JPS62159887A - Method of cut-off construction of underground buried pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] "Industrial application field" The present invention relates to a water stoppage construction method for underground pipes.

``Prior Art'' Various types of pipes, such as sewage pipes, often have cracks, especially at their joints. Also, it can cause scratches and leak.

In order to conduct internal inspections of pipe lines for scratches, fundamental damage, etc., sealed cameras, such as television cameras, equipped with illumination units and moved inside the pipe lines have been devised. Once the camera finds and pinpoints a crack or crack in the pipe, a cement can be pumped through the conduit to the sprue to seal the pipe and repair the crack.

Such a packer as a pipe leakage sealing machine is introduced, for example, in Japanese Patent Publication No. 16650/1983.

FIG. 4 is a perspective view of this packer 10 shown within tube II. Here, a pair of skins 1 in an expanded state
2 is a bag, usually a flat annular skin or sleeve, which is easily inflated by air pressure. packer 1
At both ends of the 0 are skids 13 and 14 with a plurality of skid legs 26 for sliding the bunker 10 into the tube 11 without inflating the skin 12. A center ring 16 is placed between the inflatable skins 12 and has a pair of apertures 17 defined therein. A hose 18 with a coupling device 20 is shown entering one end of the bunker 10 and connects to and passes through a casing located below the skin 12 for pneumatic or other fluid pressure lines. It is. However, in this diagram,
This casing is invisible.

, thus, by pumping pressure through the hose 18, the two skins 12 simultaneously expand and contract simultaneously. A pair of other hoses 21 and 22 are also connected to the packer 1.
0 and passes through a grouting chemical that seals the flaws and sprues in the tube 11.

Hoses 18. 21 and 22 are pipes 11, which are mostly underground pipes.
Hose 18 leads to the surface or entrance of an underground conduit in which is installed pneumatic and chemical pumping equipment to hoses 21 and 22.

The chemical agent entering hoses 21 and 22 passes through opening 17;
Tube 11. Ring 16. and fills the space 23 created between the two skins. Bolts 24 are threaded from skid 14 to skid 13 to bolt the device together with nuts 25. This puff car is equipped with a sealed television camera with a target to ensure the exact location of the sprue and, if possible, position the packer over the sprue so that the ring 16 is directly above the sprue. The skin 12 is expanded by air pressure through the hose 18 to create a space 23 that blocks the sprue, and the chemical The agent is injected through hoses 21 and 22 and opening 17 under sufficient pressure to force it into the sprue of the tube.

Reference numeral 26 indicates a plurality of curved skid legs for sliding the puff car into pipes, sewers, etc.

This type of sealing puff car is installed as shown in FIG. In the figure, a is a tube.

b is a bunker and d is a television camera. And the sixth
As shown in Figures (a) to 2), move the puff car b along the inside of the pipe a buried underground and search for the sprue C with the television camera d. Advance packer b by a predetermined distance to a location directly below point C (b), and bring the pair of inflatable skins e, e of packer b into close contact with the inner wall of tube a to block thin area C and secure it. Inject the binding material f (c). Next, the packer b is moved back slightly and the water stop state is inspected using the TV camera d (2).
This is to seal and repair the thin area C from the inside.

Here, it is preferable that the chemical agent quickly coagulates or coagulates, and if it hardens quickly, the packer can be moved to the next thin section of the pipe.

Therefore, as grouting chemical agents, chemical agents such as water glass and cement milk, as well as urethane and other chemical agents with quick solidification and high water-stopping properties, have been used.

Chemical agents such as urethane are of the hydration reaction type and can be injected with liquid, and in small amounts? It has a water stopping effect.

Specifically, when the isocyanate compound, which is the main component of grout, comes into contact with pore water underground, it reacts as shown in the following formula, generating carbon dioxide gas and forming a polyurea gel that is completely insoluble in water. make.

This polyurea is a hydrophobic, non-hydrophobic gel with a three-dimensional structure that strongly bonds between soil particles, creating strong compacted soil.

"Problems to be Solved by the Invention" However, the above-mentioned means have disadvantages as described below.

In other words, as mentioned above (leakage (intrusion water) at TV camera d)
We are checking the 11M locations and shutting off the water at 1 fl and 1 locations, but in most cases, the leakage (intrusion water) from pipe a is due to underground water flowing along the peripheral wall of pipe a. It happens to leak from the weakest joint or crack, and if you stop the water at that point, water will leak from the next weakest point.

In this way, all the joint parts are sequentially sealed off from water. Since there is a distance of 20 to 30 meters from one manhole to the next, water must be stopped at 10 to 15 joints.

In this way, since water is stopped one by one, construction can only be carried out at 10 to 15 locations per day.

As a result, the construction cost per day or per location increases.

In addition, even when surveyed with TV cameras, the situation is different between the dry season (October to March) and the rainy season (April to September), and even if there is no leakage during the dry season, it often leaks during the rainy season, so it is necessary to stop the water supply again. I am often forced to do so.

Also, since a water stop packer as shown in the diagram is used,
It is not possible to separately inject different types of building materials such as highly viscous chemicals and cement milk. That is, since the opening 17 is designed to have a small diameter in order to discharge the chemical liquid at high pressure and is equipped with a check valve, only a specific chemical liquid can be injected. Therefore, if there is a gap in the peripheral wall of the buried pipe or if there is a wide gap in the joint part, it may be difficult to stop water only with a chemical solution that is unlikely to fill the gap.

``Means for solving problems'' and ``effects'' The present invention was made in view of the above circumstances, and its gist is that a discharge hole of a predetermined diameter is bored at a predetermined location of a frame with a tip. A flexible pipe for injecting a waterproofing material is applied to a predetermined surface of the inner wall of the one span between the manholes of the buried pipe, and then a waterstopping packer made of an inflatable skin is set on the buried pipe, and air is injected into the pipe. At the same time, the pipe for injecting the water stop material is sent and rotated around the inner wall of the pipe, and the pipe for injecting the water stop material is also pressed against the inner wall of the pipe, or the pressing is performed by integrating the pipe for injection of the water stop material and the packer for water stop in advance. Under this condition, the water stop material is injected, and after the injection is completed, the air in the water stop packer is removed, and the water stop material injection pipe and the water stop packer are pulled up. With equipment,
We provide a construction method that has high construction efficiency and low construction cost and can seal off all leaking points in one span between manholes in buried pipes with just one injection operation, and also enables filling of voids in the surrounding walls of buried pipes. That's what I did.

"Example" This will be explained in detail below based on the drawings.

FIG. 1 shows a vibrator 2 for injecting water-stopping material according to the present invention, which is made of a flexible material such as PVC, and is inserted into the manhole 1 shown in FIG. 5 from the ground and bent at the bottom. tube a
can be extended to

Its tip is plugged 2a, and a water stop material discharge hole 2b is installed according to the joint part and water leakage position investigated with a TV camera.
No perforations were made.

At this time, the pore diameter is changed depending on the water-stopping material. In other words, depending on the gap to be stopped, the size of the crack, the size of the gap in the surrounding wall of the buried pipe, etc., it may be too large to inject a large amount of cheap cement milk to fill the gap, or it may be sufficient to fill the gap on the pipe wall surface (iii). When injecting expensive, high-performance drugs, the holes should be made small.

In addition, the injection point is usually the top of the pipe, but if the water stop material injection point is located at a place that is not located on one pipe extension line with respect to the top of the pipe, then Just add another pipe.

FIG. 2 shows a water stop packer 3 made of an inflatable skin, which is used to press and fix the water stop material injection pipe 2 to the wall surface of the pipe a, and a rigid wire 3a at the tip of the bag. A tension wire, ear 4, is fixed to the rear end rigid frame, 3b.
An air hose 5 is connected to. Its diameter and length are designed according to the pipe a.

FIG. 3 shows a construction mode using the pipe 2 for injecting the water stop material and the packer 3 for water stop.

In other words, the first order of construction is: (1) Set the injection pipe 2 on the upper part of the inner wall of the pipe a.

(2) Set the water stop packer 3.

(3) Send ate to the water stop bunker 3 and bring it into close contact with the inner wall of the pipe a. Knee 1 - The pressure is set higher than the drug solution injection pressure.

Approximately 51<g.

(4) Send and inject the water stop material into the injection pipe 2. Injection can be done with a pump or air pot. (Illustrated mode).

(5) When the injection is finished, remove the ate from the packer 3 and pull it up.

(6) Pull up the injection pipe 2 and clean the inside of the pipe to complete the water stop.

Incidentally, the above-mentioned seven openings, close contact, and withdrawal may be performed using the water-stopping injection pipe 2 and the water-stopping backer 3 that are integrated in advance.

The above is the normal construction procedure of the present invention, but if the gap in the surrounding wall of the pipe 9 is very large, for example, if the road is caved in, or if the water stop material has poor penetration depending on the soil quality,
At the same time as the injection in 4), it is also possible to drive an injection vibrator into the upper part of the buried pipe from the ground surface and inject from above. It can also be used in combination with conventional techniques. For example, with this construction method, you can roughly stop the manhole from manhole to manhole in one go, check the water stop status with a camera, and if there are any areas where the water has not stopped, use a conventional water stop packer to stop the water in only those places. do.

Further, as described above, the water-stop material injection vibrator 2 of the present invention may be prepared for rough-preventing use and for finishing use, and finishing may be performed twice.

"Effects of the Invention" The present invention according to the above-mentioned procedure has various effects as listed below.

(1) Construction efficiency is increased 3 to 4 times compared to conventional construction methods.

(2) Construction costs are low.

(3) I! Jl materials are easy and cheap.

(4) Water can be stopped even if the void is large.

(5) Even if the void is large, the pond can be strengthened by changing the water material.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams of the main equipment used in the construction of the present invention, Figure 3 is a longitudinal cross-sectional view showing the construction mode of the present invention, and Figure 4 is an explanatory diagram of the packer used in the conventional construction method. FIG. 5 is a longitudinal sectional view explaining its usage, and FIGS. 6(a) to 6(d) are conventional construction procedure diagrams. 2- Vibrator for injecting water-stopping material, 3- Packer for water-stopping. 4-Tension wire, 5-Air hose. 2---iyR11itAl#'(de 3---
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Claims (1)

[Claims] A flexible water stop material injection pipe with a discharge hole of a predetermined diameter drilled at a predetermined location with a stopper at the end is inserted between the manholes of the buried pipe.
A water stop packer made of an inflatable skin is placed on a specified surface of the inner wall of the span, and then a water stop packer made of an inflatable skin is set on the buried pipe, and air is sent to bring it into close contact with the pipe inner wall, and the pipe for injecting the water stop material is also placed on the pipe inner wall. The water stop material is injected under this condition, and after the injection is completed, the water stop material is stopped. A water stoppage construction method for underground pipes characterized by removing the air from the water packer and then pulling up the pipe for injecting the waterstop material and the waterstop packer.