JPH0835596A - Water retention method for water retention buried pipe - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to easily and stably stop water in a water retention buried pipe including a laterally extending low-place pipe where the pipe is full of water. [Structure] The accumulated water in the pipe is replaced with the water blocking material at the defective portion of the low-place pipe section in a full water state, and then the replaced water blocking material is injected and filled into the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water stopping method for a water retention buried pipe.

[0002]

[Prior art and its problems] In existing buried pipes such as power pipes and gas mains buried underground, groundwater inevitably enters from pipe joints, corrosion holes, cracks, etc. A low water level below the groundwater level may cause full water.

When lining is applied to the inner surface of such a water retention buried pipe, for example, by applying various lining construction methods, drainage of accumulated water in the pipe, stopping of water leakage and cleaning inside the pipe are performed as pretreatment steps. Will be required.

The applicant firstly loosely inserted a tube over the entire length of the above-mentioned buried pipe from the work openings formed at both ends of the water-retained buried pipe to be constructed, and stayed inside the pipe between the buried pipe and the tube. The first step of temporarily containing water is to fill the gap between the buried pipe and the tube with a water-stopping material from one end to the other end so that the total amount of the accumulated water in the gap is piped. The second step of discharging the water to the outside and injecting and filling a part of the water blocking material into the pipe joint portion, the corrosion hole, etc. to perform the water blocking treatment. Pretreatment method for water retention buried pipe, including a third step of peeling and collecting the tube from the solidified layer while leaving it, and a fourth step of removing the solidified layer together with deposits such as rust on the inner surface of the buried pipe and cleaning the inside of the tube (See, for example, Japanese Patent Laid-Open No. 3-106479).

According to the above-mentioned construction method, the accumulated water in the pipe can be discharged by using the water-stopping process of the pipe, and the solidified layer of the water-stopping material remaining after the water-stopping process can be removed by using the in-pipe cleaning work. Therefore, the work efficiency can be improved much more than the case where the accumulated water is discharged, the water stoppage treatment and the pipe cleaning are individually performed, but it takes time to insert the pipe into the pipe and recover the peeling from the pipe, and further improvement is desired. Was there.

In order to solve the problem of the first invention, the applicant of the present invention has a wire-passing step of inserting a wire rod over the entire length of the buried pipe from work ports formed at both ends of the water retention buried pipe to be constructed, Subsequent to the wire passing step, a homogel-type water blocking material is injected and filled into the buried pipe from one end to the other, and the accumulated water in the pipe is transferred to the buried pipe through the water blocking material as well as the buried pipe. After the accumulated water is discharged to the outside of the pipe while extruding toward the end, the accumulated water in the pipe is discharged, and then the waterproof material for filling the pipe is pressurized to inject and fill a part of the waterproof material in the pipe. A pretreatment method for a water retention buried pipe, including a water-stopping step and a cleaning step in which the water-stopping material is solidified and then discharged outside the pipe by applying a cleaning means attached to the wire. (See Japanese Patent Application No. 5-68396).

According to this second invention, the problems of the first invention can be solved, but it has been found that further improvement is required in the following points.

(A) When the amount of water staying is large, the water-stopping material is diluted with the accumulated water, so that a sufficient water-stopping effect may not be obtained.

(B) As shown in the embodiment of the second aspect of the invention, if the pig for moving in the pipe is used for draining water from the inside of the pipe, the problem of dilution of the water blocking material is eliminated, but both sides of the water retention portion are eliminated. In many cases, there is a bend in the pipe, which may make it difficult to move the pig in the pipe.

The present invention has been made for the purpose of eliminating the problems of the second invention.

[0011]

DISCLOSURE OF THE INVENTION The present invention is a water stop construction method for a water retention buried pipe including a laterally extending low-place pipe portion in which the inside of the pipe is substantially full, and the both ends of the buried pipe are First step of forming a work opening in the buried pipe, and passing the running wire through the work opening along the entire length of the buried pipe, a television camera is installed in the buried pipe, and the camera is installed using the above-mentioned running wire. The second to confirm the position of the defect in the tube by moving inside the tube.
By supplying a homogel-type water-stopping material from the ground into the bottom pipe part near the defect part confirmed in the step and the above-mentioned second step, the accumulated water in the pipe in both sides of the defect part as a center is supplied. And a third step of substantially replacing the water-stopping material with the water-stopping material, and passing the water-stopping material supplied from the injection nozzle to the replacing portion through the defect portion through the defect portion by utilizing the pressure difference between the inside and the outside of the pipe. The present invention relates to a water stoppage construction method for a water retention buried pipe, which comprises injecting and filling into the ground on the outer side.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following will describe one embodiment of the method of the present invention with reference to the accompanying drawings.

FIG. 1 shows a state of water retention in a buried pipe 1 to be constructed. Inside the buried pipe 1, a low-place pipe portion 1a extending laterally by infiltrated water 3 that has infiltrated from a defect portion 2 and the pipe portion 1a. The rising pipe portions 1b, 1b connected to both ends are filled with water halfway. If the water is not full, add water to fill it. In the figure, a indicates the groundwater level.

FIG. 2 shows the state of the first step of the method of the present invention. In this first step, working ports 4 and 4 are formed at both ends of the water retention buried pipe 1, and the wire 5 is inserted through the working ports 4 and 4 over the entire length of the buried pipe 1.

FIG. 3 shows a second step that follows the first step.
The process status is shown. Buried pipe 1 in the second step
A television camera 6 is installed in the low-place pipe portion 1a, and the position of the defective portion 2 in the pipe is confirmed while moving the camera 6 in the pipe by using the above-mentioned wire rod 5. The above camera 6 while moving in the pipe
When the defective portion 2 is caught, the camera 6 is stopped at that position, and the position of the defective portion 2 is determined based on the drawing length of the camera in the pipe, the image displayed on the monitor TV (not shown) on the ground, and the like. Is calculated and recorded.

4 and 5 show the situation of the third step which is carried out subsequent to the second step. In the third step, first, as shown in FIG. 4, the injection hose 8 having the injection nozzle 7 at the tip is inserted up to the position of the defect portion 2 whose position has been confirmed in the second step. The injection hose 8 is inserted into the pipe by pulling the wire 5. The length of the hose 8 is measured by the length measuring machine 9, so that the injection nozzle 7 and the defective portion 2 can be aligned with each other. .

The injection nozzle 7 is provided with a discharge port 7a which opens in the pipe radial direction of the low-place pipe portion 1a.

After the insertion and installation of the injection nozzle 7 into the low-place pipe portion 1a is completed, the working ports 4 and 4 at both ends of the buried pipe 1 are sealed by the lids 10 and 10 as shown in FIG.

In the state shown in FIG.
Then, it is sent toward the injection nozzle 7 at its tip via the injection hose 8 connected thereto.

The water blocking material supply unit 12 is provided with a main agent pump 12a and a hardening agent pump 12b, and these pumps 12a, 12
By operating b, the main agent and the curing agent are mixed at a predetermined ratio to prepare a water blocking material having a predetermined gel time.

The water-stopping material sent from the supply unit 12 to the injection nozzle 7 through the injection hose 8 is the discharge port 7a of the nozzle 7.
It is discharged in the pipe radial direction at a position in the lower pipe portion 1a which substantially coincides with the defect portion 2. The discharge of the water blocking material in the radial direction of the pipe is for suppressing the movement and diffusion of the discharged water blocking material in the pipe axis direction as much as possible.

When the discharge of the water blocking material from the injection nozzle 7 is continued, the concentration of the water blocking material in the pipe gradually increases around the defective portion 2 and eventually becomes high. In this high concentration region, the discharge time elapses. Along with this, the water spreads in the axial direction of the pipe, and eventually the accumulated water in the pipe in the vicinity of the defect portion 2 is almost replaced with the water blocking material.

FIG. 5 schematically shows the water-stopping material replacing portion 13, in which the water-stopping material has the highest concentration in the region centered on the defective portion 2, and the water-stopping material in the regions on both sides from this is water-stopping in the axial direction of the pipe. The wood concentration is gradually decreased.

On the other hand, as the water-stopping material is supplied into the pipes, the water level in the rising pipe portions 1b, 1b rises and the air in the pipe gas phase portion 14 is compressed as the water level rises. And water compression part 1
The water pressure of No. 3 rises, and this water pressure rise is displayed on the pressure gauge 15 provided in the middle of the injection hose 8.

Due to the increase in the pressure of the waterproof material replacement portion 13, a pressure difference is generated between the defective portion 2 and the ground 16 side, and this pressure difference gradually increases as the supply of the waterproof material in the pipe is continued. go. When this pressure difference becomes large to some extent, the injection and filling of the water blocking material into the ground 16 is naturally started.

The filling and filling of the waterproofing material into the ground 16 is carried out through the defective portion 2, and at the same time when the filling and filling is started, the increase in the water pressure of the waterproofing material replacing portion 13 is substantially stopped, and thereafter, it is stopped in the ground. The pressure is almost constant until the water material begins to solidify. Since such a pressure change in the replacement portion 13 is displayed on the pressure gauge 15, it is possible to confirm the start of the injection and filling of the water blocking material even on the ground.

Depending on the construction conditions, such as when the water level in the riser pipes 1b, 1b is low, a considerable amount of water still remains in the pipe before the pressure difference required for injecting and filling the water stop material into the ground is obtained. Sometimes it is necessary to supply lumber. In such a case, the lids 10, 10 may be supplied before or during the supply of the waterproof material in the pipe for the purpose of reducing the amount of the waterproof material and further the supply time.
Water and / or air may be replenished into the pipe through replenishment ports 11 and 11 provided in the.

When the water-stopping material is supplied to the water-stopping material replacing portion 13, and further, the water-stopping material is continuously injected and filled from the defect portion 2 into the ground 16, solidification of the water-stopping material begins in the ground 16 at some point. The injection-filling resistance and thus the injection-filling pressure rises.
This rise in the injection and filling pressure is sent to the pressure gauge 15 installed on the ground as a signal indicating the end of the water stoppage and is displayed, so that the end of the waterstopping material injection and filling can be confirmed on the ground.

In the present invention, the waterproof material is usually 1 to 20 minutes, preferably 2 to, although it depends on the working conditions.
A gel time of about 15 minutes is used. The gel tile of the water blocking material can be freely adjusted by changing the mixing ratio of the main agent and the curing agent.

In the process of replacing the accumulated water in the pipe in the low-place pipe portion 1a with the waterproofing agent, a time exceeding the gel time elapses until the pressure necessary for the replacement and the filling and filling of the ground with the waterproofing material is obtained. However, in this replacement step, the water blocking material is inevitably diluted to some extent by the accumulated water in the pipe, and the gel time is delayed, so gelation of the water blocking material in the pipe during the replacement step is prevented. There is almost no danger of this occurring. By the way, the time required for the replacement step is about 2 to 15 minutes, although it depends on the construction conditions. As long as the replacement step is limited, it is possible to use one having a relatively long gel time, for example, about 15 to 30 minutes only during the replacement step.

After the injection and filling of the waterproofing material into the ground 16 is started,
The time until the water blocking material begins to solidify in the ground 16 varies depending on the construction conditions such as the geology of the ground 16 and the height of the groundwater level, but is about 20 when using the gel time of 2 to 15 minutes, for example. It is about 60 minutes.

During the filling of the waterproof material into the ground 16, new waterproof material is supplied one after another on the line joining the injection nozzle 7 and the defective portion 2, so that the solid material does not solidify. Therefore, the water blocking material flow path 13a is secured, but this flow path 13a
On both sides of the water blocking material, solidification of the water blocking material occurs at least in the high concentration regions 13b and 3b.

While the filling and filling of the waterproofing material into the ground 16 is continued, the pressure in the flow path 13a is almost stable, but the waterproofing material is filled at the waterproofing material filling portion 17 in the ground 13. The temperature rises sharply when the solidification begins. This pressure increase is due to the injection nozzle 7
Also, since it is sent to the pressure gauge 15 via the injection hose 8, the injection and filling operation of the water blocking material can be immediately completed.

After the work of injecting and filling the water blocking material is completed, as shown in FIG. 7, a pipe cleaning machine 17 is applied to perform pipe cleaning. Since the waterproofing material residue remains in the pipe as a solidified product, in order to easily remove this solidified product,
As the water blocking material, a homogel type material having low strength after solidification is used.

By this cleaning of the inside of the pipe, it is possible to prepare for the inside lining work to be performed in the next step.

[0036]

According to the method of the present invention, after the accumulated water in the pipe and the waterproof material are replaced in the vicinity of the defective portion of the low-place pipe portion, the waterproof material is injected and filled into the ground through the defective portion. Therefore, it is possible to inject and fill the water blocking material into the ground at a high concentration, and it is possible to easily and stably carry out water blocking of the defective portion under a full water condition. Further, since the water blocking material is only partially replaced with the accumulated water in the pipe, the consumption amount of the water blocking material can be reduced as compared with the case where the water is completely replaced, and the pipe cleaning after the construction becomes easy.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view schematically showing a situation of water retention in a buried pipe to which the method of the present invention is applied.

FIG. 2 is a vertical sectional view schematically showing a situation of a wire passing step in the method of the present invention.

FIG. 3 is a vertical cross-sectional view schematically showing the situation of the position confirmation process of the defective portion.

FIG. 4 is a vertical sectional view schematically showing the alignment of the injection nozzle and the defective portion.

FIG. 5 is a vertical cross-sectional view schematically showing the state of the process of replacing the accumulated water in the pipe with the water blocking material.

FIG. 6 is a vertical cross-sectional view schematically showing the state of the step of injecting and filling the water blocking material into the ground.

FIG. 7 is a vertical cross-sectional view schematically showing a situation of a cleaning process in the tube.

[Explanation of symbols]

 1 buried pipe 2 missing part 3 stagnant water in pipe 4 working port 5 wire rod 6 TV camera 7 injection nozzle 8 injection hose 9 length measuring machine 10 lid 11 supplementary port 12 water stop material supply part 13 water stop material replacement part 14 air Phase part 15 Pressure gauge 16 Ground 17 Water-stopping material injection filling part 18 Pipe cleaning machine

Front page continued (72) Inventor Kato Satoru 4-1-2, Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture Osaka Gas Co., Ltd. (72) Tomoyuki Nakao 4--1, Hirano-cho, Chuo-ku, Osaka-shi, Osaka No. 2 Osaka Gas Co., Ltd. (72) Inventor Masanori Akita 1130 Shiomigatsu, Jinmeji-cho, Kaifu-gun, Aichi (72) Inventor Kazuhiro Hosono 118-2, Iwano-cho, Kasugai-shi, Aichi (72) Inventor Takayuki Kurobe Aichi 8-85 (72) Inventor, Yasuo Miyazaki, Tenpaku-cho, Tenpaku-ku, Nagoya-shi, Nagoya, Japan 2-16-6 Oimazari Minami, Higashinari-ku, Osaka-shi, Osaka (72) Akira Kamide 1 Nishi-Iwata, Higashi-Osaka, Osaka −10−21 (72) Inventor Katsuhisa Minami 1-4162-1-E 30-4 Nakatomigigaoka, Nara City, Nara Prefecture

Claims (1)

[Claims] 1. A water-stopping method for a water retention buried pipe including a laterally extending low-place pipe part in which the inside of the pipe is substantially full, wherein work ports are formed at both ends of the buried pipe. First step of passing a wire through the mouth over the entire length of the buried pipe, installing a TV camera in the buried pipe, and moving the camera in the low-place pipe portion using the wire to cause a defect in the pipe. By supplying the homogel-type water stopping material from the ground into the second step of confirming the position of the part and the bottom pipe part near the defect part confirmed in the second step, the defect part is mainly focused. And a third step of substantially replacing the accumulated water in the pipes in both sides thereof with the water blocking material, and utilizing the pressure difference between the inside and outside of the water blocking material supplied from the injection nozzle to the replacement portion. Then, through the deficient portion, fill and inject into the ground outside the deficient portion. Waterproofing construction method of water retention buried pipe, characterized in that.