Outside Renqiu City, a low tower cable-stayed bridge spanning the G45 Daguang Expressway rises from the sky, with a total length of 441.7 meters, a main span of 220 meters, and a tower height of 29 meters. During the construction above the Benyong Expressway, the CRFG builders used their technical ingenuity and party building to tackle the most difficult projects along the entire route, delivering excellent results.

Four technologies to overcome difficulties

The project team has focused on innovation and multiple achievements have been patented. The maximum excavation depth of the main pier of Bridge 799 is 9.67 meters, and the edge of the foundation pit is only 2.5 meters away from the high-speed slope. The vibration of high-speed traffic causes complex stress on the soil layer. A near high-speed deep foundation pit composite support structure has been developed to disperse soil pressure and counteract vehicle vibration, and has been granted a national patent. Faced with the pressure of late entry and early track laying nodes, the innovative combination of bracket cast-in-place and cantilever pouring method was adopted to break the bottleneck of full cantilever pouring, which was 2 months ahead of the original plan. We have developed a detachable hanging basket anti fall net device, which features a four sided enclosure and a bottom cover for three-dimensional protection, eliminating the risk of falling and obtaining a utility model patent. In response to the problem of asymmetric structure with a main span of 220 meters, there are 21 suspended pouring segments in the middle span and 19 side spans, with the maximum segment weighing 31.4 tons. Pre pressure balancing is used to balance the load, and the closing error is controlled within 3 millimeters.

Intelligent green protection boutique

The project department adheres to the concepts of intelligent construction, green construction, and lean quality improvement, and uses Midas/Civil to build a finite element model of the entire bridge, simulating stress and deformation with 276 nodes and 360 elements. Build a parametric modeling program based on Revit secondary development, complete full component modeling, avoid conflicts between pipelines, steel bars, and embedded parts through collision detection, and rely on 3D visualization disclosure. The application of fully automatic spray curing system for beam suspension tower ensures timely and quantitative curing, guarantees concrete quality, and saves water resources. Promote standardized and intensive management, construct mixing stations and steel processing plants, equip them with CNC equipment, and achieve precision and standardization. Keywords: low tower cable-stayed bridge、CRFG

Building a solid foundation for Party building

The project department deepens the integration mode of party building, deeply linking party building with safety production, quality improvement, and progress tackling. Establish a Party member safety supervision post, with Party members stationed at the front line, closely monitoring high-risk areas such as high-altitude operations, large machinery, and cross road construction, to achieve zero safety accidents and hidden dangers throughout the entire process. Establish a Party member quality pioneer post to control key processes such as raw material acceptance and core process pouring. Establish a Party member assault team, scientifically coordinate resources, optimize plans, lead builders to fight day and night, and solve construction bottlenecks. The successful completion of the low tower cable-stayed bridge spanning the Da Guang Expressway is a result of the deep integration of technological innovation, intelligent green construction, and party building. The next step will continue to deepen the construction of high-speed rail, contributing to the improvement of the national high-speed rail network, empowering regional economy, and serving the construction of Xiong'an New Area.Editor/Min Jing