SU1495557A1 - Method of constructing pipeline section on stationary off-shore platform - Google Patents

Abstract

The invention makes it possible to increase the reliability of fastening a pipeline section (TP) to a fixed offshore platform. Outside the platform, a vertically curved knee (K) of the TP is made, which is gradually lowered to the bottom by means of a hinged connection to the carriage moving along the rail with the upper and lower sections K increasing. On the vertical part of the TP section, fixed clamps evenly fasten with trolleys as this area is immersed. The mounting connection of the collars with the carriages is made movable and pivotal in the plane K. Before immersion, the connection is made stationary by welding, which makes it possible to eliminate the work of the diver and shorten the construction time of the transformer substation. 1 hp f-ly, 2 ill.

Description

The invention relates to the construction and can be used in the construction of offshore pipelines.

The purpose of the invention is to increase the reliability of securing the pipeline section to the platform.

FIG. 1 shows the stages of the implementation of the method; in fig. 2 is a section A-A in FIG. I.

The method is carried out as follows.

A pipeline section is made up consisting of a vertical part I, an elbow 2 with a length of 100-120 m and a horizontal part 3 with a length of 2000-3000 m outside platform 4.

On the vertical part 1, clamps 5 are fixedly fixed at a distance of 20–30 m. A pipeline section is equipped with pontoons 6 and transported to platform 4, onto which a guide 7 is pre-attached. Before the pipeline reaches the bottom, zooms 5 by means of axis 8 with a trigger 7 placed on the guide.

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a carriage 9 fitted with a sleeve 10. The connection of the axis 8 and the sleeve 10 is made movable and rotatable along a common axis, which ensures the required position of the vertical part 1, after which the axis 8 is connected with the sleeve 10 by welding. After disconnecting part of the floats 6, the vertical part is transferred 1 into the design position and the pipeline section is immersed by means of a crane 11 until the next clamp, which is also connected to another trigger car above the water mirror. As the pipeline section is lowered, the floats 6 are detached, keeping the horizontal part 3 afloat.

The use of the invention makes it possible to eliminate the work of divers when fixing the vertical part of the pipeline section on platform 4, as well as to increase its reliability of fastening in conditions of stormy weather. In addition, there is no need to / increase the horizontal part, which reduces the time required for the construction of the pipeline.

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Claims (2)

Invention Formula . A method of constructing a pipeline section on a fixed offshore platform, which consists in manufacturing the pipeline elbow bent in a vertical plane outside the platform, phasing it down to the bottom by means of a hinged connection to the trolley moving along the rail with an extension of the upper and lower sections of the knee, characterized in that in order to increase reliability securing the pipeline to the platform; on the vertical part of the pipeline section, fixed clamps are fixed evenly, which are connected to the bodies with hedgehogs as the pipeline section dives. 2. A method according to claim 1, characterized in that the mounting connection of the clamps with carriages is movable and rotatable in the plane of the bend of the pipeline, and before immersion it is made stationary by welding. / 7 (M A- A