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Composite prestressed uplift pile with expansion heads

A technology of expanding head and pulling-resistant piles, applied in sheet pile wall, construction, foundation structure engineering, etc., can solve the problems of reducing the friction force between soil and pile, complicated production process, affecting the bearing pressure and tensile strength of piles, etc. Concentration of local stress, high prefabrication strength, and the effect of improving bearing capacity

Active Publication Date: 2012-02-08
从卫民
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the traditional uplift piles adopt non-prestressed reinforced concrete structure. When the steel bars are stretched longitudinally, the pile body will shrink radially, resulting in a reduction of the friction between the soil and the pile. At the same time, when the pile body is stretched and cracked, the buried Steel bars are prone to corrosion, which will also affect the pressure and tensile strength of piles
In recent years, the industry has continuously introduced prestressed steel cable pullout and anti-floating piles, but the production process is complicated and the steel consumption is also large

Method used

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  • Composite prestressed uplift pile with expansion heads
  • Composite prestressed uplift pile with expansion heads
  • Composite prestressed uplift pile with expansion heads

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Such as figure 1 As shown, the present invention includes a cement-soil mixing pile 1, a concrete columnar core 2 in the cement-soil mixing pile 1, and a cap surface 3 arranged at the upper end of the cement-soil mixing pile.

[0018] still as figure 1 As shown, the inner coaxial line of the concrete columnar core 2 is provided with a prestressed steel cable 4 (the steel cable 4 is set concentrically with the columnar core 2), the lower end of the steel cable 4 is provided with a first expansion head 6, and the upper end of the steel cable 4 A tensioned fixed connecting piece is provided, and the upper end of the steel cable and its connecting piece are located on the bearing platform. In this embodiment the connectors are anchor clamps.

[0019] still as figure 1 As shown, the first enlarged head 6 is a concrete prefabricated part, and the concrete prefabricated part is provided with a hole, and the lower end of the prestressed steel cable 4 passes through the hole ...

Embodiment 2

[0023] Such as figure 2 As shown, the lower end of the prestressed steel rope 4 is provided with two expansion heads (the first expansion head 6 and the second expansion head 9) sequentially from bottom to top. Preparation process: pass the steel strand through the vibrating tube from bottom to top, then put the vibrating tube into the cement-soil mixing pile, withdraw the tube upward while vibrating, pour concrete into the tube at the same time, and then use a hammer to Hit the bottom to make the concrete bulge around, thus forming the second enlarged head. All the other implementations are as in Example 1.

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PUM

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Abstract

The invention discloses a composite prestressed uplift pile with expansion heads, which comprises a cement stirring pile, a concrete cylindrical core and a carrying table top, wherein the concrete cylindrical core is arranged in the cement stirring pile, and the carrying table top is arranged at the upper end of the cement stirring pile. The composite prestressed uplift pile is characterized in that a prestress steel cable is coaxially arranged inside the concrete cylindrical core, at least one expansion head is arranged on the prestressed steel cable, and the upper end of the prestressed steel cable passes out of the carrying table top and is fixed through a connecting element after being tensioned. The composite prestressed uplift pile has the advantages that good anti-floating and uplift effects are realized, the preparation is simple, and the steel consumption is low.

Description

Technical field [0001] The present invention involves the construction field, and the specific anti -pile is involved. Background technique [0002] Building pile foundations are usually mainly under pressure. Due to the development and utilization of underground space in recent years, a large number of new underground garages have been newly built, which has led to a new hot topic.Most of the traditional anti -pile piles adopt non -discouraged stress reinforced concrete structure. When the steel bars are pulled in the vertical pulp, the radial contraction of the pile body will be reduced, resulting in the decrease in the friction of the soil and the pile.The steel bar is easy to rust, which will also affect the pressure and tensile of the pile.In recent years, the industry has continuously launched prestressed steel twisted and anti -floating piles, but its production process is complicated, and the amount of steel has also been used. Invention content [0003] The technical pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D5/58E02D5/50E02D5/48
Inventor 从卫民
Owner 从卫民