JPS62228781A - Method of inserting exchanging construction of old pipe by non-drive - 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] [Field of Industrial Application] The present invention relates to an old pipe replacement method for replacing existing old pipes with new pipes without excavation in water supply, sewerage, etc. .

[Conventional technology]

Water and sewage pipes that have been buried underground for many years have been found to be damaged due to uneven settlement caused by physical and external factors such as traffic vibration from large trucks and nearby construction work, and are no longer functioning as buried pipes. This results in a decline in the performance of the plant, making it difficult to achieve the original purpose. Moreover, these problems are not only based on the physical and external factors mentioned above, but are also often due to chemical deterioration caused by the type of pipe used or the flowing contents of the pipe, or simply at the joint. This is not just a problem in one part of the pipeline, but a major problem affecting the entire pipeline.

If the pipe body is severely damaged or deteriorated, it can no longer be expected to have the strength to function as a strong member, and it is not possible to temporarily repair the damaged or deteriorated parts by simply renovating the pipe by lining the inside with epoxy resin, mortar, etc. However, the function of the entire conduit cannot be improved.

Particularly in urban areas, where water, sewage, and road facilities were constructed early on, in addition to repair techniques to counter deterioration, replacement techniques are needed to increase capacity as the number of users increases with urban development. This is now required as part of measures to improve maintenance and technology of the entire pipeline.

However, the method of replacing new pipes by excavation has many problems such as road conditions, local residents measures, long construction period, bulk of road pavement restoration pipes, etc. It has become very difficult.

[Problem that the invention seeks to solve]

Under the above circumstances, so-called pipe-in-pipe (Pipe
The pe-in-pipe (pe-in-pipe) construction method has been proposed and has a good track record as a non-trenchment method for replacing old pipes.

This method is superior in that it can be inserted over long distances relatively easily, but it inevitably reduces the cross-sectional area of the new pipe compared to the old pipe, which is expected to increase capacity in many urban areas. It is impossible to meet the requirements of

For this reason, methods have been proposed in which a sheath pipe with a larger cross-sectional area than the old pipe is rotated and advanced around the outer periphery of the old pipe, and a construction method in which the sheath pipe is press-fitted using hydraulic equipment, but the former method involves rotating the sheath pipe. There are problems with earth removal, and if the old pipe is broken, this becomes an obstacle and prevents progress. Furthermore, in the latter case, it can be carried out for short distances, but when the distance is long, it becomes difficult to press-fit the sheath pipe, which is a problem.

[Means and effects for solving the problems] The present invention has been made to solve the above problems, and provides a method for replacing buried old pipes with new pipes, in which at least one of the old pipes is replaced with a new pipe. A vertical shaft is provided on the side of the pipe, and a new pipe having a larger diameter than the old pipe is propelled around the outer circumference of the old pipe using an impact propulsion machine installed in the shaft, and the old pipe is appropriately removed. This provides a trenchless method for replacing old pipes.

[Example I]

FIG. 1 is a schematic diagram showing a construction example of the old pipe replacement method according to the present invention.

First, before explaining construction examples, we will explain the names, structures, functions, etc. of the equipment and other parts used in this construction method. , X
l-Xn (hereinafter sometimes represented by
are connected by. The starting shaft is a starting shaft constructed on the downstream side of the old pipe A reaching shaft B is constructed upstream of the starting shaft A at a predetermined distance (for example, 50 m) (see FIG. 4). This arrival shaft B has a new pipe in a predetermined position ti
c This is for confirming that a predetermined length has been reached, so it may be small. In water and sewage systems, conversion points and confluence points of the inner diameter of pipes, gradients, etc., are usually connected by manholes for hydraulic control and maintenance management reasons, and the maximum interval between them is 100 to 100 mm of the pipe diameter. It is said to be 150 times more.

Therefore, depending on the situation, the existing manhole may be used as is for the reaching shaft B.

1 is a pedestal installed in the starting shaft A, and 2 is an impact type propulsion machine mounted on the pedestal 1. This impact type propulsion machine 1 is
For example, it is commercially available under the trade name Grund Ram, and is loaded on a trolley 6 with wheels at the bottom, and compressed air from a compressor 7 (usually 6 to 7 kg/ff
l). Reference numeral 4 denotes a lever lock, one side of which is connected to the rear of the impact type propulsion device 2 via a spring, and the other side connected to a check 7, a wire, etc. 5.

Reference numeral 10 denotes a steel pipe (hereinafter referred to as new pipe) to be laid, which has a larger diameter than the old pipe X, and is loaded on a row 28° 8a provided on the frame 1. Reference numeral 11 denotes a shoe slightly larger than the outside diameter of the new pipe 10 attached to the tuyere of the new pipe 10 at the beginning, and is intended to reduce frictional resistance between the new pipe 10 and the ground when the new pipe 10 is propelled. . Reference numeral 12 denotes a striking surface attached to the rear end of the new tube 10, into which the head 6 of the impact propulsion device 2 (see FIG. 1(C)) is inserted. Reference numeral 15 is a water conduit pipe made of a small-diameter, thick-walled steel pipe attached to the top end of the inner surface of the new pipe 10. It is equipped with a number of spout holes at the tip (see Figure 2), and a threaded joint at the rear end. It is provided. Reference numeral 14 denotes a water pressure source, which is connected to the threaded joint of the water conduit 16 by a pipe 15 via a valve 14a. Jet water is ejected from the tip of H3.

In FIG. 1(C), 16 is a plunger for pulling out the old tube X, which has many claws at the tip as shown in FIG. 18.1
8a and levers pivoted to arms 18 and 18a 19.1
9a and a bottle 20 connecting the levers 19 and the other end of 19a.
This pin 20 is fitted into a long hole 21 provided in the main body 17, and when moving in the direction of the arrow, the arm 18,
18a rotates in the closing direction to facilitate advancement, and when moved in the opposite direction of the arrow, arm 18.18a rotates in the opening direction to allow the claw to dig into the inner wall of the old tube .22 is a winch, and its wire 23 is connected to the body 17 of 160 plungers.A fluid pressure cylinder is attached to this plunger 16, and its operating rod is operated by a winch.
20, and the arms 18.18a may be opened and closed by fluid pressure.

Next, an example of the construction method according to the present invention using the above-mentioned equipment will be explained.

(1) Starting shaft A is located at both ends of the old pipe X to be replaced.
A reaching shaft B will be constructed and the old pipes XI and Xn at both ends will be cut. In this case, the reaching shaft B may use a manhole.

(2) As shown in Figure 1(a), install the pedestal 1 at the bottom of the starting shaft A, lower the leading new pipe 10 into the starting shaft A using a crane, etc., and place it on the rollers 8, 8a. and set the impact type propulsion device 2 behind it (downstream side).

In this case, water/sewage pipes generally have a gentle slope due to the gravity flow system, so the head 6 of the impact type propulsion device 2 and the center line of the new pipe 10 are aligned with the old pipe X. It is necessary to set the pedestal 1 correctly so that it is located on the y center line.

(3) Attach the shoe 11 to the tuyere of the new pipe 10, and attach the striking surface 12 to the rear end, into which the head 6 of the impact type propulsion device 2 is inserted.

(4) Attach the check 7 of the lever lock 4, the wire etc. 5 to the new pipe 10, and integrate the new pipe 10 and the impact type propulsion device 2.

(5) The compressor 7 is started, and the impact propels the new pipe 10 along the outer circumference of the old pipe X concentrically, and the water pressure source 14 also adds water to the water guide pipe 13 and jets water from the tip. Then, the earth and sand E that has entered between the old pipe

As mentioned above, the shoe 11 is attached to the tuyere of the new pipe 10 at the beginning, and the jet water is spouted from the tip of the new pipe 10, so that when the new pipe 10 is propelled, the propulsion resistance from inside and outside is reduced. be able to.

(6) Φ) As shown in the figure, when the full length of the leading new pipe 10 has penetrated, the jet water injection from the compressor 7 and the water pressure source 14 is stopped, the lever lock 4 is released, and the new pipe is opened. Separate the impact propulsion device 2 from 1710 and move it backwards.

(7) Remove the striking surface 12 of the new pipe 10, and install the winch 22 on the frame 1 using a crane or the like.

(8> As shown in Figure (C) and Figure 3, old pipe X1
Insert the plunger 16 inside and remove the old w with the winch 22.
Pull the XI into the starting shaft A and carry it out of the mine using a crane, etc.

In this case, the dirt E between the old pipe X1 and the new pipe 10 has been washed away by the jet water, and the only resistance to pulling out the old pipe X+ is the restraining force of the joint Y, so extremely large forces are not required. do not need.

(91 Once the old pipe Xl has been carried out, the winch 22 is carried outside the mine, and the second new pipe 10a is suspended underground by a crane or the like and mounted on the rollers 8, 8a as shown in the figure (d). Then, weld it to the new pipe 10 at the beginning and connect it to the water conduit pipes 13, 13a.
Then, the pipe 15 and the water conduit 13a are connected to each other, and both are joined together.

0 [J In the same way as above, the impact surface 12 is deposited on the new pipe 10a, the impact type propulsion device 2 is set, and the compressor 7 is activated.
In this way, the new pipes 10, 10a, ... are successively connected and propelled, and the old pipes XI, X2, ... -Carry out.

In addition, in the propulsion method as described above, the impact type propulsion device 2 does not require a reaction force device, and only needs to be moved back and forth within the starting shaft A.

[Example　■]

FIG. 4 shows another construction example of the propulsion method according to the present invention, and this construction example is particularly effective when the propulsion resistance of the new pipe is relatively small. In addition, in FIG. 4), 25 is a dummy tube with an extrusion jig 26 attached to its tip.

In this construction example, the method of propelling the new pipes 10, 10a...10n is the same as in Example I, but the old pipe X1.
X2...Xn is not pulled out every time the new pipe 10 is pushed,
Leave it as is (Figure (a)). New pipe 10, 10a
.

... When the installation of 10n is completed, a dummy pipe 25 is inserted between the old pipe X1 at the rear end and the impact type propulsion unit 2, as shown in the figure, By applying a shock to 25, the old tube X! ~ Reach the entire Xn shaft B side 11C
Can be extruded. Therefore, it is only necessary to remove the old pipes X n -X t pushed out into the reaching shaft B one by one and transport them out of the mine using a crane or the like.

[Example III] This construction method is similar to the construction method of Example ① above, and as shown in Figure 5, after laying 10 to 10n of new pipe,
Install the winch 27 inside, pass the wire 28 with the hook 29 attached to the tip into the old tube X, hook the hook 29 to the end of the old 'fl The pipe X is pulled out into the reaching shaft B and is sequentially carried out to the outside of the mine. Note that the wires 28 are detachably connected at appropriate lengths to facilitate the removal of the old pipe X.

When the installation of a new pipe 10 to 10n of a predetermined length is completed using the various methods described above, remove the water guide pipe 13 for high-pressure jet water, clean the inside of the pipe, and coat the inner surface of the new pipe 10 to 10n with resin, mortar, etc. Lining.

By adjusting the thickness of this lining, it can be made to function as a water/sewage main that matches the planned landscape.

Alternatively, without lining the new pipe 10 to 10n, make the new pipe 10 to 10n a sheath pipe, insert a new pipe with the same diameter as the removed old pipe X, and make it function as a water/sewage main pipe. Good too.

When these works are completed, connect both ends of the new pipe 10 to 10n or the new pipe inserted into the new pipe to the existing main pipe, and backfill the starting shaft and arrival shaft, and the old pipe will be inserted. The replacement method has been completed.

The embodiments of the present invention have been described above, but during construction, the old pipe X to be removed may be partially submerged and meandering. The shoe 11 of the new pipe 10 may collide with the joint Y of the old wX. In this case, the new pipe 1 is crushed while the old pipe
All you have to do is promote 0. The crushing ability of the thruster type propulsion unit 2 has been confirmed through experiments and there are no particular problems, and since the old pipe X is to be removed, there is no particular problem even if it is locally broken.

In addition, if the propulsion resistance of the new Ir:f10 is extremely large, or if the new pipe 10 has a long installation distance, a pressurizing device 24 such as a hydraulic jack may be installed at the rear of the impact type propulsion device 2, as shown in FIG. It can also be set to increase the penetration force.

The method for replacing old water and sewerage pipes according to the present invention has been described above, but it goes without saying that the same method can be applied to other types of pipes as well.

〔Effect of the invention〕

As is clear from the above explanation, the non-invention trap provides the following remarkable effects.

(1) It is possible to increase the size of the new pipe and increase the capacity of the entire pipe.

(2) Old pipes can be recovered.

(3) Compared to normal propulsion machines, shaft equipment and equipment can be simplified.

(4) It is possible to shorten the construction period and reduce construction costs compared to the open-cut method.

(5) The slope of water and sewerage pipes is stricter than that of pipes for other uses, and in the normal pushing method using hydraulic equipment, directional control becomes difficult as the length of the pipe increases; In the present invention, since the old pipe serves as a guide, the direction can be easily maintained even if the installed length becomes long.

[Brief explanation of drawings]

i@1 Figures (a) to (e) are schematic diagrams for explaining an example of the construction method of the present invention, Figure 2 is a schematic diagram showing the state of earth removal, and Figure 3 is a diagram showing the state of pulling out old pipes. Schematic diagram, Figure 4(a)
, (1)) is a schematic diagram showing another construction method example of the present invention, No. 5
The figure is a schematic diagram showing another example of the construction method, and FIG. 6 is a schematic diagram showing an example of the construction method in which the penetration resistance is particularly large. A: Starting shaft, B: Arrival shaft, X: Old pipe, 2: Impact type propulsion machine, 4 niperlocks, 6 heads, 7: Compressor, 10: New pipe, 11: Seat, 12: Impact surface, 13:
Water pipe, 14: Water pressure source, 16: Plunger, 22.27
: Winch, 24: Pressure device, 25: Dummy pipe, 26
: Extrusion jig, 29: Hook.

Claims (1)

[Claims] In a construction method for replacing a buried old pipe with a new pipe, a vertical shaft is provided on at least one side of the old pipe, and an impact-type propulsion machine installed in the shaft is used to create a pipe on the outer periphery of the old pipe with a diameter larger than that of the old pipe. A trenchless method for replacing old pipes, characterized by promoting new pipes and appropriately removing the old pipes.