长宁试采干线南广河跨越桥为单幅悬索桥，该桥上部结构形式为三跨吊桥，主跨跨度为180米，主索垂度为18米，主缆及风缆主索采用5毫米平行钢丝束，锚具采用固定热铸锚和双螺杆调节式热铸锚，塔架采用A型钢塔，北岸主缆锚碇采用以预应力锚索作为主要受力构件的隧洞锚，南岸主锚采用重力式锚碇。

跨越管道检测包括检查悬索系统、抗风系统、主塔系统、锚碇系统等工作性能，模拟计算主缆、钢桁架及对应斜杆截面强度、主梁跨中断面挠度，通过开展主缆索线形测量等方面工作，验证各结构线形与倾斜度是否与设计线形与倾斜度一致，结合各项检测结果和有限元分析结果，评估跨越承载能力是否满足设计载荷等级要求，得出全桥检测结论并给出桥梁状态评定和维护建议。

跨越管桥作为油气管道的关键组成部分，其安全性与稳定性至关重要。2023年以来，安全环保与技术监督研究院针对管道跨越结构启动专项科研项目，深入研究特殊工作环境下的管桥系统，调研国内外先进检测技术，同时基于管道跨越工程结构静动力学特性规律，确定管道、支撑连接构件薄弱环节，针对跨越管桥结构不同部分提出有效的检测方法，对已有跨越管道必检点进行分类，从而构建典型跨越管桥的检测维护指导意见。

The Nanguang River span bridge of Changning Test mining main line is A single-span suspension bridge. The upper structure of the bridge is a three-span suspension bridge, the main span is 180 meters, the main cable sag is 18 meters, the main cable and wind cable are made of 5 mm parallel steel wire bundle, the anchor is made of fixed hot-cast anchor and twin-screw adjustable hot-cast anchor, and the tower is made of A-type steel tower. The main cable anchorage on the north bank adopts the tunnel anchor with the prestressed anchor cable as the main force member, and the main anchor on the south bank adopts the gravity anchor.

Cross-pipe inspection includes checking the performance of suspension cable system, wind resistance system, main tower system, anchorage system, etc., simulating the section strength of main cable, steel truss and corresponding inclined rod, and the mid-section deflection of main beam span, and verifying whether the alignment and inclination of each structure are consistent with the design alignment and inclination through the alignment measurement of main cable and other aspects. Based on the test results and the finite element analysis results, the paper eva luates whether the straddling load capacity meets the requirements of the design load grade, draws the conclusion of the whole bridge test, and gives the bridge condition assessment and maintenance suggestions.

As the key component of oil and gas pipeline, the safety and stability of crossing pipe bridge are very important. Since 2023, the Institute of Safety, Environmental Protection and Technical Supervision has launched a special scientific research project for the pipeline crossing structure, conducted in-depth research on the pipe bridge system under special working environment, investigated advanced detection technologies at home and abroad, and determined the weak links of the pipeline and support connecting components based on the static and dynamic characteristics of the pipeline crossing engineering structure. According to the different parts of the bridge structure, effective detection methods are proposed, and the required inspection points of the existing bridge are classified, so as to construct the inspection and maintenance guidance of the typical bridge.