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2010 Volume 1 Issue 2
 
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Hoover Dam Bypass Bridge Back On ScheduleAnimation ofr approach alignment for Hoover dam Bridge

USA
Hoover Dam Bypass Bridge Back On Schedule

Artists impression of completed projectRapid progress is now underway on the Hoover Dam Bypass Bridge in the USA. Works were halted for almost 2 years, following a non-fatal collapse of the of a metal-brace tower supporting on end of the high wire resulting in the rigging collapsing.

However, the work is back on track to be open on the revised schedule in November 2010. (The bridge has now been named the Mike O'Callaghan-Pat Tillman Memorial Bridge)

 

Given the harsh conditions in under which the $114 million bridge is being constructed it is testimony to the increasing health and safety practices now implement by the majority of contractors that accidents, fatalities and injuries are as low as they are on such project.

Obayashi/PSM JV, a joint venture of Obayashi Corporation and PSM Construction USA, Inc., the general contractor, began construction of the long open spandrel deck arch bridge in early 2005.

Apart from the major challenges including the building of the two dual-lane highway approaches from the Nevada and Arizona approaches, the long distance materials had to be transport, the quantities involved are significant.The 579 m (1,900 ft) long bridge standing 274 m (900 ft) above the Colorado River is extremely difficult to access as there are sheer cliffs either side.

The area is also prone to wind gusts and severe lightening storms, which can halt work as it is reliant on the high-wire pulley system.

During the summer, temperatures can reach up to 50° C (148° F) and in the winter fall to below freezing. So extreme is the heat that liquid nitrogen had to be used to control the temperature of the concrete to eliminate cracking while curing.

The bridge is a replacement for the current two-lane highway across the dam, U.S. 93, which can no longer adequately handle the 14,000 vehicles and trucks crossing per day, double the volume of 15 years ago on this vital infrastructure link.

Apart from the major challenges including the building of the two dual-lane highway approaches from the Nevada and Arizona approaches, the long distance materials had to be transport, the quantities involved are significant.

• 38,600 m³ (50,500 yd³) structural excavations

• 1,900 m³ (2,500 yd³) structural backfill

• Over 6,000 m (20,000 ft) rock anchors

• 21,800 m³ (28,500 yd³) concrete

• 3,280 tonnes (3,617 tons) of reinforcing steel

• 35,250 m² (380,500 ft²) concrete surface area

• 2,320 tonnes (5,116,000 lbs) structural steel

[cont]

 
 

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