SU815166A1 - Arrangement for driving underwater pipeline into soil - Google Patents

Description

(54) DEVICE FOR DECAYING IN GROUND OF A SUBMARINE PIPELINE

one

The invention relates to the construction, in particular to the deepening of subsea pipelines located at the bottom of the reservoir or below the bottom marks.

A device is known which, moving along a pipeline, develops a trench with the help of cutters beneath it. A disadvantage of the known device is the possibility of pipeline damage by cutters.

It is also known a device comprising a load, a pump with a drive, pressure conduits and nozzles directed in different directions in the horizontal plane 2.

The disadvantage of this device is that it is cumbersome, inconvenient in operation and cannot be used when working with ice.

The purpose of the invention is to simplify the device and the expansion of technological capabilities.

This goal is achieved by the fact that the load is made of two parts that are hingedly interconnected, the upper part of which is hollow for placing ballast, and the lower one is U-shaped with a supporting platform for installing the pump and is driven downwards. in the vertical plane, with the supporting platform at the bottom provided with a replaceable seat, and the discharge conduit with a mechanism for switching the water supply from the main group of nozzles to an additional one.

FIG. 1-3 schematically shows the proposed device.

The device consists of a load 1, made in the form of a ballast tank and a load 2, interconnected by a hinge 3. The load 2 is U-shaped and includes a supporting platform 4, above which is an airtight chamber 5. In chamber 5, a pump 6 with an electric motor 7

Claims (2)

In addition, there are pressure conduits 8 on the cargo with a remote supply and water switching mechanism 9, a group of nozzles 10, with openings directed downwards, and a group of nozzles 11 directed in opposite directions from the load 2 along the buried pipeline 12. At the bottom of the load 2 replacement seat 13. The arrows indicate the direction of the jet interacting with the ground and causing pipeline 12 to descend below the bottom of the reservoir. The length of the ballast tanks 1 depends on the depth of the water in the place of work and the thickness of the bottom soil layer to which the pipeline 12 is buried. The ballast tanks 1 are filled with water, soil or other material so that the total mass of the burial devices will lower the pipeline 12 on project marks. The device operates as follows: several pipes are installed at some distance from each other, and to fully fit them into pipe 12 from the pump 6, water is supplied through the conduits 8 only to nozzles 10, whose openings are directed downwards. The jets emanating from the nozzles 10 bring the soil under the device into a liquefied state, due to which the latter, under the weight of its weight, sinks until the seat 13 is fully seated to the pipeline 12. The presence of the joint 3 contributes to the fit of the cargo 2 to the pipeline 12 when it is located under angle to the horizon. Then, using the remote water supply switching mechanism 9, the group of nozzles 10 is turned off, and all the water is supplied to the nozzles 11. The jets emanating from the nozzles AND, along the curve of elastic bending of the pipeline 12, bring the soil into a mobile state. Thanks to the action of the jets, the pipeline is immersed in the ground to the required elevations. When the pipeline reaches the design marks by means of the switching mechanism 9, all the reference water is supplied to the nozzles 10, after which the device is removed and moved to the not yet buried part of the pipeline 12. The application of the proposed invention allows to reduce the amount of earthworks due to the exclusion from the production process of developing trenches under the pipeline and its backfilling after deepening, and also ensures that the design marks of the pipeline are preserved in the process of backfilling. In addition, the device allows you to refuse the bulky guide frames and pressure hoses that feed water from the pumps, which simplifies the work and makes it possible to deepen the pipelines in the most benign, in terms of hydrology and navigation, the winter period (low water levels floods and swellings, ice cover). At the same time, the deepening can be carried out not only in sandy, but also in dense clay soil, and to use local soil and soil for loading. water Claim 1. Device for embedding a subsea pipeline into the ground, including a load, a pump with a drive, pressure ducts and nozzles placed in a hermetic chamber. Directed in opposite directions in a horizontal plane, characterized in that, in order to simplify the device and to loosen the technological possibilities, the load is made of two parts, pivotally interconnected, the top of which is made hollow to accommodate the ballast; and the lower one is U-shaped with a support platform for installing a pump with a drive, and has an additional group of nozzles directed downwards in the vertical plane. 2. A device according to claim 1, characterized in that, in order to deepen pipelines of different diameters, the supporting platform is provided with a replaceable seat from below. 3. The device according to claim 1, characterized in that the pressure conduit is provided with a mechanism for switching the water supply from the main nozzle group to the additional one. Sources of information taken into account in the examination 1.Patent of France No. 2167550, cl. E 02 F 5/00, published. 08/24/73. 2. USSR author's certificate number 104845, cl. E 02 D 29/06, 1956. to ni I f ID Fig 2