with sealant to the level of the flat area and allow to cure before further
placement.
3.10.2
Holes for Transformer Enclosures
Drill holes through concrete pavement and remove loose material. Fill hole
with concrete to depth indicated. Provide a minimum of 75 mm 3 inches of
concrete at bottom of hole.
3.10.3
Saw Kerfs and Splice Chambers
Cut saw kerfs and splice chambers in pavements where indicated. Provide
saw cuts in straight lines and with vertical sides. Provide width and
depth of saw cuts adequate for the required number of wires as indicated.
Saw kerfs shall have the vertical edges chamfered at intersections. Where
a saw kerf crosses a construction joint, increase the depth sufficiently to
allow for slack wire under the joint.
3.10.4
Sandblasting
Sandblast saw kerfs, grooves, and holes to remove foreign or loose
material. Accomplish sandblasting by using approved equipment maintained
in good working order at all times. Provide sand used for blasting of the
proper size and quality as necessary to perform the work. Provide nozzles
used for sandblasting of the proper size in relation to the groove or holes
to be cleaned. Replace nozzles enlarged by wear as necessary. Sandblast
at an air pressure of not less than 0.62 MPa 90 psi.
3.10.5
Cleaning
Immediately prior to installation of wire or light fixtures, flush saw
kerfs and holes with a high velocity water jet or steam, and clean and dry
with a high velocity air jet to remove dirt and foreign material.
3.10.6
Lighting Fixture Installation
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NOTE: The designer shall provide details on the
project drawings showing the installed light fixture
with reference to the finished pavement.
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Sandblast sides and bottom of each light fixture immediately prior to
installation. Cover inside faces of bored hole and bottom and sides of
light fixture with a coating of sealant that will completely fill the void
between concrete and fixture. Use a jig or holding device for installing
each light fixture to ensure positioning to the proper elevation,
alignment, level control, and azimuth control. Orient light fixture with
light beam parallel to flight deck centerline or runway centerline and
facing in the particular direction required. Level outermost edge of
fixture with the surrounding pavement. Remove surplus sealant or flexible
embedding material. Leave the holding device in place until sealant has
reached its initial set. Properly arrange fixture lead wires with respect
to their connecting position. Block the wire way entrance into the light
recess to retain the sealant material during curing.
3.10.7
Installation of Circuit Wires in Pavement
Place the wires in saw kerfs and anchor at bottom by means of rubber or
SECTION 16522N
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