MODULAR RAILINGS
PART 1 - GENERAL
1.1 SUMMARY
A.
This section
includes the following:
1.
Ornamental
railings with metal inlay panels
2. Glass railing systems
B.
Related
Sections: The following sections contain
requirements that relate to this section:
1.
Division 5
Section “Metal Fabrications” for metal fabrications made from heavy-gage
ferrous metal for nonornamental purposes.
2. Division 5 Section “Sheet Metal Fabrications” for metal fabrications made from sheet metal.
3. Division 5 Section “Ornamental Handrails and Railings” for ornamental metal handrails fabricated from stock components.
1.2 PERFORMANCE
REQUIREMENTS FOR HANDRAIL AND RAILING SYSTEMS
B.
Structural
Performance of Handrails and Railing Systems: Engineer, fabricate and install
handrails and railing systems to withstand the following structural loads
without exceeding the allowable design working stress of the materials for
handrails, railing systems, anchors, and
connections. Apply each load to produce
the maximum stress in each of the respective components comprising handrails
and railing systems.
1.
Top Rail of
Guardrail Systems: Capable of
withstanding the following loads applied as indicated:
a.
Concentrated
load of 200 lbf (890 N) applied at any point and in any direction.
b.
Uniform load
of 50 lbf per linear foot (730 N/m) applied horizontally and concurrently with
uniform load of 100 lbf per linear foot (1460 N/m) applied vertically downward.
c.
Concentrated
and uniform loads above need not be assumed to act concurrently.
2.
Handrails
Not Serving as Top Rails: Capable of
withstanding the following loads applied as indicated:
a.
Concentrated
load of 200 lbf (890 N) applied at any point and in any direction.
b.
Uniform load
of 50 lbf per linear foot (730 N/m) applied in any direction.
c.
Concentrated
and uniform loads above need not be assumed to act concurrently.
3.
Infill Area
of Guardrail Systems: Capable of
withstanding a horizontal concentrated load of 200 lbf (890 N) applied to 1 sq.
ft. (0.09 sp. M) at any point in the system, including panels, intermediate rails,
balusters, or other elements composing the infill area.
a.
Above load
need not be assumed to act concurrently with loads on top rails of railing
systems in determining stress of guard.
B.
Thermal
Movements: Allow for thermal movement
resulting from the following maximum change (range) in ambient temperature in
engineering, fabricating, and installing handrails and railing systems to
prevent buckling, opening of joints, overstressing of components and
connections, and other detrimental effects.
Base engineering calculation on actual surface temperatures of materials
due to both solar heat gain and nighttime sky heat loss.
1.
Temperature
Change (Range): 120 deg F (67 deg C),
ambient; 180 deg F (100 deg C), material surfaces.
C.
Control of
Corrosion: Prevent galvanic action and
other forms of corrosion by insulating metals and other materials from direct
contact with incompatible materials.
1.3
SUBMITTALS
A.
General: Submit each item in this Article according to
the Conditions of the Contract and Division 1 Specification Sections.
B.
Samples:
Submit samples of specified finishes for architectural approval.
C.
Prepare
handrail and railing systems shop drawings under the supervision of a qualified
professional engineer. Shop drawings shall show fabrication and installation of
ornamental metalwork including plans, elevations, details of components, and
attachments to other units of Work.
Indicate materials and profiles of each ornamental metalwork member,
fitting, joinery, finishes, fasteners, anchorages, and accessory items.
1.
Include
setting drawings, templates, and directions for installation of anchor bolts
and other anchorages to be installed as unit of Work of other sections.
2.
For
installed products indicated to comply with certain design loadings, include
structural analysis data sealed and signed by the qualified professional
engineer who was responsible for their preparations.
D.
Qualification
data for firms and persons specified in the “Quality Assurance” Article to
demonstrate their capabilities and experience.
Include lists of completed projects with project names and addresses,
names and addresses of architects and owners, and other information specified.
1.4
QUALITY ASSURANCE
A.
Fabricator
Qualifications: Firm with five years
experience in successfully producing ornamental metalwork similar to that
indicated for this Project and with sufficient production capacity to produce
required units without delaying the Work.
B.
Installer
Qualifications: Arrange for installation
by installer with five years of experience successfully installing stainless
steel railing systems and with sufficient capacity to perform project and not
delay the work.
C.
Engineer
Qualifications: Professional engineer
legally authorized to practice in jurisdiction where Project is located and experienced
in providing engineering services of the kind indicated that have resulted in
the installation of assemblies similar to this Project in material, design, and
extent and that have a record of successful in-service performance.
1.5
DELIVERY, STORAGE, AND HANDLING
A.
Store
ornamental metalwork inside a conditioned area, away from uncured concrete and
masonry, and protected from weather, moisture, soiling, abrasion, extreme
temperatures, and humidity.
1.6
PROJECT CONDITIONS
A.
Field
Measurements: Where ornamental rails are
indicated to fit to other construction, check actual dimensions of other
construction by accurate field measurements before fabrication; show recorded
measurements on final shop drawings.
Coordinate fabrication schedule with construction progress to avoid
delaying the Work.
1.
Where field
measurements cannot be made without delaying the Work, General Contractor will
guarantee dimensions and Ornamental Metal Rail Fabricator will proceed with
fabricating ornamental metalwork without field measurements. General Contractor
will coordinate construction to ensure that actual dimensions correspond to
guaranteed dimensions.
PART 2 - PRODUCTS
2.1 MANUFACTURERS
A.
Manufacturer: Subject to compliance with requirements,
provide products of one of the following:
1.
Custom
Railings:
a.
Big D
Metalworks - Phillip Hoppman (800) 299-9767 or (214) 638-8753
2.2 METALS
A.
General: Provide metals free from surface blemishes
where exposed to view in the finished unit.
Exposed-to-view surfaces exhibiting pitting, seam marks, roller marks,
stains, discolorations, or other imperfections on finished units are not
acceptable.
B.
Stainless
Steel: Grade and type designated below
for each form required:
1.
Tubing: ASTM A 554, grade as follows:
a.
b.
C.
Steel and
Iron: Provide steel and iron in the form
indicated complying with the following requirements:
1.
Tubing:
Cold-formed, ASTM A 500.
2.3
GLASS
A.
Tempered
Glass: ASTM C 1048, Kind FT (Fully Tempered), Condition A (uncoated), Type 1
(transparent glass, flat), Quality q3 (glazing select). Provide products
complying with requirements indicated below for class, thickness, and
manufacturing process that have been tested for surface and edge compression
according to ASTM C 1048 and for impact strength according to 16 CFR, Part 1201
for Category II materials.
1.
Clear Glass:
Class 1 (clear).
2.
Thickness:
12.0 mm. (3/8 inch) unless otherwise required to meet design load.
3.
Manufacturing
Process: Manufactured fully tempered glass by horizontal (roller-hearth)
process with roll-wave) distortion parallel with bottom edge of glass as
installed.
4.
Subject to
compliance with requirements, provide safety glass permanently marked with
certification label of Safety Glazing Certification Council or another
certification agency acceptable to authorities having jurisdiction.
5.
All exposed
edges will be polished and corners dubbed (rounded).
2.4
FABRICATING HANDRAILS AND RAILINGS
A.
Non-welded
Connections: Fabricated railing systems
and handrails to interconnect members with concealed mechanical fasteners and
fittings, unless otherwise indicated.
Fabricate members and fittings to produce flush, smooth, rigid, hairline
joints.
B.
Welded
Connections: Fabricate handrails and
railing systems of materials indicated below to interconnect members by welding. Use welding method that is appropriate for
metal and finish indicated and that develops strength required to comply with
structural performance criteria. Finish
exposed welds and surfaces smooth, flush, and blended to match adjoining
surfaces. Utilize #1A finish per Big D Metalworks Guideline and Joint
Finishes, as guide to finishing quality.
1.
Provide mechanical
connections for field splices stainless-steel handrails and railing systems.
2.
Provide
mechanical connections for field splices ferrous handrails and railing systems.
C.
Form changes
in direction of railing members as follows:
1.
As detailed.
2.
By radius
bends of radius indicated.
3.
By flush
radius bends.
4.
By bending.
5.
By mitering
at elbow bends.
6.
By inserting
prefabricated flush elbow fittings.
7.
By any method
indicated above applicable to change of direction involved.
D.
Provide wall
returns at ends of wall-mounted handrails, unless otherwise indicated; close
ends of returns, with prefabricated and fittings.
2.5
INSTALLATION
1.
Installation
A.
Installation
shall be by Big D Metalworks or a qualified, authorized representative of the
manufacturer.
B.
Installation
must be in accordance with standard or non-standard, yet applicable details
(instructions) provided by the manufacturer.
C.
Install
components plumb and in-line, accurately fitted, free from distortion or
defects and securely anchored to structure.
D.
Provide
anchors, plates, angles, etc., necessary for connecting railings to structure.
E.
Any and all
field welding shall be by a certified welder.
F.
Access must
be made available for anchors that require through bolting either vertically or
horizontally.
2.
Erection
Tolerances.
A.
Maximum
variation from plumb will be ¼”.
B.
Maximum
offset from true alignment for every 50-foot of railing shall be ¼”, non-cumulative.
3.
Protection
after installation.
A.
Provide
protective covering on all hand and guardrails if construction is not yet
finished in the area.
4.
Maintenance
and cleaning.
B.
Railings
shall be cleaned, including infill panels, by contractor to the satisfaction of
the owner.
1.
Wipe with
moistened cloth only. Do not use cleaning agents with abrasive or acid/alkaline
content.
5.
Correction
of deficiencies.
A.
Restore
finishes damaged during installation and construction period so no evidence
remains of correction work. Return items that cannot be refinished in field to
shop; make required alterations and refinish entire unit, or provide new units.
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