Novel process for integrally prefabricating and hoisting herringbone frame of deepwater jacket

Abstract

The invention discloses a novel process for integrally prefabricating and hoisting an inverted V-shaped frame of a deepwater jacket, which comprises the following steps of: S1, placing a plurality of cushion piers on the land, and measuring and leveling; s2, bottom horizontal pieces are laid on the leveled cushion piers, and then the bottom horizontal pieces and the cushion piers are fixed; s3, herringbone frames are fixedly installed on the two sides of the fixed bottom horizontal piece correspondingly; s4, a fixed connecting pipe is installed between the inverted-Y-shaped frames; and S5, overall hoisting is conducted on the structure. The high-altitude welding work of the herringbone frame and the bottom horizontal piece is transferred to the ground, the high-altitude hoisting frequency is reduced, the construction difficulty is lowered, the construction risk is lowered, the construction period is shortened, and the construction technology is connected with international jacket design and construction rails, so that the overseas market competitiveness is improved.

Description

technical field [0001] The invention relates to the field of offshore oil engineering, in particular to a new process for the overall prefabrication and hoisting of a deep-water jacket "herringbone" frame. Background technique [0002] With the acceleration of oil and gas development to deep water and ultra-deep water, the deep water jacket is also developing rapidly, and the construction technology of the deep water jacket is constantly improving. In the horizontal construction process of the deepwater jacket, the launching truss and the top surface of the conduit need to be connected through a "herringbone" structure to form a frame, commonly known as a "herringbone" frame. [0003] At present, domestic jacket "herringbone" frames are all prefabricated in one piece and hoisted in one piece. Due to the large size of the herringbone frame, the hoisting position is high, the hoisting is difficult, and the hoisting is easy to shake, which makes accurate positioning difficult. ...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic jacket "herringbone" frames are all prefabricated in one piece and hoisted in one piece. Due to the large size of the herringbone frame, the hoisting position is high, the hoisting is difficult, and the hoisting is easy to shake, which makes accurate positioning difficult. After hoisting in place There are still a large number of high-altitude welding operations, which are difficult to construct, have a long period, and have high safety risks, which have always been difficult problems in the construction of deepwater jackets

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