I'm just researching for a better solution and resource than what i currently have. Ideal for precast hollow-core plank and post-tensioned concrete slabs Cracked concrete tested alternative to a mini dropin anchor Redesigned ANSI carbide stop. I DO understand the proprietary reasoning behind the low values. Hilti screen-tube sleeve anchors with threaded rod and epoxy. Tapcon / concrete / masonry screws which have a low tensile value for hollow core material. In general, ONE failure is typically enough! Any comments on this? Has anyone else had this complaint? The allowable tensions for drop-ins are better than most anchors for hollow core, BUT, i've stayed away because of ONE complaint.

That was years ago and i will need to re-investigate that with more than one site foreman. Rawl / Powers / Simpson Drop-ins which actually have a 'better' allowable tension, but, the main contractor i have been working with complains that the drop-ins tend to spin within the material. This does not make it practical to specify an anchor in the office to obtain state approval.ĭoes anyone have a dependable and satisfactory method or anchor manufacturer to recommend?Īmong others that i do not recall at this time, I've specified the following: On-site testing is required to determine the actual performance of the anchor. Therefore, how can i specify an anchor with such a waiver? Can we interpolate the values? And if so, the result would be that much lower.ģ. Spancrete specifies its concrete to be 5,000 psi. The tabulated allowable loads are for anchors installed in hollow core concrete with a minimum compressive strength of 7,000 psi. Problem was the job was built with 3000psi CMU resulting in compression failure of the brick at every floor line. It has been over 12 years where one project in NYC had hollow core plank specified on 5000PSI CMU block walls. The allowable loads are very low to accomplish the necessary load.Ģ. Hollow Core Plank Retrofit anchor solutions. There are a variety of anchors for hollow core material applications to CMU, brick, plank and panel.ġ.

Anchoring to hollow core plank