JP3216505B2 - Pipe line lining method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for attaching a lining material to a pipe buried underground, and particularly to a method for lining a pipe such as a sewer pipe. It is about.

[0002]

2. Description of the Related Art In general, when lining a pipeline buried underground, a lining material is inserted into the pipeline, and a heated pressurized fluid such as pressurized steam is fed into the lining material. The lining material is inflated and pressed against the inner surface of the pipeline, and the lining material is heated by the heating and pressurizing fluid to cure the resin liquid impregnated in the lining material, thereby forming a rigid pipe in the pipeline to form the lining. That is being done.

[0003]

However, among these pipelines, sewer pipes and the like are formed by connecting relatively short fume pipes and the like, and since the contents flow according to the inclination of the pipeline, the pipes are not provided. The pressure resistance of the road is not very high, and the connection is often not kept highly airtight.

[0004] Therefore, in such sewer pipes and the like,
Due to the movement of the ground caused by the vibration of vehicles running on the road surface, joints such as fume pipes may be displaced, causing irregularities in the vertical direction, and recesses lower than both sides in the middle of the pipeline It is not often formed.

When lining a pipe having such a recess, the pressurized steam fed into the lining material condenses and the drain and water used in the lining work stay in the recess, and the recess is formed. In the lower part of the place, the lining material is not sufficiently heated, and insufficient curing of the resin liquid occurs.

That is, when the drain stays in the recess, the heat is taken from the lower part in contact with the lining material and cooled. The liquid level of the drain is heated by contact with the pressurized steam, but heat is taken from the lower part, so that convection does not occur, and the heat of the pressurized steam is blocked by the drain and is not transmitted to the lining material.

Japanese Patent Application Laid-Open No. 4-271885 describes a method in which a tube is inserted into a lining material, and the drain of a recess is discharged from the tube while moving the tip of the tube through the lining material. I have.

However, in this method, since the location of the recess cannot be known from the outside, it is extremely difficult to position the tip of the tube in the recess where the drain easily stays, and the tip of the tube is moved slowly. However, when the tip of the tube happens to pass through a place where the drain is located, it is inevitable to wait for the tube to be discharged by accident.

The present invention has been made in view of such circumstances, and when lining a pipe having a recess as described above, the drain that has accumulated in the recess is efficiently discharged, and the lining material is pressurized steam or the like. It is an object of the present invention to provide a method capable of reliably curing a resin liquid by heating with a heated and pressurized gas.

[0010]

According to the present invention, a lining material is inserted into a pipeline, a pressurized fluid is fed into the lining material, and the lining material is pressed against the inner surface of the pipeline, whereby the lining material is formed. A heated and pressurized gas containing pressurized steam is supplied from one end, and the cross-sectional area of the lining material is 10 to 8 over the entire length of the lining material.
A flexible water-push member having a cross-sectional area of about 0% and having a weight that does not float on the drain staying in the lining material is reciprocated, and the liquid collected at the end of the lining material is removed. The discharge is performed at the terminal.

FIG. 1 shows a lining according to the invention. Reference numeral 1 denotes a pipe formed by connecting a plurality of fume pipes, and a recess 3 is formed in the pipe. Then, the lining material 4 is inserted through the pipe 1, expanded by the internal pressure and pressed against the inner surface of the pipe 1.

Both ends of the lining material 4 are closed by closing members 5, and an air supply pipe 6, an exhaust pipe 7, and a drain pipe 8 are attached to the closing member 5. A heated and pressurized gas is inserted into the lining material 4 from the air supply pipe 6, and the heated and pressurized gas is discharged from the exhaust pipe 7. A drain pipe 8 is provided at both ends of the lining material 4. Drain is discharged.

Numeral 9 designates a water push member inserted into the lining member 4, and a cord 10 attached to the water pushing member 9 is drawn out from both ends of the lining member 4 to the outside. The water pushing member 9 is reciprocated in the lining material 4 by pulling the tow.

As the pipeline 1 to which the present invention is applied, it is appropriate to apply to a sewer pipe formed by connecting a short fume pipe as described above. In such a sewer pipe, since the connecting portion of the fume pipe is not strong, the recess 3 is easily formed, and the effect of applying the present invention appears more clearly.

However, the present invention is not limited to sewer pipes but is widely applied to pipes buried underground, such as gas pipes, water pipes, and laying pipes for power lines and communication lines. can do.

Although the present invention is particularly effective when there is a recess 3 in the pipeline 1, the presence of such a recess 3 is not essential, and the present invention is applied if there is a possibility that the recess 3 exists. Is preferred. The present invention is also effective in the case where the pipe 1 has almost no recess 3 or the horizontal pipe 1 does not allow the drain to flow easily.

As the lining material 4 in the present invention, a material obtained by applying a reaction-curable resin liquid to the outer surface of an airtight and flexible tubular body is used. The structure of the tubular body is not particularly limited, but it is suitable that an air-tight tube is attached to the inner surface of a woven fabric, a nonwoven fabric, or a laminate of these, and the fiber layer is impregnated with a resin liquid.

The liner 4 may be made of a sheet molding compound in which fibers are dispersed in a thickened thermosetting resin. In short, as the lining material 4 of the present invention, any material that forms a lining by curing a thermosetting resin can be used.

The lining material 4 is inserted into the pipeline 1.
As a method of insertion, the lining material 4 may be pulled into the pipeline 1, or the lining material 4 having an inverted inner and outer surface may be inserted into the pipeline 1 while being turned upside down by fluid pressure.
Then, a pressurized fluid is inserted into the lining material 4 inserted into the pipeline 1, and the lining material 4 is expanded and pressed against the inner surface of the pipeline 1.

Next, a heated and pressurized gas is fed into the lining material 4, and the lining material 4 is heated to cure the reaction-curable resin liquid, thereby forming a rigid FRP tube inside the pipe 1. Lining.

As the heated and pressurized gas in the present invention, pressurized steam can be generally used, but depending on the heating and pressurizing conditions, a mixture of pressurized steam and compressed air can also be used.

The pressure and temperature of the heated and pressurized gas are appropriately set according to the withstand pressure and the degree of damage of the pipe 1 to be applied, the type of lining material used, the curing conditions of the curable resin liquid, and the like. pressure at about 0.3~2kg / cm ^2, temperature of 100
It is appropriate to set it to about 130 ° C.

According to the present invention, when the heating and pressurizing gas is fed into the lining member 4 and heated, the water pushing member 9 is inserted into the lining member 4 and the water pushing member 9 is lined. It reciprocates in the material 4.

The water pushing member 9 in the present invention is sufficiently flexible, and has such a flexibility that it can be deformed along the lining material by its own weight in the lining material and can be brought into close contact with the lower inner surface of the lining material. It is necessary to do.

On the other hand, since the water pushing member 9 rubs against the inner surface of the lining material 4 by being reciprocated in the lining material 4, the water pushing member 9 must have abrasion resistance to such an extent that it is not destroyed by the friction. is necessary.

Further, since the water pushing member 9 is excessively light, and it is inconvenient to float on the drain in the lining material 4, it is necessary that the water pushing member 9 be heavy enough to prevent such a problem. However, since it is sufficient if the drain can be moved within the lining material 4, the specific gravity does not necessarily need to be 1 or more, and it is sufficient that the apparent specific gravity is approximately 0.8 or more.

When the water-pressing member 9 is inserted into the lining material, the cross-sectional area of the water-pressing member 9 is suitably about 10 to 80% of the cross-sectional area in the lining material. If the cross-sectional area of the water pushing member 9 is less than 10%, the function of moving the drain in the lining material is poor, and if the cross-sectional area of the water pushing member 9 exceeds 80%, the flow of the heated and pressurized gas in the lining material is reduced. Inhibited and insufficient heating.

The structure of the water pushing member 9 is as follows. A thin woven bag is filled with a liquid such as water or saline solution, a granular material such as sand, or a viscous material such as grease or a resin solution. What is done is appropriate.

Particularly, it is preferable to use a water-permeable bag in which a water-absorbing resin is sealed. The water-absorbing resin absorbs the drain and swells, increasing the volume and weight, and can be used as the flexible water-push member 9. Also, when the water-absorbent resin swells, swelling occurs, and the swelling covers the surface of the bag body and reduces the frictional resistance with the inner surface of the lining material 4. The load is small.

When a water-absorbent resin is used, the cross-sectional area of the water-pressing member 9 in the lining material is as follows:
When the water-absorbent resin has sufficiently absorbed water, the water push member 9 should be 10 to 80% of the lining material.

Although a sufficiently flexible block of synthetic resin or rubber can be used as the water-pressing member 9, it has such flexibility that it can be deformed by its own weight to such an extent that it can follow the inner surface of the lining material 4. Often, the material does not have enough strength to pull the inside of the lining material 4 or abrasion resistance enough to withstand friction with the inner surface of the lining material 4, ensuring strength and abrasion resistance. For this purpose, it is preferable to wrap the surface of the block with a thin woven bag or the like.

The water pushing member 9 is reciprocated in the lining material 4 by being pulled from both sides of the pipe line 1 by the cord body 10. It is preferable that the frequency of movement of the water pushing member 9 is such that the drain does not stay in the recess 3 of the pipeline 1 for a long time. Although it depends on the size of the recess 3 and the amount of drain generated, if the frequency is about one reciprocation approximately every 5 to 6 minutes, the temperature does not drop because the drain etc. stays in the recess 3 for a long time, The lining material 4 can be sufficiently heated and cured.

It is preferable that the water pushing member 9 be reciprocated continuously while the lining material 4 is being heated.
It can also be performed intermittently, such as once or twice an hour, so as to make two or three reciprocations. If it takes a long time to cure the lining material 4, the water pushing member 9 is reciprocated for about 30 minutes to 1 hour in the initial stage, and the temperature of the lining material 4 rises sufficiently to accumulate heat. Then, the water push member 9 may not always have to be reciprocated thereafter.

[0034]

In the present invention, the lining material 4 is expanded by the heated and pressurized gas sent into the lining material 4 and
While being pressed against the inner surface, it is heated by the heat of the heated and pressurized gas, the reaction-curable resin liquid contained in the lining material 4 causes a curing reaction, and the lining material 4 is cured.

The heated and pressurized gas is condensed by removing heat from the lining material 4 to generate a drain 11. If there is a recess 3 in the pipe 1 at this time, the drain 11 stays in the recess 3.

Here, in the present invention, since the flexible water pushing member 9 is reciprocated in the lining material 4, when the water pushing member 9 passes through the recess 3, the shape of the bottom of the recess 3 is changed. The drain 11 that was staying in the recess 3 while along
1 and is moved while pushing the drain 11 on the front surface of the water pushing member 9 as shown in FIG.

When the water pushing member 9 reaches the terminal portion of the lining material 4 while collecting and pushing the drain 11, the drain 11 pushed by the water pushing member 9 is discharged from the drain pipe 8 to the outside of the lining material 4. Is discharged.

As described above, in the present invention, when the water pushing member 9 reciprocates in the lining material 4, the water pushing member 9 collects the drains 11 retained therein through all the recesses 3. The drain 11 in the lining material 4 is removed by collecting the drain 11 from the drain pipe 8 at the end of the lining material 4 while pressing it on the front surface.

[0039]

According to the present invention, therefore, the recess 3 of the pipeline 1
, The drain 11 is removed from the recess 3 by the water pushing member 9 and the drain 11 is removed.
The heat is shut off by the drain 11 and the lining material 4 is not sufficiently heated, so that the resin liquid does not become insufficiently hardened. it can.

In addition, even when the present invention is applied to a long pipe 1 or when there are a plurality of recesses 3 in the pipe 1,
The present invention can be applied without considering the length of the conduit 1 and the number of the recesses 3 and the position of the recesses 3 does not need to be considered, so that the lining work can be performed extremely easily.

[0041]

EXAMPLE Nine fume pipes 2 each having a length of 2 m and a diameter of 300 mm were connected to form a pipe 1 shown in FIG. The upper diagram in FIG. 1 shows the inclination angle of each fume tube 2, and the inclination is considerably exaggerated in the drawing.

In the pipe 1, the right end in the figure is high and the left end is inclined low, and a height difference of 220 mm is formed between both ends. Most of the fume tubes 2 are inclined leftward and downward in the forward direction, while the third and fifth fume tubes 2 from the right are inclined upward in the leftward and opposite directions, each having a depth of 14.
mm and 28 mm recesses 3 are formed.

Reference numeral 4 denotes a lining material, which is inserted over the entire length of the pipe 1 and is inflated by a pressurized fluid and pressed against the inner surface of the pipe 1. As the lining material 4, a non-woven fabric impregnated with an unsaturated polyester resin was used. Curing characteristics of this unsaturated polyester resin were those of 50 ° C. × 8 hours, 60 ° C. × 2 hours or 70 ° C. × 1 hour.

At the upper end of the lining material 4, an air supply pipe 6 for feeding heated and pressurized gas and a drain pipe 8 are attached, and at the lower end of the lining material 4, an exhaust gas is provided. Tube 7
And a drain pipe 8 are attached.

A water pushing member 9 is inserted into the lining material 4 so that the cord body 10 can reciprocate in the lining material 4. As the water pushing member 9, a water-absorbing resin sheet (300 mm width × 430 mm when absorbing water) is used.
Length × 20 mm thick) wrapped in a 280 mm diameter woven bag.

[Experiment] Pressurized steam (pressure 1)
kgf / cm ² , 120 ° C.). During the first 35 minutes of the experiment, the water pushing member 9 was not moved while being kept at the upper end of the lining material 4. (Step A) Next, after a lapse of 35 minutes, the water pushing member 9 was reciprocated for 25 minutes at a speed of about 3 minutes per reciprocation over the entire length of the lining material 4. (Step B) After that, the water pushing member 9 is again positioned at the upper end of the lining material 4 and the insertion of the heated and pressurized gas is continued without being moved. Heated.
(Step C) The upper end and the lower end of the lining material 4 and the two recesses 3a and 3
In (b), a temperature sensor was attached to the lower part of the lining material 4, and the temperature change at each point in the heating step was measured. The results are shown in the graph of FIG.

[Experimental Results] As a result of the experiment, as shown in FIG. 3, at the upper end and the lower end of the lining material 4, the temperature quickly exceeded 80 ° C., and the lining material 4 hardened in a short time. It can be seen that the obtained temperature condition is satisfied.

Since the upper end is close to the air supply pipe 6 and the lower end is the farthest position from the air supply pipe 6, the rate of temperature rise is different, but all are at a temperature sufficient for curing. In addition, since neither the upper end nor the lower end is affected by the drain, at a position other than the recess 3 in the entire lining material 4, a curve generally drawn between the temperature rising curve of the upper end and the lower end is drawn. It is considered that insufficient curing does not occur.

In the recesses 3a and 3b, the process A
At about 15 minutes after the start of heating, the temperature rise curve became nearly horizontal, and even after 35 minutes, the temperature rise curve was 40 to 4 hours.
The temperature is about 5 ° C.
It is considered difficult to reach ° C. This is because the heat of the heated and pressurized gas is shut off by the drain 11 retained in the recess 3, and the heat is not sufficiently transmitted to the lining material 4.

Here, when the process proceeds to the step B and the reciprocating movement of the water pushing member 9 is started, the temperature of the recesses 3a and 3b rapidly rises and exceeds 80 ° C. The drain 11 in the recess 3 is removed by the movement of the water pushing member 9, and the heated and pressurized gas directly touches the lining material 4 of the recess 3.

After the temperatures of the recesses 3a and 3b have risen sufficiently, the process proceeds to step C, and when the reciprocation of the water pushing member 9 is stopped, the temperature of the lining material 4 in the recesses 3a and 3b decreases. The rate of the temperature drop was low, and a temperature of about 70 ° C. was secured even after 2 hours had passed since the start of heating.

When the reciprocating movement of the water pushing member 9 is stopped, the drain 11 stays in the recess 3 and the heat of the heated and pressurized gas is cut off by the drain 11, so that the heat is not transmitted to the lining material 4. , Temperature decreased.

However, in the previous step B, the lining material 4 is sufficiently heated, and sufficient heat is accumulated in the lining material 4 and the fume tube 2 outside the lining material 4. Even if the heat of the pressurized gas is cut off, the temperature of the lining material 4 is maintained by the accumulated heat, so that the temperature does not excessively decrease, and a sufficient temperature is maintained.

At the upper end and the lower end of the lining material 4, a smooth temperature rising curve is drawn regardless of the reciprocating movement of the water pushing member 9. It does not affect the temperature of the lining material 4.

After the experiment, the lining material 4 was peeled off from the pipeline 1 and the state of hardening was examined. At the position of the recess 3, it seemed that the hardening was slightly insufficient. Had met. Further, it is presumed that the water-pressing member 9 is operated from the initial stage of the heating, and the operating time of the water-pressing member 9 is further prolonged, whereby the hardening can be more sufficiently performed. In addition, portions other than the recess 3 were sufficiently cured without any problem.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention,
(A) is a center longitudinal cross-sectional view of a pipeline, (b) is an enlarged cross-sectional view of the bb part in (a).

FIG. 2 is a longitudinal sectional view at the center of a pipe used for a confirmation experiment of the present invention.

FIG. 3 is a graph showing a temperature rise of each part of the lining material in the above experiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pipeline 4 Lining material 9 Water pushing member

────────────────────────────────────────────────── ─── Continued on the front page (72) Eiji Kitagawa 3-183 Kyomachi, Fushimi-ku, Kyoto-shi, Kyoto Prefecture 507 Riviere Momoyama 507 (56) References JP-A-2-194932 (JP, A) JP-A-3-3 38324 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 63/00-63/48 F16L 55/16

Claims (1)

(57) [Claims] 1. A lining material (4) is inserted into a pipe (1), a pressurized fluid is fed into the lining material (4), and the lining material (4) is placed on the inner surface of the pipe (1). allowed pressure, as well as fed to heat pressurized gas from one end of the lining material (4) containing pressurized steam, over the entire length of the lining material (4), lining
Has a cross-sectional area of about 10 to 80% of the cross-sectional area in the
And rises to the drain retained in the lining material (4)
A liner lining, characterized by reciprocating a flexible pusher member (9) having a weight that does not cause the liquid collected at a terminal of the lining material (4) to be discharged at the terminal. Method