Base Build-Out, ANA Regional Brigade, Herat, Afghanistan AFHERATA

SECTION 05500

MISCELLANEOUS METAL

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the

extent referenced. The publications are referred to in the text by basic
designation only.

ALUMINUM ASSOCIATION (AA)

AA DAF-45 (1997) Designation System for Aluminum

Finishes

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

ASTM A 36/A 36M (2000a) Carbon Structural Steel

ASTM A 500 (1999) Cold-Formed Welded and Seamless

Carbon Steel Structural Tubing in Rounds
and Shapes

ASTM A 53/A 53M (2001) Pipe, Steel, Black and Hot-Dipped,

Zinc-Coated, Welded and Seamless

AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)

ASCE 7 (1998) Minimum Design Loads for Buildings

and Other Structures

AMERICAN WELDING SOCIETY (AWS)

AWS D1.1/D1.1M (2000) Structural Welding Code - Steel

NATIONAL ASSOCIATION OF ARCHITECTURAL METAL MANUFACTURERS (NAAMM)

NAAMM MBG 531 (1994) Metal Bar Grating Manual

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 211 (2000) Chimneys, Fireplaces, Vents, and

Solid Fuel-Burning Appliances

1.2 GENERAL REQUIREMENTS

The Contractor shall verify all measurements and shall take all field
measurements necessary before fabrication. Welding to or on structural
steel shall be in accordance with AWS D1.1/D1.1M or equivalent DIN, BS, or
EN standards. Items specified to be galvanized, when practicable and not
indicated otherwise, shall be hot-dip galvanized after fabrication.
Exposed fastenings shall be compatible materials, shall generally match in
color and finish, and shall harmonize with the material to which fastenings

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are applied. Materials and parts necessary to complete each item, even
though such work is not definitely shown or specified, shall be included.
Poor matching of holes for fasteners shall be cause for rejection.
Fastenings shall be concealed where practicable. Thickness of metal and
details of assembly and supports shall provide strength and stiffness.
Joints exposed to the weather shall be formed to exclude water.

1.3 DISSIMILAR MATERIALS

Where dissimilar metals are in contact, or where aluminum is in contact

with concrete, mortar, masonry, wet or pressure-treated wood, or absorptive
materials subject to wetting, the surfaces shall be protected with a coat
of bituminous paint or asphalt varnish.

1.4 WORKMANSHIP

Miscellaneous metalwork shall be well formed to shape and size, with sharp
lines and angles and true curves. Drilling and punching shall produce
clean true lines and surfaces. 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. Exposed surfaces of work in place shall have a smooth
finish, and unless otherwise approved, exposed riveting shall be flush.
Where tight fits are required, joints shall be milled. Corner joints shall
be coped or mitered, well formed, and in true alignment. Work shall be
accurately set to established lines and elevations and securely fastened in
place. Installation shall be in accordance with manufacturer's
installation instructions and approved drawings, cuts, and details.

1.5 ANCHORAGE

Anchorage shall be provided where necessary for fastening miscellaneous

metal items securely in place. Anchorage not otherwise specified or
indicated shall include slotted inserts made to engage with the anchors,
expansion shields, and power-driven fasteners when approved for concrete;
toggle bolts and through bolts for masonry; machine and carriage bolts for
steel; and lag bolts and screws for wood.

1.5.1 Power Driven Fasteners

Powder-Actuated Drive-Pin Fasteners: Powder-actuated-type, drive-pin

attachments with pull-out and shear capacities appropriate for supported
loads and building materials where used. Fastener system of type suitable
for application indicated, fabricated from corrosion-resistant materials,
with capability to sustain, without failure, a load equal to 10 times
design load.

1.6 ALUMINUM FINISHES

Unless otherwise specified, aluminum items shall have standard mill finish.
The thickness of the coating shall be not less than that specified for
protective and decorative type finishes for items used in interior
locations or architectural Class I type finish for items used in exterior
locations in AA DAF-45 or equivalent DIN, BS, or EN standards. Items to be
anodized shall receive a polished satin finish. Aluminum surfaces to be in
contact with plaster or concrete during construction shall be protected
with a field coat.

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1.7 SHOP PAINTING

Surfaces of ferrous metal except galvanized surfaces, shall be cleaned and

shop coated with the manufacturer's standard protective coating unless
otherwise specified. Surfaces of items to be embedded in concrete shall
not be painted. Items to be finish painted shall be prepared according to
manufacturer's recommendations or as specified.

PART 2 PRODUCTS

2.1 PIPE GUARDS

Pipe guards shall be heavy duty steel pipe conforming to ASTM A 53/A 53M,
Type E or S,, standard weight STD, electric resistance welded or seamless
with black finish.

2.2 HANDRAILS

Handrails shall be designed to resist a concentrated load of 890 N (200

pounds) in any direction at any point of the top of the rail or 292
Newtons per meter (20 pounds per foot) applied horizontally to top of the
rail, whichever is more severe.

2.2.1 Steel Handrails, Including Carbon Steel Inserts

Steel handrails, including inserts in concrete, shall be steel pipe

conforming to ASTM A 53/A 53M or equivalent DIN, BS or EN standards or
structural tubing conforming to ASTM A 500, Grade A or B of equivalent
strength. Steel railings shall be 50 mm nominal size. Railings shall be
hot-dip galvanized and shop painted. Pipe collars shall be hot-dip
galvanized steel.

a. Joint posts, rail, and corners shall be fabricated by one of the

following methods:

(1) Flush type rail fittings of commercial standard, welded and

ground smooth with railing splice locks secured with 10 mm
hexagonal recessed-head setscrews.

(2) Mitered and welded joints by fitting post to top rail and
intermediate rail to post, mitering corners, groove welding
joints, and grinding smooth. Railing splices shall be butted and
reinforced by a tight fitting interior sleeve not less than 150 mm
long.

(3) Railings may be bent at corners in lieu of jointing, provided

bends are made in suitable jigs and the pipe is not crushed.

b. Removable sections, toe-boards, and brackets shall be provided as

indicated.

2.3 LADDERS

Ladders shall be galvanized steel or aluminum, fixed rail type. Fabrication

of ladders shall consist of solid-section rod rungs fitted into holes in
bar side rails and welded. Splices in side rails shall be made using full
penetration welds and shall provide a flush and smooth transition between
connecting ends. All welds shall be ground smooth Ladder rails shall be
welded to bent-bar supporting brackets anchored to supporting structure as

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shown. Provide nonslip surfaces on top of each rung.

2.3.1 Ladder Cages

Fabricate 50 by 6 mmhorizontal bands and 40 by 5 mm vertical bars. Provide

attachments for fastening bands to the side rails of ladders or directly to
the structure. Provide and fasten vertical bars on the inside of the
horizontal bands. Extend cages not less than 690 mm or more than 710 mm
from the centerline of the rungs, excluding the flare at the bottom of the
cage, and not less than 690 mm in width. Clear the inside of the cage of
projections.

2.4 FLOOR GRATINGS AND FRAMES

Carbon steel grating shall be designed to meet the indicated load

requirements. Edges shall be banded with bars 6 mm less in height than
bearing bars for grating sizes above 19 mm. Banding bars shall be flush
with the top of bearing grating. Frames shall be of welded steel
construction finished to match the grating. Floor gratings and frames
shall be galvanized after fabrication.

2.5 STEEL STAIRS

Steel stairs shall be complete with structural or formed channel stringers,

steel plate treads and risers, landings, columns, handrails, and necessary
bolts and other fastenings as indicated. Structural steel shall conform to
ASTM A 36/A 36M. Stairs and accessories shall be painted. Risers on
stairs with metal pan treads shall be deformed to form a sanitary cove to
retain the tread concrete. Integral nosings shall have braces extended
into the concrete fill. Gratings for treads and landings shall conform to
NAAMM MBG 531. Grating treads shall have slip-resistant nosings.

2.6 CHIMNEYS, VENTS, AND SMOKESTACKS

Chimneys and vents shall be designed and constructed in accordance with

NFPA 211. Chimney connectors shall be formed of not lighter than 1.01 mm
(20 gauge) galvanized steel. Stacks shall be designed and constructed to
withstand a wind velocity of 122 km/h in accordance with ASCE 7. Unlined
stacks shall be constructed of black-steel plates not less than 5 mm thick
conforming to ASTM A 36/A 36M. Seams and joints shall be welded, except
that an angle flange shall be provided for connection to the boiler, other
equipment, and stack support.

2.7 MISCELLANEOUS

Miscellaneous plates and shapes for items that do not form a part of the
structural steel framework, such as lintels, sill angles, miscellaneous
mountings, and frames, shall be provided to complete the work.

2.8 SAFETY CHAINS

Safety chains shall be galvanized welded steel. Safety chains shall be

straight link style, 5 mm diameter, minimum 39 links per meter (12 links
per foot) and with bolt type snap hooks on each end. Eye bolts for
attachment of chains shall be galvanized 10 mm bolt with 19 mm eye,
anchored as indicated. Two chains shall be furnished for each guarded
opening.

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2.9 SHELVING

Shelving shall be capable of resisting a uniform load of 10 kg per meter.

Minimum dimensions and number of shelves shall be as indicated.

2.10 ACCESS PANELS

Prefabricated steel units, size(s) as indicated. Fabricate frame of

preformed angle or channel with welded joints. Perforate wide leg or
flange of frame section or extend frame section into expanded metal wings
to provide a key for the plaster. Cover shall be hinged or snap-on type
with turn-latch or spring catch. Fabricate access panels not larger than
600 by 900 mm from 1.8 mm thick steel with frames not lighter than 1.5 mm
thick. Fabricate access panels larger than 600 by 900 mm as indicated.
Factory-prime panels with rust-inhibitive paint.

2.11 MISCELLANEOUS METAL SUPPORTS

Provide miscellaneous steel framing and supports not specified in other

Sections as needed to complete the Work. Fabricate units from 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.

2.12 WINDOW SUB-SILL

Window sub-sill shall be of 20 gauge steel of size and design indicated.

Not less than two anchors per window section shall be provided for securing
into mortar joints of masonry sill course. Sills for banks of windows
shall have standard mill finish with a protective coating.

Product shall be Galvanized steel window sill 1 mm thick (20 gauge.

2.13 CLOTHES LINE ASSEMBLY

Fabricate clothe line assembly to comply with requirements indicated on

Drawing for design, dimensions, member sizes and spacing, details, finish,
and anchorage.

Assemble clothes line assembly in the shop to greatest extent possible to

minimize field splicing and assembly. Disassemble units only as necessary
for shipping and handling limitations. Clearly mark units for reassembly
and coordinated installation.

Make up wire-rope assemblies (clothes line cable) in the shop to

field-measured dimensions with fittings machine swaged. Minimize amount of
turnbuckle take-up used for dimensional adjustment so maximum amount is
available for tensioning wire ropes. Tag wire-rope assemblies and fittings
to identify installation locations and orientations for coordinated
installation.

Cut, drill, and punch metals cleanly and accurately. Remove burrs and ease
edges to a radius of approximately 1 mm (1/32 inch), unless otherwise
indicated. Remove sharp or rough areas on exposed surfaces.

Form work true to line and level with accurate angles and surfaces.

Fabricate connections that will be exposed to weather in a manner to

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exclude water. Provide weep holes where water may accumulate.

Cut, reinforce, drill, and tap as indicated to receive finish hardware,

screws, and similar items.

Welded Connections: Cope components at connections to provide close fit,

or use fittings designed for this purpose. Weld all around at connections,
including at fittings.

PART 3 EXECUTION

3.1 GENERAL INSTALLATION REQUIREMENTS

All items shall be installed at the locations shown and according to the
manufacturer's recommendations. Items listed below require additional
procedures as specified.

3.2 REMOVABLE ACCESS PANELS

A removable access panel not less than 300 by 300 mm shall be installed
directly below each valve, flow indicator, damper, or air splitter that is
located above the ceiling, other than an acoustical ceiling, and that would
otherwise not be accessible.

3.3 ATTACHMENT OF HANDRAILS

Toeboards and brackets shall be installed where indicated. Splices, where

required, shall be made at expansion joints. Removable sections shall be
installed as indicated.

3.3.1 Installation of Steel Handrails

Installation shall be masonry with expansion shields and bolts or toggle

bolts. Rail ends shall be secured by steel pipe flanges through-bolted to
a back plate or by 6 mm lag bolts to studs or solid backing.

3.4 DOOR GUARD FRAME

Door guard frame shall be mounted over the glazed opening using 6 mm lag
bolts on the interior of wood doors or tamperproof through bolts on the
interior of metal doors.

3.5 INSTALLATION OF PIPE GUARDS

Pipe guards shall be set vertically in concrete piers. Piers shall be

constructed of, and the hollow cores of the pipe filled with, concrete
specified in Section 03300 CAST-IN-PLACE STRUCTURAL CONCRETE, having a
compressive strength of 21 MPa.

3.6 INSTALLATION OF CHIMNEYS, VENTS, AND SMOKESTACKS

Chimneys and vents shall be installed in accordance with NFPA 211. A

cleanout opening with a tight-fitting, hinged, cast-iron door and frame
shall be provided at the base of each smokestack. A top band shall be
provided on stacks for attachment of painter's rigging. Roof housing, rain
cap, downdraft diverter, fire damper, and other accessories required for a
complete installation shall be provided. Sections of prefabricated lined
stacks shall be joined with acid-resisting high-temperature cement and
steel draw bands. Means to prevent accumulation of water in the smokestack

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shall be provided.

3.7 TRENCH FRAMES AND COVERS

Trench frames and covers shall finish flush with the floor.

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