Method for righting jacket by using single cantilever gin pole and double hooks

A technology for jackets and poles, which is applied in construction and infrastructure engineering, etc., can solve the problems of increased jacket weight, increased project cost, increased expense and construction period, etc., to reduce installation weight, reduce requirements, and reduce project costs Effect

Active Publication Date: 2013-01-02
CHINA NAT OFFSHORE OIL CORP +1
5 Cites 13 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0003] Both of the above two methods require the jacket to be self-floating when it first enters the water. This requires the design of the jacket not only to meet the strength requirements, but also to meet the buoyancy requirements during the installation stage. Some jackets need to add additional buoys to meet the self-floating state. buoyancy requiremen...
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Method used

(3) drive tugboat 9,9 ' to do circular motion in the same direction, the steel wire rope 91 between jacket 8 top tugboat 9 tail winches and jacket 8 keeps tension state, plays a leading role and draws jack...
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Abstract

The invention provides a method for righting a jacket by using a single cantilever gin pole and double hooks, which utilizes a single cantilever gin pole of a floating crane ship to finish the righting operation of the jacket. The method comprises the fives steps that a transport barge laterally stops at the tail part of the floating crane ship, and a lifting rigging and a righting rigging are connected; a main hook of the floating crane ship is used to lift a jacket, and the transport barge is dragged away from the floating crane ship; the main hook of the floating crane ship is lowered so that a part of the jacket is immersed into sea water; a gin pole of the floating crane ship is lowered to a predetermined angle, and the jacket is rotated to the position parallel to the gin pole of the floating crane ship by using a tug boat; and righting of the jacket is finished by lowering the main hook of the floating crane ship and raising an auxiliary hook of the floating crane ship. According to the method, the single cantilever gin pole is utilized to finish the lifting and righting of large-sized jackets, the marine construction period can be shortened, the requirement for reserve buoyancy by the jacket is lowered, the mounting weight of the jacket is reduced, and the engineering cost is greatly reduced.

Application Domain

Technology Topic

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  • Method for righting jacket by using single cantilever gin pole and double hooks
  • Method for righting jacket by using single cantilever gin pole and double hooks
  • Method for righting jacket by using single cantilever gin pole and double hooks

Examples

  • Experimental program(1)

Example Embodiment

[0035] Examples:
[0036] The first step, such as figure 1 Shown: the transport barge 7 is leaning against the stern of the floating crane 1, connect one end of the two lifting riggings 5 ​​to the main hook 3 of the floating crane 1, and the other end to the main lifting point of the jacket 8; One end of the centralizing rigging 6 is connected with the auxiliary hook 4 of the floating crane 1, and the other end is connected with the centralizing lifting point of the jacket 8;
[0037] The second step, such as figure 2 Shown: use the main hook 3 of the floating crane 1 to hoist the jacket 8 and drag the transport barge 7 away from the floating crane 1;
[0038] The third step, such as image 3 Shown: Lower the main hook 3, so that the jacket 8 is partially submerged in seawater;
[0039] The fourth step, such as Figure 4 , Figure 5 As shown, first lower the floating crane 1 pole 2 to a predetermined angle, and use the tug 9 to rotate the jacket 8 to a position parallel to the floating crane 1 pole 2. The specific steps are:
[0040] (1) First, the jacket part is submerged for 8 minutes to reduce the hook force on the main hook 3 of the floating crane 1;
[0041] (2) Set up two tugs 9, 9', and use wire ropes to connect the tail winches of the two tugs 9, 9'to the bottom and top positions of the jacket 8 respectively;
[0042] (3) Drive the tugs 9 and 9'to make circular motions in the same direction. The wire rope 91 between the winch at the top of the jacket 8 and the tail of the tug 9 and the jacket 8 is kept in tension, and plays a leading role in pulling the jacket 8 to rotate; the bottom of the jacket The wire rope 91' between the tail winch of the tug 9'and the jacket 8 maintains a certain tension to ensure the stability of the jacket 9 during rotation;
[0043] (4) While the jacket 9 is rotating, the mast 2 of the floating crane 1 should be lowered gradually to keep a sufficient gap between the jacket 8 and the floating crane 1. Generally, the gap should be controlled between 1m and 2m. To avoid collision between jacket 8 and floating crane 1;
[0044] (5) Such as Figure 6 to Figure 9 As shown, the centering operation of the jacket 8 is gradually completed by lowering the main hook 3 and lifting the auxiliary hook 4.
[0045] Such as Image 6 As shown, the main hook 3 and the auxiliary hook 4 are stressed at the same time, and the righting operation is started.
[0046] Such as Figure 7 As shown, the main hook 3 and the auxiliary lifting hook 4 are lowered, and the jacket moves from the state parallel to the sea level A to the direction perpendicular to the sea level A.
[0047] Such as Figure 8 As shown, continue to lower the main hook 3 and raise the auxiliary hook 4, and the jacket continues to move in the direction A perpendicular to the sea level.
[0048] Such as Picture 9 As shown, the main hook 3 and the auxiliary lifting hook 4 are further lowered, and the jacket reaches the state of being perpendicular to the sea level A, and the righting operation is completed.
[0049] The floating crane 1, the grille 2, the main hook 3, the auxiliary hook 4, the hoisting rigging 5, the centralizing rigging 6, the transport barge 7, the jacket 8 and the tug 9 are all commercially available products, and can also be manufactured using existing technology .
[0050] The content not described in this embodiment is the prior art, so it will not be repeated.
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