Concrete strainmeter subassembly and installation method

Abstract

The invention relates to construction and especially relates to a subassembly for fixing a strainmeter in concrete, and an installation method. The invention discloses a subassembly for fixing a strainmeter in concrete and an installation method aiming at solving the problem of inaccurate measurement data of strainmeters in the prior art. The concrete strainmeter subassembly comprises a strainmeter and fixing rebars. The strainmeter comprises wafers, a force transferring rod, and a strain sensor. A fixing device is arranged between the strainmeter and the fixing rebars and is used for fixing the strainmeter on the fixing rebars. The fixing device is arranged on the strainmeter and makes the wafers of the strainmeter and the force transferring rod keep in an indirect contact status; the fixing device comprises a fixing tube, one end of the fixing tube is connected with the strainmeter. A guide line, connecting to the strain sensor, of the strainmeter extends outward through the pipeline of the fixing tube. By installing the fixing device between the fixing rebars and the strainmeter and adjusting the outlet mode of the guide line, the influence of external factors is reduced.

Description

technical field [0001] The invention relates to construction, in particular to a component and an installation method for fixing a strain gauge in concrete. Background technique [0002] At present, the vast majority of concrete strain gauges in engineering are embedded strain gauges, that is, concrete strain gauges are buried in concrete or shotcrete structures, or bound to fixed steel bars to measure the strain of concrete. [0003] like image 3 , the current concrete strain gauge and the installation method of the concrete strain gauge, the strain gauge is bound on the fixed steel bar 7 through the cable tie 8, the disc 1 is in contact with the fixed steel bar, and the wire 6 is drawn out of the shell 5 through the outlet protection device 12. [0004] The way here is in actual engineering, when placing the concrete strain gauge, on the one hand, because the concrete strain gauge has no force point, it is easily disturbed when the concrete is poured or sprayed, and the p...

AI Technical Summary

Problems solved by technology

[0004] The way here is in actual engineering, when placing the concrete strain gauge, on the one hand, because the concrete strain gauge has no force point, it is easily disturbed when the concrete is poured or sprayed, and the position is easy to change, thus making the strain measured by the concrete strain gauge invalid , the accuracy and reliability of the monitoring data cannot be guaranteed; on the other hand, when the concrete strain gauge is bound to the fixed steel bar, the concrete strain gauge and the shotcrete The contact is not dense, and the measured value is easily affected by the strain of the fixed steel bar, which cannot reflect the real strain of the concrete

After the wire of the ordinary concrete strain gauge is drawn out from the middle shell of the strain gauge, the direction of the lead is not far away from the stressed part of the strain gauge, so the existence of the wire affects the actual measurement value of the concrete strain gauge

In summary, ordinary concrete strain gauges cannot reflect the real strain of concrete, which affects the judgment of monitoring personnel on the real stress and strain of concrete, and may lead to engineering accidents

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