JPS59134298A - Pipe propelling method - 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] The present invention relates to a pipe propulsion method.

The pipe propulsion method is a method in which a ready-made pipe is installed in a shaft and then pushed into the ground using jacks to construct a pipe, and is often used in the construction of sewerage pipes.

The problem with the pipe propulsion method is that the ready-made pipe bodies are sent one by one from the starting shaft, so the entire pipe underground must be moved.
The rear propulsion force must be increased as the burial distance increases.

The rear propulsion force is determined by the proof stress in the axial direction of the tube, and if it becomes larger than that, the tube will break and the distance it can be buried will be limited.

For this reason, a method has been adopted in which an intermediate pushing device is provided in the middle of the propulsion tube to achieve long-distance propulsion.

In the conventional pipe propulsion construction method, as shown in Figure 1, all the soil excavated by the cutting edge at the tip of the pipe body α was transported to the starting part C through the inside of the laid pipe body α, and the soil was discharged. If the inner diameter was less than 0.8 mm, soil could not be removed, and this tube propulsion method could not be used, making long-distance tube propulsion impossible.

The present invention has been developed in view of the above circumstances, and its purpose is to discharge the excavated earth and sand in a radial shape while propelling the buried pipe ahead of it by means of an intermediate pushing device, and to The buried pipe at the rear is propelled by a rear propulsion jack to enable long-distance propulsion of the buried pipe after small and medium openings [6].

Hereinafter, the present invention will be explained with reference to FIG. 3 and subsequent figures.

In the drawing, 30 is a starting shaft, and 3I is a reaching shaft.

A pilot hole 32 is drilled from the starting hole 30 to the destination hole 31 by a pilot hole drilling device (not shown). A pilot pipe 3 is frozen into this pilot hole 32 so that it can be divided into many pieces.
3, and a conveying device 34 such as a screw conveyor is inserted into this pilot tube 33. This conveyance device 3
4 has a structure that can be divided into many pieces like the pilot tube 33. Then, in the starting shaft 30, the tube propulsion machine 3
The excavation head 36 of No. 5 and the conveyance device [34] are rotated, and the earth and sand excavated by the cutter 37 of this excavation head 36 is thrown into the take-in slot 38 of the excavation head 36 and the conveyance device 34 side. The earth and sand are discharged into the reaching hole 31 through the pilot pipe 33 at 340 rotations.

The buried pipe 39 is sequentially press-fitted by the rear propulsion jack 40 as the excavation head 36 is propelled.

With a plurality of buried pipes 39 being pushed into the ground, an intermediate pushing device 41 is installed between the buried pipe 39 at the rear end and the buried pipe 39 to be buried. As shown in FIG. 6, this intermediate press device is equipped with an intermediate press joint 5, a front press ring 8, and a rear press ring 9. 5
The fitting portion 7 is fitted, and the rear press ring 9 for intermediate pressing is fitted into the internal pressing joint 5 along the receiving member 6 of the internal pressing joint 5. There is a jack I3 on the jack mounting seat of the rear press ring 9.
The main body side of the jack 13 is attached to the rod holder 1 of the jack 13 and the jack mounting seat of the front press ring 8 is attached. The front intermediate pressing ring 8 is fitted into the intermediate pressing joint 5, and the sealing mechanism 18 is fitted into the sealing mechanism insertion portion 10 of the front intermediate pressing ring 8. The lip portions 24 and 25 of the seal members 22 and 23 of No. 18 are in sliding contact with the inner circumferential surface of the intermediate push joint 5 to shut off water. The front part of the intermediate push joint 5 is slidably fitted into the insertion part 4 of the buried pipe 39 at the front.

Therefore, when propelling the buried pipe, the jack 13 is extended to propel the excavation head 36 and the buried pipe 39 in front.

Next, the rear propulsion jack 40 in the starting shaft 30 pushes the buried pipe 39 rearward from the intermediate pushing device A1, and at the same time the intermediate pushing device 4
The jack 13 of No. 1 is compressed to propel the buried pipe 39 at the rear.

Contrary to performing the above operation 00, a buried pipe 39 is laid underground between the starting shaft 30 and the reaching shaft 31.

Note that the pilot pipe 33 protrudes into the reaching hole 31 due to the propulsion of the buried pipe 39, but the protruding pilot pipe 33
The transport device 34 is disassembled within the reaching shaft 31 and carried out of the shaft.

The present invention is described in detail above, and in fc construction, after drilling a pilot hole 32 from the starting hole 30 to the reaching hole 31K, a pilot pipe 33 that can be divided into many pieces is inserted into the pilot hole 32, and inside the pilot pipe 33. A transport device 34 that can be divided into multiple pieces is inserted into the shaft, and the excavation head 3 of the tube propulsion machine 35 is inserted into the starting shaft 30.
6 and the earth and sand excavated by this excavation head 36 are passed through the entire pilot pipe 33 by the conveying device 34 to the reaching hole 31.
As the excavation head 36 is propelled, the buried pipes 39 are sequentially press-fitted by the rear propulsion jack 40. An intermediate pushing device 41y&: is interposed in the middle of the buried pipe 39, and this intermediate pushing device A1 pushes the buried pipe 39 forward of the intermediate pushing device 41. This is a pipe propulsion construction method characterized in that the buried pipe 39 is propelled and the buried pipe 39 behind the intermediate push device 4+ is propelled by a rear propulsion jack 40.

Therefore, while discharging the excavated earth and sand into the reaching shaft 31, the intermediate pushing device 41 is used to push the buried pipe 39tl forward.
- Buried pipe 3 behind the intermediate pushing device 711 along with the propelling stone
9 is propelled by the rear propulsion jack 40, it becomes possible to propel small and medium diameter buried pipes over long distances.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the conventional pipe propulsion method, and Figure 2 is the same as Figure 1■
3 and 4 are explanatory diagrams of one embodiment of the present invention, FIG. 5 is a longitudinal sectional view of the excavation head, and FIG. Figure 7 is a sectional view of the seal mechanism. 30 is a starting shaft, 31 is a reaching shaft, 33 is a pilot pipe, 3
4 is a conveyance device, 36 is a drilling head, 39 is a buried pipe, 40
is the rear propulsion jack, and 41 is the middle push device. Applicant Komatsu Construction Industry Co., Ltd. Agent Patent attorney Masaaki Yonehara Patent attorney Tadashi Hamamoto

Claims (1)

[Claims] After drilling a pilot hole 32 from the starting hole 30 to the arrival hole 31, a pilot pipe 33 that can be divided into many pieces is inserted into the pilot hole 32, and a conveying device 34 that can be divided into many pieces is inserted into the pilot pipe 33. , rotate the drilling head 36 of the tube propulsion machine 35 in the starting shaft 30 to
The excavated earth and sand is transferred to the pilot pipe 3 by the conveyor device 34.
3 into the reaching hole 31, and as the excavation head 36 is propelled, the buried pipes 39 are sequentially press-fitted with the rear propulsion jack 40.
An intermediate push device 41 is interposed in the middle of the buried pipe 39, and the intermediate push device 41 propels the buried pipe 39 forward of the intermediate push device 41, and pushes the buried pipe 39 behind the intermediate push device 711 with a rear propulsion jack. A pipe propulsion construction method characterized by propulsion at 40%.