Construction method for recovery of offshore wind-power bucket foundation

Abstract

The invention belongs to the technical field of recovery of offshore wind-power foundations, and discloses a construction method for recovery of an offshore wind-power bucket foundation. The construction method for recovery of the offshore wind-power bucket foundation comprises a water-injection jacking stage, an inflation jacking stage, a mooring rope-assisted up-pulling stage and a self-floatingstabilization stage. Specifically, water is injected into a steel cylinder through a drain pipe at first to make the bucket foundation move vertically, a mooring rope is used for assisting the bucketfoundation in rising, water injection is stopped when the bucket foundation rises to a certain height, the steel cylinder is inflated through the drain pipe till the bucket foundation moves upwards,and the up-pulling force of the mooring rope is adjusted to guarantee constant-speed rising of the bucket foundation; and when a top cover of the steel cylinder reaches the water surface, the steel cylinder continues to be inflated till the up-pulling force of the mooring rope is decreased to zero, and then the bucket foundation floats automatically to rise so as to be recovered. According to theconstruction method for recovery of the offshore wind-power bucket foundation, water-injection jacking is adopted at the early stage, so that the soil around the whole bucket foundation is sheared tobe damaged, and accordingly, the jacking resistance is reduced; then water-injection and inflation jacking is adopted, so that large construction equipment is not used; and the construction economicalefficiency is good, and the construction period is short.

Description

technical field [0001] The invention belongs to the technical field of recovery of offshore wind power foundations, and in particular relates to a construction method for recycling foundations of offshore wind power cylinders. Background technique [0002] With the development of economy and social progress, people's awareness of environmental protection is increasing day by day. At the same time, the depletion of traditional energy forces the development of energy to renewable energy. Offshore wind power is developing rapidly. With the upgrading of offshore wind power generators and wind power At the end of the service of the wind farm, the dismantling and construction of the offshore wind farm and the cost of the dismantling work have attracted more and more attention. In 2017, DONG ENERGY will dismantle 11 wind turbines of the Vindeby offshore wind farm that have been in operation for more than 25 years. The decommissioning of the world's first offshore wind farm requires...

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Problems solved by technology

[0003] The barrel foundation is a low-cost, easy-to-construct and reusable wind power foundation. In 2015, the Danish wind farm Horns Rev 2 demolished the barrel foundation, but the relevant specific construction methods have not been made public.

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