HomeMy WebLinkAboutSN 3929 Narrative Jolly over Sycamore Creek 2017
BIENNIAL BRIDGE INSPECTION SUMMARY
JOLLY ROAD OVER SYCAMORE CREEK
STRUCTURE NUMBER – 3929
CITY OF LANSING, MI
October 12, 2017
Tetra Tech
401 South Washington Square, Suite 100, Lansing, MI 48933
Tel 517.316.3930 Fax 517.484.8140 www.tetratech.com
The structure is a two span steel bridge constructed in 1963 and
widened in 1993. The bridge was undergoing rehabilitation work at the
time of the inspection. The work consists of hydrodemolition and a
deep concrete overlay, expansion joint replacement, beam end repairs,
zone painting, substructure repair, placement of rip rap, and approach pavement replacement. The
bridge is in fair condition.
DECK
The new concrete overlay and expansion joints were in place and good condition, although the deck was
covered with burlap and plastic in the westbound lanes.
The deck underside has transverse cracks with efflorescence in the first two bays from each fascia.
There is a construction joint in the third bay from both the south and north and in the middle bay. The
construction joints have efflorescence and evidence of previous leaking. There were several plywood
forms in place for full depth repairs in the 2nd, 4th and 6th bay from the south in the west span and in
the 4th bay from the north in the east span. There was temporary false decking in place for much of the
north half of the bridge in the east span.
There are sidewalks on both sides of the bridge. The bridge sidewalks have hairline cracks throughout.
There is a spall on north curbline at the west end that had not yet been repaired. The bridge railings are
concrete open parapets with a one‐tube rail. The concrete railings have light map cracking throughout.
The openings in the parapet railing do not meet current AASHTO standards for pedestrian railings.
SUPERSTRUCTURE
Many of the beams have peeling paint or spotted rust on the bottom flanges and on the webs of the
fascia beams. There is some peeling paint and corrosion on the fascia beams at the abutments. There is
section loss visible but painted‐over on some of the beam ends at the pier, heaviest at the third beam
from each fascia. There is corrosion on most of the beam ends at the pier, with the heaviest at the north
fascia beam and the 3rd beam from the south. There is relative lateral north‐south displacement of the
beam webs at the pier for all of the beams except the north fascia. Several of the beam ends were
drilled for beam end repairs, but the repair plates were not yet in place.
All of the rocker bearings at the pier exhibit peeling paint and moderate corrosion. Most of the rocker
bearing are tilted inward except at the fascia beams. At the west abutment, the 3rd through 6th bearings
from the south have moderate to heavy corrosion. Many of the diaphragms over the pier also have
corrosion.
There is a 12‐inch water main in the third bay from the north. The pipe supports consist of steel
channels. The water main and all of the channels are corroded due to the leakage from the construction
joint. Many of the channels are visibly bent and sagging.
Tetra Tech
401 South Washington Square, Suite 100, Lansing, MI 48933
Tel 517.316.3930 Fax 517.484.8140 www.tetratech.com
There are six conduits suspended from the south fascia. The utility hangers are braced by steel cable
extending the length of the bridge. A tree has broken the cable at the west end. The bottom members
on the first two utility hangers adjacent to the west abutment are also broken but still functioning. There
are nine conduits suspended from the deck by utility hangers in the second bay from the south. One of
the conduits in the run was disconnected. In its place is a conduit that is not supported by the utility
hangers, but is hanging loose and is supported by 2x4 timbers resting on the beam bottom flanges over
the top of the pier.
SUBSTRUCTURES
The abutments and pier have been repaired by patching and epoxy injection of cracks. There are spalls in
the backwall adjacent to the center six beams at both abutments and at the conduit penetration at the
second bay from the south at the east abutment. There is a shallow spall on the top of the southeast
slopewall at the southernmost end. There was still some temporary scaffolding in place around the pier.
There is generally no scour protection (rip rap or slope paving) at the abutments. There is a 30” storm
sewer pipe penetration the north end of the east abutment below the slopewall. The prior scour hole
has been filled with rip rap up to the top of the footing. Rip rap has been placed around the pier.
There are trees growing adjacent to the bridge directly in front of the abutment slopewalls, although
many were removed as part of the construction work. There is brush growing up against the south fascia
and railing at the west span.
APPROACHES
There is new reinforced concrete pavement at both approaches. The eastbound lanes were complete at
the time of inspection and the westbound lanes were in the process of being poured. The approach
sidewalk on the north side was removed but had not yet been replaced. There is no approach sidewalk
on the south side.
RECOMMENDATIONS:
Retrofit concrete parapet railing to meet current AASHTO standards for clear openings.
Remove trees/brush adjacent to the bridge.
Coordinate with utility companies for repair of damaged conduit hangers.