On October 8th, installation of the catwalk mesh began on the Shiziyang Bridge, under Contract Section T9 of the Shiziyang Channel project, a core transportation hub project in the Guangdong-Hong Kong-Macao Greater Bay Area (GBA). The work will provide a stable platform for the subsequent installation of the huge main cables. Each catwalk is 6.26 meters wide, making it the widest construction catwalk on any suspension bridge worldwide.

The Shiziyang Channel serves as another major east-west transportation artery across the Pearl River Estuary. Upon completion, it will further enhance the Guangdong expressway network and foster the integrated development of the GBA city cluster. As a key project along the route, the Shiziyang Bridge is a double-deck steel truss suspension bridge with a main span of 2,180 meters. It sets five world records for double-deck suspension bridges in terms of main span length, number of traffic lanes, main tower height, anchorage foundation, and main cable diameter.

The catwalks serve as temporary elevated working platforms for superstructure construction on the Shiziyang Bridge, including main cable installation. The catwalk system consists of two walkways, one on the upstream side and the other on the downstream side. To overcome construction challenges posed by the exceptionally long 2,180-meter main span, frequent typhoons in the Pearl River Estuary, and complex high-altitude wind conditions, the project team conducted targeted research to address key technical challenges. The resulting catwalk system has a width of 6.26 meters on each side, making it a world-class installation. It is about 50% wider than conventional catwalks used on long-span suspension bridges and can support multiple simultaneous operations during the installation of the huge main cables, which weigh 43,000 tons and have a diameter of approximately 1.5 meters.

Each catwalk is supported by 16 high-strength steel wire ropes, each with a diameter of 60 mm and a tensile strength of 2,160 MPa. The embedded components for the load-bearing ropes underwent specialized load testing to verify their anchoring capacity, and the entire catwalk system also underwent wind tunnel testing. The project became the first in the industry to deploy rope climbing robots for rope inspection and measurement, reducing the risks of manual measurements at height.

The project has also established an integrated intelligent monitoring system combining structural force monitoring, equipment status monitoring, and early weather warnings. The project team is currently laying the catwalk mesh, installing guardrail ropes, and erecting transverse access walkways, with catwalk installation scheduled for completion by the end of the year.

世界最宽猫道开启面网铺设

10月8日，粤港澳大湾区核心枢纽工程狮子洋通道T9合同段狮子洋大桥猫道面网正式开始铺设，为后续超大主缆架设筑牢作业平台。该猫道单幅宽度达6.26米，是目前世界最宽悬索桥施工猫道。

狮子洋通道是珠江口东西向又一交通大动脉，建成后将完善广东高速路网，推动粤港澳大湾区城市群一体化融合发展。作为全线控制性工程，狮子洋大桥是主跨2180米的双层钢桁悬索桥，创下双层悬索桥“主跨跨径、车道数量、主塔塔高、锚碇基础、主缆直径”五项世界第一。

猫道是狮子洋大桥主缆架设等上部结构施工的高空临时作业平台，分上游、下游两幅。针对2180米超大跨径、珠江口海域台风多发、高空风场复杂等施工难题，项目团队开展专项科研攻关，建成单幅宽度6.26米的世界级猫道，比常规大跨悬索桥猫道宽度提升约50%，可满足重达4.3万吨、直径约1.5米的超大主缆多工序并行作业需求。

单幅猫道承重索采用16根直径60毫米、强度2160兆帕的高强钢丝绳；承重索预埋件完成专项锚固力荷载试验；整套猫道体系通过专业风洞试验。项目在行业内首次运用爬绳机器人开展绳索测量作业，可减少人工高空测量风险。

项目同步搭建“结构受力监测+设备工况监控+气象超前预警”三位一体智能监测体系。目前，项目团队同步开展面网铺设、护栏绳安装、横向通道架设等施工，计划年底前完成猫道架设。

文、图｜记者 王丹阳 通讯员 卢志勉
视频 | 王丹阳 曾育文
翻译 | 黄健新
英文审校 | 曾敏