of the anchor bolt 20 with nuts 22 and 23. If the fixing portion 21 is integrated with the anchor bolt 20, the work of fixing the fixing portion 21 to the anchor bolt 20 is not necessary.

[0052] After the above-described formwork assembly and reinforcement processes, fresh concrete 80 is poured as shown in FIG. 6. Specifically, fresh concrete 80 is poured between the wall side formwork 71 and the wall side formwork 72, and the wall reinforcement is embedded in the fresh concrete 80. Fresh concrete 80 is poured into the area surrounded by the wall side formwork 72, the bottom formwork 73, and the side formwork 74, and the anchor bolts 20 and the lower parts of the beam reinforcement are embedded in the fresh concrete 80. Fresh concrete 80 is poured onto the slab formwork 75 up to the level of the lower end of the floating formwork 76, and the anchor bolts 20, the upper parts of the beam reinforcement, the lower parts of the rising reinforcement, and the slab reinforcement are embedded in the fresh concrete 80. Fresh concrete 80 is poured up to the level of the upper ends of the floating formwork 76 and square bars 77 and the lower surface of the upper face material 78b, and the upper parts of the rising reinforcement, the lower parts of the anchor bolts 20, the lower face material 78a, and the frame body 78c are embedded in the fresh concrete 80. However, if the frame body 78c of the top formwork 78 is thick, as long as the surface of the fresh concrete 80 reaches the level of the frame body 78c, it does not have to reach the level of the upper ends of the floating formwork 76 and square bars 77 and the lower surface of the upper surface material 78b. During or after pouring the ready-mixed concrete 80, the ready-mixed concrete 80 is compacted as necessary to make the ready-mixed concrete 80 dense.

[0053] Thereafter, the ready-mixed concrete 80 is cured to harden the ready-mixed concrete 80.

[0054] 7, the top formwork 78 is then removed, thereby exposing the recess 7 formed on the upper surface of the rising portion 6.

[0055] Next, as shown in FIG. 8 , anchor bolts 20 are passed through the holes in the axial force transmission plate 30, and the axial force transmission plate 30 is lowered to the bottom of the recess 7. Nuts 31 are then screwed onto the anchor bolts 20, and the axial force transmission plate 30 is fastened to the bottom of the recess 7 by the nuts 31. Furthermore, a retaining material 79 such as a square bar or formwork is placed on top of the floating formwork 76, and the inner side of the retaining material 79 is aligned with the inner side of the floating formwork 76. Note that if the frame body 78c of the top formwork 78 is thick and the surface of the previously poured fresh concrete 80 does not reach the same level as the upper ends of the floating formwork 76 and the square bars 77 and the lower surface of the upper face material 78b, the retaining material 79 does not need to be placed.

[0056] Next, as shown in Figure 9, unhardened self-leveling material 81 is poured onto the rising portion 6. The self-leveling material 81 is poured into the recess 7, and the axial force transmission plate 30 and the nut 31 are embedded in the self-leveling material 81. At this time, the self-leveling material 81 is poured until the surface of the self-leveling material 81 reaches a position higher than the upper end of the nut 31. Due to the self-leveling property of the self-leveling material 81, the surface of the self-leveling material 81 becomes horizontal.

[0057] Instead of the self-leveling material 81, unhardened cement or mortar may be poured onto the rising portion 6, and the axial force transmission plate 30 and the nut 31 in the recess 7 may be buried in the cement or mortar.

[0058] When the self-leveling material 81, cement, or mortar hardens, a solidified layer 10 is formed. After that, a demolding process is performed. That is, the formwork 71 to 76 and the damming material 79 are dismantled to expose the surface of the concrete and the solidified layer 10.

[0059] <<3. Technically advantageous effects>> (1) Because the entire axial force transmission plate 30 and the nut 31 are embedded in the solidified layer 10 within the recess 7, the upper surfaces of the axial force transmission plate 30 and the nut 31 are located below the surface of the solidified layer 10. Even if the base 12 and the base 14 are provided on the surface of the solidified layer 10, the axial force transmission plate 30 and the nut 31 do not interfere with the base 12 and the base 14. Therefore, the base 12 does not end above the axial force transmission plate 30, and it is not necessary to form notches in the underside of the base 14 to accommodate the axial force transmission plate 30 and the nut 31. This maintains the strength of the base 14 and also keeps the space below the wooden frame constructed on the base 14 airtight.

[0060] (2) The axial force transmission plate 30 is placed against the bottom of the recess 7, and the nut 31 fastens the axial force transmission plate 30 to the rising portion 6 of the RC main body 2, so that the downward compressive load of the wooden structure is transmitted to the rising portion 6 through the anchor bolt 20, the nut 31, and the axial force transmission plate 30.

[0061] (3) Because the anchor bolts 20 are installed in the RC structure 1, a wooden frame can be constructed on top of the RC structure 1. The energy used from the production to the disposal and disposal of wood is less than the energy used from the production to the disposal and disposal of metal materials or concrete materials. Therefore, this RC structure 1 contributes to the realization of a decarbonized society by promoting carbon neutrality, which reduces carbon dioxide emissions to virtually zero, and to the achievement of the Sustainable Development Goals (SDGs).

[0062] Second Embodiment In the first embodiment, as shown in FIG. 1, a recess 7 is formed on the upper surface of the rising portion 6, and an axial force transmission plate 30 and a nut 31 are embedded in the solidified layer 10 within the recess 7.

[0063] In contrast, in the second embodiment, as shown in FIG. 10 , the recess 7 is not formed on the upper surface of the rising portion 6, the axial force transmission plate 30 is embedded in the solidified layer 10, and the nut 31 is not embedded in the solidified layer 10 but fastens the axial force transmission plate 30 to the concrete of the rising portion 6. The thickness of the solidified layer 10 is equal to the thickness of the axial force transmission plate 30, the upper surface of the axial force transmission plate 30 is exposed, and the surface of the solidified layer 10 is aligned with the height of the upper surface of the axial force transmission plate 30. In other words, the surface of the solidified layer 10 is flush with the upper surface of the axial force transmission plate 30. Therefore, the axial force transmission plate 30 does not interfere with the abutment 12 and the base 14. Therefore, the abutment 12 does not end above the axial force transmission plate 30, and it is not necessary to form a notch in the underside of the base 14 to accommodate the axial force transmission plate 30.

[0064] The nut 31 is a high nut. The diameter of the holes formed in the base 12 and the base 14 is larger than that in the first embodiment, and not only the anchor bolt 20 but also the nut 31 is passed through the holes in the base 12 and the base 14. Therefore, the nut 31 does not interfere with the base 12 and the base 14. Therefore, it is not necessary to form a notch in the underside of the base 14 to accommodate the nut 31.

[0065] If the nut 31 protrudes upward from the hole in the base 14, the nut 31 can be turned from above the base 14. Therefore, the tightening of the nut 31 can be easily adjusted even after the base wheel 12 and the base 14 have been installed.

[0066] In the second embodiment, since the recess 7 is not formed in the rising portion 6, concrete 80 is poured without using a top formwork 78 when constructing the RC structure. Furthermore, the self-leveling material 81, cement, or mortar is poured until the surface of the self-leveling material 81, cement, or mortar reaches the upper surface of the axial force transmission plate 30. In other respects, the construction method of the RC structure of the second embodiment is the same as the construction method of the RC structure 1 of the first embodiment. Note that the step of screwing the nut 31 onto the anchor bolt 20 may be performed after the self-leveling material 81, cement, or mortar has hardened. For example, the step of screwing the nut 31 onto the anchor bolt 20 may be performed after the base 12 and the foundation 14 have been installed.

[0067] <Third embodiment> 1, a recess 7 is formed on the upper surface of the rising portion 6, and an axial force transmission plate 30 and a nut 31 are embedded in the solidified layer 10 within the recess 7. Furthermore, the axial force transmission plate 30 and the nut 31 are separate bodies, and the axial force transmission plate 30 and the nut 31 are assembled to the anchor bolt 20.

[0068] 11, the recess 7 is not formed on the upper surface of the rising portion 6, the nut 31 and the axial force transmission plate 30 are previously integrated by welding or the like, the nut 31 is embedded in the concrete of the rising portion 6, and the axial force transmission plate 30 is embedded in the solidified layer 10. Therefore, the base 12 does not have to be interrupted above the axial force transmission plate 30, and notches for accommodating the nut 31 and the axial force transmission plate 30 do not have to be formed on the underside of the base 14.

[0069] The thickness of the solidified layer 10 is equal to the thickness of the axial force transmission plate 30, the upper surface of the axial force transmission plate 30 is exposed, and the surface of the solidified layer 10 is aligned with the height of the upper surface of the axial force transmission plate 30. In other words, the surface of the solidified layer 10 is flush with the upper surface of the axial force transmission plate 30. However, the solidified layer 10 may be thicker than the axial force transmission plate 30, and the upper surface of the axial force transmission plate 30 may not be exposed, so that the upper surface of the axial force transmission plate 30 is located below the surface of the solidified layer 10.

[0070] Since the nut 31 and the axial force transmission plate 30 are integrated in advance, there is no need to adjust the tightening of the nut 31 after concrete is poured.

[0071] In the third embodiment, the recess 7 is not formed in the rising portion 6, so when constructing the RC structure, the nuts 31 are screwed onto the anchor bolts 20 to adjust the position of the axial force transmission plate 30 before pouring the concrete 80. Furthermore, without using the top formwork 78, the concrete 80 is poured until the surface of the concrete 80 reaches the underside of the axial force transmission plate 30. In all other respects, the construction method of the RC structure of the third embodiment is the same as the construction method of the RC structure 1 of the first embodiment.

[0072] In the third embodiment, the nut 31 may be a high nut as shown in Fig. 12. When a high nut is used for the nut 31, the anchor bolt 20 may have an embedded anchor bolt 25 and a post-installation anchor bolt 26. The embedded anchor bolt 25 is embedded in the rising portion 6 and the concrete of the beam 4. The upper end of the embedded anchor bolt 25 is screwed into the lower part of the nut 31. The post-installation anchor bolt 26 protrudes upward from the rising portion 6 and the solidified layer 10. The lower end of the post-installation anchor bolt 26 is screwed into the upper part of the nut 31.

[0073] The embedded anchor bolt 25 is set together with the axial force transmission plate 30 and the nut 31 before pouring the ready-mixed concrete 80. The post-installed anchor bolt 26 is screwed into the nut 31 after the concrete has hardened. The post-installed anchor bolt 26 may be screwed after pouring the self-leveling material 81, cement, or mortar, after installing the base 12, or after installing the foundation 14, as long as it is after the concrete has hardened.

[0074] <Modification> (1) The RC main body of the RC structure may be a foundation such as a strip footing or a mat footing. In this case, anchor bolts are embedded in the rising portion of the foundation, a solidified layer is formed on the rising portion, and the anchor bolts protrude upward from the rising portion and the solidified layer. As in the first embodiment, the axial force transmission plate and nut may be embedded in the solidified layer in a recess formed on the upper surface of the rising portion. As in the second embodiment, the axial force transmission plate may be embedded in the solidified layer, and the nut may be fastened to the concrete of the rising portion without being embedded in the solidified layer. As in the third embodiment, the nut and axial force transmission plate may be integrated in advance, and the nut may be embedded in the concrete of the rising portion, and the axial force transmission plate may be embedded in the solidified layer.

[0075] (2) In each of the above embodiments, the anchor bolts 20, nuts 31, and axial force transmission plates 30 on the outer wall 3 are illustrated. The nuts and axial force transmission plates provided on the anchor bolts on the inner wall of the RC structure 1 may also be installed in the same manner as the nuts 31 and axial force transmission plates 30 shown in Figures 1, 3, 10, 11, and 12.

[0076] (3) In each of the above embodiments, two anchor bolts 20 are arranged in the thickness direction of the exterior wall 3, but a single anchor bolt 20 may be arranged. Four anchor bolts may be arranged in a grid pattern on an external corner of the RC structure 1, that is, on an external corner where two exterior walls 3 are joined in an L-shape. Four anchor bolts may be arranged in a grid pattern on a portion where an exterior wall 3 of the RC structure 1 is joined to an interior wall in a T-shape. Four anchor bolts may be arranged in a grid pattern on a portion where two interior walls of the RC structure 1 are joined in a T-shape or cross-shape. The nuts and axial force transmission plates provided on any of the anchor bolts may be installed in the same manner as the nuts 31 and axial force transmission plates 30 shown in Figures 1, 3, 10, 11, and 12.

[0077] (4) In each of the above embodiments, the anchor bolt 20 penetrates the fixing portion (fixing plate) 21, and the upper and lower nuts 22, 23 are screwed onto the anchor bolt 20 with the fixing portion 21 sandwiched therebetween, thereby fixing the fixing portion 21 to the lower end of the anchor bolt 20. Alternatively, as shown in FIG. 13 , a female thread 21b may be formed in the center of the fixing portion 21, and the anchor bolt 20 may be screwed into the female thread 21b of the fixing portion 21. In this case, even if the upper nut 22 is not provided, the nut 23 and the fixing portion 21 are fastened to each other, preventing loosening of the nut 22 and the fixing portion 21. Note that neither the upper nut 22 nor the lower nut 23 may be provided. The fixing portion 21 may be formed in a disk shape, and a plurality of rectangular notches 21a may be formed at equal intervals on the outer periphery of the fixing portion 21. The concrete of the beam 4 is caught in the notch 21a, thereby preventing the fixing portion 21 from rotating, and therefore preventing the anchor bolt 20 and the fixing portion 21 from rotating together.

[0078] (5) The axial force transmission plate 30 may be the same as the fixing portion 21 shown in Fig. 13. Therefore, the axial force transmission plate 30 is formed in a disk shape, with multiple rectangular notches formed on the outer periphery of the axial force transmission plate 30, with a female thread formed in the center of the axial force transmission plate 30, and the anchor bolt 20 being screwed into the female thread of the axial force transmission plate 30. In this case, the nut 31 does not need to be provided.

[0079] <Summary> The above-disclosed embodiments have been made for the purposes of illustration and example only, and are not intended to limit the scope of the present invention, which should be interpreted by the terms of the claims. [Explanation of symbols]

[0080] 1 RC structure 2 RC main body 6. Rising section 7 recess 20 anchor bolts 30 Axial force transmission plate 31 Nut

Claims

1. A main body made of reinforced concrete; a solidified layer deposited on an upper surface of the body portion; an anchor bolt embedded in the main body portion, penetrating the solidified layer from the main body portion and protruding above the solidified layer; an axial force transmission plate attached to the anchor bolt, embedded in the solidified layer, and in contact with an upper surface of the main body; a nut that is screwed onto the anchor bolt on the axial force transmission plate and fastens the axial force transmission plate to the main body; Equipped with the upper surface of the axial force transmission plate is below the surface of the solidified layer; A recess is formed on the upper surface of the main body, a portion of the solidified layer is filled in the recess, the axial force transmission plate and the nut are entirely embedded in the solidified layer within the recess, and the axial force transmission plate is placed against the bottom of the recess. RC structure.

2. The main body is made of reinforced concrete, a solidified layer deposited on an upper surface of the body portion; an anchor bolt embedded in the main body portion, penetrating the solidified layer from the main body portion and protruding above the solidified layer; an axial force transmission plate attached to the anchor bolt, embedded in the solidified layer, and in contact with an upper surface of the main body; a nut that is screwed onto the anchor bolt on the axial force transmission plate and fastens the axial force transmission plate to the main body; Equipped with the upper surface of the axial force transmission plate is below the surface of the solidified layer; a base is provided on the solidified layer, and the nut and the anchor bolt are passed through a hole formed in the base; The nut protrudes upward from the hole. RC structure.

3. The thickness of the solidified layer is equal to the thickness of the axial force transmission plate, the upper surface of the axial force transmission plate is exposed, and the surface of the solidified layer is aligned with the height of the upper surface of the axial force transmission plate.

3. The RC structure of claim 2.

4. A main body made of reinforced concrete; a solidified layer deposited on an upper surface of the body portion; an anchor bolt embedded in the main body portion, penetrating the solidified layer from the main body portion and protruding above the solidified layer; an axial force transmission plate attached to the anchor bolt, embedded in the solidified layer, and in contact with an upper surface of the main body; a nut that is integrated with the axial force transmission plate and is screwed onto the anchor bolt below the axial force transmission plate to attach the axial force transmission plate to the anchor bolt; Equipped with the upper surface of the axial force transmission plate is below the surface of the solidified layer; The nut is embedded in the body portion. RC structure.

5. The anchor bolt is a first anchor bolt that forms a lower portion of the anchor bolt and is embedded in the main body portion; a second anchor bolt that forms an upper portion of the anchor bolt and protrudes above the solidified layer; and The upper end of the first anchor bolt is screwed into the lower part of the nut, and the lower end of the second anchor bolt is screwed into the upper part of the nut.

5. The RC structure of claim 4.

6. The solidified layer is a hardened body of a self-leveling material, cement, or mortar.

6. An RC structure according to any one of claims 1 to 5.

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