SU131168A1 - The method of penetration into the soil underwater pipelines - Google Patents

Description

The invention concerns methods of embedding subsea pipelines into the ground with the use of scraper winch hydraulics ejected by cables. In this work are carried out by the method of the shuttle, buried the pipeline Rusami for several passes and without backfilling trenches.

A method of developing underwater trenches with ledges, using two or more successively placed hydroejector devices, allowing the subsea pipeline to be lowered to the design marks in one pass. This makes it possible, at the same time with the development of a trench, to backfill the pipeline through a slurry pipeline connecting the hydro-ejector devices.

When two or more hydroelectric devices are connected in series with their slurry pipelines included in a common slurry pipeline, hydroejector can in one pass deepen the subsea pipeline to be laid onto any design mark in the bottom of the reservoir while simultaneously filling it with soil from the developed trench.

FIG. 1 and 2 shows an exemplary arrangement of hydroelectric devices for the development and backfilling of trenches according to the described method (with the ejection of the first layer of soil behind the edge); in fig. 3 and 4 is the same (without ejection of the first layer of soil for the curb).

During simultaneous operation of two hydraulic ejection devices, when the front device has slurry pipelines aimed at discharging slurry over the curb of trenches, and the next — backfilling the pipeline (Figs. 1 and 2), the pipeline dredges and stacks into the trench to a depth of 2.5-3. , 0 m with simultaneous filling with soil, taken out by the second device.

No 131168-2 In the case of successive work of two hydroelectric devices with the inclusion of their pulpwaters in the common ground drain (Fig. 3 and 4), the pipeline is deepened into the trench to the same depth and completely filled with the soil removed from the trench.

Subject invention

A method of embedding subsea pipelines into the ground using hydro ejector devices alternated by cables of a scraper winch, characterized in that, in order to lower the subsea pipeline to a predetermined depth and simultaneously fill it in one pass, the development of the underwater tranche is led by two or more successively located hydroelectric devices with simultaneous feeding the excavated soil through the pipeline to fill the pipeline sections laid on the design marks.

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