论文部分内容阅读
双悬臂桁架拱桥在我省农水配套工程中开始推广,它的主要优点是:1.利用双悬臂代替工程量大、造价高的桥台。据大丰县统计,比轻桥台节省工程量40%,比桁架拱重力扶垛式桥台节省工程量70%,比双曲拱扶垛式桥台节省80%。2.减小中跨推力。比同跨度桁架拱桥减小推力35～60%,可基本解决软土地基上拱桥推力大,拱脚、拱顶易开裂的缺点。3.缩短了桁架拱中间跨度,并采用稍大矢跨比,既利于通航,又节省了工程量。据统计与同宽度渠道上的桁架拱桥比较,可节省工程量21～40%。4.实现全装配施工。双悬臂桁架拱桥可全部预制,只需设置四个台基即可装配而成,既加快了施工进度,又保证了施工质量。5.对规划疏浚加宽或未定型的河道,便于拆装扩建。结构上,双悬臂桁架拱端为简支,中跨部分可以是三铰、二铰、无铰,在外部为多次超
Double cantilevered truss arch bridge in our province supporting water and water projects started to promote its main advantages are: 1. The use of double cantilevers instead of engineering large, costly abutment. According to the statistics of Dafeng County, the project volume is 40% less than that of light bridge, which saves 70% of the project volume compared with the gravity abutment of truss arch and saves 80% than that of arch bridge. 2. Reduce the mid-span thrust. Compared with the span truss arch bridge to reduce the thrust of 35 to 60%, can basically solve the soft soil foundation on the arch thrust, arch legs, arch cracking the shortcomings. 3. Shorten the truss arch span, and the use of a slightly larger than the span, both conducive to navigation, but also save the amount of engineering. According to statistics and truss arch bridge with the same width of the channel, can save 21 to 40% of the project. 4. To achieve full assembly construction. Double cantilevered truss arch bridge can be prefabricated, just set up four base can be assembled, both to speed up the construction progress, but also to ensure the construction quality. 5. Planning dredging broadened or undefined river, easy disassembly expansion. Structurally, the double-cantilever truss arch ends are simply supported, the midspan part can be three hinges, two hinges, no hinge,