LOUISIANA’S MOVABLE BRIDGES
C. HANCHEY
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JARRETT LAMBERT, P.E.
DOTD
LOUISIANA’S MOVABLE BRIDGES
38 34
0 2 8
1 2 7 9
0
10
20
30
40
02 03 04 05 07 08 58 61 62
DOTD DISTRICT
MOVABLE BRIDGES BY DISTRICT
04
58
05
08
61
03
07
62
02
LOUISIANA’S MOVABLE BRIDGES
7
37
[VALUE]
8
0
10
20
30
40
50
60
BASCULE VERT. LIFT SWING PONTOON
MOVABLE BRIDGE TYPES
LOUISIANA’S MOVABLE BRIDGES
BASCULE
CHARACTERISTICS:
SINGLE OR DOUBLE LEAF
PIVOTS ON TRUNNIONS
COUNTERWEIGHT ABOVE OR
BELOW ROADWAY
UNLIMITED VERTICAL CLEARANCE
LOUISIANA’S MOVABLE BRIDGES
VERTICAL LIFT
PATRICK FELLER
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IRMA HALE
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C. HANCHEY
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CHARACTERISTICS:
MOVABLE SPAN SUSPENDED
FROM TOWERS
LIMITED VERTICAL CLEARANCE
SPAN BALANCE CRITICAL FOR
LOUISIANA’S MOVABLE BRIDGES
VERTICAL LIFT C. HANCHEY
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C. HANCHEY
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union/
CLIFF DARBY
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LOUISIANA’S MOVABLE BRIDGES
SWING
JARED MIXSON
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C. HANCHEY
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CHARACTERISTICS:
MOVABLE SPAN ROTATES ABOUT
CENTER PIER
BALANCE IS CRITICAL
EQUAL ARM OR BOBTAIL
UNLIMITED VERTICAL CLEARANCE
LOUISIANA’S MOVABLE BRIDGES
SWING
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C. HANCHEY
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LOUISIANA’S MOVABLE BRIDGES
PONTOON
WWW.NOLA.COM
CHARACTERISTICS:
FLOATING BARGE ROTATES ABOUT
PIVOT POINT ADJACENT TO
APPROACH
APRONS RAISE & LOWER WITH
WATER LEVEL
UNLIMITED VERTICAL CLEARANCE
C. HANCHEY
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LOUISIANA’S MOVABLE BRIDGES
9
7
5
12
15
26
8
14
5
0
5
10
15
20
25
30
0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90
QU
AN
TIT
Y
YEARS
AGES OF MOVABLE BRIDGES