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The Walnut Lane Memorial Bridge is a prestressed concrete girder bridge in Philadelphia, Pennsylvania, designed by Belgian Engineer Gustave Magnel and built by the City of Philadelphia. Completed and fully opened to traffic in 1951, this three-span bridge carries Walnut Lane over Lincoln Drive and Monoshone Creek. It was the first major prestressed concrete beam bridge designed and built in the United States when completed. The form of the bridge is simple and appears to be like many highway bridges carrying traffic on US highways. The bridge deck is supported by thirteen concrete girders, each spanning . These girders were prestressed by post-tensioning four wire cables embedded in the concrete. Although this type of construction had been used in Europe for quite some time, the Walnut Lane Memorial Bridge was innovative in the United States and led to the successful application of this technology in this country. The material-saving bridge cost about $700,000 to construct, about 30 percent cheaper than a regular concrete arch design. A bronze plaque on the bridge's abutment reads: A second plaque reads: "Outstanding Civil Engineering Achievement / Designated May 1978" ==See also== *List of bridges documented by the Historic American Engineering Record in Pennsylvania 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「Walnut Lane Memorial Bridge」の詳細全文を読む スポンサード リンク
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