Extension body compaction pile capable of eliminating pile foundation negative friction and construction method

Abstract

The invention discloses an extension body compaction pile capable of eliminating pile foundation negative friction and a construction method, and belongs to the field of geotechnical engineering foundation treatment. The extension body compaction pile structurally comprises a pile body, an extension device, a sleeve and a bearing platform. The pile body is a concrete steel tube pile; the extension device is formed by connecting a two-way clamping hoop, a unidirectional clamping hoop, crank connecting rods, and rotating shaft pins. The crank connecting rods are connected on rotating shaft supporting seats located on the two sides of the two-way clamping hoop through the rotating shaft pins, the crank connecting rods on one side of the two-way clamping hoop are connected with the unidirectional clamping hoop, and the extension device is formed. The sleeve is a cylindrical steel drum and is connected with the crank connecting rods located on the free side of the extension device. The connected device is inserted in the pile body, the top of the sleeve is flush with the top of the pile, and the unidirectional clamping hoop is fixed with positioning bolts. The pile body is driven to a designed position through a piling machine. The reinforcement concrete bearing platform is cast on the top of the pile. Assembly of the parts of the extension body compaction pile is simple, practicability is strong, construction is convenient, safety and environmental protection are achieved, and the extension body compaction pile is particularly suitable for the foundation treatment in collapsible loess areas and soft clay areas.

Description

technical field [0001] The invention belongs to the field of geotechnical engineering foundation treatment, and in particular relates to the technology of body-expanding compaction piles for eliminating the negative friction resistance of pile foundations. Background technique [0002] In recent years, with the rapid development of the national economy and the continuous acceleration of infrastructure construction, the number of high-rise and super high-rise buildings with strict requirements on the foundation has continued to increase. Pile foundations have become an important way to deal with foundations and are widely used in various foundations. However, in actual engineering, it is found that when pile foundations are used in collapsible loess, seasonal frozen soil, soft soil and other unfavorable soil areas, problems such as uneven settlement of the foundation and insufficient bearing capacity of the foundation appear to varying degrees. Friction is the main cause of s...

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Problems solved by technology

The most common method of foundation treatment is the dynamic compaction method, but this method is not effective for highly compressive foundation soil; the interface treatment method is commonly to apply a thin layer of asphalt on the pile body, which mainly uses asphalt to slide The principle of thin layer friction coefficient is small to reduce the negative friction resistance of pile foundation, and transfer part of the pull-down load generated by soil settlement from the upper part of the pile body to the lower part of the pile body. This part of the load is still borne by the pile body and has not been eliminated in essence. Negative frictional resistance, and the effect of asphalt coating is significantly affected by factors such as temperature and time. Asphalt coatings buried underground for a long time will pose a threat to the safety of the environment and groundwater; the pile disposal method is to strengthen by increasing the number of piles The foundation soil can improve the bearing capacity of the foundation and eliminate the impact of negative friction resistance. Its cost is high and the amount of work is large, but the negative friction resistance has not been eliminated in essence.

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