JP2000291851A - Water cut-off method for pipe joint using gellike water cut-off material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a water cut-of property of a pipe joint without degrading the executability. SOLUTION: A string-shaped gellike cut-off material 3 in which the characteristic of the breaking elongation is maximum 1300% and it is not changed in the service temperature range between -40 deg.C and 80 deg.C is wound around an end portion of a tube while applying the constant tension, the end portion around which the cut-off material 3 of this tube 1 is wound is inserted in a joint member 2, the gellike cut-off material 3 is returned to a condition before applying the tension inside the joint member 2, and thus, the gellike cut-off material 3 is filled between the joint member 2 and the tube 1 to cut-off water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for stopping water at joints of various pipes, and more particularly to a method of stopping water at pipe joints using a gel-like waterproof material.

[0002]

2. Description of the Related Art In general, as a method for stopping water at a pipe joint, there is a method of filling a ring-shaped packing material inside the joint to stop water. In this method, after the joint is constructed, the packing material is filled between the inner surface of the joint and the outer surface of the pipe in a crushed manner, so that a surface pressure is generated on the packing material and water can be stopped.

[0003]

However, the above-mentioned conventional method for stopping water at a pipe joint has the following problems.

(1) When the packing material is not completely filled between the joint and the pipe, the surface pressure generated in the packing material is insufficient, and it is impossible to completely stop water.

(2) If the difference between the inner diameter of the joint and the outer diameter of the pipe is small, the resistance of the packing material when inserting the pipe into the joint increases, and the workability deteriorates.

(3) In the case of a method in which a packing material is directly attached to a pipe, it becomes difficult to fit the packing itself as the pipe outer diameter increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and uses a gel-like water-blocking material that improves the water-blocking performance of a pipe joint and does not reduce the workability. It is an object of the present invention to provide a method for stopping water from a pipe joint part.

[0008]

According to the present invention, there is provided a method for waterproofing a pipe joint using a gel-like waterproofing material according to the present invention, which has a maximum elongation at break of 1300% and a working temperature range of -40 to 80 ° C. In the above, a gel-like water-blocking material formed in a string shape in which the characteristic of the breaking elongation does not change is wound around a pipe end portion while applying a constant tension, and the portion of the pipe where the water-blocking material is wound is inserted into a joint member, and the joint By returning the gel-like water blocking material to a state before applying tension inside the member, the gel-like water blocking material is filled between the joint member and the pipe to stop water.

When the portion of the pipe around which the water-stopping material is wound is inserted into the joint member, the water-stopping material is not bulky because the gel-like water-stopping material is wound around the tube while applying tension thereto. It can be easily inserted into the joint member.

After inserting the pipe into the joint member,
Due to its elongation at break, the gel-like waterproofing material returns to the thickness before tension was applied and fills between the pipe and the joint.
Therefore, the water stoppage of the pipe joint is complete.

[0011]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a state before a pipe is inserted into a joint member in a water stopping method for a pipe joint using a gel-like water stopping material according to an embodiment of the present invention, and FIG. FIG. 6 is a cross-sectional view showing a state after insertion into the device.

In the method for stopping water from a pipe joint using a gel-like water stopping material according to an embodiment of the present invention, as shown in FIG.
Before inserting the pipe 1 into the joint member 2, several turns (four in FIG. 1) of the string-like gel-like waterproof material 3 are wound around the pipe 1 at the position corresponding to the insertion of the joint member 2 while applying a constant tension. . When the gel-like water blocking material 3 is wound around the tube 1, an adhesive is used so that the gel-like water blocking material 3 does not come off from the tube 1. It must not be so strong that it is fixed to the tube 1. In other words, it is sufficient that the gel-like water-stopping material 3 is strong enough to return to the original state within a certain time after winding.

Since the gel-like waterproof material 3 is wound while applying tension, there is no large difference between the outer diameter of the tube 1 and the outer diameter of the portion where the gel-like waterproof material 3 is wound. Member 2
Can be easily inserted into the opening 2a.

An opening 2a of the joint member 2 has a
However, a water-stopping material retainer 5 is provided inside the joint member 2, and the gel-like water-stopping material 3 wound around the pipe 1 is connected to the water-stopping material retainer 4 and the water-stopping material retainer 5. It is inserted so that it may be located. This is because when the gel-like water-stopping material 3 returns to the state before the tension is applied, the gel-like water-stopping material 3 is surely shifted to the water-stopping material presser 4 side, so that the water stopping effect is improved. It is.

As shown in FIG. 2, the gel-like water-stopping material 3 inserted into the joint member 2 returns to a state before tension is applied after a predetermined time, and its length is increased from four when wound. 2
Turn into a volume. Accordingly, the cross-sectional area of the gel-like water-stopping material 3 also increases, and the gel-like water-stopping material 3 fills between the pipe 1 and the joint member 2 so that a sufficient water-stopping effect can be achieved. .

After the pipe 1 is inserted into the joint member 2, the retaining member 6 of the split ring cuts into the outer peripheral surface of the pipe 1. The tube 1 does not deviate from the coupling member.

[0017]

EXAMPLES In order to confirm the effects of the present invention, the method of the present invention, a method using a cord-like vulcanized rubber instead of a gel-like water blocking material, and a method using a conventional ring-shaped vulcanized rubber packing are described. The workability and water stoppage of each were investigated.
The experimental method is as follows. After connecting the pipe, the side of the pipe without the joint is closed, the pipe is filled with water, and the pressure in the pipe is set to 10 kg / c.
As m ^2, the initial (construction 30 minutes after) and 30 days later,
Evaluation of pressure drop and leak in the pipe was performed 30 pieces for each condition. Table 1 shows the results.

[0018]

[Table 1]

As is evident from Table 1, the method of the present invention is more excellent in both workability and waterproofness than the other methods.

[0020]

According to the present invention, the water stopping performance can be increased without lowering the workability.

[Brief description of the drawings]

FIG. 1 is a front view showing a state before a pipe is inserted into a joint member in a water stopping method for a pipe joint using a gel-like water stopping material according to an embodiment of the present invention.

FIG. 2 is a front view showing a state after a pipe is inserted into a joint member in the method of stopping water from a pipe joint using a gel-like water stopping material according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipe 2 Joint member 3 Gel-like water stopping material 4 Water stopping material retainer 5 Water stopping material retainer 6 Retaining member

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideya Nagasaka 1-2-1 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 3H014 AA15

Claims (1)

[Claims] (1) having an elongation at break of up to 1300%;
In the operating temperature range of −40 to 80 ° C., the string-like gel-like water-stopping material whose elongation at break does not change is wound around the pipe end while giving a constant tension, The wound portion is inserted into the joint member, and the gel-like water-stop material is returned to a state before tension is applied inside the joint member, so that the gel-like water-stop material is filled between the joint member and the pipe and stopped. A method for stopping water at a pipe joint using a gel-like water stopping material, characterized by watering.