Large-diameter offshore wind power rock-socketed single pile excavating method

Abstract

The invention discloses a large-diameter offshore wind power rock-socketed single pile excavating method. The large-diameter offshore wind power rock-socketed single pile excavating method comprises the following steps that immersion of a pilot shaft pile casing is carried out; a petroleum drilling machine is adopted for excavating a pilot shaft through the pilot shaft pile casing; a geological drill is adopted for drilling two to three rings of main blast holes and one ring of outline blast holes, and a casing off hole is lowered down; a dedicated CO2 phase change expansion crack pipe is mounted, the interiors of the main blast holes are mounted in a segmented manner, and the interiors of the outline blast holes are continuously mounted; a blast network is connected; a rock-socketed single pile steel pile casing is lowered down; mud and weathering sand between the pilot shaft pile casing and the rock-socketed single pile steel pile casing are sucked away; the pilot shaft pile casing and a drilling casing pile are pulled out; underwater slag cleaning is carried out; and concrete is poured to form a rock-socketed single pile foundation. Pilot shaft mechanical excavating and CO2 expansion rock breaking and expanded excavating are combined, the technical problem that a 2-4mm-diameter petroleum drilling machine and a common geological drill are used for finishing excavating of an offshore rock-socketed single pile foundation with the diameter being 8 to 10 m and above can be solved, the expansion pressure generated by a CO2 phase change is controllable, the explosion impact waves and the vibration speed are small, and the method is economic and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of engineering blasting, and in particular relates to an excavation method for a large-diameter offshore wind power rock-socketed single pile. Background technique [0002] With the continuous development of social economy, people's demand for energy, especially clean energy, is increasing. Offshore wind power generation has the advantages of high wind speed, long effective power generation time, and does not occupy land. It is very suitable for large-scale development. However, my country's long coastline and abundant offshore wind energy resources provide favorable congenital conditions for offshore wind power generation. The foundations of wind turbines in offshore wind farms mainly include large-diameter rock-socketed single pile foundations, group pile rock-socketed foundations, suction cylinder foundations, and gravity foundations. Among them, large-diameter rock-socketed single pile foundations have t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a large-diameter offshore wind power rock-socketed single pile excavation method, which can be used in the underwater pile foundation excavation construction of offshore wind farms, sea-crossing bridges and other projects to effectively solve the problem of large-scale construction of offshore wind farms. Diameter offshore rock-socketed single pile foundation excavation technical problems to improve construction efficiency

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