Press-in type on-site rebound modulus measuring device

Abstract

The invention discloses a press-in type on-site rebound modulus measuring device. The device comprises a springback core, an outer sleeve and dial gauges, wherein the springback core penetrates through the outer sleeve, a protrusion is arranged in the middle of the springback core and abuts against a concave part of the inner wall of the outer sleeve, a springback core end is arranged on the lowerportion of the springback core, and the multiple dial gauges are arranged on the top of the outer sleeve, abut against the protrusion of the springback core and are symmetrically distributed about the springback core. The device is small in size and convenient to carry, can be directly pressed into a corresponding position of a soil body for measurement through a loading device, and is more convenient to operate; surface soil does not need to be excavated on a large scale, the requirement for an operation surface is lower than that of a traditional measurement method during work, damage to anoriginal test surface is small, and the economy and effectiveness are achieved; the two dial indicators which are symmetrically distributed are adopted, so that the average change value of the dial indicators can be solved to reduce springback error caused by inclination of the device; the device is relatively small in number of components, simple in structure, clear in principle and good in adaptability to various soil conditions.

Description

technical field [0001] The invention relates to a device for measuring elastic modulus, in particular to a press-in type on-site elastic modulus measuring device. Background technique [0002] The modulus of resilience refers to the ratio of the stress generated by the subgrade, pavement and road construction materials under load to the corresponding rebound strain. The ability to resist vertical deformation is an important design parameter in engineering. [0003] The existing codes in our country have given the recommended values ​​of the elastic modulus of soil in different natural areas, but they cannot be used in all engineering situations. At present, the relatively mature on-site elastic modulus measurement methods include the bearing plate method and the Beckman beam method. The bearing plate method needs to excavate a large surface covering layer, carefully level the surface of the soil foundation, sprinkle dry and clean fine sand to fill the recesses of the soil ...

AI Technical Summary

Problems solved by technology

The bearing plate method needs to excavate a large surface covering layer, carefully level the surface of the soil foundation, sprinkle dry and clean fine sand to fill the recesses of the soil foundation, and install a deflection meter to measure the rebound value, which not only damages the scope of the operating surface It is large and the operation process is relatively complicated; the Beckman beam method has a large workload and requires the cooperation of multiple people to carry out, driving, moving the deflectometer, measuring, and the implementation cost is high and complicated

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