Device for eliminating pile foundation negative frictional resistance of soft soil foundation and construction method

Abstract

The invention discloses a device for eliminating the pile foundation negative frictional resistance of a soft soil foundation and a construction method. The device and the construction method can be widely applied to pile foundation construction of expressway interchange regions and cross road overpass bridges at soft foundation sections. The device comprises a pile foundation formed in the soft soil foundation in a pouring mode and a resistance reducer arranged outside the pile foundation. The resistance reducer is composed of an inner cylinder, an outer cylinder, a middle piece, a cover plate, a rubber sealing ring, lubricating grease, an air bag, an air inflation tube, a lifting hook and the like. The device is simple in overall structure, easy to manufacture and wide in application range. When post-construction settlement of the soft soil foundation on the periphery of the pile foundation happens at the operation stage of the device, through relative motion, without frictional resistance, between the inner cylinder and the outer cylinder, the pile foundation neither moves downwards nor prevents synchronous post-construction settlement of soft soil and a road surface on the periphery of the pile foundation, and therefore road surface protrusions caused by the negative frictional resistance can be eliminated. By means of the device combined with the construction method, problems existing in road traffic engineering for a long term are solved. The device and the construction method further have the advantages of saving resources, increasing economic and social benefits, being beneficial for traffic operation safety and the like.

Description

technical field [0001] The invention relates to a device and a construction method for eliminating the frictional resistance of pile foundations in soft soil foundations, in particular to a device and a construction method for eliminating negative frictional resistances of pile foundations caused by settlement of soft soil foundations. Background technique [0002] The distribution of soft soil foundations is very extensive, and the project processing costs are huge. The settlement of soft soil foundations is difficult to predict and control, which brings great difficulties to engineering construction. Common soft soil foundation settlement is divided into settlement during the construction period and settlement after the operation period. The settlement time during the construction period is long, the construction period is long, and the investment increases; the settlement after construction is large, and the investment in project operation and maintenance is large, which i...

AI Technical Summary

Problems solved by technology

Therefore, in order to reduce the frictional resistance of pile foundations in soft soil foundations, the bored piles are usually constructed after the soft foundations have settled to a certain standard. Chinese patent No. 200910130401.8 "Elimination of Negative Effects of Soil Squeeze Barrier and Construction of Pile Construction Method" can solve the negative friction resistance of pile foundations during the construction period, but it cannot solve the negative friction resistance of pile foundations caused by post-construction settlement during the operation period

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