Combined multi-point deflectometer and method for measuring deflection

Abstract

The invention discloses a combined multi-point deflectometer and a method for measuring the deflection. The novel multi-point deflectometer which can be used for high-precision displacement measurement by a tee-joint water pipe leveling principle and a mechanical elastic deformation test principle comprises a plurality of soft water pipes and hard vertical tee-joint water pipes, wherein the soft water pipes and hard vertical tee-joint water pipes can be spliced at will and are mutually communicated; the hard water pipes are provided with bubbles to ensure that the test pipes are leveled during point testing; the ends of the soft water pipes and the joint sections of the hard water pipes are connected by joints which are easy to splice and have good water tightness; the hard water pipes can be lengthened by section; and an upper section is vertically provided with an elastic deformation gauge of which the lower end is provided with a floater from the top. According to difference before and after structure deformation, the water level in each hard water pipe arranged on the specific measurement point on the structure is still kept horizontal, change happens in the pipe relatively to the horizontal water level, the floater lifts or lowers, buoyancy borne by the combined multi-point deflectometer is changed to cause the reading of the elastic deformation gauge to change, and a reading precision is high.

Description

technical field [0001] The invention relates to a novel combined multi-point vertical deflection meter which can be used to measure the vertical deflection of a structure during a bridge load test and a method for measuring the deflection. Background technique [0002] At present, an important content in the bridge load test is the measurement of the deformation (deflection) of the structure under load, which reflects the stiffness characteristics of the structure. There are the following methods for deflection testing of bridges: [0003] 1. Level method or total station method. The principle is to pre-arrange several fixed measuring points on the structure, place one point on a fixed point of the structure or another point on a non-deformable point outside the structure, and then according to the principle of leveling, after each loading, use The elevation change value of each point is measured by the tower ruler, which is used to calculate the deflection of the structur...

AI Technical Summary

Problems solved by technology

The disadvantage is that if it is used for multi-point measurement, the system is bulky and heavy (using metal tanks and tubes), which is not easy to carry and costs high

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