Spring return type ultra-short prestressed beam low retraction tension anchoring device and construction method

Abstract

The invention relates to the technical field of prestressed tensioning, and discloses a spring-returned ultra-short prestressed bundle low-retraction tensioning anchoring device and a construction method. The invention includes a working anchor, an outer sleeve, an inner sleeve, a jack and a tool anchor which are sleeved on the prestressed bundle in sequence. One end of the outer sleeve is symmetrically provided with a limit slot, the inner sleeve is arranged in the outer sleeve, and one end is connected to the outer sleeve. The outer surface of the working anchor is arranged in contact with each other, and the other end is provided with an end-sealing plate. The inner sleeve is symmetrically provided with an operating slideway on the cylinder wall, and an annular pressure block is slidably arranged in the inner sleeve, and the annular pressure block is away from the side of the working anchor. Locking slides are symmetrically arranged on both sides of the bottom surface of the locking slide, one end of the locking slide is fixed with the circumferential surface of the annular pressure block, and the other end extends horizontally outward along the bottom surface of the annular pressure block, and extends to the outside of the inner sleeve through the operating slideway. It is in contact with the outer sleeve and clamped; the inner sleeve is provided with a compression spring. The invention has simple structure and convenient operation, can prevent the clip from retracting, and effectively control the slippage of the prestressed bundle.

Description

technical field [0001] The invention relates to the technical field of prestressed tensioning, in particular to a spring-returning ultra-short prestressed beam low-retraction tensioning anchoring device and a construction method. Background technique [0002] With the maturity of prestressing technology, prestressing is widely used in the field of civil engineering. However, a large amount of engineering experience shows that when the conventional anchorage structure, conventional tensioning equipment and tensioning process are used for tensioning, simple clip retraction will occur during the tensioning process and the clip cannot be well synchronized with the steel strand. The sliding retraction caused by the retraction makes the loss of the short-bundle prestress during the stretching process as high as 20%-50%. [0003] Therefore, it must be improved to ensure the actual effective prestressing. For this reason, relevant scholars and units have researched and developed s...

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Problems solved by technology

[0005] The technical problem to be solved is: when the conventional anchorage is stretched, it is easy to produce simple clip retraction and sliding retraction caused by the clip not being able to retract synchronously with the steel strand, the tension loss is large, and the tension is large. Inefficient and less effective

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