Multi-hole tool anchor and prestress tensioning system of steel strands

Abstract

The invention provides a multi-hole tool anchor and further provides a prestress tensioning system of steel strands. The multi-hole tool anchor comprises an anchor plate seat body. A plurality of mutually-communicating cylinder bodies are arranged on the anchor plate seat body, tubular pistons are mounted in the cylinder bodies, and threading through holes are formed in the middles of the pistons.The prestress tensioning system of the steel strands comprises the multi-hole tool anchor. According to the multi-hole tool anchor and the prestress tensioning system of the steel strands, the multiple mutually-communicating cylinder bodies are arranged on the anchor plate seat body, in the use process, all the steel strands penetrate through the middles of power plugs, the power plugs are drivenby a cross-core jack to change the pressure intensity inside the cylinder bodies so as to push the pistons to move to achieve tensioning of the steel strands; the cylinder bodies mutually communicate, thus the pressures borne by all the pistons are completely the same, and thus it is ensured that tension stress on all the steel strands is consistent.

Description

technical field [0001] The invention relates to the field of bridge engineering auxiliary tools, in particular to a porous tool anchor and a prestressed tensioning system for steel strands. Background technique [0002] The tensioning of the prestressed beam is to use the prestressed tensioning machine to carry out tensioning when the concrete reaches a certain strength; the tensioning machine system generally includes hydraulic jacks, supporting high-pressure oil pumps, pressure gauges and external oil pipes, etc. Use with anchors. [0003] In recent years, prestressed intelligent tensioning heat has been set off at home and abroad; prestressed intelligent tensioning system uses intelligent tensioning system to automatically, synchronously and accurately tension the prestressed beam; it controls the tensioning oil pump and jack through the computer , using the measurement data feedback of the load cell and the displacement sensor to realize prestress synchronization and pr...

AI Technical Summary

Problems solved by technology

[0004] There are many patents for intelligent tensioning systems in China, but their structures are basically the same, including intelligent jacks, intelligent oil pumps, and control systems (independent or embedded); the jacks are in the form of integral tensioning, and each jack contains a set of For working anchors and a set of tool anchors, the tool anchors are used to anchor all the prestressed strands to be tensioned first, and then to be tensioned; the smart jacks and tensioning systems used in these patents are all tensioned in the whole bundle, and there is no correct After the prestressed steel strands are threaded into the bundle, tool anchors and clips are installed on both ends of the steel strands to perform prestressed tensioning of the whole bundle without adjusting the individual strands. The tension of the prestressed bundle will inevitably lead to uneven stress on the steel strands in the prestressed bundle; the uniformity of the initial stress of the prestressed bundle is not guaranteed, and it is easy to cause broken or slipped wires, which will affect the relaxation performance of the prestressed bundle and become an effective prestressed bundle. One of the main reasons for the excessive long-term loss; if the prestressed steel strands are threaded through the beam and the tool anchor is installed, then a single steel strand is used for pretensioning one by one with a jack, so that the initial stress can be uniform, but for The work efficiency is too low for a prestressed bundle composed of several or even dozens of steel strands; at present, there is no demand for integrated prestressed bundle tensioning of the whole bundle and equal force tensioning of the initial stress of each steel strand at home and abroad. Integrated prestressed tensioning system

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