China Railway 2024-07-06 22:17 Beijing
On June 30, the Shenzhen-Zhongshan Corridor, a super project in the Guangdong-Hong Kong-Macao Greater Bay Area, which attracted worldwide attention, was officially opened to traffic.
China Railway Shanqiao and China Railway Baoqiao, subsidiaries of China Railway Industry, undertook the manufacturing of steel box girders for the G05 contract section and G04 contract section of the Shenzhen-Zhongshan Corridor, including the steel box girder of the Lingdingyang Bridge, Zhongshan Bridge, the non-navigable hole bridge in the Hengmen Flood Discharge Area, the non-navigable hole bridge in the West Flood Discharge Area, the non-navigable hole bridge in the shallow area, the Wanqingsha interchange ramp bridge and the steel structure of ancillary facilities, involving a total length of 7.24 kilometers and a total weight of about 183,000 tons.
A New Journey of Wisdom: The Road to Intelligent Construction——
China Railway Industry has researched and applied the "Key Technology of Intelligent Manufacturing of Bridges and Tunnels for Cross-sea Cluster Engineering", and has created a "four lines and one system" intelligent equipment cluster with the intelligent cutting and cutting production line of plates, intelligent welding production line of plate unit, intelligent assembly production line of segments, intelligent coating production line of steel box girder and intelligent management and control system of workshop manufacturing execution as the core, so that the utilization rate of intelligent equipment for plate unit manufacturing has reached 100% and the production efficiency has increased by 30% Above, the efficiency of intelligent sandblasting is increased by 5 times compared with the traditional manual sandblasting, and the automation, digitalization, networking and intelligence level of steel box girder manufacturing are comprehensively improved.
At the same time, the project team of China Railway Industry takes solving the common problems in the industry such as the fatigue damage of the steel box girder orthotropic bridge deck as the breakthrough point, and organically integrates the automated production line and digital equipment such as welding, assembly and coating robots to meet the characteristics of large structural size, diversified welding positions and high precision requirements of the steel box girder segment, and the production efficiency has been increased by more than 30%, the weld quality is stable, the average pass rate of one flaw detection is more than 99.9%, and the pass rate of the roof U-rib full penetration weld flaw detection is more than 98%.
Innovation-driven: technological breakthroughs and applications——
In the face of many challenges such as "high", "new", "special" and "difficult", complex space curves, and large segments of ultra-long and overweight steel box girders, the project team of China Railway Industry actively carried out scientific research and overcame the problems of the overall production and transportation of large sections of curved steel box girders, and formed a complete set of production and loading technologies such as U-rib double-sided submerged arc full penetration welding technology, key technology of large section whole hole production and linear control of curved steel box girders, and lateral roll-off loading technology of long steel box girders, which provided technical reference for the subsequent development of steel bridge manufacturing in the mainland.
At the same time, it actively applies new technologies, new equipment and new processes, and takes the lead in applying U-rib laser cleaning equipment in the field of bridge manufacturing, which has outstanding advantages such as high quietness, environmental protection and smoke-free dust, and greatly reducing manual labor intensity. The first company in the industry to develop and apply a four-arm collaborative welding robot, using vision-assisted programming to realize the multi-state welding of U rib unit and the welding of joint plate welds, four welding arms work at the same time, and the welding efficiency is increased by 1 time. The laser edge cutting equipment is introduced in the manufacturing of the plate unit, and the laser multi-point identification is used to directly cut after confirmation, and the plate edge allowance and butt groove are cut at one time, which effectively reduces the labor intensity and improves the quality and efficiency of work.
Overcoming difficulties to win: Lingding Bridge sees strength——
The bridge deck of Lingdingyang Bridge is 91 meters away from the sea surface, the main span is 1666 meters, the navigable clearance height is 76.5 meters, and the main tower is 270 meters high, which is equivalent to a 90-storey building. The hoisting work of the bridge began on January 12, 2023, the full bridge was closed on April 28, and all the welding work of the annular joint of the whole bridge was completed on May 28, setting a new record for the annular joint construction of the suspension bridge. During the construction process, considering that the temporary matching parts between the connecting beam segments only provide weak stiffness, which is not conducive to typhoon resistance, the project team of China Railway Industry innovatively proposed a new technology of lifting and welding combination in the steel box girder hoisting process in order to complete all the welding work before the typhoon. The angle between the adjacent two beams is adjusted by applying tension or bracing force through the temporary tie rod, so that it meets the linear shape before the second phase of dead load loading, so that the possibility of welding the two beams during hoisting is realized.
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Executive Editor-in-Chief丨Li Yuan, Shen Su
Editor in charge丨Xu Huimin, Xue Qiaorui (industrial)
Content source丨China Railway Industry
China Railway Rong Media Center