Stretching and anchoring device of single strand dragline under control stress for prestressing and installation method

Abstract

The invention discloses a device for tensioning and anchoring an individual thread guy cable under low tensioning control stress and a method for installing the same. The device comprises a small-diameter individual thread guy cable with both ends respectively provided with a heading, tensioning and anchoring devices of two tensioning ends and a plurality of middle anchoring devices, wherein the individual thread guy cable has a length which ensures that the guy cable can continuously pass through a plurality of stand columns; and each middle anchoring device comprises an inner circle, an opening sleeve matched with the outer circle of the individual thread guy cable, a collar, a locking bolt and a structure preventing the looseness of a clamp nut. The installing method adopts long cable tensioning and respective anchoring. The device and the method can substantially increase the length of a guy cable tensioning unit and save equipment along with simple installation construction, higher work efficiency and lower cost.

Description

technical field [0001] The invention relates to a tensioning and anchoring device and an installation method of a low-stress cable used for stairs or escalators, bridges or road wind barrier connections, and other landscapes or decorations, in particular to a monofilament under low tension control stress Tensioning and anchoring devices and installation methods for cables. Background technique [0002] Cables have been widely used in civil engineering. Cables are generally divided into two types, one is structural force cables, such as cable stays in bridge engineering, hanger cables and cables in curtain wall glass support structures. These cables are used as prestressed cables, and their tension control stress is generally 0.45f ptk ~0.75f ptk within range (f ptk is the standard value of the tensile strength of the cable material), so these cables are generally in a high-stress working state. Its tensioning device, anchoring device and its tensioning method (process) ...

AI Technical Summary

Problems solved by technology

[0008] 1. When the anchoring device in the middle section is connected by a misplaced tensioning unit, the length of the tensioning unit of the cable is limited, and the connecting anchor and its engineering quantity are increased. The installation process is cumbersome and the work efficiency is low, which not only increases the cost of equipment It also increases the labor cost and affects the appearance; and when the conventional cable connector is used to connect, the length of the cable tensioning unit is also limited, especially because the front and rear sections will affect each other during the cable tensioning construction. Therefore, multiple adjustments must be made to achieve the tension effect, which increases the construction time and difficulty. The installation process is also cumbersome, with low work efficiency and high labor costs; especially when the length of the cable is longer, that is, the tension When the number of units is large, the above disadvantages are more prominent

[0009] 2. When the fastening nut which is located outside the end column and used for tensioning and anchoring is tightened, the through-hole screw moves axially outward to make the steel wire tighten. The resistance is relatively large, so during the nut tightening process, the through-hole screw and the wire cable will be driven to a certain extent to rotate, which not only increases the torque of the wrench when tightening the nut, increases the difficulty of construction, but also easily changes the cable due to the torsion of the cable. The stress state directly affects the safety and service life of the cable

[0010] 3. Because the cable is under the low tension control stress, the cable is easy to loosen the fastening nut and the through-hole screw due to micro-seismic or other reasons, which leads to the failure of the cable connection, such as loose cable and no tension, etc., which directly affects the tension of the cable. normal use and safety of

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