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Stretching jack

A technology for tensioning jacks and cylinders, applied in the direction of lifting devices, etc., can solve the problems of high cost of the prestressed tendon tensioning system, large anchor holes of the tensioning system, and long working length of the tensioning bars, etc. Small stress loss and small shrinkage

Active Publication Date: 2008-02-20
CHINA RAILWAY 23RD CONSTR BUREAU LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Embodiment Construction

[0024] As shown in Figure 1-3, a tension jack includes a cylinder body 6, and one end of the cylinder body 6 with a support 10 is connected with an end cover 14, which is convenient for installing parts in the inner cavity of the cylinder body, and the other end of the cylinder body 6 passes through The bearing is connected with a large gear 13, one end of the large gear 13 has a sleeve, and one side of the large gear 13 is provided with an intermediate wheel 18 meshing with it. The end of the gear shaft 7 with a square head is installed on the support 10, and the gear shaft 7 The other end of the pinion gear 3 is fixedly connected with the intermediate wheel 18, and the pinion gear 3 meshing with each other, the intermediate wheel 18 and the large gear 13 are installed in the gear box 2, and the gear box 2 is connected by a hexagon socket. It is formed by connecting screws 17. The sleeve of the large gear 13 is fitted with a load-bearing sleeve 1, and the inner ring of the loa...

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Abstract

The invention discloses a tensioning jack, which belongs to the technical field of the jack. The invention comprises a cylinder body, and one end of the cylinder body is provided with a pedestal connected with an end cover, and the other end is connected with a bog gear with a sleeve through the bearing. The pedestal is provided with a gear shaft, and one end of the gear shaft is fixedly connected with a small gear, and the big gear and the small gear are respectively meshed with the medium wheel, and the small gear, the medium wheel and the big gear meshed with each other are arranged in the gear box. The cylinder body is provided with a nozzle tip communicated with the piston, and the cylinder body is provided with an observation window. The cavity of the cylinder body is the ladder hole, and the inside of the hole is provided with a piston rod, and the piston rod is sleeved with the piston. The connecting part for the piston on two sides of the nozzle tip and the cylinder body is provided with a sealing ring, and the piston is connected with one end of the pointer, and the other end of the pointer is positioned on the observation window of the cylinder body, and the cavity of the cylinder body is provided with a back spring. The invention is of material saving and time saving with high extension precision, which is the purpose-designed machine tool of the steel bar(PC bar) extension and screw anchorage locking used for the prestress concrete of the rail plate without fragment, and the similar short plate as well as the short beam.

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...

Claims

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Application Information

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IPC IPC(8): B66F3/24B66F3/25
Inventor 钱振地刘振民夏学成张国安罗兴友李运海叶友雄张雷徐振龙杨明辉周雪梅龚斯昆
Owner CHINA RAILWAY 23RD CONSTR BUREAU LTD
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