Metal FabricationsME- Building Group
SECTION 055000 - METAL FABRICATIONS
PART 1GENERAL
1.1RELATED DOCUMENTS
A.Drawings and general provisions of Contract, including General and Supplementary Conditions and Division1 Specification Sections, apply to this Section.
1.2SUMMARY
A.This Section includes the following:
1.Metal ladders.
2.Ladder safety cages.
3.Steel framing and supports for mechanical and electrical equipment.
4.Steel framing and supports for applications where framing and supports are not specified in other Sections.
5.Elevator machine beams andhoist beams.
6.Support angles for elevator door sills.
7.Metal angle corner guards.
8.Metal edgings.
9.Metal bollards.
10.Miscellaneous metal trim.
11.Steel framing and supports for ceiling-hung toilet compartments.
12.Highway guardrails.
B.Related Sections include the following:
1. Division1 Section "Quality Requirements" for independent testing agency procedures and administrative requirements.
2.Division 3 Section “Grout” for Nonmetallic, Shrinkage-Resistant Grout.
3.Division5 Section "Structural Steel Framing" for structural steel framing system components.
4.Division5 Section "Metal Stairs And Rails" for metal-framed stairs with metal pan, metal plate, or grating treads.
5.Division 9 Section "Structural Metal Primer/Finish" for shop painting requirements.
6.Division13 Section "Metal Building Systems" for structural-steel framing system components.
1.3SUBMITTALS
A.LEED Submittals:
1.Product Data for CreditMR4: For products having recycled content, manufacturer documentation indicating percentages by weight of postconsumer and preconsumer recycled content.
a.Include statement indicating costs for each product having recycled content.
2.Product Data for Credit MR 5: For products and materials to comply with requirements for regional materials, provide documentation indicating location of product or material manufacturing location and the point of extraction, harvest, or recovery for each raw material.
a.Include documentation on distance to project, contractor cost for each regional material, and percent by weight that is considered regional.
B.Shop Drawings: Detail fabrication and erection of each metal fabrication indicated.
1.Include plans, elevations, sections, and details of metal fabrications and their connections. Show anchorage and accessory items.
2.Provide templates for anchors and bolts specified for installation under other Sections.
1.4QUALITY ASSURANCE
A.Fabricator Qualifications: Engage a firm experienced in producing metal fabrications similar to those indicated for this Project and with a record of successful in-service performance, as well as sufficient production capacity to produce required units.
B.Welding: Qualify procedures and personnel according to the following:
1.AWSD1.1 "Structural Welding Code--Steel."
2.AWSD1.3 "Structural Welding Code--Sheet Steel."
3.Certify that each welder has satisfactorily passed AWS qualification tests for welding processes involved and, if pertinent, has undergone recertification.
C.Comply with applicable provisions of the following specifications and documents:
1.AISC "Specification for Structural Steel Buildings--Allowable Stress Design and Plastic Design."
2.AISC Code of Standard Practice for Steel Buildings and Bridges
3.AISC "Specification for Allowable Stress Design of Single-Angle Members."
4.ASTMA6"Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling."
5.Research Council on Structural Connections (RCSC) "Specification for Structural Joints Using ASTMA325 or A490 Bolts."
1.5DELIVERY, STORAGE, AND HANDLING
A.Deliver coated materials to Project site clean and covered to protect against road splatter, and in quantities timed to ensure continuity of installation.
B.Ship, unload, and store materials to permit easy access for inspection and identification. Keep steel members off ground and spaced by using pallets, platforms, or other supports and spacers. Protect steel members and packaged materials from corrosion and deterioration.
1.Do not store materials on structure in a manner that might cause distortion or damage to members or supporting structures. Repair or replace damaged materials or structures as directed.
2.Steel that becomes soiled or otherwise defaced, shall be washed clean just before erection.
C.Handle to not damage shop applied coating.
D.Store fasteners in a protected place in sealed containers with manufacturer’s labels intact.
1.Clean and relubricate bolts and nuts that become dry or rusty before use.
2.Comply with manufacturer’s written recommendations for cleaning and lubricating ASTM F 1852 fasteners and for retesting fasteners after lubrication.
1.6PROJECT CONDITIONS
A.Field Measurements: Where metal fabrications are indicated to fit walls and other construction, verify dimensions by field measurements before fabrication and indicate measurements on Shop Drawings. Coordinate fabrication schedule with construction progress to avoid delaying the Work.
1.Established Dimensions: Where field measurements cannot be made without delaying the Work, establish dimensions and proceed with fabricating metal fabrications without field measurements. Coordinate construction to ensure that actual dimensions correspond to established dimensions. Allow for trimming and fitting.
1.7COORDINATION
A.Coordinate installation of anchorages for metal fabrications. Furnish setting drawings, templates, and directions for installing anchorages, including sleeves, concrete inserts, anchor bolts, and items with integral anchors, that are to be embedded in concrete or masonry. Deliver such items to Project site in time for installation.
PART 2PRODUCTS
2.1METALS, GENERAL
A.Metal Surfaces, General: For metal fabrications exposed to view in the completed Work, provide materials with smooth, flat surfaces without blemishes. Do not use materials with exposed pitting, seam marks, roller marks, rolled trade names, or roughness.
2.2FERROUS METALS
A.Recycled Content of Steel Products: Provide products with an average recycled content of steel products so postconsumer recycled content plus one-half of preconsumer recycled content is not less than the following:
1.W-Shapes: 60 percent.
2.Channels, Angles,M,S-Shapes: 60 percent.
3.Plate and Bar: 25 percent.
4.Cold-Formed Hollow Structural Sections: 25 percent.
5.Steel Pipe: 25 percent.
6.All Other Steel Materials: 25 percent.
B.Regional Content of Materials (list that products need to be harvested and manufactured within 500 miles of project site)
C.Steel Plates, Shapes, and Bars: ASTMA36/A36M unless noted otherwise on drawings.
D.Stainless Steel Sheet, Strip, Plate, and Flat Bars: ASTMA240 or ASTMA666, Type304.
E.Rolled-Steel Floor Plate: ASTMA786/A786M, rolled from plate complying with ASTMA36/A36M or ASTMA283/A283M, Grade C or D.
F.Steel Tubing: Cold-formed steel tubing complying with ASTMA500.
G.Steel Pipe: ASTMA53, Schedule80, unless another weight is indicated or required by structural loads.
H.Slotted Channel Framing: Cold-formed metal channels with flange edges returned toward web and with continuous slot complying with MFMA-4.
1.Size of Channels: 1-5/8 by 1-5/8 inches, unless otherwise indicated or required.
2.Metal and Thickness: Galvanized steel complying with ASTMA653/A653M, commercial steel, Type B, with G90 coating; 0.079 inch nominal thickness, unless otherwise indicated.
3.Finishes:
a.Interior Applications: Electroplated zinc having a coating of 0.2 to 0.5 mil.
b.Exterior Applications: Pregalvanized zinc having a coating of 0.75 mil.
I.Gray-Iron Castings: ASTMA48, Class30, unless another class is indicated or required by structural loads.
J.Cast-in-Place Anchors in Concrete: Anchors of type indicated below, fabricated from corrosion-resistant materials capable of sustaining, without failure, the load imposed within a safety factor of 4, as determined by testing per ASTME488, conducted by a qualified independent testing agency.
1.Threaded or wedge type; galvanized ferrous castings, either ASTMA47 malleable iron or ASTMA27/A27M cast steel. Provide bolts, washers, and shims as needed, hot-dip galvanized per ASTMA153/A153M.
K.Welding Rods and Bare Electrodes: Select according to AWS specifications for metal alloy welded.
2.3NONFERROUS METALS
A.Nickel Silver Extrusions: ASTMB151/B151M, Alloy UNSNo.C74500.
B.Nickel Silver Castings: ASTMB584, Alloy UNS No.C97600 (20 percent leaded nickel bronze).
2.4PAINT
A.Primer/finish coating is specified in Division 9 Section "Structural Metal Primer/Finish."
B.Galvanizing Repair Paint: High-zinc-dust-content paint for regalvanizing welds in steel, complying with SSPC-Paint20.
C.Bituminous Paint: Cold-applied asphalt mastic complying with SSPC-Paint12, except containing no asbestos fibers or cold-applied asphalt emulsion complying with ASTMD1187.
2.5FASTENERS
A.General: Provide Type 304 or 316 stainless-steel fasteners for exterior use and zinc-plated fasteners with coating complying with ASTMB633, ClassFe/Zn5, where built into exterior walls. Select fasteners for type, grade, and class required.
B.Bolts and Nuts: Regular hexagon-head bolts, ASTMA325.
C.Anchor Bolts: ASTMF1554, Grade36; with nuts, ASTM A 563; and, where indicated, flat washers.
1.Hot-dip galvanize or provide mechanically deposited, zinc coating where item being fastened is indicated to be galvanized.
D.Machine Screws: ASMEB18.6.3.
E.Lag Bolts: ASMEB18.2.1.
F.Plain Washers: Round, carbon steel, ASMEB18.22.1.
G.Lock Washers: Helical, spring type, carbon steel, ASMEB18.21.1.
H.Expansion Anchors: Anchor bolt and sleeve assembly of material indicated below with capability to sustain, without failure, a load equal to six times the load imposed when installed in unit masonry and equal to four times the load imposed when installed in concrete, as determined by testing per ASTME488, conducted by a qualified independent testing agency.
1.Material: Carbon steel components zinc plated to comply with ASTMB633, ClassFe/Zn5.
2.6FABRICATION, GENERAL
A.Shop Assembly: Preassemble items in shop to greatest extent possible to minimize field splicing and assembly. Disassemble units only as necessary for shipping and handling limitations. Use connections that maintain structural value of joined pieces. Clearly mark units for reassembly and coordinated installation.
B.Shear and punch metals cleanly and accurately. Remove burrs and ease edges to a radius of approximately 1/32 inch unless otherwise indicated. Remove sharp or rough areas on exposed surfaces.
C.Form bent-metal corners to smallest radius possible without causing grain separation or otherwise impairing work.
D.Weld corners and seams continuously to comply with the following:
1.Use materials and methods that minimize distortion and develop strength and corrosion resistance of base metals.
2.Obtain fusion without undercut or overlap.
3.Remove welding flux immediately.
4.At exposed connections, finish exposed welds and surfaces smooth and blended so no roughness shows after finishing and contour of welded surface matches that of adjacent surface.
E.Form exposed connections with hairline joints, flush and smooth, using concealed fasteners where possible. Use exposed fasteners of type indicated or, if not indicated, Phillips flat-head (countersunk) screws or bolts. Locate joints where least conspicuous.
F.Fabricate joints that will be exposed to weather in a manner to exclude water, or provide weep holes where water may accumulate.
G.Cut, reinforce, drill, and tap metal fabrications as indicated to receive finish hardware, screws, and similar items.
H.Provide for anchorage of type indicated; coordinate with supporting structure. Fabricate and space anchoring devices to secure metal fabrications rigidly in place and to support indicated loads.
I.Allow for thermal movement resulting from the following maximum change (range) in ambient and surface temperatures by preventing buckling, opening up of joints, overstressing of components, failure of connections, and other detrimental effects. Base engineering calculation on surface temperatures of materials due to both solar heat gain and nighttime-sky heat loss.
1.Temperature Change (Range): 120 deg F ambient; 180 deg F material surfaces.
J.Form exposed work true to line and level with accurate angles and surfaces and straight sharp edges.
K.Remove sharp or rough areas on exposed traffic surfaces.
2.7METAL LADDERS
A.General: Fabricate ladders for locations shown, with dimensions, spacings, details, and anchorages as indicated.
1.Comply with ANSIA14.3, unless otherwise indicated.
2.For elevator pit ladders, comply with ASME A17.1
B.Steel Ladders:
1.Space siderails 16 inches apart unless otherwise indicated.
2.Space siderails of elevator pit ladders 12 inches apart.
3.Rungs: 3/4-inch diameter steel bars.
4.Fit rungs in centerline of side rails; plug-weld and grind smooth on outer rail faces.
5.Provide hot rolled, pickled and oiled carbon steel, traction tread ladder rung covers.
6.Support each ladder at top and bottom and not more than 8 feet o.c. maximum with welded or bolted steel brackets. Size brackets to support design loads specified in ANSIA14.3.
7.The ladder opening at the top of a platform must have a self-closing safety gate installed. Chains are not acceptable.
8.Galvanize ladders, including brackets and fasteners, in the following locations:
a.Exterior.
2.8LADDER SAFETY CAGES
A.General: Fabricate the safety cage and basket design/construction requirements must comply with Chrysler Group LLC SMI-129 and OSHA 29 CFR 1910.27. Assemble by welding or riveting.
B.Fasten assembled safety cage to ladder rails and adjacent construction by welding or riveting, unless otherwise indicated.
C.Galvanize ladder safety cages, including fasteners, in the following locations:
1.Exterior.
D.Steel Ladder Safety Cages:
1.Primary Hoops: 1/4-by-4-inch flat bar hoops.
2.Secondary Intermediate Hoops: 1/4-by-2-inch flat bar hoops.
3.Vertical Bars: 3/16-by-1-1/2-inch flat bars secured to each hoop.
2.9MISCELLANEOUS FRAMING AND SUPPORTS
A.General: Provide steel framing and supports that are not a part of structural-steel framework as necessary to complete the Work.
B.Fabricate units from structural-steel shapes, plates, and bars of welded construction, unless otherwise indicated. Fabricate to sizes, shapes, and profiles indicated and as necessary to receive adjacent construction retained by framing and supports. Cut, drill, and tap units to receive hardware, hangers, and similar items.
1.Fabricate units from slotted channel framing where indicated.
2.Where units are indicated to be cast into concrete or built into masonry, equip with integrally welded steel strap anchors 1-1/4 inches wide by 1/4 inch thick by 8 inches long at 24 inches o.c., unless otherwise indicated.
3.Furnish inserts if units must be installed after concrete is placed.
C.Galvanize miscellaneous framing and supports where indicated.
2.10MISCELLANEOUS STEEL TRIM
A.Unless otherwise indicated, fabricate units from structural-steel shapes, plates, and bars of profiles shown with continuously welded joints, and smooth exposed edges. Miter corners and use concealed field splices where possible.
B.Provide cutouts, fittings, and anchorages as needed to coordinate assembly and installation with other work. Provide anchors, welded to trim, for embedding in concrete or masonry construction, spaced not more than 6 inches from each end, 6 inches from corners, and 24 inches o.c., unless otherwise indicated.
C.Galvanize miscellaneous steel trim in the following locations:
1.Exterior.
2.11METAL BOLLARDS
A.Pipe bollards with base plates to be expansion bolted to floor slabs will be fabricated from Schedule80 steel pipe.
1.Cap bollards with 1/4-inch-minimum steel plate.
B.Pipe bollards to be installed with a foundation will be concrete filled and fabricated from Schedule 40 steel pipe.
C.Finish:
1.Exterior (as indicated on Drawings): Hot-dip galvanized after fabrication.
2.Interior at Vehicle Doors, And At All Fire Hydrants: Painted after installation.
2.12HIGHWAY GUARDRAIL
A.Guiderail shall be galvanized steel “W” type with galvanized steel I-beam posts and spacers conforming to AASHTO M180. Guiderail shall be fabricated of hot rolled structural steel shapes, W6x8.5, in accordance with ASTM A36 or ASTM A588. Apply zinc coating to steel of 2.0 ounces/sq.ft. thickness of double exposed surface in accordance with ASTM A525 or ASTM A123. Bolts shall be galvanized in accordance with ASTM A153.
B.Provide curved end shoes and all bolts, nuts and other accessories.
2.13FINISHES, GENERAL
A.Finish metal fabrications after assembly.
B.Galvanizing: Hot-dip galvanize items as indicated to comply with applicable standard listed below:
1.ASTMA123, for galvanizing both fabricated and unfabricated iron and steel products made of uncoated rolled, pressed, and forged shapes, plates, bars, and strips 0.0299 inch thick and heavier.
2.ASTMA153/A153M, for galvanizing steel and iron hardware.
3.Fill vent and drain holes that will be exposed in finished Work, unless indicated to remain as weep holes, by plugging with zinc solder and filing off smooth.
C.Shop Painting: Refer to Division 9 Section "Structural Metal Primer/Finish".
2.14STAINLESS-STEEL FINISHES
A.Remove tool and die marks and stretch lines or blend into finish.
B.Grind and polish surfaces to produce uniform, directionally textured, polished finish indicated, free of cross scratches. Run grain with long dimension of each piece.
1.Bright, Directional Satin Finish: No.4.
2.When polishing is completed, passivate and rinse surfaces. Remove embedded foreign matter and leave surfaces chemically clean.
PART 3EXECUTION
3.1INSTALLATION, GENERAL
A.Cutting, Fitting, and Placement: Perform cutting, drilling, and fitting required for installing metal fabrications. Set metal fabrications accurately in location, alignment, and elevation; with edges and surfaces level, plumb, true, and free of rack; and measured from established lines and levels.
B.Set posts and bollards accurately in location, alignment, and elevation; with edges and surfaces level, plumb, true, and free of rack; and measured from established lines and levels.
C.Fit exposed connections accurately together to form hairline joints. Weld connections that are not to be left as exposed joints but cannot be shop welded because of shipping size limitations. Do not weld, cut, or abrade surfaces of exterior units that have been hot-dip galvanized after fabrication and are for bolted or screwed field connections.
D.Field Welding: Comply with the following requirements:
1.Use materials and methods that minimize distortion and develop strength and corrosion resistance of base metals.
2.Obtain fusion without undercut or overlap.
3.Remove welding flux immediately.
4.At exposed connections, finish exposed welds and surfaces smooth and blended so no roughness shows after finishing and contour of welded surface matches that of adjacent surface.
E.Fastening to In-Place Construction: Provide anchorage devices and fasteners where necessary for securing metal fabrications to in-place construction. Include threaded fasteners for concrete and masonry inserts, toggle bolts, through-bolts, lag bolts, wood screws, and other connectors.
F.Provide temporary bracing or anchors in formwork for items that are to be built into concrete, masonry, or similar construction.
G.Corrosion Protection: Coat concealed surfaces of aluminum that will come into contact with grout, concrete, masonry, wood, or dissimilar metals with a heavy coat of bituminous paint.