Tower equipment installation
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When embedding the foundation bolts for the tower equipment, no base ring was used, resulting in very poor accuracy of the bolts. During installation, the holes in the equipment did not align with the foundation bolts. What should be done? Everyone in the factory is very anxious; the equipment weighs over 200 tons.
A equipment base of over 200 tons is quite large; if it’s not possible to adjust the foundation bolts, should we consider adjusting the equipment’s foot hole? Of course, this would require the approval of the chief engineer
This post was last edited by Yanmen Guan Wai on 2009-11-4 at 12:17. Ugh~~~ The larger the equipment, the more necessary it is to use templates for the foundation bolts~~~! How can this be done~~~ How large is the error? ? If the error is not too large, slightly heat the bolt with fire and tap it to see if it can be corrected; if that doesn’t work, then the base ring and the bolt seats will have to be replaced. . . Sigh~~~ Let this serve as a lesson. In the past, when we installed a tower weighing over 30 tons, we requested that formwork for the foundation bolts be made; we even prepared drawings and emphasized repeatedly the necessity of doing so. On the day when concrete pouring started, I was very worried, so I took a train for several hours to get to the site. By then, the formwork hadn’t been made yet, and the concrete pouring had already been completed. I got angry and asked their construction team to dig through the concrete, but they refused; so I went to knock on the door of the person in charge from the client side overnight. Later, the construction team had to dig it open, and I supervised them on-site as they built the formwork; when we lifted the base and the tower structure, they fit together almost perfectly. . .
This device is already quite heavy; it’s necessary to determine whether anchor bolts are needed. Devices that are short and bulky don’t require them, as anchor bolts serve only a fixing purpose. If foot bolts really need to be added, there’s no choice but to plane the foundation. If the seismic force can be withstood, chemical anchors can be added on top of the existing foundation.
It’s not a big deal; just cut out the holes in the tower skirt base using a cutting torch.
Upstairs, that 200-ton tower – do you know how many bolt holes need to be cut? What should be done if the hole is not correct after it has been lifted by the crane? Is it really that simple, just a few cuts and welds? It is necessary to actually measure the deviation for each bolt, and it must be ensured that none of these bolts are misidentified; getting one wrong can cause big problems. . It’s not as simple as using CAD for drawing; what if, after cutting it, when the crane tries to lift it, it turns out that it still can’t be lifted? What should be done in that case? Cut again? For large towers, the best approach is to carry out construction on site. After the foundation is prepared, the bolts are custom-made on site according to its specifications; either the holes for the foundation ring bolts are made slightly larger, or the bolt seats are prepared first without being welded, and then welding is carried out on site once the foundation rings are joined together.
This post was last edited by RichardChan on 2009-11-5 20:59. It’s not a big problem. Such deviations are not necessarily due to problems with the foundation side (of course, in this case it’s clear that if the foundation side hasn’t built the model, then it’s definitely a problem with the foundation). Manufacturing and the foundation side are two separate entities, and deviations on either side are within acceptable limits; even if one side has a positive deviation while the other has a negative one, it’s still not possible for them to intersect. In such cases, the installation team simply needs to make slight adjustments depending on the situation. Check what the overall deviation is; if it’s small, follow what the people above suggested and use a cutting tool along with heat to adjust it (of course, this is only possible with the owner’s consent), then use a hammer to strike in the opposite direction in order to correct the deviation. Or make the bolt holes a bit larger. Example: In August, the same problem arose during the installation of a 150-ton reactor; it was simply a matter of deviations in the foundation and manufacturing processes. Lift the equipment above the embedded bolts, inspect the surrounding area, and mark the bolts that need adjustment, as well as the offset distance and the direction of hammering. Bake with a cutting tool, hammer, measure, then hammer again until lifting is successful.