Rigid pavement deflection test device and test method thereof

Abstract

The invention discloses a rigid pavement deflection test device and a test method thereof. The device comprises a Benkleman beam, a probe arranged at the front end of the Benkleman beam, a support arranged in the middle of the Benkleman beam, a height adjustable main tripod for fixing the support, a dial indicator arranged at the rear end of the Benkleman beam, an instrument stand for fixing the dial indicator, and a height adjustable auxiliary tripod for fixing the instrument stand. The method comprises the following steps: erecting the main tripod and the auxiliary tripod on places outside an earth shoulder or roadbed outside a rigid pavement slab, enabling the Benkleman beam to extend into a rigid pavement, and placing the probe at the front end of the Benkleman beam on a pavement test point; then regulating the main tripod, the auxiliary tripod and the probe and keeping the Benkleman beam horizontal; finally, performing static load on the rigid pavement by a test vehicle, or performing dynamic load on the test point at a certain speed, reading the dial indicator to obtain the static or dynamic rebound deflection value of the rigid pavement, and drawing a rigid pavement deflection basin at the same time.

Description

technical field [0001] The invention relates to the fields of acquisition of structural design parameters of rigid pavement and detection of rigid pavement, in particular to a rigid pavement deflection test device and a test method thereof. technical background [0002] At present, domestic and foreign pavement deflection testing methods mainly include: Beckman beam method (rebound deflection of pavement), automatic deflection test method (total deflection of pavement), falling weight deflection test method (dynamic deflection of pavement). The conditions and scope of use of various test methods are as follows: [0003] (1) The Beckman beam method is suitable for measuring the rebound deflection value of roadbed and asphalt pavement. The deflection of the asphalt pavement is based on the standard temperature of 20°C. When testing at other temperatures (over the range of 20°C ± 2°C), the deflection value of the asphalt pavement with a thickness greater than 5cm should be cor...

AI Technical Summary

Problems solved by technology

However, the existing Beckman beam technology has the following defects: (1) usually only the single-point maximum rebound deflection value of the pavement under the static vehicle load can be measured, which cannot reflect the dynamic characteristics of the pavement structure under the traffic load and the overall The shape of the deflection basin; (2) As the grade and strength of the road surface increase, the radius of the deflection basin will increase

It adopts the working principle of leverage. When the range of deflection basin is large, the deformation at the fulcrum will have a significant impact on the test results; (3) only measuring the maximum rebound deflection value of a single point on the road surface cannot reflect the power of the moving vehicle on the road surface effect, the dynamic deflection value of the road surface cannot be measured

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