Construction welding method for main chord pipe inside platform legs

A welding method and the technology of the main side pipe, which are applied in welding equipment, construction, manufacturing tools, etc., can solve the problems of high strength and impact toughness, easy weld defects, and low welding work efficiency, so as to improve mechanical properties, The effect of reducing weld defects and reducing welding workload

Active Publication Date: 2008-07-23
DALIAN SHIPBUILDING IND
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Among them, the total length of the rack can reach about 167 meters. Due to the large thickness of the rack and high requirements for strength and impact toughness, welding is extremely difficult, and weld defects are prone to occur; and due to the difficulty of welding, the welding work efficiency is low

Method used

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  • Construction welding method for main chord pipe inside platform legs
  • Construction welding method for main chord pipe inside platform legs
  • Construction welding method for main chord pipe inside platform legs

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Embodiment Construction

[0019] The pile leg structure related to the present invention is mainly used in a jack-up drilling platform with a water depth of 400 feet. The structure of its main side tube is shown in Figure 9, including a semicircular plate 2 and a rack plate 1. Referring to FIG. 1 , the main side tube is connected by a plurality of connecting sections, wherein each connecting section includes a rack plate 1 arranged in the middle and semicircular plates 2 symmetrically arranged on both sides of the rack plate 1 .

[0020] With reference to Fig. 2-8, illustrate welding method of the present invention, comprises the steps:

[0021] a. The semicircular plate 2 on both sides and the rack plate 1 are welded together in the joint form of a single-sided U-shaped groove, and the semicircular plate 2 is located in the middle of the rack plate 1 and is shorter than the rack plate 1; At the welding place between the plate 2 and the rack plate 1 , the root of the semicircular plate 2 is provided w...

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Abstract

The invention discloses a construction welding method for a major side pipe in a pile leg, comprising a plurality of connecting sections composed of a plurality of semicircle plates and rack plates. The welding procedure is described as follows: a. the two side semicircle plates are welded with the rack plate into the form of a unilateral U-shaped groove joint, with the semicircle plate positioned in the middle of the rack plate and shorter than the rack plate; b. the terminals of the two sections of rack plate are welded into the form of an unsymmetrical X groove joint; c. a filling semicircle plate is filled in between two connecting sections of semicircle plates in the form of a V-shaped groove joint through welding. The construction welding method for a major side pipe in a pile leg has the advantages that the accessibility of the welding construction is enhanced while the welding joint is reduced; workload is decreased while work efficiency is enhanced and mechanical properties of the welding joint are improved. After welding procedure evaluating test, every index of the mechanical properties of the welding joint meets the requirements of a classification society.

Description

technical field [0001] The invention relates to a welding process, more specifically, to a welding process for local components in a large leg structure. Background technique [0002] Large jack-up platforms are mainly used for exploration and exploitation of offshore oil / natural gas resources, generally about 70 meters long, 76 meters wide, about 9.5 meters deep, with a structural weight of 17,000 tons, and an average operating water depth of 122 meters. The main body of the platform is all supported by pile legs, and its reliability is related to the safety of the entire platform. The shape of the pile leg is triangular truss type. There are main side pipes with racks at the three corners of the pile leg structure, which are connected by support pipes, as shown in Figure 5, including two opposite semicircular pipes (or semicircular pipes). The plate) 2 and the part 1 with the rack are composed of three racks connected by structural pipes (tube trusses) to form a triangula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02B17/00B23K33/00B23K31/00
Inventor 于训达陈绍全于立新王淑梅杨岳山朱洪宇
Owner DALIAN SHIPBUILDING IND
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