![]() ![]() When I have seen their (static and dynamic) models of the skid.the support points are only the preload anchor points. I also think part of the problem is the manufacturer's models of this. Just eyeballing this 's predictably occurring well away from the preloaded anchors.and I think (putting aside possible bond issues for a moment) a decent amount of unbalanced force is responsible. Fortunately, this hasn't happened to me yet.but I'd like to avoid it. While we are on the topic of epoxy grouting.does anyone have a strategy to avoid this situation? I've seen a few times in the field where the epoxy grout pulled away from the concrete (or the bottom of the skid). Getting rid of those leveling nuts is the first step RE: Leveling nuts and shims with grout pads CrabbyT (Structural) 15 Jan 21 16:57 Grit blasted to bare steel in "white" condition and degreased just prior to grouting.Įven then the expectation of a 100% void-free grout fill is asking A LOT. I believe you will find The intructions for epoxy grout detail surface prep similar to a real epoxy joint. There are some pump bases whose designs are 100% wishful thinking.Įxpecting cementitious grout to "stick" to the underside of a steel plate is in my opinion beyond wishful thinking. Is the pump mounting surface machined flat? Is the pump base rolled from steel plate?ĭoes the pump manufacturer offer a premium engineered base designed with a top plate at least 1/2" thick and strategically placed welded structural steel ribs to support the pump properly without relying on (you) filling it with magic grout? Got some pictures of your pump bases from above and below, showing their construction and (I hope) welded reinforcement on the undersides, especially in the regions around the pump mounting bolts and leading to the anchor bolt locations? When the OEM's fantasy land base design fails to perform during vibration acceptance tests You will be the one who looks bad, and will be expected to "fix" it for free. What is the pump OEM's recommendation for leveling? If they condone leveling nuts on the anchor bolts below the pump base be very afraid. Something doesn't make sense or are there two sets of holes? One for anchorage and one for levelling? If two sets, abandon the threaded ones and use a double nut on the real anchor rod. Can you drill the holes out and use a levelling nut with a 1/2" neoprene spacer below and use the new anchorage to hold it in tension and the grout in compression? If you are concerned about transferring load to the anchor rods by means of the levelling nut. Quote (dik (Structural) Does the screw hole need to be threaded? What is the advantage? If threaded, the anchor rods have to be attached when the installed. The removal of levelling screw will not affect the area around and hardened grout. The void may be filled with epoxy and tapped hole may be closed with a short hexagonal headed bolt. It is true that the wrapping the leveling screw with duct tape to ensure that the epoxy grout will not adhere to it and the screw will be removed once the grout is hardened. RE: Leveling nuts and shims with grout pads r13 (Civil/Environmental) 1 Sep 20 14:59 IMO, you have two options either use levelling screw set up as shown on the picture or plastic levelling nuts. The following picture is copy and paste from the book The Grouting Handbook A Step-by-Step Guide for Foundationĭesign and Machinery Installation (Donald M. In order to justify this, the anchor bolt sahll be preloaded to a level, such that ,the concrete foundation will receive compression stress around tension strength or the preload shall overcome an externally applied cyclic load. İİİ= The ( pump mass + grout mass + foundation mass ) shall vibrate as a unique mass to minimize the pump vibration effects. This will hinder the loading of grout and tightening of the anchor nut will not be effective. İİ=The use of adjustment nut underside the baseplate for levelling purpose, is not a good idea. The use of plate shims for adjustment will hinder this concept. I =The grout shall support the equipment skid. I just want to remind some critical points for grouting of vibrating machinery for more than 50 HP. I copied and pasted my respond to thread407-462146: Pump grouting criteria? ![]() The use of levelling nuts under the baseplate is not acceptable for the vibrating equipment foundations. I understand the levelling nuts underside the baseplate for levelling purposes. ![]()
0 Comments
Leave a Reply. |