HomeMy WebLinkAboutEngineer Report Englar Bridge Abutment ErosionMOSBY AND ASSOCIATES, INC.
CONSULTING ENGINEERS
1995 39TH AVENUE, SUITE D
P.O. BOX 6368
VERO BEACH, FLORIDA 32961
305-569-0035
February 17, 1988
Mr. Jerry Thomas
City of Sebastian
Post Office Box 127
Sebastian, Florida 32978-0127
Subject: Englar Road Bridge
Sebastian, Florida
Engineer's Project No. 87-147
Dear Mr. Thomas:
As requested, we have performed an inspection of the above subject
project. The bridge is located about 50 yards east of the Englar
Road, George Street intersection. Our inspection was limited:to--
the east abutment and concentrated on erosion under the approach slab.
The abutment appears to be constructed of precast concrete panels
cantilevered from the ground and supporting the approach slab.
Vertical joints in the panels are behind the bridge support piles.
Evidence under the bridge suggest that water is washing through the
center joint of the abutment and is eroding the soil from beneath
the approach slab and from behind the abutment.
According to you and your employees, a similar erosion problem has
occured before. The erosion was severe enough to create a large
"cavern" beneath the approach slab. At that time, the "solution"
was to fill the void with approximately 20 yards of concrete. How-
ever, since the joints between the abutment slabs were not sealed,
the erosion has continued.
We believe that the best solution is to pressure grout the soil be-
neath the approach slab, the effect of which will be two -fold. First,
the voids left by the effects of erosion will be filled, and second,
the joints between the abutment panels will be filled and prevent
further erosion. The grouting should be done as near the joints
as possible to ensure they get sealed.
Should you require further information, please call.
Ver t ul Pb
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R ndy L. Moy, .E.
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