JP2014234698A - Construction method of joint material and joint material support structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a joint material and a joint material support structure, capable of preventing positional deviation, by highly accurately arranging the joint material.SOLUTION: A construction method 1 of the joint material is a construction method of the joint material for constructing an expansion joint 3 in a joining part of a plurality of mutual concrete wall-like members 2, and comprises a process of penetrating mutual forms in a state of sandwiching the joint material from both surfaces by a connection member 6 for connecting the pair of mutual forms, by arranging the joint material 5 in the wall thickness direction of the pair of forms, by erecting the pair of forms 4 in both side surface positions of the concrete wall-like members, a process of erecting a presser member allowed to abut on the connection member 7, a process of placing concrete between the pair of forms, a process of removing the presser member and the connection member and a process of disassembling the pair of forms.

Description

  The present invention relates to a joint material construction method in which joint material is driven into concrete to form a stretch joint, and a support structure for the joint material.

  Conventionally, reinforced concrete structures such as bridge piers and retaining walls can be cracked due to the effects of cement hydration heat, outside air temperature, etc., or due to large-scale earthquakes causing the structure to be greatly damaged and deformed. there were. As a method of reducing and suppressing the occurrence of cracks, an expansion joint that allows shrinkage deformation of concrete has been provided in advance at a specific concrete cross-section position.

  This expansion joint is constructed in the following procedure, for example. First, in order to construct a concrete wall-like structure such as a retaining wall, a pair of wall molds are built at positions on both side surfaces of the retaining wall. At that time, joint materials are arranged in the wall thickness direction between the pair of wall molds in order to divide the retaining wall at predetermined intervals. Next, concrete is placed between the wall forms to construct a retaining wall. Thereafter, the expansion joint is formed by injecting the filler into the gap portion from which the joint material has been removed, or by driving the joint material into the concrete frame.

  Conventionally, as a method of fixing a joint material to a formwork, a joint material is arranged in the wall thickness direction of the wall formwork, and the joint material body is protruded into the wall formwork and fixed (Patent Document 1). Or a method of fixing a cement plate integrated with a joint material in a wall mold (see Patent Document 2), or fixing a thin sheet material to a joint material, and using the sheet material as a wall mold There is a method of fixing inside (see Patent Document 3).

JP 2000-110349 A JP 2005-3099 A Japanese Patent No. 3357854

However, the methods of Patent Documents 1 and 2 are methods of fixing the joint material body and the cement plate attached to the joint material in the wall formwork, and dismantling the wall formwork and then fixing it to the wall formwork. It was necessary to cut off the joint material and cement board that had been used.
Moreover, the method of patent document 3 is a method of fixing the sheet material integrated with the joint material to the wall formwork to make the joint material self-supporting, and a large lateral pressure acts when the concrete placement position is high. There was a problem that the jointing material was inclined from the position where it was built.

  The present invention provides a joint material construction method and joint material support structure capable of arranging joint materials at predetermined positions with high accuracy when forming stretch joints in a concrete wall-like structure and preventing misalignment. The purpose is to provide.

  The joint material construction method according to claim 1 (for example, joint material construction method 1 to be described later) is provided with an expansion joint (for example, a joint portion between a plurality of concrete wall members (for example, retaining wall 2 to be described later)). , A joint material construction method for constructing a stretch joint 3), which will be described later, wherein a pair of molds (for example, a mold 4 described later) are installed at both side surface positions of the concrete wall-shaped member, A joint material (for example, joint material 5 described later) is arranged in the wall thickness direction of the mold frame, and the joint material is connected from both sides by a connecting member (for example, a connecting member 6 described later) that connects the pair of mold frames to each other. A step of penetrating the molds in a sandwiched state, a step of erecting a pressing member (for example, a pressing member 7 described later) abutted against the connecting member, and a pair of the molds A step of placing concrete in between, the pushing member and A step of removing the serial connection member, characterized in that it comprises a step of dismantling the pair of mold.

  The joint material support structure according to claim 2 is a joint material support structure in which the joint material is supported by the formwork of the joint portion between the concrete wall members, and the joint material support structure is disposed at both side surface positions of the concrete wall member. A pair of molds, a joint material disposed in the wall thickness direction between the pair of molds, a pair of connecting members that penetrate the pair of molds and sandwich the joint plate from both sides, and the connecting members And a pair of pushing members that are erected in contact with each other.

  According to this invention, a pair of wall molds are built in both side surface positions of the concrete wall-shaped member, joint materials are arranged in the wall thickness direction of the wall mold frames, and the joint materials are paired with each other. And a pair of pressing members arranged in contact with the connecting member. Therefore, even if the joint material is pushed by the ready-mixed concrete during placement and the joint material is deformed to cause a displacement, the joint material is composed of a connecting member sandwiched from both sides and a holding member arranged to prevent the connecting member from bending. Since it is supported by the wall formwork, the joint material can be prevented from being displaced.

  Further, since the joint material is attached to the pair of wall molds while being sandwiched by the connecting members from both sides, the joint material can be placed at a predetermined position with high accuracy, and the joint material is predetermined between the mold frame and the joint material. The cover thickness of concrete can be secured.

  According to the present invention, the concrete wall-like member is constructed by installing a pair of wall molds at both side surface positions, arranging the joint material in the wall thickness direction of the wall mold, and connecting the joint material with the connecting member. Concrete is cast in a state where it is supported by a pressing member. Even after the concrete is cast, the connecting member and the pressing member can be removed from the outside of the formwork, and the concrete can be cast continuously.

  Specifically, immediately after placing the concrete between the wall molds, with the joint material body left in the concrete housing, the connecting member supporting the joint material is pulled out from the side of the mold, The holding member is pulled out from the upper direction, and an expansion joint is formed in the concrete wall structure.

  In addition, immediately after placing the concrete in the mold, the connecting member and the holding member that fixed the joint material are pulled out from the outside of the mold, so that the temporary construction material is not left inside the concrete and the high-quality concrete structure. You can build things. Moreover, the connection member and the pressing member can be used repeatedly to reduce the temporary material cost.

According to the present invention, a pair of wall molds are built at both side surface positions of a concrete wall member, joint materials are arranged in the wall thickness direction of the wall mold frames, and the joint materials are connected to each other. The connecting member is sandwiched from both sides, and a pair of pressing members are disposed in contact with the connecting member. Therefore, even if the joint material is pushed by the ready-mixed concrete when placing concrete, the connecting member and the pressing member supported by the wall formwork are positioned as the joint material and arranged as a stiffener for self-supporting, Inclination and displacement of joint materials can be prevented.
In addition, the connecting member and the pressing member arranged to sandwich the joint material from both sides can be removed from the outside of the mold even after the concrete is placed, so that continuous concrete placement is possible, in a short time, In addition, a high-quality concrete wall member can be constructed.

It is a perspective view of the expansion-contraction joint constructed | assembled by the construction method of the joint material which concerns on one Embodiment of this invention. It is a flowchart of the construction method of the joint material which concerns on the said embodiment. It is a disassembled perspective view for demonstrating the construction method of the joint material which concerns on the said embodiment. It is a top view sectional view for explaining a construction method of a joint material concerning the embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an expansion joint 3 constructed by a joint material construction method 1 according to an embodiment of the present invention.

  The joint material 5 is arranged in the wall thickness direction of the retaining wall 2 in order to form the expansion joint 3 at the joint portion between the retaining wall 2A as a plurality of reinforced concrete structures and the retaining wall 2B.

The joint material construction method 1 will be described with reference to FIGS. 3 and 4 along the flowchart of FIG. 2.
First, in step S <b> 1, the mold 4 </ b> A is built only at one side of the pair of wall molds covering the wall surface at the positions of both side surfaces of the retaining wall 2. A separator 6 as a connecting member, a single tube 10, and a mold clamping metal fitting 11 are attached to the mold 4A.

In step S <b> 2, the vertical bars 13 and the horizontal bars 12 are arranged as the wall bars of the retaining wall 2.
In step S3, the joint material 5 is attached to the wall mold 4A in the wall thickness direction between the wall molds covering both side surfaces of the retaining wall 2. At this time, the horizontal bars 12 of the wall bars are cut so that the concrete cover thickness can be secured with respect to the joint material 5.

The joint material 5 is formed of a resin foam molded product or a cement board. The length of the joint material 5 in the short side direction (wall thickness direction) is substantially the same as the wall thickness of the retaining wall, and the thickness of the joint material is substantially constant.
Furthermore, openings 14 are provided at predetermined intervals on the surface of the joint material 5 in the vertical direction (the height direction of the retaining wall). The concrete placed between a pair of wall molds sandwiching the joint material flows into the opening of the joint material and fills the other side wall molds sandwiching the joint material. In addition, the stability of the jointing material can be improved. The joint material may be in a form without an opening.

  Specifically, the separators 6A and 6B of the wall mold 4A are attached to the wall mold 4B so as to sandwich the joint material 5 from both sides. Next, the pair of pressing members 7 are erected on both sides of the joint material so as to contact the separator 6.

  In step S4, the one-side mold 4B where the retaining wall 2 remains is built, and the joint material 5 is disposed between the pair of wall molds 4A, 4B. In addition, a mold clamping metal fitting 11 is attached to the separator 6A protruding from the wall molds 4A, 4B, and the single tube 10 is clamped by the mold clamping metal fitting 11. Thus, the wall molds 4A and 4B covering both side surfaces of the retaining wall 2 are connected to each other by the separator 6, and the joint material 5 is disposed between the pair of wall molds 4A and 4B. .

In step S5, concrete is placed inside the pair of wall molds 4A, 4B.
In step S6, the separator 6 and the pressing member 7 supporting the joint material 5 are pulled out of the wall mold and the fixing means is removed from the placed concrete. Further, by removing the separator 6 and the pressing member 7, the temporary material is not left in the concrete frame.

  In step S7, the wall molds 4A and 4B covering both side surfaces of the retaining wall are disassembled. Then, the expansion joint 3 is formed by attaching a filler to the part from which the joint material 5 is removed, or leaving the joint material 5 as it is.

According to this embodiment, there are the following effects.
(1) After providing joint material in the wall thickness direction of the wall formwork that covers both side surfaces of the concrete wall-shaped member, the joint material is sandwiched from both sides by a connection member that connects the formwork together, and the connection member A pair of pushing members were arranged along with the above. Therefore, even if the joint material is pressed by the ready-mixed concrete when placing the concrete, the joint material is supported by the wall formwork by the connecting member and the holding member that penetrate the molds, so that the joint material is not misaligned. Can be prevented.
Further, the joint material is a connecting member for connecting a pair of wall molds and is sandwiched from both sides and is fixed to the wall mold, so that it can be arranged with high accuracy in the concrete frame.

  (2) The connecting member and the pressing member arranged to make the joint material self-supporting in the wall formwork of the concrete wall-like member can be removed from outside the formwork even after the concrete is placed. And concrete placement can be performed. After placing the concrete in the mold, the connecting member and the holding member are pulled out from the outside of the mold, so that a high-quality concrete structure can be constructed without the temporary material being placed inside the concrete. Further, the connecting member and the pressing member can be used repeatedly, and the temporary construction cost can be reduced.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like of the embodiment are included in the present invention as long as the object of the present invention can be achieved. In this embodiment, P-con is not attached to both ends of the separator 21, but P-con may be attached to both ends of the separator.

DESCRIPTION OF SYMBOLS 1 ... Construction method of joint material 2, 2A, 2B ... Retaining wall 3 ... Expansion joint 4, 4A, 4B ... Formwork (wall formwork)
5 ... Joint material 6 ... Connecting member (separator)
DESCRIPTION OF SYMBOLS 7 ... Holding member 10 ... Single pipe 11 ... Metal fitting for formwork clamping | tightening 12 ... Horizontal bar 13 ... Vertical bar 14 ... Opening part of joint material

Claims (2)

It is a construction method of joint material for constructing an expansion joint at a joint portion between a plurality of concrete wall-shaped members,
A pair of molds are built in both side surface positions of the concrete wall-shaped member, and joint materials are arranged in the wall thickness direction of the pair of molds,
A step of penetrating the molds in a state where the joint material is sandwiched from both sides with a connecting member that connects the pair of molds;
A step of erecting a pushing member abutted against the connecting member;
Placing concrete between the pair of molds;
Removing the pressing member and the connecting member;
And a step of disassembling the pair of molds. A joint material support structure for supporting joint material on the formwork of the joint portion between the concrete wall members,
A pair of molds arranged at both side surface positions of the concrete wall-shaped member;
A joint material disposed in the wall thickness direction between the pair of molds;
A pair of connecting members that penetrate the pair of molds and sandwich the joint plate from both sides;
A joint material support structure, comprising: a pair of pressing members that are erected in contact with the connecting member.

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