Super-long steel pipe pile under marine deep mucky soil condition and construction method thereof

Abstract

The invention discloses a super-long steel pipe pile under a marine deep mucky soil condition. The super-long steel pipe pile comprises a pile cap, a pile body stiffening section, an extension section and a pile tip, wherein the pile body stiffening section is connected with the pile cap and the extension section, the extension section is connected with the pile tip, steel bar positioning blocks and lock catches are arranged on the outer side of the pile body stiffening section, transverse limiting grooves and longitudinal limiting grooves are formed in the inner side of the pile body stiffening section, transverse reinforcing ribs are arranged in the transverse limiting grooves, longitudinal reinforcing ribs are arranged in the longitudinal limiting grooves, and one sides of the longitudinal reinforcing ribs extends into the pile cap. The invention further discloses a construction method of the super-long steel pipe pile under the marine deep mucky soil condition. The bending rigidity of a pile body is greatly improved by welding the reinforcing ribs on the inner side of the pipe wall of the pile body stiffening section, and the construction method is particularly suitable for construction of a foundation pit supporting structure under the condition of mucky soil with slow pore water pressure dissipation and high fluidity; and the middles of lifting lugs penetrate through the pile body, two sides of the lifting lugs extend out of the outer wall, and therefore, the lifting stability and safety are improved, and potential safety hazards are reduced.

Description

technical field [0001] The invention belongs to a steel pipe pile and a construction method thereof, in particular to an ultra-long steel pipe pile under the condition of marine deep and thick muddy soil and a construction method thereof. Background technique [0002] Deep marine muddy soil is a typical soft soil, mostly distributed in the southeast coastal areas of my country. The construction site in this type of area is full of silt, water, and low bearing capacity. Steel pipe piles are often used as the main enclosure structure in deep foundation pit support. Due to the extremely small permeability coefficient of muddy soil, the pore water pressure is difficult to dissipate in a short period of time. The foundation pit will be excavated during the pile sinking period or when the pore water pressure has not dissipated after the pile sinking. Improper excavation will cause silt flow. Generate lateral thrust on the pile body, causing quality problems such as broken piles a...

AI Technical Summary

Problems solved by technology

[0004] When the pile group is constructed through a thicker sand interlayer, due to the instability of the sand structure, the sand layer will become more crowded and denser when the pile sinks into this layer, and the pile sinking resistance will become larger and larger; in addition, due to the relatively low permeability coefficient of the sand layer Large, the pore water pressure generated by pile sinking dissipates rapidly, the effective stress increases, and the soil plug effect will gradually form, making pile sinking difficult

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