JPS5838088B2 - 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 this lining material is adhered to 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.

As a method for the above-mentioned reverse insertion, there is an invention disclosed in Japanese Patent Application No. 113'019/1983, which was previously filed by the present applicant.

This involves passing the lining material through the pressure vessel, fixing the tip of the lining material in an annular manner to the tip of the pressure vessel, and sealing an adhesive in the lining material at the rear of the pressure vessel. A pressurized fluid is introduced to pressurize the annular fixed part of the lining material, and the folded part formed there is advanced in the pipe line, and the lining material at the rear of the pressure vessel is sequentially advanced to apply adhesive to its inner surface. The lining is applied over the entire length of the pipe by applying the adhesive, passing it through the pressure vessel, passing it through the pipe, inverting it at the folded part, and adhering it to the inner surface of the pipe with an adhesive. This is a method of lining the interior with wood.

However, in this method, the adhesive is sealed in the lining material behind the pressure vessel, so when the lining material enters the pressure vessel, the lining material is pressed down by fluid pressure, causing the adhesive to move backwards. The result is that very little adhesive is applied.

As a result, the expected amount of adhesive is not deposited, and the lining material often does not adhere sufficiently to the conduit.

The above application also discloses a method in which the lining material is stored in a pressure vessel and an adhesive is applied while it is being pulled out from there. Since the progress status cannot be recognized from the outside and the reversal speed cannot be controlled, the amount of adhesive applied often becomes uneven.

In addition, in these inventions, while the amount of encapsulated adhesive is large, a relatively large amount of adhesive is applied, but when the adhesive is consumed and decreases, the amount of adhesive applied to the lining material is reduced. The amount also decreases, and the amount of application cannot be controlled.

The present invention solves these problems by advancing the lining material through a pressure vessel divided into two chambers by a partition wall, and by advancing the lining material inside the adhesive application chamber at the rear of the pressure vessel. Adhesive is sealed in the pressure vessel, the adhesive is applied to the inner surface of the lining material, and the lining material is then passed through a slit provided in the pressure vessel to adjust the amount of adhesive applied. ,
The device enters a pressurized inversion chamber at the front of the pressure vessel,
The amount of adhesive applied is adjusted by controlling the pressure in the adhesive application chamber and the pressurized inversion chamber.

To explain the drawings below, FIG. 1 shows an embodiment of the present invention, in which 1 is a pressure vessel which can be separated into a pressure reversing section 2 and an adhesive application section 3. ing.

The pressure reversing unit 2 has a cylindrical body 4, and a base 5 is fixed to the front end of the body 4, and the base 5 is capable of fixing a lining material L in an annular shape.

Further, the front part of the cap 5 is connected to the pipe P through the flanges 6 and 6'.
is fixed.

The rear part of the body 4 is open, and there is a female thread 7 on the inner periphery of the rear end.
An annular protrusion 8 is formed slightly forward of the annular protrusion 8, which protrudes inward.

The adhesive application section 3 has a cylindrical body 9 having a smaller diameter than the pressure reversing section 2, the front end of which is open, and an annular protrusion 10 that protrudes outward is formed on its outer periphery. .

Further, an introduction slit 11 is bored at the rear end of the body 9, through which the flat-folded lining material L can pass.

Reference numeral 12 denotes a slit plate which is sandwiched between the annular protrusions 8 and 10 via packings 13 and 14. By screwing a tightening ring 15 onto the female screw 7, the lining material can be removed. Delivery section 2 and adhesive application section 30
It is designed to be squeezed in between.

As shown in FIG. 2, the slit plate 12 has a slit 16 formed in its center, and a shelf plate 17 is fixed to the lower part of the slit 16.

Further, a valve plate 19 having a notch 18 is swingably supported on the front surface of the slit plate 12, and when the valve plate 19 swings downward, it comes into contact with the packing 20 and the slit 16 is opened. It is designed to reduce the length.

When the pressure vessel 1 is assembled, two chambers, an adhesive application chamber A and a pressure reversal chamber B, are formed separated by the slit plate 12.

21 and 22 are pressure fluid introduction ports, which are connected to a compressor 28 via pressure regulating valves 23, 24 and on-off valves 25, 26, 27, respectively.

Reference numeral 29 denotes a reversing speed adjusting device for the lining plate, which is composed of two rollers 30 and 31, which spans the lining material L in an S-shape, and is actively driven by a motor 32 to adjust the advancing speed of the lining material to a predetermined value. The speed can be adjusted.

33 is a reel on which the lining material L is wound.

A string-like material 34 having a length equal to or longer than the length of the lining material L is connected to the free end of the lining material L, and the string-like material 34 is first wound around the reel 33. Further, the lining material L is wound on top of the lining material L.

As the string-like object 34, a flexible long object such as a string, rope, wire tape, belt, etc. is used.

Next, to explain the method of the present invention, first, the lining material L folded flat is pulled out from the reel 33, passed through the reversal speed adjustment device 29, and is inserted into the adhesive application chamber A of the pressure vessel 1 from its tip. The adhesive is introduced into the adhesive application chamber A through the introduction slit 11 at the rear end.

Next, a predetermined amount of adhesive is injected into this lining material L.

The amount of adhesive is appropriately determined depending on the amount to be applied to the lining material L per unit length and the length of the lining material L.

Next, the tip of the lining material L is folded flat again, and the tip is further passed through the slit 16 of the slit plate 12 and introduced into the pressurized inversion chamber B. The tip is fixed to the cap 5 in an annular shape, and the cap 5 is connected to the tube. Fix it to road P.

Further, the tightening ring 15 is screwed onto the female thread 7 of the pressure reversing section 2, so that the pressure reversing section 2, the slit plate 12, and the adhesive application section 3 are integrally connected.

Next, pressure fluid is introduced from the pressure fluid introduction ports 21 and 22, and the motor 32 is driven to control the reversing speed adjusting device 29.
is activated to send the lining material L forward.

This pressurizes the inside of the folded portion T formed on the annular fixed portion of the lining material L, and the folded portion T advances within the pipe P as the subsequent lining material L is sequentially turned inside out.

The lining material L is then sequentially rewound from the reel 33,
It enters the pressure vessel through the introduction slit 11, adhesive is applied to the inner surface in the adhesive application chamber A, the amount of adhesive is adjusted after passing through the slit 16, and the tube passes through the pressure reversing chamber B. It passes through the pipe P, reaches the folded part T, where it is turned over and bonded to the inner surface of the pipe P with an adhesive.

When the lining material L is drawn into the pressure vessel 1 over its entire length, the string-like material 34 is subsequently drawn into the pressure vessel.

At this time, the excess adhesive injected into the lining material L is squeezed out by the slit 16 and discharged into the adhesive application chamber A from the free end.

Further, when the free end of the lining material L finishes passing through the slit 16, the valve plate 19 swings, and the string-like body 34 fits into the notch 18, thereby reducing the length of the slit 16.

Further, the reversal of the lining material L progresses, and finally, the lining material L is stretched over the entire length of the pipe P, and the string-like body is inserted into it.

In the present invention, since the adhesive application chamber A is pressurized, even if the lining material is pressed down by the fluid pressure of the pressurized reversing chamber B, the adhesive adhered inside is squeezed and the slit 16 Pressurized inversion chamber B with a sufficient amount of adhesive adhered to the inner surface of lining material L.
This allows the lining material L to firmly adhere to the pipe P.

Further, by adjusting the pressure difference between the fluid pressure in the pressure inversion chamber B and the fluid pressure in the adhesive application chamber A, the amount of adhesive applied can be controlled.

That is, if the fluid pressure in the adhesive application section A is greater than the fluid pressure in the pressurized inversion chamber B, the amount of adhesive applied to the inner surface of the lining material L increases, and conversely, the amount of adhesive applied to the inner surface of the lining material L increases. If the fluid pressure in the application section A is relatively small, the amount of adhesive applied will be reduced.

Furthermore, in the conventional method, there was a problem that the amount of adhesive applied gradually decreased as the adhesive sealed in the lining material L was consumed, but in the present invention,
This problem can be solved by gradually increasing the fluid pressure in the adhesive application chamber A relative to the fluid pressure in the pressurized inversion chamber B.

In addition, in the present invention, it is possible to increase the fluid pressure in either the adhesive application chamber A or the pressurized reversing chamber B, or to make the fluid pressures in both the same, but in general, the lining of the pipe line In this case, it is desirable to use a considerably large amount of adhesive to achieve strong adhesion, so it is preferable that the fluid pressure in the adhesive application chamber A be higher than that in the pressurized inversion chamber B.

At the lining material introduction slit 11, it is possible that the adhesive may flow backward from the slit 11 due to the fluid pressure in the adhesive application chamber A, but since the lining material L is moving forward, the viscous adhesive is There is little possibility that the drug will flow backwards, and almost no reverse flow was observed in the experimental results.

In fact, according to the experimental results, in the conventional method, the air present in the rear lining material L accumulates at the rear of the slit and mixes with the adhesive, often impeding the uniform application of the adhesive. However, in the present invention, the air is prevented from entering the adhesive application chamber A, is accumulated at the rear of the lining material introduction slit 11, and is sealed in the lining material L together with the adhesive. Since air also flows backwards and is discharged from the lining material introduction slit 11 due to the fluid pressure in the adhesive application chamber A, the adhesive was applied extremely uniformly.

By the way, in the previous embodiment, a shelf 17 is provided at the rear of the slit 16, and the lining material L filled with adhesive slides on this shelf 17. This is preferable because the lining material L does not sag and therefore the adhesive is not excessively squeezed by the slit 16 and the adhesive is not sufficiently applied within the lining material L.

Further, air does not remain in the adhesive at the slit 16 portion.

In this example, if the frictional resistance between the shelf board 17 and the lining material L is large, the shelf 17 may be constructed of a large number of rollers 35 arranged in parallel, as shown in FIG.

Further, as shown in FIG. 4, by raising the position of the lining material introduction slit 11, it is possible to prevent the lining material from sagging without using a shelf.

In this case, the air that has entered the lining material L in the adhesive application section 3 stays in the upper part of the lining material, and the uneven adhesion of the adhesive is further reduced.

Further, in the previous embodiment, the advancing speed of the lining material L is controlled by the string-like body 34 and the reversing speed adjusting device 29.

Although this is not necessarily necessary, by controlling this, the amount of adhesive applied can be made uniform, and the lining material L can be properly adhered to the inner surface of the pipe P. This provides many advantages, such as preventing problems from occurring and making it easy to resolve problems should they occur.

Further, in the previous embodiment, the base 5 and the pipe P are directly connected, but there is no problem even if they are separated.

That is, by guiding the lining material extruded from the mouthpiece 5 and guiding its inverted portion T to the opening of the conduit, lining can be completed in the same manner thereafter.

The lining material introduction slit 11 and the slit 16 may be simple slits as in the previous embodiment, but if the fluid pressure in the adhesive application chamber A is high and fluid leakage is severe, a labyrinth seal or the like may be used. You can also do it.

Alternatively, a double roller may be rotatably provided at the rear of the slit 16 to adjust the amount of adhesive applied, so that the slit 16 only performs a sealing action against the pressure fluid.

Furthermore, the valve plate 19 can also be provided on the front surface of the lining material introduction slit 11.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a device showing an embodiment of the present invention,
FIG. 2 is a perspective view of the slit plate in this embodiment. 3 and 4 are longitudinal sectional views of an adhesive application section showing a modification of the embodiment. 1... one pressure vessel, 2... pressure reversing section,
3... Adhesive application part, 5... Cap, 1
1... Lining material introduction slit, 12...
・Slit plate, 16...Slit, 1T...
... Shelf board, 29 ... Reversing speed adjustment device, 34
...String-like object, A...Adhesive application room, B
...pressurized inversion chamber, L...lining material, P
・・・・・・Pipeline.

Claims (1)

[Scope of Claims] 1. A flexible cylindrical lining material folded into a flat state is passed through a pressure vessel, its tip is fixed to the tip of the pressure vessel in an annular shape, and pressurized fluid is introduced into the pressure vessel. Then, fluid pressure is applied to the folded part formed on the annular fixed part of the lining material, and the lining material is reversed over its entire length while the reversed part is advanced through the pipe, whereby the inner surface of the pipe is In the method of crimping the lining material, the inside of the pressure vessel is divided by a partition into a pressure reversing chamber and an adhesive application chamber, and an adhesive is injected into the lining material passing through the adhesive application chamber. The adhesive is applied to the inner surface of the lining material that enters the adhesive application chamber from the rear of the pressure vessel, and then the lining material is passed through a squeezing device provided on the partition wall to apply the adhesive. 1. A method for lining a conduit, the method comprising: advancing the lining material into a pressurized inversion chamber while adjusting the amount applied; and simultaneously inverting the lining material and bonding the lining material to the inner surface of the conduit via an adhesive. 2. The method for lining a pipe line according to claim 1, characterized in that the fluid pressure in the adhesive application chamber of the pressure vessel is made higher than that in the pressurized inversion chamber. 3. The method of lining a pipe according to claim 1, wherein the fluid pressure in the adhesive application chamber is gradually increased with respect to the fluid pressure in the pressurized inversion chamber in the first half of the lining process. 4. The method for lining a pipe line according to claim 1, wherein the throttle device is a slit provided in a partition wall. 5. The method for lining a pipe line according to claim 1, wherein the expansion device is a two-ply roller rotatably attached to the rear part of a slit provided in the partition wall. 6. The method for lining a pipe line according to claim 1, wherein the restricting device is a lapirin seal. 7. The pipe lining method according to claim 1, characterized in that a shelf is provided at the rear of the squeezing device, and the shelf holds the lining material passing through the adhesive application chamber so that it does not droop. 8. Claim 1, characterized in that the lining material passing through the adhesive application chamber is held so as not to droop by allowing the lining material to enter the adhesive application chamber from a position higher than the squeezing device. The method of lining the pipeline described. 9. Connect a string-like object with a length equal to or longer than the length of the lining material to the free end of the lining material, and use a reversing speed adjustment device provided behind the annular fixed part to control the speed during the first half of the lining process. 2. The method for lining a pipe according to claim 1, wherein the reversal speed of the lining material is adjusted by adjusting the advancing speed of the string-like material in the latter half of the period.