Device for reducing negative friction resistance of pile foundation in soft soil area and construction method

Abstract

The invention discloses a device for reducing negative friction resistance of a pile foundation in a soft soil area and a construction method. The device for reducing negative friction resistance of the pile foundation in the soft soil area comprises an inner sleeve, a negative friction pipe and an outer sleeve; the negative friction pipe is connected with the inner sleeve through a rubber sealingring at the bottom and peripheral cushion blocks at a certain interval; the negative friction pipe is in an inverted cone shape; and a gap between the negative friction pipe and the inner sleeve is filled with pebbles and fine sands. According to the construction method, the vertical bearing capacity of the vertical load-hearing pile foundation can be improved by utilizing the inverted cone-shaped negative friction pipe, the pile diameter of the negative friction pipe is larger than the diameter of the pile foundation, and the horizontal bearing resistance of the pile foundation can also be increased; meanwhile, the combination device of the negative friction pipe and the inner sleeve is utilized, so that the pile foundation and the negative friction pipe slide relatively, the negative friction resistance caused by settlement of oversize soils around a pile is reduced, additional load and additional settlement of the pile foundation can be effectively reduced, and problem of the uneven settlement of the pile foundation in the soft soil area is solved. The construction method is wide in application range, and has the advantages of saving resources, improving social and economic benefits, being beneficial to traffic operation safety and building safety, and the like.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a device and a construction method for reducing the negative friction resistance of pile foundations in soft soil areas, which are combined with a negative friction pipe and an inner casing. Background technique [0002] In the coastal areas, soft soil layers are widely distributed, especially in coastal tidal reclamation areas, where the soft soil layers are thicker and more compressible. In the later stage of reclamation and filling and roadbed construction, significant settlement deformation will occur, causing engineering bridges, buildings, Significant negative friction resistance of the pile foundation under the subgrade increases the vertical load of the pile foundation and reduces the safety of the pile foundation of the project. Severe cases will lead to detachment of bridge pile foundation from support, detachment of building pile foundation fr...

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Problems solved by technology

[0004] In order to solve the above problems, the present invention discloses a device and a construction method for reducing the negative friction resistance of pile foundations in soft soil areas. The vertical bearing capacity of vertically loaded pile foundations can be improved by using inverted conical negative friction pipes, and the negative friction pipes The diameter of the pile is larger than that of the pile foundation and can increase the pile foundation's horizontal bearing capacity. At the same time, the combination device of the negative friction tube and the inner casing is used to make the pile foundation and the negative friction tube slide relative to each other, reducing the load caused by the excessive settlement of the soil around the pile. Frictional resistance, which can effectively reduce the additional load and additional settlement of pile foundations, and solve the problem of uneven settlement of pile foundations in soft soil areas

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