Apparatus and method for measuring road bed sedimentation from long distance by laser

Abstract

The invention relates to a device and a method for remotely measuring subgrade settlement by utilizing a laser and belongs to the technical field of optical measurement and geometric position measurement. The device of the invention comprises a settlement monitoring pile consisting of a bottom plate (501) and a measuring rod (502), a point light (1), a fixed observation pile (6), a laser measuringunit (2), a measuring signal transmission unit (3), a central processing unit (7) and power supply modules (401 and 402). The method comprises the following steps: the settlement monitoring pile is buried in a point to be measured and the point light is arranged on the settlement monitoring pile, so that the point light and the subgrade of the point to be measured settle synchronously; the pointlight is imaged through a lens (201) of the laser measuring unit, and an image point A'is positioned on a photoelectric detector (202); and the displacement of the object point of the light can be calculated through the displacement of the image point, that is, the subgrade settlement amount of the point to be measured. The invention has high measurement precision, can implement the settlement measurement in the construction process or after the construction, and the remote settlement measurement of any positions and any depth of a subgrade.

Description

technical field [0001] The invention belongs to the technical field of optical measurement and geometric position measurement, and relates to a device and method for remotely measuring subgrade settlement by using laser. Background technique [0002] Subgrade settlement is unavoidable during and after road construction. Due to settlement and uneven settlement, the track sinking and rail surface bending will be caused, which will affect the smoothness of the line; in the track passing the bridge, it will cause the settlement difference between the bridge abutment and the roadbed. When the train passes through these sections, Due to the sudden change of track stiffness and deformation caused by settlement, the dynamic action between the wheel and rail increases, which causes track damage and affects the stability and safety of driving. In order to understand the settlement of the subgrade under load and the trend of settlement changes in time, so as to take effective measures...

AI Technical Summary

Problems solved by technology

This system takes a point outside the subgrade, that is, the position of the observation cup, as the reference point. Its shortcoming is that the measurement point and the reference point are connected by a pipeline. If the flexible pipeline expands or the pipeline leaks due to external factors, the Affect the accuracy of the measurement results

[0009] To sum up, the following three main disadvantages generally exist in the existing technology: (1) relying on manual measurement or recording, the measurement efficiency is low, and the detection accuracy is low; (2) when selecting the reference point, stability and low cost cannot be achieved at the same time; (3) ) measurements cannot be monitored remotely, nor can automatic measurements be made

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