Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement
Patent
1989-09-25
1991-08-13
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Repair, replacement, or improvement
405138, 405154, F16L 1036
Patent
active
050392530
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates generally to excavation and earth moving, and more particularly concerns a method for trenchless laying of pipes and an arrangement for carrying out the method.
The invention can be used with success for laying pipes 300-800 mm in diameter.
BACKGROUND OF THE INVENTION
There is known a method for trenchless laying of pipes in which a pipe is lowered down a vertical shaft and then forced through the ground in a preset direction.
An arrangement for carrying out the method comprises a power unit secured in a shaft chamber for forcing the pipes in the ground, and a device for evacuating the ground (cf., U.S.S.R. Inventor's Certificate 662, 669).
A disadvantage of this method and arrangement is that the length to which the pipe can be forced into the ground is limited. This limitation is accounted for in that the entire force produced by the power unit is imparted to the end of the pipe inside the shaft, whereas the strength and rigidity of the pipe are low, making the pipe susceptible to deformation.
There is also known a method for trenchless laying of pipes in which pipe sections are forced through the ground in a preset direction, the pipe sections being lowered down one of vertical shafts and removed as they are forced through the ground from the second vertical shaft, after which a stationary pipe is layed. Forcing each pipe section is accompanied by removal of earth using screw conveyers and earth working equipment for evacuating the earth. In this method, use is made of pipe sections of a diameter substantially greater than the diameter of stationary pipes layed subsequently, which is necessitated by positioning in such pipe sections of the earth working and conveying equipment.
In addition, such methods require substantial technical facilities, and are very expensive.
An arrangement for carrying out this method comprises a power unit engageable with the rear end of each pipe section as they are forced through the ground, at least one intermediate hydraulic power unit positioned between two adjacent pipe sections and capable of relative movement as they are forced into the ground, and earth working and conveying means. The intermediate hydraulic power unit has the form of a hydraulic power cylinders arranged about the periphery inside the pipe sections (cf., West German Publication 3,122,710).
One disadvantage of the above arrangement resides in that in the confined space for working the ground, the hydraulic power cylinders of the intermediate power unit constrict the useful working space inside the pipe. This construction of the intermediate power unit makes access to the shaft chamber difficult and complicates evacuation of earth from the shaft, resulting in low efficiency of the arrangement. Another disadvantage is that the hydraulic power cylinders are rigidly secured to the adjacent thin-wall pipe sections, whereby substantial forces imparted by the cylinders can deform the pipe sections to result in low reliability of the prior art arrangement.
SUMMARY OF THE INVENTION
The present invention aims at providing a method for trenchless laying of pipes and an arrangement for carrying out the method in which pipe sections are forced through the ground and the ground is evacuated so as to result in more efficient pipe laying, reduce the amount of equipment used for pipe laying, and ensure that the method and arrangement could find application even for laying pipes 300-800 mm in diameter.
The aims of the invention are attained by a method for trenchless laying of pipes in which pipe sections are forced through the ground in a preset direction, these sections being fed to one of a plurality of vertical shafts, forced through the ground, and removed from a second vertical shaft while simultaneously laying a stationary pipe. According to the invention, in the course of forcing the pipe, sections lengthwise of the pipe the ground of a diameter equal to the inside diameter of the pipe sections is cut off from the ground mass to remain immobile relative to it
REFERENCES:
patent: 3169376 (1965-02-01), Cunningham
patent: 3613384 (1971-10-01), Jacobs
patent: 4095435 (1978-06-01), Uemura
patent: 4146347 (1979-03-01), Woods
patent: 4388020 (1983-06-01), Uemura et al.
patent: 4432667 (1984-02-01), Richardson
Bestransheinaya ukladka truboprovodov, 1956, Gosudarstvennoe izdatelstvo literatury po stroitelstvu i arkhitekture, pp. 4-7.
N. Ya. Korshenbaum et al., "Prokhodka gorizontalnykh i vertikalnykh skvazhin udarnyn sposobom", 1984, Nedra, pp. 22-24.
Grigoriev Sergei M.
Kantovich Leonid I.
Svechkopalov Anatoly P.
Vasin Sergei A.
Ricci John A.
Taylor Dennis L.
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