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RE: Knock-out Panel

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We often have batteries of tanks where we will add additional tanks later.  We extend the reinforcing bars beyond the area to remain enough to make lap splices or mechanical splices depending on the bar diameter.  The the area to be removed later is then designed with weak concrete (2000 psi or less) which also covers the extended bars.  This weak concrete is then easily chipped out when the expansion is done.  You may need to add steel stiffeners which will be removed later if the opening is to large.
 
Acie Chance
-----Original Message-----
From: Rich Lewis [mailto:seaint02(--nospam--at)lewisengineering.com]
Sent: Monday, May 23, 2005 8:19 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Knock-out Panel

I don’t think precast panels would be practical.  This is a below grade foundation wall that needs a future opening into the basement area.  The remaining structure is all cast in place.

 

Rich Lewis

Lewis Engineering

 

 

-----Original Message-----
From: Kestner, James W. [mailto:jkestner(--nospam--at)somervilleinc.com]
Sent: Monday, May 23, 2005 9:57 AM
To: seaint(--nospam--at)seaint.org
Subject: RE: Knock-out Panel

 

How about using precast panels with rubber membrane membrane waterproofing?

 

Jim K.

-----Original Message-----
From: Rich Lewis [mailto:seaint02(--nospam--at)lewisengineering.com]
Sent: Monday, May 23, 2005 8:22 AM
To: seaint(--nospam--at)seaint.org
Subject: Knock-out Panel

I am designing a concrete basement wall that is to have a knock-out panel for a future opening.  I would appreciate any suggestion on the best way to detail this to ensure waterproofing and ease of demolition in the future.

 

Thanks.

 

Rich