1、Segmental Concrete Bridges 97 1280 单词，单词，7000 英文字符英文字符,2150 汉字汉字 3.3 Construction Methods 3.3.1 Balanced Cantilever Construction Free cantilevering is a method of construction used to build outward from a ixed point to form a canti- lever structure, without temporary support, using staged constructi
2、on as shown in Figure 3.7. Deinition of “cantilever” from Websters Dictionary is: “A rigid structural member projecting from a vertical sup- port, especially one in which the projection is great in relation to the depth, so that the upper part is in tension and the lower part in compression.” Anothe
3、r meaning of “cantilever” is “bracket.” When two opposing free cantilever structures are attached as a single structure and erected at the same step, it is termed “balanced cantilever construction method” as shown in Figure 3.8. It is believed that the idea of cantilevering in bridge construction or
4、iginated in the ancient Orient. Shoguns Bridge located in Nikko, Japan, is the earliest recorded cantilever bridge, which dates to the fourth century. he Wandipore Bridge, shown in Figure 3.9, was constructed in the seventeenth century using timber cantilever members with the drop-in span girder in Bhutan, between India and Tibet (Petroski, Henry. 1995). Form traveler F i xed point FIGURE 3.7 Cantilevering construction method. Form traveler Form traveler C L Pier
