Cast-in-place five-star-shaped end part threaded tapered pile and construction method of cast-in-place five-star-shaped end part threaded tapered pile

A construction method and technology of conical piles, applied in sheet pile wall, foundation structure engineering, construction, etc., can solve problems such as reducing bearing capacity and large settlement, and achieve the effect of eliminating influence, dealing with deep depth and improving utilization rate

CN102839655AInactive Publication Date: 2012-12-26CHINA UNIV OF GEOSCIENCES (WUHAN)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-12-26
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a cast-in-place five-star-shaped end part threaded tapered pile, which comprises a plastic sleeve pipe and a pile body, wherein the pile body is filled in an inner cavity of the plastic sleeve pipe, the cross section of the pipe body is in a five-star shape, the cross section area of the pile body is gradually reduced from top to bottom, in addition, the pile body is in an inverted cone shape in the longitudinal direction, and the lower end part of the pipe wall of the plastic sleeve pipe is the threaded pipe wall. The invention also provides a construction method of the cast-in-place five-star-shaped end part threaded tapered pile. The cast-in-place five-star-shaped end part threaded tapered pile has the advantages that the consumption of concrete is obviously saved, the unit material intensity utilization rate is improved, the positive frictional resistance of the pile side is more obviously improved, and the influence of the negative frictional resistance on the pile foundation is eliminated to a greater degree. In addition, the construction process is simple, the operability is high, the construction pressing-in efficiency is high, and the carrying force of the single pile is high.
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Description

technical field

[0001] The invention belongs to the technical field of building pile foundations, and in particular relates to a cast-in-place five-star-shaped end threaded tapered pile and a construction method thereof. Background technique

[0002] The pile foundation bears the load of the superstructure mainly through the frictional resistance of the pile side and the resistance of the pile end. When the settlement of the soil around the pile is greater than the settlement of the pile body due to self-consolidation, water subsidence, site filling, ground surcharge, pile top load, and groundwater level drop, negative frictional resistance will occur on the pile side. This frictional resistance constitutes a part of the load of the pressure-bearing pile, which reduces the bearing capacity of the pile and may cause greater settlement.

[0003] The generation of negative friction resistance has the following adverse effects: reducing the bearing capacity of the pile foundati...

Examples

Embodiment 1

[0033] Such as figure 1 and figure 2 As shown, it is a cast-in-place five-star-end threaded conical pile provided in Embodiment 1 of the present invention, which includes a plastic sleeve 7 and a pile body 12 filled in the cavity of the plastic sleeve 7 . The cross section of the pile body 12 is a five-star shape. The cross-sectional area of ​​the pile body 12 decreases gradually from top to bottom, and the pile body is vertically inverted tapered. The lower end of the pipe wall of the plastic sleeve 7 is a threaded pipe wall 13 , and the rest of the pipe wall of the plastic sleeve 7 is a smooth pipe wall 14 . Therefore, the pile body 12 also has a corresponding thread structure. The boundary position of the threaded pipe wall 13 and the smooth pipe wall 14 is mainly determined according to the boundary position of the negative friction resistance and the positive friction resistance of the pile body.

[0034] Such as Figure 3 to Figure 7 As shown, the embodiment of the...

Embodiment 2

[0044] Such as Figure 8 As shown, this embodiment is roughly the same as the cast-in-place five-star-shaped end threaded conical pile in Embodiment 1, the difference is that the lower end of the pipe wall of the plastic casing in this embodiment is a threaded pipe wall 15, The upper end is also a threaded pipe wall 16, and the middle is a smooth pipe wall 17. Preferably, the threaded pipe wall 15, the threaded pipe wall 16 and the smooth pipe wall 17 each account for one-third of the height.