Expansion amount measuring and presetting method and device for pi-shaped pipe expansion joints

Abstract

The invention discloses an expansion amount measuring and presetting method and device for pi-shaped pipe expansion joints. According to the technical scheme, a photoelectric distance measuring instrument and a corresponding distance measuring refraction plate are included, and an expansion and contraction adjustor is further included. The two ends of the expansion and contraction adjustor are connected with locking mechanisms through connecting supports correspondingly. The photoelectric distance measuring instrument is arranged on the connecting support on one side through a photoelectric distance measuring instrument base, and the distance measuring refraction plate is arranged on the connecting support on the other side. The device is simple, low in cost and high in precision. According to the method, operation is convenient, the installing number of the pi-shaped pipe expansion joints can be effectively reduced, the pipe system space is effectively saved, and the expansion amountmeasuring and presetting method and device are particularly suitable for expansion amount measuring and presetting during high-temperature and high-pressure pi-shaped pipeline constructing and repairing.

Description

technical field [0001] The invention relates to a method for measuring and presetting a pipeline component, in particular to a method for measuring and presetting the expansion amount of a π-shaped pipe expansion joint. Background technique [0002] In petrochemical and urban thermal systems, a large number of high-temperature pipes use various expansion joints to solve the problem of thermal expansion due to thermal expansion. Generally, corrugated expansion joints are mostly used in medium and low pressure heat and chemical pipelines. For medium and high pressure high-temperature pipelines, it is more economical and reliable to use π-type tubes for thermal expansion compensation, so this kind of π-type tube compensator is generally used in this case. Especially relative to various corrugated expansion joints, the preset expansion of π-type pipe compensators for medium and high pressure high temperature pipelines in the initial installation has been neglected. Generally c...

AI Technical Summary

Problems solved by technology

Generally considered according to the free state, the compensation amount is based on the elongation under pressure and temperature, and the compensation potential of the expansion joint has not been brought into play and utilized.

In addition, if simply and roughly stretched with external force, it may be overstretched, and the π-shaped tube is abnormally deformed, or it may cause problems such as difficulty in controlling the accuracy of the preset expansion amount, and large errors (in the millimeter range).

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