Stretching jack

Abstract

The invention discloses a tensioning jack, which belongs to the technical field of jacks and comprises a cylinder body. One end of the cylinder body equipped with a support is connected with an end cover, and the other end is connected with a large gear with a sleeve through a bearing. The gear shaft, one end of the gear shaft is fixedly connected with the pinion, the large gear and the small gear mesh with the intermediate gear respectively, and the intermeshing pinion, intermediate wheel and large gear are installed in the gearbox; the cylinder is provided with a nozzle connected to the piston , There is an observation window on the cylinder body; the inner cavity of the cylinder is a stepped hole, and a piston rod is arranged in the hole, and a piston is set on the piston rod, and a sealing ring is provided on the connecting part between the piston and the cylinder body on both sides of the oil nozzle, and the piston is connected One end of the pointer and the other end of the pointer are located at the observation window of the cylinder body, and a return spring is provided in the inner cavity of the cylinder body; the invention saves material, time and has high tensioning precision, and is suitable for ballastless track plates and similar short The prestressed concrete of slabs and short beams is a special machine for tensioning with steel rods (PC rods) and locking with threaded anchors.

Description

technical field [0001] The invention relates to a jack, in particular to a special double-acting jack, which is mainly used for ballastless track slabs and similar short slabs and short beams (≤6 meters) and is suitable for prestressed steel rods for prestressed concrete. (PC steel rod) special machine for tensioning and threaded anchor locking. Background technique [0002] Existing tensioning jacks, tensioning prestressed tendons, and locking clip-type anchors have long working lengths of tensioning tendons, a lot of material waste, and high cost of the prestressing tendons tensioning system. Moreover, the anchor holes of the tension system are large, which is unfavorable for the concrete of the thin ballastless track slab, and it is difficult to seal the anchor. Contents of the invention [0003] Based on the defects of the prior art, in order to adapt to the locking of steel rod tensioning and threaded anchors for new prestressed concrete, the purpose of the present i...

AI Technical Summary

Problems solved by technology

[0002] Existing tensioning jacks, tensioning prestressed tendons, and locking clip-type anchors have long working lengths of tensioning tendons and a lot of material waste, and the cost of the prestressing tendon tensioning system is high

In addition, the anchor hole of the tension system is large, which is unfavorable for the concrete of the thin ballastless track slab, and it is difficult to seal the anchor

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