3.11
SEMIFLUSH AIRFIELD AND HELIPORT LIGHTS
Water, debris, and other foreign substances shall be removed prior to
installing semiflush light base and light. Positioning jigs shall be used
to hold the light bases and/or lights to ensure correct orientation and
leveling until the concrete, adhesive, or sealant can provide permanent
support.
3.12
WIRES, FIXTURES, AND ENCLOSURES IN SAW KERFS AND DRILLED HOLES
3.12.1
Holes for Light Fixtures
Holes shall be bored in existing pavement to the dimensions indicated with
a diamond-edged bit to provide a smooth, straight cut. Bottom of hole
shall be flat or slightly concave, except that an area at least 25 mm 1 inch
wide around the perimeter shall be flat. Surfaces deeper than the
prescribed depth shall be filled with sealant to the level of the flat area
and allowed to cure before further placement.
3.12.2
Holes for Transformer Enclosures
Holes shall be drilled or excavated through concrete pavement and loose
material removed. Hole shall be filled with concrete to depth indicated.
A minimum of 75 mm 3 inches of concrete shall be provided at bottom of hole.
3.12.3
Saw Kerfs and Splice Chambers
Saw kerfs and splice chambers shall be cut in pavements where indicated.
Saw cuts shall be in straight lines with vertical sides. Width and depth
of saw cuts shall be adequate for the required number of wires. Saw kerfs
shall have the vertical edges chamfered at intersections. Where a saw kerf
crosses a construction joint, the depth shall be increased sufficiently to
allow for slack wire under the joint. The wire shall be enclosed in
flexible tubing which extends not less than 600 mm 2 feet each side of the
joint.
3.12.4
Sandblasting
Saw kerfs, grooves, and holes shall be sandblasted to remove foreign or
loose material. Sandblasting shall use approved equipment maintained in
good working order. Sand for blasting shall be proper size and quality to
perform the work. Nozzles for sandblasting shall be of the proper size in
relation to the groove or holes to be cleaned. Nozzles enlarged by wear
shall be replaced as necessary. Sandblast air pressure shall be not less
than 621 kPa 90 psi.
3.12.5
Cleaning
Immediately prior to installation of wire or light fixtures, saw kerfs and
holes shall be flushed with a high velocity water jet or steam, and then
cleaned and dried with a high velocity air jet to remove dirt, water, and
foreign material.
3.12.6
Lighting Fixture Installation
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NOTE: The designer should provide details on the
project drawings showing the installed light fixture
with reference to the finished pavement.
SECTION 16526A
Page 37
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