ITEM 517 RAILINGS
517.01
Description
517.02
Fabrication
517.03
Materials
517.04 Construction
Methods, General
517.05 Steel
and Iron Railings
517.06 Aluminum
Railings
517.07 Method
of Measurement
517.08 Basis of
Payment
517.01 Description. This work consists of
furnishing, constructing, coating, and erecting the type of railing
specified. This work also consists of providing and galvanizing
structural posts, anchors, and connections.
517.02
Fabrication.
Fabricate railing according to Items 513. Select a
fabricator that is at least prequalified at level SF. The Department will
base final acceptance of fabricated members on the Engineer’s approval that the
fabricated items that can be successfully incorporated into the
structures. Submit mill test reports for structural steel, steel
castings, bronze, and sheet lead certified according to 501.06.
517.03 Materials. Furnish materials conforming to:
Concrete, Class QC
2........................................... 499, 511
Reinforcing
steel................................................... 509,
709
Structural
steel.............................................................. 513
Preformed fillers
.... (sponge
rubber or PVC)........................ 705.03,
711.28
Steel
tubing.............................................................. 707.10
Paint..............................................................................
708
Metal deep beam
rail................................................ 710.06
Ductile iron casings................................................. 711.13
Aluminum................................................................
711.20
Timber.....................................................................
711.26
Stainless steel
fasteners............................................ 730.10
Pipe..........................................................................
748.06
Submit mill test
reports for structural steel and aluminum according to 501.06.
517.04 Construction Methods, General. Construct
railings as shown on the plans. Install posts for metal railings normal
to the grade line. Install the tops of railings parallel to the grade
line.
Remove or
release shoring or falsework supporting the superstructure
before placing railing that has no expansion joints or that is on the concrete
parapet.
517.05 Steel and Iron Railings. Unless
specified to paint according to Item 514, galvanize all
parts of steel and iron railings.
Erect metal deep
beam rail elements according to Item 606.
517.06 Aluminum Railings. Use alloy
conforming to 711.20 for aluminum
railings.
Give the extreme
outer surfaces of cast railing posts a 40-grit finish. The Contractor is
not required to provide a special finish for other portions of railings.
Do not scratch, dent, or cause other damage to railings that may affect the
durability or appearance of the railing.
Use
galvanized steel anchor bolts and hexagon nuts conforming to 711.02. Coat the entire projecting
portion of anchor bolts and fill the space between the bolts and post base with
an aluminum-impregnated caulking compound.
Where
aluminum contacts concrete or stone masonry, thoroughly coat the contact
surfaces with an aluminum-impregnated caulking compound or with a heavy asphalt
material paint pigmented with aluminum powder or paste thereby providing an
aluminum appearance. Where aluminum or aluminum shims contacts different
metal, thoroughly coat the contact surface with an aluminum-impregnated
caulking compound or place a synthetic rubber impregnated fabric gasket between
the metals.
Weld
only where shown on the plans using inert gas shielded metal-arc or
tungsten-arc method without flux, or by other approved methods.
517.07 Method of Measurement. The
Department will measure Railing by the number of feet (meters) of railing
including end posts. If deep beam guardrail is used, the Department will
measure the length of railing between the first posts off the bridge excluding
the first posts off the bridge. If hand rails or tubular backup rails are
used, the Department will not measure any portions extending beyond the first
posts off the bridge. If twin steel tube bridge railing is used, the
Department will measure the length of the railing between the second post off the bridge including the second post.
517.08 Basis of Payment. The cost
of hand rails or tubular backup rails extending beyond the measured limits are
included for payment in the unit price bid for the measured length.
The
Department will pay for accepted quantities at the contract price as follows:
Item
Unit
Description
517
Foot
(Meter)
Railing (___)