John Greenleaf Whittier Bridge
Coordinates: 42 ° 50 ′ 6 " N , 70 ° 54 ′ 40" W.
| John Greenleaf Whittier Bridge | ||
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| Convicted |
 Interstate 95
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| Crossing of | Merrimack River | |
| place | Amesbury - Newburyport , Massachusetts | |
| construction | Network arch bridge | |
| overall length | 426.7 m | |
| width | 26 m + 21 m | |
| Longest span | 146.3 m | |
| start of building | 2013 | |
| completion | 2018 | |
| planner | HNTB | |
| location | ||
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John Greenleaf Whittier Bridge is the name of two parallel road bridges over the Merrimack River between Amesbury and Newburyport , Massachusetts , which cross Interstate 95 across the river.
They are named after the poet John Greenleaf Whittier (1807-1892), who was born in Haverhill, about 20 km upstream, and who lived in Amesbury for a long time.
description
The two 400 m (1310 ft ) long bridge structures each have four lanes with hard shoulders on both sides. There is also a footpath and bike path on the southern bridge, which connects various recreational areas in the area. The southern bridge is 26.2 m wider than the almost identical 21.3 m wide northern bridge. They stand at a distance of approx. 9 m from each other.
The river bridges are network arch bridges with spans of 146.3 m (480 ft). Their segmental arches have a construction height of 22.8 m (74.8 ft) and an arrow ratio of 1: 6.4. They are made of curved H-shaped steel beams that are consistently 1.28 m (4.2 ft) high and 1.22 m (4 ft) wide. The H-profile was chosen because it is easier to manufacture and assemble than a hollow profile and because the hangers can easily be attached to cross-sheets between the flanges .
The arches are stiffened by X-shaped wind bracing made from hollow boxes . Each arch has 34 hangers arranged at an angle, which usually cross twice.
The track support have steel girders at the edges, which receive the thrust of the sheets, as well as a grid of longitudinal and transverse beams of (9.5 to 24 cm in. ) Thick reinforced concrete - prefabricated panels being connected. The slabs are provided with a sprayed-on seal and a 3-inch (3-inch) asphalt surface course. To separate the pedestrian and cycle path were slide walls of EPS - concrete used on a steel mesh was installed.
history
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The bridge designed by HNTB was built between 2013 and 2018. When it was completed, it was one of the 15 network arch bridges built in the USA, 9 of which were planned by HTNB. What was unusual for a construction project in the USA was that, due to lack of time, construction began while the planning and coordination discussions between the client, the Massachusetts Department of Transportation , the planner and the construction companies were still ongoing. Initially, the plan was to assemble the two arch bridges on land and then swim in . However, as supports and cranes from a recently completed construction project were available, it was decided to install both bridges on site for reasons of cost.
The new bridge replaced the previous building of the same name with 2 × 3 lanes without emergency lanes, a steel truss bridge opened in 1952 with three arches that were constructed as continuous girders extending over three fields . It was dismantled after the southern bridge was completed in November 2015 and took over all traffic on provisionally set up 2 × 3 lanes. After the old bridge was dismantled, the new northern bridge was built in its place.
literature
- Gregor Wollmann, Lisa Brigg, Savas Kiriakidis, Chris Daigle: Tied Together. In: Civil Engineering , at asce.org/cemagazine
Web links
- John Greenleaf Whittier Memorial Bridge. Photo of the completed bridge, on HNTB.com
- Whittier Bridge. Album with 88 photos from the construction phase, MassDOT, on Flickr
- Photo from the construction phase on canambridges.com
Individual evidence
- ↑ The length of the bridge given in the sources as 1400 ft includes the other construction site with the abutments.
- ↑ a b No. 10 - Whittier Bridge on roadsbridges.com
- ↑ a b Gregor Wollmann, Lisa Brigg, Savas Kiriakidis, Chris Daigle: Tied Together. In: Civil Engineering , at asce.org/cemagazine
- ^ Brianna Fries: New Whittier Bridge Makes History on americaninfrastructuremag.com
- ↑ New Whittier Bridge Evokes Classic Design on MassDOT Blog