Large-diameter rock-socketed single pile grouting construction method for offshore wind power

Abstract

The invention discloses a large-diameter rock-socketed single pile grouting construction method for offshore wind power, and belongs to the technical field of offshore wind power foundation grouting.The construction method is used for grouting construction of large-diameter rock-socketed single piles in offshore wind power plant construction, solves the problems about bottom sealing and side wallgrouting in the grouting construction process, and overcomes the technical defects of a common grouting method. The problem about bottom sealing caused by large-diameter single piles is solved through bottom sealing with a grouting material. The problem of non-uniform distribution of a grouting material of a large-diameter steel pipe pile is solved through uniform distribution of prefabricated grouting pipes in the steel pipe pile. By means of the application of an emergent grouting pipe, the risk of grouting is greatly reduced. Through the coordinated actions of lifting of a steel casing andgrouting, the phenomenon of aging adhesion of the steel casing and the grouting material is avoided, the steel casing can be reused, the cost of offshore wind power infrastructure is reduced, and thesafety of offshore wind power foundation construction is improved.

Description

technical field [0001] The invention relates to a large-diameter rock-socketed single pile grouting construction method for offshore wind power, which belongs to the technical field of offshore wind power foundation grouting. Background technique [0002] In the process of offshore wind power development, some sites have complex geological conditions, the shallow surface layer is a soft overburden layer, and the layer below the overburden layer is a hard rock layer. If the pile foundation of the large-diameter single-pile foundation is only driven into the surface covering soil, the bearing capacity provided by the pile foundation cannot meet the demand. In order to meet the design requirements of the bearing capacity, the pile tip of the large-diameter single-pile foundation needs to be embedded in the rock layer under the covering soil layer. Form rock-socketed piles. [0003] The rock-socketed pile is constructed by drilling and sinking piles. The diameter of the pile ho...

AI Technical Summary

Problems solved by technology

The particularity of rock-socketed single pile construction has brought a series of technical problems to the grouting operation: (1) The grouting of the rock-socketed single pile is completed underwater, the grouting gap is small, and underwater monitoring is difficult; (2) The diameter of the single pile is up to The cost of using a rubber ring or steel plate back cover is high, the method is complicated, and the effect is difficult to guarantee. During the installation process, once there is a bump, it is easy to cause failure. If the bottom cover fails, the grouting material will flow into the pile. (3) During the drilling and excavation process, the steel casing needs to be lowered to ensure that the soft soil on the upper surface covering layer will not collapse during the drilling process. During the side wall grouting, the steel casing needs to be lifted in coordination and the progress between the grouting operation, if the steel casing is lifted too fast, the soft soil on the upper surface layer will be disturbed, which may easily cause the borehole to collapse. If the steel casing is lifted too slowly, the grouting material will condense, and the steel casing and the The pipe piles are bonded together, and the steel casing is difficult to pull out, which will cause engineering accidents; (4) The length of the grouting section of the rock-socketed single pile is tens of meters, and the grouting volume is large.

Images