Method for quickly detecting quality of gravel pile

A detection method and technology of gravel piles are applied in soil protection, foundation structure testing, construction and other directions, which can solve problems such as inability to quickly and accurately evaluate project quality, high detection cost, and impact on construction progress, etc. Work efficiency, ensure project quality, and improve the effect of service life

Inactive Publication Date: 2010-12-22
JIANGSU TRANSPORTATION RES INST CO LTD
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Problems solved by technology

[0003] At present, the traditional test methods (such as load, etc.) of the quality of domestic road gravel piles generally have shortcomings such as long detection time and high

Method used

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  • Method for quickly detecting quality of gravel pile
  • Method for quickly detecting quality of gravel pile
  • Method for quickly detecting quality of gravel pile

Examples

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Embodiment Construction

[0039] Further description will be given below in conjunction with the examples.

[0040] The rapid detection method of gravel pile quality comprises the following steps:

[0041] (1) Preparations before the DPT test:

[0042] Leveling the site: so that the drilling rig can be placed smoothly.

[0043] The drill pipe used in the heavy-duty dynamic penetrating test should be checked regularly, the relative bending of the drill pipe is less than 1 / 1000, and the joints should be firm, otherwise the drill pipe will shake sideways after being hammered.

[0044] The heavy-duty dynamic penetrating test should adopt the free-fall hammer method with automatic decoupling, and reduce the frictional resistance between the guide rod and the hammer to keep the hammering energy constant.

[0045] (2) DPT test procedure: After the installation and inspection work is done, select the point to be tested, and move the DPT to the test site for testing.

[0046] ① Stand the sliding rod vert...

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Abstract

The invention relates to a method for quickly detecting the quality of a gravel pile, which comprises the following steps: the process for carrying out a heavy dynamic penetration test (DPT) on a pile body comprises the following steps: in the heavy dynamic penetration test, by using a power hammer of which the weight is 63.5kg and the drop height is 76cm and using a cone head as a penetration head, carrying out continuous heavy dynamic penetration tests along the depth direction of the pile body, recording the actually measured hammering number when the pile body is penetrated for every 10cm, correcting the hammering number, and then, determining the bearing capacity (kPa) of the foundation according to the corrected heavy cone dynamic penetration hammering number N63.5; and the process for carrying out a standard penetration test (SPT) comprises the following steps: by using a punching hammer of which the weight is 63.5kg and the drop height is 76cm, punching a standard penetrometer into the soil for 15cm and then for 30cm, utilizing the hammering number for last 30cm as a standard penetration test index, and then, computing the bearing capacity of the foundation after correcting the hammering number according to the corrected heavy cone dynamic penetration hammering number N63.5.

Description

technical field [0001] The invention belongs to the field of road engineering, in particular to a method for quickly detecting the quality of gravel piles. Background technique [0002] With the rapid development of social economy and traffic construction, the problem of soft foundation treatment is constantly involved in highway engineering construction. Because soft soil will cause harm to the subgrade, resulting in substantial subsidence of the subgrade pavement structure and lateral displacement of the subgrade foundation, scientific treatment of soft soil foundation is an inevitable engineering technical problem for highway construction in soft soil areas. In the reinforcement of soft soil subgrade foundation, the vibrating crushed stone pile method is a treatment method with relatively simple construction and quick reinforcement effect. It uses the combination of crushed stone in the pile body and soft soil around the pile to form a composite foundation improvement. T...

Claims

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Application Information

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IPC IPC(8): E02D33/00E02D3/08
Inventor 何淼万晓峰
Owner JIANGSU TRANSPORTATION RES INST CO LTD
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