| 摘要 |
<p>1492151 Sub sea trench excavators SAIPEM SpA 11 Feb 1976 [11 Feb 1975] 05468/76 Heading E1F Submersible apparatus 1 that is advanceable stepwise in either direction along a submerbed pipeline 49 or like elongate member to dig a trench beneath the member comprises at least two longitudinally extending support members 31; two hoods 5 carried at opposite end regions of the support members and each having an open downward facing region; two sleeves carried one on each hood and each being formable from two arcuate elements, e.g. sectors 2, 3, capable of undegoing relative movement between a first position in which the sleeve is completed and second position in which the arcuate elements do not obstruct entry of the elongate member into the downward facing region of the hood on the apparatus descending onto the elongate member; two annular members each carried by a sleeve and each being formable from two arcuate cutter-carrying members e.g. sectors 4, 7, corresponding to and capable of being carried by the two arcuate elements respectively; first means 8, 29 for causing relative movement of the arcuate elements and arcuate members to complete full sleeves; second means 30 for causing rotation of the completed annular members with respect to the completed sleeves; and at least two clamping devices carried by the supporting members and capable of causing the apparatus to clamp on to the elongate element 49 or to move along the element. As shown one of the sleeve-forming arcuate elements 2, 3 is rotatably mounted on the hood 5 and can be rotated through 180‹ around the hood whilst the other element 3 is longitudinally slidable of the hood and can be so moved by ram 8 to enter the jaws of the element 2, when the element is covering the downwardly directed opening of the hood 5, to complete the sleeve and circumferentially align the arcuate, cuttercarrying members 4, 7, which can then be rotated around the sleeve by a motor 30 and a pinion 64 and gear ring associated with the members 4, 7. In a second embodiment the members 4, 7, comprise two half sleeves pivoted together in a region atop the hood 5. Material cut out of the trench by cutters e.g. roller cutters 27, 28 carried by the members 4, 7 is removed from the trench by suction pipes 52.</p> |
