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RE: New Steel to Existing Concrete

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You have already received good answers on post installed anchors.  I try my
best to avoid the problem by installing cast in place embed plates wherever
I find there is the slightest possibility of a steel beam attachment. 
Welding to an embed plate is a piece of cake as long as the embed plate is
about 6 inches bigger than it needs to be (construction tolerance).
Harold Sprague

-----Original Message-----
From: Robert Rollo [mailto:rrollo(--nospam--at)]
Sent: Wednesday, February 17, 1999 9:36 AM
To: 'seaint(--nospam--at)'
Subject: New Steel to Existing Concrete

every time we try to connect new steel beams to existing concrete columns or
beam, the driller will hit rebar despite all detailing and layout efforts to
the contrary.  obviously, upon hitting rebar, the contractor calls for
guidance, we attempt to determine adequacy of the member with interupted
reinforcing, etc. etc.

anyone have better solution to this age old delema ? short of don't connect
new steel to old concrete ? 

am i missing something so obvious it is slapping me in the face? 

can i prevent the phone calls next time ? or am i forced to accept this as a
universal constant ? 

thanks in advance for any thoughts . . . 

robert d. rollo, PE 
Corporate Associate 
(806) 747-0161vox 
(806) 747-7146 fax