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Re: HILTI Anchor for anchoring Vessels[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaint(--nospam--at)seaint.org
- Subject: Re: HILTI Anchor for anchoring Vessels
- From: "Robert Kazanjy" <rkazanjy(--nospam--at)gmail.com>
- Date: Fri, 17 Mar 2006 13:05:20 -0800
If you're interested in an undercut post installed US made anchor...................checkout
they've been around since the early 80's & have done extensive testing under all sorts of conditions
The only thing that kept me from using the HILTI were the limitations on
length and metric diameters. Covert custom makes anything you want. So for
a vessel you can still use your stiffened weldments at the base.
>To: < seaint(--nospam--at)seaint.org>
>Subject: Re: HILTI Anchor for anchoring Vessels
>Date: Fri, 17 Mar 2006 11:38:11 -0800
>If you are trying to stay with HILTI note that they have a self drilling
>mechanical undercut anchor called the HILTI HDA and comes in two styles;
>one as a pre-set type and the other as a through-set type. Call them or
>look up their catelog on the net.
>Thomas Hunt, S.E.
>"Harold Sprague" <spraguehope(--nospam--at)hotmail.com>
>03/17/2006 11:16 AM
>Please respond to seaint
>Re: HILTI Anchor for anchoring Vessels
>I have used a Covert "Ductile Undercut Anchor" post installed mechanical
>anchor rod and tensioned the anchor rods after installation.
>On the applications that I have employed, the bolts were checked after a
>week and showed no relaxation.
>I would advise against tensioning an epoxy anchor.
> > ----- Original Message -----
> > From: Padmanabhan Rajendran
> > To: seaint(--nospam--at)seaint.org
> > Sent: Friday, March 17, 2006 6:58 AM
> > Subject: HILTI Anchor for anchoring Vessels
> > A client wants to set a vessel (8' dia X about 55' tall) on an
> >2' thick, concrete mat, and anchor the vessel to the mat with 1" dia
> >epoxy grouted anchor rods. The tension and shear in the bolt is 11000 lbs
> >and 1000 lbs respectively. My scope of work is to determine the bolt
> >embedment depth. I understand that the bolt will be pretensioned after
> >vessel is installed.
> > I used the published values of nominal bolt loads, adjustment factors
> >for edge distance and bolt spacing etc. to calculate the bolt embedment
> >depth. One of the standard embedment lengths (12.375") is sufficient to
> >support the vessel.
> > What bothers me is that the post-installed epoxy anchors are not
> >approved by ACI 318 (See Appendix D for Scope of application) mainly
> >because the reliability of these type of anchors has not been certified
> >accordance with ACI 355.2. However, the published bolt values in HILTI
> >catalog have been certified, by ICC Evaluation Service, to conform to
> >1997, and 2000 IBC. The certification stipulates that it is valid only
> >the concrete is uncracked. The restriction stems from the fact that the
> >anchors were not tested in cracked concrete environment.
> > The current thinking in anchor bolt design is that the headed bolt, or
> >something similar, is the most effective anchor element. It is reported
> >that L- shaped and J-shaped bolt perform poorly, in comparison. If
> >and J-shaped bolts perform poorly, how can a straight piece (despite
> >threads) perform any better?
> > Is it possible to pretension an, un-sleeved, anchor bolt? Is it not
> >likely that concrete near the surface will crack?
> > Please share your thoughts and experiences, if any.
> > Thanks.
> > Rajendran
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