One Systems Natatorium - Manual (Page 20)

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The required hole size is 1/2 inches (12.7mm). Drill completely thru the concrete
block. Use a rotary drill only! (One Systems does not supply this 1/2” masonry drill)
NOTE: Avoid drilling into rebar. Rebar locators may be rented from
many sources to determine the location of rebar in the concrete block.
IMPORTANT NOTE: THE HOLE MUST BE DRILLED STRAIGHT. INSURE THAT
THE HOLE IS NOT DRILLED AT AN ANGLE. THE NORD-LOCK WASHERS AND
NUTS MUST BE FLAT AND PARALLEL WITH BOTH THE U BRACKET AND
BACKING PLATES FOR THE NORD LOCK WASHERS TO FUNCTION
PROPERLY. INSURE THAT THE HOLE IS NOT DRILLED AT AN ANGLE!
Consult with someone with experience drilling into grout filled block walls!
The location of the holes in the blocks (one per side) is shown below. The two holes
shown per side only represent the allowed mounting locations. ONLY one hole
per side should be drilled!
NOTE: Please note the location of the bracket relative to the structure of the blocks.
The 1/2” mounting holes (only one per side) must NOT be drilled between the
blocks. Insure that the holes are drilled in the block “cores” only and away from the
block vertical members!
Please note in the image above how the 112/NAT U-bracket spans across 3
individual concrete blocks. The dashed lines represent the internal structure of the
individual blocks. Only drill the holes in the “core” areas as shown above!
NOTE: It is critical to note the location of the U-bracket relative to the
individual blocks when mounting the 112/NAT.
When tightening the nuts a torque of 21 ft. lbs (28.5Nm) should be
used.
When turning the nuts turn both nuts in order to close the cams on both
washer pairs before tightening to minimize settlements. KEEP BOTH NUTS
SECURED WHILE TIGHTENING!
NOTE THE APPROXIMATE LOCATION OF THE BACKING PLATES ON PAGE 21.