Method for quickly aligning steel strands in tension construction of front-clamping jack and centring plate

Abstract

The invention discloses a method for quickly aligning steel strands in tension construction of a front-clamping jack and a centring plate. The method comprises the following steps of: (1) firstly compositing a centring plate and a limiting plate for tension and then carrying out hole alignment operation on the steel strands, wherein the centring plate is arranged on the outer side, has a round platy structure and is provided with holes corresponding to holes in the limiting plate for tension, conical guide devices are arranged outside at least two holes in the centring plate, and the outer diameter of the centring plate is less than the inner diameter of a transition sleeve for tension; (2) after the hole alignment operation is completed, moving the limiting plate for tension and the transition sleeve for tension onto a working anchor ring, fixing the limiting plate for tension and the transition sleeve for tension, and keeping the centring plate at the outermost ends of the steel strands; and (3) after a tool anchor ring in the jack is put in place, moving the tool anchor ring outside the centring plate, and directly pushing the jack in to carry out perforation operation on the steel strands after the conical guide devices on the centring plate correspond to the holes in the tool anchor ring.

Description

technical field [0001] The invention relates to a quick alignment method of a steel strand and a tool anchor ring during prestressed tensioning construction by using a front clip jack, and belongs to the technical field of prestressed construction. The invention also relates to a centering plate used in tensioning construction to ensure rapid alignment of steel strands. Background technique [0002] Existing prestressed products are basically prestressed and stretched by ordinary through-hole jacks. Take the 32-meter prestressed simply supported T-beam of the railway as an example, the exposed length is at least 700mm, and this part of the steel strand needs to be cut off after the tension is completed. line, causing a lot of waste. In response to this defect, some manufacturers have developed a front clamping jack, which embeds the anchor ring of the tensioning tool into the inside of the jack, so that the blanking length of the steel strand is generally less than 400mm, w...

AI Technical Summary

Problems solved by technology

[0002] Existing prestressed products are basically prestressed and stretched by ordinary through-hole jacks. Take the 32-meter prestressed simply supported T-beam of the railway as an example, the exposed length is at least 700mm, and this part of the steel strand needs to be cut off after the tension is completed. line, causing a lot of waste

In response to this defect, some manufacturers have developed a front clamping jack, which embeds the anchor ring of the tensioning tool into the inside of the jack, so that the blanking length of the steel strand is generally less than 400mm, which has brought great savings to the project cost. But the following problem is that after the cutting length of the steel strand is shortened, the alignment of the tool anchor ring moves forward to the front end of the jack. Due to the short distance, the general line of sight is poor, resulting in the front clamping of the jack steel strand and the tool anchor. There is a big obstacle in the alignment of the ring, resulting in prolonged alignment time and reduced work efficiency, which hinders the promotion and application of the front snap-on jack

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