HomeMy WebLinkAboutFile Documents.39551 Hwy 82.0199.2018 (2).ARBK08/17/2018
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TRUSCOTT EXTERIOR STAIR LANDING REPAIR NOTES
NOTE: REMOVE ALL RUST AND SPALLING OF STEEL AND GALVANIZED COATING TO BASE METAL
AND RECOAT WITH GALVANIZED OR ASPHALTIC MATERIAL PRIOR TO INSTALLING NEW CONCRETE
CONCRETE
CONCRETE HAS BEEN DESIGNED AND SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE
AMERICAN CONCRETE INSTITUTE BUILDING CODE (ACI 318 -LATEST EDITION) ALL CONCRETE
SHALL HAVE A MINIMUM COMPRESSIVE STRENGTH OF 3000 PSI IN 28 DAYS. PROVIDE MIN. AIR
ENTRAINMENT OF 6% ON STAIRS AND EXTERIOR DECKS. REINFORCE STAIR LANDINGS AND
CONCRETE DECKS WITH 6X6 W1.4 X W1.4 W.W.F. WELDED WIRE FABRIC SHALL CONFORM TO
ASTM A185. LAP WIRE FABRIC REINFORCEMENT ONE FULL MESH PLUS 2" AT SIDES AND ENDS AND
WIRE TOGETHER.
ALTERNATE CONCRETE REINFORCING FOR CONCRETE FILL IS 3000 PSI IN 28 DAY FIBER
REINFORCED CONCRETE RATHER THAN USING STD WOVEN WIRE FABRIC.
STEEL DECKING
FORM DECK SHALL BE 9/16" DEEP, 30" WIDE, 26 GAGE GALVANIZED STEEL, WITH MINIMUM YIELD
STRESS OF 33 KSI, WITH MINIMUM S = 0.042 IN.3 AND I = 0.013 INA PER FOOT OF WIDTH. DECK
SHALL BE ERECTED IN ACCORDANCE WITH MANUFACTURER'S RECOMMENDATIONS AS 3 SPAN
MINIMUM AND SHALL BE ATTACHED USING THE FOLLOWING MINIMUM ATTACHMENTS:
WELD DECK TO SUPPORTING MEMBERS WITH 4-1/2" DIAMETERS OR 3/8" X 3/4" PUDDLE WELDS
PER SHEET AT ENDS, END LAPS AND AT INTERMEDIATE SUPPORTS, AND AT 20" O.C. AT
PERIMETER BEAMS AND OPENING EDGES RUNNING PARALLEL TO THE DECK. SIDE SEAM
ATTACHMENT SHALL BE BUTTON PUNCHES AT 20" O.C. ALL WELDING SHALL BE PERFORMED BY
WELDERS EXPERIENCED IN LIGHT GAGE STEEL DECK WORK.
Or
Attach deck to steel angle support with self taping screw with galvanized washer at 8 inches on center.
Comply with the steel decking institute standards.
Deck fastening to the structural frame can be accomplished with welds, self drilling
screws, air driven, or powder driven fasten- ers. A minimum of 1 12" of end bearing
should be provided for deck. If there is less than 1 12" of bearing, additional
fastening should be provided and the deck end load capacity should be checked.
For deck that is intended to end lap (roof deck), the end lap location should be
adjusted so the center of the lapped portion occurs
over the support or, when supported by bar joists, over a top chord member.
Only qualifed operators may use powder actuated tools; air actuated tools must be
used by trained operators familiar with all safety procedures.
ERECTION OF DECK AND JOB SITE SAFETY
Attaching
Special electric screw guns are used to drive self -drilling
screws to attach deck to the structural frame. These screw guns are equipped with a
clutch and depth limiting nosepiece to prevent over torquing. Screws are typically
#12's or 1/4 inch diameter with a special drill point selected according to the total
thickness of metal (deck plus frame) being joined.