SU131170A1 - Submarine Trench Development Device - Google Patents

Description

In order to penetrate the underwater pipelines to a depth of 2.5-3.0 m into the ground while simultaneously filling them with the ground removed from the trench, an installation mounted of two or more hydroejector devices interconnected by a slurry line extended to the section already laid on the project elevation and backfill pipeline. Such hydroejector devices, supported by grooved rollers on the pipeline and moved by cables of the scraper winch, have one pair of hydraulic ejectors with hydraulic rippers, powered by centrifugal pumps with electric motors, which are placed in hermetically sealed covers.

If there is only one such device, it acts as an underwater suction dredger with pulp ejection at the trench curtain during the development of the first russians of the trench. For each cycle, the device makes one working and one idle moves. The pipeline is filled with the last stroke.

The proposed device is made with two pairs of oppositely directed hydro jets and reversing valves, which allows for light penetration of subsea pipelines into the ground by the shuttle method without idling.

The diverter valves are installed one at a time on the pulp and injection pipes, and they are controlled by rocker arms connected to the cables of the scraper winch.

FIG. 1 and 2 depict a hydro-ejector device for the development of underwater trenches in two projections; in fig. 3 and 4 is a diagram of the location of the hydro-ejector device on the route of the pipeline that is being buried by the Russian method when pulp is ejected; in fig. 5 and 6 - the same, when backfilling the buried pipeline.

No. 131170-2 -

Double-acting hydro ejector device is mounted in two metal hermetically sealed corns. The housings are interconnected by means of saddles 2. In each metal casing / one centrifugal pump 3 and one electric motor 4 are installed. The pumps and electric motors are mounted on metal frames 5 with bolts. The shafts of the pumps and electric motors are connected to each other by flexible couplings 6. The device is equipped with two rollers 7, the shafts of which are laid in bearing 8. By means of rollers 7 the device can be supported on the buried pipeline and move along it along the developed trench back and forth using a scraper electric winch .

Pumps 3 receive clean water through the suction nozzles 9, and water from the pumps into the annular chambers of the suction ejector tips 10 is supplied through the discharge pipes //. From the annular chambers, the water through the nozzles 12 and 13 enters at high speed into the diffusers 14 and to loosen the sucked soil from the developed trenches.

To ensure the two-sided operation of the device on the discharge pipes, there are two butterfly valves / 5 with rocker arms 16, one for each pipe, making it possible to change the direction of water flow from the pumps to the two front hydrojectors or to the two rear ones.

Cross over valves 15 with rocker arms 16, guide rollers 17 through which tension cables 18 with spring compensators 19 pass, provide automatic switching of water coming from the pumps while simultaneously changing its movement from the front hydro ejector tips to the rear and back, depending on changing the direction of movement along the buried pipeline during the development of the trench and backfilling it. The removal of the intake pulp ocy-i is existent with diffusers 14 and pulp lines 20, on which there are switch valves 21, which make it possible to change the direction of movement of the pulp either from the two front or from the two rear hydroejectors, depending on the change in the direction of movement of the tube deeper along the depth emu pipeline.

The valves 21 are automatically switched by the pulp pus passing through the slurry pipes 20. On the slurry lines 20, besides the switching valves 21, there are gland devices 22 (one on each slurry pipe) allowing the installation of discharge pipelines at any angle to developed trench during pipeline deepening.

The lower support beams and pipe-holders' posts consist of separate collapsible pipes 23, 24 and 25. The support beams are provided with skis 26, which are the basic supports when the pipe-laying truck moves along the ground both during the development of trenches and during its transfer from one place to another another.

A single-sided hydraulic ejection device, when it is first pushed through the laid pipeline to the bottom of the reservoir, forwards or backwards works like an underwater dredger with pulp ejection, it is worked out by the developed trench (Fig. 3 n 4), and during return sinking, it works with a plow deaerator with pulp transport to fill the pipeline, laid in a trench (Fig. 5 and 6). For each penetration, the pipeline is buried in a trench of 1.25-1.5 m. For two penetrations, the pipeline is laid in a trench to a depth of 2.5 to 3.0 "with simultaneous backfilling with soil during the return flow.

Subject invention

An apparatus for the development of underwater trenching, movable cables scraper winch provided with hydroejectors with hydroripper E and retraction conductive slurry pipeline, centrifugal pumps with motors, placed into sealed casings, and opirayuschees through grooved rollers in the pipeline, characterized in that, in order tiered recessed in the soil of the underwater pipelines without idling and backfilling them during the last course, it is made with two pairs of oppositely directed hydroejectors and throw-over valves s (one for pulpootvod and s and discharge tubes) steerable yoke connected to the winch cables scraper.

- 3 - # 131170

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