Column truss connection Chord splice (see details (See details sheets 3 & 4 of 10) s Top truss chord Free end panel 10-0" Support end panels length varies (See chart below) \ Truss Back truss chord Top of finished grade Bottom truss chord Base plate (see details sheet 5 & 6 of 10) ISOMETRIC VIEW Drilled shaft Cantilever arm side Cut pipe to provide for column deflection as per table below 12" slope (in/12") BASE PLATE SLOPE FOR CAMBER Cantilever Truss Data Cantilever Arm Length Number of Panels Support End Panel Length Slope 40 4 35 4 30 3 25 3 20 2 2 @ 10-0" 2 @ 7-6" 2 @ 10-0" 2 @ 7-6" 2 @ 10-0" 1/8" 1/8" 1/8" 1/16" 1/16" NOTE: Cantilever "Type J" can be used only with written authorization from the MDOT - Traffic and Safety Support Area. DEPARTMENT DIRECTOR Kirk T. Steudle FOR Michigan Department of Transportation PREPARED BY DESIGN DIVISION APPROVED BY: DIRECTOR, BUREAU OF FIELD SERVICES STEEL CANTILEVER TRUSS TYPE J (20 FT - 40 FT) DRAWN BY: CHECKED BY: DHD AJU APPROVED BY: DIRECTOR, BUREAU OF HIGHWAY DEVELOPMENT 1 OF 10
NOTES: 1. The design of this structure is based on the AASHTO Standard Specifications for Structural Supports for Highway Signs, Luminaries and Traffic Signals, current Edition. 2. Only Type I Signs are to be used with the Type J Cantilever. 3. Maximum sign area is 450 square feet. Signs should not project past the ends of the truss. 4. All structural steel, bolts, welding and galvanizing shall be per "MDOT Standard Specifications for Construction". 5. Hot-dip galvanize all truss components prior to bolted assembly. 6. Tighten all high strength galvanized bolts by the turn of the nut method accordingto subsection 707.03.D. except at splice connections. Splice connections shall have a flat washer and lock washer under each nut and tightened to a snug tight condition. 7. Do not lift the trusses by the web members. 8. Maximum projection of the sign beyond the top chord is 6 feet. 9. Field splices may be placed along the structure to facilitate fabrication. Place field splice \ 1-6" min. to the gusset plate edge. Any deviation from the details shown on this typical will require approved shop drawings before fabrication. 10. Perform ultrasonic inspection of butt welded splices in column members. 11. Blast clean base plates, flange plates, stiffeners, and all weldments prior to galvanizing. 12. See current MDOT Sign Support Typical Plan SIGN-350-Series for sign foundation. 13. See current MDOT Sign Support Typical Plan SIGN-700-Series for sign connection. 14. Column sections shall be ASTM A53, Grade B or API-5l-x42 24"! x 1.219". 15. Chord sections shall be ASTM A500, Grade B HSS 6"! x 0.500", ASTM A519-4140 annealed HSS 6"! HSSx 0.375" or ASTM A500, Grade B HSS 6 5/8"x 0.432". 16. Web s shall be ASTM A36 l 5"x 5"x 7/16 " or l 5"x 5"x 1/2". 17. All steel plates shall be ASTM A709, Grade 36. 18. Use 7/8"! ASTM A325 bolts for all connections. Provide! holes unless otherwise stated. Use an ASTM F436 flat washer and a lock washer according to section 908.09.C of the MDOT Standard Specifications for Construction under each nut for splice connections. 19. The estimated weight of the truss is 190 lbs/ft. 20. Minimum sign height with aluminium beam is 8.5 feet. 21. Warpage in the base plate shall not exceed 1/16" per foot. 2 OF 10 NOTE: THE ORIGINAL SIGNED COPY IS KEPT ON FILE AT THE.
Column cap (See details A 1/4" Cap 3/4" Plate Top truss chord See Detail A Level 45 3/4" Plate 3-3 3/4" l5 x 5 x 7/16 \ Top chord s Back truss chord \ Back chord B 8-0" \ Truss chord Back truss chord 4-1 5/8" Clear B between plates 8-1 5/8" Clear between plates 6"! HSS Bott truss chord 5/8" Plate 1/4 1/4 \ Bottom chord Typ 45 1/4 1/4 Typ 24 - (Max.) \ Gusset plates 6" A 5/8" Plate 7 1/2" 12" 3-5 1/2" 3-5 5/8" Optional splice 6" VIEW A-A Wrap weld around outside edge, stop 1/4" short of corner clip 30 Base plate " COLUMN TRUSS CONNECTION DETAIL (WEB MEMBERS AND CONNECTION PLATES OMITTED FOR CLARITY) DETAIL OF OPTIONAL 1/4"x 2" Plate or std. chill ring BUTT-WELDED SPLICE 3 OF 10 NOTE: THE ORIGINAL SIGNED COPY IS KEPT ON FILE AT THE.
1-1 - 12" 12" 3-4" 24"! Pipe SECTION B-B 2-1 - 1 - \ 3/4" Plate 6" 6" 1-1 - 2-3 - 4" 1 3/4" 1 3/4" 1 3/4" 1 3/4" 4 3/4" 4 3/4" 4 3/4" 4 3/4" 3-5 1/2" 3-5 5/8" 6-11 1/8" (WEB MEMBERS AND CONNECTION 5/8" Plate PLATES OMITTED FOR CLARITY) 3/4" Truss chord 3/4" \ 3/4" Plate and \ truss chord 15/16" & bottom of > 3-4" 1 3/4" 1 3/4" 4" 4" 4" 4" 4" 4" 1-2 1/2" & gusset > DETAIL A \ 3/4" Plate 2-0"! 1-1 - 2-4 3/4" 4 3/4" 1 3/4" 9 1/2" 15/16"! Hole 1-4 - 0" (To top or bottom chord) 4-0 1/8" (To back chord) CHORD-COLUMN CONNECTION PLATE DETAILS 4 OF 10 NOTE: THE ORIGINAL SIGNED COPY IS KEPT ON FILE AT THE.
5/16 Column 30 Continuous 1/4 5/8 5/8 Back up ring 1/4"x min. Base plate Stiffener plate DETAIL B Wrap weld around outside edge stop weld 1/4" around corner clip See Detail C 1 - Stiffener plate See Detail B See sheet 2, note 20 for base plate warpage Leveling tolerance. nut 6" Typical anchor bolt Drilled shaft SECTION C-C Drilled shaft \ 36"! Bolt circle Column wall 1/4" Weld and grind smooth C C DETAIL C 11.25 2 3/16"! Holes for 2"! bolts 6"! Hole Column O.D. 24" Base plate 42"! x PLAN VIEW 42" BASE PLATE (FOR USE WITH 35 FT AND 40 FT CANTILEVER ARMS) 5 OF 10 NOTE: THE ORIGINAL SIGNED COPY IS KEPT ON FILE AT THE.
1/4" See Detail C (sheet 5) 1-4 1/2" Stiffener plate See Detail B (sheet 5) SEE 2, NOTE 20 FOR BASE PLATE WARPAGE Leveling nut 4" 7" TOLERANCE. \ Anchor bolt Drilled shaft SECTION D-D Drilled shaft \ 32"! Bolt circle D D 15 Stiffener plate 6"! Hole 2 3/16"! Holes for 2"! bolts Column O.D. 24" Base plate 38"! x PLAN VIEW 38" BASE PLATE (FOR USE WITH 20 FT THROUGH 30 FT CANTILEVER ARMS. ALSO FOR USE WITH 35 FT AND 40 FT CANTILEVER ARMS WITH REDUCED SIGN AREA, SEE CHART SIGN-350 SERIES, 5) 6 OF 10 NOTE: THE ORIGINAL SIGNED COPY IS KEPT ON FILE AT THE.
\ Top chord Top truss chord \ Connection 30 plates \ Connection 8-0" 4-0" 4-0" \ Truss plates E E F Back truss chord \ Connection plates \ Bottom chord 30 F Bottom truss chord 6-11 1/8" TYPICAL SECTION OF TRUSS See Detail D \ Back truss chord 8-0" 8-0" s (typ) See Detail E \ Top truss chord \ Top truss chord See Detail H See Detail F VIEW E-E VIEW F-F SIMILAR See Detail J See Detail G See Detail K s (typ) \ Bottom truss chord See Detail I FRONT OF TRUSS ELEVATION (BACK TRUSS CHORD AND ATTACHED ANGLES NOT SHOWN FOR CLARITY) 7 OF 10 NOTE: THE ORIGINAL SIGNED COPY IS KEPT ON FILE AT THE.
End plug (See detail 2 1/4" DETAIL D DETAIL E Column connection > plate shown skewed to plane of view (See details sheet 4 of 10) DETAIL F DETAIL G (Min) End plug (See detail 90 DETAIL H DETAIL J Column connection > (See details sheet 4 of 10) DETAIL K DETAIL L Dimension typical for all connection details. See sheet 9 of 10 for alternate connection details. 8 OF 10
1 " 14 1/2" End plug (See detail of 5 1/2" of 1 " ALTERNATE DETAIL D ALTERNATE DETAIL E 5 1/2" 14 1/2" of of Column connection > plate shown skewed to plane of view (See details sheet 4 of 10) ALTERNATE DETAIL F ALTERNATE DETAIL G End plug (See detail 90 6" of of ALTERNATE DETAIL H ALTERNATE DETAIL J Column connection > (See details sheet 4 of 10) of of ALTERNATE DETAIL K ALTERNATE DETAIL L Dimension typical for all connection details. 9 OF 10 NOTE: THE ORIGINAL SIGNED COPY IS KEPT ON FILE AT THE.
7 Spa @ = 1-9" 3 1/2" 2 1/2" G G 7/8"! Boltw/lock washer 1/8" Max gap between pipes 3 Spa @ = 9" 3 Spa @ = 9" \ Splice ELEVATION l6 x 6 x 1/2 7/8"! Bolt w/lock washer SECTION G-G CHORD SPLICE CONNECTION DETAILS 3/16" l1 1/2 x 1 1/2 x 1/4 9/16"! Hole 1/4" Plate tack weld 1/2" hex nut or tap hole in SECTION H-H for 1/2"! bolt 1/4" Cap plate 1/2" Hex head bolt 1/4" 1/2" PLUG DETAIL (USE AT EACH END OF CHORD) H H COLUMN CAP DETAIL 10 OF 10 NOTE: THE ORIGINAL SIGNED COPY IS KEPT ON FILE AT THE.