On-sea sandwich steel pipe pile foundation and construction method

Abstract

The invention discloses an on-sea sandwich steel pipe pile foundation and a construction method. The on-sea sandwich steel pipe pile foundation comprises an outer steel pipe (11) and an inner steel pipe (12), the inner steel pipe (12) is arranged in the outer steel pipe (11), an annular space is formed between the inner steel pipe (12) and the outer steel pipe (11), and reinforced concrete (13) is cast and formed in the annular space. Through organic combination of a steel structure and a reinforced concrete structure, the section modulus and the structural rigidity of a single-pile structure are obviously increased, and the defects that in the use period, the single-pile structure is too large in deformation and not suitable for the large water depth are overcome. The sandwich steel pipe pile foundation can effectively reduce the wall thickness and the weight of an outer steel pile which is piled firstly, when the hoisting capacity is fixed, pile-sinking construction of the pipe pile of the larger diameter can be achieved, and the on-sea sandwich steel pipe pile foundation can be suitable for the engineering area with the larger water depth. The construction method of the on-sea sandwich steel pipe pile foundation is further disclosed.

Description

technical field [0001] The invention belongs to the technical field of ocean engineering foundations, and in particular relates to an offshore sandwich steel pipe pile foundation and a construction method. Background technique [0002] Due to the offshore construction, the working conditions are harsh, the construction time is short, the construction is difficult, and it is greatly affected by natural conditions such as weather and sea conditions. [0003] At present, single large-diameter steel pipe piles are one of the basic structure types commonly used in marine engineering, especially offshore wind power projects. Fast and other advantages, suitable for engineering areas with thick soft soil layers. However, the single pile foundation structure has the following disadvantages: the length of the cantilever above the mud surface is too large, the flexibility is too large and the rigidity is insufficient, the displacement and deformation during the service period are rela...

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Problems solved by technology

However, the single pile foundation structure has the following disadvantages: the length of the cantilever above the mud surface is too large, the flexibility is too large and the rigidity is insufficient, the displacement and deformation during the service period are relatively large, and it is difficult to adapt to areas with large water depths; in order to ensure sufficient rigidity and strength, The diameter of a single steel pipe pile is relatively large (generally more than 4 meters), the corresponding wall thickness is also large, and the amount of steel is large; the weight of the entire steel pipe pile is large, and large lifting equipment and large piling hammers are required. High; limited by the capacity of lifting equipment, the maximum diameter of a single steel pipe pile is also limited, and it is still difficult to use this type of foundation structure in large wind loads and deep sea areas

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