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Rectangular units should be layed in a herringbone
pattern to prevent "creep" under traffic, permitted by the
opening of joints. Other units may be laid in running or
stretcher bond as their interlocking design resists the forces
that cause "creep." Each paver is placed against the adjacent
units without disturbing the sand or other units. The order of
laying should be such that it is never necessary to force a
block between those already laid.
Where whole units do not fit at the edges of a pavement,
cut pavers are used to fill the spaces. Spaces left around
manholes and drainage inlets are treated in the same
manner. This is readily accomplished with a small hydraulic
block splitter. Spaces less than about 1-5/8" (40mm) can be
filled with sand.
After enough area is laid to make vibration worthwhile, the
pavers are vibrated to their final level with a plate vibrator.
The vibrating action compacts the sand and also forces some
sand up between the joints . After the initial vibration, sand is
brushed over the surface and is vibrated into the joints by an
additional two passes of the vibrator. This locks the pavers
together so that they no longer act as individual units but as
a group in distributing loads. Vibration also evens out any
minor variations in level between units. The vibrator should
not be passed closer than about one yard from an
unrestrained edge. After surplus sand is removed the
pavement is completed and ready for traffic. If heavy trucks
are used to deliver materials close to the work, the sanding
and vibration should be done before the trucks are permitted
to enter that section of the pavement.
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