基于极限强度理论的山区桥梁集中排水计算简化  

Simplification of Concentrated Drainage Calculation of Mountain Bridges based on Ultimate Strength Theory

作　　者：贺伟伟[1] 王桢[1] 罗波[1] 徐百成[1] 王良成[1] HE Wei-wei;WANG Zhen;LUO Bo;XU Bai-cheng;WANG Liang-cheng(CCCC First Highway Consultants Co.Ltd.,Xi'an 710075,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,西安市710075

出　　处：《公路》2023年第7期148-154,共7页Highway

基　　金：中交第一公路勘察设计研究院有限公司科技创新基金项目,项目编号KCJJ2021-06。

摘　　要：针对桥梁设计中往往依据工程经验判断集中排水管径与长度的问题,基于水文学、水力学基本原理和管道极限强度理论,推导了末端收集管段设计流量的简化计算公式,研究了末端收集管段设计流量控制因素影响的强弱关系,提出了桥梁结构参数与纵向排水管长度的简化表格。研究结果表明:在末端收集管段设计流量控制因素中,排水管径的影响最大,纵坡次之,桥宽较小,横坡基本无影响;当桥宽L_(p)≤10 m时,推荐排水管径为200 mm,长度为120 m≤L_(i)≤260 m;当桥宽10 m<L_(p)≤15 m时,推荐排水管径为250 mm,长度为160 m≤L_(i)≤260 m;当桥宽15 m<L_(p)≤20 m时,推荐排水管径为300 mm,长度为190 m≤L_(i)≤320 m;桥梁结构参数与集中排水管长度简化表格和规范公式两者的计算结果误差较小,可以直接应用于工程设计,避免大量的重复工作。In view of the problem that the diameter and length of centralized drainage pipe are often judged according to engineering experience in bridge design,based on the basic principles of hydrology and hydraulics and the theory of pipe ultimate strength,a simplified calculation formula for the design flow of the end collection pipe section is derived,the strength and weakness relationship of the influence of the design flow control factors of the end collection pipe section is studied,and a simplified table of bridge structure parameters and the length of the longitudinal drainage pipe is proposed.The results show that:among the design flow control factors of the end collecting pipe section,the diameter of the drainage pipe has the greatest influence,the longitudinal slope takes the second place,the bridge width is small,and the transverse slope has little influence;When the bridge width L_(p)≤10 m,the recommended drainage pipe diameter is 200 mm,and the length is 120 m≤L_(i)≤260 m;When the bridge width is 10 mL_(p)≤15 m,the recommended drainage pipe diameter is 250 mm and the length is 160 mLi260 m;When the bridge width is 15 mL_(p)≤20 m,the recommended drainage pipe diameter is 300 mm and the length is 190 m≤L_(i)≤320 m;The error between the calculation results of bridge structure parameters and the simplified table and standard formula of the length of centralized drainage pipe is small,which can be directly applied to engineering design and avoid a lot of repeated work.

关 键 词：桥面径流收集系统 极限强度理论 桥梁结构参数 排水管长度 管径 

分 类 号：U442.3[建筑科学—桥梁与隧道工程] U443.5[交通运输工程—道路与铁道工程]