JPH09131792A - Lining method of pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely harden resin liquid infiltrated in a lining material by a method wherein drain is agitated with heating liquid so as to transmit the heat of gas under heat and pressure through the heating liquid to the lining material. SOLUTION: A lining material 4 is inserted in a pipeline so as to urge the lining material 4 to the inner surface of the pipeline 1 by feeding pressure fluid in the lining material 4. Further, gas under heat and pressure is fed from one end of the lining material 4 and, at the same time, a small amount of heating liquid are continuously or intermittently poured from the upper terminal of the lining material 4 so as to discharge the heating liquid from the lower terminal of the lining material 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates mainly to a method for lining a pipe line buried in the ground by applying a lining material, and particularly to a pipe line for a sewer pipe or the like. It is about.

[0002]

2. Description of the Related Art Generally, when lining a pipeline buried in the ground, a lining material is inserted into the pipeline and a heating and pressurized fluid such as pressurized steam is fed into the lining material. The lining material is expanded 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 to form a rigid pipe inside the pipeline. Is being done.

[0003]

However, among these pipes, a sewer pipe or the like is formed by connecting relatively short fume pipes and the like, and the contents flow according to the inclination of the pipe. The pressure resistance of the road is not very high, and the connections are often not highly airtight.

Therefore, in such a sewer pipe,
Due to the movement of the ground caused by the vibration of automobiles traveling on the road surface, the joints of the fume pipes may be displaced, and unevenness may occur in the up and down direction.There are recesses lower than both sides in the middle of the pipeline. Not often formed.

When lining a pipe having such a recess, drainage formed by condensation of pressurized steam fed into the lining material, water used for the lining work, etc. are retained in the recess. In the lower part of the recess, 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 drain removes heat from the lower portion in contact with the lining material and is cooled. Although the liquid surface of the drain is in contact with the pressurized steam, 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 transferred to the lining material.

Japanese Unexamined Patent Publication (Kokai) No. 5-200869 describes a method in which a nozzle for ejecting pressurized steam is moved into the lining material, and the lining material is heated by the pressurized steam ejected from the nozzle to cure the resin liquid. ing.

In this method, since the drain is blown off by the pressurized steam ejected from the nozzle or the drain is intensively heated by the pressurized steam, the insufficient heating due to the drain is less likely to occur as compared with the above method.

However, in this method, since the lining material is locally heated by the pressurized steam ejected from the nozzle, it takes a long time to heat and cure the lining material over the entire length, and the drainage remains. Since the liner is quickly cooled by the drain after passing through the nozzles in the easy places, it is necessary to slow the passing speed of the nozzles and blow the pressurized steam for a longer time in such places.

Even so, since it is not possible to know the location of the recesses from the outside, it is extremely difficult to intensively heat only the recesses where the drain tends to stay, and there are many such recesses. If present, each recess must be intensively heated, further increasing working time.

The present invention has been made in view of the above-mentioned circumstances, and in the case of an inner lining material for a conduit having a recess as described above, the inner lining material is efficiently heated by a heating / pressurizing fluid such as pressurized steam to obtain a resin. It is an object of the present invention to provide a method capable of reliably curing a liquid.

[0012]

According to the present invention, therefore, the lining material is inserted into a pipeline which is inclined as a whole because there is a difference in altitude between both ends, and a pressurized fluid is fed into the lining material to provide the lining material. The material is pressed against the inner surface of the pipe line, and heated pressurized gas is fed from one end of the lining material, and a small amount of heating liquid is continuously or intermittently injected from the upstream side end of the lining material, and the heating liquid. Is discharged from the downstream end of the lining material.

In the present invention, there is a difference in altitude between the two ends of the conduit, and it is necessary that the conduit be inclined as a whole. In general, a slight inclination is formed in the sewer pipe in order to allow the sewer to flow by itself, and the present invention is appropriately applied to such a sewer pipe.

However, this conduit does not have to be inclined so that the altitude is uniformly lowered from its upper end toward its lower end, and there may be an inclined portion in the opposite direction in the middle thereof. That is, the part that shifts from the forward slope to the reverse slope is the recess, and while having a forward slope as a whole, there are one to several reverse slope parts in the middle, and It is permissible that the place is formed.

As the pipeline to which the present invention is applied, it is suitable to apply it to the sewer pipe formed by connecting the short fume pipe or the like as described above. In such a sewer pipe, since the connection portion of the fume pipe is not strong, a recess is likely to be formed, and the effect of applying the present invention becomes clearer.

However, the present invention is not limited to application to sewer pipes, but is widely applied to pipelines buried in the ground, such as gas pipelines, water pipes, and laid pipelines for power lines and communication lines. can do.

Further, the present invention is particularly effective when there is a recess in the conduit, but the existence of such a recess is not essential, and if there is a possibility that a recess is formed in the conduit, the present invention It is preferable to apply the invention.

As the lining material in the present invention, an airtight flexible cylinder body coated with a reaction curable resin liquid is used. The structure of the cylinder is not particularly limited,
It is suitable to use a woven cloth, a nonwoven cloth, or a laminate of these materials, which has an airtight tube attached to the inner surface thereof, and the fiber layer is impregnated with a resin liquid.

As the lining material, it is also possible to use a sheet molding compound having a thickened thermosetting fiber in which fibers are dispersed. In short, as the lining material of the present invention, any material that forms a lining by curing a thermosetting resin can be used.

As the heated and pressurized gas in the present invention, generally, pressurized steam can be used, and a mixture of pressurized steam and compressed air can also be used. The heated and pressurized gas is fed from any end of the lining material, but it is preferably fed from the upstream end of the slope.

The pressure and temperature of the heated and pressurized gas are appropriately set depending on the withstand pressure and the degree of damage of the pipeline to be applied, the type of lining material used, the curing conditions of the curable resin liquid, etc. Is about 0.3 to ² kg / cm ² and the temperature is 100
It is suitable to set the temperature to about 130 ° C.

Further, it is suitable to use hot water as the heating liquid in the present invention. Although the temperature of the heating liquid varies depending on the conditions, it is preferably about 70 to 100 ° C. When pressurized steam is used as the heated pressurized gas, it is suitable to heat the water with steam from a boiler supplying the pressurized steam and use the hot water as the heating liquid.

The heated liquid is injected from the upstream end of the lining material, but it may be injected continuously or intermittently. It is necessary that the amount of the heated liquid injected is such that a drain formed therein can be stirred by the hot water flowing into the recess formed in the middle of the pipe. Specifically, although it depends on the thickness and inclination of the conduit, about 3 to 20 liters / minute is suitable for a 300 mmφ conduit.

[0024]

First, the lining material is inserted into the pipe line. As a method of inserting the lining material, the lining material may be pulled into the conduit, or the lining material with the inner and outer surfaces reversed may be inserted into the conduit while being turned upside down by fluid pressure. Then, a pressure fluid is fed into the lining material inserted in the pipeline, and the lining material is expanded and brought into pressure contact with the inner surface of the pipeline.

Then, a heating and pressurizing fluid is fed into the lining material, the lining material is heated by the heat of the heating and pressurizing gas, the reaction-curable resin liquid is cured, and a rigid FRP is provided inside the pipe line. Form a tube and line it.

In this process, the heated atmospheric pressure gas sent to the lining material is condensed by being deprived of heat by the lining material, and its drain flows under the lining material along the slope,
It is discharged at the downstream end of the slope. At this time, if there is a recess in the pipeline, the drain stays in the recess.

In the lining work, water may be used for various purposes in various processes such as inserting the lining material into the pipeline or pressing the lining material to the inner surface of the pipeline. If it remains in the lining material, it also stays in the recess together with the drain.

Here, in the present invention, since the heating liquid is injected from the upper end of the lining material, the heating liquid flows in the lower portion of the lining material along the slope. If there is a recess in the middle of which drain or the like has accumulated, the heated liquid flows into the recess to agitate the accumulated liquid such as drain, which mixes with the heated liquid, overflows from the recess, and is further inclined. Along the down stream.

In the lining material, the amount of drain generated by the condensation of the heated and pressurized gas is very small, and even if it flows down in the pipeline, it does not stir the drain accumulated in the recess. It just flows over its surface.

On the other hand, in the present invention, by actively injecting hot water to flow in the lining material, the drain in the recess is agitated and mixed by the force of the hot water. As a result, the heat of the hot water itself heats the lining material, and the stagnant liquid in the recess is agitated, causing the liquid to move up and down, taking in the heat of the heated pressurized gas from the surface and supplying it to the lining material. Therefore, the lining material is sufficiently heated.

That is, the heated liquid in the present invention is a heat source for heating the lining material by the heat of its own, and at the same time has the function of transferring the heat of the heated and pressurized gas to the lining material, and further stirring the drain or the like. Then, by mixing and mixing, it is possible to prevent the heat from being cut off by the drain and the like, and also to function as a medium for heat transfer from the heated and pressurized gas to the lining material.

When the heated liquid or the mixed liquid of the heated liquid and drain flows under the lining material, the flow becomes a turbulent flow, so that the lining material loses heat and is cooled or heated. Without shutting off the heat of the pressurized gas, it itself receives the heat from the heated and pressurized gas to maintain a sufficiently high temperature, and further transfers that heat to the lower lining material and flows.

Therefore, the temperature does not decrease as the heated liquid flows down, and even when applied to a long pipe, a small amount of heated liquid is sufficient and the number of recesses is reduced. It will not be affected.

The heated liquid flowing down to the downstream end of the lining material is discharged outside the lining material by an appropriate means such as a drain pipe.

[0035]

Therefore, according to the present invention, even if the drain or the like stays in the recess of the pipe, the drain or the like is agitated by the heating liquid and the heat of the heated and pressurized gas is sufficiently transmitted to the lining material. Heat is blocked by the staying liquid such as drain and the lining material is not sufficiently heated and the resin liquid is not insufficiently cured, so that the lining can be performed quickly and surely.

Further, even when it is applied to a long pipe line or when there are a plurality of recesses in the middle of the pipe line, it should be applied without considering the length of the pipe line and the number of recesses. And it is not necessary to consider the position of the recess,
The lining work can be performed extremely easily.

Further, in the present invention, the heating liquid is injected from the upstream end of the pipeline, and the heated and pressurized fluid is fed from the same end, so that the liquid is only discharged from the downstream end. The operator can operate the upstream side terminal, and can be applied even in a place where the operation on the downstream side terminal is difficult, such as a branch pipe.

[0038]

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

In this pipe line 1, the right end in the drawing is high and the left end is low, and an inclination difference of 220 mm is formed between both ends. Many of the Hume pipes 2 have a downward slope in the forward direction, but the third and fifth Hume pipes 2 from the right have a slope in the opposite direction to the upper left, and each has a depth of 14
mm and 28 mm recesses 3 are formed.

Reference numeral 4 denotes an lining material, which is inserted over the entire length of the pipe line 1, is expanded by a pressurized fluid, and is pressed against the inner surface of the pipe line 1. As the lining material 4, a non-woven fabric impregnated with an unsaturated polyester resin was used. The unsaturated polyester resin used had a curing property of 60 ° C. × 8 hr, 70 ° C. × 2 hr or 80 ° C. × 1 hr.

At the upper end of the lining material 4, a steam feed pipe 5 for feeding heated and pressurized gas and a hot water injection pipe 6 for injecting hot water as a heating liquid are attached. ing. An exhaust pipe 7 and a drain pipe 8 are attached to the lower end of the lining material 4.

FIG. 2 shows the heating and pressurized gas and hot water supply pipes, in which compressed air supplied from the compressor 9 and pressurized steam supplied from the boiler 10 are mixed in the chamber 11 and then mixed. The heated and pressurized gas is supplied to the steam inlet pipe 5. Further, the water in the water tank 12 is pumped up by the pump 13, and the mixed steam with the pressurized steam from the boiler 10 is heated by the mixer 14,
It is supplied to the hot water injection pipe 6 as hot water. 1 in the figure
Reference numeral 5 is a pressure gauge for measuring the pressure inside the lining material 4.

It is also possible to send only pressurized steam that does not mix compressed air into the steam inlet pipe 5, and the hot water supplied to the hot water inlet pipe 6 is hot water heated by another means. But it doesn't matter.

[Experiment 1] Pressurized steam pressure (1 kgf / cm ² ) was sent from the steam inlet pipe 5, hot water was not injected from the hot water injection pipe 6, and only the heated and pressurized gas was used as the lining material. Was heated for 2 hours.

[Experiment 2] In the same manner as in Experiment 1, pressurized steam was introduced from the steam inlet pipe 5 and hot water injection pipes 6 to 80 were used.
Hot water at ˜90 ° C. was continuously injected at a rate of 6 liters / minute and heated for 2 hours.

[Experiment 3] In the same manner as in Experiment 1, pressurized steam was introduced through the steam inlet pipe 5 and hot water inlet pipes 6 through 80.
Hot water at ˜90 ° C. was continuously injected at a rate of 20 liters / minute and heated for 2 hours.

Temperature sensors are attached to the lowermost and upper portions of the recess 3 formed at the joints of the fourth and fifth Hume pipes 2 from the right in FIG. 1, and the outside of the lining material 4 of the recess 3 in both experiments. The change in surface temperature was measured and the results are shown in Fig. 3.
Is shown in the graph. The temperatures of the upper portion of the lining material 4 were almost the same in Experiments 1, 2 and 3, and therefore the average value thereof is shown in the graph.

After each experiment, the lining material 4 was peeled from the pipe line 1 and the cured state of the lining material 4 in the recess 3 was examined.

As a result, in Experiment 1, as shown in FIG. 3, the outer surface temperature of the lining material 4 in the recess 3 was 55 at maximum.
The temperature increased only to 0 ° C., and the lining material 4 in the recess 3 was not sufficiently cured.

On the other hand, in Experiments 2 and 3, the outer surface temperature of the lining material 4 in the recess 3 was increased to about 80 ° C., and the temperature rise was almost the same as the upper portion of the lining material 4. . As a result of peeling off the lining material 4 and examining the cured state, the lining material was sufficiently cured.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing a state of being lined in a pipeline used for a confirmation experiment of the present invention.

FIG. 2 is a piping diagram for supplying heated pressurized gas and hot water to the lining material in the experiment of FIG.

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

[Explanation of symbols] 1 Pipe line 4 Lining material

Front page continuation (72) Inventor Eiji Kitagawa 3-183, Kyomachi, Fushimi-ku, Kyoto-shi, Kyoto Riviere Momoyama 507

Claims (1)

[Claims] 1. A lining material (4) is inserted into a pipe line (1) which has a height difference between both ends and is inclined as a whole, and a pressurized fluid is fed into the lining material (4) to provide the lining material. The material (4) is brought into pressure contact with the inner surface of the pipe (1), and heated and pressurized gas is introduced from one end of the inner material (4), and at the same time, the inner material (4).
A method for lining a pipeline, characterized in that a small amount of heating liquid is continuously or intermittently injected from the upstream end of the pipe and the heating liquid is discharged from the downstream end of the lining material (4).