Pile foundation structure for reducing side friction force

Abstract

The invention belongs to the technical field of track traffic projects, building construction engineering and the like, and particularly relates to a pile foundation structure for reducing side friction force. The pile foundation structure comprises a pile body main body, an outer sleeve and a lubricating agent, wherein the pile body main body is a preformed pile which is formed in advance or is of a pile structure which is poured on site, the top of the pile body main body is connected with a support platform, and the bottom of the pile body main body extends into a supporting layer so as to achieve a support effect; the outer sleeve sleeves the periphery of the pile body main body, and the bottom end of the outer sleeve extends into the supporting layer and is fixed; and a gap between the pile body main body and the outer sleeve is filled with the lubricating agent. The pile foundation structure can resist the influence of positive friction force and negative friction force at the same time, the deformation of the pile foundation structure and surrounding buildings is controlled from two aspects, and the pile foundation structure is suitable for the preformed pile and the filling pile, has the advantages of simplicity and convenience in construction, safe and reliable structure and the like and is especially suitable for protection engineering of sensitive buildings (structures).

Description

technical field [0001] The invention belongs to the technical fields of rail transit engineering, housing construction engineering, etc., and more specifically relates to a pile foundation structure for reducing lateral frictional resistance. Background technique [0002] Pile foundations can be divided into friction piles and end-bearing piles according to the principle of bearing capacity. Among them, the vertical load on the top of the friction pile is mainly borne by the friction force on the pile side, and the bearing force at the pile end is relatively small. Generally, after the pile is subjected to axial load, it will displace downward relative to the soil on the side of the pile, so the soil will produce upward frictional resistance on the pile, which is called positive frictional resistance; however, when the soil around the pile occurs for some reason When the settlement rate of the soil is greater than the sinking rate of the pile, the soil on the side of the pil...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned problems encountered in the use of friction piles, at present, the method of repairing and deforming the road surface and buildings deformed due to settlement is generally adopted. However, the existing operation and maintenance are all under the condition that the deformation has already occurred. Therefore, the following problems still exist: (1) The potential safety hazards caused by settlement deformation cannot be discovered and eliminated in time, which may easily lead to accidents; (2) Due to the repeated occurrence of settlement deformation, the investment in later operation and maintenance will be large, High operation and maintenance costs

However, the technical solutions provided in the above-mentioned patents can only deal with the impact of negative frictional resistance, and cannot eliminate the impact of positive frictional resistance on the side of the pile foundation, and positive frictional resistance is the same as negative frictional resistance. The condition of the pile foundation and surrounding buildings is affected, so it is also important to eliminate the effect of positive friction

In addition, and the subject of the above-mentioned technical scheme is relatively single, it cannot be applied to prefabricated piles and cast-in-situ piles at the same time

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