Hatch for raised access floors
DT-AHD
U.S.F. Fabrication Inc.
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.
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.
