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Re: Cracks in Blocks in Fire Tower

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Hello Gary,

Photos would be helpful to see the exact nature of
damage and the constructed building. 

If there is corrosion, as Nels has suggested, it will
be most likely be evident on visual inspection of the
remaining part of the bolts, or the surrounding
concrete area.  Some discolorization or expansion of
surrounding area can indicate this.  

In my opinion, radial cracks can be due to the
application of a large 'pull out' force.  How is the
training conducted?  The answer may give an idea of
the cause of the radial cracks.  

For new anchorage, significant repair measures  may be

-Chitra Javdekar 

Approximately 10 years ago, I designed a 4 storey fire
training tower 
for the City of Niagara Falls.  The construction was
8" reinforced 
block with a 42" high parapet.  In the parapet I
embedded 5/8" eye 
bolts to be used for anchoring rapelling ropes for
climbing down the 
tower.  Almost every one of theses bolts has radial
cracks around the 
bolt shank circulating out 2" to 4".  The fire
department cut off the 
eye bolts to stop their use.  There are still U bolts
in the roof 
slab so they can still train.  However, they want to
have the eye 
bolts or an equivalent re-installed in order to have
different means 
of anchoring for training.  I guess not all buildings
are the same.  

Does anyone have any suggestions as to the cause of
the cracks in the 
block or alternative means of anchorage to the parapet
wall?  Photos 
are available if anybody's interested.

Gary Hodgson
Niagara Falls, ON

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