JPH076352B2 - Small diameter pipe propulsion method - Google Patents

Description

Detailed Description of the Invention [Object of the Invention] (Field of Industrial Application) The present invention relates to a small-diameter pipe propulsion method, and more particularly to improvement of a small-diameter pipe precision propulsion method.

(Prior art) Conventionally, when laying water supply pipes, sewer pipes or laying pipes for electricity, gas, etc. in urban areas, they are generally constructed under the road surface. Considering this, the excavation method from the road surface is eliminated and the underground propulsion laying method is adopted. However, this underground propulsion method does not cause any problem as long as the inner diameter of the pipe to be laid is relatively large and it is possible to work inside the pipe, but if the inner diameter is small, the laying pipe must be blindly advanced. When traveling, it is difficult for the pipeline formation direction and the propulsion direction to match, and the soil composition in the pipeline formation direction is not always uniform, and when the soil quality changes, the propulsion direction of the leading conduit and the desired pipeline The disagreement with the forming direction becomes severe.

In consideration of such a problem, an adjusting body having an inclined portion at the tip installed inside the outer propelling tube forming the outer shape of the leading conduit is operated, and the outer propelling tube according to the degree of wrong direction propulsion of the leading conduit is operated. The inclined portion is projected from the front end face of the, and the tip portion of the tip forming the inclined portion is rotated to the opposite side in the wrong direction, and the propulsion action is exerted on the adjusting body together with the outer propulsion tube while maintaining the protruding state. The small-diameter pipe long-distance precision propulsion method, in which the earth pressure action received by the propulsion action allows the leading conduit to change its directional path in a desired direction in accordance with the inclined portion and the amount of protrusion thereof. Is proposed.

(Problems to be Solved by the Invention) In the above-mentioned conventional technique, the looseness of the ground caused by excavation makes it easy to bend, and it is easy to bend due to biased pressure due to gravel or other obstacles, and further from the rear of the pipe. There was a problem that the tip of the tube was easily bent due to the pushing.

Therefore, an object of the present invention is to provide a small-diameter pipe propulsion method capable of favorably preventing bending of the leading conduit.

[Structure of the Invention] (Means for Solving Problems) The present invention relates to a fixing device capable of fixing the leading conduit to the natural ground while correcting the direction thereof, and an outer casing integrally formed at the tip of the inner casing. And fixing the front conduit to the natural ground by the fixing device while correcting the direction, and in this state, the outer casing is preliminarily propelled by using this front conduit as a guide, and thereafter, the fixation of the fixing device is released and the casing is preliminarily propelled. The leading pipe and the pushing pipe are adapted to be driven along.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 4, reference numeral 1 is a front conduit, and a plurality of fixing devices 2 are mounted on the outer peripheral surface thereof via grooves 2A. In this fixing device 2, both ends of a seal body 3 made of rubber or the like are fixed by a collar 4, and a jack 5 controlled by a fluid such as hydraulic pressure or pneumatic pressure is arranged in the collar 4. Further, a jack 6 is connected with a hose 6 which is connected to a pump, a compressor or the like (not shown) and supplies a fluid under pressure so that the fixing devices 2 can be independently controlled. Reference numeral 7 is a push-in pipe, 8 is an inner casing arranged in the front conduit 1 and the push-in pipe 7, and an excavating device 9 such as an auger screw is provided therein. Reference numeral 10 denotes an outer casing formed integrally with the tip of the inner casing 8 so as to cover the front side of the front conduit 1.
Reference numeral 11 denotes a starting shaft, which is a pushing device 12 for the inner casing 8 and the water removing device 9 and a pushing device 13 for the leading conduit 1 and the pushing pipe 7.
And are provided. Reference numeral 14 is a drive device of the excavation device 9. Then, as shown in FIG. 1, the leading conduit 1 is pushed into the wall of the starting shaft 11 without supplying the fluid to the fixing device 2.
Push in by 12, 13 propulsion jacks 12a, 13a, then second
As shown in the figure, the fluid is fed under pressure to each fixing device 2. Then, the piston of the jack 5 fixes the extruded conduit 1 to the inner wall surface of the excavation hole 15 through the extruding seal body 3 and fixes the extruded conduit 1 to the wall surface of the excavation hole 15. In this case, the bend of the front conduit 1 is fixed while correcting the bending of each fixing device 2 according to the fluid pressure feeding condition.

After fixing the front conduit 1 in the correct direction position as described above, the outer casings 10 and 8 are advanced by the pushing device 12 together with the excavating device 9 using the front conduit 1 as a guide as shown in FIG. Next, when the fluid in the jack 5 is drained, the piston disengages from the inner wall surface of the excavation hole 15 through the seal body 3 and the fixing device.
Unlock 12 After that, the leading conduit 1 and the pushing pipe 7 are propelled by the pushing device 13 along the outer and inner casings 10, 8 which have been propelled in advance. The above process is repeated to propel the small diameter pipe.

As described above, in the present embodiment, the outer and inner casings 10, 8 are preliminarily propelled while the front conduit 1 is fixed to the inner wall surface of the excavation hole 15 by the fixing device 2 in the correct direction position. Since the leading conduit 1 and the pushing pipe 7 are propelled along the line 8, bending due to resistance at the face is eliminated, and high-precision precision propulsion becomes possible.

The present invention is not limited to the above embodiments, and various modified embodiments are possible within the scope of the gist of the present invention. For example, it is possible to prevent the subsidence of the ground by performing the tube propulsion while injecting the chemical solution from the front conduit, and it is possible to apply various tube propulsion construction methods.

[Advantages of the Invention] The present invention includes a fixing device capable of fixing the front conduit to the natural ground while correcting the direction thereof, and an outer casing integrally formed at the tip of the inner casing, while correcting the direction of the front conduit. It is fixed to the ground by the fixing device, and in this state, the outer casing is preliminarily propelled by using the leading conduit as a guide, and then the fixing of the fixing device is released and propelled along the casing in which the leading conduit and the pushing pipe are preliminarily propelled. Since it is designed to do so, even if there is loosening of the ground due to excavation or biased pressure of gravel or other obstacles, precise propulsion can be performed with the guide pipe that is fixed at the correct position and direction correction is small. We can provide a small diameter pipe propulsion method.

[Brief description of drawings]

1 to 3 are schematic explanatory views of a propulsion sequence showing an embodiment of the present invention, and FIGS. 4 and 5 are enlarged cross-sectional views of a main part. 1 ... Front conduit, 2 ... Fixing device, 7 ... Pushing pipe 8 ... Inner casing, 9 ... Horizontal drilling device 10 ... Outer casing, 12, 13 ... Pushing device

Claims (1)

[Claims] Claim: What is claimed is: 1. In a small-diameter pipe propulsion method, in which a leading pipe and a pushing pipe are pushed by a pushing device arranged in a vertical shaft while excavating by a horizontal excavating device arranged in an inner casing, the direction of the leading pipe is corrected. While including a fixing device that can be fixed to the natural ground, and an outer casing integrally formed at the tip of the inner casing, while fixing the front conduit to the natural ground by the fixing device while correcting the direction, Using the tip conduit as a guide to advance the outer casing,
After that, the fixing of the fixing device is released, and the leading conduit and the pushing pipe are propelled along the casing that has been propelled in advance.