JPH036314B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for laying underground pipes using double pipes, which is adopted when metal pipes such as gas pipes, water pipes, sewer pipes, electric cable storage pipes, etc. are propelled underground. It is something.

Next, the present invention will be explained in detail using illustrated examples.

The drawing shows an example in which the present invention is applied to laying a bent pipe, and the order of the laying work will be explained below.

(1) Shallow starting side vertical shaft 6 and destination side vertical shaft 7 are excavated and formed in advance at the excavation start point and the destination point.

(2) A transport truck transports a water tank 8, a large number of main pipe units 1 consisting of bent steel pipes with anti-corrosion coating on the outside, and guide pipes 2 on both sides of the diameter of the outside.
A large number of sheath pipe units 3 made up of bent steel pipes fixed by welding are transported and placed on the ground at the pipe laying construction site.

(3) The work truck 11 carrying the crane 9, the tilting guide device 10, the engine generator, the welding machine, the hydraulic unit, etc. is aligned with the starting shaft 6 and stopped, and the crane 9 is used. Then, the raising/lowering guide device 10 is erected and inserted into the starting side vertical shaft 6. This tilting type guide device 10 has a large number of semicircular grooved guide rollers 12 for curved pipe gripping guides that are arranged at intervals in the vertical direction and whose positions in the lateral direction can be adjusted. By adjusting the position of the curved pipe, the angle of the curved pipe can be adjusted in the horizontal and vertical directions to achieve accurate alignment with respect to the curved pipe arrival point.

(4) After inserting the folding type guide device 10 into the launch side vertical shaft 6, insert the extending jacks 13 attached to the four side parts of the folding type guide device 10.
By operating the hydraulic unit, the reaction force support plates, which are separately extended and attached to the tips of the extension jacks 13, are pressed against the wall surface of the starting side vertical shaft 6. The device 10 is firmly fixed to prevent the tilting type guide device 10 from being displaced due to excavation reaction force and pushing reaction force.

(5) Insert the first inner main tube unit 1 into the first outer sheath tube unit 3 and support it via the slide guide 14, and attach a motor to the front end of the main tube unit 1. Built-in sludge pump 15
With the hydraulic motor 17 for rotating the bit 16 having a diameter larger than the outer diameter of the sheath tube unit 3 attached, the sheath tube unit 3 is moved in a predetermined direction by the guide roller 12 of the folding guide device 10. Support.

(6) Inject into the starting shaft 6.

(7) Grip the rear end of the first main unit 1 with the chuck 19 attached to the pushing jack 18, and drive the pushing jack while rotating the bit 16 by operating the hydraulic motor 17. 1
8 and push the main pipe unit 1 into the ground by an appropriate length. Next, after releasing the chuck 19, the pushing jack 18 is extended, the chuck 19 grips the sheath tube unit, and then the pushing jack 18 is shortened, so that only the sheath tube unit 3 is pushed deep into the ground. The main pipe unit 1 and the sheath pipe unit 3 are connected in a sealed state by welding or a special joint. In this way, the main pipe unit 1 and the sheath pipe unit 3 are pushed in alternately and repeatedly.

(8) After the start of pushing, fill the gap between the sheath pipe 3 and the main pipe 1 at an appropriate time to keep it filled with water.

(9) When jointing the pipes, perform the main pipe unit first and the outer sheath pipe unit later.

(10) After propelling and laying the main pipe and sheath pipe to the target point, hold the main pipe on the target point side.

(11) While injecting mortar from the ground on the starting side through the guide pipe 2 into the gap between the excavated hole 4 and the main pipe, pull out the sheath pipe toward the starting side.

In addition, in FIG. 1, 20 is a mud removal hose, 21
is an underground culvert waterway.

The above embodiment is an example in which the present invention is installed using a main pipe and a sheath pipe made of a curved pipe, but this invention uses a main pipe and a sheath pipe made of a straight pipe to lay the pipe in a straight line in an inclined state. It can also be carried out when installing in. Furthermore, when connecting the main tube units and the sheath tube units to each other, the connection may be carried out with the main tube unit inserted into the sheath tube unit in advance.
Furthermore, mortar injection may be performed separately after the outer sheath tube is removed.

According to this invention, in a method of propelling and laying a metal pipe underground while excavating the ground in front of the metal pipe, the sheath has guide pipes 2 fixed to the outer surfaces of both sides in the diametrical direction of the sheath pipe extending in the longitudinal direction of the sheath pipe. Pipe unit 3,
The main pipe unit 1 inserted into the sheath pipe unit 3 is sequentially and alternately connected to form a sheath pipe with a guide pipe and a main pipe, and the work of excavating and propelling the main pipe and guiding the guide device 10 is performed. The work of propelling the sheath pipe with the guide tube while being guided by the rollers 12 is carried out sequentially and alternately, and after the main pipe is propelled and laid to the target point, the main pipe is held on the target point side, and then the sheath pipe with the guide tube is started. Since only the main pipe is laid underground by pulling it out to the side, propulsion can be carried out without attaching guide materials such as guide pipes to the inner main pipe, and the outer periphery of the main pipe is completely coated with anti-corrosion treatment. It is possible to install the main pipe without damaging the anti-corrosion coating on the outside surface of the main pipe, and since there is no gap left between the main pipe and the ground after the main pipe is laid, it is possible to prevent ground subsidence. Furthermore, compared to the case where the double pipe is laid underground and the outer sheath pipe is left, this invention is economical because the sheath pipe can be reused, and it is also possible to penetrate the double pipe underground. After laying, if the inner main pipe is pulled out and the outer sheath pipe is left underground, the problem arises that the corrosion protection of the sheath pipe will be incomplete and it cannot be used as the main pipe. In the case of the invention, this problem can be solved because the outer sheath tube is pulled out and the inner main tube is left. Furthermore, since it can be carried out on both easy-to-collapse and hard-to-collapse soils, the construction method can be standardized, and since only the main pipe can be laid in one installation process, the process is shortened and the propulsion and pulling out Effects such as easy construction using equipment can be obtained.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a vertical cross-sectional side view showing the state in which a double pipe is being laid underground, and Fig. 2 is a cross-sectional plan view of the pipe guide section. , Figure 3 is a longitudinal cross-sectional side view of the chuck part.
FIG. 4 is a longitudinal sectional side view showing a state in which the sheath tube is being pulled out while being injected and filled with mortar. In the figure, 1 is the main pipe unit, 2 is the guide pipe, 3 is the sheath pipe unit, 4 is the excavation hole, 5 is the mortar, 10 is the folding guide device, 12 is the guide roller, 14 is the slide guide device, and 15 is the sludge pump,
16 is a bit, 17 is a hydraulic motor, 18 is a pushing jack, and 19 is a chuck.

Claims (1)

[Claims] 1 In a method of propelling and laying a metal pipe underground while excavating the ground in front of the metal pipe, a guide pipe 2 extending in the longitudinal direction of the sheath pipe is provided on both outer surfaces of the sheath pipe in the diametrical direction.
The sheath pipe unit 3 to which the sheath pipe is fixed and the main pipe unit 1 inserted into the sheath pipe unit 3 are sequentially and alternately connected to form a sheath pipe with a guide pipe and a main pipe, and the main pipe is excavated. Promoting work and guidance. device 10
After the main pipe is held at the target point side, the main pipe is held at the target point side, and the sheath pipe with the guide pipe is advanced while being guided by the guide rollers 12 of the guide pipe. A method for laying underground pipes using double pipes, characterized in that only the main pipe is laid underground by pulling out the main pipe to the starting side.