Slab construction method

Abstract

To provide a slab construction method capable of reducing the number of supports.SOLUTION: A slab construction method M includes: a first formwork installation step S1 of providing a first formwork 11 for constructing beams 4, 5; a laying step S2 of laying a laying member 30 at a portion of a pair of first formworks 11 opposing in a predetermined direction; a second formwork installation step S3 of placing a second formwork 12 for constructing a slab 6 at part of the first formwork 11 and the laying member 30; a concrete installation step S4 of placing concrete C in the first formwork 11 and the second formwork 12 and hardening the concrete C: and a formwork removal step S5 of removing the first formwork 11 after the concrete installation step S4.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a slab construction method (hereinafter referred to as "slab construction method"), and more specifically to a slab construction method for a building in which beams and columns are constructed using formwork for pouring concrete (hereinafter simply referred to as "formwork"). [Background technology]

[0002] When constructing slabs for buildings such as reinforced concrete or steel reinforced concrete, where beams and columns are constructed using formwork, multiple supports made of metal pipes and the like are installed under the formwork for the beams and under the formwork for the slab to support the weight of the pre-hardened concrete poured into the formwork (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-88348 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the shoring is no longer necessary once the concrete inside the formwork has hardened, it is removed after the concrete has hardened. Thus, at a construction site where beams are constructed using formwork, the work of installing and removing the shoring is necessary, and this work can be a burden on the site.

[0005] The present invention has been made in view of the above points, and one of its objects is to provide a slab construction method that can reduce the number of supports. [Means for solving the problem]

[0006] (1): The slab construction method of the present invention comprises a first formwork installation step of setting up a first formwork for constructing a beam; an erection step of suspending an erection member between a pair of portions of the first formwork facing each other in a predetermined direction; a second formwork installation step of placing a second formwork for constructing a slab on a portion of the first formwork and the erection member; a concrete installation step of pouring concrete into the first formwork and the second formwork and hardening the concrete; and a formwork removal step of removing the first formwork after the concrete installation step.

[0007] (2): In the slab construction method of (1), the erection member may include a top portion on which the second formwork can be placed, and a protrusion protruding from the top portion.

[0008] (3): In the slab construction method of (2), the portion of the erection member placed on the first formwork may be a part of the top portion.

[0009] (4): In any of the slab construction methods (1) to (3), the erection member may be a deck plate.

[0010] (5): In any of the slab construction methods (1) to (4), the erection members may further be removed in the formwork removal step.

[0011] (6): In any of the slab construction methods (1) to (5), the second formwork may be a deck plate.

[0012] (7): In the slab construction method of (6), the second formwork may be a deck plate having a shape in which peaks and valleys are formed alternately.

[0013] (8): In the slab construction method of (7), the predetermined direction may be a direction perpendicular to the direction in which the peaks and valleys are aligned.

[0014] (9): In the slab construction method of (7), the predetermined direction may be a direction parallel to the direction in which the peaks and valleys are aligned. [Effects of the Invention]

[0015] According to the present invention, a slab construction method is provided that can reduce the number of supports. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a diagram showing a schematic view of a part of a building constructed using the slab construction method according to the present invention; [Figure 2] FIG. 2 is a diagram schematically illustrating a part of a cross section taken along line AA in FIG. [Figure 3] 1 is a flowchart illustrating a slab construction method according to the present invention. [Figure 4] 4 is a diagram showing the first formwork installation step, the erection step, and the second formwork installation step shown in FIG. 3. FIG. [Figure 5] FIG. 4 is a diagram schematically showing a state after the installation step shown in FIG. 3. [Figure 6] 4 is a diagram showing the state after the concrete placing step shown in FIG. 3, and is a diagram showing a part of the cross section along line BB after concrete has been poured into the formwork shown in FIG. [Figure 7] 4 is a diagram showing the state after the concrete placing step shown in FIG. 3, and is a diagram showing a part of the cross section along line CC after concrete has been poured into the formwork shown in FIG. [Figure 8] 1A and 1B are diagrams showing a first modified example of an erection member, where (A) is a diagram showing a schematic view of the erection member according to the first modified example being used when looking in a first direction, and (B) is a diagram showing a schematic view of the erection member according to the first modified example being used when looking in a second direction. [Figure 9] FIG. 10 is a diagram showing a second modified example of the installation member, and is a diagram showing a schematic view of a part of the state in which the installation member according to the second modified example is used, looking in the first direction. [Figure 10]FIG. 10 is a diagram showing a third modified example of the installation member, and is a diagram showing a schematic view of a part of the state in which the installation member according to the third modified example is used, looking in the first direction. [Figure 11] 10A and 10B are diagrams illustrating examples in which the installation members are installed in different directions. DETAILED DESCRIPTION OF THE INVENTION

[0017] Below, embodiments for carrying out the slab construction method according to the present invention are illustrated with reference to the accompanying drawings. The embodiments illustrated below are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention can be modified or improved from the following embodiments without departing from the spirit of the present invention. In addition, in the accompanying drawings, the dimensions of each component may be exaggerated or reduced, and hatching may be omitted, in order to facilitate understanding.

[0018] FIG. 1 is a diagram schematically illustrating a portion of a building 1 constructed using a slab construction method according to an embodiment. As shown in FIG. 1, the building 1 includes a plurality of columns 2 extending in a vertical direction Z, a plurality of beams 4 extending in a first direction X intersecting the vertical direction Z (orthogonal in this embodiment), and a plurality of beams 5 extending in a second direction Y intersecting both the vertical direction Z and the first direction X (orthogonal in this embodiment). The columns 2, beams 4, and beams 5 intersect with each other to form a framework for the building 1. More specifically, the beams 4 and 5 form a floor framework for the building 1. A slab 6 is supported by the floor framework constructed on the beams 4 and 5. The slab 6 may be a floor slab or a roof slab. FIG. 1 illustrates an example in which the slab 6 is a floor slab.

[0019] FIG. 2 is a diagram schematically illustrating a portion of the cross section taken along line AA in FIG. 1. As shown in FIG. 2, the slab 6 includes concrete C and reinforcing bars 7 embedded in the concrete C. Of the concrete C, concrete C1 forming the slab 6 is poured and cured on a deck plate 10 serving as a formwork (second formwork 12). The deck plate 10 may be a deck plate that functions solely as a formwork, or may be a deck plate that is integrated with the concrete C1. In this embodiment, the deck plate 10 is integrated with the concrete C1, and the slab 6 is formed as a so-called composite deck slab. Note that the second formwork 12 that serves as the formwork for the concrete C1 is not limited to a deck plate.

[0020] As shown in FIG. 2, the beams 4 and 5 include concrete C and reinforcing bars 8 embedded in the concrete C. In FIG. 2, only the cross section of the beam 5 is shown. Of the concrete C, concrete C2 forming the beams 4 and 5 is poured into a formwork (first formwork) and cured. The formwork for pouring the concrete C2 is indicated by reference numeral 11 in FIGS. 4 to 7, which will be described later. Although not shown in the figures, the column 2 also includes concrete C and reinforcing bars 8 embedded in the concrete C, and the concrete C forming the column 2 is poured into a formwork and cured.

[0021] In this way, the building 1 is a building in which beams and columns are constructed using formwork, and may be a so-called reinforced concrete or steel reinforced concrete building.

[0022] The slab 6 of the building 1 is specifically constructed as follows: That is, a slab construction method according to this embodiment will be described below.

[0023] Fig. 3 is a flowchart showing a slab construction method M according to this embodiment. As shown in Fig. 3, the slab construction method M includes a first formwork installation step S1, an erection step S2 performed after the first formwork installation step S1, a second formwork installation step S3 performed after the erection step S2, a concrete installation step S4 performed after the second formwork installation step S3, and a formwork removal step S5 performed after the concrete installation step S4. Fig. 4 is a diagram showing the first formwork installation step S1, the erection step S2, and the second formwork installation step S3. Fig. 5 is a diagram showing a schematic view of the state after the erection step S2.

[0024] (First formwork installation process S1) In this process, first, a plurality of reinforcing bars are arranged to form the reinforcing bars 8 to be embedded in the column 2 and the beams 4 and 5. Specifically, the reinforcing bars 8 to be embedded in the column 2 are assembled and extended upward to the required location, and then, after the extension is completed, the reinforcing bars 8 are enclosed in a first formwork 11. The reinforcing bars 8 to be embedded in the beams 4 and 5 are assembled at a different location to have a shape and dimensions that allow the beam to be constructed, and then placed (moved) into the first formwork 11 that has been constructed in advance, as shown in FIG. 4. In this manner, the first formwork 11 includes a plurality of first portions 11A surrounding the reinforcing bars 8 that form the beam 4, a plurality of second portions 11B surrounding the reinforcing bars 8 that form the beam 5, and a plurality of third portions 11C surrounding the reinforcing bars 8 that form the column 2. The plurality of first portions 11A extend in the first direction X and include a pair of first portions 11A, 11A that face each other in the second direction Y. The multiple second portions 11B extend in the second direction Y and include a pair of second portions 11B, 11B facing each other in the first direction X. For convenience, the reinforcing bars 8 are not shown in Figure 4. For convenience, Figure 4 also shows the portion of the first formwork 11 where a roof slab is to be constructed. However, it goes without saying that the slab construction method M can be applied to both roof slabs and floor slabs.

[0025] In the example shown in Fig. 4, a formwork for constructing a slab is formed in a grid pattern by the first portion 11A and the second portion 11B, and the formwork includes four rectangular regions S1, S2, S3, and S4 surrounded by the first portion 11A and the second portion 11B. In this embodiment, the length in the first direction X of each of the regions S1, S2, S3, and S4 is shorter than the length in the second direction Y. In Fig. 4, the regions S3 and S4 are in a state immediately after this step (the first formwork installation step S1) has been performed, the region S2 is in a state immediately after the erection step S2 has been performed, and the region S1 is in a state immediately after the second formwork installation step S3 has been performed.

[0026] After setting up the first formwork 11 for constructing the beams 4 and 5, as shown in Figure 5, a support 20 made of, for example, a metal pipe member or the like may be set up on the bottom surface of the first part 11A and the second part 11B of the first formwork 11 for forming the beams 4 and 5 to support the first part 11A and the second part 11B of the first formwork 11.

[0027] (Erection process S2) This process is carried out after the first formwork installation process S1. This process is a process of bridging an installation member 30 across a pair of first formwork 11 portions that face each other in a predetermined direction. As shown in area S2 of FIG. 4 and FIG. 5, in this embodiment, the installation member 30 is bridging a pair of second portions 11B, 11B of the first formwork 11 that face each other in the first direction. That is, in this embodiment, the first direction X is the predetermined direction. The installation member 30 is a plate-like member that is rectangular when viewed from the vertical direction Z, and may be, for example, a metal plate-like member.

[0028] In this embodiment, the installation member 30 is a deck plate. More specifically, as shown in FIG. 5 , the installation member 30 is a deck plate (so-called flat deck) including a top portion 31, which is a flat plate-like portion, and a protruding portion 32 protruding from the top portion 31. The protruding portion 32 protrudes downward in the vertical direction Z and extends parallel to the longitudinal direction of the installation member 30. In the longitudinal direction of the installation member 30, both ends of the protruding portion 32 are end-closed portions 32A that are end-closed toward the top portion 31. In the longitudinal direction of the installation member 30, a connection portion 33 between the end-closed portion 32A and the installation member 31 is located inside both ends of the top portion 31. That is, in the longitudinal direction of the installation member 30, the top portion 31 includes an outer edge portion 31A that is formed flat and outside the end-closed portion 32A. In this embodiment, the installation member 30 is installed across the first formwork 11 so that the longitudinal direction of the installation member 30 is parallel to the first direction X. Specifically, in the first direction X, the outer edge portion 31A on one side is placed on one of the second parts 11B, 11B of the pair of second parts 11B, 11B, and the outer edge portion 31A on the other side is placed on the other of the second parts 11B, 11B of the pair of second parts 11B, 11B, thereby bridging the erection member 30 across the parts of a pair of first formworks 11 that face each other in the first direction X.

[0029] As described above, in this embodiment, the portion of the installation member 30 that is placed on the first formwork 11 is a part of the top portion 31. Therefore, even if the installation member 30 includes the protruding portion 32, by placing the outer edge portion 31A on the first formwork 11 as shown in Fig. 5, it is possible to place the installation member 30 so that the protruding portion 32 does not interfere with the first formwork 11, and this makes it possible to span the installation member 30 in the horizontal direction.

[0030] In this embodiment, two installation members 30 are placed so that each of the regions S1, S2, S3, and S4 is divided into approximately three equal parts in the second direction Y. However, the number and arrangement of the installation members 30 are not limited to this. For example, one installation member 30 may be placed so that each of the regions S1, S2, S3, and S4 is divided into approximately two equal parts in the second direction Y, three installation members 30 may be placed so that each of the regions S1, S2, S3, and S4 is divided into four equal parts, or (N-1) installation members 30 may be placed so that each of the regions S1, S2, S3, and S4 is divided into N equal parts (N is a natural number greater than or equal to 2). Furthermore, it is not necessary to place the installation members 30 so that each of the regions S1, S2, S3, and S4 is divided into equal parts.

[0031] (Second formwork installation process S3) This process is carried out after the erection process S2. This process involves placing a second formwork 12 for constructing a slab on a portion of the first formwork 11 and the erection members 30. Specifically, in this embodiment, in each of the regions S1, S2, S3, and S4, the second formwork 12 is placed on a pair of second portions 11B, 11B of the first formwork 11 and on the top portions 31 of the two erection members 30, 30. As described above, the top portions 31 are flat plate-like portions, and therefore the second formwork 12 (deck plate 10) can be placed on them.

[0032] Here, FIG. 6 is a diagram showing the state after the concrete placing step S4, and is a diagram that schematically shows a part of the cross section along line BB after concrete C has been poured into the formwork shown in FIG. 4.

[0033] As shown in FIGS. 4 and 6, in this embodiment, the second formwork 12 is a deck plate 10. More specifically, the second formwork 12 is a deck plate 10 in which peaks 13 and valleys 14 are alternately formed in the second direction Y. That is, the peaks 13 and valleys 14 are aligned in the second direction Y. Each of the peaks 13 and valleys 14 extends in the first direction X. In this step, in the first direction X, one end of the deck plate 10 and its vicinity are placed on one of the pair of second portions 11B, 11B, and the other end and its vicinity are placed on the other of the pair of second portions 11B, 11B. As a result, the deck plate 10, which is the second formwork 12, is placed on the pair of second portions 11B, 11B of the first formwork 11 and the two erection members 30, 30. As described above, the first direction X, which is the predetermined direction in this embodiment, is a direction perpendicular to the second direction Y, which is the direction in which the peaks 13 and the valleys 14 are aligned, and the installation member 30 is bridged parallel to the direction in which the peaks 13 and the valleys 14 extend.

[0034] (Concrete installation process S4) This step is carried out after the second formwork installation step S3. Fig. 7 is a diagram showing the state after this step, and is a diagram schematically showing a part of the cross section along line CC after concrete C has been poured into the formwork shown in Fig. 4.

[0035] In this process, first, as shown in Figures 6 and 7, reinforcing bars 7 are placed on deck plates 10 (second formwork 12) placed in each of areas S1, S2, S3, and S4. Next, concrete C is poured into the first formwork 11 and the second formwork 12, and the concrete C is allowed to harden. This completes the construction of the slab 6, beams 4 and 5, and columns 2.

[0036] (Formwork removal process S5) This process is carried out after the concrete setting process S4. Specifically, the first formwork 11, shoring 20, and erection members 30 are removed. As a result, the building 1 and the slab 6 of the building 1 shown in Figures 1 and 2 are constructed. Here, the erection members 30 are placed on the first formwork 11, and concrete C has not been poured onto the erection members 30. Therefore, when the first formwork 11 is removed, the erection members 30 can also be easily removed.

[0037] In this step, it is not essential to remove the installation member 30. If the installation member 30 is not removed, the effort of removing the installation member 30 can be saved, thereby improving workability.

[0038] As described above, the slab construction method M of this embodiment comprises a first formwork installation process S1 in which a first formwork 11 for constructing beams 4 and 5 is provided; an erection process S2 in which an erection member 30 is placed between a pair of first formwork 11 portions (second portions 11B, 11B) facing each other in a predetermined direction; a second formwork installation process S3 in which a second formwork 12 for constructing a slab 6 is placed between a portion of the first formwork 11 (a pair of second portions 11B, 11B) and the erection member 30; a concrete installation process S4 in which concrete C is poured into the first formwork 11 and the second formwork 12 and allowed to harden; and a formwork removal process S5 in which the first formwork 11 is removed after the concrete installation process S4.

[0039] According to this slab construction method M, erection members 30 are erected between beams, and the load of the pre-hardened concrete can be supported by these erection members 30, so it is possible to omit shoring that is installed in the area between the beams. In other words, according to the slab construction method M, it is possible to construct the slab 6 with a reduced number of shoring.

[0040] Furthermore, in this embodiment, the erection member 30 has a protrusion 32 that protrudes downward from the top 31. With this configuration, the cross-sectional performance of the erection member 30 is improved compared to when the erection member 30 has only the top 31. Therefore, the erection member 30 according to this embodiment can support a larger load, and the slab construction method M according to this embodiment makes it possible to further reduce the number of supports.

[0041] Although the present invention has been described above using the above-mentioned embodiment as an example, the present invention is not limited to this.

[0042] For example, in the above-described embodiment, an example was described in which the installation member 30 was a deck plate, but the installation member 30 is not limited to a deck plate. For example, an example of a modification of the installation member is modification 1 shown in FIG. 8. In FIG. 8, (A) is a diagram schematically showing an installation member 30A according to a first modification in use, viewed in the first direction X, and (B) is a diagram schematically showing the installation member 30A, viewed in the second direction Y. As shown in FIG. 8, the installation member 30A may be a member having a truss structure, and more specifically, may be a metal material having a truss structure formed by combining iron wires, reinforcing bars, etc. The installation member 30A extends in the first direction X and appears triangular when viewed from the first direction X. The erection member 30A includes, for example, a top portion 30Aa consisting of one iron wire or reinforcing bar extending in the first direction X, a convex portion 30Ab that protrudes obliquely downward from the top portion 30Aa to one side and the other side in the second direction Y when viewed from the first direction X, and a bottom portion 30Ac consisting of two iron wires or reinforcing bars extending in the first direction X.

[0043] As shown in FIG. 8(A), the top 30Aa can support the peaks 13 of the deck plate 10 (second formwork 12), which has peaks 13 and valleys 14. In the vertical direction Z, the height from the top 30Aa to the bottom 30Ac of the installation member 30A is approximately equal to the height from the peaks 13 to the valleys 14 of the deck plate 10. As shown in FIG. 8(B), the protrusions 30Ab are formed from multiple iron wires or reinforcing bars arranged to form a truss shape when viewed from the second direction Y. Each of the two iron wires or reinforcing bars forming the bottom 30Ac is connected to the lower ends of the multiple iron wires or reinforcing bars forming the protrusions 30Ab. When placing the installation member 30A, the bottom 30Ac may be placed on the first formwork 11.

[0044] Another example of a modified installation member is Modification 2 shown in FIG. 9 . FIG. 9 is a diagram schematically illustrating a portion of an installation member 30B according to Modification 2 in use, viewed in the first direction X. As shown in FIG. 9 , the installation member 30B may be formed, for example, from a single member that appears rectangular when viewed in the first direction X, or may be made of a metal material or a so-called square pipe. The installation member 30B includes a top portion 30Ba, a convex portion 30Bb, and a bottom portion 30Bc. The top portion 30Ba is a flat, plate-like portion extending horizontally. The convex portion 30Bb consists of two flat, plate-like portions protruding downward from both ends of the top portion 30Ba in the second direction Y. The bottom portion 30Bc is a flat, plate-like portion extending horizontally and connected to the lower ends of the two plate-like portions of the convex portion 30Bb.

[0045] The top 30Ba can support the peaks 13 of the deck plate 10 (second formwork 12), which has peaks 13 and valleys 14. In the vertical direction Z, the height from the top 30Ba to the bottom 30Bc of the installation member 30B is approximately equal to the height from the peaks 13 to the valleys 14 of the deck plate 10. When placing the installation member 30B, the bottom 30Bc may be placed on the first formwork 11.

[0046] Another example of a modification of the installation member is Modification 3 shown in FIG. 10 . FIG. 10 is a diagram schematically illustrating a portion of an installation member 30C according to Modification 3 being used, viewed in the first direction X. As shown in FIG. 10 , the installation member 30C may be, for example, an inverted-T-shaped member formed by joining a first member 30C1 that appears L-shaped when viewed from the first direction X and a second member 30C2 that appears in an inverted L-shape, or may be made of metal. The installation member 30C includes a top portion 30Ca, a protrusion 30Cb, and a bottom portion 30Cc. The top portion 30Ca is made up of the upper end surface of the first member 30C1 and the upper end surface of the second member 30C2, and extends horizontally. The convex portion 30Cb is a portion that protrudes downward from the top portion 30Ca and is made up of a portion that extends in the vertical direction Z of the first member 30C1 and a portion that extends in the vertical direction Z of the second member 30C2. The bottom portion 30Cc is a portion that extends from the lower end of the convex portion 30Cb to one side and the other side in the second direction Y. The bottom portion 30Cc is made up of a portion that extends in the horizontal direction of the first member 30C1 and a portion that extends in the horizontal direction of the second member 30C2.

[0047] The top 30Ca can support the peaks 13 of the deck plate 10 (second formwork 12), which has peaks 13 and valleys 14. In the vertical direction Z, the height from the top 30Ca to the bottom 30Cc of the installation member 30C is approximately equal to the height from the peaks 13 to the valleys 14 of the deck plate 10. When placing the installation member 30C, the bottom 30Cc may be placed on the first formwork 11.

[0048] In the above-described embodiment, an example has been described in which the installation member 30 is bridged across a pair of second portions 11B, 11B of the first formwork 11 that face each other in the first direction X. However, this is not limited to this. For example, the installation member 30 may be bridged as in Modification 4 shown in FIG. 11 . That is, FIG. 11 is a diagram showing Modification 4 in which the installation member 30 is erected in a different direction. As shown in FIG. 11 , in this modification, in each of the regions S1, S2, S3, and S4, one installation member 30 is bridged across a pair of first portions 11A, 11A of the first formwork 11 that face each other in the second direction Y. That is, the predetermined direction in this modification is a direction parallel to the second direction Y, which is the direction in which the peaks 13 and valleys 14 of the deck plate 10 (second formwork 12) are aligned. FIG. 11 shows an example in which one installation member 30 is disposed at the center in the first direction X of each of the regions S1, S2, S3, and S4.

[0049] By bridging the installation members 30 in a direction parallel to the direction in which the peaks 13 and valleys 14 of the deck plate 10 are aligned (i.e., the second direction Y) as in the fourth modified example, it is possible to more effectively suppress deflection of the deck plate 10. Therefore, according to the fourth modified example, it is possible to reduce the number of installation members 30 compared to the above-described embodiment. Meanwhile, in the above-described embodiment, since the overall length (length in the first direction X) of the installation members 30 according to the fourth modified example is shorter than the overall length (length in the second direction Y) of the installation members 30, the installation members 30 can be formed easily and at low cost.

[0050] Furthermore, in the above-described embodiment and each modified example, the second formwork 12 is a deck plate 10 (a so-called composite deck) having a shape in which peaks 13 and valleys 14 are alternately formed. However, the second formwork 12 may be other deck plates such as a flat deck. However, composite decks generally tend to be weaker than flat decks. Therefore, when a composite deck is used as the second formwork 12, the number of supports tends to increase. Therefore, by applying slab construction method M when a composite deck, which tends to require an increased number of supports, is used as the second formwork 12, it is possible to further reduce the number of supports. Note that the second formwork 12 does not have to be a deck plate.

[0051] In addition, those skilled in the art can appropriately modify the slab construction method of the present invention in accordance with conventionally known knowledge. As long as such modifications still provide the configuration of the present invention, they are of course included in the scope of the present invention. [Explanation of symbols]

[0052] 4, 5...Beam, 6...Slab, 10...Deck plate, 11...First formwork, 12...Second formwork, 13...Crest, 14...Valve, 30, 30A, 30B, 30C...Erection members, 30Aa, 30Ba, 30Ca, 31...Top, 30Ab, 30Bb, 30Cb, 32...Convex, C, C1, C2...Concrete.

Claims

1. a first formwork installation step of installing a first formwork for constructing a beam; an erection step of bridging an erection member between a pair of portions of the first formworks facing each other in a predetermined direction; a second formwork installation step of placing a second formwork for constructing a slab on a portion of the first formwork and the erection member; a concrete placing step of pouring concrete into the first formwork and the second formwork and hardening the concrete; a form removing step of removing the first form after the concrete placing step; A slab construction method comprising:

2. The slab construction method according to claim 1, wherein the erection member includes a top portion on which the second formwork can be placed and a protrusion protruding from the top portion.

3. The slab construction method according to claim 2, wherein the portion of the erection member placed on the first formwork is a part of the top portion.

4. The slab construction method according to any one of claims 1 to 3, wherein the erection member is a deck plate.

5. The slab construction method according to claim 1 , wherein the erection members are further removed in the formwork removing step.

6. The slab construction method according to any one of claims 1 to 3, wherein the second formwork is a deck plate.

7. 7. The slab construction method according to claim 6, wherein the second formwork is a deck plate having a shape in which peaks and valleys are formed alternately.

8. 8. The slab construction method according to claim 7, wherein the predetermined direction is a direction perpendicular to the direction in which the peaks and valleys are aligned.

9. 8. The slab construction method according to claim 7, wherein the predetermined direction is a direction parallel to the direction in which the peaks and valleys are aligned.

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