JPS6340995B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides lining for the purpose of repairing or reinforcing underground pipes, such as gas pipes, water pipes, telephone lines, power lines, etc., which are mainly buried underground. It is related to the method of application.

Since then, this type of lining method involves inverting a flexible cylindrical lining material using a pressure fluid such as compressed air, inserting this lining material into the pipe, and simultaneously applying adhesive that has been applied to the inner surface of the lining material in advance. A method is known in which this lining material is adhered to the inner surface of the pipe via an agent to line the pipe. This method can line long pipes in an extremely short period of time, can be used even if there are bends in the pipe, and there are few problems during the work, so it is basically an extremely superior method. This is a method that has received particular attention in recent years.

However, in this method, it is necessary to apply an adhesive to the inner surface of the lining material in advance. Therefore, when selecting the type of adhesive, it is important to note that in the case of the above method, the lining material and the pipe are bonded along their entire circumference, and both the lining material and the pipe are airtight. Therefore, adhesives that contain volatile components such as solvents and dispersion media cannot be used, and it is virtually impossible to use adhesives other than reaction-curing adhesives. . However, when using reactive curing adhesives, the relationship between curing time and pot life of the adhesive must always be considered.

After applying the adhesive to the lining material, it usually takes at least 3 to 5 minutes to complete the inversion into the pipeline.
The adhesive needs to have a pot life longer than that. However, on the other hand, adhesives with a long pot life naturally require a long curing time, and the pot life is 3 to 3.
A 5 hour adhesive usually requires 1 to 2 days to completely cure at room temperature. Therefore, although the lining method described above significantly reduces the time required for the work, it takes a long time for the adhesive to harden, which reduces the effectiveness of the method.

It has been considered that after lining the pipes, hot air or pressurized steam is pumped into the lining material to heat it and accelerate the curing of the adhesive, but this still takes several hours. This is the current situation. Further, the heating process is time-consuming and the equipment required is also large-scale.

Furthermore, although the work time is said to be 3 to 5 hours as mentioned above, this is only the time required if the work is carried out smoothly, and the time required may vary depending on geographical conditions, the state of buried pipes, and other conditions. It may take a long time, and it is often the case that some kind of trouble occurs during the work, making it take even longer. Furthermore, the pot life and curing time of reaction-curing adhesives are delicately adjusted, and their handling requires considerable skill, so it is not recommended to mix them and apply them to the inner surface of the lining material at the lining work site. It is desirable to mix the adhesive in a factory with specialized equipment, apply it to the inner surface of the lining material, and then transport the lining material to the work site for lining work. It takes time.

Considering these circumstances, it is necessary to use an adhesive with a sufficiently long pot life for safety reasons, and the curing time must be even longer.

The present invention was developed in view of the above circumstances, and by storing the lining material in a cooling atmosphere until the reversal insertion work is started and extending the pot life of the adhesive, the adhesive has a short pot life at room temperature. In addition to allowing time for mixing the adhesive, the adhesive is quickly cured at room temperature or under heating after the lining material is reversely inserted into the pipe, and the curing time of the adhesive is shortened. The purpose of this project is to shorten the overall construction time, including construction time.

Accordingly, the present invention injects a reaction-curing adhesive from one end of a flexible cylindrical lining material, passes the lining material through a nip roller, and adjusts the amount of adhesive applied to the inner surface of the lining material over its length. The lining material coated with adhesive on its inner surface is then introduced into a cold container maintained in a cool atmosphere by blowing liquefied carbon dioxide into the container, and the lining material is applied to the inner surface along its entire length. The above-mentioned adhesive is applied and placed in the above-mentioned cold insulating container, and the cold insulating container containing the lining material is maintained in a cooling atmosphere with liquefied carbon dioxide gas while the cold insulating container is transported to a construction site, and then the lining material is installed at the construction site. One end of the material is pulled out from the cold storage container and fixed in an annular shape, and while fluid pressure is applied to the rear part of the annular fixed part of the lining material, the lining material is turned from inside to outside at the folded part of the lining material formed there. The folded portion is advanced from one end of the pipe to the other end, and the inverted lining material is pressed onto the inner surface of the pipe via the adhesive by the fluid pressure, and the adhesive is cured. It is characterized by bonding the lining material and the conduit.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the process of applying adhesive to the lining material. Reference numerals 1 and 2 are first and second cold storage containers, respectively, and at the top thereof there are spouts 5, which are connected to liquefied carbon dioxide gas cylinders 3, 4.
5, 5, 6, 6, 6 are provided. Rotatable reels 7 and 8 are attached to each of the cold storage containers 1 and 2, and lining material outlet ports 9 and 10 are provided on the side walls, and guide rollers 11 and 12 are provided inside the reels.
is provided.

The lining material 13 is wound around the reel 7 in the first cold storage container 1 in a flat folded state. Liquefied carbon dioxide gas is blown into the first cold container 1 from the cylinder 3 through the spout ports 5, 5, 5, and the inside of the cold container 1 is maintained in a cooling atmosphere, and the lining material 13 therein is cooled. has been done. On the other hand, liquefied carbon dioxide gas is blown into the second cold storage container 2 from the cylinder 4 through the spout ports 6, 6, 6, and the inside is maintained in a cooling atmosphere.

The cooled lining material 13 is unwound from the reel 7, guided by the guide roller 11, and drawn out of the first cold container 1 through the lining material outlet 9. Then, a reaction curing adhesive 14 is injected into the lining material 13 from its tip, and the adhesive 1
4 is formed in the adhesive reservoir 15. The adhesive reservoir 15 is placed on a roller conveyor 16 so that the lining material 13 can move to the right in the figure.

The tip of the lining material 13 is folded flat again,
It passes between a pair of nip rollers 17, 17. The lining material 13 at this time is the nip roller 17,
17 to adjust the amount of adhesive that adheres to the lining material 13 and is applied to its inner surface. Next, the lining material 13 whose inner surface is coated with adhesive is guided by the guide rollers 12 from the lining material outlet 10, enters the second cold storage container 2, and is wound around the reel 8.

When the reel 8 is driven in this state, the cooled lining material 13 is sequentially paid out from the reel 7, comes out of the first cold container 1, passes through the adhesive reservoir 15 on the roller conveyor 16, and is coated with adhesive 14 on the inner surface. is applied, the amount of coating is adjusted by nip rollers 17, 17, it enters the second cold storage container 2 again, and is wound around the reel 8 while being cooled again. Therefore, since the adhesive 14 is cooled in the second cold storage container 2, the reaction rate of the adhesive 14 becomes slow and the pot life becomes longer.

The above steps are performed in a well-equipped factory, and the cold container 2 containing the lining material 13 whose inner surface is coated with the adhesive 14 is transported to the lining construction site. Even during transportation, in order to prevent the temperature of the adhesive 14 from rising, liquefied carbon dioxide gas is blown out from the spout ports 6, 6, 6 periodically or as needed to create a cooling atmosphere inside the cold storage container 2. It is desirable to maintain the

Next, FIG. 2 shows an example of the process of lining a pipe using the lining material 13 housed in the cold storage container 2 at a lining construction site. Reference numeral 18 in FIG. 2 is a pressure vessel, the tip of which is connected to a flexible guide tube 19, and the tip of the guide tube 19 penetrates into the working hole 20.
It is connected to the terminal of the conduit 21. Also, at the rear end of this pressure vessel 18, a flat lining material 1 is provided.
A slit 22 through which the pressure vessel 18 can pass is formed, and a pressure fluid inlet 23 is provided in the side wall of the pressure vessel 18.

Thus, the lining material 13 housed in the cold container 2
is first pulled out from the lining material outlet 10 with one end guided by the guide roller 12, inserted into the pressure vessel 18 through the slit 22, penetrates the pressure vessel 18, further passes through the guide pipe 19, and then exits the guide pipe. It is fixed to the tip of 19 in a ring shape. When a pressure fluid such as compressed air is fed from the pressure fluid inlet 23 in this state, the pressure passes through the guide pipe 19 and pressurizes the rear part of the annular fixed portion of the lining material 13 from the outside.

As a result, the lining material 13 is inverted so that the inside becomes the outside at the folded part 24 formed on the annular fixed part, and the folded part 24 is turned over so that the inside becomes the outside.
4 advances through the pipe 21 from one end to the other, the inverted lining material 13 is inserted into the pipe 21, and the adhesive 14 applied to the inner surface is transferred to the outer surface. It is pressed onto the inner surface of the conduit 21 via the adhesive 14. In this way, the lining material 13 is continued to be reversed, the lining material 13 is reversed over its entire length, and the lining material 13 is inserted over the entire length of the conduit 21 and crimped.

After this, if the lining material 13 is left to stand while maintaining the fluid pressure, since the temperature of the pipe line is room temperature, the adhesive will harden according to its behavior at room temperature.
The lining material 13 and the conduit 21 are firmly bonded.

Furthermore, if the curing speed of the adhesive 14 at room temperature is not sufficiently fast, a heated atmosphere may be formed within the lining material 13 press-bonded to the conduit 21 to accelerate the curing of the adhesive. Lining material 1
When forming a heated atmosphere inside the lining material 13
Although it is possible to directly send hot air or pressurized steam into the pipe, the following method is recommended in order to heat the pipe almost uniformly so that there is no large temperature unevenness over the entire length of the pipe. is suitable.

That is, a hose having numerous pinholes formed on its outer periphery along its entire length is inserted into the lining material 13, pressurized steam is fed into the hose, and the pressurized steam is passed through the pinholes of the hose to the hose and the lining material. 13, and the lining material 13
This creates a heated atmosphere inside. According to this method, the entire inside of the lining material is heated almost uniformly, and is heated appropriately without being overheated more than necessary, so the adhesive hardens quickly and firmly. There is no possibility of thermal deterioration of the lining material.

When inserting the hose into the lining material 13, connect the hose to the free end of the lining material 13 while inverting the lining material 13 and inserting it into the conduit 21, and as the lining material 13 is being reversed. By simultaneously drawing the hose into the inverted lining material, the intended purpose can be achieved without requiring any special process for inserting the hose.

FIG. 3 shows a pipe 2 using the lining material 13.
1 shows another example of the process of lining the inner surface. A guide pipe 19 is directly connected to the front of the lining material outlet 10 of the cold storage container 2, and the distal end of the lining material 13 is annularly fixed to the distal end of the guide pipe 19 and connected to the end of the conduit. In this state, by feeding pressure fluid into the cold storage container 2 from the pressure fluid inlet 23, the lining material 13 is
can be crimped onto the inner surface of the conduit 21 while being inverted.

In this case, liquefied carbon dioxide gas for cooling may be used as is as the pressure fluid when the lining material 13 is reversed, and the lining material may be reversed using the pressure while forming a cooling atmosphere. In this way, the lining material 13 that has not yet been turned over advances into the cooling atmosphere even after coming out of the cold storage container 2, and reaches the folded part 24 while remaining cooled, causing the adhesive 14 to harden quickly. The trouble caused by this will be reduced.

When reversing the lining material 13, the reversal may proceed by the pressure of the fluid applied to the folded portion 24 as described above, but a flexible string, such as a string, belt, or rope, may be placed in the lining material 13 in advance. The lining material 13 is reversed by inserting a long object in the form of a cord and pulling it through the pipe 21 while applying fluid pressure to the rear part of the fixed part. You can also proceed. In this way, there is no need to make the fluid pressure higher than necessary, and the pressure is always constant and does not change much, and the rate of progress of reversal is also constant, so that the lining is maintained in a uniform state over the entire length of the pipe. can do.

According to the present invention, since the lining material 13 coated with the adhesive 14 is housed in a cooling atmosphere, the adhesive 14 is cooled and has a longer pot life. You can proceed with the work safely without fear of changes. It is especially effective during the summer.

For example, if an adhesive with a pot life of 3 hours at 20° C. is used and the temperature of the cold container 2 is maintained at about 5° C., the pot life will be extended to about 7 to 8 hours. Therefore, there is sufficient time to complete the lining work after preparing the adhesive, and the work will not become impossible due to the adhesive hardening during the work. Furthermore, if the lining material 13 is crimped into the pipe and then heated to about 60° C. using the method described above, the adhesive will be completely cured in about one hour. According to the conventional method, the pot life was about 3 hours, leaving little time for work, and if a problem occurred during lining work, the adhesive would immediately begin to harden, making work impossible. According to the invention, there is sufficient time to proceed with the work safely.

It is also possible to use an adhesive with a short pot life and short curing time, which could not be used with conventional methods, and to cure the adhesive at room temperature after pressing the lining material onto the inner surface of the pipe. For example, if you use an adhesive that has a pot life of about 1 hour at 20°C and a curing time of about 10 hours at the same temperature, and store the lining material 13 coated with this adhesive in a cold container maintained at 0°C, the pot life will be approximately 1 hour. is about 4
Stretch in time. Therefore, the work can be completed safely without the adhesive being hardened during the work. If the fluid pressure within the lining material 13 is then left to stand, the adhesive will harden in about 10 hours, and the lining is completed. In this case as well, curing is accelerated by heating, and by heating to 60°C, it is possible to complete adhesion in a short time of about 20 to 30 minutes.

Furthermore, in the past, due to the time required for the work and the pot life, it was necessary to apply the adhesive 14 at the lining work site, which also required the preparation of the adhesive, which was difficult to control, to be done on site. I didn't get it. However, according to the present invention, by lowering the temperature inside the cold container 2 sufficiently, it is possible to extend the pot life of the adhesive to 24 hours or even longer. This makes it possible to prepare a lining material 13 coated with adhesive 14, transport it to a work site while cooling it in a cold container 2, and provide the lining material. In addition, by applying the adhesive in a well-equipped factory, it is possible to control the adhesive's pot life and curing time, making it possible to use adhesives that have a fairly short curing time at room temperature. This makes it possible to significantly shorten the overall work time at the lining work site.

In the above-mentioned embodiment, the lining material 13 was stored in the first cold container 1 before the adhesive 14 was applied, and was pulled out from there for the application of the adhesive 14. It is not necessary, and the lining material may be kept at room temperature before applying the adhesive. However, it goes without saying that it is preferable to cool this lining material in advance as in the previous example from the standpoint of cooling efficiency in the second cold storage container 2.

The temperature inside the cold container 2 in the present invention cannot be determined unconditionally depending on the outside temperature, the type of adhesive, the working method, etc., but if the temperature is set at least 10 degrees Celsius lower than the outside temperature, then Some effects will occur.

In the present invention, the most suitable method for maintaining a cool atmosphere inside the cold storage container is to blow liquefied carbon dioxide into the cold storage container, as described in the previous embodiment. It is possible to use liquefied fluorocarbons or liquefied nitrogen instead of liquefied carbon dioxide, but they are expensive, and liquefied nitrogen has too high a cooling effect, increases the viscosity of the adhesive, and makes the lining material hard. On the contrary, this is not desirable. It is also possible to place dry ice in the cold storage container 2 for cooling.
The temperature inside the cold storage container 2 is highly uneven, making it impossible to uniformly cool the entire container.

The adhesive used in the present invention needs to be a reaction-curing adhesive as described above, and an epoxy two-component reaction-curing adhesive is most suitable. It is difficult to adjust the pot life of acrylic adhesives. Further, unsaturated polyester adhesives use peroxide as a reaction initiator, but the presence of water, oil, etc. may cause the peroxide to react, slowing down the curing reaction. In urethane adhesives, the isocyanate may react with water and may not harden.

The lining material may be a flexible rubber or plastic tube, but in order to reinforce the pipe and make it durable, it is recommended that the outer surface (becomes the inner surface after inversion) of the tubular fabric be lined with flexible rubber or plastic. It is preferable to use a material with a film formed of an elastic material such as . Elastic materials include gas impermeable, weather resistant,
Polyester elastomers (Hytrel manufactured by DuPont, Perprene, Toyobo Co., Ltd.), which have excellent properties such as water resistance, oil resistance, chemical resistance, heat resistance, and cold resistance, and have high strength and flexibility, are suitable. Further, polyester synthetic fibers having excellent adhesion to the polyester elastomer are suitable for the cylindrical fabric.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing the process of applying adhesive to the lining material according to the present invention. FIGS. 2 and 3 are longitudinal cross-sectional views showing an embodiment of the process of inserting the lining material into the pipe while inverting it according to the present invention. 1, 2...Cold container, 13...Lining material, 14
...Adhesive, 17...Nip roller, 18...
Pressure vessel, 21... pipe line, 24... folded part.

Claims (1)

[Scope of Claims] 1. A reaction curing adhesive is injected from one end of a flexible cylindrical lining material, and the lining material is passed through a nip roller while adjusting the amount of adhesive applied to the inner surface of the lining material over its length. The lining material coated with adhesive on its inner surface is introduced into a cold container maintained in a cool atmosphere by blowing liquefied carbon dioxide into the container, and the lining material is coated with adhesive on its inner surface along its entire length. The cold container containing the lining material is coated with adhesive and placed in the cold container, and the container is transported to a construction site while maintaining a cooling atmosphere with liquefied carbon dioxide. One end is pulled out from the cold storage container, passed through the pressure container, and fixed in an annular manner to the tip of the pressure container, and pressure fluid is fed into the pressure container to apply fluid pressure to the rear of the annular fixed portion of the lining material. While acting, invert the lining material so that the inside becomes the outside at the folded part of the lining material formed there, and advance the folded part from one end of the pipe to the other end,
A method for lining a conduit, characterized in that the inverted lining material is pressed against the inner surface of the conduit via the adhesive by the fluid pressure, and the adhesive is cured to bond the lining material and the conduit. 2. The lining material is stored in a first cold container maintained in a cool atmosphere in advance and cooled, and the lining material is sequentially pulled out from the cold container, an adhesive is applied to the inner surface, and the material is passed through a nip roller. The method for lining a pipe line according to claim 1, characterized in that the method is sequentially introduced into a second cold storage container. 3. Insert a string-like long object into the lining material over its entire length in advance, and turn the lining material over by passing the string-like long object protruding from the folded part of the lining material through the pipe and pulling it. A method for lining a pipe according to claim 1, characterized in that the folded portion of the pipe is advanced into the pipe. 4. After inverting and inserting the lining material over the entire length of the pipe, apply fluid pressure to the lining material to press the lining material to the inner surface of the pipe, and leave it at room temperature to harden the adhesive. A method for lining a pipe line according to claim 1. 5. After inverting and inserting the lining material over the entire length of the pipe, fluid pressure is applied within the lining material to press the lining material to the inner surface of the pipe while heating the lining material,
A method for lining a pipe according to claim 1, characterized in that the adhesive is cured. 6. Insert a hose having a large number of pinholes on its outer periphery into the lining material crimped onto the inner surface of the pipe, feed pressurized steam into the hose, and pass the pressurized steam through the pinholes between the hose and the lining material. 6. The method of lining a pipe according to claim 5, wherein the lining material is heated by allowing the lining material to leak during a period of time. 7. When the lining material is reversed, the hose is connected to the free end of the lining material, and as the lining material is reversed, the hose is drawn into and inserted into the reversed lining material. A method for lining a pipe according to scope 6. 8. The method for lining a pipe according to claim 1, wherein the adhesive is an epoxy two-component reaction-curing adhesive. 9 Injecting a reaction-curing adhesive from one end of a flexible cylindrical lining material, moving the lining material in the length direction while adjusting the amount of adhesive applied to the inner surface of the lining material through a nip roller, The lining material coated with an adhesive on its inner surface is sequentially introduced into a cold container maintained in a cool atmosphere by blowing liquefied carbon dioxide into the interior, and the adhesive is applied to the inner surface of the lining material over its entire length. The cold insulating container containing the lining material stored in the cold insulating container is maintained in a cooling atmosphere with liquefied carbon dioxide gas while the cold insulating container is transported to the construction site, and one end of the lining material is then placed in the cold insulating container at the construction site. The lining material is annularly fixed to the tip of the lining material outlet of the container, and is formed thereon by supplying pressure fluid into the cold storage container to apply fluid pressure to the rear part of the annular fixed portion of the lining material. At the folded part, the lining material is reversed so that the inside becomes the outside, and the folded part is advanced from one end of the pipe to the other end, and the reversed lining material is attached to the pipe through the adhesive by the fluid pressure. A method for lining a pipe line, which is characterized by bonding the lining material and the pipe line by crimping the inner surface and curing the adhesive. 10 The lining material is stored and cooled in a first cold container maintained in a cool atmosphere in advance, and the lining material is sequentially pulled out from the cold container, an adhesive is applied to the inner surface, and the material is passed through a nip roller. The method for lining a pipe line according to claim 9, characterized in that the method is sequentially introduced into a second cold storage container. 11 A long string-like object is inserted into the lining material over its entire length in advance, and the lining material is turned over by pulling the long string-like object protruding from the folded part of the lining material through the pipe. 10. The method for lining a pipe according to claim 9, characterized in that the folded portion is advanced within the pipe. 12. After the lining material is reversed and inserted over the entire length of the pipe, fluid pressure is applied within the lining to press the lining material to the inner surface of the pipe, and the lining material is left at room temperature to harden the adhesive. A method for lining a pipe line according to claim 9. 13 After inverting and inserting the lining material over the entire length of the pipe, fluid pressure is applied within the lining material to press the lining material to the inner surface of the pipe while heating the lining material and curing the adhesive. A method for lining a pipe according to claim 9, characterized in that: 14 Insert a hose having numerous pinholes on its outer periphery into the lining material crimped onto the inner surface of the pipe,
Claim 13, characterized in that the lining material is heated by feeding pressurized steam into the hose and causing the pressurized steam to leak between the hose and the lining material through the pinhole. Method for lining pipes as described in section. 15. When the lining material is reversed, a hose is connected to the free end of the lining material, and as the lining material is reversed, the hose is drawn into and inserted into the reversed lining material. A method for lining a pipe according to Scope 14. 16. The method for lining a pipe according to claim 9, wherein the adhesive is an epoxy two-component reaction-curing adhesive.