桥梁工程PPT(姚林森第二版)第2篇第2章

1、第二篇 钢筋混凝土和预应力混凝土简支梁桥 第2章 桥面构造 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 本章内容 1.1 桥面铺装 1.2 桥面排水设施 1.3 桥面伸缩缝 1.4 人行道、栏杆与灯柱 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 1.1 桥面铺装 桥面铺装的作用 （1）保护行车道板 （2）防止雨水侵入结

2、构构件 （3）分散车辆轮重的集中荷载 对桥面铺装的要求： （1）行车舒适 （2）抗车辙 （3）抗滑 （4）刚度好 （5）不透水 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 知识点：桥面铺装，开始讲解这个知识点 1.1 桥面铺装 桥面铺装的类型 （1）普通水泥混凝土或沥青混凝土铺装 （2）防水混凝土铺装 （3）具有贴式防水层的普通水泥混凝土 或沥青混凝土铺装 现在趋向于采用高性能沥青混凝土铺装。 Dept of Road & Bridge Engineeri

3、ng, School of Transportation, Wuhan University of Technology 1.1 桥面铺装 桥面横坡的设置 （1）构造找坡 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology （2）结构找坡 1.1 桥面铺装 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 知识点：桥面铺装，讲解结束

4、 本章内容 1.1 桥面铺装 1.2 桥面排水设施 1.3 桥面伸缩缝 1.4 人行道、栏杆与灯柱 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 1.2 桥面排水设施 n 为防止雨水长时间滞留桥面，侵蚀结构构件，降低桥梁的耐久性，应 将雨水尽快排出桥外。 n 参考公路排水设计规

5、范（JTJ018-97） n 7.1.3. 桥面应有足够的横向和纵向坡度，使落在桥面上的降水迅速 排向桥面行车道两侧。桥面横坡可按路面横坡取用或比后者大0.5% 。 n 7.1.4. 泄水口宜设置在桥面行车道边缘处。泄水口的间距可依据设 计径流量按本规范8.2节所述的方法计算确定，但最大间距不宜超过 20m。桥梁伸缩缝的上游方向应增设泄水口，在凹形竖曲线的最低点 及前后35m处也应各设置一个泄水口。 n 7.1.5. 泄水口可采用圆形或矩形。圆形泄水口的直径宜为15cm 20cm；矩形泄水口宜为（2030cm)x(3040cm)。 Dept of Road & Bridge Engineeri

6、ng, School of Transportation, Wuhan University of Technology 知识点：桥面排水设施，开始讲解这个知识点 1.2 桥面排水设施 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 人行道下泄水管布置图示 1.2 桥面排水设施 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology

7、泄水管构造图 1.2 桥面排水设施 横向排水管道构造 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 知识点：桥面排水设施，讲解结束 本章内容 1.1 桥面铺装 1.2 桥面排水设施 1.3 桥面伸缩缝 1.4 人行道、栏杆与灯柱 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology Dept of Road & Bridge En

8、gineering, School of Transportation, Wuhan University of Technology 1.3 桥面伸缩缝 为保证桥跨结构在气温变化、活载作用、混凝土收缩与徐变等影响 因素下按受力图式自由变形，需要在适当位置设置伸缩缝。 固定支座处滑动支座处 伸缩缝 简支梁 A 简支梁 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 伸缩缝 伸缩缝的定义 知识点：桥面伸缩缝，开始讲解这个知识点 桥面伸缩缝类型 （1）镀锌铁皮伸缩

9、缝 1.3 桥面伸缩缝 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology （2）跨搭钢板式伸缩缝 1.3 桥面伸缩缝 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology （3）橡胶伸缩缝 1.3 桥面伸缩缝 Dept of Road & Bridge Engineering, School of Transportation, Wu

10、han University of Technology （4）其它形式伸缩缝 1.3 桥面伸缩缝 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 桥面伸缩缝的布置 （1）伸缩缝受各种因素作用， 很容易损坏，图示为孝感八一大 桥伸缩缝受损情况。 （2）为了减少伸缩缝的维护工 作量， 现在倾向于尽量减少伸 缩缝的数量。如在简支梁桥中采 用桥面连续或先简支后连续的做 法。 1.3 桥面伸缩缝 Dept of Road & Bridge Engineering, S

11、chool of Transportation, Wuhan University of Technology 桥桥 面面 连连 续续 的的 做做 法法 伸缩缝 伸缩缝 简支梁 桥面连续 1.3 桥面伸缩缝 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 先简支连续的做法先简支连续的做法 伸缩缝 临时支座 简支梁 1.3 桥面伸缩缝 Dept of Road & Bridge Engineering, School of Transportation, Wuh

12、an University of Technology 先简支连续的做法先简支连续的做法 伸缩缝 现浇接缝 连续梁 永久支座 1.3 桥面伸缩缝 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 知识点：桥面伸缩缝，讲解结束 本章内容 1.1 桥面铺装 1.2 桥面排水设施 1.3 桥面伸缩缝 1.4 人行道、栏杆与灯柱 Dept of Road & Bridge Engineering, School of Transportation, Wuhan Univ

13、ersity of Technology Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 1.4 人行道、栏杆与灯柱 一般人行道构造图 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 知识点：人行道、栏杆与灯柱，开始讲解这个知识点 1.4 人行道、栏杆与灯柱 装配式人行道构造图 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 1.4 人行道、栏杆与灯柱 具有高路缘的人行道构造图 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of Technology 1.4 人行道、栏杆与灯柱 栏杆图示 Dept of Road & Bridge Engineering, School of Transportation, Wuhan University of T