JP2504348B2 - Waterproofing method for concrete splicing part - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for waterproofing a concrete joint portion of 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, and (3) splice for splicing. Epoxy resin is applied, (4) In the case of the reverse casting method, a void is provided in advance, mortar grout material is injected later, (5) A hole is made at the location where water leaks, and a resin that reacts with water and foams on the back (hydrophilic (Urethane resin) injection, etc.

[0003]

By the way, the above-mentioned conventional method is not perfect or expensive and cannot be used at any site.

The present invention was developed in view of the above circumstances, and an object of the present invention is to provide a method capable of performing waterproof treatment more easily, reliably and inexpensively.

[0005]

In order to achieve the above object, according to the present invention, between the joints of old and new concrete,
It is characterized by inserting a linear device in which an air tube filled with compressed air is covered with a net, and after hardening new concrete, pulling out the air tube from the net to form a continuous cavity for pouring grout material. In addition, between the joints of the old and new concrete, wire a linear device consisting of a heating wire wound with a thermoplastic foam resin around it, and after hardening the new concrete, apply electricity to the heating wire to generate heat, It is characterized in that a continuous cavity for injecting grout material is formed by melting a foam resin body.

[0006]

Embodiments will be described below based on the illustrated embodiments.

In FIG. 1, first, a linear device 1 for forming a continuous cavity is inserted between the joints of old and new concrete. In this case, the linear device 1 is installed along the upper end surface of the old concrete 3 and fixed by the fastener 2. The symbol 4 indicates a reinforcing bar, and the symbol 5 indicates new concrete (shown by a chain line).

As shown in FIG. 2, the linear device 1 comprises an air tube 7 filled with compressed air and covered with a net 6 made of synthetic resin.
The compressed air in the inside is removed, and then the air tube 7 is pulled out from the synthetic resin net 6, and the continuous cavity 10 is formed at the trace of pulling out the air tube 7 as shown in FIG.

Then, a cement mortar-based grout material is press-fitted into the continuous cavity 10 to make the concrete jointing portion watertight and waterproof.

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 cured after the new concrete 5 is hardened. Electricity is applied to the inside to generate heat, and the thermoplastic resin foam 8 is melted, whereby the continuous cavity 10 shown in FIG.
Is formed.

Then, as in the first embodiment, cement mortar-based grout material is press-fitted into the continuous cavity 10 to make the concrete joint water-tight and waterproof.

[0012]

As described above, the present invention is a method for forming a continuous cavity by inserting a linear device into a concrete splicing part and removing the linear device after hardening of new concrete. By using an air tube filled with compressed air covered with a net, it is possible to easily and quickly remove the air tube from the concrete splicing part with a simple operation of bleeding air after hardening the new concrete. It is possible to reliably form a continuous cavity for pouring grout material, and the construction cost is low.

[0013] As the linear device, by using a heating wire wound with a thermoplastic resin foam, the thermoplastic resin foam is melted by a simple operation of passing electricity after hardening of the new concrete. Thus, a continuous cavity for injecting grout material can be reliably formed, and the construction cost is low.

By forming a continuous cavity in the concrete splicing portion in this way, when water leaks, the grout material can be immediately injected through the continuous cavity to waterproof it. In addition, even if there is no water leakage, it is possible to inject grout material for prevention, which is a method that can greatly contribute to waterproofing.

[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 linear device in which an air tube is covered with a net.

FIG. 3 is a perspective view of a linear device in which a thermoplastic resin foam is wound around a heating wire.

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 (2)

(57) [Claims] 1. A linear device in which an air tube filled with compressed air is covered with a net is inserted between the joints of old and new concrete, and after the new concrete is cured, the air tube is pulled out from the net to inject grout material. A method for waterproofing concrete joints, characterized by forming continuous cavities. 2. A linear device composed of a heating wire wound with a thermoplastic foamed resin body around it is wired between the joints of old and new concrete, and after the new concrete is cured, electricity is applied to the heating wire to generate heat. A method for waterproofing a concrete splicing part, characterized in that a continuous cavity for pouring a grout material is formed by melting a thermoplastic foam resin body.