Greenville Bridge
Coordinates: 33 ° 17 ′ 14 " N , 91 ° 9 ′ 15" W.
| Greenville Bridge | ||
|---|---|---|
 Benjamin G. Humphreys Bridge (photo montage) |
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| use |
US Highway  
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| Crossing of | Mississippi River | |
| place | Washington County in Mississippi and Chicot County in Arkansas | |
| construction | Cable-stayed bridge | |
| overall length | 4194 m (including driveways) 783 m (main bridge) |
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| width | 31 m | |
| Longest span | 420 m | |
| Clear height | 20 m | |
| building-costs | $ 336 million | |
| start of building | 2001 | |
| opening | 2010 | |
| planner | HNTB Corporation | |
| location | ||
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The Greenville Bridge is a four-lane road bridge over the Mississippi River between Washington County in Mississippi and Chicot County in Arkansas , 20 km southwest of Greenville . It leads the US Highways 82 and 278 and in 2010 replaced the two-lane Benjamin G. Humphreys Bridge 850 m upstream . To improve the navigation conditions for the large push convoys on the Mississippi section, a cable-stayed bridge with a span of 420 m above the shipping channel was chosen; the 70-year-old truss bridge was demolished in 2011.
history
Until the Benjamin G. Humphreys Bridge was built , ferries were the only way to cross the Mississippi near Greenville . In the 1930s, then Mayor Milton C. Smith realized that a road bridge would be necessary for the further development of the city and sought government approval and funding, which was difficult during the Great Depression. With the support of the Works Progress Administration , construction work could begin at the end of 1938 and the bridge opened on October 4, 1940.
The bridge had four river piers and a maximum span of only 256 m. The flow section of the Mississippi before the bridge is characterized by a sharp bend, and at times predominant high flow rate , which makes the navigation and with the increase of the waterway and the size of the pushing units to more collisions of barges to the inner pillars led than any other bridge on the Mississippi. In addition, the narrow two - lane truss bridge no longer met traffic requirements over the years and became increasingly too small for the increasing volume of traffic on US Highway 82. In the early 1990s, the Mississippi Department of Transportation began preliminary investigations into the construction of a new bridge, and in 1995 the decision was made to build a four-lane cable-stayed bridge with only two river piers, around 850 m downstream.
The bridge was designed by the HNTB Corporation (Howard, Needles, Tammen & Bergendoff) , an engineering and architecture firm from Kansas City, Missouri , which also designed the Benjamin G. Humphreys Bridge (then Harrington, Howard & Ash ). In cooperation with the Waterways Experiment Station of the US Army Corps of Engineers , the location of the main bridge was analyzed in order to ensure optimal conditions for shipping traffic. The original design was then moved 30 meters to the west in order to adjust the main span of the shipping channel. The USD 336 million project was divided into three construction phases: The main bridge ( Massman Construction and Traylor Brothers ) and the access roads on the Arkansas side ( Austin Bridge & Road ) and the Mississippi side ( Hill Brothers Construction and Jensen Construction ) . The cable-stayed bridge was built in 2001–2006, followed by the girder bridges on the access roads in 2006–2010, and the old Benjamin G. Humphreys Bridge was demolished in 2011.
description
Main bridge
The main bridge, designed as a cable-stayed bridge, has a length of 783 m, with a span of 420 m between the H-pylons and 181.5 m to the outer pillars, to which the access roads are connected. The reinforced concrete pylons have a height of approx. 130 m above the surface of the water, were erected using caissons and anchored almost 40 m deep in the river bed; the outer pillars were built on piles . Due to the flow speed of the Mississippi of up to 3.4 m / s, special precautions had to be taken when erecting the pylons. For example, the US Army Corps of Engineers laid huge movable concrete mats in the river bed as scour protection to prevent erosion around the caissons. In addition, special breakwaters and guides made of steel pipes with a diameter of 1.5 m were built for the lowering process , which were driven 18 m into the river bed.
The 31 m wide track support was in cantilever assembled from prefabricated 15 m long steel segments, which are supported by a respective pair of cable-stayed. A total of 4 × 14 stay cables are mounted in a fan system on each side of the bridge, with the outer three running parallel at the end of the bridge. The steel girder is provided with a reinforced concrete top layer and offers space for two 3.6 m lanes in each direction of travel - with corresponding side strips.
Driveways
The access roads from a large number of girder bridges connect to the cable-stayed bridge. On the Arkansas side, they have a total length of 1,402 m, rest on 35 bridge piers including abutments and consist mainly of 36 m long reinforced concrete beams with integrated double-T section steel girders , each spanning four piers (three spans). A 279 m long T-beam bridge was integrated over the flood dam with a span of 110 m above the dam. On the Mississippi side, the reinforced concrete beams are 42 m long and the T-beam bridge over the flood dam is 253 m (span 100 m). The girder bridges rest here on a total of 50 bridge piers and have a total length of 1952 m up to the abutment .
See also
Web links
- The US 82 Greenville Bridge across the Mississippi River . Mississippi Department of Transportation.
Individual evidence
- ↑ The US 82 Greenville Bridge - History: The Quest for a Bridge. ( October 30, 2013 memento on the Internet Archive ) Mississippi Department of Transportation.
- ^ The US 82 Greenville Bridge - Project Summary: The 1940 Bridge. ( November 7, 2011 memento on the Internet Archive ) Mississippi Department of Transportation.
- ↑ Larry L. Daggett, Donald Wilson: Navigation Model Study Improves River Safety of New Bridge. In: TR News Magazine. No. 196, May-June 1998.
- ^ US 82 Greenville Bridge, Southeast Arkansas. Road Traffic Technology, Cable Intelligence. Retrieved November 4, 2017.
- ^ A b The US 82 Greenville Bridge - Project Plan and Elevation. ( Memento of May 24, 2012 on the Internet Archive ) Mississippi Department of Transportation.
- ↑ a b Greenville Bridge. Massman Construction Company. Retrieved November 5, 2017.
- ^ F. Keith Jacobson: Construction of the Main Tower Pier Caissons for the Greenville Bridge in Mississippi. Deep Foundations Institute, 2007.
- ^ The US 82 Greenville Bridge - Project Summary: The New Bridge. ( Memento from May 18, 2012 on the Internet Archive ) Mississippi Department of Transportation.