A method for calibrating hydraulic jacks by using axial pressure steel pipes

Abstract

The invention discloses a method for calibrating a hydraulic jack in the technical field of civil engineering structure testing, which comprises the following implementation steps: making two short steel pipes with completely identical parameters; pasting vertical strain gauges in the middle of the steel pipes; on a long-axis testing machine, Carry out the axial compression test of a steel pipe to measure the force and strain of the steel pipe in the elastic stage; carry out the axial compression test of another steel pipe on the hydraulic jack to measure the force and strain of the steel pipe in the elastic stage; The correction coefficient of the hydraulic jack can be obtained by comparing the force of the steel pipe under the same strain in the elastic stage. This method uses the existing instruments and equipment to calibrate the hydraulic jack. This method utilizes the force characteristics of the steel pipe in the elastic stage, has the advantages of high measurement accuracy and accurate correction coefficient, and can meet the measurement requirements of building structure tests and actual engineering.

Description

technical field [0001] The invention relates to the technical field of civil engineering structure tests, in particular to a method for calibrating a hydraulic jack by using an axially compressed steel pipe. Background technique [0002] Hydraulic jack, also known as hydraulic jack, is a jack that uses a plunger or a hydraulic cylinder as a rigid jack. Simple lifting equipment generally only has a lifting mechanism for lifting heavy objects. Commonly used simple lifting equipment includes hydraulic jacks, pulleys and hoists. The jack consists of a shell, a large piston, a small piston, a wrench, a fuel tank and other components. The working principle is that the wrench moves up to drive the small piston upward, and the oil in the fuel tank is sucked into the lower part of the small piston through the oil pipe and the one-way valve. When plugged, the oil in the lower part of the small piston is pressed into the lower part of the large piston through the internal oil circui...

AI Technical Summary

Problems solved by technology

At present, there are two commonly used calibration methods: method 1, using a standard dynamometer to calibrate the jack is a relatively accurate method, but most units do not have this equipment, and it is not easy to popularize; method 2, using a testing machine to calibrate the jack It is a widely used method at present, but the specific methods are not consistent, and the verification results are quite different

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