JPH0554812B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a tube lining method for conduits.

Conventional technology and its problems In the conventional tube lining method for pipelines, after the tube is bonded to the inner surface of the pipeline using an adhesive layer that has been applied and formed on the outer circumferential surface of the tube in advance,
Normally, the inside of the tube is kept under pressure until the adhesive layer is cured to cure the adhesive layer. Pipe lines to which tube lining is applied are usually rehabilitated pipe lines that have been rehabilitated by internal pipe cleaning, and have many irregularities and porous areas on the inner peripheral surface. If this is done, air will inevitably remain in the unevenness and porous areas. This residual air is compressed by the pressure applied from inside the tube during curing and curing of the adhesive layer, and this compression remains even after the pressure from inside the tube is released, creating a pressure difference between the outside and outside of the tube and causing the tube to peel off. .
Such a pressure difference becomes even more significant when heating and pressurizing the adhesive from inside the tube for the purpose of accelerating curing of the adhesive because the residual air expands in volume.

The present invention has been made with the aim of eliminating such conventional problems.

Means for Solving the Problems The present invention provides a method for bonding a lining tube to the inner surface of a conduit using an adhesive layer that has been previously applied to the outer peripheral surface of the tube, and then applying pressure or heat to the inside of the tube. In the tube lining method for conduits in which the adhesive layer is cured and cured under pressure, a string or belt-like breathable member is inserted between the conduit and the tube to cure the adhesive layer. The present invention relates to a tube lining construction method for a conduit, characterized in that during curing and curing, air is removed between the conduit and the tube through the air-permeable member.

Examples Examples of the construction method of the present invention will be described below based on the attached drawings.

When carrying out the construction method of the present invention, the lining tube 1 and the string-like or belt-like breathable member 2 are first inserted into the conduit a by pulling with a rope 3.

When the lining tube 1 is inserted into the conduit a, it is flattened as shown in the cross-sectional view of FIG. 2 to facilitate insertion, and the outer peripheral surface is bonded to the conduit a. For this purpose, a two-component reaction-curing adhesive layer 4 consisting of a main agent and a curing agent is formed by coating in advance. Further, the air permeable member 2 is attached to the center of the lower surface of the tube 1.
This breathable member 2 is located between the conduit a and the tube 1.

After inserting the tube 1 and the breathable member 2 over the entire length of the conduit a as shown in FIG.
Both ends 2a, 2a of the breathable member 2 are drawn out from both ends of the conduit a and placed in the atmosphere, and lids 5, 6 are provided at both ends of the lining tube 1. One lid 5 is provided with an air supply hole 5a, which is connected to a compressor 7 and a boiler car 8 via conduits 7a and 8a. The other lid 6 is provided with an exhaust hole 6a, and an exhaust pipe _6a1 connected to the exhaust hole 6a is provided with an on-off valve _6a2 for adjusting the pressure within the tube 1.

When the compressor 7 is operated to supply pressurized air into the tube 1 in the state shown in FIG. 3, the tube 1 is expanded from its flat state and restored to its original circular cross-sectional state, and is crimped onto the inner surface of the conduit a. . In this state, since the adhesive layer 4 is of a two-component reaction curing type, it has not yet been cured. Next, the boiler car 8 is operated to continue supplying the above-mentioned pressurized air into the tube 1, or to supply steam instead of pressurized air, and to maintain the inside of the tube 1 in a heated and pressurized state for a predetermined period of time. , the adhesive layer 4 is aged and cured to promote curing.

The above _- mentioned pipe a is a rehabilitated pipe, and as shown in the enlarged cross-sectional view of _FIG . The air remaining in this area is removed from the tube 1 mentioned above.
When heated and pressurized from the inside, it is heated, expands and compresses in volume, and increases the pressure. In general, the above-mentioned irregularities
_a1 and porous portion _a2 are discontinuous in the axial direction of conduit a, but are substantially continuous in the circumferential direction, and
Since the remaining air is connected to the air-permeable member 2 inserted between the tube 1 and the air-permeable member 2, as the residual air is heated and pressurized and the pressure increases, it is discharged to the outside of the pipe line a through the air-permeable member 2.

Even after the curing of the adhesive layer 4 is completed and the inside of the tube 1 is released from the heated and pressurized state, the tube 1 remains
There is no pressure difference between the inside and outside, and the problem of the tube 1 coming off can be solved.

FIG. 5 shows the state of the adhesive layer 4 during curing and hardening, and a good tube lining without partial peeling is obtained.

In the present invention, the lining of the tube 1 on the inner surface of the conduit a may be performed using a known inverted lining method, as shown in FIGS.
As shown in the figure, by placing the breathable member 2 in the uninverted tube 1' in advance, the breathable member 2 can be inserted into the conduit a using the lining of the tube 1. In FIG. 7, 6a' is an exhaust pipe for adjusting internal pressure inserted into the tube 1 after inverted lining.

In the construction method of the present invention, after inserting the breathable member 2 into the pipe line a as shown in FIG. 9, a known lining method is applied to line the pipe line a with a tube. You can also do this.

In the construction method of the present invention, as the breathable member 2, a string-like or belt-like member made of natural or synthetic fibers can be used, for example, and the adhesive surface with the adhesive layer 4 is permeated with the adhesive. It may be covered with an appropriate film so that its properties are not impaired. Furthermore, since the breathable member 2 will be left as it is between the conduit a and the tube 1 even after construction, it should have a width that does not substantially have a negative effect on the adhesion state of the lining of the tube 1.
Approximately 1/50 to 1/20 of the circumference length (inner diameter) of tube 1 is appropriate, and the thickness should be as thin as possible within the range that maintains breathability. It is selected as appropriate depending on the diameter of the lens.

In the construction method of the present invention, in order to more effectively exhaust residual air using the breathable member 2, the air may be actively sucked and discharged through the breathable member 2 using a vacuum pump or the like. .

Effects According to the construction method of the present invention, the residual air that is compressed and the pressure increases in the uneven parts and outer holes of the inner surface of the pipe during heating and curing of the adhesive layer is removed by the ventilation inserted between the pipe and the lining tube. It has the feature of being able to escape into the atmosphere through the elastic member, and eliminating the negative effects of residual air on the tube lining.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view showing the process of inserting the lining tube and the breathable member into the pipe line in one embodiment of the construction method of the present invention, and Figure 2 is taken along line A to A in Figure 1. Figure 3 is a longitudinal cross-sectional view showing the heating and curing process of the adhesive layer, Figure 4 is an enlarged cross-sectional view taken along line B-B in Figure 3, and Figure 5 is the completed lining. Fig. 6 is a vertical sectional view showing the process of inserting the lining tube and the breathable member into the pipe in another embodiment of the construction method of the present invention; Fig. 7 is the same A vertical cross-sectional view showing the state of the adhesive layer during heat curing, FIG. 8 is a cross-sectional view taken along line C to C in FIG. 7,
FIG. 9 is a longitudinal cross-sectional view showing how the breathable member is inserted into the pipe in still another embodiment of the construction method of the present invention. In the figure, 1 is a tube for lining, 2 is a breathable member, 3 is a rope, 4 is an adhesive layer, and 5 and 6 are lids.

Claims (1)

[Claims] 1. After adhering a lining tube to the inner surface of the conduit using an adhesive layer that has been applied and formed on the outer circumferential surface of the tube in advance, the inside of the tube is kept under pressure or heated and pressurized to form the adhesive layer. In the tube lining method for pipes that measures curing and curing, a string or belt-like breathable member is inserted between the pipe and the tube, and when the adhesive layer is cured, the pipe is lined through the air permeable member. A tube lining construction method for conduits characterized by performing deaeration between the tube and the tube.