Slab construction method and beam member

Abstract

To improve the workability of a slab while using a conventional form as a bottom form of the slab.SOLUTION: A construction method of a slab 80 includes: a form temporary construction step of installing a temporary deck 100 on a temporary receiving member 90 detachably attached to adjacent internal steel beams 30 and temporary steel beams 60, and laying a conventional form 102 on the temporary deck 100; a slab construction step of placing slab concrete 82 on the conventional form 102; and a removal step of removing the temporary receiving member 90, the temporary deck 100, and the conventional form 102 after the slab concrete 82 is cured.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a slab construction method and a beam member. [Background technology]

[0002] 2. Description of the Related Art Deck plates that serve as the bottom formwork for a slab are known (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-054354 A [Patent Document 2] JP 2022-026964 A [Patent Document 3] JP 2023-067236 A Summary of the Invention [Problem to be solved by the invention]

[0004] By the way, when a conventional formwork is used as the bottom formwork for a slab, the underside of the slab can be finished in an exposed concrete state, thereby improving the design.

[0005] In this case, however, the workability of the slab may be reduced because of the time and effort required for setting up and removing the temporary supports that support the conventional formwork.

[0006] In consideration of the above, the present invention aims to improve the workability of a slab while using a conventional formwork as the bottom formwork of the slab. [Means for solving the problem]

[0007] The slab construction method described in claim 1 comprises a formwork installation process in which a temporary deck is erected on temporary support members that are detachably attached to adjacent steel beams and a conventional formwork is laid on the temporary deck, a slab construction process in which slab concrete is poured on the conventional formwork, and a removal process in which the temporary support members, the temporary deck, and the conventional formwork are removed after the slab concrete has hardened.

[0008] According to the slab construction method of claim 1, in the formwork temporary installation step, a temporary deck is erected on temporary support members detachably attached to adjacent steel beams, and a conventional formwork is laid on the temporary deck. Next, in the slab construction step, slab concrete is poured on the conventional formwork. Next, in the removal step, after the slab concrete has hardened, the temporary support members, temporary deck, and conventional formwork are removed. As a result, the underside of the slab is finished in exposed concrete, improving the design of the underside.

[0009] In addition, by supporting the conventional formwork with a temporary deck erected on the temporary support members of the adjacent steel beams, it is possible to omit the shoring that supports the conventional formwork. Therefore, in the present invention, since the temporary construction and removal of the shoring is not required, the workability of the slab is improved.

[0010] In this way, the present invention can improve the workability of the slab while using a conventional formwork as the bottom formwork for the slab.

[0011] In addition, in the present invention, the conventional formwork can be temporarily installed in a shorter time than when the conventional formwork is supported by shoring. Therefore, for example, slab reinforcement can be arranged on the conventional formwork in a shorter time, which further improves the workability of the slab.

[0012] Furthermore, by eliminating the need for shoring, other construction work can be carried out earlier on the floor below the slab.

[0013] The slab construction method described in claim 2 is the slab construction method described in claim 1, in which the steel beam is embedded in the beam concrete, and the temporary support member is provided on the steel beam and is removably attached to a mounting member that constitutes the side formwork of the beam concrete.

[0014] According to the slab construction method of claim 2, the steel beam is embedded in the concrete beam. The steel beam is provided with a mounting member that constitutes a side formwork for the concrete beam. The temporary support member is detachably attached to the mounting member.

[0015] In this way, the workability of the beam concrete is improved by using the mounting member to which the temporary support member is attached as the side formwork of the beam concrete. In addition, the workability of the beam concrete is further improved because the mounting member can be used as a reference to temporarily set up other forms for the beam concrete.

[0016] The slab construction method as described in claim 3 is the slab construction method as described in claim 2, wherein the temporary support member has a support surface on which an end of the temporary deck is placed, and the mounting member has an opposing surface that faces the end of the temporary deck placed on the support surface of the temporary deck.

[0017] According to the slab construction method of claim 3, the temporary support member has a support surface on which the end of the temporary deck is placed. The mounting member has an opposing surface that faces the end of the temporary deck placed on the support surface of the temporary support member. This opposing surface of the mounting member suppresses positional deviation of the end of the temporary deck placed on the support surface of the temporary support member. This improves the workability and stability of the temporary deck.

[0018] The beam member described in claim 4 comprises a steel beam, a support member provided on the steel beam, a mounting member having a through hole and attached to the support member, and a nut attached to the back surface of the mounting member so as to communicate with the through hole.

[0019] According to the beam member of claim 4, a support member is provided on a steel beam. A mounting member having a through hole is attached to the support member. A nut is attached to the back surface of the mounting member so as to communicate with the through hole.

[0020] Here, a bolt can be screwed into the nut through a through hole in the mounting member. For example, a temporary support member for supporting a temporary deck and a conventional formwork can be detachably attached to the surface of the mounting member by the bolt. This allows the underside of the slab to be finished in exposed concrete, improving the design of the underside.

[0021] In addition, by supporting the conventional formwork with a temporary deck erected on the temporary support members of the adjacent beam members, it is possible to omit the shoring that supports the conventional formwork. Therefore, in the present invention, since the temporary construction and removal of the shoring is not required, the workability of the slab is improved.

[0022] In this way, the present invention can improve the workability of the slab while using a conventional formwork as the bottom formwork for the slab. Effect of the Invention

[0023] As described above, according to the present invention, it is possible to improve the workability of a slab while using a conventional formwork as the bottom formwork of the slab. [Brief description of the drawings]

[0024] [Figure 1] 1 is a cross-sectional view showing a structure including a slab constructed by a slab construction method according to one embodiment. [Diagram 2] 2 is a cross-sectional view corresponding to FIG. 1 showing the construction process of a concrete girder, a concrete sub-girder, and a slab. FIG. [Diagram 3] 2 is a cross-sectional view corresponding to FIG. 1 showing the construction process of a concrete girder, a concrete sub-girder, and a slab. FIG. [Figure 4]2 is a cross-sectional view corresponding to FIG. 1 showing the construction process of a concrete girder, a concrete sub-girder, and a slab. FIG. [Diagram 5] 2 is a cross-sectional view corresponding to FIG. 1 showing the construction process of a concrete girder, a concrete sub-girder, and a slab. FIG. [Figure 6] 2 is a cross-sectional view corresponding to FIG. 1 showing the construction process of a concrete girder, a concrete sub-girder, and a slab. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, one embodiment will be described with reference to the drawings.

[0026] (structure) 1 shows a predetermined floor of a structure (building) 10 equipped with a slab 80 constructed by the slab construction method of this embodiment. The structure 10 is, for example, configured with multiple floors. The predetermined floor of this structure 10 is equipped with a concrete girder 20, a concrete minor beam 50, and the slab 80. The concrete girder 20 and the concrete minor beam 50 are examples of concrete beams and beam members.

[0027] (Concrete beam) The concrete girder 20 is made of steel-reinforced concrete and is erected on a pair of columns (not shown). The concrete girder 20 has a concrete beam 22, a plurality of beam main reinforcements 24, a plurality of shear reinforcements 26, and an internal steel beam 30. The internal steel beam 30 is an example of a steel beam.

[0028] The concrete beam 22 is formed with a rectangular cross section. A plurality of main beam reinforcements 24 and a plurality of shear reinforcements 26 are embedded in the outer periphery of the concrete beam 22. The plurality of main beam reinforcements 24 are arranged along the material axis direction of the concrete girder 20. These main beam reinforcements 24 are surrounded by a plurality of shear reinforcements 26. The plurality of shear reinforcements 26 are arranged at intervals in the material axis direction of the concrete girder 20.

[0029] An internal steel beam 30 is embedded in the center of the beam concrete 22. The internal steel beam 30 is formed of an H-shaped steel. The internal steel beam 30 has an upper flange portion 30A and a lower flange portion 30B that face each other in the vertical direction, and a web portion 30C that connects the upper flange portion 30A and the lower flange portion 30B.

[0030] A plurality of gusset plates 32 are provided on the web portion 30C of the internal steel beam 30. The plurality of gusset plates 32 are formed from steel plates or the like, and are arranged at intervals in the material axis direction of the internal steel beam 30. Each gusset plate 32 extends from the internal steel beam 30 toward the concrete sub-beam 50 side.

[0031] More specifically, each gusset plate 32 extends diagonally upward (to the side and above the internal steel beam 30) from the upper part of the surface of the web portion 30C of the internal steel beam 30, with its upper end located above the upper flange portion 30A.

[0032] The upper end of the gusset plate 32 is not limited to being located above the upper flange portion 30A, but may be at the same height as the upper flange portion 30A, or may be located below the upper flange portion 30A. The gusset plate 32 is also not limited to being located on the web portion 30C of the internal steel beam 30, but may be located on, for example, the upper flange portion 30A or the lower flange portion 30B of the internal steel beam 30. Furthermore, the gusset plate 32 is an example of a support member.

[0033] A mounting member 40 is suspended across the tip portions of the multiple gusset plates 32. The mounting member 40 serves as a metal fitting to which a temporary support member 90 (described later) is detachably attached during construction of the slab 80, and also functions as a side formwork (steel side formwork) for the concrete girder 20.

[0034] The mounting member 40 is formed of, for example, a flat bar (flat steel plate). The longitudinal direction of the mounting member 40 is the material axis direction of the concrete girder 20, and the mounting member 40 is disposed along the side surface 20S of the concrete girder 20 facing the concrete sub-beam 50. The upper end of the mounting member 40 is embedded in the slab 80.

[0035] The mounting member 40 is not limited to a flat bar, and may be formed of, for example, an L-shaped steel, a T-shaped steel, a C-shaped steel, or the like.

[0036] A plurality of through holes 42 are formed in the mounting member 40. The plurality of through holes 42 are arranged at intervals in the longitudinal direction of the mounting member 40. Each of the through holes 42 is a circular hole that penetrates the mounting member 40 in the thickness direction.

[0037] A plurality of embedded nuts (high nuts) 44 are attached to the back surface (surface facing the concrete girder 20) of the mounting member 40. The plurality of embedded nuts 44 are joined to the back surface of the mounting member 40 by welding or the like so as to communicate with the plurality of through holes 42, respectively. The plurality of embedded nuts 44 are embedded in the beam concrete 22. The embedded nuts 44 are an example of a nut.

[0038] (Concrete beam) The concrete beam 50 is made of reinforced concrete and is installed on a pair of concrete girders (not shown). The concrete beam 50 has a concrete beam 52, a plurality of beam reinforcements 54, a plurality of shear reinforcements 56, and a temporary steel beam 60. The temporary steel beam 60 is an example of a steel beam.

[0039] The beam concrete 52 is formed with a rectangular cross section. A plurality of beam main reinforcements 54 and a plurality of shear reinforcements 56 are embedded in the outer periphery of the beam concrete 52. The plurality of beam main reinforcements 54 are arranged along the material axis direction of the concrete sub-beam 50. These beam main reinforcements 54 are surrounded by a plurality of shear reinforcements 56. The plurality of shear reinforcements 56 are arranged at intervals in the material axis direction of the concrete sub-beam 50.

[0040] A temporary steel beam 60 is buried in the center of the concrete beam 52. The temporary steel beam 60 is a temporary steel beam buried in the concrete beam 52 to support a mounting member 70 (described later). Therefore, the concrete beam 50 is made of reinforced concrete, not steel reinforced concrete.

[0041] The temporary steel beam 60 is not limited to being temporary, but may be permanent. In this case, the concrete beam 50 is made of steel reinforced concrete.

[0042] The temporary steel beam 60 is formed of an H-shaped steel. The temporary steel beam 60 has an upper flange portion 60A and a lower flange portion 60B that face each other in the vertical direction, and a web portion 60C that connects the upper flange portion 60A and the lower flange portion 60B.

[0043] A plurality of gusset plates 62 are provided on the web portion 60C of the temporary steel beam 60. The plurality of gusset plates 62 are formed from steel plates or the like, and are arranged at intervals in the material axis direction of the temporary steel beam 60. Each gusset plate 62 extends from the temporary steel beam 60 toward the concrete beam 20.

[0044] More specifically, each gusset plate 62 extends diagonally upward (to the side and above the temporary steel beam 60) from the upper part of the surface of the web portion 60C of the temporary steel beam 60, with the upper end portion positioned above the upper flange portion 60A.

[0045] The upper end of the gusset plate 62 is not limited to being located above the upper flange portion 60A, but may be at the same height as the upper flange portion 60A, or may be located below the upper flange portion 60A. The gusset plate 62 is also not limited to being provided on the web portion 60C of the temporary steel beam 60, but may be provided on, for example, the upper flange portion 60A or the lower flange portion 60B of the temporary steel beam 60. Furthermore, the gusset plate 62 is an example of a support member.

[0046] A mounting member 70 is hung across the tips of the multiple gusset plates 62. The mounting member 70, like the mounting member 40 of the concrete girder 20, serves as a metal fitting to which a temporary support member 90 (described later) is detachably attached during construction of the slab 80, and also functions as a side formwork (steel side formwork) for the concrete sub-beam 50.

[0047] The mounting member 70 is formed of, for example, a flat bar (flat steel plate). The mounting member 70 is arranged along the material axis direction of the concrete beam 50, and along the side surface 50S of the concrete beam 50 facing the concrete girder 20. The upper end of the mounting member 70 is embedded in the slab 80.

[0048] The mounting member 70 is not limited to a flat bar, and may be formed of, for example, an L-shaped steel, a T-shaped steel, a C-shaped steel, or the like.

[0049] A plurality of through holes 72 are formed in the mounting member 70. The plurality of through holes 72 are arranged at intervals in the longitudinal direction of the mounting member 70. Each of the through holes 72 is a circular hole that penetrates the mounting member 70 in the thickness direction.

[0050] A plurality of embedded nuts (high nuts) 74 are attached to the back surface (surface on the concrete joist 50 side) of the mounting member 70. The plurality of embedded nuts 74 are joined to the back surface of the mounting member 70 by welding or the like so as to respectively communicate with the plurality of through holes 72. The plurality of embedded nuts 74 are embedded in the beam concrete 52. The embedded nuts 74 are an example of a nut.

[0051] (Slab) The slab 80 is made of reinforced concrete and is erected on the concrete girders 20 and the concrete girders 50. The slab 80 has slab concrete 82 and a plurality of slab reinforcements 84 embedded in the slab concrete 82. The plurality of slab reinforcements 84 are arranged in a lattice pattern in plan view.

[0052] A lower surface 80L of the slab 80 (slab concrete 82) is formed by a conventional formwork 102 (see FIG. 4) described later, and has an exposed concrete finish.

[0053] (Slab construction method) Next, an example of a slab construction method according to this embodiment will be described.

[0054] (Steel beam installation process) First, as shown in Figures 2 and 3, in the steel beam installation process, the internal steel beam 30 of the main concrete girder 20 is installed, and the temporary steel beam 60 of the sub-concrete girder 50 is installed. Then, the surfaces of the mounting members 40, 70 of the internal steel beam 30 and the temporary steel beam 60 are made to face each other. In addition, temporary support members 90 are detachably attached to the surfaces of the mounting members 40, 70 by bolts 94.

[0055] Here, the configuration of the temporary receiving member 90 will be described. Note that the configurations of the temporary receiving member 90 attached to the mounting members 40 and 70 are the same. Therefore, hereinafter, the configuration of the temporary receiving member 90 attached to the mounting member 40 will be described, and a description of the configuration of the temporary receiving member 90 attached to the mounting member 70 will be omitted.

[0056] The temporary support member 90 is a temporary member that supports a temporary deck 100 and a conventional formwork 102, which will be described later. The temporary support member 90 is formed of an L-shaped steel (angle steel). The temporary support member 90 has a base portion 90A and a temporary support portion 90B.

[0057] The base portion 90A is placed on the surface of the mounting member 40. A plurality of through holes 92 are formed in the base portion 90A. The plurality of through holes 92 are arranged at intervals in the longitudinal direction of the base portion 90A.

[0058] The multiple through holes 92 are circular holes that penetrate the base portion 90A in the thickness direction, and each communicates with the multiple through holes 42 of the mounting member 40. The temporary receiving member 90 is attached to the surface of the mounting member 40 by screwing bolts 94 into the embedded nuts 44 through these through holes 42, 92.

[0059] The temporary support portion 90B protrudes from the upper end of the base portion 90A to the side of the concrete girder 20, i.e., toward the temporary steel beam 60 (concrete beam 50) side. The upper surface of the temporary support portion 90B serves as a support surface 90B1 on which a longitudinal end portion 100E of a temporary deck 100 (described later) is placed.

[0060] In this embodiment, the gusset plates 32, 62 and the mounting members 40, 70 are attached to the internal steel beam 30 and the temporary steel sub-girder 60 in a factory, a site yard, etc. However, the gusset plates 32, 62 and the mounting members 40, 70 may be attached to the internal steel beam 30 and the temporary steel sub-girder 60 after the internal steel beam 30 and the temporary steel sub-girder 60 are installed.

[0061] In this embodiment, after the interior steel beam 30 and the temporary steel sub-beam 60 are installed, the temporary support members 90 are attached to the mounting members 40, 70, respectively. However, the temporary support members 90 may be attached to the mounting members 40, 70 in a factory, a site yard, or the like.

[0062] Furthermore, the temporary support member 90 is not limited to an L-shaped steel, and may be formed of, for example, a T-shaped steel or a C-shaped steel.

[0063] (Temporary formwork construction process) Next, as shown in Figure 4, in the formwork construction process, a temporary deck 100 is erected on temporary support members 90 that are detachably attached to adjacent internal steel beams 30 and temporary steel sub-girders 60, and a conventional formwork 102 is laid on the temporary deck 100.

[0064] The temporary deck 100 is used as a support beam to support a conventional formwork 102 during construction of the slab 80. A flat deck or a deck plate, for example, is used for the temporary deck 100. A plurality of temporary decks 100 are erected in a floor-like manner on the temporary support members 90 of the adjacent interior steel beams 30 and temporary steel beams 60.

[0065] The end portions 100E on both longitudinal sides of the temporary deck 100 are placed on the placement surfaces 90B1 of the temporary receiving portions 90B of the temporary receiving members 90, and face the opposing surfaces 40A, 70A of the mounting members 40, 70, respectively. The opposing surfaces 40A, 70A of the mounting members 40, 70 suppress positional deviations of the end portions 100E on both longitudinal sides of the temporary deck 100.

[0066] The conventional formwork 102 is a wooden bottom formwork for the slab 80. The conventional formwork 102 is formed, for example, from plywood or the like. A plurality of the conventional formwork 102 are laid like a floor on the temporary deck 100 between the opposing faces 40A, 70A of the opposing mounting members 40, 70. The conventional formwork 102 is also arranged across the temporary support members 90 of the adjacent interior steel beams 30 and temporary steel beams 60.

[0067] (Slab construction process) Next, as shown in Fig. 5, in the slab construction process, slab reinforcement 84 is arranged in the conventional formwork 102. In this embodiment, the main beam reinforcement 24 and the shear reinforcement 26 are arranged around the interior steel beam 30, and the main beam reinforcement 54 and the shear reinforcement 56 are arranged around the temporary steel beam 60. Furthermore, conventional beam formwork 28, 58 for the concrete main beam 20 and the concrete sub-beam 50 are temporarily installed. At this time, the conventional beam formwork 28, 58 is temporarily installed based on the mounting members 40, 70.

[0068] In this manner, in this embodiment, the work of arranging the slab reinforcement 84 of the slab 80, the work of arranging the main beam reinforcement 24 and shear reinforcement 26 of the concrete girder 20, the work of arranging the main beam reinforcement 54 and shear reinforcement 56 of the concrete minor beam 50, and the temporary construction of the conventional beam formwork 28, 58 of the concrete girder 20 and the concrete minor beam 50 are all carried out in parallel.

[0069] In addition, the reinforcement work of the slab reinforcement 84 of the slab 80, the reinforcement work of the main beam reinforcement 24 and shear reinforcement 26 of the concrete girder 20, and the temporary construction work of the conventional beam formwork 28, 58 of the concrete girder 20 and the concrete minor beam 50 do not necessarily have to be carried out in parallel, and the order of work, etc. can be changed as appropriate.

[0070] 6, the slab concrete 82 is poured onto the conventional formwork 102. At this time, the beam concrete 22, 52 is also poured into the conventional beam formworks 28, 58 of the concrete girder 20 and the concrete beam 50.

[0071] (Removal process) Next, as shown in FIG. 1, in the removal process, after the slab concrete 82 and the beam concrete 22, 52 have hardened, the temporary support member 90, the temporary deck 100, and the conventional formwork 102 are removed.

[0072] Specifically, first, the conventional beam formwork 28, 58 of the concrete girder 20 and the concrete sub-beam 50 are demolded and removed, respectively. As a result, the side surfaces 20S, 50S and the bottom surfaces 20L, 50L of the concrete girder 20 and the concrete sub-beam 50 are finished in exposed concrete.

[0073] Next, the temporary support members 90 are removed from the mounting members 40, 70 of the concrete girder 20 and the concrete beam 50, respectively, and the temporary support members 90 and the temporary deck 100 erected on these temporary support members 90 are removed. Next, the conventional formwork 102 attached to the underside 80L of the slab 80 is removed. As a result, the underside 80L of the slab 80 is finished in exposed concrete.

[0074] (Action and Effects) Next, the operation and effects of this embodiment will be described.

[0075] As described above, according to this embodiment, in the formwork construction process, a temporary deck 100 is erected on temporary support members 90 that are detachably attached to adjacent internal steel beams 30 and temporary steel sub-girders 60, and a conventional formwork 102 is laid on the temporary deck 100.

[0076] Next, in a slab construction process, slab concrete 82 is poured onto the conventional formwork 102. Next, in a removal process, after the slab concrete 82 hardens, the temporary support member 90, the temporary deck 100, and the conventional formwork 102 are removed. As a result, the underside 80L of the slab 80 is finished in exposed concrete, improving the design of the underside 80L.

[0077] In addition, by supporting the conventional formwork 102 with the temporary deck 100 erected on the temporary support members 90 of the adjacent interior steel beams 30 and temporary steel beams 60, it is possible to omit shoring for supporting the conventional formwork 102. Therefore, in this embodiment, since temporary construction and removal of shoring is not required, the workability of the slab 80 is improved.

[0078] In this manner, in this embodiment, while using the conventional formwork 102 as the bottom formwork for the slab 80, the workability of the slab 80 can be improved.

[0079] In addition, in this embodiment, the conventional formwork 102 can be temporarily installed at an earlier stage than when the conventional formwork 102 is supported by shoring. Therefore, for example, the arrangement of the slab reinforcement bars 84 on the conventional formwork 102 can be performed at an earlier stage, further improving the workability of the slab 80.

[0080] Furthermore, by eliminating the need for shoring, other construction work can be carried out earlier on the floor below the slab 80.

[0081] Also, for example, the conventional support beams are erected on the conventional beam formwork 28, 58 of the concrete main beam 20 and the concrete minor beam 50. Therefore, after the temporary construction of the conventional beam formwork 28, 58, the conventional formwork 102 of the support beams and slab 80 is installed and the slab reinforcement 84 and the like are arranged, which may prolong the construction period.

[0082] In contrast, in this embodiment, as described above, the temporary deck 100 is erected on the temporary support members 90 of the adjacent interior steel beams 30 and temporary steel sub-beams 60. Therefore, the temporary installation work of the conventional beam formwork 28, 58 of the concrete main beam 20 and the concrete sub-beam 50 and the reinforcing work of the slab reinforcement 84 can be performed in parallel. Therefore, the construction period can be shortened.

[0083] In addition, when temporarily setting up the conventional beam formworks 28, 58, the conventional formwork 102 of the slab 80 can be used as a work floor, improving the workability of the conventional beam formworks 28, 58.

[0084] In addition, the temporary support member 90 is detachably attached to the mounting members 40, 70 constituting the side formwork of the concrete girder 20 and the concrete minor beam 50. By using the mounting members 40, 70 to which the temporary support member 90 is attached as the side formwork of the concrete girder 20 and the concrete minor beam 50 in this manner, the workability of the concrete girder 20 and the concrete minor beam 50 is improved.

[0085] Furthermore, since the conventional beam formwork 28, 58 for the concrete girder 20 and the concrete sub-beam 50 can be temporarily installed based on the mounting members 40, 70, the workability of the concrete girder 20 and the concrete sub-beam 50 is further improved.

[0086] Furthermore, the temporary support member 90 has a mounting surface 90B1 on which the end portion 100E of the temporary deck 100 is placed. The mounting members 40, 70 also have opposing surfaces 40A, 70A that face the end portion 100E of the temporary deck 100 placed on the mounting surface 90B1 of the temporary support member 90. These opposing surfaces 40A, 70A suppress misalignment of the end portion 100E of the temporary deck 100. Therefore, the workability and stability of the temporary deck 100 are improved.

[0087] (Modification) Next, a modification of the above embodiment will be described.

[0088] In the above embodiment, the opposing surfaces 40A, 70A are provided on the mounting members 40, 70. However, the opposing surfaces 40A, 70A of the mounting members 40, 70 may be provided as necessary and may be omitted as appropriate.

[0089] In the above embodiment, the mounting members 40 form the side formwork of the concrete girder 20. However, the mounting members 40 do not necessarily have to form the side formwork of the concrete girder 20, and the mounting members 40 may be provided separately from the side formwork of the concrete girder 20.

[0090] Similarly, in the above embodiment, the mounting member 70 constitutes the side formwork of the concrete joist 50. However, the mounting member 70 does not necessarily have to constitute the side formwork of the concrete joist 50, and the mounting member 70 may be provided separately from the side formwork of the concrete joist 50.

[0091] In the above embodiment, the temporary deck 100 is installed between adjacent concrete girders 20 and concrete sub-girders 50. However, the temporary deck may be installed, for example, between adjacent concrete girders 20 or between adjacent concrete sub-girders 50. In this case, the mounting members 40, 70 are appropriately provided on the internal steel beams 30 of the concrete girders 20 and the temporary steel sub-girders 60 of the concrete sub-girders 50.

[0092] In the above embodiment, the steel beams are the internal steel beams 30 of the concrete main beam 20 and the temporary steel sub-beams 60 of the concrete sub-beams 50. However, the steel beams are not limited to the internal steel beams 30 and the temporary steel sub-beams 60, and may be, for example, steel beams and steel sub-beams in a steel-framed structure.

[0093] In the above embodiment, the beam members are the concrete girder 20 and the concrete sub-girder 50. However, the beam members are not limited to the concrete girder 20 and the concrete sub-girder 50, and may be, for example, steel beams and steel sub-girders in a steel frame structure. In this case, the gusset plates 32, 62 and the mounting members 40, 70 are appropriately provided on the steel beams (including the steel sub-girders).

[0094] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it is of course possible to implement the present invention in various forms without departing from the gist of the present invention. [Explanation of symbols]

[0095] 20 Concrete girder (beam member) 20S side 22 Beam Concrete 30 Interior steel beam (steel beam) 32 Gusset plate (support member) 40 Mounting material 40A Opposite surface 42 Through hole 44 Embedded Nut (Nut) 50 Concrete beam (beam member) 50S side 52 Beam Concrete 60 Temporary steel beam (steel beam) 62 Gusset plate (support member) 70 Mounting material 70A Opposite Surface 72 Through hole 74 Embedded Nut (Nut) 80 Slab 82 Slab Concrete 84 Slab Reinforcement 90 Temporary support material 90B1 Placement surface 100 Temporary Deck 100E End 102 Conventional Formwork

Claims

1. A formwork temporary installation process of erecting a temporary deck on temporary support members detachably attached to adjacent steel beams and laying a conventional formwork on the temporary deck; A slab construction process of pouring slab concrete on the conventional formwork; a removal process of removing the temporary support member, the temporary deck, and the conventional formwork after the slab concrete has hardened; A method for constructing a slab comprising the steps of:

2. The steel beam is embedded in the beam concrete, The temporary support member is provided on the steel beam and is detachably attached to a mounting member constituting a side formwork of the beam concrete. A method for constructing a slab according to claim 1.

3. The temporary support member has a support surface on which an end portion of the temporary deck is placed, The mounting member has an opposing surface that faces an end of the temporary deck placed on the placement surface of the temporary deck. A method for constructing a slab according to claim 2.

4. Steel beams and A support member provided on the steel beam; a mounting member having a through hole and attached to the support member; A nut attached to a back surface of the mounting member so as to communicate with the through hole; A beam member comprising:

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