Lifting jack used for drawing steel strand

Abstract

The invention relates to a lifting jack used for drawing a steel strand, and belongs to the technical field of infrastructural project equipment. The lifting jack comprises an oil cylinder and a supporting frame. The oil cylinder comprises a barrel, a piston and a piston rod, and the piston and the piston rod divide the barrel into an oil inlet cavity and an oil return cavity. The piston rod is provided with a first through hole in the axial direction. A base is provided with a second through hole. The other end, extending out of the barrel, of the piston rod is in fixed connection with the supporting frame through a rapid dismounting and mounting structure. A sleeve pipe is fixed to the base, one end of the sleeve pipe is inserted into the second through hole to form a seal, and the other end of the sleeve pipe is inserted into the first through hole to form sliding matching and mutual sealing. The supporting frame and the sleeve pipe are internally fixedly provided with a front tool anchor and a rear tool anchor correspondingly. The lifting jack reduces the unit weight carried by workers each time, so that the workers can conduct convenient manual operation on site. Meanwhile, the size of the whole device is reduced, an anchor cable is exposed out only by 30 cm instead of 1 m in the past to meet the requirement, and the requirement of on-site construction is met.

Description

technical field [0001] The invention relates to a device for drawing steel strands, which belongs 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, and are left in the concrete or rock soil layer after use (the length can reach 20-30 rice). In this way, not only waste materials, but also form an obstacle to the construction of adjacent buildings, and the prestressed tendons need to be recycled. [0003] In order to realize steel strand recovery, the patent No. ZL201120317074.X applied by the applicant is a jack for automatically pulling steel strand. When the device clamps the steel strand through the movable clamping part, the fixed clamping part releases the steel strand. Stranded wire, the piston can move outward in the oil cylinder to drive the movable clamp...

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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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