Tension line video deflection measuring device and method

Abstract

A method for measuring video deflection of tension line includes erecting fixed bolt and fixed pulley on piers at two sides of bridge, connecting two ends of tension line separately to said bolt and weight to make tension line be tightened, erecting video camera at position to be measured on bridge to let shooting tube right-point to tension line, moving video camera up and down to vary position of fixed light point of laser on tension line in image of video camera, collecting and calculating position of light point in image for obtaining deflection of bridge. The device for realizing said method is also disclosed.

Description

technical field [0001] The invention relates to a device and method for detecting and monitoring bridge deflection, which can also be used for detection and monitoring of ground subsidence, mountain movement, building subsidence, etc., especially a method for on-line monitoring of deflection using tension lines, lasers and video systems. Background technique [0002] Detecting bridge deflection plays an important role in modern road and bridge health detection and monitoring. In the prior art, there are more and more methods and devices for detecting and monitoring bridge deflection. Although the functions are the same, the structures are different. For example, the "displacement / deflection detection and monitoring device and method" disclosed in Chinese patent 200310057473.6 and the "multi-point dynamic deflection / displacement measurement device with self-calibration and self-encoding imaging method" disclosed in Chinese patent 200510020324.2, the former uses one-to-one mea...

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Problems solved by technology

For example, the "displacement / deflection detection and monitoring device and method" disclosed in Chinese patent 200310057473.6 and the "multi-point dynamic deflection / displacement measurement device with self-calibration and self-encoding imaging method" disclosed in Chinese patent 200510020324.2, the former uses one-to-one measurement and cannot be used One camera shoots and measures multiple targets, which greatly increases the cost of measurement; the latter has low measurement accuracy due to its wide measurement range and cannot meet the high-precision requirements

Another example is that the detection of bridge deflection by the photoelectric liquid connecting pipe method is greatly affected by temperature, and the calculation error is complicated

Another example is the 200510020375.5 "two-dimensional, large-scale laser deflection / displacement measurement method and device" disclosed in the Chinese patent. By controlling the controllable damping hinge structure, the laser beam reflecting the position of the measured structure is horizontally irradiated on the spot receiving and measuring device to form a spot , the spot and mark are imaged by the camera equipment, and then the relative distance between the center of gravity position of the laser spot and the light-emitting diode image is calculated to obtain the coordinates of the current spot, and the initial value is subtracted from the coordinates to obtain the displacement value of the current spot, and the measured The two-dimensional displacement of the structure, the laser beam of the device can only be shot horizontally on the spot receiving and measuring device, so the laser transmitter and the spot receiving and measuring device must be on the same horizontal line, which cannot be used for sites with inclination angles, the range of installation and use Limited, even if it is installed on a horizontal plane, the laser beam is required to be completely horizontal to the light spot, and it is difficult to debug and operate the receiving and measuring device

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