A crawler steel pipe pile with reduced negative friction resistance and its construction method

Abstract

The invention discloses a track steel-pipe pile capable of reducing negative friction force and a construction method, and belongs to the technical field of building foundation engineering. The track steel-pipe pile comprises a pile body, gear shafts, T-shaped steel beams and a rigid track. Concrete is poured into a round steel pipe to form the pile body. The middle of each gear shaft is provided with a one-way rotating gear, and the two ends of each gear shaft are provided with one-way rotating pulleys. Webs of the T-shaped steel beams are annularly welded to the outer side of the pile body at equal intervals. The gear shafts are symmetrically welded to the two sides of the webs of the T-shaped steel beams and are arranged at equal intervals in the longitudinal direction of the webs. The rigid track is composed of track shoes and track pins. The two ends of each track shoe are provided with holes, and the track shoes are connected through the corresponding track pins to form the rigid track. The rigid track is engaged with the one-way rotating gears on the gear shafts and further attached to the one-way rotating pulleys at the two ends of the gear shafts, and the rigid track can be closed through the track pins so that the track steel-pipe pile can be formed. According to the track steel-pipe pile capable of reducing negative friction force and the construction method, through one-way rotation of the rigid track, pile-soil positive friction force can be increased while the pile-soil negative friction force is reduced, insufficient bearing capacity of the pile body is prevented, and safety and stability of an upper structure are guaranteed.

Description

technical field [0001] The invention relates to building foundation engineering technology, in particular to crawler steel pipe pile technology for reducing negative frictional resistance. Background technique [0002] In recent years, the national economy has continued to develop rapidly, the speed of urbanization has accelerated, and the number of urban populations has continued to increase. The existing infrastructure can no longer meet people's production and living needs. A major challenge faced by large and medium-sized cities, a large number of high-rise and super high-rise buildings have emerged in large and medium-sized cities. As a form of foundation for high-rise and super high-rise buildings, pile foundation is accepted by the engineering community because of its high bearing capacity and can effectively reduce the uneven settlement of superstructures, and is widely used in engineering practice. However, in the actual application of the pile foundation in the co...

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Problems solved by technology

However, in the actual application of the pile foundation in the collapsible loess area and soft soil area, the bearing capacity of the pile body becomes weak, and the superstructure settles unevenly. It is found through research that it is caused by the negative friction resistance generated by the settlement of the soil around the pile. To solve this problem, existing pile foundations in collapsible loess areas and soft soil areas often use pile body coating and casing methods to reduce the negative frictional resistance of the pile body caused by the settlement of the surrounding soil, but the pile body coating The materials used in the coating method belong to harmful chemical components, which will pollute the surrounding soil and water quality; in addition, the existing methods of reducing negative friction resistance such as coating method and casing method only focus on how to reduce negative friction resistance. When the pile body is under load, the positive frictional resistance of the soil to the pile body is ignored, and the bearing capacity of the pile foundation is reduced.

[0003] To sum up, the existing methods for reducing negative friction only emphasize the effective reduction of negative friction, while ignoring its influence on the positive friction between piles and soil, which reduces the bearing capacity of piles.

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