Method for testing grouting compactness degree of prestressed pore of bridge based on elastic-wave energy dissipation rate

Abstract

The invention discloses a method for testing the grouting compactness degree of a prestressed pore of a bridge based on an elastic-wave energy dissipation rate, belonging to the technical field of quality detection on bridge/culvert engineering. In the grouting construction on a prestressed anchor (cable) of a bridge, the prestressed anchor (cable) can be corroded caused by undesirably-packaged cement mortars and anchor rods, thereby causing the failure of the prestressed anchor (cable) and then endangering the safety of structures. In the prior art, the anchoring quality of an anchor rod can not be evaluated completely. The method provided by the invention is implemented through analyzing the fluctuation characteristics (speed, frequency, elastic-wave energy dissipation, and the like) of pickup signals of sensors at the two ends of the prestressed anchor by adopting impact elastic waves generated by vibrations at the two ends of the prestressed anchor of the bridge so as to detect the grouting compactness degree of the prestressed anchor (cable) of the bridge. The method provided by the invention has the advantages of maximizing the elimination of system errors caused in the process of test, accurately testing the elastic-wave energy dissipation rate of the prestressed anchor (cable), and effectively completing the test on the grouting compactness quality of the prestressed anchor (cable) of the bridge. The method provided by the invention is also applicable for the test on the grouting compactness qualities of all prestressed structures the two ends of which are provided with exposed anchor heads.

Description

technical field [0001] The invention relates to the technical field of bridge and culvert engineering quality detection, in particular to a method for testing the grouting density of bridge prestressed tunnels based on elastic wave energy dissipation rate. Background technique [0002] In the grouting construction of bridge prestressed tunnels in the prior art, unsatisfactory wrapping of cement mortar and anchor rods will affect its corrosion, lead to failure and endanger the safety of structures. The existing technology can not carry out complete evaluation to the anchorage quality of the anchor bolt. The present invention generates shock elastic waves by adopting the end excitation at the two ends of the prestressed anchor bolt of the bridge, and analyzes the fluctuation characteristics (velocity, frequency, etc.) of the signals picked up by the sensors at both ends of the anchor bolt. , elastic wave energy dissipation, etc.), to detect the density of bridge prestressed tu...

AI Technical Summary

Problems solved by technology

[0002] In the prior art bridge prestressed channel grouting construction, the unsatisfactory wrapping of cement mortar and anchor rod will affect its corrosion, lead to failure and endanger the safety of the structure

The existing technology can not carry out complete evaluation to the anchoring quality of the bolt. The present invention generates shock elastic waves by adopting the end excitation at the two ends of the prestressed anchor of the bridge, and analyzes the fluctuation characteristics (speed, frequency, etc.) of the signals picked up by the sensors at both ends of the anchor. , elastic wave energy dissipation, etc.), to detect the density of bridge prestressed tunnel grouting

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