New Hoover Dam BridgeNew Hoover Dam BridgeBetween Nevada and Arizona Between Nevada and Arizona

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Hoover Dam

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Hoover DamCalifornia

Nevada

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Hoover DamHoover Dam Bridge

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Hoover Dam Bridge

Hoover Dam

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Nevada

ArizonaState lineTime zone line

New method to build a reinforced concrete bridge without the

conventional temporary shoring

The suspension cables for temporary support

suspension cable

Reusable metal sliding formwork

High line cable conveyor

Suspension cables temporary support

System

The concrete Arch designed for carrying the temporary and permanent load

Conventional scaffold system, too expensive ! !

Reinforced concrete twin Arch connected by steel struts

Steel strut

Steel Box Girders and concrete roadway deck

Colorado River

Lower twin arch was completed

Cut off the suspension cables, when concrete

up to it’s strength

Reusable metal sliding formwork

for reinforced concrete columns

The upper deck columns, build

on the top of the lower twin arch

Steel Box Girders

Pre-stressed concrete and steel box

composite Girders

Hoover Dam Bridge over Colorado River

Hoover Dam Bypass BridgeOpened Oct. 19, 2010

The center line of Colorado River and Hoover Dam Bridge was State Line of Nevada and Arizona, and also a Time Zone divided line of Pacific and Mountain Time, If drive from west to the east, when you pass the bridge, you will enter Arizona and gain one extra hour. Click

Name of the Bridge• In the beginning called : Hoover Dam Bypass Bridge

now the official name was :

• Mike O’Callaghan – Tillman Killey Memorial Bridge

Mike O'Callaghan – Joined the Marines at sixteen, 1952 he lost part of his left leg in the battle of Korean War, 1971 to 1979 was Governor of Nevada, later he was the Executive Editor at the Las Vegas Sun newspaper, he died on March 5, 2004.

• Tillman Killey – Arizona famous NFL football player, he gave up his well paid job and joined the army, he died by a friendly fire in Afghanistan on April 22, 2004.

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Hoover Dam Bridge technical information Designer : T. Y. Lin International ( 林同棪 ) 1988 finished the investigation and environmental report. The design work start in July 2001 & finish two years later. • Bridge length : 1900 ft ( 580 m ).• Arch span : 1060 ft ( 320 m ).• Bridge width : Four lane highway. • Bridge height : 840 ft ( 263 m ) , 2nd height of U.S.• Bridge away from Hoover Dam : 1600 ft ( 550 m). • Construction began on Feb. 2005 and completion on Oct.2010.• Construction cost : 114 million.• This is the first Concrete-and-steel composite arch bridge built in

United State. • Pedestrian access is provided over the bridge for tourists.

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Hoover Dam technical information • Hoover Dam was built after 1930 Great Depression, it was a

project to increased job for American worker.• Type : Concrete gravity - arch dam • Top width : 45 ft ( 14 m), Base width : 660 ft ( 200 m)• Dam height : 726 ft ( 230 m), and 1245 ft (380 m) long• Construction begin at 1931 and finish at 1936 • Total cost : 49 million• Reservoir : 28,537,000 Acre ft (35,200 Kilo cubic meter)• Power annual generation : 4.2 Billion kwh • Worker : Hired 5500 construction workers, Chinese labor was

forbidden by construction contract. • Hoover Dam was a tour spot, every year more than million of

peoples visit there. Click

林同棪小傳 (T. Y. Lin) : Nov. 14, 1912 – Nov. 15, 2003 • 林同棪福建省福州人 ,1931 畢業於交通大學分校 , 唐山工學院土木系 , 1933 獲得美國加州大學 University of

California, Berkeley 土木碩士學位 .• 回國後任成榆鉄路 , 橋樑組總工程師 , 後任職於台糖鉄路處處長 .• 1946 回 UC Berkeley 土木系任教授 , 1976 年退休 .• 1954 在美創立 T.Y. Lin International, 工程顧問公司 . 主要承接預應力橋樑和大跨度建築等結構計算及設計為主 . • 林同棪對預應力工程 (Pre-stressed and Post-

tensioning Concrete) 有精深的研究 , 他把理論應用到實際的工程上 , 是世界知名的工程專家 , 因而有 ”預應力之父” 之稱 .

• 在 1970 年代 , 先後在台湾 , 香港和中國大陸都設立分公司 .• 1972 被選為中央研究院 , 院士 .• 1986 獲得美國雷根總統之 National medal of Science. • 1996 被選為中國科學院 , 外籍院士

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