DESIGN A/E NOTE - GUIDE SPECIFICATION CONVENTIONS

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Rev 19JUN09 j:\Projects\Active\com-deca_design_criteria_revisions-04071\Guide Specifications\TJG Innformation

SECTION 05521

PIPE RAILINGS

This Section specifies certain requirements and procedures pertaining to sustainable resources and construction practices that are to be performed by the Contractor.

This Section does not specify requirements for planning and design which are addressed in the DeCA Design Criteria Handbook Division 1 Section 01115, DeCA Sustainable Design Requirements, that are the responsibility of the A/E.

PART 1 - GENERAL

1.1SUMMARY

1.1.1.Section Includes

  1. Steel pipe railings.

1.1.2.Related Sections

  1. Division1 Section " DeCA Sustainable Design Requirements " for recycled content of steel products.

1.2PERFORMANCE REQUIREMENTS

1.2.1.General

  1. In engineering railings to withstand structural loads indicated, determine allowable design working stresses of railing materials based on the following:

(1)Steel: 72 percent of minimum yield strength.

1.2.2.Structural Performance

  1. Provide railings capable of withstanding the effects of gravity loads and the following loads and stresses within limits and under conditions indicated:
  2. Handrails and Top Rails of Guards:

(1)Uniform load of 50 lbf/ ft. applied in any direction.

(2)Concentrated load of 200 lbf applied in any direction.

(3)Uniform and concentrated loads need not be assumed to act concurrently.

  1. Infill of Guards:

(1)Concentrated load of 50 lbf applied horizontally on an area of 1 sq. ft..

(2)Infill load and other loads need not be assumed to act concurrently.

1.2.3.Thermal Movements

  1. Allow for thermal movements from ambient and surface temperatures acting on exterior railings by preventing buckling, opening of joints, overstressing of components, failure of connections, and other detrimental effects.

(1)Temperature Change (Range): 120 deg F, ambient; 180 deg F, material surfaces.

1.2.4.Control of Corrosion

  1. Prevent galvanic action and other forms of corrosion by insulating metals and other materials from direct contact with incompatible materials.

1.2.5.Delegated Design

  1. Design railings, including comprehensive engineering analysis by a qualified professional engineer, using performance requirements and design criteria indicated.

1.3SUBMITTALS

1.3.1.Shop Drawings

  1. Include plans, elevations, sections, details, and attachments to other work.

(1)For installed products indicated to comply with design loads, include structural analysis data signed and sealed by the qualified professional engineer responsible for their preparation.

1.3.2.Welding Certificates.

1.3.3.Special Inspection reports on shop and field bolted connections, and welded connections.

1.3.4.Delegated-Design Submittal

  1. For installed products indicated to comply with performance requirements and design criteria, including analysis data signed and sealed by the qualified professional engineer responsible for their preparation.

1.3.5.Sustainable Design Submittals:

  1. Product Data

(1)Indicating percentages by weight of postconsumer and preconsumer recycled content for products having recycled content. Include statement indicating costs for each product having recycled content. (Credit MR4.1)

1.3.6.Submittal List

ReferenceSubmittal ItemQuantityAction

1.3.1Shop DrawingsXR

1.3.2Welding CertificatesXR

1.3.3Special Inspection ReportsXR

1.3.4Delegated-Design SubmittalXR

1.3.5Sustainable Design SubmittalsXI

XSubmit quantity specified in Division 1 Section “Administrative Requirements.”

RReview each submittal, mark to indicate action taken, and return.

ISubmittal is for information or record purposes only. No action will be taken.

1.4QUALITY ASSURANCE

1.4.1.Source Limitations

  1. Obtain each type of railing through one source from a single manufacturer.

1.4.2.Welding Qualifications

  1. Qualify procedures and personnel according to the following:

(1)AWSD1.1/D1.1M, "Structural Welding Code--Steel."

1.4.3.Special Inspector Qualifications

  1. Special Inspections for bolted and welded connections, and steel details shall be performed under the direct supervision of a Professional Engineer registered in the State in which the project is located. The personnel performing the inspections shall be ICC-certified Structural Steel and Welding Special Inspection or an equivalent certification program.

1.5PROJECT CONDITIONS

1.5.1.Field Measurements

  1. Verify actual locations of walls and other construction contiguous with railings by field measurements before fabrication.

1.6COORDINATION AND SCHEDULING

1.6.1.Coordinate Installation Of Anchorages For Railings

  1. 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.

1.6.2.Scheduling

  1. Schedule installation so wall attachments are made only to completed walls. Do not support railings temporarily by any means that do not satisfy structural performance requirements.

PART 2 - PRODUCTS

2.1METALS, GENERAL

2.1.1.Metal Surfaces, General

  1. Provide materials with smooth surfaces, without seam marks, roller marks, rolled trade names, stains, discolorations, or blemishes.

2.1.2.Brackets, Flanges, and Anchors

  1. Cast or formed metal of same type of material and finish as supported rails, unless otherwise indicated.

2.2STEEL

2.2.1.Pipe: ASTMA53/A53M

  1. TypeF or TypeS, GradeA, Standard Weight (Schedule40), unless another grade and weight are required by structural loads.
  2. Provide galvanized finish for exterior installations.

2.2.2.Plates, Shapes, and Bars: ASTMA36/A36M.

2.3FASTENERS

2.3.1.Steel Railings

  1. Ungalvanized-Steel Railings: Plated steel fasteners complying with ASTMB633 or ASTMF1941, ClassFe/Zn 25 for electrodeposited zinc coating.
  2. Hot-Dip Galvanized Railings: Type304 stainless-steel or hot-dip zinc-coated steel fasteners complying with ASTMA153/A153M or ASTMF2329 for zinc coating.

2.3.2.Fasteners for Anchoring Railings to Other Construction

  1. Select fasteners of type, grade, and class required to produce connections suitable for anchoring railings to other types of construction indicatedand capable of withstanding design loads.

2.3.3.Fasteners for Interconnecting Railing Components

  1. Provide concealed fasteners for interconnecting railing components and for attaching them to other work, unless exposed fasteners are unavoidable or are the standard fastening method for railings indicated.
  2. Provide Phillips flat-head machine screws for exposed fasteners, unless otherwise indicated.

2.3.4.Anchors

  1. Provide cast-in-place, chemical, or torque-controlled expansion anchors, fabricated from corrosion-resistant materials 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 for Interior Locations: Carbon-steel components zinc-plated to comply with ASTMB633 or ASTMF1941, ClassFe/Zn5, unless otherwise indicated.

(2)Material for Exterior Locations: Alloy Group1(A1) stainless-steel bolts, ASTMF593, and nuts, ASTMF594.

2.4MISCELLANEOUS MATERIALS

2.4.1.Welding Rods and Bare Electrodes

  1. Select according to AWS specifications for metal alloy welded.

2.4.2.Shop Primers

  1. Provide primers that comply with Division9 painting Sections.

2.4.3.Galvanizing Repair Paint

  1. High-zinc-dust-content paint for regalvanizing welds in steel, complying with SSPC-Paint20 and compatible with paints specified to be used over it.

2.4.4.Nonshrink, Nonmetallic Grout

  1. Factory-packaged, nonstaining, noncorrosive, nongaseous grout complying with ASTMC1107. Provide grout specifically recommended by manufacturer for interior and exterior applications.

2.4.5.Anchoring Cement

  1. Factory-packaged, nonshrink, nonstaining, hydraulic-controlled expansion cement formulation for mixing with water at Project site to create pourable anchoring, patching, and grouting compound.

(1)Water-Resistant Product: At exterior locations and where indicated provide formulation that is resistant to erosion from water exposure without needing protection by a sealer or waterproof coating and that is recommended by manufacturer for exterior use.

2.5FABRICATION

2.5.1.General

  1. Fabricate railings to comply with requirements indicated for design, dimensions, member sizes and spacing, details, finish, and anchorage,but not less than that required to support structural loads.
  2. Assemble railings 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. Use connections that maintain structural value of joined pieces.
  3. Cut, drill, 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.
  4. Form work true to line and level with accurate angles and surfaces.
  5. Fabricate connections that will be exposed to weather in a manner to exclude water. Provide weep holes where water may accumulate.
  6. Cut, reinforce, drill, and tap as indicated to receive finish hardware, screws, and similar items.
  7. Connections: Fabricate railings with welded connections, unless otherwise indicated.
  8. 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.

(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 flux immediately.

(4)At exposed connections, finish exposed surfaces smooth and blended so no roughness shows after finishing and welded surface matches contours of adjoining surfaces.

  1. Form changes in direction as detailed.
  2. Close exposed ends of railing members with prefabricated end fittings.
  3. Provide wall returns at ends of wall-mounted handrails, unless otherwise indicated. Close ends of returns unless clearance between end of rail and wall is 1/4 inch or less.
  4. Brackets, Flanges, Fittings, and Anchors: Provide wall brackets, flanges, miscellaneous fittings, and anchors to interconnect railing members to other work, unless otherwise indicated.

(1)At brackets and fittings fastened to gypsum board partitions, provide fillers made from crush-resistant material, or other means to transfer wall loads through wall finishes to structural supports and prevent bracket or fitting rotation and crushing of substrate.

  1. Provide inserts and other anchorage devices for connecting railings to concrete or masonry work. Fabricate anchorage devices capable of withstanding loads imposed by railings. Coordinate anchorage devices with supporting structure.
  2. For railing posts set in concrete, provide steel sleeves not less than 6 inches long with inside dimensions not less than ½ inch greater than outside dimensions of post, with steel plate forming bottom closure.

2.6STEEL FINISHES

2.6.1.Galvanized Railings:

  1. Hot-dip galvanizeexterior steel railings, including hardware, after fabrication.
  2. Comply with ASTMA123/A123M for hot-dip galvanized railings.
  3. Comply with ASTMA153/A153M for hot-dip galvanized hardware.

2.6.2.General

  1. Fill vent and drain holes that will be exposed in the finished Work, unless indicated to remain as weep holes, by plugging with zinc solder and filing off smooth.
  2. For galvanized railings, provide hot-dip galvanized fittings, brackets, fasteners, sleeves, and other ferrous components.
  3. For nongalvanized steel railings, provide nongalvanized ferrous-metal fittings, brackets, fasteners, and sleeves.
  4. Preparation for Shop Priming: Prepare uncoated ferrous-metal surfaces to comply with SSPC-SP3, "Power Tool Cleaning."
  5. Apply shop primer to prepared surfaces of railings, unless otherwise indicated. Comply with requirements in SSPC-PA1, "Paint Application Specification No.1: Shop, Field, and Maintenance Painting of Steel," for shop painting. Primer need not be applied to surfaces to be embedded in concrete or masonry.

(1)Do not apply primer to galvanized surfaces.

PART 3 - EXECUTION

3.1EXAMINATION

Examine gypsum board assemblies, where reinforced to receive anchors, to verify that locations of concealed reinforcements have been clearly marked for Installer. Locate reinforcements and mark locations if not already done.

3.2INSTALLATION

3.2.1.General

  1. Fit exposed connections together to form tight, hairline joints.
  2. Perform cutting, drilling, and fitting required for installing railings. Set railings accurately in location, alignment, and elevation; measured from established lines and levels and free of rack.

(1)Do not weld, cut, or abrade surfaces of railing components that have been coated or finished after fabrication and that are intended for field connection by mechanical or other means without further cutting or fitting.

(2)Set posts plumb within a tolerance of 1/16 inch in 3 feet.

(3)Align rails so variations from level for horizontal members and variations from parallel with rake of steps and ramps for sloping members do not exceed 1/4 inch in 12 feet.

  1. Adjust railings before anchoring to ensure matching alignment at abutting joints.
  2. Fastening to In-Place Construction: Use anchorage devices and fasteners where necessary for securing railings and for properly transferring loads to in-place construction.

3.3RAILING CONNECTIONS

3.3.1.Welded Connections

  1. Use fully welded joints for permanently connecting railing components. Comply with requirements for welded connections in Part2 "Fabrication" Article whether welding is performed in the shop or in the field.

3.3.2.Expansion Joints

  1. Install expansion joints at locations indicated but not farther apart than required to accommodate thermal movement. Provide slip-joint internal sleeve extending 2 inches beyond joint on either side, fasten internal sleeve securely to 1 side, and locate joint within 6 inches of post.

3.4ANCHORING POSTS

3.4.1.General

  1. Use steel pipe sleeves preset and anchored into concrete for installing posts. After posts have been inserted into sleeves, fill annular space between post and sleeve with nonshrink, nonmetallic grout or anchoring cement, mixed and placed to comply with anchoring material manufacturer's written instructions.
  2. Form or core-drill holes not less than 5 inches deep and 3/4 inch larger than OD of post for installing posts in concrete. Clean holes of loose material, insert posts, and fill annular space between post and concrete with nonshrink, nonmetallic grout or anchoring cement, mixed and placed to comply with anchoring material manufacturer's written instructions.
  3. Leave anchorage joint exposed; wipe off surplus anchoring material; and leave 1/8-inch buildup, sloped away from post.

3.5ANCHORING RAILING ENDS

3.5.1.General

  1. Anchor railing ends to concrete and masonry with round flanges connected to railing ends and anchored to wall construction with anchors and bolts.
  2. Anchor railing ends to metal surfaces with flanges bolted to metal surfaces and welded to railing ends or connected to railing ends using nonwelded connections.

3.6ATTACHING HANDRAILS TO WALLS

3.6.1.General

  1. Attach handrails to wall with wall brackets. Provide brackets with 1-1/2-inch clearance from inside face of handrail and finished wall surface.
  2. Locate brackets as indicated or, if not indicated, at spacing required to support structural loads.
  3. Secure wall brackets to building construction as follows:

(1)For concrete and solid masonry anchorage, use drilled-in expansion shields and hanger or lag bolts.

(2)For hollow masonry anchorage, use toggle bolts.

  1. For steel-framed gypsum board partitions, fasten brackets directly to steel framing or concealed steel reinforcements using self-tapping screws of size and type required to support structural loads.

3.7QUALITY CONTROL

3.7.1.Quality Control Compliance

  1. Field quality control shall be in accordance with the Quality Control Plan.

3.7.2.Testing and Inspection

  1. Engage a special Inspector to perform field inspections and tests and to prepare test reports.
  2. Field and shop welds will be subject to testing and inspecting.
  3. Testing agency will report test results promptly and in writing to Contractor and Contracting Officer.
  4. Remove and replace work where test results indicate that it does not comply with specified requirements.
  5. Additional testing and inspecting, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements.

3.8ADJUSTING AND CLEANING

3.8.1.Touchup Painting

  1. Immediately after erection, clean field welds, bolted connections, and abraded areas of shop paint, and paint exposed areas with same material as used for shop painting to comply with SSPC-PA1 for touching up shop-painted surfaces.

3.8.2.Galvanized Surfaces

  1. Clean field welds, bolted connections, and abraded areas and repair galvanizing to comply with ASTMA780.

3.9PROTECTION