悬索桥主索鞍的关键铸造技术  

Key Casting Technology of Main Cable Saddle of Suspension Bridge

作　　者：甄玉杰 罗国龙 黄安明 ZHEN Yujie;LUO Guolong;HUANG Anming(China Construction Third Bureau Group Co.,Ltd.,Northwest Company,Xi'an 710065,China;Deyang Tengen Heavy Industry Co.,Ltd.,Deyang 618099,China)

机构地区：[1]中建三局集团有限公司西北公司,陕西西安710065 [2]德阳天元重工股份有限公司,四川德阳618099

出　　处：《铸造技术》2021年第10期861-865,共5页Foundry Technology

基　　金：中建三局集团有限公司科技研发课题(CSCEC3B-2019-7)。

摘　　要：西安市建材北路跨灞河桥为第十四届全运会重要交通通道,该桥主桥为主跨300 m钢塔钢箱梁空间自锚悬索桥。为了克服空间缆在塔顶处由主缆产生的水平分力对塔产生的附加应力,该桥主索鞍采用了一鞍双槽的设计理念。采用整体式索鞍,主索鞍设计两个对称鞍槽,增强了索鞍对水平分力的承载能力。该桥主索鞍的外形尺寸为7.5 m×5.6 m×4.8 m,边跨鞍体鞍体重量达到126 t,主跨鞍体重量为119 t。针对该桥主索鞍重量和体积大、造型复杂的特点,研究主索鞍鞍体铸造方案、铸造工艺流程、机加工和试装配等关键技术工艺,对铸造过程的难点、重点进行分析。通过采取相应的工艺控制措施,取得了优良的产品质量。该桥主索鞍加工铸造后,各项技术指标均满足设计和规范要求。In order to overcome the additional stress on the tower caused by the horizontal component force generated by the main cable at the top of the tower,the main cable saddle of the bridge is designed with one saddle and two slots.An integral saddle is adopted,and two symmetrical saddle slots were designed for the main saddle to enhance the carrying capacity of the saddle to the horizontal component force.The shape size of the main cable saddle of the bridge is 7.5 m×5.6 m×4.8 m,the weight of the side span saddle body reaches 126 t,and the weight of the main span saddle is 119 t.The key technologies such as the casting scheme,casting process,machining and trial assembly of the saddle body of the main cable were studied.The difficulties and key points in the casting process were analyzed.By taking the corresponding process control measures,excellent product quality had been obtained.The results show that the main cable saddle of the bridge after casting,all technical indexes meet the design and specification requirements.

关 键 词：空间自锚悬索桥 主索鞍 一鞍双槽 鞍头铸造 机械加工 试装配 

分 类 号：TG269[金属学及工艺—铸造]