ITEM
626 BARRIER REFLECTORS
626.01
Description
626.02
Materials
626.03 Layout
626.04
Installation
626.05 Method
of Measurement
626.06 Basis of
Payment
626.01 Description. This work consists of
furnishing and installing barrier reflectors on guardrail blockouts,
concrete barrier, retaining wall, and bridge parapets.
626.02 Materials. Furnish materials conforming to:
Barrier
Reflectors..................................................... 726.01
Conform
to the manufacturer’s recommendations for corrosion resistant fasteners,
brackets, or adhesives.
Use
barrier reflectors that are mountable on guardrail blockouts,
concrete barriers, retaining walls, and bridge parapets. For wall or
parapet mount, the barrier reflector may not extend further than 5 inches (125
mm) in a horizontal direction towards the traffic lanes.
626.03 Layout. Lay out all locations to ensure
proper placement. The Engineer will approve the layout before
installation of the reflectors.
Furnish
reflectors at the beginning and the end of all barrier runs and at least one
additional point evenly spaced between the termini. Space the reflectors
at 100 feet (30 m) on tangents and on curves of less than 5 degrees (more than
350 m radius). Space the reflectors at 50 feet (15 m) for curves of greater
than 5 degrees (350 m radius or less).
The
Contractor may vary the spacing on tangents and curves of less than 5 degrees
(more than 350 m radius) from 65 feet to 125 feet (20 m to 40 m) in the final
250 feet (80 m) to achieve even spacing of the reflectors.
If
using a buffer end section or similar device on the end of the guardrail, place
the first reflector so that it is visible to approaching traffic.
If
tying guardrails, barriers, retaining walls, or bridge parapets together in a
continuous run, use the total length of the run for determining the number and
location of reflectors.
If
installing a run of rail or barrier that is at varying distances from the edge
of pavement, place a reflector where the run first approaches closest to the
pavement. If this results in spacing greater than 125 feet (40 m), or 65
feet (20 m) in cases where 50-foot (15 m) standard spacing is required, install
an additional reflector. If a non-reflectorized impact attenuator is in
place, place an additional reflector on the face of the attenuator nearest to,
and directed toward, approaching traffic.
626.04 Installation. Attach the reflector with
a suitable corrosion resistant fastener or
adhesive conforming to the manufacturer’s recommendations.
On
concrete barriers, retaining walls, and bridge parapets, place the top of the
reflector so its height is 26 inches (650 mm) above the near edge of pavement,
except that the top of the reflector is at least 3 inches (75 mm) below the top
of the concrete barrier.
Install
guardrail blockout reflectors on the side of the blockout away from traffic. Install guardrail blockout reflectors on the side of the blockout
nearest the edge of pavement. Install the guardrail blockout
reflector so that the reflective surface is above the guardrail.
Remove
loose concrete, rust, dirt, and other loose material from the surface of the
concrete barrier using a wire brush. Remove dust created by wire brushing
before applying adhesive. Apply adhesive to clean and moisture-free
surfaces according to the manufacturer’s recommendations.
Ensure
that the reflector face is clean and free of dust, dirt, adhesive, or any
foreign material after installation.
Except
if mounted on a guardrail blockout, rotate the
reflective face of one-way reflectors upward from the vertical (or plumb)
position 2 to 3 degrees to facilitate “rain washing” of the reflector face.
When replacing reflectors on a concrete
surface, locate the new reflector approximately 3 inches (75 mm) horizontally
in either direction from the old location.
If
specified, use bi-directional reflectors (white/white) on the outside of curves
on two-lane highways.
Use
barrier reflectors that are the same color as the adjacent edge line.
The
Department will classify the reflectors as follows:
Mounting Location |
One-Way |
Bi-Directional |
Guardrail |
Type A |
Type A2 |
Concrete barrier, retaining walls, or bridge parapets |
Type B |
Type B2 |
626.05 Method of Measurement. The
Department will measure Barrier Reflector by the number of each in place, completed
and accepted.
If
a bi-directional reflector consists of two one-way reflectors mounted
back-to-back, the Department will measure it as one bi-directional reflector.
626.06 Basis of Payment. The
Department will pay for accepted quantities at the contract prices as follows:
Item
Unit
Description
626
Each
Barrier Reflector