Jack for drawing strands

Abstract

The invention relates to a jack used for drawing steel strands, belonging to the technical field of infrastructure engineering equipment. The jack includes an oil cylinder and a bracket. The oil cylinder includes a cylinder tube, a piston that divides the cylinder tube into two oil inlet and oil return chambers, and a piston rod. The piston rod is formed with a first through hole along its axial direction, and the base is formed with a second through hole. The other end of the piston rod extending out of the cylinder and the bracket are connected and fixed with each other through a quick disassembly and assembly structure; a sleeve is fixed on the base, one end of the sleeve is inserted into the second through hole to form a seal, and the other end of the sleeve is inserted into the first through hole. A sliding fit is formed in the through hole and is sealed with each other; the front and rear tool anchors are respectively fixed on the bracket and in the sleeve. The jack reduces the weight of the single unit that the workers carry each time, so that the workers can carry out convenient manual operations on site; at the same time, it reduces the volume of the entire device. Originally, the exposed anchor cable was 1 meter long, but now only the exposed anchor cable is required to be 30 cm long. It can meet the requirements and meet the needs of on-site construction.

Description

technical field [0001] The invention relates to a device for drawing steel strands, belonging to the technical field of infrastructure engineering equipment. Background technique [0002] Prestressed tendons are widely used in existing prestressed concrete structures or geotechnical engineering structures. Prestressed tendons are usually used for one-time use, and are left in the concrete or geotechnical layer after use (their length can reach 20-30 Meter). In this way, not only materials are wasted, but also the construction of adjacent buildings is hindered, and the prestressed tendons need to be recycled. [0003] In order to realize the recovery of steel strands, the patent number applied by the applicant is a jack for automatically drawing steel strands. Stranded wire, the piston can move outward in the oil cylinder to drive the movable clamping part to pull the steel strand out; The holding part loosens the steel strand and moves inward with the piston to its initia...

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Problems solved by technology

[0004] However, the applicant found that the device has the following problems during actual construction and use: 1) The device requires the exposed anchor cable to be 1 meter long to meet the initial automatic pull-out requirement. However, the exposed anchor cable during construction is not the same, The anchor cable is often exposed and relatively short. At the same time, the device is a whole product, which is very heavy, and it is inconvenient for on-site workers to move; 2) The fixed and movable electronic control devices of the device can be controlled by the console. The clamping part clamps or loosens the steel strand, which makes the structure of the whole device complex and the work unreliable

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