Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Repair – replacement – or improvement
Patent
1976-11-10
1979-12-04
Corbin, David H.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Repair, replacement, or improvement
175 61, 405154, F16L 104
Patent
active
041769856
ABSTRACT:
A system and method for emplacing a relatively large casing under and spanning an obstacle such as a river is disclosed. A liquid-occupied passageway is excavated along an arcuate path beneath the obstacle between positions at or near ground level on either side. A casing of lesser diameter than the passageway is introduced into the passageway following the excavating apparatus. A transport fluid is introduced at the excavating site to entrain the cuttings resulting from the excavating. The casing is non-rotatably advanced along the arcuate path of the passageway, and the transport fluid and entrained cuttings are collected in the interior of the leading end of the casing. The transport fluid and entrained cuttings are evacuated under positive pressure from the interior of the leading portion of the casing to prevent the cuttings from settling in the ground circumscribing the advancing casing. The interior of the casing is sealed off proximate the leading portion thereof to provide buoyancy to the casing in the passageway. The casing is weighted to substantially neutralize the buoyancy of the casing and thereby minimize friction between the casing and the sidewalls of the passageway to facilitate advancement of the casing into the passageway.
REFERENCES:
patent: 3589135 (1971-06-01), Ede
patent: 3830545 (1974-08-01), Sugden
patent: 3894402 (1975-07-01), Cherrington
Oil & Gas Journal, Jan. 26, 1959--vol. 57, No. 4, p. 105.
Corbin David H.
Reading and Bates Construction Co.
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