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Re: Bridge Abutment Replacement

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Is your intent to maintain the existing superstructure?  If not, phased
construction of bridges is very common.  Even if you are trying to keep the
existing superstructure, you may want to investigate replacing the end
spans.  The idea would be to maintain traffic on one side of the bridge
while you remove and reconstruct the abutment and approximately half of the
end span.  You then repeat the process for the other side.

M. David Finley, P.E.
Lake City, FL

----- Original Message -----
From: "Steven Mallett" <smallett(--nospam--at)dillon.ca>
To: <seaint(--nospam--at)seaint.org>
Sent: Thursday, June 14, 2001 8:49 AM
Subject: Bridge Abutment Replacement


> We are looking at designing to replace an existing bridge abutment. The
> existing concrete abutment is 30 years old and is supported on steel pipe
> piles founded on bedrock (well, some of them anyway which has
> precipitated the replacement) with H-pile batter piles. There has been
> gradual settlement over the years and repairs to suit. Settlement also due
> to embankment fill consolidation and resulting downdrag on piles.
> Geotechnical investigation will determine if consolidation is near
> completion.
>
> Bridge is three span with pre-stressed concrete girders (8) and
> concrete deck. Middle span over a railway line. End spans (45 ft.) are
> over embankment slope. Overall width is 62 feet with two travel lanes.
> The kicker here is that one lane must remain open to traffic at all times
> during the construction. No detour routes are available.
>
> I am seeking comments for:
>
> 1. Suggestions/past experiences for temporary support of the girders
> during  construction of the new abutment.
>
> 2. Suggestions/past experiences in building abutment in separate pieces,
> i.e. demolish one half, then re-build half and re-seat girders for traffic
> lane, then demolish and re-build other half. We also have to worry about
> avoiding the existing piles when driving new piles.
>
> Thanks in advance,
>
> Steven A. Mallett, P.Eng.
> Dillon Consulting Ltd.
>
>
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