Construction method for offshore wind power pile foundation protection, ballast die bed positioning and underwater sand blowing bag soil fixation

Abstract

The invention provides a construction method. The construction method comprises the following steps that (1) sand blowing bags are loaded on a laying ship by a traffic ship, a working ship is dragged by an anchoring ship to a site for positioning and anchoring positioning, a sand transporting ship sucks and loads sand at a specified position and transports the sand to the laying ship for barging, and two 6-inch slurry pumps are hoisted into a sand blowing cabin by the working ship; (2) a worker on the laying ship binds the folded sand blowing bags to a ballast die bed through a polypropylene nylon rope and an adjustable rope in a buckling manner, the laying work ship sinks the sand blowing bags into a washed foundation pit at the pile root of a pile foundation through a crane, the sand bags are tightly attached to the seabed plane at the bottom of the bottom pit, cuffs are exposed out of the sea water surface, and sand conveying pipes of the slurry pumps directly stretch into the cuffs to be tightened; (3) sand blowing is started; and (4) the ballast die bed is hung on the working ship, and the sand blowing bags are bound continuously. The construction method for offshore wind power pile foundation protection, ballast die bed positioning and underwater sand blowing bag soil fixation is invented, the problem that a positioning method in deep water cannot be solved for many years is solved, and the effect is very good.

Description

technical field [0001] The invention relates to the technical field of anti-scouring of offshore wind power pile foundations, and more specifically relates to offshore wind power pile foundation protection, ballast mold bed positioning, and underwater sand blowing bag soil consolidation construction methods. Background technique [0002] The offshore wind power pile foundation will change the original hydrodynamic conditions such as waves and currents in the area, breaking the established sediment transport balance, so that the pile foundation [0003] Scouring of the surrounding seafloor occurs. When the sea current encounters the obstruction of the pile, it will flow around, and the flow velocity around the pile will increase. The horseshoe-shaped vortex formed around the pile and the denudation vortex behind the pile are the main driving forces for the erosion of the pile foundation. The horseshoe-shaped vortex is formed because the water flow is hindered and rotated. W...

AI Technical Summary

Problems solved by technology

[0005] For example, riprap protection piles, because the stones are thrown into the pile foundation pit, the gaps between the stones still cannot prevent the tidal pumping to take away the sand below, causing the stones to sink. Because the stones have edges and corners, they sink behind the cable, and the cable is absorbed by the tide. The cable was damaged due to evacuation and drifting. After a year of scanning, it was found that the rocks were sinking and the foundation pit was still growing. The anti-scouring effect was not good, and the cost was high.

[0006] For example, sand blowing bag throwing filling, but when the underwater sand bag construction depth is greater than 2m, it is greatly affected by wind, waves, and tides, and the controllability of the construction operation is poor, and the flatness of the mud surface of the scour pit is poor , it is difficult to monitor the settlement change of the sand-filled bag, which makes the surface flatness of the sand-filled bag poor, and the underwater filling is easy to form "empty corners"

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