Top floor slab construction method

Abstract

To improve workability of a top floor slab.SOLUTION: There is provided a top floor slab construction method in which an end of a top floor slab S is joined to a steel plate concrete wall W constructed by placing wall concrete 2 between a pair of opposing steel plates 1. An end of a steel beam 5 is placed on the upper end face of the steel plate concrete wall W so that steel beams 5 made of shaped steel are horizontally arranged at predetermined intervals. After a slab steel plate 6 forming the bottom of the top floor slab S is stretched over a lower flange 5B of the adjacent steel beams 5, a slab reinforcing bar 7 is arranged above the steel beam 5, and slab concrete 8 is placed on the slab steel plate 6 to construct the top floor slab S.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for constructing a top floor slab in which the edge of the top floor slab is joined to a steel plate concrete wall constructed by pouring wall concrete between a pair of opposing steel plates. [Background technology]

[0002] The background art of the present invention is a method for constructing a large slab in which the end of a PC floor slab is placed on the top end of the existing concrete wall of the reinforced concrete floor below, the corner angle of the top end is welded to the corner angle of the PC floor slab, and rebars (on-site installation type) for fixing the PC floor slab are connected to the embedded rebars in the PC floor slab via rebar joint couplers (grout type), and the top floor rebars are arranged so that the end side of the top floor rebar passes between the vertical wall rebars extending upward from the existing concrete wall of the floor below and is positioned above the existing concrete wall of the floor below, and then cast-in-place concrete is poured to fix the slab to the wall (see, for example, Patent Document 1).

[0003] Furthermore, at the joint between the upper edge of a steel concrete earthquake-resistant wall and a reinforced concrete floor slab composed of floor reinforcing bars and floor concrete on the exterior perimeter of the top floor building, inverted U-shaped reinforcing bars are arranged at the upper edge of the steel concrete earthquake-resistant wall, and the floor reinforcing bars are arranged so that the end side of the lower end bar of the floor reinforcing bars penetrates the inner surface steel plate of a pair of surface steel plates in the steel concrete earthquake-resistant wall, passes between the inverted U-shaped reinforcing bars, and is positioned between the pair of surface steel plates (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 07-077596 [Patent Document 2] Patent No. 2670199 Summary of the Invention [Problem to be solved by the invention]

[0005] In the technology described in Patent Document 1, constructing a slab requires the effort of welding the corner angles of the existing wall concrete on the lower floor to the corner angles of the PC floor slab, as well as the effort of connecting the rebars for fixing the PC floor slab to the embedded rebars in the PC floor slab and passing the ends of the upper floor reinforcement between the vertical reinforcement in the wall, so there is room for improvement in terms of improving the workability of the slab.

[0006] In the technology described in Patent Document 2, when constructing the top floor slab, in addition to the time and effort required to arrange inverted U-shaped reinforcing bars on the upper edge of the steel concrete shear wall, it is also necessary to make multiple through holes in the inner surface steel plate of the pair of surface steel plates in the steel concrete shear wall so that the floor reinforcing bars can pass through between the inverted U-shaped reinforcing bars. Therefore, there is room for improvement in terms of improving the workability of the slab.

[0007] In view of this situation, a main object of the present invention is to improve the workability of the top floor slab. [Means for solving the problem]

[0008] The first characteristic configuration of the present invention is a construction method for a top floor slab in which an end of the top floor slab is joined to a steel plate concrete wall constructed by pouring wall concrete between a pair of opposing steel plates, The ends of the steel beams are placed on the upper end surfaces of the steel plate concrete walls so that a plurality of steel beams made of shaped steel are arranged horizontally at predetermined intervals, and slab steel plates that form the bottom of the top floor slab are hung between the lower flanges of adjacent steel beams. Then, slab reinforcing bars are arranged above the steel beams, and slab concrete is poured onto the slab steel plates to construct the top floor slab. Of the pair of steel plates, the outer steel plate forming the outer wall surface of the steel concrete wall has an extension portion that extends upward relative to the inner steel plate forming the inner wall surface of the steel concrete wall, and a number of studs are provided on the inner surface of the extension portion; The steel beam has an end The outer steel plate is inserted close to the inner surface of the extension portion.It is placed on the upper end surface of the steel plate concrete wall in a state close to the stud, The end of the slab reinforcing bar is bent into a hanging part that hangs down along the inner surface of the extension part of the outer steel plate, and the hanging part is In a state close to the inner surface of the extension portion The point is that the reinforcement is arranged to pass between the studs.

[0009] According to this configuration, when constructing the top floor slab, such as a rooftop floor or roof balcony, the ends of each steel beam are stably placed on the upper surface of the steel plate concrete wall, so that each steel beam can be used as support, and a steel plate concrete slab (SC slab) using slab steel plates instead of bottom end reinforcement can be easily constructed as the top floor slab. After the top floor slab is constructed, each steel beam contributes to reinforcing the top floor slab as an internal beam built into the top floor slab, ensuring the strength of the top floor slab while improving workability by reducing the thickness of the slab steel plates and the diameter of the slab rebar.

[0010] However, for example, when joining the top floor slab and a steel concrete wall in a manner that allows stress transmission, with the end of the top floor slab abutting the inner wall surface of the steel concrete wall, it is necessary to take the time to form multiple through holes in the inner steel plate that forms the inner wall surface of the steel concrete wall in order to fix the ends of the slab reinforcing bars to the wall concrete inside the steel concrete wall. In contrast, in this configuration, by placing the ends of each steel beam on the upper end surface of the steel concrete wall, the ends of the slab reinforcing bars arranged above the steel beams, as well as the ends of each steel beam, are positioned directly above the wall concrete in the steel concrete wall. When the slab concrete is poured in this state and integrated with the wall concrete, the ends of each steel beam and the ends of the slab reinforcing bars are fixed to the wall concrete inside the steel concrete wall. This makes it possible to join the top floor slab and the steel concrete wall in a way that allows stress to be transmitted, without the need for the effort of drilling multiple through holes in the inner steel plate.

[0011] As a result, the workability of the top floor slab can be improved, the top floor slab can be joined to the steel plate concrete wall in a way that allows stress to be transmitted, and the top floor slab can be reinforced in an efficient manner, making it easy to increase the span of the top floor slab.

[0012] The second characteristic configuration of the present invention is: The aforementioned The upper end of the extension is formed to be positioned above the upper surface of the top floor slab.

[0013] According to this configuration, the extension portion of the outer steel plate is positioned outside the ends of the steel beams and the slab steel plates and surrounds the steel beams and slab steel plates, so the extension portion of the outer steel plate can be used as a slab formwork when pouring the top floor slab concrete onto the slab steel plates. In addition, by utilizing the extension of the outer steel plate, a parapet can be easily constructed around the outer periphery of the top floor slab. As a result, the workability of the top floor slab can be further improved, and the top floor slab can be constructed more rationally. Furthermore, by utilizing the extension portion of the outer steel plate, for example, the end side of the slab reinforcement can be bent so that the end of the slab reinforcement forms a hanging portion that hangs down along the inner surface of the extension portion, and when the slab concrete on the top floor is poured and integrated with the wall concrete, the end of the slab reinforcement will be rationally fixed to the wall concrete within the steel concrete wall with a longer fixed length, thereby making it possible to join the top floor slab and the steel concrete wall in a way that allows for more optimal stress transmission. As a result, the top floor slab and the steel plate concrete wall can be joined in a manner that allows for more optimal stress transmission.

[0014] A third characteristic configuration of the present invention is a construction procedure for constructing the top floor slab, a slab construction area forming process in which the steel plate concrete wall is installed to form a slab construction area for the top floor surrounded by the extension portion; a slab steel material placing process in which the ends of the steel beams are placed on the upper end surfaces of the steel plate concrete walls so that the plurality of steel beams are aligned horizontally at predetermined intervals in the slab construction area, and the slab steel plates are laid across the lower flanges of the adjacent steel beams; a slab reinforcing bar arrangement process in which the slab reinforcing bars are arranged above the steel beams along the upper flanges of the steel beams in the slab construction area; and a slab concrete pouring process in which the slab concrete is poured onto the slab steel plate in the slab construction area.

[0015] According to this configuration, when constructing the top floor slab, each steel beam is used as support, and after the top floor slab is constructed, each steel beam is used as an internal beam for reinforcement built into the top floor slab, allowing the top floor slab to be rationally constructed in a state where stress can be transmitted to the steel plate concrete wall. [Brief explanation of the drawings]

[0016] [Figure 1] Vertical cross section of the main part showing the construction method of the top floor slab DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings. The construction method for the top floor slab exemplified in this embodiment is suitable for constructing the top floor slab of a rooftop floor, roof balcony, etc.

[0018] In the construction method of the top floor slab exemplified in this embodiment, as shown in Figure 1, multiple steel plate concrete walls W placed on the top floor of the structure and the ends of the top floor slab S connected to the top of these steel plate concrete walls W are joined in a rigid joint state or a state equivalent to a rigid joint.

[0019] Each steel concrete wall W is constructed by pouring wall concrete 2 between a pair of opposing steel plates 1. The pair of steel plates 1 are connected via a number of tie bars 3 or the like that have a certain length and span the pair of steel plates 1, ensuring a certain distance between the pair of steel plates 1 for pouring wall concrete. A number of studs 4 are welded horizontally to the inner surface of each steel plate 1 to structurally integrate the steel plate 1 and the wall concrete 2. Of the pair of steel plates 1, the outer steel plate 1A that forms the outer wall surface of the steel concrete wall W has an extension portion 1a that extends above the inner steel plate 1B that forms the inner wall surface of the steel concrete wall W, and the upper end of this extension portion 1a is formed to be located above the top surface of the top floor slab S.

[0020] The top floor slab S is constructed as a steel concrete slab by arranging multiple steel beams 5 made of H-shaped steel in each slab construction area surrounded by the extensions 1a of the outer steel plates 1A of multiple steel concrete walls W, laying multiple slab steel plates 6 that form the bottom of the top floor slab S, arranging slab reinforcing bars 7 above each steel beam 5, and pouring slab concrete 8 onto the slab steel plates 6 in the slab construction area. A large number of studs 9 are welded horizontally to the inner surface of the extensions 1a of each outer steel plate 1A to structurally integrate the extensions 1a and the slab concrete 8.

[0021] The steel beams 5 are arranged horizontally at predetermined intervals in the slab construction area, with the ends of each steel beam 5 resting on the upper end surface of the steel concrete wall W. The ends of each steel beam 5 are temporarily fastened while placed on the upper end surface of the steel concrete wall W by sleeves 10 driven into the upper end of the wall concrete 2 in the steel concrete wall W and by embedded temporary fastening bolts 11 screwed into the sleeves 10. A large number of studs 12 are welded horizontally to the webs 5A of each steel beam 5 to structurally integrate each steel beam 5 with the concrete slab 8. For each steel beam 5, materials other than H-shaped steel materials, such as I-shaped steel materials or a pair of back-to-back channel steel materials, can be used.

[0022] Each slab steel plate 6 is suspended across the lower flange 5B of the adjacent steel beam 5 in the slab construction area. A large number of studs 13 are welded in an upright position to the upper surface of each slab steel plate 6 to structurally integrate the slab steel plate 6 with the slab concrete 8.

[0023] Each slab reinforcing bar 7 is arranged in a grid pattern above the upper flange 5C of each steel beam 5, with the vertical direction intersecting the steel beam 5 and the horizontal direction parallel to it. The end of each slab reinforcing bar 7 is arranged in a bent state to form a hanging part 7a that hangs down along the inner surface of the extension part 1a of the outer steel plate 1A.

[0024] The construction procedure for constructing the top floor slab S involves first installing each steel plate concrete wall W on the top floor of the structure and forming a slab construction area for the top floor surrounded by the extensions 1a of the outer steel plates 1A in a slab construction area formation process. Next, in the slab construction area, multiple steel beams 5 are aligned horizontally at a predetermined interval, with the ends of each steel beam 5 placed on the upper end surfaces of the steel plate concrete walls W. The ends of each steel beam 5 are temporarily fastened to the upper end surfaces of the steel plate concrete walls W with temporary fastening bolts 11 or the like, and each slab steel plate 6 is placed across the lower flanges 5B of adjacent steel beams 5 in a slab steel material placement process. After this slab steel material placement process, a slab rebar arrangement process is performed in which slab rebar 7 is placed above the steel beams 5 at a predetermined interval from the upper flanges 5C of the steel beams 5 and the inner surfaces of the extensions 1a of the outer steel plates 1A in the slab construction area. After this slab rebar arrangement step, a slab concrete pouring step is carried out in which slab concrete 8 is poured onto the slab steel plates 6 in the slab construction area, using the extensions 1a of each outer steel plate 1A as slab formwork.

[0025] In other words, according to the construction method for the top floor slab S exemplified in this embodiment, when constructing a top floor slab S such as a rooftop floor or roof balcony, the ends of each steel beam 5 can be stably supported by the steel plate concrete wall W, and as a result, a steel plate concrete slab (SC slab) using slab steel plates 6 instead of bottom end reinforcement can be easily constructed as the top floor slab S while using each steel beam 5 as support.

[0026] After the top floor slab S is constructed, each steel beam 5 can be used as an internal beam built into the top floor slab S to contribute to reinforcing the top floor slab S, thereby ensuring the strength of the top floor slab S while improving workability by reducing the thickness of the slab steel plates 6 and the diameter of the slab reinforcing bars 7.

[0027] However, for example, when joining the top floor slab S and the steel concrete wall W in a manner that allows stress to be transmitted, with the end of the top floor slab S butted against the inner wall surface of the steel concrete wall W, in order to fix the end of the slab reinforcing bar 7 to the wall concrete 2 inside the steel concrete wall W, it will be necessary to take the time to form multiple through holes in the inner steel plate 1B that forms the inner wall surface of the steel concrete wall W to allow the slab reinforcing bar 7 to pass through.

[0028] In contrast, in the construction method for the top floor slab S exemplified in this embodiment, the ends of each steel beam 5 are placed on the upper end surface of the steel concrete wall W, so that the ends of the slab reinforcing bars 7 arranged above the steel beams 5, as well as the ends of each steel beam 5, are positioned directly above the wall concrete 2 in the steel concrete wall W, and when the slab concrete 8 is poured in this state and integrated with the wall concrete 2, the ends of each steel beam 5 and the ends of the slab reinforcing bars 7 are fixed to the wall concrete 2 inside the steel concrete wall W. This makes it possible to join the top floor slab S and the steel concrete wall W in a manner that allows stress to be transmitted, without requiring the effort of forming multiple through holes in the inner steel plate 1B.

[0029] Furthermore, since the extension portion 1a of each outer steel plate 1A is positioned outside the ends of the steel beams 5 and the slab steel plates 6 and surrounds the steel beams 5 and the slab steel plates 6, the extension portion 1a of each outer steel plate 1A can be used as a slab formwork when pouring the top floor slab concrete 8 on the slab steel plates 6.

[0030] Furthermore, because the ends of each slab reinforcing bar 7 become the hanging parts 7a, when the top floor slab concrete 8 is poured and integrated with the wall concrete 2, the ends of the slab reinforcing bars 7 are rationally anchored to the wall concrete 2 within the steel concrete wall W with a longer anchorage length. In other words, the hanging parts 7a of each slab reinforcing bar 7 can be used as anchorages for more suitably anchoring the ends of each slab reinforcing bar 7 to the wall concrete 2, and therefore the top floor slab S and the steel concrete wall W can be joined in a manner that allows for more suitable stress transmission. Furthermore, as an anchoring portion for more suitably anchoring the end of each slab reinforcing bar 7 to the wall concrete 2, instead of the hanging portion 7a of each slab reinforcing bar 7, an enlarged diameter portion may be provided at the end of the slab reinforcing bar 7.

[0031] In addition, by utilizing the extensions 1a of each outer steel plate 1A, a parapet 14 can be easily constructed around the outer periphery of the top floor slab S.

[0032] As a result, while improving the workability of the top floor slab S equipped with the parapet 14, the top floor slab S can be suitably joined to the steel plate concrete wall W in a manner that allows stress to be transmitted, and reinforcement of the top floor slab S can be carried out rationally, making it easy to increase the span of the top floor slab S.

[0033] [Another embodiment] Another embodiment of the present invention will now be described. The configurations of the other embodiments described below are not limited to being applied alone, but can also be applied in combination with the configurations of the above-described embodiment or other other embodiments.

[0034] (1) In the above embodiment, the steel plate concrete wall W is exemplified as being configured such that the outer steel plate 1A of the pair of steel plates 1 has an extension portion 1a extending upwardly above the inner steel plate 1B, but this is not limited thereto, and the outer steel plate 1A may be configured without having an extension portion 1a. [Explanation of symbols]

[0035] 1 steel plate 1A outer steel plate 1a Extension part 1B Inner steel plate 2. Wall concrete 5 Steel beams 5B Lower flange 5C Upper flange 6. Slab steel plate 7 Slab reinforcement 8. Slab concrete S Top floor slab W steel plate concrete wall

Claims

1. A construction method for a top floor slab in which the edge of the top floor slab is joined to a steel plate concrete wall constructed by pouring wall concrete between a pair of opposing steel plates, The ends of the steel beams are placed on the upper end surfaces of the steel plate concrete walls so that a plurality of steel beams made of shaped steel are arranged horizontally at predetermined intervals, and slab steel plates that form the bottom of the top floor slab are hung between the lower flanges of adjacent steel beams. Then, slab reinforcing bars are arranged above the steel beams, and slab concrete is poured onto the slab steel plates to construct the top floor slab. Of the pair of steel plates, the outer steel plate forming the outer wall surface of the steel concrete wall has an extension portion that extends upward relative to the inner steel plate forming the inner wall surface of the steel concrete wall, and a number of studs are provided on the inner surface of the extension portion; The steel beam is placed on the upper end surface of the steel plate concrete wall with its end portion entering close to the inner surface of the extension portion of the outer steel plate and in close proximity to the stud on the inner surface, A construction method for a top floor slab in which the slab reinforcing bars are bent at their ends into hanging parts that hang down along the inner surface of the extension part of the outer steel plate, and the hanging parts are arranged so that they pass between the studs while being close to the inner surface of the extension part.

2. 2. A top floor slab construction method according to claim 1, wherein the upper end of the extension portion is formed to be positioned above the upper surface of the top floor slab.

3. The construction procedure for constructing the top floor slab is as follows: a slab construction area forming process in which the steel plate concrete wall is installed to form a slab construction area for the top floor surrounded by the extension portion; a slab steel material placing process in which the ends of the steel beams are placed on the upper end surfaces of the steel plate concrete walls so that the plurality of steel beams are aligned horizontally at predetermined intervals in the slab construction area, and the slab steel plates are laid across the lower flanges of the adjacent steel beams; a slab reinforcing bar arrangement process in which the slab reinforcing bars are arranged above the steel beams along the upper flanges of the steel beams in the slab construction area; 3. The method for constructing a top floor slab according to claim 2, wherein a slab concrete pouring step is performed in that order, and a slab concrete pouring step is performed in which the slab concrete is poured onto the slab steel plate in the slab construction area.

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