Set a new record, the two super high-level "hand in hand" success

Recently, the Sofitel Malaysia Hotel Complex Project of Beijing Urban Construction North Group successfully completed the overall upgrading of the air steel bridge between T1# building (345 m) and T2# building (233.6 m), successfully "holding hands". The lifting height is 204.25 meters, setting the latest record for lifting heavy steel bridges in Malaysia.

The connecting bridge frame is composed of 369 steel members, the lifting height is high, and the installation of special-shaped steel structure is difficult. After careful planning, the project team decided to adopt the "overall lifting construction technology of ultra-high special-shaped steel structure", first completing the assembly and welding of the corridor on the ground, and then lifting the whole to the designated position.

Forty workers worked day and night, like "building blocks" on the ground work platform, and it took 8 weeks to complete the overall assembly of the steel bridge.

Due to the high lifting height, the project team faces many challenges, such as precision control of the lifting process, stability control and weather factors. Before the upgrade, the project team conducted several program demonstrations, simulated the upgrade process through BIM and checked the data to finalize the program.

The ascension process is equally challenging. The project team strictly controlled the lifting construction steps. Hydraulic devices capable of lifting 40 tons were installed at four lifting points. Through 4 groups of 4 steel strands with a diameter of 25mm in each group, under the traction of heavy hydraulic lifters, the steel continuous bridge was steadily "lifted off" at an average speed of 20 meters per hour ". After 10 hours, the steel continuous bridge finally reached the designated position smoothly.

Accuracy and stability control is the top priority to improve the work. The project team monitors stress and instantaneous wind speed changes in real time to ensure safety and stability. The surveying personnel made counterpart measurements in the tower to ensure that the corridor is consistent with the design height. When the corridor is lifted to about 20cm from the design height, the corridor is slowly lifted to a precise position by using the "fine-tuning and inching" function of the computer system. Subsequently, the measurement group quickly carried out positioning correction, temporary fixation and welding connection to complete the last step of high-altitude connection.

The successful promotion of the super high-rise steel bridge not only shows the strength of the group in the field of super high-rise construction, but also accumulates the core technology for the group's super high-rise product line.