Agitation type pavement deflection tester

Abstract

The invention discloses an excitation road deflection tester, which belongs to the field of testing road deflection, the structure of the invention comprises a guide bar, a heavy hammer, a release mechanism, a load transfer mechanism, a level transfer frame, a center displacement sensor, an auxiliary displacement sensor and a load sensor, and is characterized in that a detonative power generative mechanism is arranged on the upper side of the load transfer mechanism, and the initiation of the detonative power generative mechanism is achieved through the impact of the heavy hammer. Compared with the prior art, the excitation road deflection tester of the invention has the characteristics of flexible moving, big loading force range and convenient using and the like, is capable of being widely used to test the road deflection indexes, and is also capable of being used to test the indexes of non-deform ability of reaction structures which are the subgrade resilient modulus and the like.

Description

technical field [0001] The invention relates to the field of road surface deflection measurement, in particular to an excitation type road surface deflection tester. Background technique [0002] So far, more than 60 countries and regions in the world have applied the Falling Weight Deflatometer (FWD for short). my country began to introduce FWD in the late 1980s, and its development and application technology research has also received more and more attention. The traditional trailer-type FWD lifts and releases a heavy hammer through a hydraulic system controlled by a computer, thereby applying a pulse load to the road surface. The size of the load is changed by changing the weight of the hammer and the lifting height. The loading range is between 0.7t and 12t. It matches the early investigation results of traffic load in my country, but considering the current situation of overloaded or heavy-duty traffic characteristics in my country (the proportion of vehicles with a sin...

AI Technical Summary

Problems solved by technology

The traditional trailer-type FWD lifts and releases a heavy hammer through a hydraulic system controlled by a computer, thereby applying a pulse load to the road surface. The size of the load is changed by changing the weight of the hammer and the lifting height. The loading range is between 0.7t and 12t. It matches the early investigation results of traffic load in my country, but considering the current situation of overloaded or heavy-duty traffic characteristics in my country (the proportion of vehicles with a single-axle axle load exceeding 13t is increasing), this loading range is no longer representative. At the same time, limited by the material (such as density, etc.) and height of the weight, the increasing range of the loading force generated solely by the free fall of the weight is limited. 1t

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