Formwork for forming a reinforced concrete composite member

Abstract

To provide a formwork for forming a reinforced concrete member which makes it possible to simplify construction.SOLUTION: A formwork for forming a reinforced concrete composite member comprises formwork bodies K1, K2 formed so as to fill a gap between a recess 13 formed in a reinforced concrete member 11 and a beam member 20 arranged in the recess, and the formwork body is formed into a shape that follows an external form of the beam member.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a formwork for forming a reinforced concrete composite member.

Background Art

[0002] A construction method is known in which a beam formed of a steel frame is integrated with a member formed of reinforced concrete to form a composite member. According to this construction method, a columnar reinforced concrete member is formed in advance as a precast member (PCaRC member), and an H-shaped steel beam is joined to this member. At the joint between the PCaRC member and the H-shaped steel beam, after installing a formwork for closing the opening generated between the PCaRC member and the H-shaped steel beam, the gap between the PCaRC member and the H-shaped steel beam is filled with concrete to integrate the PCaRC member and the H-shaped steel beam. The formwork for closing the opening generated between the PCaRC member and the H-shaped steel beam is processed according to the shape of the H-shaped steel beam.

[0003] This formwork for closing is fixed to the above-mentioned opening with a separator or a wire. In the process of fixing the formwork for closing, the operator has to work in a narrow space, resulting in reduced efficiency. In addition, it is necessary to cure with a crosspiece or the like so as not to damage the PCaRC member during the installation of the formwork for closing, which requires labor. In the construction of a building using this composite member, the man-hours for installing the formwork for closing may account for about 1 / 4 of the total man-hours.

[0004] In relation to this, Patent Document 1 describes a formwork for closing used for filling concrete at the joint of a composite member. The formwork is formed so as to cover the gap generated between the lower end of a precast concrete member formed by a steel frame beam and a reinforced concrete column integrally formed with the steel frame beam, and the upper end of a column body formed of reinforced concrete. The formwork includes, for example, a closing plate portion formed so as to close the gap, and a hook portion that engages with the lower flange of the steel frame beam.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-008603 [Summary of the Invention] [Problems to be Solved by the Invention]

[0006] According to the technique described in Patent Document 1, since a formwork for closing is attached using a large number of bolts and nuts, it is time-consuming. Further, when attaching in a narrow place, there is a risk that workability may decrease. The inventors have repeatedly improved the formwork for closing and the method of installing the formwork in the construction of reinforced concrete composite members.

[0007] An object of the present invention is to provide a formwork for forming a reinforced concrete composite member that can simplify construction. [Means for Solving the Problems]

[0008] In order to achieve the above object, the present invention includes a formwork body formed so as to close between a recess formed in a reinforced concrete member and a beam member disposed in the recess, and the formwork body is formed in a shape along the outer shape of the beam member. It is a formwork for forming a reinforced concrete composite member.

[0009] Further, in the present invention, the formwork body may be divided around the beam member.

[0010] Further, the present invention may include a sheet-like adhesive attached between the formwork body and the reinforced concrete member. [Effects of the Invention]

[0011] According to the present invention, it is possible to simplify the installation of the formwork in the joining of the reinforced concrete member and the beam member. [Brief Description of the Drawings]

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of a formwork for forming a reinforced concrete composite member according to the present invention and a formwork installation method in the joining of the reinforced concrete member and the beam member will be described with reference to the drawings.

[0014] The reinforced concrete composite member is, for example, a composite member pre-formed by a precast method. By joining the reinforced concrete composite members vertically with an adhesive or concrete, a structure such as a building is constructed.

[0015] As shown in FIG. 1, the reinforced concrete composite member is formed by joining a reinforced concrete member 10 formed of reinforced concrete and a second beam member 20 formed of steel by concrete.

[0016] The reinforced concrete member 10 includes a column body 11 formed of reinforced concrete and a first beam member 15 integrally joined to the column body 11. The first beam member 15 is, for example, a beam member formed of H-shaped steel.

[0017] The column body 11 is a member used for a column that receives a vertical compressive load of a building. The column body 11 is formed, for example, in a columnar shape with a rectangular cross-section. The column body 11 is formed to extend in the vertical direction. Reinforcing bars 12 are arranged inside the column body 11. A first beam member 15 arranged along the horizontal direction is integrally formed to penetrate the column body 11. The first beam member 15 is arranged before the placement of the concrete forming the column body 11 and is integrated with the column body 11 after the placement of the concrete. The first beam member 15 is arranged offset to one side surface 11A side of the column body 11.

[0018] A concave portion 13 that is recessed in a concave shape is formed in the column body 11. The concave portion 13 is formed in a cubic space. The concave portion 13 forms an opening continuous with the other side surface 11B and the upper surface 11C of the column body 11. The concave portion 13 is formed to have a size capable of accommodating the cross-sectional shape of a second beam member 20 described later when viewed from the other side surface 11B side. An end portion of the second beam member 20 is inserted into the concave portion 13 as described later. When inserted into the concave portion 13, a gap is formed between the second beam member 20 and the concave portion 13. The gap formed between the second beam member 20 and the concave portion 13 is filled with concrete. When the concrete hardens, the second beam member 20 is integrated with the column body 11. That is, the second beam member 20 is joined to the column body 11 via the hardened concrete.

[0019] Next, a method for forming the reinforced concrete composite member 1 will be described.

[0020] As shown in FIG. 2, the end portion 21 of the second beam member 20 is arranged in the concave portion 13 formed in the reinforced concrete member 10. The second beam member 20 is arranged in a state of protruding along the horizontal direction from the other side surface 11B side in the concave portion 13. A gap T is formed between the concave portion 13 and the second beam member 20. When the reinforced concrete member 10 is viewed from the other side surface 11B side, the second beam member 20 is accommodated in the opening 13A of the concave portion 13. The opening 13A of the concave portion 13 is closed by a formwork as described later.

[0021] As shown in Fig. 3, in the other side surface 11B, a region 11R with a predetermined width along the opening 13A serves as an adhesive surface of the formwork as will be described later. The region 11R is cleaned to improve the adhesive force of the adhesive S. The adhesive S is temporarily fixed to the region 11R. The adhesive S is formed in a sheet shape with a predetermined width. The adhesive S is, for example, a hot melt adhesive that melts by heating.

[0022] As shown in Fig. 4, the opening 13A is closed by a pair of formworks K1, K2. The pair of formworks K1, K2 are formed in a shape obtained by die-cutting the cross-sectional shape of the second beam member 20. The formworks K1, K2 are formed so as to close the gap T between the second beam member 20 protruding from the recess 13 and the recess 13. The formworks K1, K2 are formed in a plate shape, for example, by a plywood such as a concrete panel.

[0023] The formworks K1, K2 are formed with first cutout portions K1A, K2A that accommodate, for example, the upper flange portion 22 of the second beam member 20. The first cutout portions K1A, K2A are cut out in a rectangle along the horizontal direction. The formworks K1, K2 are formed with second cutout portions K1B, K2B that accommodate, for example, the lower flange portion 23 of the second beam member 20. The second cutout portions K1B, K2B are cut out in a rectangle along the horizontal direction.

[0024] The formworks K1, K2 are formed with third cutout portions K1C, K2C that accommodate, for example, the web 24 of the second beam member 20. The third cutout portions K1C, K2C are cut out in a rectangle along the vertical direction. The formworks K1, K2 are formed larger than the gap T. The formworks K1, K2 are formed so that their peripheries overlap the region 11R.

[0025] The sheet-shaped adhesive S is attached to the region 11R. The adhesive S may be adhered to the region 11R. The formworks K1, K2 are fitted on both sides of the end portion 21 of the second beam member 20 so as to close the gap T. The adhesive S is sandwiched between the other side surface 11B of the column body 11 and the formworks K1, K2. In this state, the formworks K1, K2 are positioned.

[0026] After the molds K1 and K2 are positioned, the adhesive S is heated and melted. Heat is applied to the adhesive S from the surface sides of the molds K1 and K2 along the position of the region 11R using a heater (not shown). The adhesive S is heated and melted by the heater.

[0027] When the heating by the heater is stopped and the adhesive S cools and hardens, the molds K1 and K2 are surely adhered to the reinforced concrete member 10.

[0028] On the joint surfaces between the molds K1 and K2, the backing plates K3 and K4 are attached using nails or the like and cured. By the backing plates K3 and K4, when concrete is placed in the recess 13 as described later, it is possible to prevent the concrete from spraying out from the joint surface between the molds K1 and K2.

[0029] As shown in FIG. 6, a plurality of fixing members Y are fixed to the flange portions 22 and 23 of the second beam member 20 so as to restrict the movement of the molds K1 and K2 in the direction away from the column body 11. The fixing member Y is, for example, a C-shaped clamp.

[0030] After a plurality of fixing members Y are fixed, the recess 13 (see FIG. 1) closed by the molds K1 and K2 is filled with concrete. By the fixing member Y, it is possible to prevent the molds K1 and K2 from bulging outward due to the pressure of the concrete. When the concrete filled in the recess 13 hardens, a reinforced concrete joint portion filled between the recess 13 and the end portion 21 of the second beam member 20 is formed. Thereby, a reinforced concrete composite member 1 in which the column body 11 (reinforced concrete member 10) and the second beam member 20 are integrated is formed.

[0031] After the concrete has hardened, the fixing member Y and the backing plates K3 and K4 are removed. Thereafter, a heater is applied to the position corresponding to the bonding surface (region 11R) on the outer side of the formworks K1 and K2 (the surface on the side opposite to the concrete placing surface), and an alternating magnetic field is applied to melt the adhesive S. After the adhesive S has melted, the formworks K1 and K2 are removed from the column body 11. By the above-described steps, the second beam member 20 is joined to the reinforced concrete member 10, and the reinforced concrete composite member 1 is formed.

[0032] As described above, according to the formwork installation method in the joining of the reinforced concrete member and the beam member, the steps related to the attachment and removal of the formworks K1 and K2 that close the space between the recess 13 formed in the column body 11 and the second beam member 20 can be reduced. According to the joining method of the reinforced concrete member and the beam member, since the formworks K1 and K2 can be easily attached even in a narrow place, the working efficiency can be improved.

[0033] According to the formwork installation method in the joining of the reinforced concrete member and the beam member, by using the sheet-like adhesive S for the adhesion between the formworks K1 and K2 and the column body 11, the workability is improved. According to the formwork installation method in the joining of the reinforced concrete member and the beam member, since the adhesive S hardens when cooled to a predetermined temperature after heating, the working time is shortened. According to the joining method of the reinforced concrete member and the beam member, after the concrete is filled, when the adhesive S is heated from the surface of the formworks K1 and K2, the adhesive S melts, so that the formworks K1 and K2 can be demolded without damaging the reinforced concrete member 10.

[0034] As described above, one embodiment of the present invention has been described. However, the present invention is not limited to the above-described one embodiment, and can be appropriately changed without departing from the gist thereof. For example, a hot melt may be applied to the region 11R and heated to melt after the formworks K1 and K2 are attached. As the adhesive, other adhesives than the hot melt may be used.

Explanation of reference numerals

[0035] 1 Reinforced concrete composite member, 10 Reinforced concrete member, 11 Column body, 11A One side surface, 11B The other side surface, 11C Upper surface, 11R Region, 12 Reinforcement, 13 Recess, 13A Opening, 15 First beam member, 20 Second beam member, 21 End portion, 22, 23 Flange portion, 24 Web, K1, K2 Formwork, K1A, K2A First notch portion, K1B, K2B Second notch portion, K1C, K2C Third notch portion, K3, K4 Backup plate, S Adhesive, T Gap, Y Fixing member

Claims

1. A formwork body is provided which closes the space between a recess formed in a reinforced concrete member and a beam member disposed in the recess, the formwork body being formed in a shape along the outer contour of the beam member, and a sheet-like adhesive that is heated and melted is provided between the formwork body and the reinforced concrete member. A formwork for forming a reinforced concrete composite member.

2. The formwork body is divided around the beam member. A formwork for forming the reinforced concrete composite member according to Claim 1.

Images