JPS5856334B2 - Method of lining pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lining existing pipes, such as gas pipes, water pipes, sewer pipes, or buried pipes such as electric cables or telephone lines.

As these pipelines age, and in order to prevent damage to these pipelines due to earthquakes and the like, consideration is being given to repairing or reinforcing these existing pipelines by lining them with linings.

Various methods have been devised for lining the lining, and one method is to use a flexible cylindrical lining material (
A plastic tube or a rubber or plastic tube reinforced with reinforcing cloth.

) is inserted into the pipe while being turned over with pressure fluid, and at the same time the lining material is brought into close contact with the inner surface of the pipe.

This method allows the lining material to be easily inserted into the pipe and can be done in a short time, the pipe and the lining material can be easily bonded together, and it can be carried out regardless of whether the diameter of the pipe is large or small. It has been attracting particular attention recently because of its advantages such as the fact that it can be carried out even if there are curved parts in the pipe.

Furthermore, as a method for the above-mentioned reverse insertion, there is an invention disclosed in Japanese Patent Application No. 113252/1983, which was previously filed by the present applicant.

This involves passing a lining material through a pressure vessel, fixing the tip of the lining material in an annular shape to the tip of the pressure vessel, and introducing pressurized fluid into the pressure vessel to pressurize the annular fixed portion of the lining material. , the folded portion formed there is advanced in the pipe line, the lining material at the rear of the pressure vessel is sequentially advanced to pass through the pressure vessel, and the folded part (here) is passed through the pipe line. This is a method of lining the entire length of the pipe with a lining material by inverting it and bringing it into close contact with the inner surface of the pipe.

However, in this method, the reversal speed of the lining material changes significantly during the reversal insertion process.

In other words, as the reversal progresses, the lining material that has not yet been reversed moves inside the lining material that has already been reversed, but the frictional resistance between the two gradually increases in the first half of the reversal.
The reversal speed gradually decreases.

However, when the lining material is inverted by exactly half and the free end of the lining material is drawn into the pressure vessel, the resistance to the lining material's entry into the pressure vessel disappears, and the rate of inversion increases rapidly.

Thereafter, the frictional resistance between the lining material that has not yet been reversed and the lining material that has already been reversed gradually decreases, and in the latter half of the reversal, the reversal speed increases and the reversal occurs rapidly.

In the first half of the reversal, it is possible to adjust the reversal speed by manipulating the lining material extending to the rear of the pressure vessel, but in the second half, it becomes completely uncontrollable.

It is possible to adjust the reversing speed by adjusting the fluid pressure, but this is actually extremely difficult, and if the reversing speed is accidentally reduced too quickly, the lining material that has not yet been reversed will become folded due to inertia. It got clogged and stopped reversing.
In the worst case, even if pressure is applied again, it will not be possible to continue reversing, and it will also be impossible to pull out the lining material and reinsert it.

Further, as mentioned above, it is not preferable that the reversal speed changes significantly.

In particular, it should be avoided that the reversal speed becomes excessively high.

For example, if there are unevenness in the pipe, if the reversal speed is too fast, the lining material will not follow the unevenness, leaving a space between the lining material and the pipe, which may narrow the pipe. be.

In addition, if adhesive is applied to the inner surface of the lining material and then glued to the inner surface of the pipe at the same time as the inversion, the adhesive may be applied unevenly or the lining material may not align properly with the inner surface of the pipe. It may not be possible to bond.

Further, if there is a bend in the conduit, the reversal speed decreases at that portion, but at this time, as described above, the folded portion may become clogged and the reversal may not proceed.

In addition, in the latter half of the inversion, the inversion takes place in a conduit that is completely invisible from the outside, and it is completely impossible to know from the outside the speed of the inversion or how far the inversion has progressed.

Therefore, the operation has to depend on the operator's intuition, and even if a problem occurs in the pipeline, there is no way to know its location or situation, and there is no way to resolve the problem, which is inconvenient. There are many points.

Therefore, in the present invention, a string-like material having a length equal to or longer than the pipe length is further connected to the free end of the lining material, and a delivery speed control is provided at the rear of the pressure vessel, and the lining material and the string-like material are connected to the free end of the lining material. In addition to adjusting the reversal speed, the string-like material can be used to solve problems.

The present invention will be explained below with reference to the drawings.

In the drawings, 1 is a flexible cylindrical lining material.

Reference numeral 2 denotes a pressure vessel, a mouthpiece 3 is fixed to the front end thereof, and a slit 4 is bored in the wall surface of the rear end.

Reference numeral 5 denotes a swing valve pivotally supported above the slit 4 on the inner surface of the rear end wall of the pressure vessel, so that when the valve swings downward, the length of the slit 4 becomes smaller. A notch 6 is formed.

7 is a pressure fluid introduction port. The cap 3 has flanges 8, 8
' to be fixed to the conduit 9.

10 is a delivery speed control device provided at the rear of the pressure vessel 2, and includes a pair of rollers 11. Consisting of it',
This roller is actively driven by a motor 12.

Note that the delivery control device 10 only needs to be located behind the annular fixed portion of the lining material 1, and may be provided inside the pressure vessel 2.

Reference numeral 13 denotes a reel, on which is wound a flexible string-like material 14 that is equal to or longer than the length of the pipe, and the tip of this string-like material 14 is connected to one end of the lining material. The lining material 1 is placed on the reel 13 following the string material 14.
is being wound.

As the string-like object, a long object having flexibility and appropriate toughness, such as a rope, string, tape, or belt, is used.

The tip of the lining material 1 is pulled out from the reel 13, passed over the rollers 11° and 11' of the feed speed control device 10 in an S-shape, and then inserted into the pressure vessel 2 through the slit 4 of the pressure vessel 2. .

At this time, the swinging piece 5 is lifted up by the lining material 1 as shown in the figure.

The lining material 1 passes through the pressure vessel 2, and its tip is fixed in an annular shape by a base 3.

After that, pressure fluid is introduced from the introduction lower, and pressure fluid is introduced into the pressure vessel 2.
Pressurize the inside.

Next, when the motor 12 is activated to rotate the rollers 11.11' of the feed-out speed control device 10, the lining material 1 is unwound from the reel 13 at a predetermined speed and fed forward.

Thus, the folded portion 15 of the lining material 1 is folded by the pressure fluid.
are sequentially advanced, and the lining material 1, which has been inverted at the folded portion 15, is brought into close contact with the inner surface of the conduit 9 as shown by the chain line, thereby forming the lining.

In the present invention, since the feeding speed of the lining material 1 is controlled by the feeding speed control device 10, the speed of reversing the lining material 1 can be freely adjusted, and troubles may occur due to the reversing speed becoming excessively fast. There isn't.

After the reversal progresses and the lining material 1 is drawn into the full length pressure vessel, the reversing speed is controlled by the string-like material 14 connected to the lining material 1, and the reversing speed is controlled over the entire length of the lining material 1. It is possible.

Note that when the rear end of the lining material 1 passes through the slit 4, the swinging valve 5 swings, and the string-like material 14 fits into the notch 6, leaving only a portion through which the string-like material 14 can pass. This closes the slit 4 and prevents leakage of pressure fluid from the slit 4.

According to the present invention, since the reversing speed can be freely adjusted, reversing can be performed at the most suitable constant speed, the reversing speed does not become excessively fast, stable reversing insertion is possible, and the reversing The lining material 1 properly adheres to the inner surface of the conduit.

In addition, by injecting adhesive into the lining material 1 behind the feed speed control device 10, the adhesive is continuously applied to the lining material 1, and the lining material 1 is transferred to the pipe line 9 at the same time as the reversal. It is also possible to adhere the lining material 1 to the inner surface of the conduit 9, in which case there will be no uneven application of the adhesive.
can be adhered correctly along the inner surface of the

Also, during the reversal insertion, by checking the condition of the lining material 1 and the string-like material 14 at the rear of the pressure vessel 2, it is possible to know to what extent the reversal has progressed, and also to check the progress of the reversal. It is also possible to check.

Furthermore, when there is a bend in the pipe, the reversal speed at this bend decreases; however, according to the method of the present invention, if the position of the bend is known in advance, the fluid will flow when it approaches the bend. It is possible to increase the pressure and pass through bends without trouble.

In addition, if a problem occurs for some reason during the reverse insertion and it becomes impossible to continue the reversal, the reversing position can be adjusted by pulling the string-like object 14 backward while applying pressure in the pressure vessel. It is also possible to continue the reversal by moving backward and reversing again.

In the worst case, it is possible to pull back all of the lining material 1. In this case, the lining material may be wasted, but the pipe itself will not be damaged, and a new You can start over again using lining material.

Furthermore, in the conventional method described above, if the advancing speed of the lining material is adjusted by simply connecting a string to the rear end of the lining material, even after the lining material has been drawn into the slit, the string will The swing valve is held in an open state by the string-shaped object, and the slits on both sides of the string-like object are opened, and the pressure fluid sent into the pressure vessel leaks from the open portion of the slit. However, according to the present invention, a notch is formed in the swing valve so that the rear end of the lining material passes through the slit. Later, when the string-like object fits into the notch of the swing valve, the swing valve swings downward, closing both sides of the slit to prevent pressure fluid from leaking, and the string-like object can pass through the notch, thereby performing this function without the drop in fluid pressure required to turn the liner inside out.

In the present invention, the pressure of the fluid should be higher than the pressure required to invert the lining without any control, otherwise sag will occur between the pressure vessel and the delivery rate control device. This does not make sense for the present invention.

Further, by increasing the fluid pressure and feeding the lining material at a low speed, the inverted lining material is properly lined along the inner surface of the pipe, and a good result can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view schematically showing an example of the state of implementation of the present invention, and FIG. 2 is a perspective view of a swing valve. 1... Lining material, 2... Pressure vessel, 5
...Swinging valve, 6...Notch, 9...
... Pipe line, 10 ... Delivery control device, 1
4... String-like object.

Claims (1)

[Claims] 1. A flexible cylindrical lining material is passed through the pressure vessel, the tip of the lining material is fixed to the tip of the pressure vessel in an annular shape, and a pressurized fluid is introduced into the pressure vessel to fix the lining material in the annular shape. The portion is pressurized, the folded portion formed thereon is advanced through the pipe line, the lining material at the rear of the pressure vessel is sequentially advanced to pass through the pressure vessel, and further passed through the pipe line to reach the folded portion. In this method, the entire length of the pipe is lined with a lining material by inverting the pipe and bringing it into close contact with the inner surface of the pipe. A string-like material is connected, and a feed-out speed control device is provided behind the annular fixed portion to adjust the advancing speed of the lining material and the string-like material, and a folded portion is inserted into the pressure vessel at the adjusted speed. A swinging valve having a notch is provided in the slit for introducing the lining at the rear of the pressure vessel, and the lining material pushes up the swinging valve while pushing up the swinging valve. After the rear end of the lining material passes through the slit, the swing valve closes the slit to prevent leakage of the pressurized fluid, and the string-like material passes through the notch. A method for lining a conduit, characterized in that the lining material is turned inside out.