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Re: [SEAOC] Tiltup Retrofit Anchors[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)seaoc.org
- Subject: Re: [SEAOC] Tiltup Retrofit Anchors
- From: COEngineer(--nospam--at)aol.com
- Date: Thu, 7 Mar 1996 19:15:36 -0500
- Cc: Redita(--nospam--at)aol.com
The Covert Operations name has come up several times in this thread. Thank you to those engineers who have put the time into investigating and speicfying the best possible anchorage systems. LA City Division 91 (and others) specifically prohibit the use of expansion anchors for tension connections. However, the use of adhesive anchors like the Covert CIA-Gel 7000, and undercut anchors such as the Covert Operations Ductile Undercut (DUC) anchor are allowed. The DUC anchors transfer all of their load to the concrete by bearing on the undercut conical section at the bottom of the hole, similar to a cast in place bolt. Covert Operations Inc. has provided epoxy adhesive and ductile undercut anchors to many tilt-up retrofit projects throughout California. Our products have ICBO, LA City, MWD,and Caltrans approvals as well as approval from DSA in Sacramento. Dennis Wish wrote of the use of the Hilti Hit C-100 epoxy adhesive in solid base materials, and that Covert uses a similar adhesive. In fact, the Covert system uses an 100% solids, solvent free amine based epoxy. This is very different than the ester and urethane methacrylate systems used by Hilti (not epoxy). jlord(--nospam--at)ruthchek.com wrote about saponification of polyester/vinylester systems (Hilti and others) in this thread. The Covert system can achieve significantly higher capacities than the C-100 and HY-150 systems because of the numerous chemical advantages of true epoxies. Compare ICBO reports and see for yourself! Questions or requests can be directed to: Howard Silverman Covert Operations, Inc. E-mail: COEngineer(--nospam--at)aol.com Phone: 800-827-7229 ...
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