SU1668554A1 - Design of steel pipe coupling in sea platform - Google Patents

Abstract

The invention relates to the field of hydraulic structures. The purpose of the invention is to increase durability and simplify the fabrication of the structure. The design of the joint of steel pipes in the offshore platform contains elongated reinforcing bars 4, located around the circumference in the internal cavity of the pipes being joined, and shortened reinforcing bars 4 in the internal cavity of the main pipe 1, and arranged in an ellipse. The reinforcement rods 4 are interconnected by the reinforcing wire 5, the annular ribs 7 are located on the inner surface of the adjacent pipe 2, and the internal cavity of the connected pipes in the location zone of the reinforcing rods 4 is filled with fine-grained concrete 8. 3 Il.

Description

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SL

WITH

The invention relates to the construction of joints of steel pipes in offshore platforms and can be used in the structures of offshore stationary bases for the development of offshore oil and gas fields.

The purpose of the invention is to increase durability and simplify the fabrication of the structure.

FIG. Figure 1 shows the design of the joint of steel pipes in a marine platform; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one.

The design of the joint of steel pipes contains the main pipe 1 and the adjacent pipe 2 interconnected by a welded body 3. In the inner cavity of the connected pipes in the area of the abutment reinforcing bars 4 are interconnected by interconnecting wire 5. and parallel to the axis of the adjacent pipe 2, The rods extending from the cavity of the adjacent pipe into the main cavity are connected by sections of reinforcing wire 6 to reinforcing bars 4 located in the main pipe 1 behind the projection of the adjacent pipe 2, which are arranged in an ellipse Su, the large axis of which coincides with the axis of the main pipe 1. On the inner surface of the adjacent pipe 2 at the installation site of the elongated reinforcing bars 4 are annular ribs 7, a. the internal cavity of the connected pipes at the installation site of reinforcing bars is filled with fine-grained concrete 8,

The assembly of the proposed construction is carried out as follows.

A hole is cut into the main pipe 1, the size of which is equal to the size of the inner diameter of the adjacent pipe 2, into which shortened reinforcing bars 4 are connected, interconnected by sections of reinforcing wire 6, and are arranged in an ellipse, the major axis of which coincides with the axis of the main pipe 1, then Into the inner space of an ellipse formed by shortened reinforcing bars 4, a frame of elongated reinforcing bars 4, connected by reinforcing wire 5, is inserted, with the diameter of the skeleton of elongated reinforcing bars The rods 4 are smaller than the size of the cut hole in the main pipe 1. After performing the described operations, 1 part of the frame protruding from the main pipe opening of the elongated reinforcing rods 4 and reinforcing wire 5 is attached to the adjacent pipe 2 with annular ribs 7 and the pipes are welded by welding cppm 3 -

Barely the internal cavity of the pipes at the installation site of reinforcing bars is filled with fine-grained concrete 8.

The proposed compound design

Steel pipes in the offshore platform works as follows.

When alternately compressing and stretching forces are applied to the adjoining pipe 2 due to the adhesion of concrete 8 with annular ribs 7 and elongated reinforcing bars 4 of variable cross section, the latter are engaged in tensile work and perceive tensile forces, since by means of concrete 8 and

the shortened reinforcing bars 4 are connected to the main pipe 1. When the adjacent pipe 2 is compressed, the load through the annular ribs 7 is transmitted through the concrete 8 to both the elongated reinforcing bars 4 and

the concrete itself, which distributes the compressive force to the shell material of the main pipe 1.

The proposed design of steel pipes in the offshore platform, taking into account the good performance of reinforcing rods for stretching and good performance of concrete in compression, provides favorable conditions for partial removal of the load from the weld 3, in which significantly less fatigue stresses will occur upon application of alternating load , which contributes to the durability of the offshore platform, and the elimination of the need to maintain welding

work in the inner cavity of the joined pipes leads to the simplification of the manufacturability of the construction.

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Claims (1)

Invention Formula The design of the joint of steel pipes in the offshore platform, including the main and adjacent pipes, connected by a welded seam, characterized in that 5 that, in order to increase durability and simplify the fabrication of the structure, it is provided with annular ribs mounted on the inner surface of the adjacent pipe, as well as reinforcing 0 rods interconnected by a reinforcing wire and placed in the internal cavities of the pipes being connected parallel to the axis of the adjacent pipe, the reinforcing rods extending from 5 internal cavity of the adjacent pipe into the internal cavity of the main pipe, connected by reinforcing wire with reinforcing rods located in the internal cavity of the main pipe and beyond the projection of the adjoining workpiece 166685546 at the same time, the internal cavities of the connecting rods are filled with fine-grained concrete pipes in the installation zone of the reinforcement n.  x :: v. ft 0 "V    . X. “b. P1  . . G. . about g ° ...;" .at.- .at..; ..at .about... ".:",.  L 5 7 .about... ".:",. . J