基于冲击回波法的预应力管道压浆密实性检测

doi:10.11720/wtyht.2019.1098

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Abstract

A detailed description of impact-echo method was given firstly,then four different situations of grouting quality were modified from empty to dense through making test model.After that,the impact-echo method was adopted to detect the grouting quality of tendon ducts.The study was summarized as follows:If the reflection time of slab bottom and nominal thickness of slab increased,the degree of density would increase;the reflection time and nominal thickness of slab was the biggest when testing was from half-hole of web.At the same time,the reflection time of compacted and uncompacted tendon ducts was basically the same.In the end,the uncompacted parts of the prestressed pipe grouting were put forward.The method was verified by the engineering project and was proved to be of reference value.

Key words： pre-stressed duct impact-echo method grouting compactness

Received: 09 March 2018 Published: 15 August 2019

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	Articles by authors
	Guang-Zhen QU
	Guang-Li ZHOU
	Ke-Chao ZHANG
	Yan-Wei WANG

Cite this article:

Guang-Zhen QU,Guang-Li ZHOU,Ke-Chao ZHANG, et al. The detection of grouting compactness of pre-stressed ducts based on the impact-echo method[J]. Geophysical and Geochemical Exploration, 2019, 43(4): 919-924.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1098 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I4/919

Schematic of impact echo method

Impact echo response of three kinds of prestressed pipelines

Multifunctional detector for prestressed concrete beams

Shock hammer diameter selection

The test model
a—the model size;b—model entity

Excitation direction
a—roof direction excitation;b—web direction excitation

Time domain and predominance period of pipeless specimens
a—time domain curve of measuring point;b—measuring point MEM predominance period

Time domain and predominant period of specimen roof directional excitation
a—time domain curve of measuring point;b—measuring point MEM predominance period

Summary results for each defect type

Schematic of survey line layout

Verification of uncompacted pipeline grouting

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