The CRCC unit accelerates innovation in infrastructure projects

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BEIJING: Builders from China Railway 24th Bureau Group Corp Ltd (CR24), a unit of state-owned China Railway Construction Corp (CRCC), rely on innovative in-house solutions to meet various challenges and accelerate the progress of its projects infrastructure, while the Covid-19 situation is better controlled nationwide.

Ahead of the start of daily operations Thursday on the Beijing-Shanghai Railway and the Shanghai-Nanjing Intercity Railway, a Benfa Road overpass in Changzhou, Jiangsu Province, can be seen above the tracks of both busiest railways.

This not only marks a milestone for the road project as it is a success after many challenges, but also another valuable example for all other construction teams facing similar technical issues nationwide.

CR24, the builder of the bridge, attributes the success of the construction of the viaduct section to its bespoke solutions using steel box girders and digital tools.

Without disrupting the normal operations of the two railways, the builder managed to “smoothly walk” tons of steel box girders 86 meters to their destination, with errors controlled to just three millimeters, Xie said. Yuanfang, project designer at CRCC.

He added that to protect the daily operations of neighboring railways, each of which has more than 110 trains, CR24 workers can only take advantage of train maintenance hours to build the viaduct section every day.

“The construction of the overpass section was carried out using two 150 tonne jacks and four heavy object movers of 400 and 600 tonnes each. The steel box girder moves smoothly at a speed of 30 miles per hour until it reaches its destination,” Xie said.

Xie said the whole push-up process took about seven hours, over three days – from Thursday to Sunday – due to concerns about the normal operation of the two railways.

Being a “tailor-made” for each of his infrastructure projects has become a key element leading to project success for his team, which requires many innovative solutions covering all specific construction conditions, Xie said.

Xie’s words are well reflected in another project in Shenzhen, Guangdong province, where a shield tunnel boring machine recently started operations on the second phase of Shenzhen Metro Line 16, laying a solid foundation for larger-scale tunnel works in the second half.

To ensure a successful start of tunneling, CR24, together with the future metro operator – Shenzhen Metro – carried out adequate preparatory work, such as setting up high-quality construction resources, transportation plans .

CR24 also managed to complete the lifting, installation and commissioning of the tunnel boring machine, which are essential for a safe and efficient start of the excavation works.

In the shield tunnel section, there are many challenges to overcome, such as river tributaries, workshops, highways and the Wutong River – all located at the underpass in the project sections, the company said. .

“In response to these issues, and with reference to previous construction experience, our engineers are making targeted designs of the shield tunnel boring machine, including designs to improve the stiffness, strength, and bearing capacity of the cutter seat to ensure the efficiency of hard rock breaking.

“We are also adjusting the distance between the front knives and increasing the hardness of the excavation in the middle of the section,” said the CR24 project manager, who requested anonymity.

With a total length of approximately 9.46 km, the fully underground second phase of Metro Line 16 departs from Dayun Station (not included) and ends at Xikeng Station, containing eight stations – including two transfer stations – in total. So far, construction of six of the stations’ main structures has begun.

According to data from the National Bureau of Statistics, China’s fixed asset investment growth improved to 5.8% year-on-year in June from 4.7% in May, driven by a pick-up in infrastructure investment. 8.2% YoY and Manufacturing. investment growth of 9.9%.

Infrastructure investment is becoming a strong anchor for China to stabilize growth.

As traditional infrastructure is still underdeveloped and has weak links due to its unbalanced growth, industrial modernization and transitions to cleaner and greener energy require large-scale investments in “new infrastructure”, said Yu Xiangrong, chief economist for China at Citigroup. – Chinese Daily/ANN

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