Prestressed self-locking anchor bolt reinforced variable-diameter single-pile fan foundation under offshore rock foundation condition and construction method thereof

Abstract

The invention discloses a prestressed self-locking anchor bolt reinforced variable-diameter single-pile fan foundation under an offshore rock foundation condition and a construction method of the prestressed self-locking anchor bolt reinforced variable-diameter single-pile fan foundation under the offshore rock foundation condition. The foundation comprises a variable-diameter single-pile foundation body (1) and prestressed casing self-locking head anchor bolts (2); the variable-diameter single-pile foundation body (1) comprises an underwater variable-diameter section steel cylinder (3) and a buried section straight cylinder (4), the top of the underwater variable-diameter section steel cylinder (3) is connected with an upper tower cylinder (5), and an inner boot beam (6) and an outer boot beam (7) are welded to the inner wall and the outer wall of the buried section straight cylinder (4); steel casings (8) penetrate the outer boot beam (7) and are welded to the outer wall of the buried section straight cylinder (4); and the prestressed casing self-locking head anchor bolts (2) penetrate the steel casings (8), the lower ends of the prestressed casing self-locking head anchor bolts (2) are anchored into rock, and the upper ends of the prestressed casing self-locking head anchor bolts (2) are fixed to the top faces of the steel casings (8) through press joints (9). According to the prestressed self-locking anchor bolt reinforced variable-diameter single-pile fan foundation under the offshore rock foundation condition, the designed variable-diameter single-pile foundation body can be matched with the stress of the different heights of the variable-diameter single-pile foundation body, the structure is more efficient and economical, and the fatigue resistance and the durability are high.

Description

Technical field [0001] The invention belongs to the technical field of offshore wind power tower foundations, and specifically relates to a prestressed self-locking anchor reinforced variable-diameter single-pile wind turbine foundation under the condition of the offshore rock foundation and a construction method thereof. Background technique [0002] In recent years, with the vigorous development of my country's wind power industry, the number of excellent sites to be developed on land has gradually decreased, and the construction of wind farms is shifting to the sea. The load environment of offshore wind turbines is special and complex, and most of the existing foundation forms have problems such as difficulty in construction and high cost. Therefore, it is necessary to research and develop the basic form of offshore wind turbine with low cost and easy construction. At present, wind turbines under offshore rock foundation conditions mostly use single pile foundation, which has...

AI Technical Summary

Problems solved by technology

[0003] ① The distribution of rock formations at different machine positions is very different, and there are uncertainties in the design and manufacture of pile lengths;

[0004] ② It is difficult to drive large-diameter single piles on rock foundations, and there is uncertainty in the possible depth of pile sinking;

[0005] ③The existing "intermediate drilling porous anchor pile method" for strengthening the anchorage between the bottom of the single pile and the rock can only play the role of strengthening the shear resistance of the bottom of the pile, and it is difficult to play the role of transmitting the flexural bearing capacity between the pile and the rock

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