Non-contact type subsidence value detection system of portable falling weight deflectometer

Abstract

The invention provides a non-contact type subsidence value detection system (1) of a portable falling weight deflectometer. The non-contact type subsidence value detection system comprises a base (2), a detected portable falling weight deflectometer (3), a photoelectric sensor probe (4), a power supply and control system (5) and a platform electric control system (6), wherein the platform electric control system (6) is used for controlling the base (2) and the detected portable falling weight deflectometer (3) to be subjected to operation according with detection conditions; the subsidence value detection system further comprises an optical vibration isolation platform (9); the detected portable falling weight deflectometer (3) is mounted at certain planeness and the surface has roughness; the detected portable falling weight deflectometer has horizontal and vertical inherent frequency in a fixed range and amplitude on the optical vibration isolation platform (9) in a certain range, so that a detection result is optimized. The subsidence value detection system provided by the invention has consistent testing results and the accuracy, efficiency and operability are remarkably better than that of a traditional contact type measurement instrument; a non-contact and intelligent subsidence value detection device is adopted so that the measured results are more accurate and the continuous recurrence rate is improved.

Description

technical field [0001] The invention relates to the field of measurement, in particular to a subsidence value detection system of a non-contact hand-held drop weight deflection meter. Background technique [0002] The hand-held drop weight deflection meter is a dynamic measuring instrument, a special foundation construction quality measurement instrument for monitoring and detecting the dynamic characteristic index of the foundation-dynamic deformation modulus. It is widely used in railways, highways, high-speed rails, airports, and urban transportation. It is especially suitable for the detection of narrow areas of the site, such as the transition section of roads and bridges, existing road foundations, etc. After the measurement program is started, three impact tests will be carried out, and the subsidence tester will display the subsidence value after each impact. After a test cycle is over, the average subsidence value and dynamic deformation modulus value can be obtain...

AI Technical Summary

Problems solved by technology

The hand-held drop weight deflection meter is composed of a loading device, a sinking tester and a bearing plate. The sinking value of the sinking tester is more difficult to detect. The verification and calibration of a dynamic measuring instrument is a difficult point in length measurement. The hammer deflection meter detection device is equipped with a ring at the front end of the guide rod fixing frame, and a contact displacement sensor fixing frame is installed at the lower part of the column, so as to reproduce a certain standard sinking value during the action, but the operation steps of this method are complicated , the contact sensor is easy to separate from the detected instrument, resulting in detection distortion, and the post-calculation process is complicated, which greatly restricts the detection quality and efficiency

[0003] In addition, there are not many institutions currently researching the hand-held drop-weight deflection meter. For example, China Railway Group has studied the calibration device of the hand-held drop-weight deflection meter. They still use contact displacement sensors to detect the settlement value of the hand-held drop-weight deflection meter. To achieve fast response, there are data distortions, and it is impossible to accurately measure the indication error of the hand-held drop weight deflection meter; China Communications Corporation researched the application of the hand-held drop weight deflection meter in the subgrade construction of the Kua Expressway; North China University of Technology researched Teaching research on the correlation between railway subgrade compaction quality inspection indicators and subsidence values, but did not study the traceability of subsidence values

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