accumulation areas as indicated.
3.11
SEMIFLUSH HELIPAD 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 concrete, adhesive, or sealant can provide permanent support.
3.12
WIRES, FIXTURES, AND ENCLOSURES IN SAW KERFS AND DRILLED HOLES
Sealant is specified in paragraph Sealing Fixtures and Wires in Drilled
Holes or Saw Kerfs.
3.12.1
Holes for Light Fixtures
Holes shall be bored in existing pavement to the dimensions indicated using
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 one 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
Kerfs and splice chambers shall be saw 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 in flexible tubing under the joint.
3.12.4
Sandblasting
Saw kerfs, grooves, and holes shall be sandblasted to remove foreign or
loose material using approved equipment maintained in good working order at
all times. Sand for blasting shall be proper size and quality as necessary
to perform the work. Nozzles used 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). 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 cleaned
and dried with a high velocity air jet.
3.12.6
Lighting Fixture Installation
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NOTE: The designer shall provide details on the
project drawings showing the installed light fixture
SECTION 16525A
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