Issue of matching the diameter of foundation bolts with the diameter of the skirt base

For towers, the diameter determines the required number of foundation bolts, primarily to ensure the feasibility of civil engineering construction. As for the specifications of the anchor bolts, they cannot be specified. The specific dimensions depend on factors such as the equipment load, wind load, seismic load, and eccentric load. For the same equipment, the specifications of the foundation bolts may vary in different locations; moreover, the calculation results differ even for components with the same diameter but different heights. Take a good look at the tower equipment standards.

Thank you for the reply from the friend on the second floor. Perhaps I didn’t explain my question clearly enough. What I mean is that for a tower 1 meter in size, the software suggests using M90 anchor bolts; is this reasonable? Do I need to change the base of the tower to a conical shape? The number of bolts used is determined according to standards.

Oh, I see what you mean. Whether it is necessary to change it to a conical shape may vary depending on individual opinions. By changing the structure to increase the diameter of the foundation bolts, it is possible to increase the number of bolts, which is also a good approach. I have seen the same type of equipment, designed by two different companies; one uses a cylindrical skirt, while the other uses a conical skirt. It’s also impossible to say who is right or wrong; as long as the strength requirements are met, that’s sufficient. It should be noted, however, that such a large diameter as that of the M90 implies extremely high combined bending moments; in this case, factors such as the effects on internal components like trays, eccentric loads, equipment ladders, and eccentric loads associated with large pipe connections all need to be taken into account. A larger margin can be left for the anchor bolts; never sacrifice too much for too little.

Consider raising the material standards for bolts to increase their strength.

Thank you so much! :handshake

The bolts are already Q345R

1 meter in diameter – how tall is that tower? It’s not specified~~~~ Bolts made of 16Mn are already used; it’s a quite high specification, and higher grades are also available, but they’re not commonly used~~~~

1 meter in diameter – how tall is that tower? It’s not specified~~~~ Bolts made of 16Mn are already used; it’s a quite high specification, and higher grades are also available, but they’re not commonly used~~~~