JPH0524817B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention mainly relates to an anti-corrosion method for waterproofing and preventing corrosion of a T-shaped pipe in an existing pipe.

<Conventional techniques and problems> Conventional methods for waterproofing and preventing corrosion of T-shaped pipes in various types of piping include a method of tightly wrapping anti-corrosion tape around the outer circumference of the T-shaped pipe, and a method shown in Figures 7 and 8. As shown, a heat-shrinkable synthetic resin sheet 2 is wound around the main pipe 1a of the T-tube 1, and a covering material 4 is provided with a cylindrical body 3 that fits onto the branch pipe 1b in the middle, and the sheet 2 is wrapped around the main pipe 1a. A method is adopted in which the covering material 4 is heated and shrunk with the cylindrical body 3 being externally fitted onto the branch pipe 1b, with both ends connected by a pair of chucks 5, 5.

However, the former tape winding method has problems in that it takes a long time to perform the construction work and has poor sealing properties.

In addition, the latter method using a heat-shrinkable synthetic resin sheet has a structure in which the sheet has a cylindrical body that fits onto the branch pipe, so there is a problem that it cannot be installed on the T-shaped pipe of the existing piping. be.

This invention was made in order to solve the above-mentioned problems, and provides a corrosion prevention method for T-shaped pipes that is easy to install, has excellent complete sealing properties, and can be installed on existing piping. The purpose is to

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention uses heat-shrinkable synthetic resin covering materials as a rectangular covering material and a trapezoidal covering material. The covering material includes
It has a structure in which a heat-melt adhesive layer is provided on one side and connection means are attached along both ends, and the rectangular covering material with the heat-melt adhesive layer on the inside is used as a branch pipe connection part of the main pipe. The trapezoidal covering material is applied to the outer periphery of the lower half of the main pipe, and the trapezoidal covering material is applied to the upper half of the main pipe at the part of the rectangular covering material that is applied to the lower half of the main pipe with the heat-melting adhesive layer inside. The adjacent ends of both coatings are connected by a connecting means and then heated and shrunk, and then the other side of the branch pipe joint is similarly shaped into a rectangular shape. A part of the trapezoidal covering material and the trapezoidal covering material are wrapped and applied to the covering material on the one side and heat-shrinked.

<Function> A plurality of heat-shrinkable synthetic resin sheets formed to cover the outside of the T-tube are applied to the outside surface of the T-tube, and adjacent sheets are interconnected or both ends of the sheets are connected. Then, by wrapping adjacent sheets, each sheet covers the outside of the T-tube.

Next, by heating each sheet, the sheet shrinks and comes into close contact with the outer periphery of the T-shaped tube, thereby providing waterproofing and corrosion protection by covering the outer circumferential surface of the T-shaped tube.

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6 of the accompanying drawings.

1 and 2 show an example of the shape and specific structure of the heat-shrinkable synthetic resin covering material 11 used in carrying out the present invention, and the rectangular covering material shown in FIG. 11a and a trapezoidal covering material 11b shown in FIG. 2 are used.

For the covering material, chucks 14, 14 are attached along both ends of a heat-shrinkable synthetic resin sheet 13 provided with a heat-melting adhesive layer 12 on one side, and the outer free end of one chuck 14 is located outside the chuck 14. A heat-shrinkable synthetic resin adhesive edge 15 that protrudes in a long direction is attached, and a heat-melting adhesive 16 is applied to one side of the adhesive edge 15.
It has a structure in which a hot-melt adhesive 17 is applied to the other side.

The above-mentioned covering material 11 was developed by the present applicants in 1983.
Although it was already proposed in Publication No. 44104, the structure of the covering material 11 is not limited to the above-mentioned structure. May be used.

In order to waterproof and prevent corrosion of the T-shaped tube 1 in the existing pipe, first, as shown in FIG. 11a, and then apply a trapezoidal sheathing material 11b from the upper half of the above to the left side of the branch pipe 1b, and connect the adjacent ends of both sheathing materials 11a and 11b with a chuck 14 to form a T-shape. tube 1
The left half of Figure 3 is covered.

In this state, using a gas burner etc., both coating materials 11
When a and 11b are heated, they are contracted and brought into close contact with the outer periphery of the T-tube 1. At this time, as shown in FIG. 6, the heat-shrinkable synthetic resin sheet 13 has a heat-melting adhesive layer 12 that adheres to the outer peripheral surface of the T-tube 1, and an adhesive 17 that adheres to the inner surface of the connecting portion of the chucks 14, 14. Since it is located on the side, the outer peripheral surface of the T-tube 1 can be hermetically coated.

Next, as shown in Fig. 4, install the rectangular sheathing material 11a and the trapezoidal sheathing material 11b on the right half of the T-tube 1 in the same manner as before, and wrap a portion of the sheathing material that was previously covered. In this state, the covering materials 11a and 11b are heated with a burner or the like to shrink them.

After this, a rectangular covering material 1 is placed on the outer circumference of the branch pipe 1b.
Both trapezoidal covering materials 1 with 1a attached first as shown in Fig. 5
1b, 11b, and the covering material 11a is also heat-shrinked with the chucks 14, 14 at both ends connected.

As mentioned above, the outer periphery of the T-tube 1 can be completely covered with a total of five heat-shrinkable synthetic resin sheets of two types, making it possible to waterproof the existing pipe.
Corrosion protection can be carried out easily.

<Effects> As described above, according to the present invention, a rectangular heat-shrinkable synthetic resin coating material with connecting means at both ends and a heat-melt adhesive layer on the inside and a trapezoidal heat-shrinkable synthetic resin coating material are provided. After covering the outer periphery of the T-shaped pipe with a material and connecting the adjacent ends of each heat-shrinkable synthetic resin sheathing material with a connecting means, each heat-shrinkable synthetic resin sheathing material is heat-shrinked. Since the shrinkable synthetic resin covering material is closely attached to the outer periphery of the T-shaped pipe, the outer periphery of the T-shaped pipe in the existing piping can be smoothly covered with a small number of heat-shrinkable synthetic resin covering materials with a simple shape. , the entire outer circumference of the T-tube can be waterproofed and anti-corrosion treated with simple work.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the covering material used in the construction method of the present invention, Fig. 2 is a plan view showing another shape similar to the above, and Fig. 3 is a perspective view of the covering material used in the construction method of this invention.
Each of the figures to FIG. 5 is an explanatory diagram showing the order of the corrosion prevention process, and FIG. 6 is a perspective view showing the connection part of the coating material.
FIG. 7 is a perspective view showing a conventional covering material, and FIG. 8 is a front view showing the same construction state. 1...T-shaped pipe, 1a...main pipe, 1b...branch pipe,
11... Covering material, 11a... Rectangular covering material, 11
b...Trapezoidal covering material, 12...Thermofusible adhesive layer,
13... Heat-shrinkable synthetic resin sheet, 14... Chuck, 15... Adhesive edge, 16... Hot-melt adhesive, 17... Hot-melt adhesive.

Claims (1)

[Scope of Claims] 1. A T-tube corrosion prevention method in which the outside of a T-tube is covered with a heat-shrinkable synthetic resin covering material provided with joining means at both ends, the heat-shrinkable synthetic resin covering material comprising: A rectangular covering material and a trapezoidal covering material are used. Each of these covering materials has a structure in which a heat-melting adhesive layer is provided on one side, and connecting means are attached along both ends. The rectangular covering material with the thermofusible adhesive layer on the inside is applied to the outer periphery of the branch pipe connecting portion of the main pipe and the lower half of one side thereof, and the trapezoidal covering material has the thermofusible adhesive layer on the inside, The rectangular covering material applied to the lower half of the main pipe was applied from the upper half of the main pipe to one side of the branch pipe, and the adjacent ends of both of the covering materials were connected by a connecting means. After that, the other side of the branch pipe connection part is heated and shrunk, and then a part of the rectangular covering material and the trapezoidal covering material are wrapped around the covering material on the one side and heated. A corrosion prevention method for T-shaped pipes characterized by shrinkage. 2. The heat-shrinkable synthetic resin covering material used for covering the T-tube is provided with a heat-melting adhesive layer on the top surface, connecting means are attached along both ends, and the connecting means is attached to one side of the connecting means. The free end is attached so that it protrudes outward for a long time, and the adhesive edge made of heat-shrinkable synthetic resin is coated with heat-melt adhesive on the bottom surface and heat-melt adhesive on the top surface, making it openable and closable. A method for preventing corrosion of a T-shaped pipe according to claim 1.