Replacing the Stay Cables on the Hale Boggs Memorial Bridge (I L li ...
Replacing the Stay Cables on the Hale Boggs Memorial Bridge (I L li ...
Replacing the Stay Cables on the Hale Boggs Memorial Bridge (I L li ...
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David Coulsey<br />
Kiewit Louisiana Co.<br />
<str<strong>on</strong>g>Replacing</str<strong>on</strong>g> <str<strong>on</strong>g>the</str<strong>on</strong>g> <str<strong>on</strong>g>Stay</str<strong>on</strong>g> <str<strong>on</strong>g>Cables</str<strong>on</strong>g> <strong>on</strong> <str<strong>on</strong>g>the</str<strong>on</strong>g><br />
<strong>Hale</strong> <strong>Boggs</strong> <strong>Memorial</strong> <strong>Bridge</strong><br />
(I (I‐310‐Lu<strong>li</strong>ng) L <strong>li</strong> )<br />
1
Lu<strong>li</strong>ng u g<strong>Bridge</strong> dge Project– oject By y <str<strong>on</strong>g>the</str<strong>on</strong>g> t eNumbers u be s<br />
Original C<strong>on</strong>structi<strong>on</strong> Completi<strong>on</strong> …. 1983<br />
Vehicles Vhil Crossing C i Per P Day D ….. 45,000<br />
Span Length…… 2,225 ft<br />
Pyl<strong>on</strong> Height Height……. 400 ft<br />
Number of <str<strong>on</strong>g>Stay</str<strong>on</strong>g> <str<strong>on</strong>g>Cables</str<strong>on</strong>g> to Replace…….. 72 ea<br />
3
Lu<strong>li</strong>ng u g<strong>Bridge</strong> dge Project oject ‐ Why y We’re e eHere ee<br />
Corrosi<strong>on</strong> of<br />
Existing <str<strong>on</strong>g>Cables</str<strong>on</strong>g><br />
All C<str<strong>on</strong>g>Cables</str<strong>on</strong>g> bl h have<br />
Damage<br />
39 of 72 rated<br />
Critical<br />
4
Existing Cable <str<strong>on</strong>g>Stay</str<strong>on</strong>g>s<br />
Parallel wire system<br />
Presc<strong>on</strong> anchorage<br />
111‐307 ¼” dia. 270ksi bare wire<br />
Individually “butt<strong>on</strong>‐headed”<br />
Grout filled stay pipe<br />
5
Deck Anchorage<br />
6
New Cable <str<strong>on</strong>g>Stay</str<strong>on</strong>g>s<br />
VSL SSI2000 Parallel Strand System<br />
Multiple corrosi<strong>on</strong> barriers<br />
- Individually greased and shea<str<strong>on</strong>g>the</str<strong>on</strong>g>d 0.62” strand<br />
- HDPE <str<strong>on</strong>g>Stay</str<strong>on</strong>g> pipe<br />
Stringent testing requirements<br />
Strand by strand replaceabi<strong>li</strong>ty<br />
7
Cable Operati<strong>on</strong>s Sequence<br />
Install Temporary <str<strong>on</strong>g>Stay</str<strong>on</strong>g> <str<strong>on</strong>g>Cables</str<strong>on</strong>g><br />
Lift‐Off, De‐Stress, & Remove Existing <str<strong>on</strong>g>Stay</str<strong>on</strong>g>s<br />
Modify Existing Structure @ Anchor Locati<strong>on</strong>s<br />
Install New Cable <str<strong>on</strong>g>Stay</str<strong>on</strong>g>s<br />
De‐Stress, Jump, & Re‐Install Temporary <str<strong>on</strong>g>Stay</str<strong>on</strong>g>s<br />
11
1 & 6 400 11,132 132<br />
1 & 5 280 1,025<br />
2 & 5 260 862<br />
3 & 4 260 610<br />
12
De‐Stress & Lower Existing g <str<strong>on</strong>g>Stay</str<strong>on</strong>g>s y<br />
Existing stay cables de‐stressed in a pair<br />
KLC required to find <str<strong>on</strong>g>the</str<strong>on</strong>g> force in <str<strong>on</strong>g>the</str<strong>on</strong>g> existing stay cables<br />
Four phases to <str<strong>on</strong>g>the</str<strong>on</strong>g> De‐Stress & Lower Operati<strong>on</strong>:<br />
1. Lift Off & De‐Stress <str<strong>on</strong>g>Stay</str<strong>on</strong>g><br />
2. Lower <str<strong>on</strong>g>Stay</str<strong>on</strong>g> from <str<strong>on</strong>g>the</str<strong>on</strong>g> Pyl<strong>on</strong><br />
33. Cut <str<strong>on</strong>g>Stay</str<strong>on</strong>g> Cable<br />
4. Load Cable for Scrap<br />
Backspan<br />
Mainspan<br />
16
Composite Photo of Deck Level Anchor with De-<br />
Tensi<strong>on</strong>ing Adapter Socket Installed<br />
17
Install New <str<strong>on</strong>g>Stay</str<strong>on</strong>g>s y<br />
Install New <str<strong>on</strong>g>Stay</str<strong>on</strong>g> Anchorages/Comp<strong>on</strong>ents<br />
Weld HDPE <str<strong>on</strong>g>Stay</str<strong>on</strong>g> Pipe<br />
Hoist Pipe<br />
Install & Stress Strand<br />
Install Dampers and close up<br />
20
New e <str<strong>on</strong>g>Stay</str<strong>on</strong>g> Comp<strong>on</strong>ents Co po e ts – Deck ec Level ee<br />
Anchor Chair Exit Pipe<br />
& Anchor<br />
21
New e <str<strong>on</strong>g>Stay</str<strong>on</strong>g> Comp<strong>on</strong>ents– Co po e ts Pyl<strong>on</strong> yo Level ee<br />
23
Installed Pyl<strong>on</strong> Anchor<br />
24
New <str<strong>on</strong>g>Stay</str<strong>on</strong>g> y Comp<strong>on</strong>ents p – HDPE Pipe p Weld<br />
Fuse/Weld pipes toge<str<strong>on</strong>g>the</str<strong>on</strong>g>r with Butt Fusi<strong>on</strong> Hydro‐<br />
Electric Machine<br />
25
New <str<strong>on</strong>g>Stay</str<strong>on</strong>g>‐ Pipe Hoist<br />
27
QUESTIONS ?<br />
31