Design and Construction Handbook - Los Angeles World Airports
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Design and Construction Handbook - Los Angeles World Airports

Design and Construction Handbook - Los Angeles World Airports

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Guide Specification<br />

3.4 MANHOLE AND HANDHOLE INSTALLATION<br />

A. Elevation: Install manholes with rooftop at least 15 inches below finished grade. Install<br />

h<strong>and</strong>holes with depth as required. Cast h<strong>and</strong> hole cover frame directly into roof of h<strong>and</strong><br />

hole <strong>and</strong> set roof surface 1 inch above grade. Place <strong>and</strong> align precast manholes to provide<br />

horizontal tolerance of 2 inches in any direction <strong>and</strong> vertical alignment with not greater<br />

than 1/8 inch maximum tolerance for 6 foot of depth. Completed manhole shall be rigid,<br />

true to dimensions <strong>and</strong> alignment, <strong>and</strong> shall be watertight.<br />

B. Drainage: Install drains in bottom of units where indicated. Coordinate with drainage<br />

provisions indicated. Sumps shall be knocked out at time of installation.<br />

C. Access: Install cast-iron frame <strong>and</strong> cover.<br />

1. Install precast collars <strong>and</strong> rings to support frame <strong>and</strong> cover <strong>and</strong> to connect cover<br />

with roof opening. Provide moisture-tight masonry joints <strong>and</strong> waterproof<br />

grouting for cast-iron frame to chimney.<br />

2. Set frames in paved areas <strong>and</strong> traffic ways flush with finished grade. Set other<br />

frames 1 inch above finished grade.<br />

D. Waterproofing: Apply waterproofing to exterior surfaces of units after concrete has<br />

cured at least three days. After ducts have been connected <strong>and</strong> grouted, <strong>and</strong> before<br />

backfilling, waterproof joints <strong>and</strong> connections <strong>and</strong> touch up abrasions <strong>and</strong> scars.<br />

Waterproof exterior of manhole <strong>and</strong> h<strong>and</strong> hole chimneys after brick mortar has cured at<br />

least three days. Seal manhole section joints with sealing compound recommended by<br />

the manhole manufacturer. Penetration into manholes <strong>and</strong>/or boxes shall be sealed.<br />

Provide conduit duct plugs for unused terminator openings of spare conduits in manhole.<br />

Do not water seal top removable cover until cable pulling has been completed.<br />

E. Damp proofing: Apply damp proofing to exterior surfaces of units after concrete has<br />

cured at least three days. After ducts have been connected <strong>and</strong> grouted, <strong>and</strong> before<br />

backfilling, damp proof joints <strong>and</strong> connections <strong>and</strong> touch up abrasions <strong>and</strong> scars. Damp<br />

proof exterior of manhole <strong>and</strong> h<strong>and</strong> hole chimneys after brick mortar has cured at least<br />

three days.<br />

F. Interior walls <strong>and</strong> ceiling shall be primed <strong>and</strong> painted with two coats flat white paint.<br />

G. Hardware: Install removable hardware, including pulling eyes, cable stanchions, cable<br />

arms, <strong>and</strong> insulators, as required for installation <strong>and</strong> support of cables <strong>and</strong> conductors<br />

<strong>and</strong> as indicated.<br />

H. Field-Installed Bolting Anchors: Do not drill deeper than 3-7/8 inches for anchor bolts<br />

installed in the field. Use a minimum of two anchors for each cable stanchion.<br />

I. Grounding: Install ground rod through floor in each structure with top protruding 6<br />

inches above floor.<br />

1. Seal floor opening against water penetration with waterproof nonshrink grout.<br />

Ground exposed metal components <strong>and</strong> hardware with bare-copper ground<br />

UNDERGROUND DUCTS AND RACEWAYS FOR ELECTRICAL SYSTEMS<br />

26 05 44 - 11 Electrical Systems

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