Is it better to embed the anchor bolts directly or to use secondary grouting?
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Common practice: Secondary grouting is used for pump-type equipment, while direct burial is used for tower-type equipment. So, is it better to embed the anchor bolts directly or to use secondary grouting? ! What are their respective features, and what occasions are they suitable for: o
Take a look at this post: http://bbs.hcbbs.com/viewthread.php?tid=394549, especially posts 9, 10, and 11. This post was last edited by Pseudo Xiaobao on 2009-3-4 at 20:26.]
It is likely that moving equipment makes use of secondary grouting for foundation bolts, while large stationary equipment such as various towers and tanks uses foundation bolts that are embedded directly in place. Feature: The foundation bolts of operating equipment are all relatively small, and the strength provided by secondary grouting is sufficient to meet their requirements ； The anchor bolts for large fixed equipment are quite large, and secondary grouting does not provide a sufficient level of stability in such cases.
The advantage of directly buried foot bolts is that it facilitates adjusting the positioning dimensions of the foot bolts without the need to use formwork； The downside is that it is not stable enough. Therefore, for towers, taller containers, and equipment with significant vibration, direct-embedded foot bolts should be used. Secondary grouting refers to filling the gaps between the equipment base and the foundation surface, as well as the holes for the anchor bolts, with concrete or mortar. One of its functions is to secure the shims (the movable parts of adjustable shims cannot be solidified), and another function is to bear the load of the equipment. It generally requires that the upper and lower openings of the ground hole be sealed with a concrete layer about 10 centimeters thick, with sand filled in between; dried sand is preferred, and the purpose of this is to protect the anchor bolts located in the ground hole from severe corrosion. Asphalt tar is the best choice for sealing both ends.
Disagreements arose, with each side holding its own view: ordinary heat exchangers, horizontal vessels, vertical vessels, etc., are not considered large-scale equipment – so which one should be used? Please share your valuable opinions! ! ! :lol
Direct burial yields good results, but it requires a lot of effort. Secondary grouting is not recommended.
Foot bolts that require precise positioning use secondary grouting； For applications where the location requirements are not strict but high forces are applied, directly buried foot bolts are used.