Formwork device for manufacturing column members and method for manufacturing column members

Abstract

To manufacture a precast concrete-made column member without depending on a high place work.SOLUTION: A mold device 1 for manufacturing a column member is constituted of a bottom sheathing board 2 which is installed on a bottom surface 13 of a pit 12 having a bottom surface 13 below a ground surface or a floor surface 14, and forms the bottom surface of a precast concrete-made column member, and a side sheathing board 3 for forming the side face of the column member, and the ground surface or the floor surface 14 is positioned in the periphery of the pit 12. The side sheathing board 3 is constituted of a plurality of side sheathing materials 31 that are joined to each other in a freely separable manner. Among the plurality of side sheathing boards 31, at least the two side sheathing boards 31 and 31 are made to face each other, and at least the one is made to be relatively movable in the opposite direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a formwork device for manufacturing a column member for manufacturing a precast concrete column member, and a method for manufacturing a column member using the same to manufacture a column member.

Background Art

[0002] When manufacturing a precast concrete column member, a retaining plate with an inner peripheral surface having the cross-sectional shape of the column member is assembled on the ground or on the floor surface. With the retaining plate restrained by a support from the outer peripheral side, steel bars for columns are arranged inside the retaining plate, and concrete is placed. This is a common method (see Patent Documents 1 and 2). In order to be reusable, the retaining plate is formed in a shape in which a plurality of closed cylindrical hollow members are divided in the circumferential direction.

[0003] In any case, when manufacturing the column member in an upright state, since the retaining plate and the support are erected on the ground surface or on the floor surface, it is necessary to assemble a scaffold on the ground surface or the like to a height at which an operator can perform bar arrangement work and concrete placing work at the top of the retaining plate or at the top retaining plate.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The work at the top of the retaining plate is high-altitude work and is accompanied by risks such as falling during the work. Therefore, it is essential to use safety belts or the like to avoid risks.

[0006] Based on the above background, the present invention proposes a formwork device for manufacturing a column member capable of manufacturing a precast concrete column member without relying on high-altitude work and a method for manufacturing a column member.

Means for Solving the Problems

[0007] The formwork device for manufacturing a column member according to claim 1 is installed on the bottom surface of a pit having a bottom surface below the ground surface or the floor surface, and includes a bottom formwork for forming the bottom surface of a precast concrete column member and side formworks for forming the side surfaces of the column member. The ground surface or the floor surface is located around the pit. 、 The side wall plates are composed of a plurality of side wall plate members that are detachably joined to each other. Among the plurality of side wall plate members, a joint wall plate for forming a joint portion in which a beam portion made of precast concrete connected to the upper portion of the column member is integrated is supported on at least any two of the side wall plate members positioned in directions orthogonal to each other on a plane. This is a constituent requirement.

[0008] The floor surface refers to the upper surface of a floor slab or slab such as a concrete structure that is constructed or being constructed on the ground surface, or a floor plate made of steel plate or the like that is installed temporarily. A pit is a space "having a bottom surface at a position relatively lower than the ground surface or the floor surface", on which a bottom formwork and side formworks can be installed, and the side formworks can be demolded at least within the pit so that the column member can be detached from the side formworks after the concrete hardens. However, the bottom surface of the pit does not necessarily have to be a basement floor. For example, when a scaffold or support (shoring) installed on a certain floor surface has a floor surface laid thereon, the relatively lower floor surface becomes the bottom surface of the pit.

[0009] The depth of the pit, that is, the depth from the ground surface or the floor surface to the bottom surface of the pit, does not necessarily have to be a size close to the total length of one column member. It is sufficient if the depth is such that the work on the ground surface or the floor surface located around the pit or the work above the side formworks does not become high-altitude work. Since there is a technical significance in "installing a bottom formwork and side formworks on the bottom surface at a position relatively lower than the ground surface or the floor surface", the depth of the pit may be in the range from about the total length of the column member to about one fraction of the total length in terms of the column member to be manufactured.

[0010] Since the bottom surface of the pit is located below the ground surface or the floor surface and is deep enough so that the work on the ground surface, the floor surface, or the side wall plate does not become work at height, the work such as the reinforcement arrangement of the column bars constituting the column member and the placing of concrete does not become work at height. Therefore, the risk of falling during work is avoided and the use of safety belts etc. becomes unnecessary.

[0011] The bottom plate and the side wall plates may have any form as long as they can be detached from the concrete after the concrete placed in the area surrounded by them has hardened. The side wall plate 3 For example, if a release agent is applied to the inner peripheral surface of the side wall plate 3 so that it can be detached from the concrete surface when lifting the column member after the concrete has hardened, it is conceivable that it can be formed as a single member in a cylindrical shape or the like. As shown in FIGS. 2 to 4, it is appropriate that the side wall plate 3 is composed of a plurality of side wall plate members 31 that are detachably joined to each other for the purpose of form removal (claim 1 ).

[0012] "The ground surface or the floor surface is located around the pit" means that the ground surface or the floor surface 14 (hereinafter, the floor surface 14 etc.) is located at any position around the pit 12 and is in a position facing (facing towards) the pit 12. The floor surface 14 etc. may also serve as a work floor for manufacturing the column member while checking the situation inside the pit 12. "Serving as a work floor" basically means that the floor surface 14 etc. are used as a work floor for manufacturing the column member. However, as shown in FIGS. 1 to 4, whether the floor surface 14 etc. are continuously arranged on or support the work floor 8 integrated with the upper part of the side wall plate 3 so that the work on the work floor 8 is supplemented by the floor surface 14 etc., or the work floor is directly or indirectly installed on the floor surface 14 etc. is also included.

[0013] "(Work floor) for manufacturing the column member" mainly refers to the work of placing the concrete constituting the column member in the area surrounded by the side wall plates 3 on the bottom plate 2 on the work floor. However, it may also include work such as arranging the column bars in the area surrounded by the side wall plates 3. The reinforcement arrangement work is also carried out on the bottom surface 13 of the pit 12. In addition, it may be necessary to lower a steel cage pre-assembled from column main bars 15 and shear reinforcement bars onto the bottom plate 2, and the work for that purpose or auxiliary work may be carried out on the bottom surface 13 of the pit 12 or on the floor surface 14 etc.

[0014] As shown in FIG. 3 Detachable from each other When a plurality of side wall plates 31 are combined and joined, the shape of the side wall 3 becomes a closed cylindrical shape on a plane as shown in FIGS. 1 and 4. However, the shape of one side wall plate 31 and the number of side wall plates 31 are arbitrary. In this case 、 Two adjacent side wall plates 31, 31 in the circumferential direction of the side wall 3 are detachably joined by a connecting tool such as a bolt 31b, a pin, or a clamp.

[0015] Side The side wall 3 is divided into at least two side wall plates 31. However, in order to simplify the demolding and combination operations, it is reasonable that at least any two side wall plates 31 face each other and at least one of them is movable relative to the other in the facing direction (claim 2 ). In this case, the side wall 3 is composed of, for example, two (two) plate-shaped side wall plates 31 that are orthogonal to each other, and at least one L-shaped side wall plate on a plane, or four (four) plate-shaped side wall plates 31. When the side wall 3 is, for example, cylindrical, the side wall plate 31 is formed in a curved plate shape.

[0016] When at least any two side wall plates 31, 31 face each other and are movable (claim 2 ), the movable side wall plate 31 is, for example, a wheel (roller) 6 connected (pivotally supported) to its lower end or the like rolls on the bottom surface 13 of the pit 12, or as shown in FIGS. 3 and 4, the lower end (slide member 4) of the side wall plate 31 slides on a wheel 6 pivotally supported by a rail 5 laid on the bottom surface 13 of the pit 12 to be movable. When using the wheel 6, the frictional force generated at the lower end (slide member 4) of the side wall plate 31 is reduced, so the movement of the side wall plate 31 becomes smooth, and the work efficiency of demolding and subsequent reassembly is improved.

[0017] including the case where at least any two side wall plate members 31, 31 face each other and are movable (Claim 2), Among the plurality of side retaining plates 31, a joint retaining plate 9 for forming a joint portion in which a beam portion made of precast concrete connected to the upper portion of the column member is integrated is supported on at least any two side retaining plates 31 positioned in directions orthogonal to each other on a plane (Claim 1 ). "At least any two side retaining plates" are two side retaining plates 31 orthogonal to each other if the column member is a corner column, three side retaining plates 31 if it is a side column, and four side retaining plates 31 if it is a middle column.

[0018] The joint retaining plate 9 supports the ends of the beam reinforcing bars constituting the beam member connected to the upper portion of the column member, partitions the placement area of the concrete constituting the beam portion (joint portion) which is a part of the beam member, and serves as a retaining plate for forming the beam portion.

[0019] Claim 1 or Claim 2 When using the formwork device for manufacturing a column member described in claim 1, a step of arranging column reinforcing bars for constituting a precast concrete column member in a region surrounded by a bottom retaining plate 2 and side retaining plates 3 installed on the bottom surface 13 of a pit 12 having a bottom surface 13 below the ground surface or the floor surface 14, and a step of placing concrete for constituting the column member in the region surrounded by the side retaining plates 3 on the bottom retaining plate 2 from above the ground surface around the pit 12 or above the floor surface 14, and then the column member is manufactured (Claim 3 )

[0020] Side The retaining plate 3 is composed of a plurality of side retaining plates 31 that are detachably joined to each other. Also, among the plurality of side retaining plates 31, at least On a plane any two of the side retaining plates 31, 31 positioned in orthogonal directions support a joint retaining plate 9 for forming a joint portion in which a beam portion made of precast concrete connected to the upper portion of the column member is integrated 、 A column member with a joint portion is manufactured through a step of arranging beam reinforcing bars for constituting the joint portion in the region surrounded by the joint retaining plate 9 and a step of placing concrete in the region surrounded by the joint retaining plate 9 (Claim 3)。The concrete is placed simultaneously inside the side formwork 3 on the bottom formwork 2 and inside the access formwork 9 placed thereon, and the beam reinforcement bars inside the access formwork 9 are embedded in the concrete.

Advantages of the Invention

[0021] The formwork device for manufacturing column members is installed on the bottom surface of a pit having a bottom surface below the ground surface or the floor surface, and includes a bottom formwork for forming the bottom surface of a precast concrete column member and a side formwork for forming the side surface of the column member. Since the bottom surface of the pit is located below the ground surface or the floor surface, the work of arranging the column reinforcement bars and placing the concrete that make up the column member can be completed without performing high-altitude work. As a result, the risk of falling during work can be avoided, and the use of safety belts and the like can also be made unnecessary.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Embodiments for Carrying Out the Invention

[0023] FIGS. 1-(a) and (b) show a state where a formwork device 1 for a column member, which is installed on the bottom surface 13 of a pit 12 having a bottom surface 13 below the ground surface or the floor surface 14 and includes a bottom formwork plate 2 for forming the bottom surface of a precast concrete column member and a side formwork plate 3 for forming the side surface of the column member, is installed on the bottom surface 13 of the pit 12. The ground surface or the floor surface (hereinafter, the floor surface 14, etc.) is located around the pit 12 and faces the pit 12.

[0024] The side formwork plate 3 may be formed of a single member such as a cylindrical shape. However, in FIGS. 1 and 2, for the purpose of ensuring the demolding work and improving the work efficiency of demolding, an example is shown in which the side formwork plate 3 is composed of a plurality of side formwork plate members 31 that are detachably joined to each other at a part in the circumferential direction. In FIG. 1 in particular, for the purpose of improving the work efficiency of demolding and subsequent reassembly of each side formwork plate member 31, at least two of the plurality of side formwork plate members 31 are opposed to each other in the horizontal direction, and at least one of them is movable relative to the opposing direction.

[0025] In FIGS. 1 and 2, the side formwork plate 3 is divided into four (4) plate-like side formwork plate members 31, and each side formwork plate member 31 is installed on the bottom surface 13 of the pit 12 so as to be reciprocally movable on the bottom surface. Specifically, as shown in FIGS. 3 and 4, rails 5 are fixed in the reciprocating direction of each side formwork plate 31 directly on the bottom surface 13 or on a bottom plate installed on the bottom surface 13 (hereinafter, on the bottom surface 13, etc.) for ensuring stability, and a slide member 4 that is reciprocally movable in the axial direction of the rail 5 is supported by the rail 5 along the rail 5, so that each side formwork plate member 31 is reciprocally movable in one direction.

[0026] As shown in FIGS. 3-(b) and 2-(b), the rails 5 are fixed on the bottom surface 13 below the bottom sill plate 2 and the like so that each side sill plate 31 can be demolded from the hardened concrete. FIG. 3 shows the state in which the four divided side sill plates 31 are separated from each other and demolded, and FIG. 4 shows the state in which the side sill plates 31 are joined to each other to form the side sill 3.

[0027] In the example shown in FIG. 3 in which the side sill 3 is divided into four parts, the rails 5, 5 are fixed on the bottom surface 13 or the like facing two orthogonal directions on the plane. Since the orthogonal rails 5, 5 intersect each other under the bottom sill plate 2 as shown in FIG. 3-(a), they are laid on the bottom surface 13 or the like with a step up and down as shown in FIG. 3-(b). The lower rail 5 is fixed on the bottom surface 13 or the like, and the upper rail 5 is fixed to the lower rail 5. In the drawing, in order to stabilize both axial ends of the upper rail 5, support members 7 having the same height as the lower rail 5 are arranged under both axial ends of the upper rail 5, and the upper rail 5 is also fixed to and supported by the support members 7. The rails 5, 5 in each direction are arranged in parallel with a distance from each other in order to stably support the side sill plates 31.

[0028] The method of supporting the slide member 4 to be reciprocally movable on the rail 5 is arbitrary. In the examples shown in FIGS. 3 and 4, wheels (rollers) 6, 6 are pivotally supported at at least two positions spaced apart in the axial direction of the rail 5, and the slide member 4 is supported by these two wheels 6, 6, so that the slide member 4 is supported on the rail 5 to be reciprocally movable in its axial direction. In addition, the illustrated wheels 6 can be miniaturized and arranged in pairs vertically inside the rail 5 at the positions of the illustrated wheels 6.

[0029] The two wheels 6, 6 are pivotally supported on both sides of the section where the slide member 4 reciprocates along the rail 5, for example, with the axes facing the horizontal direction or the like. When viewed in plan, as shown in FIG. 3-(a), the wheels 6, 6 are arranged at both axial end positions of the rail 5 and at positions overlapping the bottom sill plate 2. The wheel 6 may be pivotally supported with the axis facing the vertical direction.

[0030] The axial direction of the rail 5, or the direction of the straight line connecting the axes of at least two wheels 6, 6, may be horizontal, but in the examples shown in FIGS. 3 and 4, it is inclined upward from the outer peripheral side to the central side of the bottom plate 2 to facilitate the demolding operation of the side plate members 31. In this case, it is possible to move the side plate members 31 by simply applying a slight force to the outer peripheral side of the bottom plate 31 when demolding. Conversely, if the axial direction of the rail 5 or the like is inclined downward from the outer peripheral side to the central side of the bottom plate 2, the reassembly work from the demolded state can be facilitated.

[0031] The slide members 4 are fixed (joined) in two parallel lines at a horizontal distance corresponding to the arrangement of the rails 5, 5, attached to the lower part of each side plate member 31. As shown in FIGS. 3-(a), 4-(b), and 4-(c), each slide member 4 is arranged on one side in the width direction of each rail 5 that supports it. Each slide member 4 reciprocates while being supported by at least two wheels 6, 6 of each rail 5 between the separated state shown in FIG. 3-(a) and the joined state shown in FIG. 4-(a).

[0032] In the drawings, for the purpose of ensuring the bending rigidity and torsional rigidity of the rail 5, a steel material (square steel pipe) with a closed cross-sectional shape having both axial ends closed is used for the rail 5, and the wheels 6 are pivotally supported outside the rail 5, but the cross-sectional shape of the rail 5 and the pivotal support position of the wheels 6 are not limited. In the relationship where the slide member 4 holds the wheels 6 sandwiched from above and below, a steel material (H-shaped steel) with an open cross-sectional shape having both axial ends closed is used for the slide member 4, but the cross-sectional shape of the slide member 4 is also not limited.

[0033] As shown in FIGS. 3-(a) and (b), each side wall plate 31 is arranged on two parallel slide members 4, 4 and joined to both slide members 4, 4 to be integrated. When the four-part side wall plate 31 transitions from the separated state shown in FIG. 3-(a) to the joined state shown in FIG. 4-(a), it forms a closed side wall plate 3 on the plane. At this time, for example, the flanges 31a, 31a integrated on both sides in the width direction of the side wall plate 31 overlap each other between two adjacent (orthogonal) side wall plates 31, 31, and nuts are fastened to bolts 31b passing through both flanges 31a, 31a, so that they are joined to be separable from each other.

[0034] In the illustrated example, one of the overlapping flanges 31a, 31a is, for example, a portion protruding from the main body portion of the side wall plate 31 to both sides in the width direction, and the other is a portion bent vertically from both sides in the width direction of the main body portion of the side wall plate 31. In the drawing, as shown in FIG. 3, a pin 31c that fits into the hole of the other bent flange 31a protrudes from one flange 31a protruding from the main body portion, and by inserting the pin 31c into the hole of the adjacent side wall plate 31, two orthogonal side wall plates 31, 31 are positioned.

[0035] In the drawing, an operation floor 8 that projects toward the side such as the floor surface 14 is integrally joined to the upper part of each side wall plate 31. When the operation floor 8 integrated with the four side wall plates 31 forms the side wall plate 3 as shown in FIGS. 4-(a) and 1-(a), it can be used as a floor for operations such as arranging column reinforcing bars and placing concrete for manufacturing column members while leaving the upper part of the side wall plate 3 open and butting or overlapping each other in the circumferential direction. The floor surface 14 etc. located around the pit 12 are used to assist operations on the operation floor 8 or for operations continuous with the operations on the operation floor 8.

[0036] The reinforcement work of the column main bars 15 and the shear reinforcement bars (hoops) 16 shown in Fig. 1-(a) and Fig. 2-(a) that make up the column member is also carried out on the bottom surface 13 of the pit 12, etc. However, in order to improve the work efficiency of the reinforcement, it is reasonable to lower the reinforcement cage assembled from the column main bars 15 and the shear reinforcement bars 16 from above while adjusting the position on the work floor 8, the floor surface 14, etc. The placement of concrete into the side formwork 3 on the bottom slab 2 is also carried out on the work floor 8 or the floor surface 14, etc. as shown in Fig. 5, while adjusting the placement position and applying vibration.

[0037] Fig. 5 shows the situation when placing concrete in the formwork device 1A in which the joint plate 9 for integrally forming the joint (connection part) with the beam member connected to the column member is placed on the formwork device 1 composed of the bottom slab 2 and the side formwork 3 shown in Figs. 3 and 4, and the joint plate 9 is aligned with the bottom slab 2 and the side formwork 3. When the formwork device 1 is composed of the bottom slab 2 and the side formwork 3, the concrete is placed from above the side formwork 3.

[0038] Fig. 6-(c) shows a configuration example of the joint plate 9. The joint plate 9 is placed on the upper part of the formwork device 1 composed of the bottom slab 2 and the side formwork 3 and can be connected to it. The form (configuration) can be arbitrary as long as it has a structure that allows the reinforcement of the column bars and the beam bars at the joint part. However, in Fig. 6, it is in a form considering the reinforcement work of the beam main bars 17 passing through the joint part as shown in Fig. 8.

[0039] Specifically, as shown in Fig. 6-(b), at the four corners on the plane, the four divided corner plate materials 91 that make up the joint plate 9 are arranged, and as shown in (c), the lower plate material 92 with a receiving member 93 for receiving the beam main bars 17 is straddled between the adjacent corner plate materials 91, 91. On the upper receiving member 93, an upper plate material 94 paired with the lower plate material 92 is arranged as shown in Fig. 8-(d). In Fig. 6, in order to regularly and efficiently assemble the constituent members of the plurality of divided joint plates 9, each constituent member is arranged on the bed 95 as a ruler installed on the bottom surface 13, etc.

[0040] The formwork device 1 consisting of the bottom weir plate 2 and the side weir plate 3 is placed on the upper part of the formwork device 1. As shown in Fig. 5, concrete is placed in the side weir plate 3 and the formwork weir plate 9. At the upper part of the completed column member, a joint part where a beam is connected is integrated. However, depending on the arrangement position of the column member, such as whether it is a side column or a middle column, the shape and width of the beam connected to the joint part may differ for each column member.

[0041] In this regard, in Figs. 6 and 8, as shown in Fig. 7 for making the surface side of the column member recessed relative to the joint part so that the concrete in the joint part can be placed deeper (projected) than the surface of the column member, the nussmi weir plate 10 as shown in Fig. 7 is arranged inside the corner weir plate material 91 as shown in Fig. 6-(c) and Fig. 8-(d). After placing the concrete with the nussmi weir plate 10 arranged, the surface of the joint part of the column member is finished in a state of protruding toward the beam side from the surface of the part other than the joint part.

[0042] Fig. 6-(c) shows a state where the corner 10a of the nussmi weir plate 10 shown in Fig. 7 and the lower part 10b spanning between the lower parts of the adjacent corners 10a, 10a are arranged inside the corner weir plate material 91. The upper part 10c spanning between the upper parts of the adjacent corners 10a, 10a, which is the remaining part of the nussmi weir plate 10, is arranged after the reinforcement bars of the beam are arranged as shown in Fig. 8-(d).

[0043] Figs. 8-(a) to (f) show the procedure for arranging the reinforcement bars of the beam using the formwork weir plate 9 shown in Fig. 6-(c). Fig. 8-(a) shows a state where the upper and inner beam main reinforcement bars 17 and shear reinforcement bars (stirrups) 18 in one direction of the beam, and the shear reinforcement bars (hoops) 16 around the column main reinforcement bars 15 in the joint part are arranged. (b) shows the state where the lower beam main reinforcement bars 17 are arranged. (c) shows the state where the upper and lower beam main reinforcement bars 17 and shear reinforcement bars 18 of the beam in the orthogonal direction are arranged. Although the column main reinforcement bars 15 and the shear reinforcement bars 16 do not appear in Fig. 8-(a), as shown in Fig. 1-(a) and Fig. 2-(a), the column main reinforcement bars 15 and the shear reinforcement bars 16 are arranged in the state shown in Fig. 8-(a).

[0044] Figure 8-(d) shows the state where the upper retaining plate material 94 of the access retaining plate 9 and the upper part 10c of the nussimi retaining plate 10 are arranged. (e) shows the state where a protective material 11 having a cap for protecting the column main reinforcement 15 of the column member arranged inside the side retaining plate 3 from the concrete to be placed later is installed on the upper retaining plate material 94, indicating the state where the assembly and reinforcement of the access retaining plate 9 are completed. (f) shows the state when (e) is viewed from another angle.

[0045] The concrete placement situation when the access retaining plate 9 is placed on the upper part of the formwork device 1 composed of the bottom retaining plate 2 and the side retaining plate 3 as described above is shown in FIG. 5. However, when placing on the upper part of the formwork device 1 of the access retaining plate 9 after the completion of the beam reinforcement arrangement shown in FIG. 8-(f), the bed 95 shown in FIGS. 6 and 8 is removed, and the space inside the formwork device 1 and the space inside the access retaining plate 9 communicate with each other.

Explanation of Reference Numerals

[0046] 1... formwork device (for manufacturing column members), 1A... formwork device (with access retaining plate 9), 2... bottom retaining plate, 3... side retaining plate, 31... side retaining plate material, 31a... flange, 31b... bolt, 31c... pin, 4... slide material, 5... rail, 6... wheel (roller), 7... support material, 8... work floor, 9... access retaining plate, 91... corner retaining plate material, 92... lower retaining plate material, 93... receiving material, 94... upper retaining plate material, 95... bed, 10... nussimi retaining plate, 10a... corner, 10b... lower part, 10c... upper part, 11... protective material, 12... pit, 13... bottom surface, 14... floor surface, 15... column main reinforcement, 16... shear reinforcement (hoop), 17... beam main reinforcement, 18... shear reinforcement (star lap).

Claims

1. A base slab for forming the bottom surface of a precast concrete column member, which is installed on the bottom surface of a pit having a bottom surface below the ground surface or the floor surface, and side slabs for forming the side surfaces of the column member, The ground surface or the floor surface is located around the pit, The side slabs are composed of a plurality of side slab members that are detachably joined to each other, Among the plurality of side slab members, a joint slab for forming a joint portion in which a precast concrete beam portion connected to the upper portion of the column member is integrated is supported on at least any two of the side slab members located in directions orthogonal to each other on a plane. A formwork device for manufacturing a column member, characterized in that.

2. Among the plurality of side slab members, at least any two of the side slab members face each other, and at least one of them is movable relative to the facing direction. The formwork device for manufacturing a column member according to claim 1, characterized in that.

3. A step of arranging column reinforcing bars for forming a precast concrete column member in a region surrounded by the base slab and the side slabs installed on the bottom surface of a pit having a bottom surface below the ground surface or the floor surface, A method for manufacturing a column member, including a step of placing concrete for forming the column member in a region surrounded by the side slabs on the base slab from above the ground surface or the floor surface around the pit, The side slabs are composed of a plurality of side slab members that are detachably joined to each other, Among the plurality of side slab members, a joint slab for forming a joint portion in which a precast concrete beam portion connected to the upper portion of the column member is integrated is supported on at least any two of the side slab members located in directions orthogonal to each other on a plane, A step of arranging beam reinforcing bars for forming the joint portion in a region surrounded by the joint slab, And a step of placing concrete in a region surrounded by the joint slab, A method for manufacturing a column member, characterized by manufacturing the column member with the mouth portion.

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