HomeMy WebLinkAboutItem 05.d.;.
Ipava Avenue Mill and Overlay
LAKEVILLE PUBLIC WORKS
Christopher Petree, Director
August 2012
A mill and overlay consists
of milling off an inch or two
of the asphalt roadway
surface and replacing it
with the same amount of
new asphalt. The purpose
is to create a new road
surface in place of one that
was plagued by surface
failures. Typically, collector
roadways in the City receive
periodic mill and overlay
refurbishment due to
the level of traffic and
slightly higher speeds.
The segment of Ipava
Avenue between
Kenwood Trail and
202n Street was the last
in a series of collector
overlay undertaken by
the Engineering
Division this summer.
Collector overlays are
managed through the
City's pavement
management program
and are evaluated on the same pavement rating system as other streets
Lakeville. However, collector roadways, due to their importance to the
in
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transportation infrastructure, are held to a higher standard for maintenance and
repair. During this project, contractors milled and replaced approximately 2- inches
of asphalt and replaced areas of structurally deficient curb and gutter.
❖ Manhole Raising
Both weather and traffic
take their toll on City streets.
The movement of the
pavement can, over time,
result in manholes and
valves settling below the
level of the road surface.
This was the case along
Kenwood Trail north of 1 -35
where several manholes had
settled, causing a
depression in the road
surface. Staff from the
Utilities Division spent
several days removing
asphalt from around
the manholes and
bringing them up to
grade. The first step in
the process was to cut
out and remove the
asphalt and dirt
around the manhole
and rings to get down
to the manhole
structure itself. The
manhole structure
provides a firm base on which new components can be placed to raise the
manhole. For this project, staff used a combination of cement and plastic rings to
restore the manhole level with the roadway. A contractor followed immediately
behind City staff to repave the area around the manhole and return Kenwood Trail
to full use.
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+ Sign Installation
Among the list of things to
do associated with the
street reconstruction
project in Valley Park is the
updating of signs to the
current standards. As part
of the project, the Streets
Division installs the new
signs once the area behind
the curb is restored. The
City uses Telespar, a square,
telescoping tubing system
in place of the older round
post and U- channel post
that are common for most
sign applications. Telespar provides for flexibility and ease of sign installation and
makes repairs easier for signs that have been knocked down. Staff replaces all of
the signs on each post with the new diamond grade sheeting that has greater
retroreflectivity and a longer service life over the previously used engineer grade
sheeting. Receivers are directly embedded in the boulevard and the finished sign
post is inserted to the proper depth and locked in place.
❖ Asphalt Patching
An important aspect of
maintaining the
transportation
infrastructure is keeping the
road surface viable. There
are a variety of methods
available to seal and
preserve the asphalt surface
against environmental
oxidation and subsequent
weakening. However, when
the surface fails, the
alternatives narrow
dramatically and
correspondingly increase in cost. One of the first methods used by the Streets
Division is to lay a patch over the failed surface. With the new asphalt patch truck,
this is a much safer and more efficient process. Previous methods placed hot mix
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in the bed of a small dump truck and the staff poured and shoveled it from the bed
as quickly as possible before it cooled. The new truck holds more asphalt and that
means less time is lost as the truck makes replenishment runs to the asphalt plant.
It also keeps the mix at a constant temperature which makes it easier to apply.
With the proper adhesion and smoothing provided by a vibratory roller, a surface
patch will last for several years.
• Transportation Safety Improvements
Several improvements to
pedestrian safety have
occurred throughout the City
over the past few months.
One of the projects was a
traffic calming project along
Flagstaff Avenue between
County Road 46 and Dodd
Boulevard. This included the
restriping of Flagstaff Avenue
to make the traffic lanes
narrower and the installation
of solar powered driver
feedback signs that digitally
display a vehicle's current speed. The
narrower traffic lanes provide a visual
cue to reduce speeds and the driver
feedback signs reinforce the 30 MPH
speed limit. Another project was to
upgrade the new pedestrian crossing on
Ipava Avenue near Century Middle
School. The placement of the crosswalk
was based on pedestrian traffic patterns,
but its location and the speed limit
along that portion of Ipava required
additional measures to increase its
visibility to motorists. To increase
visibility of the crosswalk and call
attention to pedestrians using the
crosswalk, pushbutton activated solar
powered LED pedestrian crossing signs
were installed. The signs are wirelessly connected so all signs activate when one of
the crossing buttons is pushed. The final project was the completion of a Safe
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Routes to School project at
the intersection of Highview
Avenue and 175` Street.
Traffic volume through this
intersection and the high
level of pedestrian activity
due to the proximity of
Cherry View Elementary
School called for better
methods of increasing the
safety of those walking to
and from school each day.
Pushbutton activated red
lights were installed as part of
the project making the importance
of this intersection more visible to motorists
and emphasizing the requirement to stop for pedestrians in the crosswalk.
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