Corrugated pipe capable of measuring prestress

Abstract

The invention discloses a corrugated pipe capable of measuring prestress, which comprises a corrugated pipe main body used for protecting prestressed reinforcing steel; and one or a plurality of metal coils are wound on the corrugated pipe main body, an inductor and a capacitor are formed among the metal coils, and the prestressed reinforcing steel positioned in the corrugated pipe main body forms a magnetic core of the inductor. Before the prestressed reinforcing steel is tensioned, the inductance value, the capacitance value and the quality factor of the coils of the corrugated pipe in a prestressed component are measured firstly; and in the prestress tensioning process, the prestressed reinforcing steel is tensioned and stretched, and the self diameter is reduced simultaneously; the magnetic core of the inductor is changed due to change of the diameter of the prestressed reinforcing steel; meanwhile, the changed inductance value, capacitor value and the quality factor of coils can be measured again by a measuring instrument because the change of distances among the coils is caused by compression of concrete. By means of the corrugated pipe, the prestress can be calculated accurately through comparison of the numerical values measured twice.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a force-measurable prestressed corrugated pipe capable of accurately measuring the effective prestressing condition in a prestressing structure. Background technique [0002] In building construction, especially bridge construction, in post-tensioned prestressed concrete structures, the joint action between prestressed tendons and concrete, as well as the anti-rust and anti-corrosion of prestressed tendons are realized by filling cement grout in pre-buried tunnels. , the commonly used method is to pre-embed the bellows and pass the prestressed tendons through the bellows first, then apply force to the prestressed tendons through a tensioning machine and anchor them, and then pour cement slurry into the bellows, and finally make the prestressed structure contains prestress. [0003] The construction of the prestressed bridge girder body is divided into the following three stages...

AI Technical Summary

Problems solved by technology

At present, the control of the prestress size in the project is to record the tensile stress and elongation value of the construction tension during the second stage of the prestressed tendon stretching process, draw the P-S curve of the construction tension process, and pass the P-S curve To analyze whether the tension of the prestressed tendons is in place, and then after the prestressed tendons are stretched and anchored, the retraction of the prestressed tendons is estimated based on experience, and it is roughly judged whether the prestressed stress in the structure is qualified, and it cannot be accurately measured. Internal effective prestress condition

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