Bridge prestressing force pore path grouting defect detection method
A technology of channel grouting and quality detection method is applied in the field of testing the quality of prestressed channel grouting in post-tensioned prestressed bridges.
Active Publication Date: 2011-08-17
BEIJING TONGDU ENG GEOPHYSICS LTD
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is to provide a bridge prestressed channel grouting defect detection method to overcome the above-mentioned IE method, ultrasonic tomography method, infrared thermal imaging method, etc. cannot effectively detect the problem of channel grouting quality
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[0020] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.
[0021] Such as figure 1 Shown, the concrete steps of bridge prestressed tunnel grouting quality detection method of the present invention comprise:
[0022] Step 1: Excite elastic waves at any end of the prestressed tunnel, and simultaneously measure scattered waves and transmitted waves at both ends of the prestressed tunnel;
[0023] Step 2: performing time-frequency analysis on the transmitted wave to obtain the time-frequency spectrum of the transmitted wave, and identifying the time-frequency distribution of all different modal seismic phases in the transmitted wave according to the energy of the time-frequency spectrum;
[0024] Step 3: Perform time-frequency analysis on the scattered wave to obtain the time-...
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The invention discloses a method for detecting the prestressing force pore path grouting quality of a prestressing force concrete bridge. The method comprises the following steps: respectively arranging two detectors at the two ends of a prestressing force pore path; exciting one end of the prestressing force pore path to generate shock waves; respectively recording a scattered wave and a transmitted wave in the prestressing force pore path by the two detectors at the two ends; carrying out modal identification on the transmitted wave; carrying out time-frequency analysis on the scattered wave; carrying out migration imaging by using the modal of the transmitted wave; and carrying out defect identification by using a migration image. By the method provided by the invention, the properties, scale and position of the grouting defect can be reliably determined by combining time frequency analysis which is an unsteady-state signal analysis technology with a migration imaging technology, based on a sound wave scattering technology and deep understanding on the internal elastic wave vibration characteristics of a bridge body.
Description
technical field [0001] The invention relates to the field of concrete bridge construction quality detection, and is mainly aimed at the detection of the grouting quality of prestressed channels in post-tensioned prestressed bridges. Background technique [0002] In the construction of railways and highways, more and more prestressed concrete bridges are used. Prestressed concrete bridges reduce or offset the tensile stress caused by the load by applying pressure to the tension area in advance, thereby delaying the appearance and development of concrete cracks, and greatly improving the crack resistance and stiffness of the bridge. At present, most prestressed bridges are constructed by the post-tensioning method, that is, the concrete is poured first, and the prestressed steel bars are stretched after reaching more than 75% of the design strength to form the prestress. When pouring the elements, a metal or plastic bellows is used to form a pipe in the concrete through which...
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Inventor 赵永贵蒋辉赵晓鹏
Owner BEIJING TONGDU ENG GEOPHYSICS LTD