Large-diameter pile foundation scouring preventing method and device in which active protection and passive protection are combined

Abstract

The invention discloses a large-diameter pile foundation scouring preventing method and device in which active protection and passive protection are combined. The method mainly includes the steps thata grouting device is arranged, a grouting pipe is fixed to a pile body in a helix shape, a grout extracting device is arranged on the edge of a pile foundation scouring preventing to-be-reinforced region, the grouting device is used for pressure grouting, meanwhile, the grout extracting device is used for extracting grout, and grouting is based on the MICP technology; and firstly, pH7-8 bacilluspasteurii liquid is injected, then a calcium chloride solution is injected, finally, a mixed solution of urea and calcium chloride is injected, after the operation is completed, the roles of the grouting device and the grout extracting device are exchanged, the grouting and grout extracting process is executed again, and the operation can be repeated. By means of the method, impact of water currents can be reduced, horseshoe-shaped vortexes are reduced, scouring of the water currents to a sea bed is weakened, meanwhile, a hard shell course can be formed on the surface of the sea bed, and the scouring preventing capacity of the sea bed is greatly improved. The large-diameter pile foundation scouring preventing method and device have the multiple beneficial effects that disturbance of soil mass is low, construction is convenient, reutilization is achieved, and the general applicability is good, and have broad application prospects.

Description

technical field [0001] The invention relates to a large-diameter pile foundation anti-scouring method and device, in particular to a large-diameter pile foundation anti-scouring method and device based on the combination of active and passive protection based on MICP technology, which belongs to the field of biotechnology fixed buildings. Background technique [0002] The use of offshore pile foundations is increasing day by day. In view of the problem of anti-scouring in sandy seabeds, the current anti-scouring measures for pile foundations mainly include the sacrificial pile method in front of the pile, the retaining ring, the shell method, the pile body slit method, the downstream stone slab method, Stone riprap method, enlarged foundation method, grouting method etc., but existing method all has very big deficiency. The sacrificial pile method in front of the pile and the downstream stone slab method play a reduced or even zero role when the water flow direction changes;...

AI Technical Summary

Problems solved by technology

The sacrificial pile method in front of the pile and the downstream stone slab method play a reduced or even zero role when the water flow direction changes; the position of the retaining ring and shell method is prone to change when the seabed changes, and the post-maintenance Difficulty; the gaps in the pile body are easily blocked by foreign objects in the method of opening the pile body, and lose the function of weakening the water flow; the integrity of the riprap method is poor, and the maintenance cost and workload in the later stage are large; the seabed surface changes in the method of expanding the pile foundation It is difficult to exert its anti-scouring effect; the grouting method has a great impact on the environment and is not conducive to the survival of marine organisms

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