| 摘要 |
In laying submarine pipelines and the like in ice covered water, the pipeline is made up horizontally on a make-up platform. The platform is supported over the pipeline route and above the water surface and a covering ice sheet on a cushion of air which has a pressure sufficient to cause breakage of the adjacent ice. The pipeline is fed into the water rearwardly from the make-up platform. A support platform is disposed rearwardly of the make-up platform and is coupled to the make-up platform by a bridge structure. The pipeline, at spaced locations rearwardly of the make-up platform, is engaged by corresponding ones of a plurality of separately operable coupling assemblies. The coupling assemblies are supported by cables and winches at corresponding spaced locations along the bridge structure and the support platform. The effective lengths of the several cables are adjusted to define a desired support path for the pipeline. The coupling assemblies are moved relatively along the pipeline toward the make-up platform in conjunction with the feeding of the pipeline from the platform and in conjunction with the advancement of the platforms along the line of the pipeline. Preferably, the coupling assemblies are distributed along that portion of the pipeline which includes the overbend and sag-bend of the pipeline between the make-up platform and the sea floor. At least some of the coupling assemblies are operated to inhibit movement of the pipeline therepast away from the make-up platform so that the coupling assemblies serve to maintain tension in the pipeline between the make-up platform and the sea floor.
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