| 摘要 |
1,178,219. Laying pipes. SOC. DES GRANDS TRAVAUX DE MARSEILLE SOC. ANON. 16 May, 1968 [31 May, 1967], No. 23303/68. Heading F2P. Pipe lines being laid from a pontoon on to the sea bottom are relieved of bending moment induced by swell by the use of a pivoted laying beam 1 having a power operated clamp 8 secured to the beam by long rods 16 to the beam at 20, and also having a pair of frames 21, 22 which include adjustable sets of four rollers by which the inclination of the cable can be adjusted (Fig. 8, not shown). The lower end of the beam forms a downwardly curved ramp (Fig. 5, not shown) provided with adjustable rollers 29 and fixed ones 32a ... 32d. The weight is counterbalanced by weight 10 connected over pulley 13 to the clamp 8. The inclination of the beam is set by rod 4 and rack 7. In order to lay pipe, a new section is mounted at the top of the beam and welded or screwed to the pipe line, rollers 33, 34 being power adjusted to give alignment. Other power adjusted rollers are also provided. A pipe laying trolley 38 rides up and down the beam from top position 39 to lower position 38<SP>1</SP>. This trolley clamps the pipe, and with clamp 8 released, it is fed down the beam as the pontoon moves forward, by winch 46 through irregular amounts dictated by the swell conditions. The tension rods 16 which hold clamp 8 are provided with lostmotion slots 17 at their top ends, so that it can easily be seen when the winch cable has fully taken up the pipe tension and clamp 8 can be released. In very bad weather, the pipe line is sealed by a stopper 50, Fig. 7, to which the winch cable 45 is secured. Rollers 29 are lowered and pulley 37 is raised to guide the pipe and cable as the pipe is lowered to the bottom while the pontoon moves forward. The cable winch, once again feeds at a variable rate to accommodate swell.
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