3.3
BLOCK INSTALLATION
All placement of blocks shall be in accordance with the manufacturer's
recommendations and the Contractor's approved shop drawings.
3.3.1
Placement of Pre-Assembled Mattresses
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NOTE: The spreader bar may be deleted where
tolerances are a minor concern. The spreader bar
may have associated cost when placing one end of the
mattress in water, due to work in disconnecting the
rigging on the wet end.
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[Placement of pre-assembled mattresses shall be done with mattresses
attached to a spreader bar to aid in lifting, aligning and placing the
mattresses. ]The mattresses shall be placed directly into position, with a
maximum space or gap between mattresses of 75 mm 3 inches in excess of the
nominal joint spacing of blocks within the mattress. Mattresses out of
alignment shall be lifted and reset. Mattresses shall not be pushed or
pulled laterally after they are in contact with the geotextile. No
overlapping of mats will be accepted and no blocks shall project vertically
more than 25 mm 1 inch beyond the adjacent blocks. [As adjacent mats are
placed, they shall be secured to each other by fastening the protruding
horizontal and vertical cable connections and end cable loops together
along each side of the mats.]
3.3.2
Hand Placement of Interlocking Blocks
Hand placed blocks shall be spaced to maximize the ACB ability to
articulate. The Contractor shall use adequate alignment control, such as
string lines, to keep the block pattern in alignment and the joint spacing
consistent and uniform. Initially, no more than two working block rows
shall progress simultaneously in the direction of placement. Additional
working rows may be added after experience shows that true lines are
maintained. The starting position for ACB placement shall be a convenient
location for control of the block pattern alignment. The Contracting
Officer shall approve of the starting position for placement of the ACB.
3.3.2.1
Target Joint Spacing
Interlocking blocks shall be installed with a uniform aperture in the
interlocking connections. The target joint spacing shall be neutrally
spaced with equal free-play for the joint to open and close.
3.3.2.2
Correction of Joint Spacing
If the block pattern becomes skewed to an extent that blocks bind, joints
close, or blocks stickup, then the placed ACB that is determined to be out
of tolerance shall be removed and replaced. Where the nonconformance of
the joint spacing is due to project features, such as warped slopes or
anchor trenches, then cast-in-place concrete joints shall be field located
in concurrence with the Contracting Officer.
3.3.2.3
Maintenance of Joint Spacing
If the block pattern becomes skewed to an extent that the joint freeplay is
not acceptable to the Contracting Officer, then cast-in-place concrete
SECTION 02382
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