Method for testing grouting compactness of pre-stressed duct

Abstract

The invention discloses a method for testing grouting compactness of a pre-stressed duct. The method comprises the following steps: S1, calibration of testing lines: marking a grouting compactness testing line on a side face of a duct region on a beam column, and marking a grouting compact part testing line on a side face of a duct-free region on the beam column; S2, arrangement of testing points: arranging N testing points on the grouting compactness testing line and the grouting compact part testing line; S3, numerical value acquisition: acquiring the reflection wave velocity Vi of a certain testing point on the grouting compactness testing line and acquiring the reflection wave velocity Vsdi of the certain testing point on the grouting compact part testing line; S4, quantitative computing: judging whether the reflection wave velocity of the certain testing point on a certain grouting compactness testing line changes suddenly or not. The method can be used for quantitatively detecting the compactness of the pre-stressed duct.

Description

technical field [0001] The invention relates to the technical field of bridge engineering quality detection, in particular to a method for testing the density of grouting in prestressed tunnels. Background technique [0002] With the rapid development of my country's highway and bridge engineering, prestressed concrete bridges have taken a dominant position in my country's bridge construction and are widely used in bridge construction projects. Among them, the prestressed steel strand should ensure long-term function in the process of bridge use and meet the design requirements, and the grouting quality effect of the prestressed tunnel is one of its important influencing factors. If the grouting in the prestressed channel is not dense, the metal material will corrode quickly under the high stress state, and the steel strand material in the channel is prone to corrosion, which will affect the durability and safety of the bridge; and there is grouting under the prestressed ten...

AI Technical Summary

Problems solved by technology

If the grouting in the prestressed channel is not dense, the metal material will corrode quickly under the high stress state, and the steel strand material in the channel is prone to corrosion, which will affect the durability and safety of the bridge; and there is grouting under the prestressed tendon When the quality is defective, the stress concentration of the concrete will cause damage, and the loss of prestress caused by the passage of time will change the design stress state of the beam body, thereby affecting the service life of the bridge

[0003] At present, there are many detection methods for detecting the grouting density of prestressed tunnels in China, such as equivalent wave velocity method (IEEV), ultrasonic imaging method (UT), surface wave spectral imaging method (SASW), stack imaging method based on shock echo amplitude spectrum ( SIBIE), ground penetrating radar (GPR), X-ray imaging, γ-ray imaging and other methods, but due to the reasons of test accuracy, scope of application, test efficiency and cost, currently only the equivalent wave velocity method (IEEV) is relatively simple and reliable , effective, but the equivalent wave velocity method (IEEV) cannot use accurate numerical values ​​for quantitative analysis of the test results. In order to make the test results more accurate and reliable, it is now necessary to introduce quantitative analysis for the detection of prestressed tunnel grouting density method

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