Backman beam deflection detecting instrument （ pavement deflection value measuring instrument, falling weight deflectometer, deflectometer models）

A ） technical requirements

The 1deflection measurement range:0-10mm

Measuring accuracy:2± 0.01mm

3 Beckman Leung length:5.4m

4lever ratio:2:1

5main parts material requirements:

（1） aluminum probe beam and measuring head is made of aluminum, with ZL401, GB1173-74" aluminum alloy mechanical properties".

（2） the middle shaft sleeve adopts45 steel GB699-65" quality carbon structural steels".

6assembly requirements: flat, before and after the lever is connected firmly, no loose phenomenon, the whole range of length, the unevenness of the each respect should be less than 2mm.

7appearance: instrument color is orange, to facilitate reflective, avoid the influence of temperature, the painted surface shall be smooth, uniform color, paint layer with no leakage painted, wrinkling, scratch and shedding, the dial gauge holder should be electroplating, plating plating without spot, bubble betrays a confidence and scratch phenomenon.

Two） required to complete the following experimental items or request

Determination pavement rebound deflection value, in order to assess the overall strength of the road of an apparatus, suitable for the determination of various pavement deflection, to evaluate the pavement bearing capacity or the pavement structure design to use, is also suitable for road construction in the process of compaction degree deflection test. Pavement deflectometer used to measure the vehicle load, subgrade, pavement deflection, auto rear wheel clearance at the center of the maximum deflection and the maximum rebound deflection.