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DT-AHD

Angle Frame, AASHTO H-20 Wheel Loading, Double Door

The heavy-duty angle type floor access door is designed for applications where watertightness is not required. It is intended to receive AASHTO H20-44 wheel loads in street with two lanes of travel (one in each direction) where the posted speed limit does not exceed 35 MPH. Areas where these doors cannot be used include: port facilities, military bases, airports, landfills, freight terminals, bus terminals or any other area where there is continuous commercial vehicle traffic.

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STANDARD SIZES (custom sizes available)

FRAME OPENING Width x Hinge Side
30 x 48” [762mm x 1219mm]	48 x 48” [1219mm x 1219mm]
30 x 54 [762mm x 1372mm]	48 x 54 [1219mm x 1372mm]
36 x 48” [914mm x 1219mm]	48 x 72[1219mm x 1829mm]
36 x 60 [914mm x 1524mm]	60 x 60[1524mm x 1524mm]
42 x 48” [1067mm x 1219mm]

OPTIONS

Skirts for concrete slabs deeper than 12 inches
Nut rails with stainless steel sliding nuts for attaching cable holders, brackets and other hardware
Custom lettering
Stainless steel safety chains with aluminum support posts
Fall Trough Prevention Systems
Hinge covers on same long side (allows springs to be horizontal)

STANDARD SPECIFICATIONS

The floor access door shall be Model DT-AHD as manufactured by U.S.F. Fabrication, Inc. with the size being specified on the plans.

Covers: 1/2-inch (12.7mm) steel diamond plate covers reinforced for a AASHTO H20-44 wheel load. Covers are bolted to frame when closed with 316 stainless steel allen-head bolts to allow for direct traffic loading--an allen-head socket with torque wrench will be provided with the door. The allen-head bolts must be tightened to 25 foot pounds of torque and securely fastened using Loctite 242 whenever the covers are closed to insure safe and proper performance of the door. The door shall be equipped with a steel flush lifting handle and 316 stainless steel hold-open arms with red vinyl grips that automatically keep the covers in their open/upright positions. (Upon request, manufacturer shall provide structural calculations showing that the door design meets the loading requirements of AASHTO H20-44.)
Lift Assist: Open, stainless steel, bolt-on, vertical compression springs for easy opening.

Frame: 1/2-inch (12.7mm) thick steel angle with anchors welded to the frame for casting into concrete. A steel skirt shall be welded to the frame to provide a combined height equal to the depth of the concrete slab.
Hardware: Tamper resistant hinges with recessed stainless steel pins and lugs.
Security: Both covers shall have a recessed staple for a padlock.
Finish: Hot dipped galvanized.
Installation: Installation shall be in accordance with the manufacturer’s instructions. The entire frame, including the seat on which the reinforcing rests, shall be supported by concrete or other material designed to support the specified loading.
Warranty: Manufacturer shall guarantee against defects in materials and workmanship for a period of five years.

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