Single stay tensing construction method and apparatus for parallel twisted steel stay system

Abstract

The construction process includes one single stay tensing step, in which tensing and push pressing seat, jack on the seat, continuous tensing part and tool anchor are used to tense to the designed tension before changing into working clamp sheet, tightening with tightener and once anchoring; and one push pressing step, in which tensing and pushing seat is used as backward force applying frame forthe synchronous pushing forward of the clamping sheet and the twisted steel stay. The tensing and pushing seat consists of 3-6 uprights, connecting rings, tensing and pushing board, pressure bearingring and limiting ring. The said construction method can avoid repeated tensing to result in inevitable hidden fault in anchoring and clamping quality and raise clamping effect and anchoring quality.

Description

1. Technical field: [0001] The invention relates to a construction method of a parallel steel strand cable system and an auxiliary tool used therein—a support for tensioning and pressing. 2. Background technology: [0002] The parallel steel strand cable system is a system in which the steel strand is used as the load-bearing cable body, based on the group anchor technology, and the group anchor clamp is used to bear the static and dynamic load of the structure transmitted by the cable. Steel strand stay cable system generally works at 0.30R b ~0.45R b Low stress area, sometimes only 0.1R during the construction phase b , so the anchoring efficiency of the anchor clamp is the key to ensure the normal operation of the steel strand cable in a low stress state. Parallel steel strand cable-stayed cables are generally produced and installed on site. In the process, the steel strands pass through the anchorage one by one, tensioned and pre-tensioned, and the initial stress is e...

AI Technical Summary

Problems solved by technology

When this process encounters long cables, the working clips will inevitably repeatedly clamp the steel strands. On the one hand, the clips and steel strands will be damaged to varying degrees; Chips and other fall off and accumulate in the gap between the teeth of the clip, affecting the anchoring effect

[0003] Secondly, the control of the dispersion (uniformity) of the single tension cable force of the parallel steel strand cable system is a key point of the parallel steel strand cable system. Construction, the method is to install a sensor on the first steel strand, and use the sensor change value to control the tension of other steel strands. Large, the multiple steel strands around the sensor cannot be stretched, only after the sensor is removed, it can be stretched, which is not conducive to the uniformity control of the steel strands

[0004] Third, the clamping force of the clip on the steel strand can be increased through the top pressure. In the current single-stretch construction, when the tension reaches the control stress, the steel strand can be used as the reaction force through the top pressure head to directly Pushing the working clip into the anchor hole has the following disadvantages: a. The clip does not move; b. The clip is pushed into the anchor hole, but it slips relative to the steel strand, so the steel strand and the clamp The clips will be scratched to varying degrees, and the clips will re-occlude, and they will be misaligned with the two bite marks on the steel strand, both of which will affect the clamping effect of the clips

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