Recently, with the precise placement of the final portal steel cap beam, the hoisting of six large-tonnage steel cap beams over the existing Xiamen-Shenzhen Railway line for the Shenzhen-Shanwei Railway SSSSG-5 bid section, constructed by China Railway 23rd Bureau Group and managed by Xiamen-Shenzhen Railway Guangdong Co., Ltd., was successfully completed.
This operation, involving the continuous hoisting of five or more large-tonnage portal steel cap beams across an active railway line at an extremely small angle of 9.12 degrees, is a first in China's high-speed railway construction field.
The work on the bridge over the Xiamen-Shenzhen Railway faced dual challenges: On one hand, the 9.12-degree small-angle crossing of the active line made high-altitude operations susceptible to crosswinds. The work area was adjacent to the high-speed railway's overhead catenary system, leaving extremely low tolerance for component alignment errors, and placing immense pressure on preventing foreign object intrusion and falling objects. On the other hand, the engineering team needed to hoist multiple large-tonnage steel cap beams densely during nighttime maintenance windows. Each beam weighed between 219.5 and 269.2 tons, with large dimensions, making the coordination of continuous hoisting extremely difficult, classifying it as a high-risk operation near an active railway line.
To efficiently overcome these construction challenges, the project management team of China Railway 23rd Bureau Group made scientific preparations in advance. Before construction, the project department established a multi-party joint prevention and control mechanism, deploying integrated monitoring points for settlement, displacement, and intrusion across the entire work area, implementing 24-hour dynamic monitoring. They also enforced a full-process supervision system involving management, technical, and safety personnel, with dedicated protection teams on duty, comprehensively building a safety protection barrier for the active railway line.
Starting from the early hours of June 17, one steel cap beam was hoisted during each nightly maintenance window. Teams for hoisting command, crane operations, safety protection, quality monitoring, and anchoring worked with clear division of labor and close coordination, strictly following the specialized plan for orderly construction. All six steel cap beams were precisely placed, with the entire process being safe and controllable, meeting quality standards. This successfully solved the technical challenge of continuously hoisting multiple large-tonnage steel cap beams across a railway line at a narrow angle, setting a new record for small-angle bridge construction over busy active railway lines in China.