JPH02146399A - Air-tight method and air-tight construction of joint of tubular member - Google Patents

Abstract

PURPOSE:To increase performance of preventing local corrosion and leakage of a tubular member by providing and curing a reaction-cure liquid high- polymeric material between the joints, where the ends of tubular member main bodies are connected to each other, and covering tightly the joints with a heat- contractive high-polymer outer tube. CONSTITUTION:The joints 2a and 2b, where the ends of tubular members 1a and 1b are connected to each other, are covered with a heat-contractive high- polymer outer tube X. A reaction-cure liquid high-polymeric material W is provided between the outer surfaces of the joints 2a and 2b and the heat- contractive high-polymer outer tube X, and the heat-contractive high-polymer outer tube X is heated to contract. The reaction-cure liquid high-polymeric material W is penetrated into the minute gaps and their surroundings between the joints 2a and 2b and cured by the contraction force of the heat-contractive high-polymer outer tube X and by heating for contraction, and the outer surface of the joints are covered with the heat-contractive high-polymer outer tube X. Thus local corrosion and leakage of a tubular member can be prevented economically and efficiently.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an airtight method for a joint of a tubular member and an airtight structure for a joint of a tubular member, and more specifically relates to a method for fitting end parts of a tubular member main body together. The present invention relates to an airtight method for a joint of a tubular member and an airtight structure for a joint of a tubular member that improves the performance of preventing local corrosion and fluid leakage at the joint of a joint or fastening part.

[Conventional technology]

Conventionally, when constructing piping, rubber backing is used to maintain the airtightness of the fitting part 2 of the pipe.

Putty, tape, etc. are used.

However, due to changes in the environment, fluid leakage often occurs due to repeated loading and corrosion progression.

Therefore, recent technical measures have been taken to prevent the progression of corrosion.
As supplementary measures to prevent leakage from reducing the banking effect, Figure 5 (a), (b) and Figure 6 (a), (b)
As shown in FIG. 1, a heat-shrinkable polymer outer cylinder X whose inner surface is coated with an adhesive is used.

That is, the leakage prevention measure using the conventional heat-shrinkable polymer outer cylinder X shown in FIGS.

The heat-shrinkable polymer outer tube X is inserted into the flange portions 2a and 2b of 1b, and the heat-shrinkable polymer outer tube X is heated and contracted by a heating means from the outside. 1a, 1b, which is configured to fit tightly to the flange portions 2a, 2b of lb to prevent leakage, or the 6th
As shown in Figure +8) (b), threaded parts 3a and 3b are provided at both ends.
The pipes 4a and 4b equipped with By heating and shrinking the polymer outer cylinder X, the heat-shrinkable polymer outer cylinder X is brought into close contact with the outer peripheral surfaces of the piping 4a, 4b and the connecting member 5, as shown in FIG. This prevents leakage of flowing fluid.

[Problem that the invention seeks to solve]

However, in the case of the method of fitting the heat-shrinkable polymer outer cylinder X as described above to the fitting portion or fastening portion of the piping 1a, lb or 4a, 4b (7), the fitting screw portion, It has been difficult to compensate for leakage due to corrosion caused by minute gaps in fastening bolts and airtightness due to repeated loading.

[Purpose of the invention]

This invention was devised by focusing on such conventional problems, and it is possible to apply elasticity to joint members such as fitting parts and fastening parts of tubular members that cause fluid leakage, as well as minute gaps in corroded parts. A method for air-tightening a joint of a tubular member and a joint of a tubular member that significantly improves local corrosion and leak prevention performance of the tubular member by penetrating and filling a backing material such as a reactively hardening liquid polymer material having elongation. The purpose is to provide an airtight structure.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention inserts a heat-shrinkable polymer outer cylinder into the fitting part or the joint between the end parts of the tubular member main body, and connects the heat-shrinkable polymer outer cylinder to the outside. The heat-shrinkable polymer outer cylinder is coated in close contact with the outer circumferential surface of the joint by heating with heating means, and is interposed between the outer circumferential surface of the joint and the polymer outer cylinder when coating the heat-shrinkable polymer outer cylinder. The gist is that a reactively hardening liquid polymer material is infiltrated into the fine gaps of the joint part and the surrounding area under pressure, and is then hardened.

[Action of the invention]

As a method for airtightening a joint portion of a tubular member according to the present invention,
A heat-shrinkable polymer outer cylinder is inserted into the joint between the fitting or fastening parts of the tubular member main body, and the outer peripheral surface of the joint of the tubular member main body and the heat-shrinkable polymer outer cylinder are connected. With a reactively hardening liquid polymer material interposed in the gap, the heat-shrinkable polymer outer cylinder is heated from the outside at a constant temperature to heat-shrink the heat-shrinkable polymer outer cylinder. The heat-shrinkable polymer outer cylinder and the tubular member main body are bonded by utilizing the inward shrinkage force of the heat-shrinkable polymer outer cylinder during heat contraction and the viscosity reduction property of the reaction-curable liquid polymer material due to shrinkage heating. The reactive hardening liquid polymer material interposed in the gap between the seam and the fine gap at the seam,
The resin is infiltrated into the surrounding area under pressure to cause reaction and hardening, thereby making the joint of the tubular member airtight.

Moreover, it is possible to further improve the efficiency of construction by preheating the reaction-curing liquid polymer material within a range that does not interfere with the physical properties of the material or by preheating the workpiece.

[Embodiments of the invention] The present invention will be described in detail below based on the accompanying drawings.

In the following description, the same components as those of the above-mentioned conventional example will be described with the same reference numerals.

1 to 3 show a first embodiment of a method for airtightening the joints of tubular members such as piping according to the present invention. The joint parts 2a and 2b are made airtight.

That is, the flange joints 'la,' of the tubular members 1a, lb
A solid or flexible heat-shrinkable polymer outer cylinder X having a predetermined length and equipped with an injection hole 6 for the reaction-curable liquid polymer material W is inserted into the vicinity of lb, and as shown in FIG. Next, the vicinity of both ends of the heat-shrinkable polymer outer cylinder X is heated from the outside by a heating means 7 such as a dryer to shrink it.

The vicinity of both ends of the heat-shrinkable polymer outer cylinder X is the tubular member 1a.
, lb, a predetermined amount of reaction-curable liquid polymer material W is injected from the injection hole 6 as shown in FIG. 2, and the injection hole 6 is sealed with a plug (not shown). The heat-shrinkable polymer outer cylinder X is made of a heat-shrinkable polymer material.

In this state, when the heat-shrinkable polymer outer cylinder X at the flange joints 2a and 2b into which the reaction-curable liquid polymer material W is injected is heated by the heating means 7, the heat-shrinkable polymer outer cylinder X is heated. The heat-shrinkable polymer outer tube X and the tubular members 1a, 1.
The reaction-curable liquid polymer material W interposed in the gap between the flange joints 2a and 2b of flange joints 2a and 'lb
The flange joints 2a of the tubular members 1a and 1b are reacted and hardened by infiltrating the fine gaps and the surrounding area under pressure, and as shown in FIG.

2b is made airtight.

For the first heating of the heat-shrinkable polymer outer cylinder It is also possible to bring the shrinkable polymer outer cylinder X into close contact with the pipe 1a or 1b.

Further, in FIG. 4, tubular members 9a and 9b having threaded portions 8a and 8b at both ends are connected to each other via a connecting member 10, and a heat-shrinkable polymer is placed in the vicinity of this connecting member 10 in the same manner as described above. Insert the tube X and thread the threaded parts 8a of the tubular members 9a and 9b.
, 8b and the heat-shrinkable polymeric outer cylinder X in the same manner as above, the reaction-curable liquid polymeric material W is injected and sealed, and the heat-shrinkable polymeric outer cylinder X is heated by heating means 7 from the outside. By heating and shrinking the heat-shrinkable polymer outer cylinder X, the inward shrinkage force of the heat-shrinkable polymer outer cylinder X and the viscosity reduction property of the reaction-curable liquid polymer material W due to shrinkage heating are utilized. , the reaction-curing liquid polymer material W interposed in the gap between the heat-shrinkable polymer outer tube A fourth
As shown in the figure, the threaded portions 9a and 3b of the tubular members 9a and 9b
and the connecting member 10 are brought into an airtight state.

In addition, in the above embodiments, examples were explained for joining flange parts of tubular members and joining parts of threaded parts, but the present invention is not limited to the above embodiments, and may be implemented for other joining parts or fitting parts. Of course it is possible.

〔Effect of the invention〕

As described above, the present invention involves inserting a heat-shrinkable polymer outer cylinder into the joint between the fitting parts or fastening parts of the tubular member main body, and heat the outer circumferential surface of the joint of the tubular member main body to The heat-shrinkable polymer outer cylinder is heated from the outside with a reaction-curing liquid polymer material interposed in the gap between the heat-shrinkable polymer outer cylinder and the shrinkable polymer outer cylinder.
The heat-shrinkable polymer outer cylinder is heat-shrinked by heating at a certain temperature,
By utilizing the inward shrinkage force of the heat-shrinkable polymer outer cylinder during heat contraction and the viscosity-reducing property of the reaction-curing liquid polymer material due to shrinkage heating, the heat-shrinkable polymer outer cylinder and the tubular shape are A reaction-hardening liquid polymer material interposed in the gap between the joint part of the main body of the member is infiltrated under pressure into the minute gap of the joint part and its surroundings, and is reacted and cured to make the joint part of the tubular member airtight. This provides the following excellent effects.

<8), the fitting part of the tubular member that causes leakage of the tL body.

It is possible to significantly improve the local corrosion and leakage prevention performance of tubular members by infiltrating backing materials such as reactive hardening liquid polymer materials with elastic elongation into joint members such as fastening parts and minute gaps in corroded parts. I can do it.

(b) The amount of high-performance reaction-curing liquid polymer material, which is expensive, can be reduced to the minimum necessary amount, and economical efficiency with respect to quality can be ensured.

(C) Stable performance can be ensured against repeated deformation loads.

(d) The adhesion of the reaction-curing liquid polymer material to the workpiece is improved by pressurized infiltration filling, and the corrosion resistance is improved.

(f) Since the construction is easy, the work can be carried out efficiently.

[Brief explanation of the drawing]

Figures 1 to 3 show a first embodiment of the method for airtightening the joints of tubular members such as piping according to the present invention. Insert the tube,
A perspective view showing a state in which both ends are heated, and Fig. 2 is an explanatory diagram showing a state in which a reaction-curing liquid polymer material is injected between the flange joint of the tubular member and the heat-shrinkable polymer outer cylinder. , 3rd
The figure is a perspective view of the heat-shrinkable polymer outer cylinder in a state in which the entire body is heated by a heating means, and the heat-shrinkable polymer outer cylinder is contracted. a), (
b) and FIG. 6(b) are explanatory diagrams showing a conventional air-tight method for pipe joints. la, lb... tubular member, 'la, 2b... flange joint portion, 7... heating means, X... heat-shrinkable polymer outer cylinder, W... reactive hardening liquid polymer material.

Claims (1)

[Claims] 1. A heat-shrinkable polymer outer cylinder is inserted into the joint between the fitting or fastening parts of the tubular member main body, and the outer peripheral surface of the joint of the tubular member main body and the heat A heat-shrinkable polymer outer cylinder is formed by heating the heat-shrinkable polymer outer cylinder from the outside at a constant temperature with a reaction-hardening liquid polymer material interposed in the gap between the heat-shrinkable polymer outer cylinder and the heat-shrinkable polymer outer cylinder. The heat-shrinkable polymer outer cylinder is heat-shrinked, and the heat-shrinkable polymer is A reactively hardening liquid polymer material interposed in the gap between the joint of the molecular outer cylinder and the tubular member main body is infiltrated under pressure into the fine gaps of the joint and the surrounding area, and is reacted and hardened to form the joint of the tubular member. A method for airtightening a joint of a tubular member, the method comprising making the joint part of a tubular member airtight. 2. Inserting a heat-shrinkable polymer outer cylinder into the joint between the fitting or fastening parts of the end portions of the tubular member main body, and heating this heat-shrinkable polymer outer cylinder using external heating means. The outer circumferential surface of the joint portion is coated in close contact with the outer circumferential surface of the joint portion, and when the heat-shrinkable polymer outer cylinder is coated, a reactive hardening liquid polymer material is interposed between the outer circumferential surface of the joint portion and the polymer outer cylinder. An airtight structure for a joint portion of a tubular member, characterized by having a fine gap in the joint portion and infiltrating the periphery thereof under pressure and hardening the same.