Michigan Department of Transportation 6'-0", 8'-0", 10'-0" NOMINAL SPREAD (SEE CONTRACT) LUMINAIRE ARM (SEE CONTRACT) POLE CAP 1'-6" (6'-0" ARM) 1'-10" (8'-0" ARM) 2'-0" (10'-0" ARM) NOMINAL RISE 2.38" O.D. 6" DETAIL A HAND HOLE ( 5) POLE CAP MAST ARM CAP 17'-0" (MIN) VERTICAL CLEARANCE (TYPICAL ALL SIGNALS) MAST ARM LENGTH DETAIL B OUTBOARD ARM INBOARD ARM GRADE 3 RISE ARM ID TAG HAND HOLE ( 5) POLE ID TAG DETAIL C 1'-6" NOMINAL MOUNTING HEIGHT POLE HEIGHT 23'-0" POLE HEIGHT W/ LUMINAIRE ARM 30'-0" NOMINAL MOUNTING HEIGHT TO BASE DETAIL D BASE > BASE ID TAG File: RefDoc/TR/Signals/Web/Sp Det/Fin/SIG030B.dgn Rev. 11/05/18 FOR PREPARED BY TRAFFIC AND SAFETY ENGINEER OF DELIVERY ENGINEER OF DEVELOPMENT TRAFFIC SIGNAL MAST ARM POLE AND MAST ARM DETAILS - CATEGORY I DRAWN BY: CHECKED BY: (SPECIAL DETAIL) 1 of6
ROUND TAPERED STEEL MAST ARM ROUND TAPERED STEEL MAST ARM POLE MAST ARM LENGTH MTG HT MTG HT * MAST ARM DIMENSIONS * POLE DIMENSIONS SINGLE TWIN LUMINAIRE ARM 20'-0" 0.1793"-16.50" x 13.70" x 20'-0" 0.4375"-18.00" x 14.78" x 23'-0" NO 25'-0" 0.1793"-16.50" x 13.00" x 25'-0" 0.4375"-18.00" x 13.9 x 29'-0" YES 30'-0" 0.1793"-16.50" x 12.30" x 30'-0" POLE TUBE TAPER IS 0.140 IN/FT 35'-0" 40'-0" 0.4290"-16.50" x 13.70" x 20'-0" 0.1793"- ** x 12.00" x ** 0.4290"-16.50" x 13.70" x 20'-0" 0.1793"- ** x 11.30" x ** 19'-0" 18'-6" & 21'-0" * DIAMETERS GIVEN ARE O.D. 45'-0" 0.4290"-16.50" x 13.70" x 20'-0" 0.1793"- ** x 10.60" x ** 50'-0" 0.5000"-16.75" x 13.95" x 20'-0" 0.1793"- ** x 10.15" x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of6
3/ SCH. 40 PIPE X 2 " LONG (FOR LIFTING) A 1/ POLE CAP 1/2"! ROUND STOCK C-HOOK (FOR WIRE SUPPORT & LIFTING) A 7/8" 2 " 6" 1 "! HOLE IN FRONT CLAMP FOR WIRING LUMINAIRE ARM 1'-7" 1/ THICK CLAMP \ LUMINAIRE ARM 1/2"! H.S. BOLT, FLAT WASHER, LOCK WASHER, & HEX NUT & H.S. BOLT FIELD DRILL 1 "! HOLE IN POLE. FURNISH I.D. GROMMET. DETAIL A ORIENTATION OF SCH. 40 PIPE 180 FROM HAND HOLE AT BASE & C-HOOK 180 FROM SCH. 40 PIPE SECTION A-A TELESCOPIC FIELD SPLICE \ MAST ARM 2'-6" (MIN) INBOARD ARM OUTBOARD ARM DETAIL B (35'-0" ARMS AND GREATER) 5/8"! BOLT WITH "ANCO" LOCK NUTS, 3/! HOLE FACTORY DRILLED IN OUTBOARD TUBE, FIELD DRILL INBOARD TUBE. (ORIENTATION MUST BE HORIZONTAL) 3/ SCH. 40 PIPE X 2 " LONG (FOR LIFTING) \ INBOARD ARM AND OUTBOARD ARM 1/ INBOARD/OUTBOARD ARM LIFTING DEVICE 3 of6
(4) 3/8" SIDE GUSSET >'S 3/8" X 2'-6" STEEL CLAMP HALF SHELLS "! HOLE THRU \ MAST ARM 2'- 6" 2 " 12" 12" 2 " 5/8" B B 6" 6" 6" 5 " PIPE & BOLT FOR 1/8" X 1 " COTTER PIN 3 RISE \ MAST ARM STEEL CLAMP HALF SHELL 5/16 C 5/8" SEE MAST ARM WELD DETAIL 1ƒ" > 5/16 5 " 4 LOCATIONS BACKING BAR MAST ARM > C 8 LOCATIONS 5/16 2 DETAIL C MAST ARM WELD DETAIL SIDE GUSSET >'S AND SADDLE >'S NOT SHOWN FOR CLARITY! HOLE IN FRONT CLAMP HALF SHELL FOR WIRING 4 LOCATIONS 2'- 2 " 1'- 8" 2 " 1/4 1ƒ" (4) 3/8" GUSSET SADDLE >'S (TOP AND BOTTOM) FIELD DRILL! HOLE IN POLE FOR WIRING (4) 3/ SCH. 80 PIPE X 3/ LONG WELDED TO BACK > FIELD DRILL (4) 11/16"! HOLES FOR 5/8"! X 3 " LONG HEX. HEAD BOLTS 4 1/4 LOCATIONS (4) 1 "! STUDS EACH WITH (2) HEX NUTS, (2) FLAT WASHERS, AND (2) LOCK WASHERS STEEL CLAMP HALF SHELL MAST ARM > \ MAST ARM 4 "! HOLE (MAST ARM >)! HOLE (MAST ARM >)! HOLE (STEEL CLAMP HALF SHELL >) SECTION B-B SECTION C-C SIDE GUSSET >'S AND SADDLE >'S NOT SHOWN FOR CLARITY 4 of6
FLAT WASHER NUT LOCK WASHER STUD MAST ARM CLAMP WASHER PLACEMENT GROUNDING PROVISION 3/8"! S.S. HEX BOLT TO MOUNT MECHANICAL LUG TO ACCOMODATE MIN. 1 #4 WIRE. 1/ X S.S. BACK UP BAR TO SECURE HAND HOLE COVER. (HORIZONTAL ORIENTATION) X X 1/2" SQUARE STOCK (DRILL & TAP) 1/2" 1/2" (MAX) 1/4 11 GA. COVER WITH 1/- 20 S.S. MACH. SCREW & S.S. CHAIN 1/2"! -13 N.C. DRILLED AND TAPPED HOLE WITH 1/2" STAINLESS STEEL BOLT WITH MAXIMUM PROJECTION OF 1/. & HAND HOLE 10" 6" 2 LOCATIONS 3/ X 3 " > BACK UP BAR (2) 1/2"! STAINLESS STEEL BOLT WITH COPPER DOWN CONDUCTOR ATTACHED VIA THREADED TINNED BRONZE CLAMP FOR LIGHTNING PROTECTION 6" X 10" BAR BOTTOM HAND HOLE 6" X 10" BAR BOTTOM HAND HOLE (VIEW ROTATED 90 DEGREES) 3/ X 3 " > 1/2" (MAX) 1/4 60 \ HAND HOLE, POLE & BASE ID TAGS 1/ X S.S. BACK UP BAR TO SECURE HAND HOLE COVER. (HORIZONTAL ORIENTATION) 11 GA. COVER WITH 1/-20 S.S. MACH. SCREW & S.S. CHAIN 1/2"! ROUND J-HOOK ANCHOR BOLT X 6 " BAR TOP HAND HOLE ORIENTATION OF HAND HOLE DESIGN WITH 29'-0" POLE ONLY 5 of6
MDOT NO. POLE TYPE & HAND HOLE (6) 2ˆ"! HOLES FOR 1'- 3 " D D (6) 1ƒ"! ANCHOR BOLTS EQUALLY SPACED AT 60 ON A 2! BOLT CIRCLE 1'- 0" I.D. OF POLE -! HOLE 6" X 10" HAND HOLE POLE 2'- 6 " 1'- 6" * CAULK 3/8 2" BASE ID TAG BACKING BAR DETAIL D (VIEW ROTATED 90 DEGREES) * SEAL JOINT WITH CAULK AFTER GALVANIZING SECTION D-D \ 1/2"! H.S. BOLT STEEL CAP SCH. 40 PIPE 3/ SQUARE STOCK E E 3/ SQUARE STOCK & MAST ARM 9/16"! HOLE FOR 1/2"! H.S. BOLT. TACK WELD 1/2" HEX NUT OR TAP HOLE IN 3/ SQUARE STOCK & MAST ARM C-HOOK POLE AND MAST ARM CAP DETAIL SECTION E-E 6 of6