Sound wave propagation principle-based method for detecting grouting effect of pile bottom of bottom-enlarged grouting pile

A technique for bottom-expanding cast-in-situ piles and grouting effects, which is applied in the direction of material analysis, measuring devices, and instruments using sound waves/ultrasonic waves/infrasonic waves, which can solve problems such as lack of detection methods, and achieve simple and clear principles, small randomness, and accuracy Detection effect

Active Publication Date: 2017-05-31
ZHEJIANG UNIV
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Problems solved by technology

The purpose of the present invention is to provide a method for detecting the bottom grouting effect of bottom-enlarged cast-in-situ piles based on the principle of sound wave propagation in view of the lack of detection methods for bottom-enlarged cast-in-situ piles.

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  • Sound wave propagation principle-based method for detecting grouting effect of pile bottom of bottom-enlarged grouting pile
  • Sound wave propagation principle-based method for detecting grouting effect of pile bottom of bottom-enlarged grouting pile
  • Sound wave propagation principle-based method for detecting grouting effect of pile bottom of bottom-enlarged grouting pile

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Embodiment Construction

[0036] The present invention will be further elaborated and illustrated below in conjunction with the accompanying drawings and examples. The technical features of the various implementations in the present invention can be combined accordingly on the premise that there is no conflict with each other.

[0037] In this embodiment, the form of the bottom-enlarged cast-in-situ pile is as follows figure 1 shown. The method for detecting the bottom grouting effect of bottom-expanding cast-in-situ piles based on the principle of sound wave propagation includes the following steps:

[0038] Step 1: After the grouting of the bottom expansion grouting pile is completed, vertical holes are dug around the pile body, and several acoustic measuring tubes 2 are evenly buried according to the diameter of the pile. The lower end of the acoustic measuring tube 2 is closed, and the upper end is covered to prevent foreign matter from entering the tube and affecting the passage of the transduce...

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Abstract

The invention discloses a sound wave propagation principle-based method for detecting the grouting effect of the pile bottom of a bottom-enlarged grouting pile. For the bottom-enlarged grouting pile, after grouting is completed, a plurality of acoustic testing pipes are uniformly arranged around a pile body at proper distances and the pipes need to be longer than the pile; by taking clear water as a coupling agent, an acoustic wave transducer and an acoustic wave receiver are put into two acoustic testing pipes separately and sink to the bottoms of the pipes; proper acoustic wave parameters are selected, and the same elevation or a fixed elevation difference is kept; the acoustic wave transducer and the acoustic wave receiver are lifted upwards at a proper constant rate to obtain a time travel curve of the acoustic wave; and the grouting effect of the enlarged head of the pile end is analyzed from the time travel curve.

Description

technical field [0001] The invention belongs to the field of pile measurement by acoustic wave transmission method, in particular to a method for detecting the bottom grouting effect of bottom-expanded cast-in-place piles based on the principle of sound wave propagation. Background technique [0002] With the acceleration of urban development, the scale of municipal infrastructure, bridges, public and civil buildings is getting larger and larger, and the requirements for the bearing capacity of the foundation are rising. Especially in the southeast coastal areas of my country, where the soft clay layer is deep, ordinary cast-in-situ piles are difficult to meet the requirements of bearing capacity, and the economic cost is also rising. Therefore, the expanded-bottom cast-in-situ pile has become a common foundation form in soft soil areas. Compared with the same straight pile, its bearing capacity is significantly improved, and the settlement is also greatly reduced, which gre...

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Application Information

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IPC IPC(8): G01N29/024
CPCG01N29/024G01N2291/0228
Inventor 王奎华童魏烽肖偲吴斌杰
Owner ZHEJIANG UNIV
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