SU1423852A1 - Method of laying underwater pipe-line - Google Patents

Abstract

The invention relates to the construction and can be used in the construction of underwater crossings of main pipelines buried in the ground through various water barriers 1 (large rivers, reservoirs, sea straits and waters). The purpose of the invention is to increase the reliability of laying a long-distance underwater pipeline through water barriers with intense penetration of a trench under the influence of waves and currents. The installation of the pipeline is carried out from long lashes, which are subsequently buried directly in the places of their design position by joint dragging with the plow device. The lengthy straps 1, 2 are mounted on the shore, equip their ends with flexible joints 3 and the pontoons 4 are transported to the place of installation, from the design position of the whip at a distance equal to its length, the plow device 8 is placed, connected with cables 6 , 9 with traction means, for example, a tugboat, and a pipeline tip and joint pulling, deepen the whip into the underwater trench 5, join the raised ends of the lashes, weld and stack it into the trench, cutting off the pontoons 4 and the flexible iron elements 3. 4 il. S (l

Description

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The invention relates to the construction and can be used in the construction of subterranean passages buried in the ground, through various water barriers (large rivers, reservoirs, sea straits and waters).

The purpose of the invention is to increase the |

extension is achieved by the mono-equipment of its pontoons. Before the tips, the lashes are placed on the bottom of the plow sea. device 8, connect it with hauling cables b and 9 with the tips of a pipeline 1 pulled through by a pulling tool and by means of a traction means 7, - plow the plow device 8 and the lengthy lash 1 before digging its entire length into the underwater trench 5 designed by the plow device

(Fig. 2). Plow device may be

They are made of long lashes, which 10 are installed in front of the pulling head, successively digging in the immediate long lash at a given distance in the places of their design position by joint pulling with the plow device.

FIG. 1 shows the scheme of maintenance, dragging the first long strap without penetrating into the bottom; in fig. 2 - the same, with its deepening in the underwater trench being developed by the plow device; in fig. 3 - the end of dragging to the place of laying the second lengthy scourge without deepening it in the bottom; in fig. 4 shows the location in the underwater trench of the first and second long lashes after welding their ends and lowering them to the bottom.

According to the installation method

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at the beginning of transportation and transported to the place of its burial in an elevated above the bottom position by equipping it with pontoons or placing it on the floating craft, in this case the pull rope is fixed to the head of the plow unit, the rear end of which is connected with the rope to the head pulled whip, and in the area of its deepening plow device is lowered to the bottom of the sea. In another embodiment, the plow device is transported separately from the lash being pulled through to the place of its penetration.

After laying the first whip transovodnogo pipeline to the shore port a second long whip 2

length 2 without deepening it in the seabed (Fig. 3) at a distance equal to its length 2, from the end of the first, previously laid lengthy scourge 1, the conveyed scourge 2 is stopped and positioned in front of its head at the bottom of the sea is a plow device 8, which then dragging together with the second long whip 2, buried it in the underwater trail 5, developed by the plow rig, mounts the long I scaffolds 1 and 2, the ends of the whips I to be docked in the sea are equipped with a system of flexible damping elements 3 and pontoons 4, holding down of the lash ends at a given distance from the bottom of the submerged trench 5 and excluding their length until joining the pipeline to the previously laid scourge.

The length of the end sections of the lashes, equipped with 30

length 2 without deepening it into the seabed (Fig. 3) at a distance equal to its length 2, from the end of the first, previously laid lengthy scourge 1, the conveyed scourge 2 is stopped and positioned in front of its head at the bottom of the sea plow device 8, which then dragged together with the second long whip 2, buried it in the underwater trap 5, developed by the plow ustuschenny system flexible extensions -. roystvo before docking its front end

with the end of the first previously laid lash 1. After welding the ends of the lashes, the pontoons 4 are strutted with flexible fitting elements 3 located on the coupled ends of the whips, and the last pipe case depends on the pipe lowered to the bottom of the trench (Fig. 4 ). Even lifting scheme, parameters of the pipe-In the same sequence, lay the remaining length of the whip before completing the construction of the pipeline. The technical and economic advantage is to place the length of the length of the whip on the proposed technical solution for The lane (rail, roller, compared to the prototype is an upstream) or lowered into the flooded section of the reliability of laying the underwater chronal, paving the seaboard pipeline and providing the possibility of building cable 6, one end of which is connected to the sea pipelines of the large

elements and pontoons, depending on the method of joining the ends of the lashes in the sea without rising to the surface of the water (using underwater welding) or to the surface of the water,

wires and depths of the sea at the junction of lashes. If the relief of the seabed in the alignment of the pipeline is crossed, then it is planned.

by the first long length of 1 lamination (several tens of kilon 1, and the second with traction means meters) by pulling with a burial (tug or traction winch, installed on a barge) and transported first across the entire route under conditions of intensive whip to the place of installation without the submerged trench. Pick it up in the seabed (Fig. 1). The transport allows to reduce the width of the transport of the whip without deepening can be reduced, and laid in a narrow underwater

. Execution directly along the bottom of the water 55 trench requires less distribution, near the bottom or the free flow of ballast to ensure its stability to the sea, in the latter case of shear strength and ascent from impact should have a positive buoyancy of waves and currents.

equipping her with pontoons. Before the tips, the lashes are placed on the bottom of the plow sea. device 8, connect it with hauling cables b and 9 with the tips of a pipeline 1 pulled through by a pulling tool and by means of a traction means 7, - plow the plow device 8 and the lengthy lash 1 before digging its entire length into the underwater trench 5 designed by the plow device

(Fig. 2). Plow device may be

 installed in front of the tip of a lengthy whip pulled along a given length

at the beginning of transportation and transported to the place of its burial in an elevated above the bottom position by equipping it with pontoons or placing it on the floating craft, in this case the pull rope is fixed to the head of the plow unit, the rear end of which is connected with the rope to the head pulled whip, and in the area of its deepening plow device is lowered to the bottom of the sea. In another embodiment, the plow device is transported separately from the lash being pulled through to the place of its penetration.

After laying the first lash transport the second long lash 2

port the second lengthy whip 2

length 2 without deepening it into the seabed (Fig. 3) at a distance equal to its length 2, from the end of the first, previously laid lengthy scourge 1, the conveyed scourge 2 is stopped and positioned in front of its head at the bottom of the sea plow device 8, which then dragged together with the second long whip 2, buried it in the underwater trail 5, developed by the plow device, before joining its front end

extension (several tens of kilo meters) by the method of dragging from the depth of the formula of the invention

The method of laying the underwater pipeline, including installation on the bank of the pipeline, laying along the bottom of the water obstacle of the cable, installing a plow device in front of the head, connecting it to the pipe head and a cable, laying it in a submerged pipeline by pushing it together with the plow device, different in order to increase

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reliability of laying a large pipeline; installation is carried out from long lashes, the ends of which are equipped with pontoons and flexible fitting elements, the strings are successively transported without digging to the place of installation, the plow devices are positioned from the design position of the lash at a distance equal to its length they join the ends of the lashes, weld them and unload the trenches on the bottom, cutting off the pontoons and flexible loose elements.

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Claims (1)

Claim A method of laying an underwater pipeline, including mounting on the shore of the pipeline, laying a traction cable along the bottom of the water barrier, installing a plow device in front of the pipe head, connecting it to the pipe head and the traction cable, laying it in an underwater trench by pushing it together with a plow device, characterized in that, in order to increase the reliability of laying a long pipeline, the installation is carried out from long lashes, the ends of which are equipped with pontoons and flexible weighting e elements, the lashes are successively transported without deepening to the place of laying, the plow device is placed from the design position of the lash at a distance equal to its length; after deepening, the ends of the lashes are joined, welded and lowered to the bottom of the trench, removing the pontoons and flexible weighting elements.