Uplift pile with upper straight rod and lower screw suitable for seasonal frozen soil regions and construction method thereof

Abstract

The invention discloses an uplift pile with an upper straight rod and a lower screw suitable for seasonal frozen soil regions and a construction method thereof. The uplift pile is characterized by comprising a plurality of anti-punching shear bars, a sand pulp and a sleeve pipe, wherein the anti-punching shear bars are positioned at the central position of the uplift pile; the anti-punching shear bars are wrapped with the sand pulp to form a cylindrical structure; a connector protruding out of the top of each of the uplift pile is reserved at the top of each of the anti-punching shear bars; a thread is arranged on the outer wall of the lower part of the cylindrical structure to form the screw part of the uplift pile; no thread is formed on the outer wall at the upper part of the cylindrical structure so as to form the straight rod part of the uplift pile; the outer wall of the straight rod part of the uplift pile is sleeved with the sleeve pipe; the sleeve pipe comprises an inner layer sleeve pipe and an outer layer sleeve pipe; the outer layer sleeve pipe can produce displacement relative to the inner layer sleeve pipe in the axial direction of the uplift pile; the inner wall of the inner layer sleeve pipe is in contact with the sand pulp; and the outer wall of the outer layer sleeve pipe is in contact with the frost-heaving and thawing-settlement foundation.

Description

technical field [0001] The invention relates to an uplift pile, in particular to an uplift pile with an upper straight rod and a lower screw rod suitable for seasonal frozen soil regions and a construction method thereof. Background technique [0002] An uplift pile is a type of pile foundation that bears an uplift load. Its bearing capacity refers to the maximum uplift load it can bear, and deformation refers to the upward displacement of the pile top under the uplift load. In seasonally frozen soil areas, the foundation soil around the piles of the uplift piles may undergo frost heave-thaw settlement cycles due to seasonal changes. This effect will inevitably affect the bearing characteristics of the uplift piles, which are mainly reflected in two aspects: [0003] One is that when the foundation soil around the pile is frost heaved, there will be a new pile side friction force due to the relative displacement between the foundation soil and the uplift pile during the fros...

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Problems solved by technology

[0004] Second, when the foundation soil around the pile thaws and settles, because the solid ice in the soil gradually transforms into liquid water during the thawing process, the shear strength of the soil will decrease significantly, and may even be lower than the value before frost heave, making The shear strength of the pile-soil interface decreases, the bearing capacity of the uplift pile decreases, and the displacement of the pile top increases under the same load; The reduction of the shear strength of the soil interface also develops gradually from the surface down.

[0006] Although the first type of method can eliminate or partially eliminate the influence of frost heave-thaw settlement on the bearing characteristics of uplift piles, it is obviously uneconomical; the second type of method can improve the safety of uplift piles and properly reduce frost heave-thaw However, it cannot eliminate the influence of frost heave-thaw settlement on the load-bearing characteristics of the uplift piles, which is naturally uneconomical

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