A Rapid Detection Method for Pavement Deflection

Abstract

The invention discloses a fast detecting device for pavement deflection. The fast detecting device comprises a rear dragging type testing vehicle and a damping system which is arranged in a rear dragging type testing vehicle carriage. A trailer rear shaft is arranged on one side below the carriage, a tractor rear shaft is arranged on the other side below the carriage, a sliding guide rail is arranged inside the carriage, a guide rail supporting frame is arranged below the sliding guide rail, a steel beam support is arranged above the sliding guide rail, and the steel beam support slides on the sliding guide rail through sliding blocks below the steel beam support. A detection cross beam is arranged on the steel beam support, and no less than two laser Doppler tachometers are arranged on the detection cross beam and connected with a data collecting and processing system. The damping system comprises a damping air cylinder arranged on the steel beam support. The fast detecting device has the advantages that the structure is simple, the detecting precision and the detecting precision can be improved, the safety of operators can be guaranteed, and the effective usage rate of the pavement during deflection detecting can be improved. The invention further provides a fast detecting method for pavement deflection.

Description

technical field [0001] The invention relates to the technical field of road detection, in particular to a rapid detection device and method for road surface deflection. Background technique [0002] The traditional detection equipment calculates the deflection value index of the road surface by directly measuring the displacement of the road surface subsidence under the standard load (10t). Due to the slow test speed (4-5km / h) of this detection method, the speed of pavement deflection detection is greatly restricted. With the continuous development of technology, the laser Doppler velocimeter can be used to calculate the deflection value of the road surface through a series of mathematical operations according to the deformation speed of the road surface under the action of no load and standard load. In the above process, it is necessary to select multiple Puller laser velocimeters to simultaneously collect the signals of the unloaded area and the loaded area, and obtain th...

AI Technical Summary

Problems solved by technology

The purpose of calibration angle is mainly achieved by comparing the measured value of the acceleration sensor with the output speed value of the laser Doppler velocimeter, but this method also requires a special test road, and needs to embed the acceleration sensor on the test road, use and later maintenance higher cost

The third static measurement method is to fix the crossbeam of the Doppler laser velocimeter and move the calibration platform below to realize the relative movement with the laser. Although this method is theoretically feasible, it is not practical in the calibration process , in order to ensure the stiffness and measurement accuracy of the longer calibration platform, its structure is heavier, the cost is higher, and it is less practical in the actual use process

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