METAL FABRICATIONS OF EDUCATIONAL CENTER
Metall structures shop drawings for educational center have been made.
METAL FABRICATIONS
DESCRIPTION
Fabrications shall be well-constructed products conforming to the types, materials and details indicated on drawings or specified herein. Basic forms of metal components from which assemblies are fabricated shall be of wrought or cast metal as shown or specified and physical properties, including tempers, of the metals shall be suitable for their intended use. All metals shall be free of defects that will affect their strength or durability and where exposed to view in the finished work, edges, and surfaces shall be without burrs, gouges, scratches, or other blemishes that mark their appearance.
Exposed welds and brazed or soldered joints shall be ground smooth; polished or other surfaces with applied finishes shall be protected against damage or defacement of any kind. Assemblies shall be of the manufacturer's standard construction except where indicated or specified otherwise. Permanent connections for components subject to impact or other live loads shall be effected by welding, riveting or other approved methods.
Welding shall conform to UNI 4634 and shall be accomplished so as to prevent permanent distortion of the connected parts. Bolts, screws and similar suitable fastenings shall be used for anchoring or securing miscellaneous metal work to supporting construction unless indicated otherwise. The Contractor shall verify all measurements and shall take field measurements before fabrication. Material and parts to complete each item shall be included, even though such work is not definitely shown or specified. Miscellaneous bolts and anchors, supports, braces and connections for installation and completion of the miscellaneous metalwork shall be provided.
SUBMITTALS
Data
Data shall be sufficient to show conformance to specified requirements; submit complete descriptive data on the following materials:
a. Downspout boots
b Expansion fasteners, anchors, bolts and miscellaneous fastening devices
c. Fire extinguisher cabinet
d. Seismic joint cover
e. Steel gratings
Drawings
Submit templates and erection and installation details indicating thickness, type, grade, class of metal and dimensions. Show construction details, reinforcement, anchorage and installation in relation to the building construction:
a. Handrails, guardrails and handrail/guardrail assemblies
b. Rung Ladders
c. Miscellaneous plates and shapes
d. Angle lintels
e. Pipe sleeves
f. Mirror frames
g. Seismic joint covers
h. Steel gratings
Shop drawings, descriptive data and samples shall be approved before items are delivered to the job site. The drawings shall show materials, connections, finish and all pertinent details.
DELIVERY, STORAGE AND HANDLING
Protect from corrosion, deformation, and other types of damage. Store items in an enclosed area free from contact with soil and weather. The Contractor shall replace all damaged items.
QUALIFICATION OF WELDERS
Qualify welders in accordance with UNI 4630-60 using procedures, materials, and equipment of the type required for the work.
MATERIALS
The thickness indicated or specified are minimum. Unless specified otherwise, materials shall be in accordance with the following specifications and standards as applicable. Material not otherwise specified herein shall conform to the requirements of Law 1086.
Structural Steel. Aluminum Alloy (Extruded)
Fittings for Steel Pipe
Standard malleable iron fittings.
Hardware
Provide as an integral part of miscellaneous metal items.
Anchors and Fasteners
Where exposed, shall be of the same material, color and finish as the metal to which applied.
Expansion Shields
Provide of group, type, class and style best suited for the purpose. Provide shields recessed not less than 60 millimeters into concrete or masonry unless indicated otherwise. Lag and Screws or Bolts Type and grade best suited for the purpose.
Hot Dip Galvanizing
All exposed items shall be hot dipped galvanized.
DISSIMILAR MATERIALS
Where dissimilar metals are in contact or where aluminum is in contact with concrete, mortar, masonry, wood or absorptive materials subject to wetting, protect the surfaces with a coat of bituminous paint or a coat of zinc chromate primer to prevent galvanic or corrosive action.
FABRICATION
By mechanics skilled in the trade and in accordance with the manufacturer's directions. Metal work shall be well formed to shape and size, with sharp lines and angles and true curves. All work fabricated to allow for expansion and contraction of materials. Provide welding and bracing of adequate strength and durability with tight, flush joints dressed smooth and clean.
Measurements
Before fabrication, take necessary field measurements and verify all related conditions and measurements.
Metal Surfaces
Shall be clean and free from mill scale, rust flakes and rust pitting; well formed and finished to shape and size, with sharp lines and angles and smooth surfaces. Shearing and punching shall leave clean true lines and surfaces. Weld or rivet permanent connections. Welds and flush rivets shall be used and finished flush and smooth on surfaces that will be exposed after installation. Do not use screws or bolts where they can be avoided; when used, heads shall be countersunk, screwed up tight and threads nicked to prevent loosening.
Construction
Thickness of metal and details of assembly and supports shall give ample strength and stiffness for the minimum loads specified or indicated. Joints exposed to weather shall be formed to exclude water.
Fastening
Provide the necessary rebates, lugs and brackets so that the work can be assembled in a neat, substantial manner. Holes for bolts and screws shall be drilled. Built-up parts shall be out of wind. Joints exposed to the weather shall be formed to exclude water. Conceal fastenings where possible.
Shop Fabrication
Fabrication and assembly shall be done in the shop to the greatest extent possible.
Drilling and Punching
Shall produce clean, true lines and surfaces.
Welding and Riveting
Welding shall be continuous along the entire area of contact, except where tack welding is permitted. Exposed connections of work in place shall not be tack welded. Exposed welds shall be ground smooth with the adjacent surfaces. Exposed surfaces of work in place shall have a smooth finish, and exposed riveting and screw heads shall be flush.
Joints
Where tight fits are required, mill joints to a close fit. Corner joints shall be coped or mitered, well formed, and in true alignment.
WORKMANSHIP
Fabricate metalwork in accordance with approved drawings, cuts, details and samples. Work shall be accurately set to established lines and elevations and securely fastened in place.
MISCELLANEOUS ITEMS
Gratings
Bars and frame shall be cast-iron, type B125, in compliance with UNI EN 124 norm.
Rung Ladders
Fabricate vertical rung ladders of UPN 80 steel profile for the side members, and 22 millimeter diameter steel rods for rungs, and 50x5 millimeters flats for the protective cage. Provide rungs of not less than 678 millimeter wide, spaced maximum 300 millimeters apart, welded and headed into side members. Install ladders so that the distance from the rungs to the finished wall surface will not be less than 180 millimeters. Secure to the adjacent construction with anchorages secured to masonry with steel expansion bolts and as shown on drawings. Ladders shall be galvanized steel.
Fire Extinguisher and Hose Cabinets
Fire extinguisher shall be made of galvanized sheet metal 1 millimeter thick, as shown on drawings. Finishing shall be baked red enamel paint. Size shall be as shown on drawings. Door shall have a glass panel front, pull and key lock latch, and continuous hinge.
Mirror Frames
Mirror frames shall be made of stainless steel. Finish shall be satin.
Seismic Joint Covers
Shall be 10/10mm thick stainless steel with satin finish. Use lengths over 3 meters where possible. Anchor firmly to adjacent construction.
Miscellaneous Plates and Shapes
Provide for items that do not form a part of the structural framework, such as lintels, sill angles, support framing for soffits, windows, miscellaneous mountings and frames to complete the work.
Angle Lintels/Ledgers
Provide galvanized steel double “T” beams to support unit masonry at wall openings and as otherwise indicated. Anchor beams to the existing or new masonry. The beam flanges shall extend no closer than 20 millimeters to the exterior face of the unit masonry.
Sleeves
Fit all pipes passing through concrete or masonry construction with galvanized steel pipe sleeves. Extend each sleeve through its respective wall and cut flush with each surface. Provide sleeves at least 25 millimeters greater in diameter than the pipe passing through them. Calk sleeve and pipe with a bituminous cement after the piping is installed and tested. Sleeves crossing REI walls shall be sealed with materials with fire resistance equal or above the fire resistance of the wall crossed.
Downspout Boots
Shall be cast-iron with receiving bells sized to fit downspouts. Dimensions are shown on drawings.
Handrails, Guardrails, Studs, Plates, and Fastening Devices
Design handrails to resist a concentrated load of 100 kilograms in any direction at any point of the top of the rail. Provide steel handrails, including inserts in concrete. Handrails shall be 50 millimeter diameter, nominal size, shall be hot-dip galvanized and shop painted. Dimensions of various items are shown on drawings.
a. Fabrication: Joint posts, rail, and corners by one of the following methods.
1. Mitered and welded joints made by fitting post to top rail and intermediate rail to post, mitering corners, groove welding joints, and grinding smooth. Butt railing splices and reinforce them by a tight fitting interior sleeve not less than 150 millimeters long, unless otherwise noted.
2. Railings may be bent at corners in lieu of jointing, provided bends are factory made in suitable jigs and the pipe is not crushed.
Installation
Installation of the various metals items shall be performed as shown on drawings.
Recessed Aluminum Floor Grate and Frame
Recessed Aluminum Floor Grate
Provide recessed aluminum floor grates at entrance door. The grate shall be recessed flush with finish floor and surrounded by an aluminum edge trim cast into the concrete floor. The floor grate shall be supported within the recess as standard with the manufacturer. The grate shall be fully removable for cleaning.
Floor Grate Frames
Recessed frames for aluminum floor grate shall be of extruded aluminum. All covers shall be mitered at 45 degree angles to assure accurate fitting. Determine depth of recess by the grate thickness. Anchor frames in concrete by casting in the concrete floor.
INSTALLATION
Install items at locations indicated according to manufacturer's instructions. Items listed below require additional procedures.
ANCHORAGE, FASTENINGS, AND CONNECTIONS
Anchorage
Provide anchorage for fastening work securely in place. Set anchors in concrete as the work progresses and space not more than 600 mm on center unless indicated otherwise. Sizes, kinds, and spacings of anchors not indicated or specified shall be necessary for the purpose, as approved. Anchorage not otherwise specified or indicated includes slotted inserts, expansion shields, and powder-driven fasteners, when approved for concrete; toggle bolts and through bolts for masonry; machine and carriage bolts for steel; through bolts, lag bolts and screws for wood.
Provide inserts of suitable and approved types where required for support or anchorage of equipment and finish construction. Inserts shall be gray or malleable iron castings or galvanized steel unless indicated or specified otherwise. Slotted inserts shall be types required to engage with anchors. Except where specified otherwise, all anchors and anchor bolts in exterior wall shall be zinc-coated and all other anchors and anchor bolts shall be heavily coated with bituminous paint.
Fastenings
Do not use wood plugs in any material, except as specified differently. Use non-ferrous attachments for non-ferrous metal. Make exposed fastenings of compatible materials, generally matching in color and finish, and harmonizing with the material to which fastenings are applied. Conceal fastenings where practicable. Drill and punch to provide clean true lines and surfaces. Countersink metal work to receive hardware.
Threaded Connections
Connections shall conform to the minimum standard connections as indicated in Italian Law 1086. Make threaded connections up tight so that threading is entirely concealed. Make bolted work up tight and nick the threads or bush the stem to prevent loosening. Rivet, bolt, and screw heads shall be flat and countersunk in exposed work and elsewhere as required.
Anchors and Connecting Members
Provide in concrete or masonry as the work progresses, to avoid unnecessary cutting and drilling. Cut, fit and drill as necessary so all materials are properly set in place and to permit engaging work to be properly installed.
Built-In-Work
All metal work built-in with concrete or masonry shall be formed for anchorage, or be provided with suitable anchoring devices as shown or as required. Furnish metal work in ample time for securing in place as the work progresses.
WELDING
Weld in a manner to prevent permanent distortion to the connected parts. Weld continuously along the entire area of contact except where tack welding is permitted. Do no tack weld exposed connections. Grind smooth all welds that will be visible in the finished installation. In addition, see welder's qualifications above.
FINISHES
Galvanizing
Hot-dip galvanize items specified to be zinc-coated, after fabrication where practicable. Galvanize anchor bolts, grating fasteners, washers and parts or devices necessary for proper installation unless indicated otherwise.
Repair of Zinc-Coated Surfaces
Repair surfaces damaged by welding or other means with galvanizing repair paint or by the application of stick or thick paste material specifically designed for repair of galvanizing, as approved. Clean areas to be repainted and remove the slag from the welds. Surfaces to which stick or paste material is applied, shall be heated with a torch to a temperature sufficient to melt the metallics in stick or paste; spread the molten material uniformly over surfaces to be coated and wipe the excess material off.
Shop Cleaning and Painting
After surface preparation, apply pretreatment and primer as specified. Do not coat surfaces of items to be embedded in concrete. Recoat damaged surfaces using surface preparation, treatment, primer and paint that were applied to the adjacent surfaces upon completion of work. Do no apply bituminous protective coatings to items to be finish painted.
Environmental Conditions
Do not clean or paint surface when they are damp or exposed to foggy or rainy weather or when the surface temperature is below 7 degrees Centigrade or over 35 degrees Centigrade unless approved by the Contracting Officer.
Surface Preparation
Unless otherwise specified herein, wash cleaned surfaces which become contaminated with rust, dirt, oil, grease or other contaminants with solvents until thoroughly clean. Insure that steel to be embedded in concrete is free of dirt and grease. Do not paint or galvanize bearing surfaces, including contact surfaces within friction-type joints, but coat them with an approved rust preventative, applied in the shop.
Remove such coating just prior to field erection using a remover approved by the rust preventative manufacturer. Insure that the surfaces, when assembled, are free from rust, grease, dirt and other foreign matter. Clean steel and iron work by power wire brushing or other approved manual or mechanical means, for removal of rust, loose paint, scale and deleterious substances. Wash cleaned surfaces which become contaminated with rust, dirt, oil, grease or other foreign matter, with solvents until thoroughly clean. The cleaning of steel to be embedded in concrete is not required.
Pretreatment, Priming and Painting
Apply pretreatment, primer and paint in accordance with the manufacturer's standard practice. On surfaces that will be concealed in the finished construction or that will not be accessible for finish painting, apply an additional prime coat to a minimum dry film thickness of 3 microns. Tint the additional prime coat with a small amount of tinting pigment.
Nonferrous Metal Surfaces
Protect by plating, anodic, organic, or other coatings as specified.
Aluminum Surfaces
Surface Condition
Before finishes are applied, exposed aluminum sheets, plates, and extrusions shall be free of roll marks, scratches, rolled-in scratches, kinks, stains, pits, orange peel, die marks, structural streaks, and any other defects which will affect uniform appearance of finished surfaces.
Aluminum
Unexposed sheet, plate and extrusions may have mill finish as fabricated.