Overwater replacing method of structure of stay tube

A technology for pipe structures and components, which is applied in the field of water dismantling and replacement of support pipe structures, can solve the problems of long occupancy docking period and inability to guarantee the replacement accuracy of support pipes, so as to reduce costs, reduce costs, and save labor and flexibility in replacement construction operations. The effect of structural deformation and even instability

CN101708764BActive Publication Date: 2012-07-04DALIAN SHIPBUILDING IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-07-04

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Abstract

The invention discloses an overwater replacing method of a structure of a stay tube, which is mainly used for replacing the stay tube in a semisubmersible drilling platform. The method comprises the steps of: 1. preparing a tool component for construction; 2. fixing the tool component on a slanting stay tube with cushion plates at two ends; 3. cutting the segment of the stay tube positioned between the cushion plates at two ends; 4. positioning a new replaced pipe at the cut pipe segment, and welding and fixing to form into a new slanting stay tube; and 5. repeating the steps of S2-S4, replacing all slanting stay tubes which form into the drilling platform one by one, and sequentially replacing all horizontal stay tubes which form into the drilling platform one by one. The method can prevent the structure of the platform from deforming and even unbalancing, leads the replacing construction of the stay tubes to be labor-saving and flexible, is convenient and simple, improves the replacing efficiency of the stay tubes, and reduces the cost. The method moves dry docking work onto water surface, thereby shortening the dry docking period, improving the production efficiency, and guaranteeing the replacing precision of the stay tube.
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Description

technical field

[0001] The invention relates to a construction method in marine engineering, more specifically, it relates to a process method for dismantling and replacing a supporting pipe structure on water. Background technique

[0002] At present, there are 178 semi-submersible drilling platforms in the world. Most of these platforms were built in the 1980s. By 2010, the service life of 90% of the platforms will exceed 25 years. In order to extend the service life of the platforms, many ship owners Partial transformation and partial renewal are carried out on these platforms. Therefore, the number of renewals of offshore platforms is very large, and the market is very broad. Under the existing technical methods, on marine engineering products, especially the old structural transformation work of large multi-support tube semi-submersible platforms, the removal and replacement of large-scale support tubes is generally carried out in the dock, which requires the use of res...

Examples

Embodiment Construction

[0022] The method of the present invention mainly includes the general process regulations for removing and replacing the support pipe on the water surface, and its specific content is as follows:

[0023] 1. First remove and replace the support tubes that have less influence on the platform deformation, and finally remove and replace the support tubes that have a greater influence on the platform deformation;

[0024] 2. Before the original pipe is cut, in order to prevent the structural deformation of the support pipe, the temporary reinforcement support pipe must be installed in advance, and the new support pipe must be replaced and welded before the temporary reinforcement support pipe can be removed;

[0025] 3. The removal and installation of the switching support tubes on the water surface is carried out by hanging the pulley block as the main method and the chain hoist as the auxiliary method. The removal and the transportation of the new support tubes need to be carrie...