Reinforced concrete formwork assembly, construction method, assembly method, and reinforced concrete structure
The reinforced concrete formwork assembly with a supported third side formwork and bridging member stabilizes floating formworks, preventing collapse and eliminating visible joints, thus improving construction efficiency and aesthetics.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- MISAWA HOMES CO LTD
- Filing Date
- 2024-03-21
- Publication Date
- 2026-07-03
AI Technical Summary
Existing techniques face challenges in firmly supporting floating formworks during the construction of rising parts in reinforced concrete structures, leading to potential collapse and the need for additional joint treatments.
A reinforced concrete formwork assembly is designed with a third side formwork supported by a bridging member and anchor, which is attached to reinforcing bar assemblies, ensuring stable support and eliminating the need for construction joints.
The solution provides stable support for floating formworks, preventing collapse and eliminating visible joints, thereby enhancing construction efficiency and aesthetic quality.
Smart Images
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Abstract
Description
Technical Field
[0001] The present invention relates to a reinforcing bar formwork assembly, a construction method, an assembly method, and a reinforced concrete structure.
Background Art
[0002] Patent Documents 1 and 2 disclose a technique for forming a concrete rising part on a beam using a floating formwork. Patent Document 3 discloses a technique for damming fresh concrete when casting fresh concrete in a base and a rising part, and embedding the lower part of an anchor bolt erected by a support in the fresh concrete using a floating formwork. Patent Document 4 discloses a technique in which, in order, a formwork carpenter assembles and forms a slab formwork, a steel bar worker arranges slab steel bars and setup steel bars, a formwork worker assembles and forms a floating formwork for a rising part supported by an end beam receiver, and an earthwork worker casts fresh concrete into the slab formwork and the floating formwork.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Patent Document 2
Patent Document 3
Patent Document 4
Summary of the Invention
Problems to be Solved by the Invention
[0004] An object of the present invention is to be able to firmly support a floating formwork for damming fresh concrete in a rising part.
Means for Solving the Problems
[0005] The reference numerals in parentheses below are referenced in Figures 1 to 7.
[0006] To solve the above problems, according to claim 1, A reinforced concrete formwork assembly, First side formwork (56) for beam (50) and rising section (70), A second side formwork (57) for a beam (50) is erected parallel to the first side formwork (56) and has an upper end lower than the upper end of the first side formwork (56), A bottom formwork (55) for a beam (50) is provided between the first side formwork (56) and the second side formwork (57), A slab formwork (65) extends from the upper end of the second side formwork (57) toward the opposite side of the first side formwork (56), A support (76) erected on the upper end of the second side formwork (57) or on the slab formwork (65), A third side formwork (77) for the rising section (70) is erected on the support (76) parallel to the first side formwork (56), A bridging member (78) is installed between the first side formwork (56) and the third side formwork (77), Reinforcement assemblies (51 and 52) for a beam (50) are arranged in the area enclosed by the first side formwork (56), the second side formwork (57), and the bottom formwork (55), An anchor (80) is assembled in the aforementioned region to the reinforcing bar assemblies (51 and 52), extends upward from the reinforcing bar assemblies (51 and 52), and is assembled to the bridging member (78), Equipped with 、 The third side formwork (77) is positioned directly above the upper end of the second side formwork (57), The support member (76) is erected upright on the upper end of the second side formwork (57) or on the slab formwork (65). A reinforced concrete formwork assembly with the following characteristics is provided.
[0007] According to claim 1 as described above, since the third side formwork (77) is erected on the support (76), the third side formwork (77) is a floating formwork. Since the bridging member (78) is installed between the first side formwork (56) and the third side formwork (77), the third side formwork (77) is firmly supported by the first side formwork (56), and the distance between the third side formwork (77) and the first side formwork (56) is maintained. Since the anchor (80) is attached to the reinforcing bar assemblies (51 and 52) and the bridging member (78), the bridging member (78) is firmly supported by the reinforcing bar assemblies (51 and 52), and the third side formwork (77) is firmly supported by the reinforcing bar assemblies (51 and 52) through the bridging member (78) and the anchor (80). Because the anchor (80) not only performs its primary function but also supports the third formwork (77), the anchor (80) contributes to reducing the amount of materials used and improving construction work efficiency. 。 Claim 2 According to this, a reinforced concrete formwork assembly according to claim 1 is provided, characterized in that the reinforced concrete assembly (51 and 52) protrudes above the slab formwork (65) from between the first side formwork (56) and the second side formwork (57).
[0008] Claim 3 According to Claim 1 The reinforced concrete formwork assembly described above, It comprises a first formwork (46) and a second formwork (47) for the exterior wall, which are erected parallel to each other. The first side formwork (56) is provided on the upper end of the first formwork (46) so as to extend upward from the upper end of the first formwork (46), The bottom formwork (55) extends from the upper end of the second formwork (47) toward the opposite side of the first formwork (46), The second side formwork (57) is erected parallel to the first side formwork (56) at the edge of the bottom formwork (55) opposite to the first side formwork (46). A reinforced concrete formwork assembly with the following characteristics is provided.
[0009] Claim4 According to claim 1 A method for constructing a reinforced concrete structure (10) using the reinforced formwork assembly described in By pouring concrete (110) onto the slab formwork (65) up to the lower end of the third side formwork (77), the support tool (76) is embedded in the concrete (110). By pouring concrete (110) into the region up to above the lower end of the third side formwork (77), the lower part of the anchor (80) and the reinforcement assembly (51 and 52) are embedded in the concrete (110). A construction method characterized by the above is provided.
[0010] As described in the above claim 4 According to, by pouring concrete (110) onto the slab formwork (65) up to the lower end of the third side formwork (77), the slab (60) is formed and the support tool (76) is buried in the slab (60). By pouring concrete (110) into the region surrounded by the first side formwork (56), the second side formwork (57) and the bottom formwork (55) up to above the lower end of the third side formwork (77), the beam (50) and the rising part (70) are formed without being patched, and the lower part of the anchor (80) is buried in the beam (50) and the rising part (70). Since the third side formwork (77) is firmly supported, the third side formwork (77) does not collapse or shift during the pouring of concrete (110). Since the beam (50) and the rising part (70) are formed without being patched, a cold joint does not occur at the boundary between the beam (50) and the rising part (70). The work of creating a joint and waterproof treatment are not required, and the subsequent joint maintenance work is also not required. On the surface of the beam (50) and the rising part (70), the joint between the beam (50) and the rising part (70) does not appear, and the design of the reinforced concrete structure (10) is highly aesthetic.
[0011] claim 5 According to claim 3A method for constructing a reinforced concrete structure (10) using the reinforced formwork assembly described in Concrete (110) is poured between the first formwork (46) and the second formwork (47), By pouring concrete (110) onto the slab formwork (65) up to the lower end of the third side formwork (77), the support tool (76) is embedded in the concrete (110), By pouring concrete (110) into the area up to the upper part of the lower end of the third side formwork (77), the lower part of the anchor (80) and the reinforcement assembly (51 and 52) are embedded in the concrete (110) A construction method characterized by the above is provided.
[0012] In the above claims 5 According to, by pouring concrete (110) between the first formwork (46) and the second formwork (47), a wall (40) is formed. By pouring concrete (110) onto the slab formwork (65) up to the lower end of the third side formwork (77), a slab (60) is formed and the support tool (76) is embedded in the slab (60). By pouring concrete (110) into the area surrounded by the first side formwork (56), the second side formwork (57) and the bottom formwork (55) up to the upper part of the lower end of the third side formwork (77), the beam (50) and the rising part (70) are formed without being spliced, and the lower part of the anchor (80) is embedded in the beam (50) and the rising part (70). Since the third side formwork (77) is firmly supported, the third side formwork (77) does not collapse or shift during the pouring of concrete (110). Since the beam (50) and the rising part (70) are formed without being spliced, a cold joint does not occur at the boundary between the beam (50) and the rising part (70). The work of creating a joint and waterproofing treatment are not required, and the maintenance work of the joint in the future is not required. On the surface of the beam (50) and the rising part (70), the joint between the beam (50) and the rising part (70) does not appear, and the design of the reinforced concrete structure (10) is highly improved.
[0013] Claim 6 According to the claim, 4 The construction method described above, The level of the concrete (110) poured into the aforementioned area is higher than the level of the concrete (110) poured onto the slab formwork (65), and lower than the level of the bridging material (78). A construction method characterized by the above is provided.
[0014] The above Claim 6 According to the findings, the bridging material (78) is not embedded in the concrete (110), resulting in good performance for the beam (50) and the rising section (70).
[0015] Claim 7 According to Claim 1 A method for assembling the described reinforced concrete formwork assembly, The bottom formwork (55) is laid, the first side formwork (56) and the second side formwork (57) are erected parallel to each other on both sides of the bottom formwork (55), the slab formwork (65) is assembled to the upper end of the second side formwork (57), and the slab formwork (65) is extended from the upper end of the second side formwork (57) toward the opposite side of the first side formwork (56), The support member (76) is erected on the upper end of the second side formwork (57) or on the slab formwork (65). The reinforcing bar assemblies (51 and 52) are placed in the area enclosed by the first side formwork (56), the second side formwork (57), and the bottom formwork (55). The third side formwork (77) is erected on the support (76) parallel to the first side formwork (56), The bridging member (78) is erected between the first side formwork (56) and the third side formwork (77), In the aforementioned region, the anchor (80) is assembled to the reinforcing bar assembly (51 and 52), and the anchor (80) is extended upward from the reinforcing bar assembly (51 and 52) to be assembled to the bridging member (78). An assembly method characterized by the above is provided.
[0016] Claim 8 According to Claim 3 A method for assembling the reinforced concrete formwork assembly described above, The first formwork (46) and the second formwork (47) are erected parallel to each other. The bottom formwork (55) is assembled to the upper end of the second formwork (47), causing the bottom formwork (55) to protrude toward the opposite side of the first formwork (46). The first side formwork (56) is provided on the upper end of the first formwork (46) so as to extend upward from the upper end of the first formwork (46), The second side formwork (57) is erected parallel to the first side formwork (56) at the edge of the bottom formwork (55) opposite to the first side formwork (46), The slab formwork (65) is assembled to the upper end of the second side formwork (57), so that the slab formwork (65) extends from the upper end of the second side formwork (57) toward the opposite side of the first side formwork (56). The support member (76) is erected on the upper end of the second side formwork (57) or on the slab formwork (65). The reinforcing bar assemblies (51 and 52) are placed in the area enclosed by the first side formwork (56), the second side formwork (57), and the bottom formwork (55). The third side formwork (77) is erected on the support (76) parallel to the first side formwork (56), The bridging member (78) is erected between the first side formwork (56) and the third side formwork (77), In the aforementioned region, the anchor (80) is assembled to the reinforcing bar assembly (51 and 52), and the anchor (80) is extended upward from the reinforcing bar assembly (51 and 52) to be assembled to the bridging member (78). An assembly method characterized by the above is provided.
[0017] Claim 9 According to Reinforced concrete structure (10), Beam (50) and, A slab (60) that extends horizontally and is joined to the beam (50), A rising portion (70) is provided on the beam (50) and protrudes upward from the upper surface of the slab (60), An anchor (80) is embedded in the rising portion (70) and protrudes upward from the upper surface of the rising portion (70), At least one permanently embedded support (76) is embedded in the slab (60) so as to penetrate straight through from the upper surface to the lower surface of the slab (60) next to the rising portion (70), A reinforced concrete structure (10) is provided, characterized by having the following features.
[0018] Claim 10 According to Claim 9 The reinforced concrete structure (10) described above, Further equipped with an erected exterior wall, The beam (50) is joined to the upper end of the outer wall, The slab (60) extends horizontally on the inside of the outer wall. A reinforced concrete structure (10) characterized by the above is provided. [Effects of the Invention]
[0019] In this invention, the third side formwork, which is a floating formwork that holds back the fresh concrete in the rising section, is firmly supported. [Brief explanation of the drawing]
[0020] [Figure 1] Figure 1 is a side view of the building. [Figure 2] Figure 2 is a side view of the building before the exterior cladding has been installed. [Figure 3] Figure 3 is a longitudinal cross-sectional view of the upper part of the outer perimeter of the first structural component of the building. [Figure 4] Figure 4 is an explanatory diagram of the assembly process for the reinforced concrete formwork assembly used in the first structural section. [Figure 5] Figure 5 is an explanatory diagram of the assembly process for a reinforced concrete formwork assembly. [Figure 6] Figure 6 is an explanatory diagram of the assembly process for a reinforced concrete formwork assembly. [Figure 7] Figure 7 is an explanatory diagram of the process of pouring concrete into a reinforced concrete formwork assembly. [Modes for carrying out the invention]
[0021] Embodiments will be described below with reference to the drawings. The 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. The scope of the present invention is not limited to the examples in the drawings, as the drawings are provided for illustrative purposes only.
[0022] <1. Buildings> Figure 1 is a side view of Building 1. Figure 2 is a side view showing the main structural parts of Building 1. Building 1 is a multi-story building, specifically a four-story building. The frame of Building 1 comprises a first structural part 10 and a second structural part 20. The first structural part 10 constitutes the lower part of Building 1, more specifically the foundation and the first floor. The first structural part 10 is a reinforced concrete structure. The second structural part 20 constitutes the upper part of Building 1, more specifically the second to fourth floors. The second structural part 20 is made of wood. The second structural part 20 may have a wall structure, a frame structure, or both. A wall structure means that the loads and seismic forces of Building 1 are supported by walls. A frame structure means that the loads and seismic forces of Building 1 are supported by columns, beams, and braces. The second structural part 20 may be constructed using panel construction, frame construction, frame-panel construction, or frame wall construction, or a combination of two or more of these. In one example, the second structural part 20 is a wooden wall structure constructed using a wood panel bonding method, which is a type of panel construction method, and mainly consists of wood panels 31. The wood panel 31 has a wooden frame assembled in a rectangular frame shape, wooden facing materials attached to the front and back surfaces of the frame, respectively, and wooden auxiliary battens arranged vertically, horizontally, or vertically and horizontally inside the frame. The wood panel 31 may also have insulation material filled inside the rectangular frame.
[0023] The first structural unit 10 has a reinforced concrete foundation in the ground. The foundation may be a raft foundation, a strip foundation, a footing, an underground beam, or a pile foundation, or a combination of several of these.
[0024] Figure 3 is a longitudinal cross-sectional view of the upper part of the outer perimeter of the first structural section 10. The first structural section 10 has a reinforced concrete exterior wall 40 erected on the foundation on the outer perimeter of the first floor. The exterior wall 40 is provided along the outer perimeter of the first floor. The exterior wall 40 has a wall reinforcement assembly and concrete 43, and the wall reinforcement assembly has a plurality of vertical reinforcements 41 and a plurality of horizontal reinforcements 42. The vertical reinforcements 41 extend in the vertical direction and are arranged at intervals in the horizontal direction. The horizontal reinforcements 42 extend in the horizontal direction and are arranged at intervals in the vertical direction along the vertical reinforcements 41. The vertical reinforcements 41 and horizontal reinforcements 42 are embedded in the concrete 43. The vertical reinforcements 41 are anchored to the beam 50. The concrete 43 spreads along the vertical reinforcements 41 and horizontal reinforcements 42 and has thickness in the horizontal direction perpendicular to the vertical reinforcements 41 and horizontal reinforcements 42. In the example shown in Figure 3, the exterior wall 40 is of the single reinforcement type. However, the exterior wall 40 may be of the double-reinforced type. In the double-reinforced type, the set of vertical reinforcement bars 41 and horizontal reinforcement bars 42 is doubled in the thickness direction of the exterior wall 40.
[0025] The first structural part 10 has a beam 50 provided on the upper end of the exterior wall 40. The beam 50 extends circumferentially along the outer perimeter of the building 1. The beam 50 has a beam reinforcement assembly and concrete 53, and the beam reinforcement assembly has a plurality of main reinforcements 51 and a plurality of shear reinforcements 52. The shear reinforcements 52 are bent into a rectangular shape. The shear reinforcements 52 are arranged at intervals in the horizontal direction. The main reinforcements 51 extend in the horizontal direction. The main reinforcements 51 are arranged at intervals along the shear reinforcements 52. These main reinforcements 51 are surrounded by the shear reinforcements 52. The main reinforcements 51 and shear reinforcements 52 are embedded in the concrete 53.
[0026] The first structural section 10 has a horizontally extending reinforced concrete slab 60. The outer perimeter of the slab 60 is joined to the beam 50. The slab 60 has a slab reinforcement assembly and concrete 63, and the slab reinforcement assembly has a plurality of main reinforcements 61 and a plurality of distribution reinforcements 62. The main reinforcements 61 extend horizontally parallel to each other. The distribution reinforcements 62 extend horizontally parallel to each other. The distribution reinforcements 62 are arranged perpendicular to the main reinforcements 61. The distribution reinforcements 62 and main reinforcements 61 are anchored to the beam 50 and the second beam. The distribution reinforcements 62 and main reinforcements 61 are embedded in the concrete 63. The concrete 63 extends horizontally along the distribution reinforcements 62 and main reinforcements 61 and has thickness in the vertical direction. In the example shown in Figure 3, the slab 60 is a double-reinforced type, where the sets of main reinforcements 61 and distribution reinforcements 62 are doubled in the thickness direction of the slab 60. However, the slab 60 may be of the single-reinforcement type.
[0027] The first structural section 10 has a reinforced concrete rising section 70 provided on the beam 50. The rising section 70 is provided along the outer perimeter of the building 1. The rising section 70 is formed to protrude above the upper surface of the slab 60. The rising section 70 is located below the outer wall of the second floor of the second structural section 20. The rising section 70 has a rising section reinforcement assembly and concrete 73, and the rising section reinforcement assembly has a plurality of main reinforcements 71 and a plurality of shear reinforcements 72. The main reinforcements 71 are arranged horizontally on the beam reinforcement assembly, parallel to the main reinforcements 51 of the beam reinforcement assembly. The shear reinforcements 72 are bent into a U-shape. The shear reinforcements 72 are arranged at intervals in the horizontal direction. The shear reinforcements 72 are inserted from above the main reinforcements 71 between the shear reinforcements 52 of the beam reinforcement assembly. The shear reinforcements 72 surround the main reinforcements 71 and are fixed to the main reinforcements 71. The shear reinforcement bars 72 are fixed to the main reinforcement bars 51 or the shear reinforcement bars 52 of the beam reinforcement assembly. The main reinforcement bars 71 and the shear reinforcement bars 72 are embedded in concrete 73. The concrete 73 is formed to protrude upward from the concrete 53 of the beam 50.
[0028] The first structural part 10 has one or more permanently embedded support members 76 embedded in the outer edge of the slab 60. The permanently embedded support members 76 penetrate from the upper surface to the lower surface of the slab 60. The upper end of the permanently embedded support member 76 is exposed from the slab 60 next to the rising section 70, and the height of the upper end of the permanently embedded support member 76 is aligned with the height of the upper surface of the slab 60. The lower end of the permanently embedded support member 76 is exposed from the slab 60, and the height of the lower end of the permanently embedded support member 76 is aligned with the height of the lower surface of the slab 60. If there are two or more permanently embedded support members 76, these permanently embedded support members 76 are arranged horizontally at intervals along the side surface of the rising section 70 next to the rising section 70.
[0029] The leveling material 75 has accumulated and solidified on the upper surface of the rising section 70.
[0030] Although not shown in Figure 3, the first structural section 10 has an interior wall made of reinforced concrete erected on the foundation, located inside the exterior wall 40. The first structural section 10 has a second beam that is provided above the upper end of part or all of the interior wall and extends horizontally. The second beam is joined to the slab 60. The first structural section 10 also has a second rising section made of reinforced concrete, provided on the slab 60 or the second beam inside the rising section 70. The second rising section is located below the interior wall of the second floor of the second structural section 20. Leveling material is also formed on the upper surface of the second rising section. The first structural section 10 may also have columns made of reinforced concrete.
[0031] The lower end of the second structural section 20 is fixed to the upper end of the first structural section 10 by a plurality of embedded anchors 80. The embedded anchors 80 are, for example, anchor bolts. The embedded anchors 80 are attached to the upper end of the first structural section 10. The lower part of the embedded anchors 80 is embedded in the concrete 53, 73 of the rising section 70 and the beam 50, and the upper part of the embedded anchors 80 protrudes upward from the upper surface of the rising section 70.
[0032] The second structural section 20 has a rectangular wooden base 21 at the lower end of the outer perimeter of the second floor. The base 21 lies on the upper surface of the rising section 70 and extends horizontally along the outer perimeter of the second floor. A base ring 22 is provided between the base 21 and the upper surface of the rising section 70. The second structural section 20 has a wooden exterior wall 23 on the outer perimeter of the second floor. The exterior wall 23 is installed in an upright position on the foundation 21. The exterior wall 23 is made of wooden panels 31. In the example shown in Figure 3, the exterior wall 23 has a double-layered structure of wooden panels 31. However, the exterior wall 23 may also have a single-layered structure of wooden panels 31.
[0033] The embedded anchor 80 penetrates the base frame 22, the foundation 21, and the lower part of the exterior wall 23, and the nut 81 is tightened to the embedded anchor 80 inside the exterior wall 23. The tightening of the nut 81 contributes to fixing the base frame 22, the foundation 21, and the exterior wall 23 to the upper surface of the rising section 70. The lower part of the exterior wall 23 through which the embedded anchor 80 penetrates refers to the lower frame material of the wooden panel 31. The inside of the exterior wall 23 where the nut 81 is placed refers to the cavity sandwiched between the facing materials of the wooden panel 31. If the second structural section 20 has wooden columns erected on the foundation 21 on the second floor, the lower end of the wooden columns may be fixed to the rising section 70 by the embedded anchor 80.
[0034] <2. Building Construction Methods> In constructing building 1, a reinforced concrete structure, i.e., the first structural part 10, is first constructed on the ground, and then the second structural part 20 is constructed on top of the first structural part 10 using a panel construction method, a frame construction method, a frame-panel construction method, or a frame wall construction method, or a combination of two or more of these methods.
[0035] The construction method for the first structural part 10 is as follows.
[0036] (1) First, construct the foundation so that part or all of the foundation of the first structural part 10 is buried in the ground.
[0037] (2) After the foundation is constructed, the reinforced concrete formwork assembly is assembled. The method for assembling the reinforced concrete formwork assembly is as follows:
[0038] (2-1) If the first structural part 10 has a column made of reinforced concrete, the reinforcing bars for the column are placed first, and then the formwork for the column is assembled.
[0039] (2-2) As shown in Figure 4, after the vertical reinforcement bars 41 and horizontal reinforcement bars 42 of the outer wall 40 of the first structural part 10 are placed, the first formwork 46 and the second formwork 47 for the outer wall 40 are assembled parallel to each other. When placing the vertical reinforcement bars 41, the vertical reinforcement bars 41 are made vertical and spaced horizontally. When placing the horizontal reinforcement bars 42, the horizontal reinforcement bars 42 are made horizontal and spaced vertically along the vertical reinforcement bars 41. When assembling the first formwork 46 and the second formwork 47, the first formwork 46 and the second formwork 47 are erected parallel to each other on both sides of the vertical reinforcement bars 41 and horizontal reinforcement bars 42.
[0040] (2-3) After arranging the vertical and horizontal reinforcement bars for the interior wall of the first structural section 10, the formwork for the interior wall is assembled.
[0041] The order of steps (2-1) to (2-3) described above is not important. Several steps may be carried out in parallel.
[0042] (2-4) After that, the supports for the beam 50 are erected next to the second formwork 47, and these supports are lined up along the formwork 47.
[0043] (2-5) After that, the bottom formwork 55 for the beam 50 is assembled to the upper end of the second formwork 47, and the bottom formwork 55 is extended outwards from the first formwork 46, and the bottom formwork 55 is laid on the shoring. The first side formwork 56 is placed on top of the upper end of the first formwork 46 so that it extends upwards from the upper end of the first formwork 46. The second side formwork 57 is erected parallel to the first side formwork 56 at the edge of the bottom formwork 55 on the opposite side of the first formwork 46. The height of the upper end of the second side formwork 57 is lower than the height of the upper end of the first side formwork 56. The order of these operations does not matter. These operations may be carried out in parallel. Also, the process in (2-4) may be carried out in parallel with the process in (2-5). Furthermore, the stepped portion 56a is provided in a convex shape on the inner surface of the first side formwork 56, along the upper end of the first side formwork 56.
[0044] (2-6) Install scaffolding for the second beam, and assemble the bottom formwork and side formwork for the second beam on top of the scaffolding. Note that step (2-6) may be carried out in parallel with steps (2-4) or (2-5) or both.
[0045] (2-7) After that, the shoring for the slab 60 is installed. Next, the slab formwork 65 is assembled to the upper end of the second side formwork 57, and the slab formwork 65 is extended from the upper end of the second side formwork 57 toward the opposite side of the first side formwork 56, and the slab formwork 65 is laid on the shoring. When laying the slab formwork 65, the slab formwork 65 is assembled to the side formwork for the second beam. Step (2-7) may be carried out in parallel with steps (2-4), (2-5), or (2-6), or two or more of these steps.
[0046] (2-8) After that, the main reinforcement bars 51 and shear reinforcement bars 52 are placed in the area enclosed by the bottom formwork 55 and the side formwork 56, 57 to assemble the beam reinforcement assembly consisting of these main reinforcement bars 51 and shear reinforcement bars 52. The main reinforcement bars and shear reinforcement bars for the second beam are also placed inside the formwork for the second beam. Alternatively, after assembling the beam reinforcement assembly from the main reinforcement bars 51 and shear reinforcement bars 52 on the ground, the beam reinforcement assembly may be placed in the area enclosed by the bottom formwork 55 and the side formwork 56, 57 using a crane or the like. Also, if it is after the process in (2-5), the process in (2-8) may be carried out in parallel with the process in (2-6) or (2-7) or both.
[0047] (2-9) Subsequently, the main reinforcement bars 61 and distribution bars 62 of the slab are placed on the slab formwork 65 to assemble the slab reinforcement assembly consisting of these main reinforcement bars 61 and distribution bars 62. Note that step (2-9) may be carried out in parallel with step (2-8).
[0048] (2-10) Subsequently, the embedded anchors 80 are erected vertically in the area enclosed by the bottom formwork 55 and the side formwork 56, 57, and the embedded anchors 80 are attached to the main reinforcement bars 51 or the shear reinforcement bars 52 or both, extending the embedded anchors 80 upward from the beam reinforcement assembly. Note that step (2-11) may be carried out in parallel with step (2-8). Alternatively, when assembling the beam reinforcement assembly on the ground, the embedded anchors 80 may be attached to the main reinforcement bars 51 or the shear reinforcement bars 52 or both on the ground, and the beam reinforcement assembly may be placed together with the embedded anchors 80 in the area enclosed by the bottom formwork 55 and the side formwork 56, 57 using a crane or the like.
[0049] (2-11) Then, as shown in Figure 5, the main reinforcement bars 71 are placed on top of the beam reinforcement assembly parallel to the main reinforcement bars 51 of the beam reinforcement assembly, and the shear reinforcement bars 72 are inserted from above the main reinforcement bars 71 between the shear reinforcement bars 52 of the beam reinforcement assembly, and these main reinforcement bars 71 and shear reinforcement bars 72 are fixed with binding wire or the like. The shear reinforcement bars 72 are fixed to the main reinforcement bars 51 or shear reinforcement bars 52 of the beam reinforcement assembly with binding wire. The main reinforcement bars 71 or shear reinforcement bars 72 may also be fixed to the embedded anchors 80 with binding wire or the like. Note that step (2-11) may be carried out in parallel with step (2-9) or (2-10). When assembling the beam reinforcement assembly on the ground, the vertical reinforcement assembly may also be assembled on the ground together.
[0050] (2-12) Then, as shown in Figure 6, the permanently embedded support 76 is erected on the upper end of the second side formwork 57 or on the edge of the upper surface of the slab formwork 65. If multiple permanently embedded support 76 are used, these permanently embedded support 76 are arranged along the edge of the upper surface of the slab formwork 65.
[0051] (2-13) Then, the third formwork 77 is erected on the embedded support 76 parallel to the first formwork 56, and the third formwork 77 is moved upward away from the slab formwork 65. The third formwork 77 is a floating formwork. A bridging member 78 is erected between the upper end of the third formwork 77 and the upper end of the first formwork 56, and both ends of the bridging member 78 are fixed to the upper ends of the third formwork 77 and the first formwork 56, respectively. The bridging member 78 is a rod-shaped or strip-shaped member. The bridging member 78 has holes formed in it for passing embedded anchors 80 through, and the embedded anchors 80 may be passed through depending on the installation of the bridging member 78. When installing the bridging member 78, the bridging member 78 may be placed adjacent to the embedded anchors 80.
[0052] (2-14) After that, the embedded anchors 80 are fixed to the bridging members 78 with binding wire or the like. By fixing the embedded anchors 80 to the bridging members 78, the bridging members 78 are stabilized, and consequently the third side formwork 77 is also stabilized. Note that the order of steps (2-12), (2-13), and (2-14) may be changed. For example, they may be performed in the order of (2-12), (2-14), and (2-13), (2-13), (2-12), and (2-14), (2-13), (2-14), (2-12), (2-14), (2-12), and (2-13), or (2-14), (2-13), and (2-12). Also, steps (2-12), (2-13), and (2-14) may be performed in parallel. At least one of steps (2-12), (2-13), and (2-14) may be performed before step (2-11), or at least one of steps (2-12), (2-13), and (2-14) may be performed in parallel with step (2-11).
[0053] (2-15) The floating formwork for the second rising section is assembled so as to float above the slab formwork 65 or the bottom formwork for the second beam, and the main reinforcement and shear reinforcement for the second rising section are placed inside the floating formwork, and embedded anchors are also provided inside the floating formwork and protrude upward.
[0054] As a result, the reinforced concrete formwork assembly is completed. In the completed reinforced concrete formwork assembly, the third formwork 77 is supported by the embedded support 76 and also supported by the first formwork 56 through the bridging member 78. Furthermore, the third formwork 77 is supported by the beam reinforcement assembly through the bridging member 78 and the embedded anchor 80. Therefore, the posture of the third formwork 77 is stable and no displacement of the third formwork 77 occurs.
[0055] (3) After the completion of the reinforcing bar formwork assembly, ready-mix concrete 110 is poured into the reinforcing bar formwork assembly as shown in Figure 7. Specifically, ready-mix concrete 110 is poured inside the formwork for the columns and the formwork for the interior walls. Ready-mix concrete 110 is poured between the first formwork 46 and the second formwork 47 for the exterior wall 40, and the vertical reinforcement bars 41 and horizontal reinforcement bars 42 of the wall reinforcement assembly are embedded in the ready-mix concrete 110. Ready-mix concrete 110 is poured inside the formwork for the second beam. Ready-mix concrete 110 is poured into the area enclosed by the bottom formwork 55 and the side formwork 56, 57, and the lower parts of the main reinforcement bars 51 and shear reinforcement bars 52 of the reinforcement assembly, the shear reinforcement bars 72 of the rising reinforcement assembly and the lower parts of the embedded anchors 80 are embedded in the ready-mix concrete 110. Freshly prepared concrete 110 is poured onto the slab formwork 65 up to the level of the lower end of the third side formwork 77, and the main reinforcement bars 61 and distribution bars 62 of the slab reinforcement assembly and the permanently embedded support members 76 are embedded in the freshly prepared concrete 110. Freshly prepared concrete 110 is poured inside the floating formwork for the second rising section. Freshly prepared concrete 110 is poured between the third side formwork 77 and the stepped section 56a of the first side formwork 56, and the upper part of the shear reinforcement bars 72 and the main reinforcement bars 71 of the rising section reinforcement assembly are embedded in the freshly prepared concrete 110. The level of the freshly prepared concrete 110 poured between the third side formwork 77 and the stepped section 56a of the first side formwork 56 is higher than the level of the freshly prepared concrete 110 poured onto the slab formwork 65, but lower than the level of the bridging members 78. Therefore, the bridging members 78 are not embedded in the freshly prepared concrete 110. When the ready-mixed concrete 110 is poured between the third formwork 77 and the stepped portion 56a of the first formwork 56, Because the third side formwork 77 is firmly supported, the third side formwork 77 resists the flow and pressure of the ready-mixed concrete 110, preventing collapse and displacement of the third side formwork 77. During or after the placement of the ready-mixed concrete 110, the concrete 110 is compacted as needed to make it dense.
[0056] (4) After the ready-mix concrete 110 has been cured and hardened, leveling material 75 is applied to the concrete 73 of the rising section 70. Leveling material is also applied to the second rising section. Leveling material may also be applied to the slab 60.
[0057] (5) After that, demolding is carried out. That is, the formwork 46, 47, 56, 57, 65, 77 and the bridging members 78 are dismantled, and the formwork for the inner wall, the second beam and the second rising section is dismantled. Note that step (4) may be carried out after step (5).
[0058] After constructing the first structural section 10 on the ground as described above, the second structural section 20 is constructed on top of the first structural section 10 using a panel construction method, a frame construction method, a frame-panel construction method, or a frame wall construction method, or a combination of two or more of these methods.
[0059] <3. Summary> (1) As shown in Figures 6 and 7, since the bridging member 78 is installed between the first side formwork 56 and the third side formwork 77, the third side formwork 77 is firmly supported by the first side formwork 56, and the distance between the third side formwork 77 and the first side formwork 56 is maintained. Since the embedded anchors 80 are attached to the beam reinforcement assembly and the bridging member 78, the bridging member 78 is firmly supported by the beam reinforcement assembly, and the third side formwork 77 is firmly supported by the beam reinforcement assembly through the bridging member 78 and the embedded anchors 80. Because the embedded anchors 80 not only perform their original function but also support the third side formwork 77, the embedded anchors 80 contribute to reducing the amount of materials used and improving the efficiency of construction work.
[0060] (2) As shown in Figure 7, the exterior wall 40 is formed by pouring ready-mix concrete 110 between the first formwork 46 and the second formwork 47.
[0061] (3) As shown in Figure 7, the slab 60 is formed by pouring ready-mix concrete 110 onto the slab formwork 65 up to the lower end of the third side formwork 77, and the embedded support 76 is embedded in the slab 60.
[0062] (4) As shown in Figure 7, by pouring ready-mix concrete 110 into the area enclosed by the first side formwork 56, the second side formwork 57 and the bottom formwork 55 up to the lower end of the third side formwork 77, the beam 50 and the rising section 70 are formed without being poured in a joint, and the lower part of the embedded anchor 80 is embedded in the beam 50 and the rising section 70. Because the third side formwork 77 is firmly supported, collapse and displacement of the third side formwork 77 do not occur when pouring the concrete 110. Therefore, a high-quality rising section 70 is formed.
[0063] (5) As shown in Figure 7, since the beam 50 and the rising section 70 are formed without construction joints, no cold joints occur at the boundary between the beam 50 and the rising section 70. Construction joint creation work and waterproofing treatment are unnecessary, and subsequent construction joint maintenance work is also unnecessary. On the surface of the beam 50 and the rising section 70, the joint between the beam (50) and the rising section 70 is not visible, resulting in a high aesthetic quality for the reinforced concrete structure 10.
[0064] (6) The ready-mixed concrete 110 poured into the area enclosed by the first side formwork 56, the second side formwork 57, and the bottom formwork 55 is higher than the level of the ready-mixed concrete 110 poured on top of the slab formwork 65, but lower than the level of the bridging material 78. In this way, the bridging material 78 is not embedded in the ready-mixed concrete 110, resulting in good performance for the beam 50 and the rising section 70. Here, "level" refers to the position in the vertical direction.
[0065] (7) Because the first structural part 10 of Building 1 is made of reinforced concrete, Building 1 has high seismic resistance and a long lifespan. Therefore, Building 1 contributes to achieving goals such as "creating cities and communities where people can live" and "SDGs (Sustainable Development Goals)".
[0066] (8) The second structural section 20 of building 1 is made of wood. The energy used from the production to the disposal of the wood used in the second structural section 20 is less than the energy used from the production to the disposal of metal or concrete materials. Therefore, the second structural section 20, and by extension building 1, contribute to the realization of a decarbonized society by promoting carbon neutrality, which effectively reduces carbon dioxide emissions to zero, and to the achievement of the Sustainable Development Goals (SDGs). [Explanation of Symbols]
[0067] 1. Building 10. First Structural Section (Reinforced Concrete Structure) 40 Exterior Wall 46. Formwork No. 1 47. Second formwork 50 beams 51 Main reinforcement 52 Shear reinforcement bars 55 Bottom formwork 56 First side formwork 57 Second side formwork 76. Buried support device 77 Third side formwork 60 slab 65 Formwork for slabs 110 Ready-mix concrete
Claims
1. A reinforced concrete formwork assembly, First side formwork for beams and rising sections, A second side formwork for a beam is erected parallel to the first side formwork and has an upper end lower than the upper end of the first side formwork, A bottom formwork for a beam is provided between the first side formwork and the second side formwork, A slab formwork extending from the upper end of the second side formwork toward the opposite side of the first side formwork, A support erected on the upper end of the second side formwork or on the slab formwork, A third side formwork for the rising section is erected on the support parallel to the first side formwork, A bridging member installed between the first side formwork and the third side formwork, A reinforcement assembly for a beam, which is placed in the area enclosed by the first side formwork, the second side formwork, and the bottom formwork, An anchor is assembled in the aforementioned region to the reinforcing steel assembly, extends upward from the reinforcing steel assembly, and is assembled to the bridging member, Equipped with, The third side formwork is positioned directly above the upper end of the second side formwork, The support is erected upright on the upper end of the second side formwork or on the slab formwork. A reinforced concrete formwork assembly characterized by the following features.
2. A reinforced concrete formwork assembly according to claim 1, The reinforcing bar assembly protrudes above the slab formwork from between the first side formwork and the second side formwork. A reinforced concrete formwork assembly characterized by the following features.
3. A reinforced concrete formwork assembly according to claim 1, It comprises a first formwork and a second formwork for the exterior wall, which are erected parallel to each other. The first side formwork is provided on the upper end of the first formwork so as to extend upward from the upper end of the first formwork. The bottom formwork extends from the upper end of the second formwork toward the opposite side of the first formwork, The second side formwork is erected parallel to the first side formwork at the edge of the bottom formwork opposite to the first side formwork. A reinforced concrete formwork assembly characterized by the following features.
4. A method for constructing a reinforced concrete structure using the reinforced concrete formwork assembly described in claim 1, By pouring concrete onto the slab formwork up to the lower end of the third side formwork, the support is embedded in the concrete. By pouring concrete into the area up to the lower end of the third formwork, the lower part of the anchor and the reinforcing steel assembly are embedded in the concrete. A construction method characterized by the following.
5. A method for constructing a reinforced concrete structure using the reinforced concrete formwork assembly described in claim 3, Concrete is poured between the first formwork and the second formwork. By pouring concrete onto the slab formwork up to the lower end of the third side formwork, the support is embedded in the concrete. By pouring concrete into the area up to the lower end of the third formwork, the lower part of the anchor and the reinforcing steel assembly are embedded in the concrete. A construction method characterized by the following.
6. A construction method according to claim 4, The level of the concrete poured into the aforementioned area is higher than the level of the concrete poured on top of the slab formwork, and lower than the level of the bridging material. A construction method characterized by the following.
7. A method for assembling a reinforced concrete formwork assembly according to claim 1, The bottom formwork is laid, the first side formwork and the second side formwork are erected parallel to each other on both sides of the bottom formwork, the slab formwork is assembled to the upper end of the second side formwork, and the slab formwork is extended from the upper end of the second side formwork toward the opposite side of the first side formwork. The support is erected on the upper end of the second side formwork or on the slab formwork. The reinforcement assembly is placed in the area enclosed by the first side formwork, the second side formwork, and the bottom formwork. The third formwork is erected on the support parallel to the first formwork, The bridging member is erected between the first side formwork and the third side formwork. In the aforementioned region, the anchor is assembled to the reinforcing steel assembly, the anchor is extended upward from the reinforcing steel assembly, and the anchor is assembled to the bridging member. An assembly method characterized by the above.
8. A method for assembling a reinforced concrete formwork assembly according to claim 3, The first formwork and the second formwork are erected parallel to each other, The bottom formwork is assembled to the upper end of the second formwork, causing the bottom formwork to extend outwards from the first formwork. The first side formwork is provided on the upper end of the first formwork so as to extend upward from the upper end of the first formwork, The second side formwork is erected parallel to the first side formwork at the edge of the bottom formwork opposite to the first side formwork, The slab formwork is assembled to the upper end of the second formwork, and the slab formwork is extended from the upper end of the second formwork toward the opposite side of the first formwork. The support is erected on the upper end of the second side formwork or on the slab formwork. The reinforcement assembly is placed in the area enclosed by the first side formwork, the second side formwork, and the bottom formwork. The third formwork is erected on the support parallel to the first formwork, The bridging member is erected between the first side formwork and the third side formwork. In the aforementioned region, the anchor is assembled to the reinforcing steel assembly, the anchor is extended upward from the reinforcing steel assembly, and the anchor is assembled to the bridging member. An assembly method characterized by the above.
9. A reinforced concrete structure, Beams and, A slab that extends horizontally and is joined to the beam, A rising portion is provided on the beam and protrudes upward from the upper surface of the slab, An embedded anchor is embedded in the rising portion and protrudes upward from the upper surface of the rising portion, At least one permanently embedded support is embedded in the slab so as to penetrate straight through from the upper surface to the lower surface of the slab next to the rising portion, A reinforced concrete structure characterized by having the following features.
10. A reinforced concrete structure according to claim 9, Further equipped with an erected exterior wall, The beam is joined to the upper end of the outer wall, The slab extends horizontally on the inside of the outer wall. A reinforced concrete structure characterized by the following.