Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1977-12-02
1979-04-17
Crowder, Clifford D.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
37195, 37 64, 405162, E02F 502
Patent
active
041493265
ABSTRACT:
An apparatus for digging a trench beneath a pipeline laid on the bottom of sea or a water body, in which a clamp arrangement is split into a wider sector portion and a narrower sector portion which, as they are united under the control of a driving mechanism, embrace the pipeline and allow a set of digging discs to excavate the ground beneath the pipeline. Provisions are made to remove the debris on completion of digging. The apparatus is driven along the pipeline and means are provided to maintain both the correct vertical trim of the entire apparatus and the correct position of the pipeline track.
REFERENCES:
patent: 3004392 (1961-10-01), Symmank
patent: 3338059 (1967-08-01), Tittle
patent: 3434297 (1969-03-01), Gretter et al.
patent: 3583170 (1971-06-01), De Vries
patent: 3717003 (1973-02-01), Bates, Jr. et al.
patent: 3732701 (1973-05-01), Lynch
patent: 3857250 (1974-12-01), Di Tella et al.
patent: 3926003 (1975-12-01), Norman
Bonvini Giuseppe
Casagrande Guido
Giovannini Umberto
Po Fernando
Predonzani Niso
Crowder Clifford D.
Saipem S.p.A.
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