Construction process of pile-first-method sleeving type jacket of offshore wind power booster station

Abstract

The invention discloses a construction process of a pile-first-method sleeving type jacket of an offshore wind power booster station. The construction process comprises the following steps of positioning a pile stabilizing construction platform, inserting and driving auxiliary piles, fixing the pile stabilizing construction platform, sinking steel pipe piles, carrying out steel pipe pile rock-socketed construction, dismounting the pile stabilizing construction platform, mounting the jacket, carrying out jacket grouting, carrying out foundation anti-scouring protection and connecting a boosterstation platform and the jacket, when the pile stabilizing construction platform is positioned, the pile stabilizing construction platform and the auxiliary piles are transported to a construction site through a transport barge, the pile stabilizing construction platform passes through the barge to a platform positioning ship to be leveled, when the auxiliary piles are inserted and driven, a craneship is matched with a vibratory hammer for construction, when the pile stabilizing construction platform is fixed, the pile stabilizing construction platform and the four auxiliary piles are temporarily welded and fixed, and when the jacket is mounted, a cross-shaped portal frame arranged at the top of each pile leg sleeve in advance is placed at the top of the corresponding steel pipe pile. According to the construction process, the construction efficiency can be effectively improved, the construction quality is ensured, and the offshore construction period is shortened.

Description

technical field [0001] The invention relates to a construction technique of an outer jacket jacket type jacket of an offshore wind power booster station. Background technique [0002] With the rapid development of my country's offshore wind power industry, offshore wind resources have been developed one after another. At present, the offshore wind power industry is gradually developing further into the deep sea. The offshore wind power booster station converts the electricity generated by all wind turbines on the same offshore wind farm into high-voltage electricity and then transmits it to land, so the booster station is also built in the same wind farm. The foundation jackets of offshore booster stations in domestic offshore wind power projects have a variety of structural types. A large number of offshore waters with a water depth of more than ten meters adopt the "back pile method" inclined pile jacket, and several sea areas with a water depth of 30 meters use the "back ...

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Problems solved by technology

[0003] However, the "post pile method" still has the following problems: the jacket must first be manufactured and shipped to the site. The manufacture of the jacket occupies the key construction lines and increases the required construction period.

[0004] As a steel structure truss structure, the piling-first jacket foundation form has been popularized and applied successively due to its light weight, strong adaptability to seabed conditions, and stability. With the increase of water depth, the advantages of the piling-first jacket foundation form It will be more obvious, but for the "pile first method" straight pile rock-socketed pile jacket foundation type, the common problems in the existing construction technology are: the installation of the jacket has high requirements for the verticality and relative accuracy of the steel pipe piles ; The rock-socketing process affects the verticality and relative accuracy of the pile; the overall sinking of the jacket is caused by the serious erosion of the silt near the seabed surface at the bottom of the jacket before the grouting of the jacket; the leg casing of the jacket is installed to the steel pipe pile After installation, the jacket needs to be fixed on the steel pipe pile by the "knife handle method", that is, the jacket is fixed on the steel pipe pile by welding the rib plate, which not only takes a long time to weld but also is greatly affected by the weather, and the welding accuracy affects the elevation of the jacket control, and requires the cooperation of the crane ship; quality control of jacket grouting;

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