Butt welding construction method of large diameter underground pipelines

A technology for underground pipelines and construction methods, applied in welding equipment, manufacturing tools, arc welding equipment, etc., to achieve the effects of saving backfill earthwork, reducing excavation space, and improving welding quality

Inactive Publication Date: 2010-06-09
SHANGHAI BAOYE GRP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the above-mentioned defects of butt welding of existing undergr

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  • Butt welding construction method of large diameter underground pipelines

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Embodiment Construction

[0017] Below, further illustrate the present invention in conjunction with specific example:

[0018] A construction method for butt welding of large-diameter underground pipelines, including several sections of steel pipes buried under the surface to be connected, the method comprising:

[0019] Groove form: V-shaped groove, the entire pipe jacking nozzle is divided into two parts (the upper part and the lower part), the groove of the upper part faces outward, and the groove of the lower part faces inward;

[0020] Welding position: fixed horizontally;

[0021] Welding method: carbon dioxide gas shielded welding (GMAW), and the welding method of single-sided welding and double-sided forming;

[0022] Welding sequence:

[0023] ① The welding process is symmetrically welded by the welder at the same time;

[0024] ② The welding process adopts multi-layer and multi-pass welding;

[0025] Internal and external groove joint treatment

[0026] After the entire nozzle is welded...

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Abstract

The invention relates to a pipeline welding technology, in particular to the welding of large diameter pipelines. The invention discloses a butt welding construction method of large diameter underground pipelines, which comprises a plurality of steel pipes to be butted which are buried below the surface, and comprises the following steps of: beveling, assembling and cleaning the butt connector of a steel pipe, welding, and cleaning and detecting, wherein the bevel adopts a V-shaped bevel; the steel pipe is divided into an upper part and a lower part which are symmetrical with each other from a horizontal midline, the bevel of the upper part faces outwards, and the bevel of the lower part faces inwards; for the upper part of the pipeline, a constructor welds the top of the pipeline, and welds the inner part of the pipeline for the lower part of the pipeline; the bevel is cleaned after welding, and appearance and non-destructive inspections are performed. The method not only can improve the butt welding operating efficiency, but also is in favor of ensuring the construction quality and reducing the construction cost.

Description

technical field [0001] The invention relates to pipeline welding technology, in particular to large-diameter pipeline welding. Background technique [0002] For butt welding of large diameter underground pipelines, there is a high requirement for the tightness of the welding joints. At the same time, for construction, since the pipelines are generally buried underground and have a large diameter, if all external grooves are made, the welder will operate outside the pipeline. When the bottom is welded, the workers need to work upwards, which is not easy to ensure the quality, and the construction is difficult; if all the outer grooves are opened, the welders need to work outside the pipeline. For underground pipelines, the underground tunnel at the lower part of the pipeline needs to leave enough Therefore, a large amount of earthwork needs to be excavated and backfilled, which increases the construction cost. Contents of the invention [0003] The invention aims to solve ...

Claims

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Application Information

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IPC IPC(8): B23K33/00B23K9/16B23K9/235
Inventor 江园春彭福泉姚喜民曾胜军
Owner SHANGHAI BAOYE GRP CORP
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