Support structure for working platform and construction method for concrete structure

Abstract

To provide a support structure for a working platform capable of reducing labor required for construction of concrete structures, and a construction method for concrete structures.SOLUTION: A support structure 100 for a working platform comprises: a plurality of concrete formworks 1 formed from materials including concrete and arranged in vertical and horizontal directions; transverse connecting members 2 connecting the plurality of concrete formworks 1 arranged adjacent to each other in the horizontal direction; and support members 3 connecting the plurality of concrete formworks arranged adjacent to each other in the vertical direction. The working platform is detachably mounted on the support members 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a support structure for a work platform and a method for constructing a concrete structure. [Background technology]

[0002] Conventionally, concrete structures are constructed by arranging reinforcing bars in a formwork made of plywood or the like, pouring concrete, and allowing the concrete to harden (see Patent Document 1 below).

[0003] In recent years, in response to SDGs and carbon neutrality, as well as the advancement and rationalization of design methods, the number of concrete structures with more compact shapes has been increasing. For example, there are examples of typical concrete structures such as caissons and culverts that are structurally viable even with relatively small side walls of around 1.0 to 1.5 m wide.

[0004] On the other hand, various design standards in Japan have been revised and tightened several times since the 1995 Hyogo-ken Nanbu Earthquake and the 2011 Great East Japan Earthquake, and the amount of rebar required to satisfy the required performance of structures is on the rise. As a result, concrete structures in recent years tend to have small cross sections and high-density reinforcement. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2023-117254 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when constructing a concrete structure with a small cross section and high-density reinforcement, there is a problem in that it is difficult to set up a scaffold for assembling rebars and assemble a large amount of large-diameter rebars in a narrow working environment.

[0007] Therefore, the present invention has been made in consideration of the above circumstances, and provides a support structure for a work platform and a method for constructing a concrete structure that can reduce the number of people required for constructing a concrete structure. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention employs the following means. In other words, the support structure for a work platform according to the present invention is formed from a material containing concrete and comprises a plurality of concrete formworks arranged in the vertical and horizontal directions, horizontal connecting members that connect the plurality of concrete formworks arranged adjacent to each other in the horizontal direction, and support members that connect the plurality of concrete formworks arranged adjacent to each other in the vertical direction, and the work platform is removably attached to the support members.

[0009] In the support structure for the work platform configured in this way, multiple concrete formworks are connected horizontally by horizontal connectors and vertically by support members. Because the concrete formwork itself is made of a material containing concrete, the concrete formwork can be used as part of the concrete structure. Because the work platform can be detachably attached to the support member, the work platform can be installed on the support member when placing rebar, and can be removed from the support member after the work is complete. Therefore, since the work platform can be installed only where necessary, a large work platform is not required, and using concrete formwork allows some formwork to be omitted, thereby reducing the number of workers required for construction.

[0010] In addition, in the support structure for a work platform according to the present invention, the concrete formwork may include a formwork body formed in a plate shape, and an uneven portion having a convex portion provided on a first surface on one side in the thickness direction of the formwork body.

[0011] In the support structure of the work platform configured in this manner, when pouring concrete on site, if the concrete is poured so that it adheres to the unevenly shaped portion having convex parts, the fixing area between the concrete formwork and the poured-in-place concrete will be increased, thereby increasing the strength of the concrete structure.

[0012] In addition, in the support structure for a work platform according to the present invention, the convex portion may extend along the left-right direction of the concrete formwork, and may be formed in plurality at intervals in the up-down direction.

[0013] In the support structure for the work platform configured in this way, the convex portions extend along the left-right direction of the concrete formwork and are formed at intervals in the up-down direction. Therefore, when concrete is poured from below at the site, the concrete is poured sequentially at the same height from left to right, which improves workability.

[0014] In addition, in the support structure for a work platform according to the present invention, a first corner formed by the first surface and the lower surface of the convex portion, and a second corner formed by the lower surface of the convex portion and the tip surface may be curved.

[0015] In the support structure for a work platform configured in this manner, the first corner and the second corner are curved, so that the cast-in-place concrete can be tightly filled between the first corner and the second corner without leaving any gaps, improving the filling efficiency of the concrete.

[0016] In the support structure for a work platform according to the present invention, the form body may be formed in a flat plate shape.

[0017] In the support structure for the work platform configured in this manner, the formwork body is formed in a flat plate shape, so that a flat plate-shaped concrete structure can be constructed.

[0018] In the support structure for a work platform according to the present invention, the form body may be formed in the shape of a curved plate.

[0019] In the support structure for the work platform configured in this manner, the formwork body is formed in a curved plate shape, so that a curved plate-shaped concrete structure can be constructed.

[0020] In the support structure for a work platform according to the present invention, the support material may be formed with bolt holes for connecting the work platform.

[0021] In the support structure for a work platform configured in this manner, bolt holes for connecting the work platform are formed in the support material, so that the work platform can be easily connected to the support material with bolts.

[0022] Furthermore, the method for constructing a concrete structure according to the present invention comprises a concrete form installation process of installing a plurality of concrete forms of the support structure of the above-mentioned work platform in the vertical and horizontal directions, connecting the plurality of concrete forms installed in the horizontal direction with horizontal connecting members, and connecting the plurality of concrete forms installed in the vertical direction with supporting members; a reinforcing bar arrangement process of arranging reinforcing bars in an area at a predetermined height on one side of the thickness direction of the plurality of concrete forms; a work platform installation process of fixing the work platform to the supporting members; an upper reinforcing bar arrangement process of using the work platform by a worker to arrange reinforcing bars in an area above the area from the predetermined height; a work platform removal process of removing the work platform from the supporting members; and a concrete pouring process of pouring concrete to bury the reinforcing bars.

[0023] In this method for constructing a concrete structure, multiple concrete formworks are connected horizontally by horizontal connectors and vertically by support members. Because the concrete formwork itself is made of a material containing concrete, the concrete formwork can be used as part of the concrete structure. Because a work platform can be detachably attached to the support member, the work platform can be installed on the support member when placing rebar, and can be removed from the support member after the work is complete. Therefore, since the work platform can be installed only where necessary, a large work platform is not required, and using concrete formwork allows some formwork to be omitted, thereby reducing the number of workers required for construction.

[0024] Furthermore, in the method for constructing a concrete structure according to the present invention, the work platform installation step, the upper reinforcement step, and the work platform removal step may be repeated before the concrete pouring step, and reinforcing bars may be further arranged on the upper side.

[0025] In the method for constructing a concrete structure configured in this manner, reinforcing bars can be arranged successively on the upper side by repeatedly setting up and removing the work platform. [Effects of the Invention]

[0026] According to the support structure for a work platform and the method for constructing a concrete structure of the present invention, the construction of a concrete structure can be performed with less manpower. [Brief explanation of the drawings]

[0027] [Figure 1] FIG. 1 is a perspective view showing a support structure for a work platform according to an embodiment of the present invention. [Figure 2] 1 is a perspective view showing a concrete formwork according to an embodiment of the present invention. [Figure 3] 1 is a cross-sectional view showing a concrete formwork according to one embodiment of the present invention. [Figure 4] FIG. 10 is a perspective view showing a concrete formwork according to a modified example of one embodiment of the present invention. [Figure 5] FIG. 2 is an enlarged view of part V in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. [Figure 8] 1 is a cross-sectional view showing a state in which a work platform is supported by a support structure for a work platform according to an embodiment of the present invention. FIG. [Figure 9] FIG. 10 is a cross-sectional view showing a state in which a work platform of Modification 1 is supported on a support structure for a work platform according to one embodiment of the present invention. [Figure 10] FIG. 10 is a cross-sectional view showing a state in which a work platform of Modification 2 is supported on a support structure for a work platform according to one embodiment of the present invention. [Figure 11] 1 is a diagram showing a concrete formwork installation step of a concrete structure construction method according to one embodiment of the present invention. FIG. [Figure 12] 1 is a diagram showing a reinforcement step of a concrete structure construction method according to an embodiment of the present invention. FIG. [Figure 13] FIG. 10 is a diagram showing a work platform installation step in the concrete structure construction method according to one embodiment of the present invention. [Figure 14] FIG. 10 is a diagram showing an upper reinforcement step of a concrete structure construction method according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0028] (Work platform support structure) A support structure for a work platform and a method for constructing a concrete structure according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a support structure for a work platform according to one embodiment of the present invention. A worker can perform reinforcing bar arrangement work by standing on a work platform 4 (see FIG. 8) supported by a support structure for the work platform (hereinafter simply referred to as the "support structure") 100 shown in FIG. 1. Concrete can be poured along a concrete formwork 1 that is part of the support structure 100.

[0029] The following describes the support structure 100. The support structure 100 includes a plurality of concrete formworks 1, splice plates (horizontal connecting members) 2, and vertical connecting members (support members) 3.

[0030] In the following explanation, the left-right direction when the uneven portion 13 of the concrete formwork 1 of the support structure 100 is viewed from the front will be referred to as the left-right direction, and the up-down direction will be referred to as the up-down direction. The direction perpendicular to the left-right direction and the up-down direction will be referred to as the front-to-back direction. Even when explaining the concrete formwork 1 alone, the explanation will be based on the directions when the support structure 100 is viewed from the front. The left-right direction is indicated by arrow X, the front-to-back direction is indicated by arrow Y, and the up-to-down direction is indicated by arrow Z.

[0031] The concrete formwork 1 is formed in a plate shape. A plurality of concrete formworks 1 are arranged along the vertical and horizontal directions.

[0032] FIG. 2 is a perspective view showing the concrete formwork 1. As shown in FIG. 2, the concrete formwork 1 is made of a material containing concrete. The concrete formwork 1 is made of, for example, fiber reinforced cement, and has high strength due to autoclave curing.

[0033] The concrete formwork 1 is formed in a substantially rectangular shape when viewed from the front-to-rear direction. The concrete formwork 1 includes a formwork main body 11 and an uneven portion 13. The formwork main body 11 and the uneven portion 13 are integrally formed from a material containing concrete. Note that the concrete formwork 1 may be formed only partially from a material containing concrete as long as it has the desired strength. The shape of the concrete formwork 1 can be set as appropriate.

[0034] The formwork body 11 is formed in a flat plate shape. The plate surface of the formwork body 11 faces the front-rear direction. The rear surface 11a, which is the surface on one side in the thickness direction of the formwork body 11, is arranged along a plane that extends in the left-right and up-down directions.

[0035] The uneven portion 13 is provided on the front surface (first surface) 11b, which is the surface on the other side of the formwork body 11 in the thickness direction.

[0036] The uneven portion 13 has a plurality of protrusions 14. The protrusions 14 protrude forward from the front surface 11b of the formwork body 11. The protrusions 14 extend in the left-right direction. A plurality of the protrusions 14 are formed at intervals in the up-down direction.

[0037] FIG. 3 is a cross-sectional view showing the concrete formwork 1. As shown in FIG. 3, recesses 15 are formed between the upper and lower protrusions 14, recessing rearward from tip surfaces 14a, which are the forward-facing surfaces of the protrusions 14. In the uneven shape portion 13, the protrusions 14 and the recesses 15 are arranged alternately in the vertical direction.

[0038] Corner (second corner) 14c where tip surface 14a of convex portion 14 intersects with lower surface 14b of convex portion 14 is formed by a smoothly curved surface. Corner (first corner) 14d where front surface 11b intersects with lower surface 14b of convex portion 14 is formed by a smoothly curved surface. Because corners 14c, 14d are formed by a smoothly curved surface, when concrete is poured along uneven portion 13, the concrete easily flows into recesses 15, improving filling properties. Note that corners 14c, 14d may be C-chamfered or sharp, such as at a right angle.

[0039] (Modification of concrete formwork) Next, modified examples of the concrete formwork will be described mainly with reference to Fig. 4. In the following description of the modified examples, the same reference numerals will be used to designate the same or similar members and parts as those in the above-described embodiment, and the description will be omitted, and only configurations that differ from the embodiment will be described. FIG. 4 is a perspective view showing a concrete formwork according to a modified example of one embodiment of the present invention. As shown in Figure 4, the rear surface 11c of the form body 11A of the concrete formwork 1A is formed in the shape of a curved plate. The rear surface 11c of the formwork body 11 is arranged along a gently curved surface that slopes forward. The concrete formwork 1A can be used as a concrete formwork when constructing concrete structures with curved surfaces, such as cylindrical structures.

[0040] FIG. 5 is an enlarged view of a portion V in FIG. As shown in Fig. 5, the splice plate 2 is disposed across the adjacent concrete formworks 1 in the left-right direction. The splice plate 2 is formed in a flat plate shape. The plate surface of the splice plate 2 faces the front-rear direction. The splice plate 2 is formed of a material such as steel.

[0041] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. As shown in FIG. 6 , the splice plate 2 is disposed in contact with the tip surface 14a of the protrusion 14 of the concrete formwork 1. The splice plate 2 has a mounting hole 21 that penetrates through it in the thickness direction. The protrusion 14 of the concrete formwork 1 has a bolt hole 16 that is recessed rearward from the tip surface 14a. The bolt hole 16 extends to the formwork main body 11 rearward of the front surface 11b, but may also be formed to fit within the front-to-rear region of the protrusion 14. The bolt 22 is inserted through the mounting hole 21 of the splice plate 2 and fastened to the bolt hole 16 of the concrete formwork 1. Adjacent concrete forms 1 in the left-right direction are connected to each other via the splice plate 2.

[0042] As shown in FIG. 5, the vertical tie member 3 is arranged across adjacent concrete formwork 1 in the vertical direction. The vertical tie member 3 is formed in an L-shape in horizontal cross section. The vertical tie member 3 is an L-shaped member made of a material such as steel. The vertical tie member 3 may also be a C-shaped member that is C-shaped in horizontal cross section, and the shape can be set as appropriate. The vertical tie member 3 has a fixed plate portion 31 and a bent plate portion 36.

[0043] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. As shown in FIG. 7 , the fixing plate portion 31 is formed in a flat plate shape. The plate surface of the fixing plate portion 31 faces the front-to-rear direction. The fixing plate portion 31 is disposed in contact with the tip surface 14a of the protrusion 14 of the concrete formwork 1. The fixing plate portion 31 has an attachment hole 32 formed therethrough in the thickness direction. The protrusion 14 of the concrete formwork 1 has a bolt hole 17 formed therethrough that is recessed rearward from the tip surface 14a. The bolt hole 17 extends to the formwork main body 11 rearward of the front surface 11b, but may also be formed to fit within the front-to-rear region of the protrusion 14. The bolt 33 is inserted through the attachment hole 32 of the vertical tie member 3 and fastened to the bolt hole 17 of the concrete formwork 1. Vertically adjacent concrete formwork 1 are connected to each other via the vertical tie members 3.

[0044] The bent plate portion 36 extends forward from the fixed plate portion 31. The bent plate portion 36 is formed in a flat plate shape. The plate surface of the bent plate portion 36 faces the left and right directions. The bent plate portion 36 has the function of resisting the lateral pressure of the cast-in-place concrete C.

[0045] A bolt hole 37 is formed through the bent plate portion 36 in the thickness direction. The bolt hole 37 is a bolt hole for connecting a work platform 4 (see FIG. 8) described later.

[0046] (Work platform) Next, we will explain the configuration in which the support structure 100 supports the work platform 4. The work platform 4 is used when arranging main reinforcement (reinforcing bars) 51 and distribution reinforcement (reinforcing bars) 52 in front of the concrete formwork 1.

[0047] FIG. 8 is a cross-sectional view showing the state in which the work platform 4 is supported by the support structure 100. As shown in FIG. As shown in FIG. 8, the work platform 4 is L-shaped when viewed from the left-right direction. The work platform 4 has a fixed portion 41 and a support portion 42. The fixed portion 41 extends in the vertical direction. The fixed portion 41 is arranged along the bent plate portion 36 of the vertical tie member 3. The fixed portion 41 has an attachment hole (not shown) that penetrates in the left-right direction. A bolt 43 is inserted into the attachment hole of the fixed portion 41 and fastened to the bolt hole 37 (see FIG. 7) of the bent plate portion 36. The support portion 42 extends forward from the fixed portion 41. The work platforms 4 are arranged spaced apart in the left-right direction. A scaffolding board 49 is installed so as to span adjacent work platforms 4 in the left-right direction. The work platforms 4 can be removed from the support structure 100 by removing the bolt 43. The work platforms 4 are detachably attached to the vertical tie members 3.

[0048] A worker stands on scaffolding boards 49 and installs main reinforcements 51 and distribution reinforcements 52 in front of the concrete formwork 1. A plurality of main reinforcements 51 extending in the vertical direction are installed at intervals in the left-right direction. A plurality of distribution reinforcements 52 extending in the left-right direction are installed at intervals in the up-down direction.

[0049] (Work platform variation 1) Next, Modification 1 of the work platform will be described mainly with reference to Figure 9. In the following description of the modification, the same or similar members and parts as those in the above-described embodiment will be designated by the same reference numerals, and their description will be omitted, and only configurations that differ from the embodiment will be described. FIG. 9 is a cross-sectional view showing a state in which a work platform of Modification 1 is supported on a support structure for a work platform according to one embodiment of the present invention. As shown in Figure 9, the work platform 4 is formed in an L-shape when viewed from the left-right direction. The work platform 4 has a pair of fixing portions 41A, 41A and a connecting portion 44. The fixing portion 41A extends in the front-rear direction. The fixing portion 41A is arranged along the bent plate portion 36 of the vertical connecting member 3. The pair of fixing portions 41A, 41A are arranged spaced apart in the up-down direction. The fixing portion 41A has an attachment hole (not shown) that penetrates in the left-right direction. A bolt 43 is inserted into the attachment hole of the fixing portion 41A and fastened to the bolt hole 37 (see Figure 7) of the bent plate portion 36. The connecting portion 44 connects the pair of fixing portions 41A, 41A.

[0050] A bracket 6 is connected to the connecting portion 44 of the work platform 4A. The bracket 6 has a substantially right-angled triangular shape when viewed from the left-right direction. The bracket 6 has a bracket fixing portion 61, a bracket support portion 62, a bracket diagonal member portion 63, and a bracket upper and lower connecting portion 64. The bracket fixing portion 61 extends in the vertical direction. The bracket fixing portion 61 is connected to the connecting portion 44 of the work platform 4A via a fixing member 66 such as a clamp. The bracket support portion 62 extends forward from the bracket fixing portion 61. The bracket diagonal member portion 63 connects the front end of the bracket support portion 62 to the lower end of the bracket fixing portion 61. The bracket upper and lower connecting portion 64 connects the bracket support portion 62 and the bracket diagonal member portion 63 in the vertical direction. The scaffolding board 49 is installed across adjacent brackets 6 in the horizontal direction.

[0051] (Work platform variant 2) Next, a second modified example of the work platform will be described mainly with reference to Figure 10. In the following description of the modified example, the same reference numerals will be used to designate the same or similar members and parts as those in the above-described embodiment, and the description will be omitted, and only the configurations that differ from the embodiment will be described. FIG. 10 is a cross-sectional view showing a state in which a work platform of Modification 2 is supported on a support structure for a work platform according to an embodiment of the present invention. As shown in Figure 10, the work platform 4B has a first fixing portion 41B and a second fixing portion 41C. The first fixing portion 41B extends in the front-to-rear direction. The second fixing portion 41C has an extension portion 41a extending forward and an inclined portion 41b extending gradually upward as it extends forward from the front end of the extension portion 41a. The rear end of the first fixing portion 41 and the rear end of the second fixing portion 41C are fixed to the bent plate portion 36 of the vertical tie member 3 with bolts 43.

[0052] (Concrete structure construction method) Next, a method for constructing a concrete structure will be described. Fig. 11 is a diagram showing a concrete formwork installation step in a concrete structure construction method according to one embodiment of the present invention. Fig. 12 is a diagram showing a reinforcement step in a concrete structure construction method according to one embodiment of the present invention. Fig. 13 is a diagram showing a work platform installation step in a concrete structure construction method according to one embodiment of the present invention. Fig. 14 is a diagram showing an upper reinforcement step in a concrete structure construction method according to one embodiment of the present invention. As shown in Figure 11, the concrete formwork installation process is carried out. Workers install multiple concrete formwork 1 in the vertical and horizontal directions. Adjacent concrete formwork 1 in the horizontal direction are connected via splice plates 2. Adjacent concrete formwork 1 in the vertical direction are connected via vertical tying members 3. A support structure 100 is constructed.

[0053] The reinforcement step is carried out as shown in Fig. 12. Main reinforcement 51 and distribution reinforcement 52 are arranged in a region of a predetermined height in front of the support structure 100. Main reinforcement 51 is connected to the upper side of the already arranged main reinforcement 51 so that it reaches the predetermined height.

[0054] The work platform installation process is carried out as shown in Figure 13. The work platforms 4 are connected to the vertical ties 3. Scaffolding boards 49 are installed so as to straddle the work platforms 4 adjacent to each other in the left-right direction.

[0055] As shown in Fig. 14, an upper reinforcement step is performed. A worker stands on a scaffolding board 49 installed on the work platform 4 and arranges main reinforcement 51 and distribution reinforcement 52 in the area above the main reinforcement 51 and distribution reinforcement 52 that have already been arranged.

[0056] Next, the work platform removal process is carried out. The work platform 4 is removed from the vertical ties 3. When arranging the main reinforcement 51 and distribution reinforcement 52 further upward, the work platform installation process of installing the work platform 4 at an even higher position, the upper reinforcement arrangement process of getting on the work platform 4 and arranging the main reinforcement 51 and distribution reinforcement 52, and the work platform removal process of removing the work platform 4 are repeated.

[0057] Once the main reinforcement 51 and distribution reinforcement 52 have been arranged to the required height, the work platform removal process is carried out and the work platform 4 is removed from the vertical tie members 3.

[0058] Next, the concrete pouring process is carried out. A formwork (not shown) is installed in front of the concrete formwork 1, and concrete is poured between the concrete formwork 1 and the formwork (not shown). The splice plates 2, vertical ties 3, main reinforcement bars 51, and distribution bars 52 are embedded in the poured concrete. In Figure 7, the area of ​​poured concrete C is indicated by a two-dot chain line.

[0059] In the support structure 100 and concrete structure construction method configured as described above, multiple concrete formworks 1 are connected horizontally by splice plates 2 and vertically by vertical ties 3. Because the concrete formworks 1 themselves are made of a material containing concrete, the concrete formworks 1 can be used as part of the concrete structure. Since a work platform 4 can be detachably attached to the vertical ties 3, the work platform 4 can be installed on the vertical ties 3 when placing the main reinforcement bars 51 and distribution reinforcement bars 52, and can be removed from the vertical ties 3 after the work is complete. Therefore, since the work platform 4 only needs to be installed where necessary, a large work platform 4 is not required, and using the concrete formworks 1 allows some formwork to be omitted, thereby reducing the number of workers required for construction.

[0060] Furthermore, when pouring concrete on-site, pouring the concrete C so that it adheres to the uneven portion 13 having the convex portion 14 and the concave portion 15 increases the area of ​​adhesion between the concrete formwork 1 and the poured-in-place concrete C, thereby increasing the strength of the concrete structure.

[0061] Furthermore, the convex portions 14 and concave portions 15 extend in the left-right direction of the concrete formwork 1, and are formed in multiple locations spaced apart in the up-down direction. Therefore, when concrete C is poured from below at the site, the concrete is filled in sequentially at the same height in the left-right direction, improving workability.

[0062] In addition, corners 14d and 14c are curved, so that the poured-in-place concrete C is tightly packed and filled without leaving any gaps between corners 14d and 14c, thereby improving the filling property of the concrete C.

[0063] Furthermore, since the formwork body 11 is formed in a flat plate shape, it is possible to construct a flat plate-shaped concrete structure.

[0064] Furthermore, since the formwork body 11A is formed in a curved plate shape, it is possible to construct a curved plate-shaped concrete structure.

[0065] Furthermore, bolt holes 37 for connecting the work platform 4 are formed in the vertical connecting members 3, so that the work platform 4 can be easily connected to the vertical connecting members 3 with bolts 43.

[0066] Furthermore, by repeatedly installing and removing the work platform 4, the main reinforcement 51 and the distribution reinforcement 52 can be arranged successively on the upper side.

[0067] Furthermore, since the work platform 4 is connected to the vertical ties 3, the work platform 4 is stably supported with the vertical ties 3 acting as a reaction force.

[0068] In addition, since the work platform 4 projects forward beyond the main reinforcement 51 and the distribution reinforcement 52, work can be performed in a wide space in front of the main reinforcement 51 and the distribution reinforcement 52, improving workability.

[0069] The assembly procedures, shapes and combinations of the components, etc. shown in the above-described embodiments are merely examples, and various modifications can be made based on design requirements, etc., within the scope of the present invention.

[0070] For example, in the embodiment described above, if the splice plates 2 and vertical ties 3 are located within the wall of the cast-in-place concrete, they are preferably treated with anti-rust coating or made of stainless steel. In severe corrosive environments, etc., the connecting hardware is not included in the design width of the frame, so the splice plates 2 and vertical ties 3 may be installed outside the design width of the frame without being treated with anti-rust coating or made of stainless steel. [Explanation of symbols]

[0071] 1,1A Concrete formwork 2 Joint plate (horizontal connection material) 3 Vertical tie material (support material) 4, 4A, 4B Work Platform 11 Formwork body 11A Formwork body 11b Front (first side) 13 Uneven part 14 Convex part 14c corner (second corner) 14d Corner (1st corner) 37 bolt holes 51 Main reinforcement (reinforcement) 52 Reinforcement bars (reinforced bars) 100 Support structure (support structure for work platform) C. Concrete

Claims

1. a plurality of concrete formworks formed of a material containing concrete and arranged in the vertical and horizontal directions; a horizontal connecting member that connects the plurality of concrete formworks arranged adjacent to each other in the left-right direction; and a support member connecting the plurality of concrete formworks arranged adjacent to each other in the vertical direction, A support structure for a work platform, in which a work platform is detachably mounted on the support material.

2. The concrete formwork is A formwork body formed in a plate shape; The support structure for a work platform according to claim 1, further comprising: a concave-convex portion having a convex portion provided on a first surface on one side of the form body in a thickness direction.

3. 3. The support structure for a work platform according to claim 2, wherein the convex portions extend along the left-right direction of the concrete formwork and are formed in plurality at intervals in the up-down direction.

4. 3. The support structure for a work platform according to claim 2, wherein a first corner formed by the first surface and the lower surface of the convex portion, and a second corner formed by the lower surface of the convex portion and the tip surface are curved.

5. The support structure for a work platform according to claim 2 , wherein the form body is formed in a flat plate shape.

6. 3. The support structure for a work platform according to claim 2, wherein the form body is formed in a curved plate shape.

7. 3. The support structure for a work platform according to claim 1, wherein the support member has bolt holes formed therein for connecting the work platform.

8. a concrete form installation process for installing a plurality of concrete forms of the support structure of the work platform according to claim 1 or 2 in the vertical direction and the horizontal direction, connecting the plurality of concrete forms installed in the horizontal direction with horizontal connecting members, and connecting the plurality of concrete forms installed in the vertical direction with supporting members; a reinforcing bar arrangement process for arranging reinforcing bars in a region of a predetermined height on one side of the thickness direction of the plurality of concrete formworks; a work platform installation process for fixing a work platform to the support material; an upper reinforcement step in which a worker uses the work platform to arrange reinforcing bars in an area above the area from the predetermined height; a work platform removal process of removing the work platform from the support material; A concrete pouring step of pouring concrete so as to embed the reinforcing bars.

9. 9. The method for constructing a concrete structure according to claim 8, wherein the work platform installation step, the upper reinforcement step, and the work platform removal step are repeated to further arrange reinforcing bars on the upper side before the concrete pouring step.

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