JP2821538B2 - Pig introduction device for pipe inner surface lining repair method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is directed to an existing pipe in which a supply pipe for drawing gas or the like to a demand destination is branched from a conduit laid under a road, such as a gas pipe. In order to regenerate the inside of the supply pipe, a first step of introducing the liquid resin from the end opening of the supply pipe and transferring the whole to the branch position on the conduit side by hydraulic pressure flow from the rear through a pig is introduced. The lining is performed by drawing the resin back to the end of the supply pipe by suction of the vacuum device.
The present invention relates to an apparatus for introducing a pig interposed between a resin and a hydraulic flow when performing a repair method including a process.

[0002]

2. Description of the Related Art Supply pipes as described above are to be repaired.
A repair method for introducing a liquid resin into the supply pipe and lining the inside of the supply pipe has been well known. As a repair method, the present applicant has previously proposed a non-digging type repair method capable of lining the inner wall of a supply pipe without cutting and opening a branch portion of a conduit laid under a road (see, See JP-A-4-114773.

[0003] In this prior art, an opening as a resin injection port is provided at the end of the supply pipe for a supply pipe branched from a conduit, and a required amount of resin introduced into the pipe through the opening is provided. In the first step, the entire amount of the resin is moved in a plug shape and transferred to the branch position on the conduit side, and in the second step, the resin is applied to the inner surface of the pipe while being pulled back to the end side of the supply pipe by suction from the opening. It is basically repairing lining.

[0004] In carrying out the above-mentioned repair method, a method of transferring the resin by using an incompressible hydraulic flow as a means for transferring the resin may be considered. In this case, when the resin is transferred in the first step, there is a problem that water is mixed into the resin due to the pressure of the hydraulic pressure applied to the rear end of the resin. In the second step, the lining is performed while the resin is pulled back. However, there is a problem in that water adheres to the inner wall of the pipe in which the resin advances, and the adhered water droplets generate water bubbles in the lining coating film, so that proper lining cannot be achieved.

As a means for solving this problem, as shown in FIG. 4, when a liquid resin is introduced and transferred into a supply pipe 2 branched from a conduit of a conduit 1 in a first step, a supply pipe is provided. 2 through the tip opening of the meter stand 2a erected at the end of the. Put lining pig 3, and. Thereafter, a required amount of the lining resin A was introduced from the resin injection tank 10, and. A spherical sponge pig 4 for moving the resin so that it does not remain in the tube, behind the injected resin A
, A water-absorbing material 5 having a required water-absorbing capacity, and a spherical silicon pig 6 for water-blocking are sequentially inserted. After their insertion, the tip of the water supply hose 8 extending from the water supply pump 7 is connected to the opening at the tip of the meter standing pipe 2a, water is supplied from the water tank 9 by the operation of the pump 7, and the hydraulic pressure flow is introduced into the pipe. Like that.

[0006] By the above-mentioned water pressure flow, a water supply pressure acts on the lining resin A from the rear through the water-blocking silicon pig 6, the water-absorbing material 5, and the sponge pig 4, and the resin A is moved forward and backward by the water supply pressure. Due to the pressure difference generated in the pipeline, the entire amount of the resin A is transferred to the conduit 1 side in the form of a plug with the lining pig 3 at the head. At this time, a sponge pig 4 for moving all the resin, a water-absorbing material 5 having a required water-absorbing capacity, and a silicon pig for water-blocking are provided between the rear end of the transferred resin plug A and the hydraulic pressure flow. 6 is interposed in series, so that even if water leaks from the peripheral gap of the water-blocking silicon pig 6 and flows forward due to the water supply pressure, the water is absorbed by the water-absorbing material 5 and has a water-blocking function. Is completely reduced to two stages, the mixing of water into the resin plug A is completely avoided, and the entire amount of the resin is transferred toward the conduit 1 by the wiping action of the sponge pig 4 without remaining in the pipe.

[0007] Here, the amount of water supply from the time when the water supply by the pump 8 is started is monitored by a water meter, and when the amount of water supply reaches a predetermined value, the water supply by the pump 8 is stopped. By doing so, the transfer of the resin plug A is stopped in a state where the leading lining pig 3 reaches the branch end on the conduit 1 side.

Subsequently, the process proceeds to a second step. In this step, when the suction operation by the vacuum pump 12 is started as shown in FIG. The water staying in the meter standing pipe 2a is sequentially absorbed, collected into the collecting tank 14 from the connecting pipe 13, and sent to the branch end on the side of the conduit 1 in the first stroke by the suction force. The resin plug A is
Move so that it is pulled back in the opposite direction to the travel. In this process, the lining pig 3 follows the rear side, and in the process of being pulled back, the lining pig 3 forms a coating film of a required thickness on the inner wall of the supply pipe 2 and proceeds to the entire area of the supply pipe 2. Lining is applied.

In the above-mentioned second step, prior to the movement of the resin plug A to be pulled back, the silicon pig 6 wipes off the water on the inner wall of the pipe, and then the water absorbing material 5 further removes the water adhering to the inner wall of the pipe. By absorbing and removing water, water bubbles are not generated in the coating film formed by the subsequent resin plug A, and proper lining is achieved.

[0010]

As described above, according to the lining repair method proposed above, good lining is performed. However, at the time of the above-mentioned work, the sponge pig 4, the water absorbing material 5, and the silicon pig 6 are inserted into the pipe. If these are performed separately, the number of parts increases and the insertion work becomes complicated,
Further, since the sponge pig 4, the water-absorbing material 5, and the silicon pig 6 have the outer diameters substantially corresponding to the inner diameter of the supply pipe 2, when inserting each one so as to push them into the pipe, There are problems that it takes time and that the insertion order is apt to be wrong.

The present invention has been made in view of the above-mentioned problems, and the sponge pig 4, the water-absorbing material 5, and the water-shielding silicon pig 6 interposed between the resin and the hydraulic flow are formed as a single part in a pipe. It is an object to provide a device that can be inserted.

[0012]

In order to achieve this object, the present invention relates to a method for repairing an in-line lining comprising a first step and a second step, wherein a resin plug introduced from a terminal opening of a supply pipe is provided. The sponge pig that moves the resin so that it does not remain in the pipe, a water-absorbing material that has the required water-absorbing capacity, and a silicon pig for water-blocking are inserted and arranged at the rear of the sponge-pig, water-blocking material, and water-blocking material. The silicon pig for use is housed in a cassette case having an inside diameter substantially the same as the inside diameter of the supply pipe to make a single part, and after the resin is inserted,
The cassette case is connected to the terminal opening of the supply pipe, and a water supply hose from a water supply pump is connected to the other end of the cassette case, and the sponge pig, the water absorbing material, and the water-blocking silicon pig are introduced into the pipe in series by hydraulic pressure flow. And is configured to transfer resin.

[0013]

According to the present invention constructed as described above, a plurality of sponge pigs, a water-absorbing material, and a water-shielding silicon pig interposed between a resin and a hydraulic flow are formed as a single part, and are required for repair. Points can be reduced.

Further, when one end of the cassette case is connected to the end opening of the supply pipe, and the water supply hose is connected to the other end of the cassette case to operate the water supply pump, a plurality of sponge pigs housed in the cassette case are obtained. The water-absorbing material and the water-blocking silicon pigs are inserted into the pipes in a sequence in a correct order, so that the insertion order is not erroneous and the insertion operation is performed efficiently.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first step of the pipe inner surface lining repair method to which the present invention is applied, and FIG. 2 shows a subsequent second step. In these FIGS. 1 and 2, 1 is a conduit laid under a road, 2 is a supply pipe branched off from the conduit 1 and drawn into the residential land. A meter stand 2a extending toward the ground is connected. Usually, a gas meter (not shown) of a demand destination is attached to the upper end of the meter standing pipe 2a, but the opening is used as a resin and hydraulic pressure flow inlet by removing the meter at the time of this repair.

In the first step shown in FIG. 1, a lining pig 3 is arranged at the top of the meter stand pipe 2a from the upper end opening thereof, and the resin A for repair is formed into a plug in a liquid state at a subsequent stage. be introduced. This resin A is introduced by, for example, connecting a manual type resin injection tank 15 as an example to the upper end opening of the meter stand 2a, and pushing down the piston 15a to introduce a required amount of the resin A contained in the tank. Here, the amount of resin A is determined by the supply pipe 2 to be repaired.
The required amount calculated from the relevant conditions such as the tube length, the tube inner diameter, and the thickness of the coating film to be formed is introduced.

After the resin A is introduced, the resin injection tank 15 is removed from the upper end opening of the meter stand 2a, and the injected resin A is left in the tube from the upper end opening of the meter stand 2a in the same manner as before. The sponge pig 4, a water-absorbing material 5 having a required amount of water-absorbing ability, and a spherical water-blocking silicon pig 6 are inserted. 5. The water-shielding silicon pig 6 is housed in a cassette case 21 having an inner diameter substantially the same as the inner diameter of the supply pipe 2 to constitute a single-part pig cassette 20.

As shown in FIG. 3, the pig cassette 20 has a cassette case 21 having substantially the same inner diameter as the supply pipe 2 to be repaired, and connection fittings 22 and 23 fixed to both ends thereof. Consists of Connection fittings 22, 23
Each has a handle 24, and the tip of the handle 24 is a cam. When the handle 24 is opened and closed, one of the connection fittings 22 is in the opening of the meter stand 2a, and the other connection fitting 23 is The tip of the water supply hose 8 can be engaged and disengaged with one touch.

The outer diameter of the sponge pig 4, the water absorbing material 5, and the silicon pig 6 housed in the cassette case 21 is preferably larger by 20% to 30% than the inner diameter of the cassette case 21 and the supply pipe 2. Good. According to experiments,
When the outer diameter of the sponge pig 4, the water-absorbing material 5, and the silicon pig 6 is 32 mm with respect to the inner diameter of the general supply pipe 2 of 25 mm, the most effective action of moving all the resin, water absorbing action, and water blocking action. It has been made. Regarding the material and shape, the sponge pig 4 is made of a sponge sphere made of closed-cell urethane rubber or the like, and the water-absorbing material 5 is a columnar member having a required length so that it can pass smoothly even at a bent portion in the pipe. It is formed of a material having flexibility, a required amount of water absorption capacity, and not compressively deformed even when subjected to a water supply pressure from behind, for example, a polymer resin material. Further, the water-proof silicon pig 16 is formed in a sphere made of solid silicon resin.

The sponge pig 4, the water-absorbing material 5, and the silicon pig 6 are connected to the cassette case 21 at both ends so that they do not fall out of the cassette case 21 and foreign substances do not enter the cassette case 21. 22,
It is preferable that the cover 25 is put on the opening of the connecting member 23, and the cover 25 is removed at the time of use to connect the opening of the connection fittings 22, 23 to the other side.

In the state where the pig cassette 20 described above is connected with one connecting fitting 22 to the upper end opening of the meter standing pipe 2a and the other connecting fitting 23 to the tip of the water supply hose 8 extending from the water supply pump 7. When the pump 8 is driven, the water in the water tank 9 is absorbed and sent from the water supply hose 8 into the pig cassette 20, and the water pressure flow is applied to the water-shielding silicon pig 6 housed in the pig cassette 20,
The water pressure acts on the water-absorbing material 5 and the sponge pig 4 to generate a pressure difference in the front and rear pipes. The pressure difference causes the resin plug A to move through the pipe of the supply pipe 2 with the lining pig 3 at the head and the pipe 1 Move to the side. Then, when the leading lining pig 3 reaches the branch position on the conduit 1 side, the water supply is stopped to stop the movement of the resin plug A.

During the movement of the resin plug A described above, a water-blocking silicon pig 6, a water absorbing material 5, and a sponge pig 4 are interposed between the water pressure flow from the rear and the resin plug A. Even if water leaks from the peripheral gap of the water-blocking silicon pig 6 due to pressure and flows forward, the water is absorbed by the water-absorbing material 5 and the water-blocking function becomes two-stage, so that water is mixed into the resin plug A. Is completely avoided.

Following the first step described above, the second step shown in FIG.
In the process, the collection tank 14 is connected to the upper end opening of the meter stand 2a via the connection pipe 13 as described above, and the vacuum pump 12 is connected to the collection tank 14 via the hose 16.
The connection pipe 13 is provided with a water stopper silicon pig 6, a water absorbing material 5, and a pig stopper 17 for receiving the sponge pig 4 between the connection pipe 13 and the recovery tank 14. In the second step, the water retained in the supply pipe 2 and the meter standing pipe 2a sent in the previous first step is successively absorbed and collected in the tank 14 by the suction action by the operation of the vacuum pump 12. In addition, the resin plug A sent to the branch end on the side of the conduit 1 moves so as to be pulled back in reverse to the first step, and in this step, the lining pig 3 follows the tail of the resin plug A. In the pulling-back process, a coating film of a required thickness is formed on the inner surface of the supply pipe 2 and the inner surface of the meter standing pipe 2a. The silicon pig 6 wipes off the water on the inner wall of the pipe and then removes the water adhering to the inner wall of the pipe with the water absorbing material 5 so that the coating film formed by the subsequent resin plug A has Eliminates water bubbles Grayed construction is achieved.

[0024]

According to the present invention, as described above, the first
Since a plurality of sponge pigs, water-absorbing materials, and water-blocking silicon pigs interposed between the resin introduced into the pipe during the process and the hydraulic pressure flow are housed in a cylindrical cassette case and become a single component In addition, the number of parts required for repair can be reduced.

When one end of the cassette case is connected to the end opening of the supply pipe and the water supply hose is connected to the other end of the cassette case to operate the water supply pump, the plurality of sponge pigs housed in the cassette case, The material and the water-impervious silicon pigs are inserted into the pipes in a sequence in an orderly manner, so that there is an effect that the insertion order is not erroneous and that the insertion work is performed efficiently.

[Brief description of the drawings]

FIG. 1 shows a first method of repairing a pipe inner surface lining according to the present invention.
It is explanatory drawing which shows the procedure in a process.

FIG. 2 is a second illustration of the pipe inner surface lining repair method according to the present invention.
It is explanatory drawing which shows the procedure in a process.

FIG. 3 is an enlarged sectional view showing a pig cassette according to the present invention.

FIG. 4 is an explanatory view showing an example of a procedure in a first step of a conventional lining repair method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conduit 2 Supply pipe 2a Meter stand 3 Lining pig 4 Sponge pig 5 Water absorption material 6 Silicon pig for water shielding 8 Water feed pump 9 Water tank 20 Pig cassette 21 Cassette case 22 23 Connection fitting 24 Handle

Continuation of the front page (56) References JP-A-53-26840 (JP, A) JP-A-54-134751 (JP, A) JP-A-56-155679 (JP, A) JP-A-57-59671 (JP) , A) JP-A-59-42071 (JP, A) JP-A-59-90663 (JP, A) JP-A-59-92057 (JP, A) JP-A-49-54351 (JP, U) UK Patent 2114255 (GB, A) UK Patent 2094178 (GB, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B05C 7/06-7/08 B05D 7/22 F16L 55/16 F16L 57/00 F16L 58/10 EPAT (QUESTEL)

Claims (1)

(57) [Claims] In a first step, a required amount of resin required for lining the inside of the supply pipe is plugged into the supply pipe from an end opening of the supply pipe in a first step with the supply pipe branched from the conduit path as a repair target. The entire amount of the resin is transferred to the branch position on the side of the conduit by the hydraulic flow introduced from the rear thereof, and in the second step, the resin plug is applied to the inner surface of the supply pipe while being pulled back to the end side of the supply pipe by suction of the hydraulic flow. In the lining repair method for the inner surface of the pipe to be lined, a sponge pig for moving the resin so as not to remain in the pipe at the rear of the resin plug introduced from the terminal opening of the supply pipe, and a water absorbing material having a required amount of water absorption capacity In order to insert and arrange the water-blocking silicon pig, the sponge pig, the water-absorbing material, and the water-blocking silicon pig are housed in a cassette case having an inner diameter substantially equal to the inner diameter of the supply pipe. After the resin is inserted, the cassette case is connected to the terminal opening of the supply pipe, and a water supply hose from a water supply pump is connected to the other end of the cassette case. A pig introducing apparatus for a pipe inner surface lining repair method, wherein a silicon pig for water is introduced into a pipe in series and a resin is transferred.