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Replace the lower bearing of the door machine with the jacking method (2)
Source: Bearing network time: 2018-04-12
| /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089'; |
When jacking up; two jacks out of sync will cause the door machine to reverse slightly skewed; but only the roller is not pushed out of the upper support ring raceway; some of the stability of the reverse connection will not be damaged. The upper support ring raceway The height of the roller is 140mm; it is considered from all aspects of construction; the maximum height of the jacking is set to 120mm; the 20mm is reserved for support; the stability after the jacking is adhered to.
After jacking; there is a distance of 15mm between the highest point of the middle line tube in the lower part of the lower bearing seat and the lowest point on the lower bearing seat (excluding the height of the inner raceway and the roller of the bearing); the inner raceway and the rolling of the bearing can be thoroughly carried out. Disassemble the lower part of the lower support seat; the height is 6mm; the distance is less than 15mm; the lower part of the lower support can be completely removed when needed.
After the jacking is in place; the wind effect can cause the upper part of the door machine to reverse; the top lifting point is moved; the top height is changed. In addition to the aforementioned stability method; the iron block is placed under the jacking bracket. The area of ​​the iron block is 200mm. ×150 (mm); thickness and thickness; fill the gap between the bottom of the jacking bracket and the cross beam according to the demand. This has the upper support ring support; the windproof pin and the iron block support; plus the windproof rope; The stable balance system after jacking up; the safety of construction is guaranteed.
3, the lifting support point of the reinforcement of the door machine reverse some of the gravity is 580kN, thinking about the wind and other elements; each jack receives a force of 300kN. Select YQ-50 jack; mass 43kg, lifting height 180mm; base scale 230mm × 188 (mm), which is supported on a 400mm × 300mm × 20 (mm) A3 steel plate;
The inclination of the inclined surface of the lower column is αarccos45°.
The straight top lift of the lower column slope is 300kN, and the positive pressure is the welding plate on the touch surface of the slanting column and the jacking bracket; to add its partial stiffness.
4, construction preparation 1) put the door arm frame down to the maximum undulation; use the chain hoist to tighten and lock. The top of the nose bridge is fastened with a windproof rope and fixed.
2) Remove the rotating planetary pinion.
3) Remove all the cables on the middle slip ring; if the line number is unclear;
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