Construction method for driving pre-stressed hollow pile into thick-layer soft soil

Abstract

The invention discloses a construction method for driving a pre-stressed hollow pile into thick-layer soft soil, and belongs to the technical field of civil engineering pile driving. The construction method comprises the following steps: drilling a dewatering well on the edge of a pile site area; while the dewatering well is drilled, drilling and arranging water draining boards at the periphery of the pile site and other vacant positions according to rectangular arrangement; and implementing the pile driving after the water draining boards are drilled and arranged for 20-30 days by adopting an intermittent driving method and a skid driving method. The construction method disclosed by the invention has the advantages that: due to the adoption of two technologies, namely the dewatering well and the water draining boards, the pore water pressure in the soft soil can be effectively reduced and the foundation is consolidated. According to the intermittent driving method and the skid driving method, two paths for diffusing the pore water pressure are opened up, and thus the stability of driving the pre-stressed hollow pile into the thick-layer soft soil is fully ensured and the requirements for the construction quality and a bearing force can be met.

Description

technical field [0001] The invention relates to a construction method for driving a prestressed hollow pile into thick soft soil, and belongs to the technical field of civil engineering piling. Background technique [0002] The thick layer of soft soil refers to fine-grained soil with a natural void ratio e≥1.0 and a natural water content greater than the liquid limit. This type of soil includes silt, silty soil, peat, and peaty soil. The general thickness of the soil layer is ≥ 5m. [0003] Studies have shown that when piling in thick soft soil, due to the low permeability of saturated soft clay, the excess pore water pressure generated cannot be dissipated in time. If the design and construction are improper, there will be an obvious soil squeezing effect, resulting in the ground Uplift, upwelling, skewing and even fracture of the pile, thereby reducing the bearing capacity of the pile, and sometimes damaging adjacent buildings; after the construction of the pile foundati...

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Problems solved by technology

[0003] Studies have shown that when piling in thick soft soil, due to the low permeability of saturated soft clay, the excess pore water pressure generated cannot be dissipated in time. If the design and construction are improper, there will be an obvious soil squeezing effect, resulting in the ground Uplift, upwelling, skewing and even fracture of the pile, thereby reducing the bearing capacity of the pile, and sometimes damaging adjacent buildings; after the construction of the pile foundation, the pore water pressure in the saturated soft soil may also dissipate, and the soil layer may re-consolidate and settle. Make the pile produce negative friction resistance, reduce the bearing capacity of the pile foundation, and increase the settlement of the pile foundation

Therefore, if there is no corresponding engineering countermeasure, it will seriously limit the application of pipe pile foundation with great technical advantages

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