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Evaluating method for quality of grouting anchor lap joints of prefabricated concrete structural rebars

A concrete structure, grout-anchor overlapping technology, applied to structural elements, building components, measuring devices, etc., can solve the problems of non-disclosure, etc., and achieve the effect of simple operation, fast and effective detection, and high working frequency

Active Publication Date: 2018-11-27
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are no relevant research reports on the quality evaluation method of steel grout anchor lap joints in prefabricated concrete structures based on piezoelectric impedance effects at home and abroad.

Method used

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  • Evaluating method for quality of grouting anchor lap joints of prefabricated concrete structural rebars
  • Evaluating method for quality of grouting anchor lap joints of prefabricated concrete structural rebars
  • Evaluating method for quality of grouting anchor lap joints of prefabricated concrete structural rebars

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specific Embodiment

[0040] A method for evaluating the quality of a prefabricated concrete structure steel grout anchor lap joint, comprising the following steps:

[0041] (1) Select the component to be tested

[0042] The prefabricated upper shear wall component 1 in the same floor is selected in a quincunx shape;

[0043] (2) Determine the pasting site

[0044] Prefabricated upper shear wall elements 1 (eg figure 1 The shown includes upper shear wall longitudinal reinforcement 11, metal bellows 12, left slurry layer 13, grouting material 14 and lower shear wall longitudinal reinforcement 15) after loading to the construction site for hoisting and grouting, determine the piezoelectric sheet according to the construction drawings 2 Pasting position, if the number of metal bellows 12 embedded in the prefabricated upper shear wall component 1 is even, then paste a piezoelectric sheet 2 every other metal bellows 12 from left to right, if the embedded metal bellows 12 is an odd number, and a piezo...

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Abstract

The invention discloses an evaluating method for quality of grouting anchor lap joints of prefabricated concrete structural rebars. The evaluating method is characterized by comprising the following steps: sticking a piezoelectric patch to the middle part of the concrete surface in a grouting anchor lap joint area of the prefabricated concrete structural rebars; using a precise impedance analysismeter for applying a sweep frequency voltage signal to the piezoelectric patch; utilizing an electromechanical coupling effect of the piezoelectric patch and the structure to receive an electric admittance signal fed back by the piezoelectric patch; comparing with a standard conductivity signal curve; analyzing and testing a main peak frequency index and a root mean square RMSD index of the conductivity signal curve of the piezoelectric patch; and evaluating the quality of the grouting anchor lap joints of prefabricated concrete structural rebars in projects. The evaluating method has the advantages that the piezoelectric patch is integrated with a sensor and an exciter, the working frequency is high, the external disturbance is small, the grouting density in the grouting anchor lap jointarea can be accurately detected, no influence on the load-carrying capability of the grouting anchor lap joints is generated, the quick and efficient detection can be realized, the operation is simpleand the evaluating method is economical and practical.

Description

technical field [0001] The invention relates to a method for detecting the connection quality of steel bars in assembled concrete structures, in particular to an evaluation method for the quality of steel grout-anchor lap joints in assembled concrete structures. Background technique [0002] Compared with the traditional cast-in-place structure, the prefabricated concrete structure is a green and environmentally friendly building, which has a series of advantages such as low environmental pollution, high resource utilization rate, low labor cost, and the quality of building components is easier to guarantee, so it has been vigorously promoted in my country. A series of prefabricated building technologies such as prefabricated shear wall structure, prefabricated frame structure and prefabricated assembled pier cap beam structure have been formed. [0003] Grout-anchor lap joint is a common way to connect steel bars in prefabricated concrete structures, and its reliable and saf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04E04C5/16
CPCE04C5/163G01N27/041
Inventor 李俊华陈文龙孙彬严蔚
Owner NINGBO UNIV
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