Vibration sensor for detecting roadbed of freeway

Abstract

The invention relates to roadbed pavement quality detection technology, in particular to a vibration sensor for detecting a roadbed of a freeway. The sensor is characterized by comprising a base body, an upper shell, a piston rod, a piston, a silicon rubber sealing ring, a photoelectric reflection receiving circuit, a liquid and a piston cavity, wherein the bottom surface of the piston cavity and the flat base body are connected into a whole through screws; the piston rod and the top surface inside the upper shell are fixed into a whole; the piston extends into the piston cavity; an opening of the piston cavity extends outwards; a lower opening of the upper shell extends inwards; the outward extension part of the piston cavity and the inward extension part of the upper shell form an inverse hanging structure; and the space between the outward extension part of the piston cavity and the inward extension part of the upper shell is sealed by the silicon rubber sealing ring. Therefore, the sensor is suitable for the detection of the quality of roadbed pavements with different structures.

Description

technical field [0001] The invention relates to a roadbed pavement quality detection technology, in particular to a vibration sensor for expressway roadbed detection. Background technique [0002] Subgrade pavement detection is actually the detection of subgrade and pavement compaction quality. The quality of subgrade and pavement compaction is one of the most important internal indicators of road engineering construction quality management. Only by fully compacting the subgrade and pavement structural layers can the subgrade , the strength, stiffness and smoothness of the road surface, and can guarantee and prolong the service life of the roadbed and road surface engineering. [0003] One of the existing methods for testing the quality of pavement compaction is the sand filling method. The sand filling method uses uniform sand to replace the volume of the test hole. It is the most common method at present. Many projects have listed the sand filling method as the field The ...

AI Technical Summary

Problems solved by technology

This method can be used to test the density of various soil or pavement materials. Its disadvantages are: it needs to carry a large amount of sand and weigh more times, so its test speed is slow

However, this is difficult in actual testing; only if the soil taken by the ring knife is exactly the soil in the middle of the rolling layer, the results obtained by the ring knife method may be roughly the same as those obtained by the sand filling method

In addition, the applicable area of ​​the ring knife method is narrow, and it cannot be used for stabilized soil and loose materials containing granular materials.

[0005] However, the quality of subgrade and pavement can be detected by detecting the degree of compactness of the road surface, which cannot explain the problem in some cases. The performance of the material change is very good, but it should first have outstanding water absorption, and if the pavement compaction is used as the standard, it is difficult to achieve the subgrade pavement compaction of ordinary high-grade highways

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