End-carrying type large-diameter pile pier vertical bearing capacity detecting method

A detection method and large-diameter technology, which is applied in the test of basic structure, construction, basic structure engineering, etc.

Inactive Publication Date: 2003-11-12
董天文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the existing methods, the present invention provides

Method used

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  • End-carrying type large-diameter pile pier vertical bearing capacity detecting method
  • End-carrying type large-diameter pile pier vertical bearing capacity detecting method
  • End-carrying type large-diameter pile pier vertical bearing capacity detecting method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0061] Take the φ300mm pile test as an example. According to the above method, the test data is shown in the following table:

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[0068] Self-balance detection

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Abstract

The end-bearing type large-diameter pile pier vertical load-bearing capacity detection method includes the following steps: a. according to the geological prospecting material estimating end-bearing capacity and frictional resistance value, designing and making load box; b. welding the load box on the full-length reinforcing cage end portion, hoisting and placing the reinforcing cage into the pile hole; c. cleaning pile hole, check and acceptance and pouring concrete; d. after the concrete strength is reached to 70%, slow-speed retaining loading process or rapid-speed retaining loading process to detect the load-bearing capacity of pile; and e. high-pressure injecting flow state expansion concrete into the load box. Its detection cost is low and its detection data are safe and reliable.

Description

Technical field [0001] The invention belongs to the technical field of construction. Background technique [0002] High-rise and ultra-high-rise buildings are increasing day by day. Large-diameter piles with a bearing capacity of hundreds of tons or thousands of tons are widely used. Vertical static load tests are more difficult. Dr. Jorj. The method won the Outstanding Contribution Award of the American Deep Foundation Association and was soon promoted and applied all over the world. The principle is to use the jack-type load box (o.cell) to be installed at the bottom of the pile, and the pressure of the hydraulic system of the jack is used to push the pile body upwards. Measure the frictional resistance of the pile, push down the bearing layer of the pile, twice the thrust is the bearing capacity of the pile, if one party fails in advance, the total bearing capacity of the pile cannot be obtained. In southern my country, the total bearing capacity of the bearing layer is ...

Claims

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Application Information

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IPC IPC(8): E02D33/00
Inventor 董天文王明恕
Owner 董天文
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