JP3618392B2 - Chemical solution injection hose and concrete structure sealing method using the hose - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a chemical solution injection hose for sealing a connecting portion of a concrete structure and a concrete structure sealing method using the hose.
[0002]
[Prior art]
The ready-mixed concrete is driven in contact with the connecting portion of the concrete body, and when this is solidified, a gap is likely to occur in the joint portion of the connecting portion of the concrete structure where the cast concrete body is formed.
In order to inject a chemical solution in which a sealing agent, a foaming agent, a curing agent, etc. are mixed into the gap generated at the joint portion in the connecting portion of the concrete structure, for example, disclosed in JP-A-6-506275 Is known.
In this, a regularly perforated feed tube is covered with a compressible casing having through-holes.
[0003]
[Problems to be solved by the invention]
By the way, in the chemical injection hose having the structure as described above, clogging of the perforation of the feeding tube is prevented by the casing, but when the chemical injected into the feeding tube is discharged through the perforation, The casing may become an obstruction against the discharge of the chemical solution, and the penetration of the chemical solution into the connection portion of the concrete structure may be insufficient.
[0004]
In view of the above problems, an object of the present invention is to provide a chemical solution injection hose capable of smoothly infiltrating a chemical solution into a connecting portion of a concrete structure without shortage and a concrete structure sealing method using the hose. It is.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a chemical injection hose according to the invention of claim 1 is a chemical injection hose provided in a connection portion between a concrete body and a cast concrete body,
A core tube made of a material that generates heat by energizing a current, with a cylindrical structure that allows the chemical liquid to flow from the inside of the cylinder toward the outside of the cylinder, and the inside of the cylinder as a chemical solution injection path;
A jacket layer made of a low-melting-point material covering the outer periphery of the core cylinder so that the ready-mixed concrete does not enter from the outside of the concentric cylinder into the chemical injection path of the core cylinder.
Moreover, the sealing method of the concrete structure using the chemical injection hose according to the invention of claim 2 is a seal that seals the connecting portion between the concrete body and the cast concrete body using the chemical injection hose according to claim 1. Construction method,
Arranging the chemical injection hose at the connecting portion of the concrete body;
A step of forming a cast concrete body by pouring ready-mixed concrete in contact with the connecting portion of the concrete body and solidifying the chemical injection hose in an embedded state;
A process of removing current by flowing current through the core tube of the chemical solution injection hose and removing the cover layer by heating and melting the cover layer based on the generated heat;
And a step of injecting a chemical liquid for sealing into the chemical liquid injection path of the core cylinder.
[0006]
[Action]
In the present invention configured as described above, after the chemical injection hose is fixed to the connection portion on one side of the concrete body, the ready-mixed concrete is driven in contact with the connection portion of the concrete body, and the connection portion of the concrete body And a chemical injection hose are buried between the connection portions of the ready-mixed ready-mixed concrete. The cast concrete body is formed by solidifying the ready-mixed concrete.
Since the outer periphery of the core tube of the chemical solution injection hose is covered with an outer cover layer, there is no problem that fresh concrete enters the chemical solution injection path of the core tube.
After the ready-mixed concrete is solidified and cast concrete is formed thereby, the outer cover layer is heated and melted based on the energization heat generation of the core tube, and the outer cover layer is removed from the outer periphery of the core tube.
In this way, the chemical liquid is injected into the chemical liquid injection path of the core cylinder in a state where the outer cover layer is removed from the outer periphery of the core cylinder, so that the chemical liquid is well discharged to the outside of the core cylinder, and the concrete body and It penetrates into the gap in the jointed portion of the connecting portion with the cast concrete body without any shortage.
[0007]
【Example】
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, the chemical solution injection hose 1 includes a core tube 2 and an outer cover layer 3.
The core cylinder 2 has a chemical liquid injection path 4 in the cylinder, and a cylindrical structure that allows the chemical liquid to pass from the inside of the cylinder to the outside of the cylinder. For example, as shown in FIG. The net is rounded to form a cylinder. Moreover, the core cylinder 2 may be formed in a cylindrical shape by winding a wire rod in a spiral shape as shown in FIG.
Furthermore, the core cylinder 2 is formed of a material that generates heat when an electric current is applied, for example, a metal wire such as steel or stainless steel, or carbon fiber.
[0008]
The jacket layer 3 covers the outer periphery of the core tube 2 so that the ready-mixed concrete does not enter the chemical solution injection path 4 from the outside of the core tube 2, and is based on the energization heat generation of the core tube 2. It is formed of a thin sheet made of a low melting point resin, wax or the like that is melted.
[0009]
Next, the concrete construction sealing method will be described with reference to FIGS. 3 to 6 together with the action of the chemical injection hose of this embodiment configured as described above.
First, as shown in FIG. 3, the chemical injection hose 1 is fixed to a connecting portion on one side of the concrete body 11 by a fixing means, for example, an adhesive tape 12.
Further, as shown in FIG. 7A, when the concrete body 11 is molded in a factory, the chemical injection hose 1 is fixed to one side of the concrete body 11 by embedding about half of its cross section. May be.
Further, as shown in FIG. 7B, a recess having a semicircular cross section may be formed on one side surface of the concrete body 11, and the chemical solution injection hose 1 may be fitted and fixed in the recess 13.
[0010]
As described above, after the chemical injection hose 1 is fixed to the connection portion on one side surface of the concrete body 11, as shown in FIG. 4, the ready-mixed concrete is brought into contact with the connection portion of the concrete body 11 at the concrete placing site. 20 is driven, and the chemical injection hose 1 is buried between the connecting portion of the concrete body 11 and the connecting portion of the ready-mixed concrete 20 that has been driven. The cast concrete body 21 is formed by solidifying the ready-mixed concrete 20.
Since the outer periphery of the core tube 2 of the chemical solution injection hose 1 is covered with the outer cover layer 3 when the ready concrete 20 is solidified from being driven in, the ready concrete 20 enters the chemical solution injection path 4 of the core tube 2. Does not cause problems.
[0011]
After the ready-mixed concrete 20 is solidified and the cast concrete body 21 is thereby formed, a required current is passed through the core tube 2, thereby causing the core tube 2 to generate heat. Then, the jacket layer 3 is heated and melted based on the heat generation of the core tube 2, and the cover layer 3 is removed entirely or partially from the outer periphery of the core tube 2 as shown in FIG. 5.
[0012]
Here, a liquid chemical solution 31 in which a sealing agent, a foaming agent, a curing agent and the like are mixed is injected into the chemical solution inflow path 4 of the core tube 2.
Then, the said chemical | medical solution 31 is discharged toward the outer side from the inner side through the stitch of the core cylinder 2, and between wire. The discharged chemical solution 31 is infiltrated into the gap at the joint portion of the connecting portion between the concrete body 11 and the cast concrete body 21 and foamed and hardened, whereby the connecting portion is well sealed.
[0013]
【The invention's effect】
As described above, according to the present invention, the chemical solution can be smoothly permeated into the connecting portion of the concrete structure without being insufficient, and the connecting portion can be well sealed.
[Brief description of the drawings]
FIG. 1 is a cutaway perspective view showing a chemical solution injection hose according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an embodiment of the core cylinder.
FIG. 3 is a cross-sectional view showing a state in which a chemical solution injection hose is fixed to the connection part of the concrete body.
FIG. 4 is a cross-sectional view showing a state in which ready-mixed concrete is similarly placed on a concrete body in contact with a connection portion.
FIG. 5 is a cross-sectional view showing a state where the outer coating layer of the chemical solution injection hose is removed.
FIG. 6 is a cross-sectional view showing a state in which a chemical solution is injected into the chemical solution injection path of the core cylinder.
FIG. 7 is a cross-sectional view showing an embodiment of means for fixing a chemical solution injection hose to a connecting portion of a concrete body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Chemical liquid injection | pouring hose 2 Core cylinder 3 Outer layer 4 Chemical liquid injection path 11 Concrete body 21 Placing concrete body 31 Chemical liquid

Claims (2)

It is a chemical injection hose installed in the connection part between the concrete body and the cast concrete body,
A core tube made of a material that generates heat by energizing a current, with a cylindrical structure that allows the chemical liquid to flow from the inside of the cylinder toward the outside of the cylinder, and the inside of the cylinder as a chemical solution injection path;
A jacket layer made of a low-melting-point material covering the outer periphery of the core tube so that the ready-mixed concrete does not enter from the outside of the concentric tube into the chemical solution injection path of the core tube. Characteristic chemical injection hose. A sealing method for sealing a connecting portion between a concrete body and a cast concrete body using the chemical injection hose according to claim 1,
Arranging the chemical injection hose at the connecting portion of the concrete body;
A step of forming a cast concrete body by pouring ready-mixed concrete in contact with the connecting portion of the concrete body and solidifying the chemical injection hose in an embedded state;
A process of removing current by flowing current through the core tube of the chemical injection hose and removing the cover layer by heating and melting the cover layer based on the heat generation;
And a step of injecting a chemical solution for sealing into the chemical solution injection path of the core tube. A sealing method for a concrete structure using a chemical solution injection hose.

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