JPH0390758A - Method and device for water stopping in existing pipeline - Google Patents

Abstract

PURPOSE:To reduce the repairing cost by providing a cylindrical bag-shaped expandable stretching body capable of being inflated radially with compressed air, by transferring the same to a spot to be repaired in a pipeline after installing a repairing material impregnated with adhesive agent to the external face thereof, and by bonding the repairing material to the internal face of the pipe with the expandable stretching body inflated radially. CONSTITUTION:An expandable stretching body 7 made from rubber bags or the like is installed round the external face of a carrier 5 that is capable of moving in a pipeline 1. A repairing material 4 made of nonwoven fabric impregnated with epoxy adhesive agent or the like is prepared and is installed to the external face of the expandable stretching body 7. The carrier 5 is then transferred to a faulty spot A with a transfer means 16 composed of a winch and a rope. The expandable stretching body 7 is then radially inflated with compressed air forcibly fed therein through s hose 23, and the repairing material 4 is pressed and stuck therewith to the internal face of the pipeline 1. After the adhesive agent is half-hardened, the expendable stretching body 7 is radially deflated, making the body separate from the repairing material 4, and the carrier 5 is withdrawn afterward. Thereby materials, equipment and man power can be reduced altogether and, at the same time, term of works can be reduced too.

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a water stop method and device for preventing water from entering or leaking from the outside in existing pipes, and in particular, relates to a water stop method and device for preventing water from entering or leaking from the outside in existing pipes. Targets repairs to localized defective areas.

(B) Conventional technology For example, existing pipes for sewage or sewage buried underground may develop cracks in the pipe material due to the scouring action of groundwater near the pipe or subsidence of the ground. The connecting portion of the tube may bend and become misaligned. Conventional methods for repairing these defective areas while still buried include the backer method, which injects cement (water-stopping material) onto the outside surface of the pipeline, and the tube lining method, which covers the inner surface of the pipeline with a water-stopping membrane. Known (documents unknown).

In the packer method, the pipeline is blocked by placing the defective part in between.
Water is stopped by injecting pressurized cement liquid into the ground through the defective area. In addition, in the tube lining method, a water-stopping material is applied to the inner surface of the tube-shaped base material, and the base material is turned over using compressed air to invert the inner and outer surfaces, thereby sealing the entire surface of the pipe with the base material. Cover with wood to stop water.

<C> Problems to be solved by the invention Conventional water stoppage construction methods such as those mentioned above require a lot of equipment for construction, as well as material costs and a large number of workers, resulting in high construction costs overall. There was a problem. In addition, it takes a long time not only for construction but also for curing the water stop material and washing out excess water stop material after the completion of the work, which has the disadvantage of prolonging the start of service of the pipeline.

The present invention is intended to solve the above-mentioned problems, and aims to make it possible to more easily shut off water at defective locations at low cost and in a short time.

(2) Means for Solving the Problems In this invention, a sheet-like repair material 4 is sent to a defective location by a carrier 5 that moves within a pipe line 1, and there, the repair material 4 is
The pipe is expanded to an expanded diameter and crimped onto the inner surface of the pipe line 1 to stop water at the defective location A.

Specifically, a cylindrical extension body 7 whose diameter changes in size is provided in a circular manner on the outer surface of a carrier 5 that is movable within the pipe.
A sheet-like base material 4a and a water stop material 4b applied to its outer surface
A repair material 4 consisting of
The repair material 4 is wrapped around the outer surface of the base material 4a with the side edges of the base material 4a overlapping each other and the water stop material 4b exposed on the outer surface, and the carrier 5 is sent to the defective location A using the moving means 6, and the repair material 4 is attached to the defective location A. The repair material 4 is fixed to the inner surface of the conduit 1 under pressure by changing the diameter of the spreading body 7 to a larger diameter operating state.

Further, the water stop device applied to the water stop method described above includes a carrier 5 that moves within the pipe line 1 and transfers the repair material 4 to the defective location A, a moving means 6 that moves and operates the carrier 5, and a carrier 5.
The extended body 7 is arranged in a circumferential manner on the outer surface of and whose diameter changes from size to size.
and a spreading drive means 8 for changing the diameter of the spreading body 7 between a small diameter standby state and a large diameter operating state, and a sheet-like base material 4a and a water stop material applied to its outer surface. 4b
A repair material 4 consisting of
The base material 4a is wound around the outer surface of the base material 4a with the side edges thereof overlapping each other and the water stop material 4b is exposed on the outer surface, and the diameter of the spreading member 7 is changed to a larger diameter by the spreading drive means 8 at the defective location A. , so that the repair material 4 can be fixed to the inner surface of the conduit 1 under pressure.

Preferably, the carrier 5 has a cylindrical circumferential wall 10a,
A rubber expansible body 7 is attached to the outer surface of the circumferential wall 10a in a circumferential manner to form a sealed cavity 21 between the expansible body 7 and the circumferential wall 10a, which is generated by the extensible driving means 8. Empty the pressurized fluid! 21 to change the diameter of the expanding body 7 to a larger diameter operating state. In addition, when using a thermosetting plastic material as the water stop material 4b, the vacant room 2
It is preferable to heat the pressurized fluid supplied to the water stop material 4b to a temperature that promotes hardening of the water stop material 4b.

(E) Function In this invention, the sheet-like repair material 4 is wrapped around and attached to the spread body 7 provided on the outer surface of the carrier 5, and the diameter of the spread body 7 is expanded at the defective location A. 4
can be fixed to the inner surface of the conduit 1 by pressure.

In other words, the defective location A can be repaired by using the minimum amount of repair material 4 only in the necessary locations. Further, a moving means 6 for sending the carrier 5 to the defective location A,
Expansion drive means 8 for driving and operating the expansion body 7, etc.
Water stoppage work can be performed with only a small number of devices, and the number of personnel required to operate these devices can be significantly reduced. Roughly,
The work can be completed by simply waiting for the water stop material 4b bonded to the defective location A to harden.

(f) Example 1 to 6 show embodiments of the invention.

In FIG. 6, reference numeral 1 indicates a conduit buried underground, for example, for sewage, and 2 indicates a manhole. The conduit 1 is constructed by sequentially connecting fume pipes 3 of a certain length, and both ends are opened by disconnecting the manholes 2.2 that sandwich a defective point A such as water leakage between them. The defective state of defective point A and its location are determined in advance by an inspection device using a video camera.

The water stop device moves within the pipe 1 and places the repair material 4 at the defective location A.
a carrier 5 for transporting the carrier 5, a moving means 6 for moving the carrier 5, a spreading body 7 for pressing the repair material 4 into contact with the inner surface of the conduit 1 at the defective location A, a spreading drive means 8 for driving and operating the spreading body 7, etc. Consists of.

In FIGS. 1 and 2, the carrier 5 includes a cylindrical frame 10 and front wheels 11 provided on the outer surface of the frame 10 with openings at both ends.
and a rear wheel 12, and the frame 10 is supported concentrically with the conduit 1 by both the front and rear wheels 11, 12 and configured to be movable. The front wheels 11 have three wheels arranged at equal intervals in the circumferential direction.
The caster 13 is made up of rotary casters 13 and leg plates 14 that support each caster 13. The only difference between the rear wheels 12 is that the casters 13 are of a normal type without a turning mechanism.
The structure is similar to that of the front wheel 11. The leg plate 14 is formed of a leaf spring, and presses and biases the caster 13 against the pipe wall within the pipe line 1. In other words, in the free state, three casters 1
The diameter of the virtual circle connecting the tips of the tubes 3 is made larger than the inner diameter of the hume tube 3.

In FIG. 6, the moving means 6 consists of two winches 15.15 installed on the ground facing each manhole 2.2. As shown in the figure, frame 1
The carrier 5 is connected to a traction shaft 17 fixed to both ends of the carrier 5, and the carrier 5 is operated forward or backward by winding up and driving one of the winches 15. A guide pulley 1B is provided within the manhole 2 to guide the wire loaf 16 toward the ground.

As shown in FIG. 4, the repair material 4 is a sheet-like base material 4a.
and a water stop material 4b applied to the outer surface of the base material 4a, and are joined along the inner surface of the tube wall of a certain width including the defective area A to stop water.

In other words, the inner surface of the pipe wall is lined to stop water. Base material 4a
As the material, a non-woven fabric for civil engineering with excellent alkali resistance and having a thickness of around 2# is used, which is made of polypropylene or polyester fiber. Further, as the water stop material 4b, an epoxy adhesive having excellent adhesiveness on wet surfaces and having thermosetting properties is used.

The base material 4a is cut into a rectangular sheet shape with a width of around 40 to 50 cm and a long side length slightly longer than the inner diameter of the pipe line 1, depending on the defect status of the defective point A and the diameter of the pipe line. . A water stop material 4b is applied to this base material 4a, and the water stop material 4b is applied to the base material 4a.
The repair material 4 is formed in such a way that it is sufficiently impregnated into the water and a single layer of the water stop material 4b is formed on the coated surface side.

In FIG. 1, a spreading member 7 is attached to cover the circumferential wall 10a of the frame 10 near the center thereof. The expansion body 7 is made of a rubber molded product, and includes a cylindrical pressing wall 7a, and side end walls 7b that are folded and stored continuously at both ends of the opening of the pressing wall 7a.
A cylindrical seal wall 7C that tightly fits around the circumferential wall 10a is formed in series.

By tightening and fixing the outer surfaces of the seal walls 7C at both ends with bands 20, a sealed cavity 21 is formed between the spreading body 7 and the circumferential wall 10a. The expandable body 7 can be deformed into a standby state with a small diameter shown in FIG. 1 and an operating state with a large diameter shown in FIG. 5. In the standby state, the pressing wall 7
The outer diameter of a is made to be sufficiently smaller than the inner diameter of the pipe line 1.

The expansion drive means 8 consists of a compressor unit 22 installed on the ground, and by supplying compressed air (pressurized fluid) to the cavity 21 via a hose 23 and a joint 24,
The expandable body 7 is expanded and deformed.

25 is a hose reel.

The detailed procedure for repair work will be explained below.

Prior to the work, the wire loaf 16 of each winch 15,
Each of the hoses 23 of the compressor unit 22 is connected to the carrier 5. Next, the repair material 4 is wrapped and attached to the outer surface of the spreadable body 7 which is in a standby state, but as shown in FIG. Attach with 4b exposed to the outside. If necessary, before wrapping the repair material 4, easily water-soluble paper that prevents the adhesion of the water stop material 4b may be wrapped around the spreading body 7. Further, if the defective location A is a non-circular local defect such as clutter, the base material 4a is wrapped so that the overlapping position of the base material 4a does not coincide with the defective location. The repair material 4 can self-maintain its wrapped position due to the adhesive force of the water stop material 4b, and will not fall off from the spreading body 7 due to vibrations caused by the movement of the carrier 5.

As described above, the carrier 5 with the repair material 4 attached thereto is loaded into the conduit 1 from the front wheel 11 side, and the forward winch] 5 is activated to send the carrier 5 to the defective location. At this time,
The winch 15 on the retreating side allows the wire row 116 to be freely paid out. Similarly, the hose 23 can be freely drawn out, but if the moving distance of the carrier 5 is long, the hose 23 can be drawn out with a slight push.

When moving the inspection device forward and backward using the winch 15, mark the wire row 116 corresponding to the defective point A so that the carrier 5 can be moved correctly to the defective point A.
You can move forward up to. In addition, if the distance from the starting position to the defective point A is known at the time of exploration, by measuring the distance of the wire rope 16 to be wound, the carrier 5 is advanced to the defective point A and the repair material 4 is moved to the defective point. A can be confronted correctly.

In the above state, compressed air is supplied to the empty space 21 through the hose 23.
, the side end wall 7b of the spreadable body 7 extends in the radial direction,
The pressing wall 7a is deformed to expand in diameter. At the same time, the repair material 4 is also
The diameter expands so that the overlapping width of the end edges of a decreases, and finally the pressing wall 7a presses the base material 4a against the pipe wall, and the water stop material 4b
make the layers stick together. This state is maintained for about 5 to 10 minutes to semi-harden the water stop material 4b.

After that, when the supply of compressed air to the empty chamber 21 is stopped, the expansion body 7 returns to the standby state by its own elasticity, and the pressing wall 7
a is separated from the base material 4a and separated from the repair material 4. In this state, the winch 15 on the reverse side is operated to wind up the carrier 5, and the carrier 5 is recovered to the man ball 2 on the starting side, and the water stoppage work is completed. In addition, if there are a plurality of defective points A in the pipe line 1 between both manholes 2, the repair material 4 is wrapped around the spread body 7 again and installed, and the water is stopped as described above. In this way, with the water shutoff method of the present invention, even if there are multiple defective points A in the section pipe to be worked on, it can be repaired at the same time by repeatedly performing water shutoff work, without the need for setup changes, etc. It is advantageous in that the work can be completed in a short time.

(g) Modification example FIGS. 7 to 9 each show modified examples.

In FIG. 7, the compressor unit 22 and the empty chamber 21
The heater 2 is installed in the middle of the compressed air supply hose 23 that connects the
7 is provided, and compressed air heated by this heater 27 is supplied to the cavity 21 to promote hardening of the water stop material 4b. A small diameter air outlet 28 for discharging heated air is provided in a part of the circumferential wall 10a that partitions the empty chamber 21.

When the water stop material 4b is heated in this way, the water stop material 4b can be completely cured in about one third of the time required for natural hardening.

FIG. 8 shows a modification of the extension body 7, in which a rubber tube 29 is formed in a spiral groove 3 on the circumferential surface of the frame 10.
0 to form a stretched body 7. In the standby state, the tube wall is recessed into a crescent shape, and the repair material 4 is wrapped and attached to the outer surface of the tube wall. In this example, tube 29
By connecting a supply path and a recovery path to both ends of the water stop material 4b, hot water can be supplied in a circular manner to promote curing of the water stop material 4b.

FIG. 9 shows another modification of the spreading body 7. This is achieved by providing the pressing wall 7a of the expansion body 7 described in the above embodiment with expansion molds 7d that bend in a pleated manner at regular intervals in the circumferential direction, thereby facilitating the diameter expansion deformation of the pressing wall 7a during the operating state. It is something. With this, even if the difference in diameter between the operating state and the standby state is large, the pressing wall 7a can be reliably pressed against the conduit 1.

In the above embodiment, the case where the inspection of the defective point A and the water shutoff work are performed separately was explained, but if the carrier 5 is equipped with a video camera for flaw detection, the flaw detection work and the water shutoff work can be performed at the same time. You can also do it.

Furthermore, when a self-propelled moving means 6, such as motor-driven wheels or a hydraulically-driven crawler device, is added to the carrier 5, the winch 15 on the ground can be omitted.

In addition to using a rubber membrane, the spreading body 7 can also be formed of a plurality of curved plates that overlap in the circumferential direction while in a standby state. In this case, each curved plate is moved by a spreading driving means 8 such as a hydraulic cylinder or an air cylinder. The repair material 4 is pressed and fixed to the pipe wall by protruding outward in the radial direction.

(H) As described in detail of the invention, in this invention, the repair material 4 coated with the water stop material 4b is sent to the defective area A by the carrier 5, and the diameter of the spread body 7 is expanded. Since it is pressed against the inner surface of the pipe line 1 to stop water, it is possible to carry out repairs by using the minimum amount of repair material 4 only in the necessary areas, significantly reducing the material cost required for repairs. Can be reduced. Also,
It is possible to reduce the number of work support devices such as the moving means 6 and the expansion drive means 8 required for water stoppage work, and at the same time reduce the number of workers required to operate the equipment, so that the construction cost of water stoppage work can be significantly reduced as a whole.

In addition, the feeding and recovery of the carrier 5, and the defective location A
Since water can be stopped simply by pasting the repair material 4 in , the work can be easily performed by omitting preliminary and subsequent auxiliary work compared to conventional water stopping construction methods.

Furthermore, since the repair material 4 is only pasted in the necessary areas, the time required for pasting the repair material 4 as well as the time required for curing of the water stop material 4b can be shortened, and the overall time required to cure the water stop material 4b can be shortened. Conduit 1 by shortening the time to completion
can be put into service promptly.

[Brief explanation of drawings]

1 to 6 show embodiments of the present invention, FIG. 1 is a longitudinal sectional view of the main part of the water stop device, and FIG.
3 is a sectional view taken along the line ■-■ in FIG. FIG. 2 is an explanatory diagram conceptually showing the entire structure of the water stop device. 7 to 9 show modified examples, respectively, with FIG. 7 being a longitudinal sectional view of the main part of the carrier, FIG. 8 being a longitudinal sectional front view of the spreading body, and FIG. 9 being a longitudinal sectional side view of the spreading body.

Claims (6)

[Claims] (1) On the outer surface of the carrier 5 which is movable within the conduit 1, a spreading body 7 whose diameter changes in size is provided in a circular manner, and the sheet-shaped repair material 4 is transferred to the spreading body 7 with a small diameter in a standby state. 7
The carrier 5 is sent to the defective area A using the moving means 6 to make the repair material 4 face the defective area A, and the expanded body 7 is expanded to a large diameter operating state to remove the repair material 4. A water stop construction method for an existing pipeline, characterized by fixing the water to the inner surface of the pipeline 1 by pressure. (2) The repair material 4 is composed of a sheet-like base material 4a and a waterproof material 4b applied to the outer surface of the base material 4a. 2. The method for stopping water in an existing pipe according to claim 1, wherein the water stopping material 4b is wrapped around the material so that the side ends overlap each other and the water stopping material 4b is exposed to the outside. (3) A carrier 5 that moves within the conduit 1 to transfer the repair material 4 to the defective location A, a moving means 6 that moves and operates the carrier 5, and a carrier 5 that is arranged in a circumferential manner on the outer surface of the carrier 5 and has a diameter of large and small diameters. It is equipped with a spreading body 7 that changes, and a spreading drive means 8 that changes the diameter of the spreading body 7 between a small diameter standby state and a large diameter operating state, and the sheet-shaped repair material 4 is moved between a small diameter standby state and a large diameter operating state. Expanded body 7 in state
The repair material 4 is fixed to the inner surface of the pipe 1 by wrapping it around the outer surface of the pipe 1, changing the diameter of the spreading member 7 to a larger diameter at the defective point A using the spreading drive means 8, and fixing the repair material 4 to the inner surface of the pipe 1. Device. (4) The repair material 4 consists of a sheet-like base material 4a and a waterproof material 4b applied to the outer surface of the base material 4a, and the repair material 4 is applied to the outer surface of the small-diameter spread body 7 in a standby state. 4. The water stop device for an existing pipe according to claim 3, wherein the water stop device is wound around the water stop material 4b so that the side ends overlap each other and the water stop material 4b is exposed to the outside. (5) The carrier 5 has a cylindrical circumferential wall 10a, and the rubber expansible body 7 is attached to the outer surface of the circumferential wall 10a in a circumferential manner, so that the space between the expansible body 7 and the circumferential wall 10a is sealed. vacant room 2
1 , and a pressurized fluid generated by the expansion drive means 8 is supplied to the cavity 21 to change the diameter of the expansion body 7 to a larger diameter operating state. Water stop device for existing pipelines. (6) Any one of claims 3 to 5, wherein the water stop material 4b is made of a thermosetting plastic material, and the pressurized fluid supplied to the cavity 21 is heated to a temperature that promotes curing of the water stop material 4b. A water stop device for existing pipelines as described in .