Parallel steel wire finished rope stretching device with anti-twisting structures and anti-twisting construction method thereof

Abstract

The invention discloses a parallel steel wire finished rope stretching device with anti-twisting structures. The device comprises a stretching device consisting of a pull rope anchor head, an anchor cushion plate, support feet, a working nut, an inner bushing, a stretching rod, a jack and a stretching nut, and one or two anti-twisting structures; the anti-twisting structure I comprises a rotatingstop body, a rotating stop slide block and a guide base; the rotating stop body is fixed at a piston ejecting part of the jack; the guide base is fixed on a cylinder block of the jack; the rotating stop slide block is positioned between the rotating stop body and the guide base, and can move up and down along with a piston of the jack; a Huff nut of the anti-twisting structure II is screwed with athin Huff nut through threads of the stretching rod; one end of the rotating stop arm is fixed on the two sides of the Huff nut through screws; and the other end of the rotating stop arm is joined ona support foot stand column, and can slide along with ascending or descending of the stretching rod. The stretching device is adopted to implement an anti-twisting stretching construction method, canachieve the anti-twisting purpose of tools in the stretching or tensioning construction process of parallel steel wire finished inclined pull ropes, and achieves higher construction efficiency.

Description

technical field [0001] The invention relates to a structural component used in the field of prestressing and a construction method thereof, in particular to a tensioning device for a finished parallel steel wire cable with an anti-twist structure and an anti-twist construction method thereof. Background technique [0002] At present, the tensioning construction of the finished cable-stayed cables with parallel steel wires is completed by through-hole jacks. For "Finished cable-stayed cables with parallel steel wires", the actual internal steel wires are not parallel, but there is a twist of about 3º Due to the existence of the torsion angle, the stay cable will generate a reverse torsional force when it is stretched. After the torsion force reaches a certain level, it will be released at the tension end, and this force will drive the jacking of the tension jack. The device rotates together, damages the jack, and is also very prone to safety accidents. The above situation is...

AI Technical Summary

Problems solved by technology

[0002] At present, the tensioning construction of the finished cable-stayed cables with parallel steel wires is completed by through-hole jacks. For "Finished cable-stayed cables with parallel steel wires", the actual internal steel wires are not parallel, but there is a twist of about 3º Due to the existence of the torsion angle, the stay cable will generate a reverse torsional force when it is stretched. After the torsion force reaches a certain level, it will be released at the tension end, and this force will drive the jacking of the tension jack. The device rotates together, damages the jack, and is also very prone to safety accidents

The above situation is particularly prominent in the installation process of the super-long and super-heavy stay cables used in long-span bridges; at present, most of the on-site construction uses chain hoists to temporarily fix the jack cylinder to avoid the torsion of the cylinder body. When the torsional force is large, the jack piston cannot be avoided. reverse, and even cause personal injury to operators, therefore, it is necessary to propose systematic and effective anti-rotation solutions

Images