Concrete pipe pile offshore pile sinking construction method

Abstract

The invention belongs to the technical field of offshore pile sinking, and discloses a concrete pipe pile offshore pile sinking construction method. The method comprises the steps that firstly, a grouting rotary spraying pipe for high-pressure nozzle operation and a prefabricated concrete pipe pile are vertically placed over a pile sinking position, and the concrete pipe pile is arranged outside the grouting rotary spraying pipe in a sleeving mode and clamped and fixed through a pile holding device; then, drilling and high-pressure rotary spraying operation are carried out, after the groutingrotary spraying pipe descends by a section depth, the concrete pipe pile is downwards conveyed by the same section depth through the pile holding device, and the steps are repeated until the concretepipe pile reaches the designed elevation position; then, the grouting rotary spraying pipe is upwards lifted out of the concrete pipe pile; and finally, standing and curing are carried out until the strength of cement sand meets the requirement. According to the method, the problem that the concrete pipe pile is difficult to sink due to the strong friction resistance of the sand in the high-stressstate to the pile wall can be effectively solved, the connection strength of the sand and the pile interface can be effectively improved, the effective pile diameter of the concrete pipe pile is enlarged, the bearing capacity is improved, one-time construction of offshore pile sinking can be realized, and the construction period is saved.

Description

technical field [0001] The invention belongs to the technical field of offshore pile sinking, and in particular relates to a construction method for concrete pipe pile pile sinking at sea, which is especially suitable for the relatively dense sandy soil environment below the sea surface. Background technique [0002] To carry out platform operations at sea, it is necessary to drive the platform foundation into the soil below the seawater. Compared with land construction, there is seawater pressure above the soil layer of offshore pile foundations, which makes the soil denser and has a stronger stress field, so it is more difficult to sink concrete pipe piles at sea. The surface of sandy soil is rough, and under high stress field, great frictional resistance will be generated in the process of sinking prefabricated piles, so this problem is more obvious in sandy soil layer. Therefore, steel piles are generally used for offshore pile foundations, which can minimize the fricti...

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Problems solved by technology

[0004] The present invention focuses on solving the technical problem that the foundation soil of offshore concrete pipe piles is below sea water, especially the difficulty of sinking piles in sandy soil, and provides a construction method for offshore concrete pipe piles, which applies high-pressure rotary jetting technology to offshore concrete During the construction of pipe piles, the impact force of the jet grout is used to loosen the soil, and the soil particles are wrapped with cement slurry to reduce the roughness of the soil surface, thereby reducing the penetration resistance of concrete pipe piles

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