A test device and test method for studying the durability of prestressed concrete pressure pipes

Abstract

The invention relates to a test device for studying the durability of a prestressed concrete pressure pipeline and a method for using the same, belonging to the technical field of concrete equipment. The invention includes a tensioning mechanism and a maintenance and corrosion mechanism. The tensioning mechanism includes a first fixed beam, a second fixed beam, a movable beam, a pier-type pedestal and a pull rod; the first and second fixed beams and the pier-type pedestal surround a rectangular enclosure structure , the movable beam is connected to the first fixed beam through a pedestal jack, the tie rod passes through the first fixed beam, and the two ends of the tie rod are respectively fixed on the movable beam and the second fixed beam through anchors. The invention solves the problem that the durability test of the prestressed concrete pressure pipeline cannot be effectively carried out at present, and strongly promotes the development of the research on the durability life prediction of the underground pipeline.

Description

technical field [0001] The invention relates to a test device for studying the durability of a prestressed concrete pressure pipeline and a method for using the same, belonging to the technical field of concrete equipment. Background technique [0002] The working environment of pipelines is mostly underground. In areas with acidic groundwater and high clay soil, there is a large amount of SO in groundwater and soil. 4 2- , Cl - wait. According to the traditional corrosion damage mechanism of reinforced concrete structures, these ions will gradually penetrate into the interior of the concrete, react with cement hydrate, destroy the passivation film on the surface of the steel bar, and cause the steel bar to corrode, resulting in expansion and cracking of the concrete protective layer and adhesion between the steel bar and the concrete. The knot force is reduced, and even the steel bar is broken and damaged. When analyzing the failure reasons of prestressed concrete press...

AI Technical Summary

Problems solved by technology

[0003] However, at present, the research on the durability of prestressed concrete pressure pipes is very scarce at home and abroad, and a large number of researches are mainly focused on ordinary concrete structures, and a unified understanding of the stress corrosion mechanism has not yet been formed.

In terms of test technology and test equipment, many considerable achievements have been made in the research on the durability of ordinary concrete structures, which can achieve durability in various environments such as different temperatures, different humidity, alternating wet and dry, different pH values ​​and different ion concentrations. Performance research, but there is no relevant equipment to simulate the real service environment of prestressed concrete pressure pipes

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