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The Commodore Schuyler F. Heim Bridge is a vertical-lift bridge in the Port of Los Angeles. Dedicated on January 10, 1948,〔"High Lift Bridge Dedicated at Terminal Island", ''Los Angeles Times'', January 11, 1948, p. 14.〕 the bridge allows State Route 47 (the Terminal Island Freeway) to cross over the Cerritos Channel. It is one of the largest vertical-lift bridges on the West Coast. At the time of its opening, it was the highest in the county. Its towers are tall above the roadway deck and about tall when measured from the water level at high water.〔 ==History== The deck of the bridge is an open grid to decrease weight and ease lifting of the bridge to allow ship traffic to pass underneath. The state of California took over operation of the bridge from the city of Los Angeles in 1964.〔 As of 1988, the bridge was being raised frequently, about 8,500 times per year.〔 SR 47 and the connecting State Route 103 are heavily used by trucks to bypass part of the crowded Interstate 710 freeway. Due to the large amount of heavy truck traffic over the bridge, the deck is subject to excessive wear. The deck was completely replaced in 1997 but was still under extreme distress. The California Department of Transportation (Caltrans) installed eight experimental fiber reinforced polymer (FRP) panels and attached sensors to test stress, load bearing, and temperature variations of the panels to determine their effectiveness as a permanent replacement.〔(【引用サイトリンク】 Schuyler Heim Bridge Deck Instrumentation )〕 Chicago-based engineering firm CTLGroup installed strain gages and thermocouples within the layers of the FRP. Each month, technicians perform a remote static load test of the bridge, providing direction to onsite Caltrans staff while monitoring real-time data from the firm's Chicago office. Construction is underway to replace the existing Schuyler Heim Bridge with a four-lane fixed-span bridge by 2016 in order to meet current safety and earthquake standards. Construction began in 1946.〔 The Chief Engineer for the project until October 1947 was H. E. Wilson.〔 The bridge is named in honor of Commodore Schuyler Franklin Heim, who was put in charge of the Naval Operating Base on Terminal Island in 1942.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Commodore Schuyler F. Heim Bridge」の詳細全文を読む スポンサード リンク
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