JPS6332937B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for connecting an attached pipe such as a domestic drain pipe to an underground pipe such as a main drain pipe.

``Prior art'' When attempting to connect an attached pipe such as a domestic drain pipe to an underground pipe (main pipe) such as a main drain pipe, conventionally, the main pipe was located 2 to 3 feet from the ground surface. When buried at a depth of 3 m, the diameter of the cut opening is usually small and the depth of the hole is shallow, so as shown in Figure 8,
Excavation 1 (figures a and b) exposes the connection part 3 of the main pipe 2, and while looking directly at it, connect the mounting pipe 5 using mortar 4 (figures c and d). 4 to 5 m.
When buried at a depth greater than 1,000, the diameter of the excavation opening becomes large and cannot be tolerated due to the relationship with adjacent houses, etc., and the depth also becomes large, requiring consideration of protection walls, means of elevating, etc. Because of the situation, we first excavated a hole up to 2 to 3 meters deep and connected the main pipe to the bottom level of the manhole (vertical hole).
A spare pipe to be connected to the main pipe is buried, and then an attachment pipe is connected to the spare pipe, and eventually the attachment pipe is connected to the main pipe in a bypass manner through the spare pipe and the manhole.

``Problem to be solved by the invention'' However, although excavation in the above-mentioned method is essential for reliable connection work, it is not allowed even at a depth of 2 to 3 meters due to severe housing conditions. In addition, it is an expensive work to begin with, and especially in the case of 4 to 5 m, as mentioned above, the cost of bypass piping will be added.

``Means for Solving the Problems'' The present invention was made in view of the above-mentioned circumstances, and its gist is to locate drilling holes on the earth's surface using positioning signals from sensors such as television cameras installed in the main pipe. After determining this, use a boring machine to drill a hole up to the main pipe position, then replace the cutting blade and drill a hole in the main pipe to match the diameter of the attachment pipe, which is smaller than the drilling diameter. After removing the boring machine, Insert the mounting pipe through the hole, insert its tip into the hole to make a temporary connection, and pour the void filling fixing material to a predetermined height rising from the temporary connection to fix it, and backfill the top with soil. On the other hand, in the main pipe, a coagulant injection seal using a pipe leak sealing packer is attached to the connection part, and the pipe opening is plugged with a water stop plug. The point is that it allows connection of mounting pipes.

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

That is, FIGS. 1 to 6 show the construction procedure of the present invention. First, the television camera 3 placed inside the main pipe 2 is
A positioning signal is sent to the ground surface from a sensor installed at the bottom of the hole, and the position of the hole to be drilled by the boring machine 31 is determined (FIG. 1).

Drill a hole 32 with a boring machine 31 to the main pipe 2 position (Fig. 2).

In this case, if there are defects such as hollowing due to water leakage in the buried part of the main pipe 2, or soft ground,
It is advisable to stop drilling 40 to 50 cm before the main pipe 2 and perform root hardening by injecting cement milk or chemical solution.

Next, replace the cutting blade with a smaller diameter one that matches the diameter of the mounting pipe 5', make a hole in the main pipe 2, remove the boring machine 31, insert the mounting pipe 5' through the hole 32, and cut the tip of the cutting blade. into the hole to make a temporary connection (Fig. 3).

A predetermined height of rise from the temporary connection part (40 to 50
cm) and fix it by pouring a void filling fixing material 33 such as mortar (Figure 4), and backfilling with soil above it (Figure 5).

On the other hand, a pipe leak sealing plug 34 is arranged inside the main pipe 2, and a water stop plug 35 made of a pneumatic expansion bag or the like is dropped into the opening of the attachment pipe 5' to seal it. After that, a coagulant is injected and sealed, and the connection is plugged from the inside to complete the main connection (Fig. 6).

The above-mentioned television camera 30 and pipe leak sealing packer 34 are both existing devices that are moved inside the main pipe 2 by being pulled by a wire 36, and will be briefly explained as follows.

That is, in order to conduct an internal inspection of the pipe line for flaws or fundamental damage within the main pipe, a sealed camera, similar to a television camera, equipped with an illumination unit and moved inside the pipe line has been devised. Once a flaw or leak in a pipe is detected and pinpointed by a camera, a hole is drilled near the leak and a coagulant is pumped through the conduit to seal the pipe and repair the leak. Can be buried.

Such a pipe leak sealing machine is proposed, for example, in Japanese Patent Publication No. 16650/1983. The pipe leak sealing machine is covered with an airtight inflatable skin,
It has a pair of hollow casings with a skid mounted adjacent to one end of each skinned casing and the other end of each casing having a center ring. are placed facing each other. Connecting devices such as bolts are threaded through hollow sections of the casing from one skid to the other, and the entire device is bolted together. The inflatable skin covering the casing is closed at both ends by tightening skids together, which are tightened by tightening diagonally serrated edges on the distal ends of the casing. , along with the overlapping parts of the skids,
The skins are tightened to each casing. The overlapping portions of the skids are angled from the distal end of the casing and are tightened to uniformly press the skin against the diagonally serrated edges of the casing. The center ring has similar overlapping edges on each side for simultaneously tightening and sealing the other end of the inflatable skin to the other end of each casing in the same manner. The unit can be easily disassembled by loosening the bolts that pass through the skids, replacing worn and damaged parts, and
It can also be assembled by tightening the bolts. Thus, there is no need to cut the inflatable skin to avoid the common trouble of tearing or abrasion of the inflatable skin in situations where the inflatable skin is rapidly manipulated. Air is compressed and directed through the casing to inflate the inflatable skin and create a space between the center ring and the interior of the tube.

The air is also blocked by a pair of inflatable skins and a rapidly solidifying crouching agent is pumped through the center ring for sealing action, as shown in FIG. 7 within tube 11. FIG. Here, the pair of skins 12 in an expanded state are
It is a bag, usually a flat, annular skin or sleeve, that is inflated by air pressure. At each end of the packer 10 there are skids 13 and 14 having a plurality of skid legs for sliding the packer 10 into the tube 11 without inflating the skin 12. center ring 16
is installed between the inflatable skins 12, and a pair of liquid medicine discharge ports 17 are attached thereto. Connecting device 20
A hose 18, shown entering one end of the packer 10, is a pneumatic or other fluid pressure line that connects to and passes through the casing located below the skin 12.
However, this casing is not visible in this view. Thus, by applying pressure through hose 18, the two skins 12 simultaneously expand and contract simultaneously. A pair of other hoses 21
and 22 are also shown within packer 10 to pass crouching chemicals to seal flaws and leaks within tube 11.

Hoses 18, 21 and 22 extend along the length of pipe 11, which is usually an underground pipe;
are connected to the ground surface or to the inlet of an underground pipe in which the equipment for delivering the chemical agent to the pneumatic and hoses 21 and 22 is located. The chemical agent entering the hoses 21 and 22 passes through the chemical outlet 17 and the ring 16, and then enters the pipe 1.
1. Fill the space 23 created between the ring 16 and the two skins. Bolt 24 is nut 25
In order to bolt the devices together, they are passed from skid 14 to skid 13. This patcher is a targeted seal to ensure the exact location of the leak and, if possible, position the patcher over the spot so that the ring 16 is directly above the leak. It operates by locating flaws in the tube 11 using a device such as a television camera, and the skin 12 is activated by air pressure passing through the hose 18 to provide a space 23 to block the leak. The expanded chemical agent is then injected through the hoses 21 and 22 and the chemical outlet 17 under sufficient pressure to force it into the leak in the tube.

Preferably, the chemical agent quickly coagulates or solidifies, allowing the packer to be moved to the next leak in the pipe.

"Effects of the Invention" The above-mentioned feature of the present invention is that cutting is not required, and since cutting is not required, there are various merits listed below.

(i) Less traffic nuisance.

(ii) It saves time.

(iii) low cost;

(iv) Space (the space for construction may be small) (v) Construction machinery is small and simple.

(vi) Few construction workers.

[Brief explanation of the drawing]

1 to 6 are procedure diagrams of the present invention, FIG. 7 is an explanatory diagram of a pipe leak sealing machine, and FIGS. 8 a to 8 are explanatory diagrams of conventional connection procedures. Explanation of symbols, 1...Trench, 2...Main, 3...
Connection part, 4...Mortar, 5...Mounting pipe, 5'...
...Mounting pipe, 10...Pass car, 11...Pipe, 12
...Skin, 13,14...Skin, 16...
Ring, 17...Medical solution outlet, 18...Hose,
21, 22...hose, 24...bolt, 25...
... Nut, 30 ... Television camera, 31 ... Boring machine, 32 ... Drilling, 33 ... Gap filling fixing material, 34 ... Packer for sealing pipe leaks, 35 ...
...Water stop plug, 36...Wire.

Claims (1)

[Claims] 1 After determining the drilling position on the ground surface using positioning signals from sensors such as TV cameras placed in the main pipe, use a boring machine to drill the hole up to the main pipe position, then replace the cutting blade and install a hole smaller than the diameter of the hole. Drill a hole in the main pipe according to the diameter of the pipe, and after removing the boring machine, insert the mounting pipe through the hole and insert its tip into the hole to make a temporary connection. Pour the void filling fixing material into the pipe to fix it, and backfill the top with soil. Meanwhile, inside the main pipe, install a coagulant injection seal using a pipe leak sealing packer at the connection part to seal the pipe opening. A method for connecting a mounting pipe to an underground pipe, which is characterized in that it is plugged with a plug and then removed.