A Method of Connecting Pile Legs Using 3000t Floating Crane

Abstract

The invention discloses a method for carrying out pile leg connection by utilizing a 3000t floating crane. The method comprises the following steps: carrying out water drilling on a pile below an offshore self-elevating type drilling platform, and pre-joining two truss type pile leg sections on a slipway to form a total section (with height being about 70 cm, triangle edge length being 13 m, and total height being about 550 t); then, assembling a rope and a rig for hoisting; and finally, utilizing a secondary hook (with safety load being 750t) of the 3000t floating crane to hoist the pile leg total section to a trunk of the drilling platform from the slipway, positioning the floating crane by utilizing a tug and a rope, carrying out butt-welding on the lower end of the pile leg total section and the top end of the front pile leg section, and dismounting a hoisting tool until the total section is firmly welded. The method for carrying out pile leg connection disclosed by the invention can effectively reduce operations such as high-altitude put-up, welding, transporting and the like of pile leg connection, and is carried out at a height of about 100m from the ground; meanwhile, the hoisting times of the floating crane are halved; hoisting points are reasonably arranged, so that the pile leg total section is uniform in stress; and the method not only can guarantee the safe operation, but also can greatly reduce the production cost and can guarantee the construction quality of a pile leg.

Description

technical field [0001] The invention relates to high-altitude hoisting, positioning, assembling, welding and other operations of a large-tonnage structure in a large-scale project on a water area, and specifically relates to a method for connecting pile legs by using a 3000t floating crane. Background technique [0002] With the rise of the oil industry, many shipyards at home and abroad are competing to build jack-up drilling platforms, which are extremely expensive and have a lot of drilling and living equipment. Pile legs are an important support and lifting structure of jack-up drilling platforms. The construction quality of pile legs directly affects the safety of drilling platforms. Domestic and foreign regulations have strict requirements on the construction of pile legs, which indirectly increases the difficulty of construction. In addition, the size and weight of the pile legs are relatively large. For example, a 400-foot jack-up drilling platform has three pile leg...

AI Technical Summary

Problems solved by technology

[0004] As the legs of the jack-up drilling platform in the prior art are limited by the hoisting height and weight of the crane, it is impossible to complete the closure of all the leg segments on land, and the remaining leg segments on the upper part need to wait for the drilling platform. When the floating crane is used to close the water after launching, the more the remaining pile legs in the upper part are segmented, the more times the floating crane lifts and closes the operation, and the corresponding production cost and operation risk are greatly increased.

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