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Installation method of makeshift section of buried 780mpa pressure steel pipe

A pressure steel pipe and installation method technology, applied to non-detachable pipe connections, pipes/pipe joints/pipe fittings, passing components, etc., can solve the problems of high welding residual stress, high labor intensity of workers, high installation costs, etc., and achieve welding stress And the residual stress is small, the installation period is shortened, and the effect of reducing the residual stress

Active Publication Date: 2018-01-16
STATE GRID CORP OF CHINA +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the existing 780-grade steel pipe joint installation technology has difficulties in installation, poor installation quality, long installation time, high installation cost, high labor intensity of workers, high residual stress of welding and poor stress state, etc. question

Method used

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  • Installation method of makeshift section of buried 780mpa pressure steel pipe
  • Installation method of makeshift section of buried 780mpa pressure steel pipe
  • Installation method of makeshift section of buried 780mpa pressure steel pipe

Examples

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Effect test

Embodiment

[0030] Example: The installation method of the makeshift section of buried 780MPa pressure steel pipe, such as figure 1 shown, including the following steps:

[0031] a. Make the make-up festival: Make the make-up festival into a half-eight shape;

[0032] b. Installation of upstream steel pipe and downstream steel pipe: install and fix the upstream steel pipe and downstream steel pipe of the improvised joint;

[0033] c. Fit joints in place: place the joint joints in place, and control the deviation between the joint joints and the center of the upstream and downstream nozzles ≤ 2mm;

[0034] d. Treatment of the gap between the make-up joint and the upstream and downstream steel pipes: control the clearance between the make-up joint and the upstream and downstream nozzles ≤ 2mm;

[0035] e. Crimping: control the misalignment between the improvised joint and the upstream and downstream nozzles ≤ 2mm;

[0036] f. Welding: Welding adopts segmental regression welding.

[0037...

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Abstract

The invention discloses an installation method of a buried 780MPa pressure steel pipe adjuster, which comprises the following steps: manufacturing of the adjuster, including manufacturing the adjuster in a semi-splayed shape; installation of an upstream steel pipe and a downstream steel pipe, including installing and fixing the upstream steel pipe and the downstream steel pipe; in-place placement of the adjuster, including placing the adjuster in place and controlling the deviations between the adjuster and the centers of the openings of the upstream and downstream steel pipes to be less than or equal to 2 mm; treatment of gaps between the adjuster and the upstream and downstream steel pipes, including controlling the gaps between the adjuster and the upstream and downstream steel pipes to be less than or equal to 2 mm; seam pressing, including controlling the misalignments between the adjuster and the upstream and downstream steel pipes to be less than or equal to 2 mm; and welding, wherein back-step welding is adopted. The installation method has the characteristics of simplicity in installation, good installation quality, short installation time, low installation cost, low manual labor intensity, small residual stress, good stress state and the like.

Description

technical field [0001] The invention relates to a method for installing a makeshift joint, in particular to a method for installing a makeshift joint of a buried 780MPa pressure steel pipe. Background technique [0002] During the installation of buried pressure pipelines in water conservancy and hydropower projects, axial offset and mileage deviation of pressure pipelines are unavoidable, so it is necessary to use makeshift joints to compensate for these problems. The traditional methods for improvised joint installation are tile type and casing type. The specific installation method of the tile-type improvised joint is to buckle the tiles on the outer wall of the installed upstream and downstream pipe sections, weld the Г-shaped plate on the installed upstream and downstream steel pipe ends, tighten the wedges, draw lines, and Tighten the wedge at the edge of the gas cutting to align it with the installed steel pipe; this method is very difficult to install the improvised...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L13/02
CPCF16L13/02
Inventor 刘启明杜天棕何少云曹玺丁光王海涛谷守新
Owner STATE GRID CORP OF CHINA
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