This kind of maintenance and hoisting method is worthy of discussion!
Thread Content
The main body of the torch of a company's low-pressure gas venting system is 150 meters high. This year's overhaul requires the replacement of a torch head weighing about 3 tons. The hoisting height and high-altitude hoisting are relatively difficult. To this end, it took nearly two months to install a 160-meter overhead tower crane to hoist the torch head.
Do you think this maintenance and lifting method is worthy of discussion? @Fish in the desert
There is not enough space for crawler crane transfer and on-site assembly. It is 150 meters. Nowadays, many wind power generation hoisting is at this height. There is no problem with hoisting. The cost of helicopters is higher, so tower crane is the most reasonable way.
The hoisting of wind power generation uses crawler cranes. The cost of using a tower for two months is estimated to be higher than renting a crawler crane. The key is that the risk of tower hoisting is much higher than that of a crawler crane.
Although I am not professional enough, I think this lifting method is more reasonable. I quite agree with the analysis on the third floor. The crawler crane requires a relatively large space. ； Helicopters are actually more unsafe and are greatly affected by weather conditions. If there is no problem with the tower crane equipment, although it takes a long time, it is the safest and most reliable way.
No one understands: Without leasing rebates, the entry and exit costs of a 400-ton crawler crane are high. Assembly and disassembly takes about 10 days, 1-1.5w per shift, and the total cost is 10-15w. Not easy to rent. If there are other hoisting needs on site, it is cost-effective for the tower crane foundation construction to take 40 days and cost 40,000 yuan. This cost can be saved for the next maintenance and can be counted as fixed assets in the factory. Assembly + security inspection and dismantling are 15 meters per day, which is super high (1+2.5) times. The shift fee is 1k, and the total cost is about 8-10w. Easy to rent.
Hoisting at a height of 150 meters and weighing 3 tons requires at least a 650-ton crawler crane.
Using data from XCMG Group: https://www.xcmg.com/product/product/pro-detail-44228.htm Theoretically 125m * sin85°+auxiliary pole 84m * sin30°=167.52 meters. Meet the lifting height. There is no other lifting data, and it is unclear whether it meets the rated lifting weight (3 tons is not heavy, and the hook head weight is almost the same)
This kind of hoisting is already very good；
If it is just one hoisting, the crawler crane is faster； If you consider future maintenance, a tower crane is more reasonable. ； But for a project like this that only needs to be replaced every few years, it is more convenient to use a crawler crane. What I'm not sure about is whether the torch bracket can be used as a support for the tower crane?