The acceleration of infrastructure construction is inseparable from advanced major engineering equipment. During the "13th Five-Year Plan" period, a batch of technical equipment independently developed by China is making continuous efforts to contribute to the acceleration of infrastructure construction.

The world's first thousand-ton bridge erecting machine completes its first maritime show

Recently, at the construction site of the Fu-Xia high-speed railway, the world’s first thousand-ton bridge erection machine "Kunlun" developed, designed, manufactured and applied by China Railway Construction began to erect the world’s first 1000-ton bridge with a 40-meter span. A cross-sea high-speed rail bridge with box girder-the new Fu-Xia high-speed rail Meizhou Bay cross-sea bridge. This is the first time that the "Kunlun" has been operating under strong offshore wind conditions since its official commissioning, and it is also an important test of the "big country heavy equipment".

It is understood that the "Kunlun" thousand-ton bridge erection machine was jointly developed by China Railway Construction's Fifth Survey and Design Institute Group Co., Ltd. and China Railway 11th Bureau Group Hanjiang Heavy Industry. The equipment system solves the special engineering in the construction of high-speed railways. In addition, problems such as bridge erection and power supply coordination have enabled the upgrading and innovation of China's high-speed rail technology.

"The thousand-ton bridge erecting machine is an all-round bridge erecting machine, which can be compatible with the construction of high-speed rail box beams with spans of 24 meters, 32 meters and 40 meters. It is equivalent to a thousand-ton bridge erecting machine that can support three A traditional bridge erecting machine can reduce the cost of beam erection by 20% and increase the speed of beam erection by nearly 30%.” said Wang Bo, the project manager of the 4-frame beam construction area of the newly built Fuxia Railway in China Railway 11th Bureau. The ton-level high-speed rail box girder transport and erection integrated machine can also carry out wind resistance operations in harsh environments, with a maximum wind resistance level of 7.

It is understood that the traditional bridge erecting machine must be disassembled to pass through the tunnel, which generally takes 3 to 5 days, while the thousand-ton bridging integrated machine can automatically pass through the tunnel without disassembly and assembly. The time saved can be installed to complete a 400 Meter-long high-speed rail bridge. Wang Bo said that the commissioning of this model can effectively reduce the resonance between trains and bridges, make high-speed rail trains run more smoothly and at high speed, and provide technical support and equipment guarantee for promoting China's high-speed rail to 400km/h.

"Beidou" helps construction safety be more guaranteed

At 2:15 on November 9th, at the intersection of Jining East Outer Ring Road and Xinyan Railway in Shandong Province, with the traction of two jacks and a 45-minute counterclockwise rotation, the 18,000-ton swivel bridge was successfully crossed. The Xinyan Railway marks the first breakthrough in the construction of an urban inner ring viaduct in China.

Data shows that this swivel bridge is equivalent to the weight of 12,000 cars, and it has to cross the existing line of the Xinyan Railway to swivel, and the construction risk is greater. Zhang Zhihua, project manager of Jining Expressway of China Railway 25th Bureau, said that in order to ensure safe and accurate rotation, the construction party chose the railway operation "skylight point" from 1:30 to 2:30 in the morning for the rotation construction, and it was earlier in the same type of project. The Beidou satellite navigation system is used to measure and locate the bridge body, and the measurement data is integrated and processed to ensure that the rotating beam is accurately connected to the bridge pier.

"The reason why the Beidou system is adopted is that the signal strength and measurement accuracy of the Beidou system are improved compared with GPS, which is more secure for the safety of the entire project." said Liu Chengqi, chief engineer of the project.

It is understood that, as one of the major innovation achievements China has made by starting from basic research and taking the road of independent innovation, "Beidou" has reached a new level during the "13th Five-Year Plan" period. Starting from November 2017, the high-density launch of 18 Arrow 30 stars, making China the third country in the world to independently own a global satellite navigation system.

"Beidou and other scientific research results have enhanced China's transportation technology strength, expanded technology application scenarios, improved transportation efficiency and service levels, and provided a more efficient way for China's transportation infrastructure construction." Liu Chengqi said.

The shield machine drives the tunnel through the “hanging river” on the ground

A few days ago, beside the Yellow River ferry in Jinan, Shandong, the huge cutterhead of the "Taishan" shield machine broke out of the earth, and the east line tunnel of the "Ten Thousand Mile Yellow River First Tunnel" Jinan Yellow River Tunnel Project took the lead. This marks a major progress in the construction of a shield tunnel with the largest diameter public rail under construction in China, and the first time in human history to cross the "hanging river" on the ground.

It is understood that the Jinan Yellow River Tunnel, the "First Tunnel of the Yellow River in Ten Thousand Miles", has a total length of 4760 meters, of which the shield section is 2519 meters long, and the lowest point of the tunnel is 54 meters under the river bed. According to Dong Bing, the shield tunnel manager of the China Railway 14th Bureau Group, the use of shield tunneling to cross the "river, lake and sea city" is one of the construction methods with the least environmental impact. The Jinan Yellow River Tunnel is designed as a double-tube and double-layer public rail tunnel. The use of shield machines maximizes the utilization rate of crossing the Yellow River at one time and greatly reduces the impact on the environment.

"This kind of project is unimaginable before the shield machine was made domestically." Dong Bing said that as the "king of construction machinery", the technology of shield machine was monopolized by foreign countries for a long time. During that period, whenever the equipment broke down, "foreign engineers" had to be invited to inspect it, and the repair prices and labor costs were very staggering.

In recent years, the localization and industrialization of shield machines with China Railway Equipment and China Railway Construction Heavy Industry as the main leading enterprises have achieved remarkable results. The data shows that the current annual output of China-made shield machines is about 500 sets. According to an average of 60 million yuan per set, the annual output value is about 30 billion yuan and the net profit is about 5 billion yuan.

"The "Outline of the Advanced Railway Planning for a Powerful Country in the New Era" released a few days ago stated that the national railway network will reach about 200,000 kilometers by 2035, including about 70,000 kilometers of high-speed rail." Liu Feixiang, Party Secretary and Chairman of China Railway Construction Heavy Industry Group pointed out. According to different needs, it will continue to strengthen the research and development of new products such as super tunneling machines and super large diameter shield machines, so that the shield machine will truly move from "Made in China" to "Created in China." Editor/Xu Shengpeng