JP2963375B2 - Repair method for existing pipeline - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing an existing pipeline, such as a gas pipe, a water pipe, etc., for the purpose of maintenance of the pipeline. Repair method.

[0002]

2. Description of the Related Art Various techniques have been developed for repairing existing pipelines by digging without burying existing pipelines. For example, there are a resin lining method in which a resin lining film is formed on the inner surface of the pipe, and a lining method in which a flexible lining tube is introduced into the pipe by inversion / non-inversion to be in contact with the inner surface of the pipe.

[0003] The lining reversing lining method in the above-mentioned repairing method will be described. As a preparatory stage before construction, first, a belt for guiding traction while inverting the lining tube along the pipeline is inserted into the lining tube. And a step of sealing the inside of the tube with an adhesive for attaching the lining tube to the inner surface of the pipe of the pipe to be repaired. Then, the traction belt is inserted into the pipeline, one end of the lining tube is folded back into one end opening of the pipeline and attached, and a blower or the like is further connected to the opening to apply pressure so that the lining tube is inverted. While pulling the traction belt, the lining tube is inverted and introduced into the pipe to be in contact with the inner surface of the pipe.

[0004] In the case of the above-mentioned reversing lining method, although the lining tube after being attached to the inside of the pipe has advantages such as excellent vibration resistance, there are many preparatory works before the construction, and the construction time is lengthened. There was a point. As a prior art for solving the above problems, for example, Japanese Patent Publication No.
No. 20411 discloses a pipe inner surface lining method. In this method, as shown in FIG. 3, an inserted mass c is introduced into the pipe through one end opening b of the construction pipe a, then the adhesive d flows in, and the inner surface of the lining tube e is turned outward to be inverted. In this state, the tube e is fixed to the opening b, and the tube e is pressed and pushed from the opening b side, and at the same time, the adhesive d and the inserted mass c are advanced to bring the tube e into contact with the inner surface of the tube. Thereby, the preparatory work before the construction such as the step of inserting the belt for traction guidance into the tube and the step of sealing the adhesive in the tube can be omitted, and the construction time can be shortened.

[0005]

In the case of the prior art, since the lining tube is introduced into the tube only by pressurization, there is no problem with the straightness of the tube.
When the tube approaches a bent portion such as an elbow, the tube hits the inner wall surface, and the bent portion of the tube has poor progression. For this reason, there arises a problem that the tube is bent or the progress of the tube is stopped there, so that the liner tube cannot be properly attached to the inner surface of the tube.

Further, when there is a pipe joint such as a socket in the middle of the repair pipe, a step is formed on the inner surface of the pipe. When such a pipe is constructed by the above-mentioned prior art method, the step is inserted into the step. May get stuck. Furthermore, when the penetrating mass approaches the step, a gap is formed between the inner surface of the tube and the penetrating mass, and the adhesive flows out of the gap ahead of the penetrating mass, which causes a problem that a proper lining lining cannot be performed. . Furthermore, if the configuration is such that the insertion mass is towed in order to solve the above-described inconvenience, a pulling wire is inserted into the pipe, or a pulling device for pulling the wire is required, and equipment for construction is required. The problem that becomes large is derived.

Further, in the case of the above-mentioned conventional method, the adhesive d is pushed by the rear lining tube e while the tube is in contact with the inner surface of the tube, so that the adhesive layer between the inner surface of the tube and the lining tube becomes uneven. It tends to be. Therefore, as shown in the enlarged portion of FIG. 3, when the lining tube e is composed of only one plastic layer, the unevenness of the adhesive layer cannot be absorbed. As a result, the inner surface of the lining tube e after the in-tube attachment becomes uneven.

The present invention has been devised in order to solve these problems, and an object of the present invention is to provide a method for repairing an existing pipeline which can be installed efficiently and with high quality in a short time with simple equipment. It is assumed that.

[0009] In order to achieve the above object, the present invention is to provide a flexible lined tube which is introduced into the pipeline from an opening at one end of the existing pipeline buried underground while turning over the inside of the pipeline. In the repairing method of the existing pipeline to be attached, a leading pig having an outer diameter slightly larger than the inner diameter of the pipeline from one end opening of the existing pipeline and formed of sponge material is introduced into the pipeline. The required amount of adhesive to be applied to the inner surface of the pipe is introduced into the pipe so as to be located at the subsequent stage of the leading pig, and is slightly smaller than the inner diameter of the pipeline so as to be located at the latter stage of the adhesive. A leveling pig having an outer diameter is introduced into the pipe, the lining tube is mounted so as to be inverted into one end opening of the pipe, and a suction device and a negative pressure measurement adjusting means are provided at the other end of the pipe. To generate a predetermined negative pressure in the pipeline, and the negative pressure The leading pig, the adhesive, and the leveling pig are moved at a constant speed to the other end of the pipe, and after forming a uniform adhesive lining layer on the pipe inner surface, the lining tube, which is reversed and introduced, is placed on the pipe inner surface. A repair method for existing pipelines, characterized by being attached.

[0010]

[0011]

In the method of repairing an existing pipeline according to the present invention, first, a leading pig made of an elastic sponge or the like having an outer diameter slightly larger than the inner diameter of the existing pipeline at one end opening thereof is formed. Introduce into the pipeline. Next, the necessary amount of adhesive to be applied to the inner surface of the pipe is introduced into the pipe so as to be located at the subsequent stage of the leading pig, and the leveling pig is further leveled so as to be located at the latter stage of the adhesive. Introduce. Thereafter, the inner surface of the lining tube is turned outward at the one end opening of the conduit so as to be adjacent to the leveling pig, and the tube is mounted. Then, a suction device is connected to the other end opening of the conduit to generate a negative pressure in the conduit. Then, the leading pig, the adhesive, and the leveling pig are moved to the other end of the pipeline by the negative pressure, and the lining tube is drawn into the pipeline while being inverted. At this time, an adhesive coating layer having a uniform thickness is formed on the inner surface of the pipe by a leveling pig, and the inner lining tube is reversely attached to the inner surface of the pipe by the negative pressure.

Further, the leading pig, the adhesive, the leveling pig, and the lining tube are guided and moved in the traveling direction by the negative pressure, so that the leading pig, the adhesive, the smoothing pig, and the lining tube move smoothly. Is attached smoothly.

Further, since the leading pig is compressed and introduced into the pipe, when the pig approaches a step in the pipe, the leading pig expands its diameter and moves while maintaining the sealing property.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an existing pipeline repair method of the present invention. In FIG. 1, reference numeral 1 denotes an existing pipeline to be buried underground, and reference numeral 2 denotes a main pipe connected to the existing pipeline 1. In order to repair the existing pipeline 1, the pipeline 1 is once cut from the main pipe 2. As shown in FIG.
The existing pipeline 1 to be constructed includes several bent portions. A reel device 8 around which a flat flexible lining tube 6 is wound is disposed on one end opening 1a side of the pipeline.

As a procedure of the repair method of the present invention, first, a leading pig 3 having an outer diameter slightly larger than the inner diameter of the existing pipeline 1 is introduced into the pipeline 1 from the opening 1a of the existing pipeline 1. Next, a necessary amount of the adhesive 5 applied to the inner surface of the pipe 1 is introduced into the pipe 1 so as to be located at the subsequent stage of the leading pig 3, and the leveling pig is further placed so as to be located at the subsequent stage of the adhesive. 4 is introduced into the tube. Then, one end of the lining tube 6 is folded back outward so as to be adjacent to the leveling pig 4, and is annularly fixed to the conduit opening 1a.

Next, a suction device P is arranged and connected to the other end opening 1b side of the pipeline 1, and a negative pressure is generated in the pipeline by operating the suction device P. Due to the negative pressure, the leading pig 3, the adhesive 5, and the leveling pig 4 move toward the opening 1b side of the pipeline, and the adhesive applied to the inner surface of the pipeline while the lining tube 6 is turned over in the pipeline 1. The agent 5 is attached to the inner surface of the pipe.

At this time, as shown in FIG. 2, an adhesive coating layer having a uniform thickness is formed on the inner surface of the tube by the leveling pig 4.
The liner tube 6 is reliably reversely attached to the inner surface of the pipeline by the negative pressure. As a result, as shown in the enlarged portion of FIG. 2, even if the lining tube 6 is made of only one layer of plastic, the inner surface of the tube 6 after being attached inside the tube becomes smooth.

As shown in FIG. 2, the leading pig 3, the adhesive 5, the leveling pig 4, and the lining tube 6 are guided and moved by the negative pressure in the traveling direction. Even if it hits a bent portion, it passes smoothly, and the tube 6 is attached along the inner surface of the tube while being smoothly inverted.

Further, since the leading pig 3 has an outer diameter slightly larger than the inner diameter of the pipe line 1 and is formed of a sponge material having elasticity, the pig is compressed and introduced into the pipe 1 and shown in FIG. When approaching an unexpanded pipe expanding section, the pipe can be moved while maintaining the sealing performance by expanding the diameter. Thereby, the adhesive 5 is reliably prevented from flowing out ahead of the leading pig 3.

A negative pressure measuring and adjusting means 9 is provided on the side of the suction device P, and the pressure is measured at a pressure equal to or higher than the upper limit of a predetermined range while measuring the pressure (negative pressure) in the pipe on the suction side. If the pressure fluctuates below the lower limit of the predetermined range, the operation of the suction device is adjusted, so that the suction-side pipe pressure (negative pressure) is always maintained in the predetermined range.

As described above, the suction force is kept constant by keeping the suction side pipe pressure (negative pressure) within a predetermined range. Therefore, it is possible to correct the pressure fluctuation in the pipe which may occur when the flexible lined tube 6 is turned over due to a portion such as the pipe diameter expanding portion. With the constant traveling speed obtained with the constant suction force, various inconveniences in the construction caused by the pressure fluctuation in the pipe are eliminated.

[0022]

According to the existing pipe repair method of the present invention, a leading pig having an outer diameter slightly larger than the inner diameter of the existing pipe is introduced into the pipe from one end opening of the existing pipe. A required amount of adhesive to be applied to the inner surface of the road is introduced into the pipe so as to be located at the subsequent stage of the leading pig, and a leveling pig is introduced into the tube so as to be located at the latter stage of the adhesive. The liner tube is mounted to the one end opening of the conduit so as to be inverted, and then a suction device is connected to the other end opening of the conduit to generate a negative pressure in the conduit, and the negative pressure is generated in the conduit. The following effects are obtained by moving the leading pig, the adhesive, and the leveling pig to the other end side of the pipe by pressure and attaching the lining tube, which is reversed and introduced, to the inner surface of the pipe with the adhesive. Become like

[0023] The step of inserting a belt for pulling and guiding the lining tube while inverting the lining tube along the pipeline over the entire length of the lining tube and the pipe to be installed can be omitted. Prior to introducing the lining tube into the tube, the operation of sealing the adhesive in the tube can also be omitted. The leading pig, the adhesive and the lining tube are guided by the suction and move in the direction of travel, so that each of them has good progress, and even if it hits a bend, it passes smoothly, and the lining tube is smoothly inverted and the inner surface of the tube It is attached along. An adhesive coating layer of uniform thickness is formed on the inner surface of the tube,
Even if the lining tube is made of only one layer of plastic, the inner surface of the tube after the inside of the tube is smoothed. As a result, the required lining can be formed without using a two-layer lining tube (composed of a plastic layer and a fabric layer), which requires a high material cost, thereby reducing the repair cost. Therefore, the reversing lining construction for the existing pipeline can be performed efficiently and with high quality in a short time with simple equipment.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method of repairing an existing pipeline in the present invention.

FIG. 2 is an explanatory diagram showing a construction state at a bent portion of a pipeline.

FIG. 3 is an explanatory diagram showing a conventional existing pipe line repair method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Existing piping 1a Opening 1b Opening 2 Main pipe 3 Leading pig 4 Leveling pig 5 Adhesive 6 Lining tube 7 Stepped part 8 Reel 9 Pressure measurement adjusting means P Suction device

Continuation of the front page (56) References JP-A-55-21284 (JP, A) JP-A-60-15127 (JP, A) JP-A-59-115770 (JP, A) JP-A-63-267481 (JP) , A) (58) Fields surveyed (Int. Cl. ⁶ , DB name) B29C 63/00-63/48 B05D 7/22 F16L 1/00 F16L 55/10-55/18 PCI (DIALOG) EPAT (QUESTEL) )

Claims (1)

(57) [Claims] 1. A method of repairing an existing pipeline in which a flexible lining tube is inverted and introduced into the pipeline from one end opening of the existing pipeline buried in the ground to abut on the inner surface of the pipeline. A required amount to introduce a leading pig having an outer diameter slightly larger than the inner diameter of the existing pipe line from the one end opening of the existing pipe line and formed of a sponge material into the pipe line, and then applying it to the inner surface of the pipe line Is introduced into the pipeline so as to be located on the subsequent stage side of the leading pig, and a smoothing pig having an outer diameter slightly smaller than the inner diameter of the pipeline is located in the latter stage of the adhesive. The suction tube and the negative pressure measuring and adjusting means are connected to the other end opening of the conduit, and the suction tube and the negative pressure measurement adjusting unit are connected to the other end opening of the conduit. A predetermined negative pressure is generated in the pipeline, and the leading pig, the adhesive, and the leveling pig are caused by the negative pressure. One to the other end of the line
A method for repairing an existing pipeline, wherein the lining tube, which is moved at a constant speed to form a uniform adhesive lining layer on the inner surface of the tube and then reversely introduced, is attached to the inner surface of the pipeline.