Lebanon, NH Case Study
Temporary Multi-Span Panel Bridge
The Acrow 700XS multi-span panel bridge owned by the New Hampshire DOT, provides a temporary crossing over the Connecticut River on US Route 4 eliminating a long detour while a new bridge is designed and constructed to replace the deteriorating historic bridge built in 1936.
- Acrow supplied 450 linear feet (137.2M) of bridging that was comprised of three spans. The span arrangement was 170 feet (51.8M) -170 feet (51.8M) and 110 feet (33.5M).
- The Acrow bridge has a 24 foot (9.3M) clear travel way between the guide rails.
- A test level 4 guide rail system was supplied by Acrow for the bridge
- Contract documents required a crowned asphalt overlay
- The bridge was supplied with a 5 foot (1.5M) wide sidewalk cantilevered off of one side of the bride.
- Full cantilevered launch
- The bridge was designed in accordance with AASHTO LRFD bridge design specifications second edition to:
- HL93 vehicular
- Pedestrian live load = 85psf
- 10 K snow plow vehicles on footwalk
- Utility load = 50plf
- (A) Panel chords, diagonals 7 verticals, panel reinforcing chords, Rakers to AASHTO M223 GD 65
- (B) Decking, raker brace, transom, top chord brace, swaybrace, transom brace, diagonal chord brace to AASHTO GD 50
- (C) Panel pins to ASTM A 193 GD b7
- (D) Bolts to AASHTO M164M – A325
- All major components galvanized to AASHTO M111 – ASTM A 123
- All bolts are hot dipped galvanized
- All pins are electro galvanized