Support structure for timbering and construction method for slab

Abstract

To provide a support structure and the like for timbering allowing construction work for a slab to be carried out easily.SOLUTION: A construction method for a slab comprises steps of installing timbering 5 between a pair of side parts 2 and supporting the timbering 5 on side parts 2 when constructing the slab of a top plate by placing concrete on half-precast members 7 suspended and supported from / on the timbering 5 and the side parts 2. The timbering 5 is constructed between support parts 10 arranged on both of the side parts 2, and the support part 10 comprises: lower steel support members 11 fixed on upper surfaces of the side parts 2; and upper steel support members 12 placed on the lower support members 11 and detachably attached on the lower support members 11. Height of an upper end of the lower support member 11 is lower than a top end of the placed concrete.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a support structure for shoring and a method for constructing a slab using the same. [Background technology]

[0002] Traditionally, when constructing the concrete slab for the top of a box culvert or water treatment facility, shoring is placed closely on the underside of the bottom formwork when pouring the concrete to prevent deformation of the bottom formwork due to the load during construction.However, in order to streamline construction, concrete half-precast members are sometimes used as the bottom formwork to create an embedded formwork, and the top slab is constructed using half-precast members and cast-in-place concrete.

[0003] For example, Patent Document 1 describes that when constructing a box culvert, half-precast members are installed across a pair of wall bodies, and shoring is placed between the tops of the pair of wall bodies, and concrete is poured on top of the half-precast members suspended from the shoring to construct the top slab. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2023-167478 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, the support part (top) of the shoring is formed together with the wall body using concrete, but depending on the construction method and conditions, the support part may be formed separately from the wall body, in which case workability during construction becomes an issue.

[0006] For example, it is possible to use precast concrete blocks as the support sections, or to form the support sections from cast-in-place concrete, but in the former case, the heavy precast blocks would need to be lifted to the top of the wall using a crane or similar, while in the latter case, it would be time-consuming to assemble the formwork, etc. In particular, the top of the wall is where the top slab and the wall come together at the corner, and the formwork would need to be assembled in the midst of complex reinforcement arrangements.

[0007] On the other hand, even when steel is used as the support, the protruding part of the steel from the top of the top plate must be cut off, which is a time-consuming process. Furthermore, if the steel is exposed at the top of the top plate, the durability of that part may become an issue.

[0008] The present invention has been made in consideration of the above problems, and aims to provide a support structure for shoring that allows slab construction work to be easily carried out. [Means for solving the problem]

[0009] The first invention for solving the above-mentioned problem is a support structure for shoring that supports the shoring on top of a pair of side parts when a slab is constructed by erecting shoring between the pair of side parts and pouring concrete on top of a bottom formwork suspended from the shoring, wherein the shoring is erected between support parts provided on the pair of side parts, and the support parts have a steel lower support member fixed to the upper surface of the side parts, and a steel upper support member that is installed on top of the lower support member and removably relative to the lower support member, and the height of the upper end of the lower support member is lower than the top edge of the concrete to be poured.

[0010] In this invention, the bottom formwork is suspended and supported by shoring during slab construction. The support section supporting the shoring is divided into a lower support member and an upper support member, and the upper support member is installed detachably relative to the lower support member. These support members are made of steel and are made compact by dividing them into upper and lower parts, which reduces the weight of the members and eliminates the need to assemble formwork on the sides to form the support member. In addition, in this invention, the upper support member can be removed without cutting it by detaching it from the lower support member, and it can also be reused. As described above, this invention makes slab construction work easier. Furthermore, since the top end of the remaining lower support member is located lower than the top edge of the concrete, it prevents the steel from being exposed on the top surface of the slab.

[0011] The support section further includes a connecting jig that is removably installed on the lower support between the lower support and the upper support, and the height of the upper end of the connecting jig is preferably equal to or higher than the top of the concrete to be poured. The connecting jig is preferably a dish-shaped member with side plates extending upward from a bottom plate around the periphery of the bottom plate, and the upper support is preferably placed on the bottom plate. The pair of side plates, which are positioned opposite each other, preferably slope upward away from the bottom plate. The above-mentioned connecting jig prevents the upper support member from being embedded in the concrete, allowing it to be easily removed. Furthermore, by making the connecting jig a dish-shaped member, the connecting jig can be made simple and lightweight. Furthermore, by tilting the side plates of the connecting jig as described above, the connecting jig can be easily removed from the concrete.

[0012] The upper support material has legs spaced apart in the extension direction of the side portion on the underside of a beam material extending in the extension direction of the side portion, and it is desirable that the legs be positioned on the connecting jig. In this case, the connecting jig only needs to be placed at the portion corresponding to the leg of the upper support member, and the connecting jig can be made smaller.

[0013] The lower support member may be a reinforcing steel bar embedded in the side portion and protruding upward from the side portion. This allows the reinforcing steel bars at the corners of the slab and sides to be used as lower support materials for the support section.

[0014] The bottom formwork is, for example, a half-precast member made of concrete. The bottom formwork, which is suspended from the support structure, is typically a half-precast concrete member, and using this as an embedded formwork streamlines the construction of the slab.

[0015] The second invention is a method for constructing a slab using the concrete by the following steps: using the support structure of the first invention to suspend and support the bottom formwork from the shoring erected between a pair of the side sections, pouring the concrete onto the bottom formwork and the side sections; and removing the shoring and the upper support material and filling a filler material into a recess formed in the concrete at a planar position corresponding to the upper support material. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a support structure for shoring that allows slab construction work to be easily carried out. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a diagram showing a support structure 1. [Figure 2] A diagram showing the state after concrete Con has been poured. [Figure 3] A diagram showing the state after the support structure 5 and hanging materials 6 have been removed. [Figure 4] FIG. 10 is a diagram showing the state in which the upper support member 12 and the connecting jig 13 have been removed. [Figure 5] FIG. 10 is a diagram showing a state in which a filler 17 is filled into the recess 16. [Figure 6] 10 shows an example of a method for attaching the upper support member 12 and the connecting jig 13 to the lower support member 11. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. 10 is a diagram showing support portions 10d and 10e. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0019] (1. Support structure 1) Figure 1 shows a support structure 1 according to an embodiment of the present invention, and illustrates the state in which, during construction of a box culvert, support structures 5 are spanned using the support structure 1 and half-precast members 7 are suspended and supported from the support structures 5.

[0020] Figure 1(a) shows a cross section of the support structure 1 in the width direction of the box culvert, and Figure 1(b) shows a cross section along the axial direction of the box culvert at the position of line AA in Figure 1(a). Note that Figure 1(a) is a cross section at the position of line BB in Figure 1(b). The width direction of the box culvert is a direction perpendicular to the axial direction of the box culvert in a plan view.

[0021] The support structure 5 is spanned between a pair of side sections 2 in the width direction of the box culvert. The side sections 2 are wall-like members made of reinforced concrete. The top of the side sections 2 forms the corner between the slab of the top plate of the box culvert and the side sections 2, and reinforcing steel bars 21 are placed at the corner. The reinforcing steel bars 21 are the main reinforcing bars (axial reinforcing bars) of the side sections 2, are embedded in the side sections 2 and protrude from the top surface of the side sections 2, and their protruding ends are bent at approximately 90° toward the other side section 2. The reinforcing steel bars 21 are placed at intervals in the axial direction of the box culvert, i.e., in the extension direction on the plane of the side sections 2.

[0022] The half precast member 7 is the bottom formwork used when pouring the concrete Con for the top plate (slab) of the box culvert, and is also an embedded formwork that is left in place after the concrete Con is poured. The half precast member 7 has main steel members 72 attached to the top surface of a concrete precast plate 71. Multiple half precast members 7 are arranged in the axial direction of the box culvert as needed.

[0023] The precast slab 71 is a plate-like member, and both ends in the width direction of the box culvert are placed on a pair of side portions 2 in the width direction of the box culvert.

[0024] The main steel members 72 are steel members arranged to extend in the width direction of the box culvert, and are made of shaped steel such as channel steel. The main steel members 72 impart rigidity to the half precast member 7 to prevent deformation when the concrete Con is poured, and also function as reinforcing material for the underside of the top slab after the concrete Con is poured. Note that although the main steel members 72 are exemplified here as shaped steel members, reinforcing bars such as lattice bars may also be fixed to the precast slab 71 as the main steel members 72.

[0025] Multiple main steel members 72 are arranged at intervals in the axial direction of the box culvert, and the lower parts of these main steel members 72 are embedded in a single precast slab 71. Both ends of each main steel member 72 protrude outward in the width direction of the box culvert from the precast slab 71 and are positioned on a pair of side portions 2 in the width direction of the box culvert. "Outward" refers to the direction away from the center of the box culvert in the width direction.

[0026] The shoring 5 is a steel member arranged to extend in the width direction of the box culvert. Both ends of the shoring 5 are supported by supports 10 provided on a pair of side sections 2 in the width direction of the box culvert, and the shoring 5 is erected between these supports 10. Multiple shoring 5 are installed at intervals in the axial direction of the box culvert.

[0027] The upper end of the hanging member 6 is fixed to the shoring 5. The shoring 5 in this embodiment is configured by arranging a pair of I-beams in parallel, and the upper end of the hanging member 6 is passed between these I-beams and fixed between the upper surfaces of the I-beams. However, the shoring 5 is not limited to this.

[0028] A plurality of hanging members 6 are provided in the width direction of the box culvert, and the lower ends of these hanging members 6 hanging down from the shoring 5 are attached to the main steel member 72 of the half precast member 7 or to an insert (not shown) embedded in the precast slab 71 of the half precast member 7. In this way, the half precast member 7 is suspended and supported from the shoring 5.

[0029] The support part 10 of this embodiment has a configuration in which an upper support member 12 and a connecting jig 13 are installed on a lower support member 11 so as to be detachable from the lower support member 11 .

[0030] An H-shaped steel beam with a predetermined height is used for the lower support member 11, and the H-shaped steel beam is positioned so that both flanges are positioned one above the other. The lower support member 11 is fixed to the upper surface of the side section 2 by placing the lower flange on the upper surface of the side section 2, passing the shank of a headed bolt 111 through a hole (not shown) in the lower flange, and tightening it into a screw hole in an insert (not shown) embedded in the top edge of the side section 2. The lower support member 11 is positioned so as not to interfere with the reinforcing steel bars 21 or the half precast member 7.

[0031] The connecting jig 13 is installed on the upper flange of the lower support member 11. The connecting jig 13 is a steel dish-shaped member with side plates 132 extending upward from a bottom plate 131 around the periphery of the bottom plate 131. The pair of side plates 132 facing each other in the width direction of the box culvert are inclined so as to move away from the bottom plate 131 as they go upward.

[0032] The upper support member 12 has legs 122 provided on the underside of a beam 121 extending in the extension direction of the side portion 2 at intervals in the extension direction of the side portion 2, and in this embodiment, a portal rigid frame is formed by the beam 121 and the legs 122. H-shaped steel beams having a predetermined height are used for the beam 121 and the legs 122, and the H-shaped steel is arranged so that both flanges are positioned above and below.

[0033] The upper support member 12 is arranged with the lower flanges of the legs 122 placed on the bottom plate 131 of the connecting jig 13. The side plates 132 of the connecting jig 13 prevent the upper support member 12 from shifting out of position.

[0034] Holes (not shown) are formed in corresponding positions on the upper flange of the lower support member 11, the bottom plate 131 of the connecting jig 13, and the lower flange of the leg 122 of the upper support member 12. The shank of a headed bolt 14 is passed through the hole in each member from below, and a nut 15 is tightened onto the protruding part of the shank that protrudes from the lower flange of the leg 122, thereby removably attaching the upper support member 12 and the connecting jig 13 to the lower support member 11. The hole in the bottom plate 131 of the connecting jig 13 may be an elongated hole extending in the direction of extension of the side portion 2, allowing for the absorption of construction errors.

[0035] The height of the upper end of the lower support material 11 is lower than the top edge of the concrete Con to be poured in the process described below, but the height of the upper end of the connecting jig 13 (the height of the upper end of the side plate 132) is set to be higher than the top edge of the concrete Con.

[0036] (2. Construction method of the top plate) In this way, the shoring 5 is supported on the side 2 of the box culvert, and the half precast members 7 are suspended and supported from the shoring 5. With this in place, reinforcing steel bars (not shown) are placed on the top of the top plate above the half precast members 7, and concrete Con is poured on top of the half precast members 7 and the side 2, as shown in Figure 2. The reinforcing steel bars on the top of the top plate are placed consecutively to the protruding ends of the reinforcing steel bars 21 (see Figure 1(a)) and connected with joints or the like.

[0037] The concrete Con is poured up to a height equal to or lower than the upper end of the connecting jig 13. Therefore, the concrete Con does not enter the inside of the connecting jig 13, and the upper support member 12 is not buried in the concrete Con.

[0038] Once the curing of the concrete Con is complete, the support 5 and the upper part of the hanging member 6 are removed as shown in Figure 3. The part of the hanging member 6 above the top surface of the concrete Con is removed, and the remaining part is left inside the concrete Con. The hanging member 6 may be pre-processed so that the part above the top surface of the concrete Con can be separated and removed.

[0039] After removing the shoring 5 and the like, remove the nuts 15, and as shown in Figure 4, remove and remove the upper support member 12 and connecting jig 13 from the lower support member 11. This forms a recess 16 on the top surface of the concrete Con at a planar position corresponding to the upper support member 12. Because the connecting jig 13 is a small component and has the aforementioned inclination on the side plate 132, it is easy to pull out from the concrete Con and remove it.

[0040] After removing the upper support member 12 and the connecting jig 13, fill the recess 16 with a filler 17 such as non-shrink mortar and bury the bolts 14 as shown in Figure 5. This completes the construction of the top slab of the box culvert with concrete Con.

[0041] As described above, in this embodiment, the half-precast member 7, which serves as the bottom formwork for constructing the box culvert top slab, is suspended and supported by the shoring 5. The support section 10 supporting the shoring 5 is divided into a lower support member 11 and an upper support member 12, with the upper support member 12 detachably installed relative to the lower support member 11. These supports are made of steel and are compact by being divided into upper and lower parts, reducing the weight of the members and eliminating the need to assemble formwork on the side members 2 to form the support members. Furthermore, in this embodiment, the upper support member 12 can be removed without cutting it by detaching it from the lower support member 11, and it can also be reused. As described above, this embodiment facilitates the construction of the top slab. Furthermore, because the top end of the remaining lower support member 11 is positioned lower than the top edge of the concrete Con, the steel material is prevented from being exposed on the top surface of the slab.

[0042] Furthermore, in the support section 10, a connecting jig 13 is placed between the lower support member 11 and the upper support member 12, and the height of its upper end is set to be equal to or higher than the top edge of the concrete Con, so that the upper support member 12 is not buried in the concrete Con and can be easily removed. The connecting jig 13 is a dish-shaped member with side plates 132 provided around the periphery of a bottom plate 131, allowing the connecting jig 13 to have a simple and lightweight configuration, and by placing the upper support member 12 on the bottom plate 131, the overall height of the support section 10 can be reduced. Furthermore, because the side plates 132 are inclined as described above, the connecting jig 13 can be easily removed from the concrete Con, facilitating removal.

[0043] Furthermore, the upper support member 12 has a plurality of legs 122 spaced apart on the underside of the beam member 121, and the connecting jig 13 only needs to be placed in the area corresponding to the legs 122, allowing the connecting jig 13 to be made smaller.

[0044] However, the present invention is not limited to the above-described embodiments. For example, while the above-described embodiments have been described using an example of constructing a top plate of a box culvert, the support member 10 of the present invention can also be applied when constructing slabs for other structures, and the shape of the side member 2 is not limited to a wall shape and can vary depending on the structure. Furthermore, in the above-described embodiments, the half precast members 7 used as buried formwork when constructing the slab are suspended from the shoring 5, but it is also possible to suspend and support a normal bottom formwork from the shoring 5, pour concrete onto the bottom formwork to form the slab, and then remove the bottom formwork.

[0045] In this embodiment, the upper support material 12 and the connecting jig 13 are attached to the lower support material 11 by tightening a nut 15 from the upper support material 12 side onto the shank of the bolt 14 inserted from the lower support material 11 side. However, as shown in Figure 6(a), the nut 15 may be fixed to the underside of the upper flange of the lower support material 11, and the shank of the bolt 14 inserted from the upper support material 12 side may be tightened into the nut 15.

[0046] In the example of Figure 6(b), a screw hole (not shown) that does not reach the underside is provided on the upper surface of the upper flange of the lower support member 11, and the shank of the bolt 14 is fastened into the screw hole. Furthermore, as shown in Figure 6(c), the bolt 14 (and the screw hole) may be positioned to avoid a planar position of the upper support member 12, and only the connecting jig 13 may be attached to the lower support member 11 by the bolt 14. In the example of Figure 6(c), there is no need to drill holes in the legs 122 of the upper support member 12, making installation easier. Furthermore, the upper support member 12 can be removed from the lower support member 11 simply by lifting it up.

[0047] In any of the cases shown in Figures 6(a) to (c), the upper support material 12 and connecting jig 13 can be removed by removing the bolts 14 after pouring the concrete Con, and the bolts 14 will not be exposed in the recesses 16 after removal, as shown in Figure 4.

[0048] In this embodiment, the upper support member 12 is configured by fixing short legs 122 at intervals to the underside of a long beam member 121, but the configuration of the upper support member 12 is not limited to this. For example, as shown in the support portion 10a in Figures 7(a) and (b), the upper support member 12a may be configured only by a beam member 121 extending in the extension direction of the side portion 2. Figures 7(a) and (b) show the support portion 10a in the same cross section as Figures 1(a) and (b).

[0049] In this case, the lower flange of the beam 121, the bottom plate 131 of the connecting jig 13, and the upper flange of the lower support member 11 are fastened together using bolts 14 and nuts 15, but the connecting jig 13 needs to be long enough to surround the entire lower flange of the beam 121. Therefore, in terms of being able to make the connecting jig 13 smaller, it is preferable to configure the upper support member 12 with the beam 121 and legs 122, as described above, and to place the connecting jig 13 only in the portion corresponding to the legs 122.

[0050] 8, side plates 123 may be provided around the lower flanges of the legs 122 of the upper support member 12b, and may be dish-shaped similar to the connecting jig 13. In this case, the connecting jig 13 is omitted, and the upper support member 12b is placed directly on the lower support member 11, and the lower flanges of the legs 122 of the upper support member 12b are fastened to the upper flange of the lower support member 11 with bolts 14 and nuts 15, allowing the upper support member 12b to be removably attached to the lower support member 11. Concrete Con is poured up to a height below the upper ends of the side plates 123. Furthermore, the pair of side plates 123 in the width direction of the box culvert have the same slope as the side plates 132 described above.

[0051] In addition, in this embodiment, H-shaped steel is used as the beams 121 and legs 122 of the upper support members 12, 12a, and 12b, but it is also possible to use steel beams other than H-shaped steel, such as channel steel, and it is also possible to use steel materials other than structural steel.

[0052] In this embodiment, the connecting jig 13 is a steel member, but the connecting jig 13 may also be made of wood. A hardening retarder or a joint treatment sheet may be provided on the outer surface of the connecting jig 13. This will form irregularities on the inner wall of the recess 16 when the connecting jig 13 is removed, thereby improving the integrity of the concrete Con and the filler 17.

[0053] The connecting jig 13 may also be made of a high-strength, durable cement-based material such as ultra-high-strength fiber-reinforced concrete. In this case, the connecting jig 13 may be left in place after the concrete Con is poured, and the durability of the finished surface can be ensured by filling the inside of the connecting jig 13 with filler 17. Furthermore, by roughening the outer and inner surfaces of the connecting jig 13, it is possible to ensure its integrity with the concrete Con and filler 17.

[0054] In this embodiment, the connecting jig 13 is dish-shaped, but the shape of the connecting jig 13 is not limited to this. For example, the support part 10c in Fig. 9 is an example in which the connecting jig 13a is an upside-down truncated pyramidal member. In this way, the connecting jig 13a does not necessarily have to be dish-shaped, as long as the height of its upper end is equal to or higher than the top edge of the concrete Con.

[0055] Furthermore, the lower support member 11 is not limited to the one described above. For example, shaped steel other than H-shaped steel or other steel materials can be used as the lower support member 11. As one example, when the reinforcing steel bar 21 has sufficient strength and rigidity, or when the load borne by the shoring 5 is small, the reinforcing steel bar 21 may be used as the lower support member, and the upper support member 12 and connecting jig 13 may be removably installed on top of the reinforcing steel bar 21, as shown in support part 10d in FIG. 10(a). By using the reinforcing steel bar 21 as the lower support member, the installation work for the lower support member can be omitted.

[0056] In this example, the horizontal portion of the reinforcing steel bars 21 is sandwiched between the connecting jig 13 and the fixing steel plate 19 below it, and bolts 14 and nuts 15 are used to vertically fasten the lower flange of the leg 122 of the upper support member 12, the bottom plate 131 of the connecting jig 13, and the fixing steel plate 19. The connecting jig 13 and the fixing steel plate 19 are arranged so as to sandwich the multiple reinforcing steel bars 21 in the extension direction of the side portion 2 from above and below, and are fixed to these reinforcing steel bars 21.

[0057] As shown in support portion 10e of FIG. 10(b), in addition to the reinforcing bars 21, reinforcing bars 22 protruding upward in a U-shape from the side portion 2 may be provided. These reinforcing bars 22 may be used as lower support members, and the upper support member 12 and connecting jig 13 may be removably installed on top of the reinforcing bars 22. In this case, the reinforcing bars 22 can also increase the shear strength of the corners. In the example of FIG. 10(b), the bottom plate 131 of the connecting jig 13 is installed on top of the top portions of the reinforcing bars 22. Multiple reinforcing bars 22 are installed at intervals in the extension direction of the side portion 2 at positions corresponding to each leg 122 of the upper support member 12. Horizontal reinforcing bars 23 are installed below the top portions of these reinforcing bars 22 in the extension direction of the side portion 2. The horizontal reinforcing bars 23 are placed on top of the horizontal portions of the reinforcing bars 21. In the example of Figure 10(b), the upper support material 12 and connecting jig 13 are installed on top of the reinforcing steel bars 22, but they may also be attached to the reinforcing steel bars 22 or horizontal steel bars 23 using a fixing steel plate 19, bolts 14, and nuts 15 similar to those in Figure 10(a).

[0058] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that those skilled in the art can conceive of various modifications or alterations within the scope of the technical ideas disclosed herein, and it is understood that these modifications also fall within the technical scope of the present invention. [Explanation of symbols]

[0059] 1: Support structure 2: Side 5: Shoring 6: Hanging material 7: Half precast member (bottom formwork) 10, 10a, 10b, 10c, 10d, 10e: Support part 11: Lower support material 12, 12a, 12b: Upper support material 13, 13a: Connection jig 14: Bolt 15: Nut 16: Recess 17: Filling material 21, 22: Reinforcement bars 121: Beam material 122: Legs 131: Bottom plate 132: Side panel

Claims

1. A support structure for supporting the shoring on the side when erecting a shoring between a pair of side parts and constructing a slab by pouring concrete on a bottom formwork suspended from the shoring and the side parts, The support is installed between the support portions provided on the pair of side portions, The support portion is a steel lower support member fixed to the upper surface of the side portion; a steel upper support member removably mounted on the lower support member; and A support structure for shoring, characterized in that the height of the upper end of the lower support material is lower than the top of the concrete to be poured.

2. the support portion further includes a connection jig that is detachably installed on the lower support member between the lower support member and the upper support member, 2. A support structure for shoring according to claim 1, wherein the height of the upper end of the connecting jig is equal to or higher than the top of the concrete to be poured.

3. the connecting jig is a dish-shaped member having a bottom plate and side plates extending upward from the bottom plate around the bottom plate, 3. The support structure according to claim 2, wherein the upper support member is placed on the bottom plate.

4. 4. A support structure for shoring according to claim 3, wherein the pair of side plates located opposite each other are inclined in a direction away from the bottom plate as they go upward.

5. the upper support member has legs provided on a lower surface of a beam member extending in the extension direction of the side portion at intervals in the extension direction of the side portion, The support structure according to claim 2, wherein the leg portion is disposed on the connecting jig.

6. 2. The support structure for shoring according to claim 1, wherein the lower support material is a reinforcing steel bar embedded in the side portion and protruding upward from the side portion.

7. 2. The support structure for shoring according to claim 1, wherein the bottom formwork is a half-precast member made of concrete.

8. a step of suspending and supporting the bottom formwork from the supports erected between the pair of side sections using the support structure according to any one of claims 1 to 7, and pouring the concrete onto the bottom formwork and the side sections; a step of removing the support and the upper support material, and filling a recess formed in the concrete at a planar position corresponding to the upper support material with a filler; Therefore, A method for constructing a slab, comprising constructing a slab using the concrete.

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