JP2631857B2 - Repair method for the inner surface of existing piping - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a method for repairing and reinforcing existing pipes, such as water pipes or sewage pipes, which are mainly buried underground, by lining (coating) a resin from the pipe inner surface while keeping the pipes buried. It is related to surface repair method.

[Prior art]

Conventionally, as a repair method for lining and repairing the inner surface of existing pipes laid underground using a pig, and as a repair method to reinforce, a lining pig moved by a tow rope into the existing pipe A technique is disclosed in which a resin for repair is arranged on the front side of the pig, and the inside of the pig is lined with the resin when the pig passes through the pipeline while pushing the resin by the pig. No. 58-50779. And the amount of resin of the repair resin arranged on the front side of the pig is suitable for the amount of lining beforehand on the pipe inner surface of the repair target section when the pig is inserted into the existing pipe and the repair work is started. The amount is pooled and supplied, and the entire amount of the repair resin is pushed by a pig to line the inner surface of the pipe.

[Problems to be solved by the invention]

In the above conventional pipe inner surface repair method, the repair resin pooled in a lump in front of the pig is pushed by the pig and moves in the pipe, and in the moving process, is sequentially lined on the pipe inner surface, and the amount of resin is reduced. Since it gradually decreases,
Immediately after the start of the repair work and immediately before the end, the working pressure on the resin pig is different, so that a uniform lining condition cannot be obtained over the entire pipe to be repaired. When a resin for use is used, there is a risk that a curing reaction may start while being pooled and pushed by a pig, and there are many restrictions on use, and there are problems to be solved. The present invention has been made to solve the above problems,
An object of the present invention is to provide a method of repairing a pipe inner surface in which the amount of the resin for repair arranged in front of a pig is always substantially constant, and the inner surface of the pipe in the repair section is uniformly lined to reliably perform repair and reinforcement. The purpose is.

[Means for Solving the Problems]

In order to achieve the above object, in the pipe inner surface repairing method of the present invention, in the front side of the pig, a two-liquid curable resin supplied via a tube is mixed by a mixer and supplied as a repairing resin, At the front of the pig, there is provided a pressure sensor for detecting a resin pressure generated by the flow resistance of the repair resin when the pig moves by the tow rope, and the detection value of the pressure sensor is used to detect the resin pressure of the two-liquid curable resin. The supply amount is adjusted so that the amount of the repairing resin is always controlled to be substantially constant. Further, the pig is a resin pool type.

[Action]

According to the above method, first, the amount of the repair resin pooled at the front side of the pig is always substantially constant, and the lining is performed on the inner surface of the pipe in the repair section under substantially the same conditions and the same state, thereby ensuring the repair and Reinforcement is performed, and even a repair resin having a short pot life can be treated before the curing reaction starts.

【Example】

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 denotes an existing pipe (water pipe) to be repaired buried underground, and is long piped by connecting a cast iron pipe of a predetermined size by a pipe joint 2 by a conventional pipe system. The existing pipe 1 and the pipe joint 2 change due to the load of the vehicle passing on the pipe, an earthquake, or soil layer change, corrosion, etc. due to aging, and a gap is formed. From the point of deterioration or cause of water leakage or red water, for the purpose of water leakage repair or preventive maintenance,
The repair resin P described below is lined entirely from the inner surface of the pipe. In this repair work, the existing pipe 1 is first divided into a repair section L having a length suitable for repair, and one of the separated ends 3 is opened to the working pit A above the ground, and the other separated end 4 is similarly opened to the ground. The pig insertion conduit 5 and the pig exit conduit 6 are connected to the separated ends 3 and 4 respectively. Then, a twin hose 7 to be described later is pulled out from the pig insertion conduit 6 through the pipe of the existing pipe 1 from the pig insertion conduit 5, and the tip of the twin hose 7 is wound by a winch 8 mounted on a work cart. A resin pool type pig 10 attached to a terminal portion of a wire 9 provided in the twin hose 7 is towed and moved. The pig 10 has a plurality of guide blades 12 protruding radially from the center in the traveling direction on the outer periphery of a spherical pig body 11. A pressure transducer 13 as a sensor that senses and converts the resin pressure is provided on the resin contact surface at the tip of the pig 10, and the resin pressure converted by the pressure transducer 13 is applied to the outside of the existing pipe 1. A lead wire 14 extending forward along the wire 9 is provided. A static mixer 15 is connected to the twin hose 7 at a predetermined interval from the pig 10 via a wire 9 attached to a front side of the pig 10, and a Y-shaped tube 16 is connected to a tip side of the mixer 15. A high-pressure tube 17 is connected to each of the two divided Y-shaped tubes 16. And the twin hose 7 has these wires 9, lead wires 14,
The high-pressure tubes 17, 17 are integrally formed by being integrally covered with a flexible member, and are taken in the winch 8 as described above. A work pump on which the winch 8 is mounted is provided with a resin pump 18 and a control device 19.
Connected to separate feeds to
19 controls the resin delivery amount of the resin pump 18 according to the resin pressure sensed by the pressure transducer 13, and the resin length 1 of the pool resin P mixed by the static mixer 15 and supplied to the front side of the pig 10 becomes constant. Control. On the other hand, a resin injection machine 20 mounted on a work carriage is arranged near the work pit A, and a predetermined amount of resin is injected from the resin injection machine 20 into the front side of the pig 10 at the time of starting repair work. . When performing a repair work using the pipe inner surface repair apparatus of the existing pipe having such a configuration, first, the twin hose 7 is connected to the existing pipe 1.
The pig 10 is introduced from the pig insertion conduit 5 as shown in the left end portion of FIG. 1, and the two-liquid fast-curing mixed resin is used as the pool resin P from the resin injection machine 20 until the resin length becomes l. Inject and take up the twin hose 7 with the winch 8 and the pig 10
Moves in the existing pipe 1 and, while pushing the pool resin P, lines the resin with the clearance between the outer periphery of the pig body 11 and the inner surface of the pipe, that is, the thickness within the height range of the guide blades 12. Pool resin P consumed by this resin lining
The resin pressure changes, the pressure transducer 13 senses this change, and is supplied to the control device 19 by the lead wire 14 to control the operation of the resin pump 18. The two-liquid curable resin from the resin pump 18 is supplied to the Y-tube 16 through the high-pressure tubes 17 and 17.
To be mixed by the mixer 15 and discharged to the front of the pig 10. Then, when the resin length 1 of the pool resin P reaches a predetermined length and the resin pressure reaches a predetermined pressure, the pressure converter 13 senses this and stops the operation of the resin pump 18 via the control device 19. While such operations are continuously repeated, the repair work on the inner surface of all pipes in the repair section L is completed, the pig 10 is taken out from the pig lead-out conduit 6, and all the work is completed.

【The invention's effect】

As described above, according to the pipe inner surface repair method of the existing pipe of the present invention, the resin pressure of the repair resin disposed on the front side of the lining pig is detected by the pressure sensor provided on the pig, and the detected value is used as the detection value. The amount of the two-liquid curable resin sent to the mixer was controlled so that the repair resin always maintained a substantially constant amount, so that the repair resin was not removed while the pig moved from the beginning to the end of the repair target pipe. Acting on the pig at a substantially predetermined pressure, the resin is lined on the entire inner surface of the pipe under certain conditions, and a reliable repair work is performed. In addition, since the resin is fed into the high-pressure tube in a mixed state with a two-liquid powder and mixed and supplied by the mixer, the residence time at the front side of the pig becomes extremely short, and the lining of the inner surface of the pipe is formed before the curing reaction occurs. As a result, it is possible to use a resin having high curability, thereby shortening the working time and the construction period. Furthermore, since the pig is of a resin pool type, the lining thickness can be made uniform in combination with the resin pressure being substantially constant.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing an embodiment of a repair apparatus for carrying out the method of the present invention, and FIG. 2 is a side sectional view of a main part. 1 ... installation pipe, 2 ... fitting part, 3,4 ... separation end, 5 ...
... pig insertion conduit, 6 ... pig outlet conduit, 7 ... twin hose, 8 ... winch, 9 ... wire, 10 ... pig, 11 ... body, 12 ... guide vane, 13 ... pressure Transducers (sensors), 14 lead wires, 15 static mixers, 16 Y-tubes, 17 high-pressure tubes, 18 resin pumps, 19 control devices, 20 resin injection machines, A, B…
… Working pit, P… pool resin, L… repair section.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Kunio Yamagami 2-5-1, Chuo, Ota-ku, Tokyo Ito Construction Co., Ltd. (72) Motoyuki Koga 1-9-18 Nakamachi, Meguro-ku, Tokyo (56 References: JP-A-60-87881 (JP, A) JP-A-61-191740 (JP, A)

Claims (2)

(57) [Claims] A lining pig moved by a towing line is inserted into an existing pipe buried underground, a repair resin is arranged in front of the pig, and the resin is pushed by the pig. In a pipe inner surface repairing method in which a pig is lined with a resin on an inner surface thereof while passing through a pipe, a two-liquid curable resin supplied through a tube is mixed with a mixer at a front side of the pig. It is supplied as a repair resin, and a pressure sensor is provided in front of the pig to detect a resin pressure generated by the flow resistance of the repair resin when the pig moves by a tow rope. A method for repairing the inner surface of an existing pipe, wherein the amount of the resin for repair is always controlled to be substantially constant by adjusting the supply amount of the two-liquid fast-curing resin. 2. The method according to claim 1, wherein the pig is a resin pool type.