Anchoring Details

WeldsRecommended for all permanently installed grating panels. Welds should be 3/16” fillet welds, 3/4” long located approximately 6” from each side of panel (4 locations) and one weld in middle of panel at each intermediate support.

Weld LugsWeld lugs may be used for installations where grating is subject to removal. Weld lugs are shop fabricated and must be specified at time of grating order. Fasten-ers are 1/4” minimum and supplied by others. Location is the same as “Attach-ment Locations” diagram.

Attachment LocationsAttachments should be placed at intermediate supports in the middle of the panels and at the four bearing bar ends, 6” from each side of panel. Welds should be 3/16” fillet welds, 3/4” long. Heavy-Duty grating may require additional welding to meet application needs.

Other clips and fasteners available upon request.

Type H-1 Anchor ClipA flat head J-bolt secures a preformed plate to the underside of steel bearing bars and structural supporting flange. No drilling needed. Access to the underside of grating is required for installation. Available in carbon steel. J-bolt is 1/4” x 2-1/2” for grating up to 2-1/4” deep and 1/4” x 3-1/2” for 2-1/2” to 3-1/2” deep grating.

Type H-3 Saddle ClipThe saddle clip bridges two bearing bars and is attached with 1/4” self-tapping bolt, 1/4” self threader, 1/4” weld stud or 1/4” bolt and nut when hole is drilled through supporting flange. Available for 15/16”, 1-3/16” and 1-3/8” bear-ing bar spacings (15, 19 and 22 space) in carbon and stainless steel. Fasteners should

Installation Clearances

*Cross rods may extend 1/8” from bearing bars.

All rectangular cutouts are made to the next bearing bar beyond the penetration with a clearance not to exceed bearing bar spacing.

All panel width dimensions(including cutout) are givento the nearest bearing bar.

I-Beam and Angle Curb I-Beam and Kickplate I-Beam and Handrail I-Beam

*1/4” is recommended but dimension may vary due to bearing bar spacing. Dimension should not exceed bearing bar spacing.

PANEL TO PANEL CLEARANCES AND CUTOUT CLEARANCES

SUPPORT CLEARANCES

Channel Toed Out Channel Toed In Angle in Concrete Concrete

1/4” clearance*1/4” clearance*between ends of between ends of cross bars orcross bars orcross rods oncross rods onrectangularrectangulargrating or rivet grating or rivet heads on rivetedheads on rivetedgrating. (3/8”grating. (3/8”clearance forclearance forheavy-duty grating).heavy-duty grating).

............. Specifi ed............. Specifi ed_______ Actual_______ Actual

3/8”3/8”

Attachment to Length of Bearing BarToeplate to be welded with alternating 1/8” fillet welds, 1” long every 12”.

Attachment to End of Bearing BarLoad carrying toeplates to be welded at each bearing bar with a fillet weld the size of the bearing bar thickness (t), 3/4” long. Non-load carrying toeplates to be welded to bearing bars with 1/8” fillet weld (3/16” for heavy-duty), 3/4” long every 5”.

Maximum depth of toeplate is (a+d). It should not extend below the bearing bars. The minimum recommended dimension for “a”, the projection of toe plate above the grating, is 4”.

ToePlATeS

Standard Trim BandEnd band to be welded with 1/8” fillet welds (3/16” for heavy duty), 3/4” long every 5”.

Load Banding (must specify)Load carrying end band to be welded with fillet weld the size of bearing bar thickness (t) and the length of bearing bar depth (d) at each bearing bar. This spec is for standard grating. Refer to NAAMM MBG 532 for heavy duty specification.

BANDING

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Cross Rod Spacing and AlignmentCross rods should not vary more than 1/8 in 12 in either direction from perpendicular alignment with bearing bars. The tolerance of the cross bar spacing for 5’ in length is ±1/4”.

Bearing Bar LeanBearing bar lean must not exceed a slope of 1-1/4 to 12.

Cross Bar LeanCross bar lean must not exceed a slope of 2-1/2 to 12.

Cross Rod PositionThe top of the cross rod should not project more than 1/16” above the top of the bearing bars for standard grating (1/8” for heavy-duty) and should not extend more than 1/8” from side of bearing bars.

Longitudinal BowLongitudinal bow should be less than 1/200 of the length for standard grating (1/240 for heavy duty).

Tranverse BowBefore banding, the tranverse bow should be less than 1/8” per foot of width.

PANEL TOLERANCES

BEARING BAR AND CROSS ROD TOLERANCES

Overall Dimensions and SquarenessD = Overall diagonal dimensionW = Length of cross rods including extensions outside of bearing barsL = Length of bearing bars

safeTY-griP® BoLT seaTs

Safety-Grip® planks can be mechanically fastened to a structural support by using specially designed Bolt Seats which seat within the large debossed holes, below the walking surface. Bolt Seats have an oblong hole to accommodate a 3/8” bolt, and are available in:

• 11ga.,G90Galvanized(H12264)• .125”Aluminum(H12264A)• 316LStainless(H12264S)

DiaMonD-griP® BoLT seaTsDiamond-Grip® planks can be mechani-cally fastened to a structural support by using specially designed Bolt Seats which seat in between the raised diamonds below the walking surface. Bolt Seats have a round hole to accommodate a 3/8” bolt, and are available in:

• 12ga.,G90Galvanized(H12262)• .125”Aluminum(H12262A)• Stainless(H12262S)byspecial

request only.• Optionalsquareholeinboltseatto

accommodate 5/16” carriage bolt available by special request (H12262SQ)

MiD-sUPPorT CLiP asseMBLYBetween structural supports it may be necessary to tie planks together to minimize relative deflection. This is accomplished by using a Mid-Support Clip which draws the plank’s side channels together by applying pressure between the bolts and the clip edge (clip no. MSCL).

INSTAllATIoN ACCeSSoRIeS

iP asseMBLies In order to alleviate the necessity of drilling a hole through a structural mem-ber, a Bolt Seat and “J” Clip assembly can be used. The friction connection is accomplished by wedging the grating between the Bolt Seat and structural support, by applying pressure to the underside of the flange of the support-ing steel (clip no. H12296). not recommended in areas subject to vibration.

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oveR SuPPoRT—SPlICe PlATe kIT

notes:

•Thiskitisintendedtosplicetwosectionsofwalkwaytogether OVER A SUPPORT OnLY.

•Thewalkwaykitincludestwospliceplateswithslotted holes and 16 fastener sets.

•HolesinthegratingwalkwayarenotprovidedbyAMICO and are to be field drilled.

notes:

•Thiskitisintendedtosplicetwosectionsofanywidthofwalkway together between supports.

•Thewalkwaykitincludesonewraparoundplatewithfastening hardware for walking surface and side channel connection. The fastener points should be staggered evenly across the plank width on each side of the splice. The side channel (kick plate) connection utilizes four slots provided in the splice flange.

•HolesinthegratingwalkwayarenotprovidedbyAMICOandareto be field drilled.

BeTWeeN SuPPoRT—SPlICe PlATe kIT

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