| 摘要 |
1,070,609. Laying pipelines. BROWN & ROOT Inc. March 24, 1966 [May 21, 19651, No. 13033/66. Heading F2P. For laying offshore pipelines in particular, a floating vessel, 5, manoeuvred by anchored lines 11, carries roller assemblies 7, 8 and 8a for slidably supporting the pipeline 1, the assemblies 8 and 8a and, if desired; the assemblies 7 being pivotable and vertically adjustable, and a tensioning mechanism 10 comprising, on a fixed frame (1006), Figs. 15 and 17 (not shown), a plurality of spaced-apart, dual, air inflated rubber tyre assemblies (1007) and a similar plurality of tyre assemblies (1002) mounted on a frame (1001) movable vertically with respect to the frame 1001 by hydraulic piston-cylinder devices (1011), (1012) and so that variable tensioning forces can be applied to opposite sides of the pipeline; the tyre assemblies (1002) and (1007) are interconnected and rotated by hydraulic motors (1022) and (1025). Attached to the vessel for pivotal movement about a vertical and horizontal axis is an inclined ramp 6 comprising laterally spaced pontoons (601), (602), Fig. 2 (not shown), divided longitudinally into chambers provided with valves connected by air lines to controls on the vessel and interconnected by conduits (612) carrying rollers for slidably supporting the pipeline and valves also connected by air lines to controls on the vessel. The buoyancy of the ramp is varied by selectively and independently admitting air into the chambers or causing the expulsion of water ballast therefrom; the lower end of the ramp has additional pontoons (613), (614) attached thereto, and the upper end of the ramp is adjustable vertically with respect to the roller assembly 8a, the connecting mechanism 9 including hook latches which are operated by hydraulic piston-cylinder means to engage the ramp pivot shaft.
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