BCEG has set a new national record through promoting the Construction of Beijing Winter Olympic Games with Science and Technology. Recently, the Construction Research Institute of BCEG has successfully implemented the tension of cable-net structure of single-storied, bidirectional, orthogonal and saddle-shaped roof for National Speed Skating Hall, filling the technical gap of synchronous tensioning of the first large tonnage, large area and super large span single-layer orthogonal cable net in China.

The National Speed Skating Hall is the landmark of Beijing 2022 Winter Olympic Games. Its hyperbolic saddle-shaped roof has a long span of about 200 meters and a short span of about 130 meters. The roof cable-net structure consisting of 158 roof cables and 120 curtain wall cables outside the truss is supported by a circumferential steel ring truss. The overall weight of the roof cables and joints is about 960 tons. How to balance the tension produced by the cable during tension and ensure the stability of the ring truss structure in the process of large area and large tonnage cable net tension forming has become the core technical problem to be solved during tension implementation.

BCEG undertook the design and implementation of the roof tensioning scheme for National Speed Skating Hall. Faced with the complex structure, the scientific and technological team relied on rich practical experience, three-dimensional entity lofting, finite element analysis and other technical means to simulate the whole process of construction, and deepened the design of key nodes and elements affecting cable network tension, such as tensioning otic placode and lifting tensioning tooling. And the tension process of cable net construction of low-altitude assembly and integral traction lifting was determined, aiming to achieve the optimal overall planning of safety, cost and schedule.

In the process of cable net assembling and laying, the scientific and technological team relied on advanced means of science and technology to accurately calculate the length and marking force of the cable, and set up a detailed and reliable whole-process monitoring scheme for the cable force and the deformation of the key points. Through accurate calculation, the team confirmed the maximum space requirement of the cable assembling at low altitude and the nearest safety distance from the stand. Also, the needle-piercing construction operation was completed between the stand structure and the cables, which helped to ensure the accuracy, stability and safety of each step of construction.

After 120 days of intensive work, the construction was successfully completed, and the data tended to the theoretical value with a high degree of coincidence.