JPH0571220A - Water-proof disposing method for concrete jointing - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] It is an object of the present invention to provide a more reliable and inexpensive method for waterproofing the joints of old and new concrete in underground structures. [Structure] The linear device 1 is inserted between the joints of the old and new concrete, and after the new concrete 5 is cured, the linear device 1
Is removed to form a continuous cavity for grout material injection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing method for a concrete splicing part in an underground structure.

[0002]

2. Description of the Related Art Waterproofing of concrete joints is most important for preventing water leakage from underground structures. And as for the conventional concrete splicing part, (1) Insert a water stop plate made of vinyl chloride resin or chloroprene rubber, (2)
Stick non-vulcanized butyl rubber or water swelling rubber, (3) apply epoxy resin for splice part, (4) in case of reverse casting method, make voids in advance, inject mortar grout material later, (5) leak water For example, a hole is made in the place and a resin (hydrophilic urethane resin) that reacts with water and foams is injected into the back surface.

[0003]

By the way, the above-mentioned conventional methods are not perfect or expensive and cannot be adopted at any site.

The present invention was developed in view of the above circumstances, and more reliably and inexpensively, the waterproof treatment is performed by removing the compressed air in the air tube 7, and then the air tube 7 is pulled out from the synthetic resin net 6 to remove the air tube 7. In the mark that I pulled out,
A continuous cavity 10 is formed as shown in FIG.

A cement mortar-based or synthetic resin-based grout material is press-fitted into the continuous cavity 10 to achieve watertightness of the concrete splicing portion and waterproof treatment. FIG. 3 shows a second embodiment of the linear device 1. In this embodiment, the linear device 1 has a heating wire 9 arranged in the center thereof and a thermoplastic resin foam 8 wound around the heating wire 9, and the heating wire 9 is attached to the heating wire 9 after the new concrete 5 is hardened. A continuous cavity 10 shown in FIG. 4 is formed by flowing electricity to generate heat and melt the thermoplastic resin foam 8.

In the same manner as in the above-mentioned embodiment, a cement mortar-based or synthetic resin-based grout material is press-fitted into the continuous cavity 10 to achieve watertightness of the concrete splicing portion and waterproof treatment.

[0007]

As described above, the present invention is a method of forming a continuous cavity by inserting a linear device into a concrete joint and removing the linear device after hardening the new concrete. It is possible to reliably form a continuous cavity. If water leaks, it can be waterproofed by immediately injecting grout material through the continuous cavity. Even if there is no water leakage, grout can be injected for prevention.

Further, the linear device uses an air tube filled with compressed air, and after hardening the new concrete, the air is evacuated to form a continuous cavity, so that it can be easily and reliably constructed in a short time, and the construction cost is low. Is.

Further, as the linear device, one in which a thermoplastic resin foam is wound around a heating wire is used, and the thermoplastic resin foam is melted to form a cavity by applying electricity, so that it can be easily and surely conducted. Moreover, the construction can be done in a short time, and the construction cost is low.

[Brief description of drawings]

FIG. 1 is a perspective view of a state in which a linear device is inserted.

FIG. 2 is a perspective view of a first embodiment of the linear device used.

FIG. 3 is a perspective view of a second embodiment of the linear device used.

FIG. 4 is a perspective view showing a state where a continuous cavity is formed.

[Explanation of symbols]

1 ... Linear device, 2 ... Fastener, 3 ... Old concrete,
4 ... Reinforcing bar, 5 ... New concrete, 6 ... Synthetic resin net, 7 ... Air tube, 8 ... Thermoplastic resin foam, 9 ...
Heating wire, 10 ... Continuous cavity

Claims (3)

[Claims] 1. A linear device is inserted between the joints of old and new concrete, and after hardening the new concrete, the linear device is removed to form a continuous cavity for pouring grout material. Waterproofing method for concrete joints. 2. The linear device according to claim 1, wherein an air tube filled with compressed air is covered with a net,
A method for waterproofing concrete joints, which comprises drawing continuous cavities from an air tube net after hardening new concrete. 3. The linear device according to claim 1, wherein a heating wire is wired and a thermoplastic foam resin body is wound around the heating wire, and electricity is applied to the heating wire after hardening of new concrete. A method for waterproofing a concrete splicing part, characterized in that a continuous cavity is formed by heating and melting a thermoplastic resin foam.