桥梁毕业设计--大桥设计方案

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1、 毕业设计说明书 承德市*大桥设计A方案 (净9+21.0m人行道) 摘 要 本设计桥梁位于承德市区作为连接双塔山镇和滦河镇的重要桥梁， 在设计之初就 将设计的依据重点放在安全性和施工工序简单性上， 以便能更好更快的投入桥梁运营 阶段。在设计过程中，桥面由5片简支T梁组成，单孔标准跨径30m，为防止地震力作 用下出现落梁等地震灾害，故在确定桥梁计算跨径时取至28.66m。主梁采用现今较为 成熟的预应力技术来增大简支梁桥的跨径， 减少桥梁下部结构的工程量和避免了桥下 较大的阻水面积。下部结构设计时根据实际勘测地质情况基础选用钻孔灌注端承桩， 保证桥梁沉降量小也符合安全性的要求。由于桥位地处低烈度

2、区，本设计无需进行抗 震设计和验算，所以在布置抗震设防结构要求下，在盖梁上设置了抗震挡块。整个桥 梁的设计最大限度的实现了安全性和经济性的统一。 关键词：简支T梁桥；预应力；公路II级；钻孔灌注桩. ABSTRACT This design Bridges is located in Chengde city as an important bridge connected Shuangta town and Luanhe town, in the beginning of design will basis emphasis on safety and construction proces

3、s simple, so as to better and faster on the bridge operation stage into faster. In the design process, the bridge simply supported by the five T beam composed of standard single-hole span 30m, to prevent earthquake forces appear fall beam and other earthquake disaster, so in determining the large-sp

4、an bridge calculation 28.66 m to take. By now the girder mature prestressed technology to increase the span, reduce beam bridge the quantity and structure of the bridge avoided bridges larger block water area. When the structure design according to actual surveying geology condition choose the bored

5、 perfusion pile foundation, guarantee the bridge pile settlement is small also accord with the requirement of security. Due to the low intensity area located, this design without aseismatic design and checking, so in decorate aseismatic fortify structure request, in capping beam was installed on seismic block pieces. The whole bridge design realize the maximum security and economic unity. Key words：simply-supported T girder bridge；prestressing force；highway - level II ；cast-in-place pile. 目 录 第 1 章 水文计算 1 1.1 水文设计资料1 1.2 设计洪水流量计算1 1.3 设计水位计算2 1.4 一般水位计算4 1.5 桥孔最小净长计算4 1.6 桥面标高计算5 1.7 一般冲刷计算