Single pile foundation at sea with cement mixing pile reinforced foundations

Abstract

The invention belongs to single pile foundation at sea with cement mixing pile reinforced foundations of the field of pile foundation of ocean engineering. According to the technical scheme, a steel pipe pile is sunk into soft soil foundations of a seabed, in the soft soil foundations, the reinforce foundations formed by a underwater deep-layer cement mixing method are arranged around the steel pipe pile, and the reinforced foundations is a rotary body coaxial with the steel pipe pile; and the reinforced foundations comprise cement mixing pipes and soft soil between the cement mixing pipes. According to the single pile foundation, the horizontal bearing capacity is high, horizontal displacement of a pile top is small, an inclination angle of a pile body is small, rigidity of foundation islarge, and the single pile foundation is applied to the characteristic of large horizontal load of an offshore wind turbine, the strict requirements of the offshore wind turbine to the foundation horizontal displacement and the inclination angle of the pile body are met, and the requirement of overall natural vibration frequency of 'structure and foundation' is met.

Description

technical field [0001] The invention relates to the field of pile foundations of marine engineering, in particular to an offshore single pile foundation with high horizontal bearing capacity in soft soil foundations. Background technique [0002] Offshore wind power generation is the focus of development in the field of new energy, and the market prospect is very broad. The fan unit has strict control standards for the horizontal displacement and uneven settlement of the foundation, and the natural vibration frequency of the "structure + foundation" needs to avoid the driving frequency of the external load. At present, the common foundation types of offshore wind turbines include single pile, high pile cap, multi-pod, jacket type, gravity type, negative pressure bucket and floating platform structure, etc. In offshore wind power projects, monopile foundations are widely used because of their advantages such as small footprint, simple structure, quick construction, and low c...

AI Technical Summary

Problems solved by technology

Although steel pipe piles have relatively high bending stiffness, the soil on the foundation surface around the piles can provide limited horizontal constraints.

If a conventional single pile foundation is adopted, increasing the pile diameter, pile length or wall thickness will lead to more material consumption, and the increase in the weight of the single pile will also bring higher construction difficulty, which will increase the foundation cost rapidly and affect the wind farm. power generation benefit

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