China High Speed Rail: Flying to Chongshan

◎ Text "Fighter" magazine all media reporter Yao Yao

▲ Information pictures of Gaoan Station, Jiangxi Duan, Shanghai -Kunming Passenger College

The wind is galloping and a thousand miles around the mountains, in the mountains, on the bridge, and in the tunnel, the Chinese high -speed rail uses beautiful arcs to penetrate the land of Shenzhou. It is not easy to achieve today's "China speed". China's high -speed rail can "fly" from the area near the sea level to the plateau with an altitude of thousands of meters; it can also reach the south of the spring from the cold north. Not only landscapes along the way, but also the wisdom left by the builders of the high -speed rail.

Shanghai -Kunming high -speed rail and landforms fighting wisdom

From February 2009 to December 2016, after nearly eight years, the Shanghai -Kunming Expressway Railway, which connects Shanghai and Kunming, Yunnan Province, opened to traffic. This is one of the "Eight vertical and Eight Heng" high -speed railway main channels in the "Medium and Long -term Railway Network Plan" (2016 edition). After the opening of the Shanghai -Kunming high -speed railway, from Shanghai to Kunming, it was shortened from more than 20 hours to about 8 hours.

"The Shanghai -Kunming high -speed railway Yunnan section started in 2010 and encountered many problems in construction." Xiong Liven, the chief engineer of the Shanghai -Kunming High -speed Railway Yunnan section project of the Shanghai -Kunming 16th Bureau, participated in the construction of the Shanghai -Kunming high -speed railway Yunnan section. On July 9th, he told the "legal person" reporter that the project is located in the center of the Yunnan -Guizhou Plateau and belongs to the plateau of the plateau basin and the plateau. With the activity broken zone area, the geology is complex, and the stratum is fragmented, which brings great challenges to the construction of the high -speed rail.

Xiong Liwen introduced that at that time, the team carried out research on "Comprehensive Railway Construction Technology under the High Earthquake Mountains". The abbreviation of Gravel means that cement powder and coal ash crushing piles are mixed with gravel, stone dandruff, sand, and flour ash mixed with cement and mix with water. Key parameters such as inlet speed, current value, extubation speed. Through experiments and construction, optimize the improvement of the construction process, first distribute piles, then construction, and accelerate the construction progress. Finally, a series of problems that CFG piles need to pay attention to in the construction process to ensure the quality of construction. As I wish, the earthquake fracture belt is weak and crushed, the groundwater is rich in drilling piles, and the large -scale weak geological deformation tunnel is rich in groundwater.

In addition to technical problems, workers' bodies must also be tested by nature. In the cool summer of the Yunnan Plateau, workers are often sunburned. When building a tunnel, due to the humidity and sultry air, the workers can only connect the air duct from the outside to the hole, and use a fan outside the cave to blow the wind into the cave and try to ventilate it as much as possible.

It is understood that due to restrictions on the construction period, the team race with time regardless of the day and night. In the rail structure that replaces the scattered gravel latch, also known as the rail technology today, which is used as an overall foundation such as concrete and asphalt mixture, it is also known as the world's advanced rail technology). The progress of 600 meters per day was rapidly advanced, and the 33.37 kilometers of no -orbital construction tasks were completed 15 days in advance.

Gan -Shenzhen high -speed rail solving tunnel technology difficulties

At 9 am on December 10, 2021, with the G2197 train from Ganzhou West Station to Shenzhen North Station, the Beijing -Hong Kong High -speed Railway Ganzhou to Shenzhen section was officially opened. After the opening of the Gan -Shenzhen high -speed railway, it ended the history of no direct to the Guangdong high -speed railway in the south of the Gansu. The entire province of Guangdong realized the "city -pass high -speed rail".

▲ Figures of the main line of Gan -Shenzhen high -speed rail overlooking information pictures

In the construction of the Ganshen high -speed rail, tunnel construction is an important part. On July 8th, Liu Yexing, Secretary of the Party Working Committee of the Jiangxi section of the Gan -Shenzhen high -speed railway of China Railway 16th Bureau, told reporters: "Our branch construction is about 15 kilometers long, and the tunnel accounts for 11 kilometers. Buried, if you encounter unexpected rocky water or cracks, it is prone to collapse. "

For tunnel construction, the surrounding structure process is very important. Liu Yexing told reporters that the project is mainly based on IV and ⅴ -level surrounding rocks. All tunnels have bad geology such as shallow buried segments, groundwater development sections, rock explosion, ground temperature, and faults. There are many uncertainty in risks and construction.

In this regard, Liu Yexing's team adopts ground stress prediction technology and micro -seismic detection technology to arrange monitoring systems. Based on the dynamic updated tunnel packet speed model, the large deformation paragraph is accurately positioned. Early warning methods of information strengthen the early warning mechanism of surrounding rock deformation rocks.

"We are also equipped with standardized chemical equipment such as the full hydraulic mobile ride -like stretch trestle, the winding type two -lining building, the semi -automatic waterproof board car, the wet spray robot, and the integrated RPC molten slurry machine. The safety and quality management level of the tunnel construction process. "Liu Yexing said.

In addition, the team also uses advanced advanced objects such as geological radar to predict the palm noodles (also known as the mules, which is a term in the tunnel construction, that is, the work surface of the tunnel to keep moving forward) , The integrity and rich water of the production state and its surrounding rock structure provides a scientific basis for the correct selection of excavation surface, support design parameters, and optimizing construction plans, and provide early warning information for the prevention of catastrophic accidents that may prevent tunnels. "We use the information management platform to integrate the management and control of construction video surveillance, schedule image management, fence measurement, pre -geological forecasting, safety risk control and quality problem supervision to provide convenient conditions for the smooth progress of the project." Liu Yexingxingxingxingxing introduce.

In the process of construction, it is also a big challenge to take into account environmental protection. It is understood that from the north of Jiangxi Province, Jiangxi Province, Ganzhou City, and Shenzhen City in the south, through the humanistic landscapes and nature reserves of Wanlu Lake and Jiulian Mountain. Liu Yexing introduced that the project department adheres to the construction of green and environmental protection, and adheres to the principle of "blocking first and then abandonment" (the blocking project of the residue field is abandoned, and the discard is abandoned. Abandoning residue) ensure the orderly advancement of greening and re -cultivation.

Wu Zhongcheng Tiejian Bridge creates Ningxia speed

Under the Helan Mountain, the sky is high. In October 2016, the Wuzhong Intercity Railway started.

"Our tasks are mainly bridges. The more difficult problem is the construction period." On July 8th, Ma Xinhui, chief engineer of the Wuzhong Intercity Railway No. 1 branch of China Railway, told reporters that the team entered the market on June 10, 2016. However, the line should be completed on August 30, 2018. The construction period itself is very nervous: "In order to complete the project as scheduled, the team worked 24 hours a day and night, tied steel bars during the day, and poured concrete at night.

Ma Xinhui introduced that the node of the beams is fixed. If the front beam cannot be passed, the later project cannot continue. "At first, how we could not calculate the construction period, we could only communicate repeatedly with some construction units and design units. Finally, through a series of measures, the original 3 -meter section was optimized to 5.5 meters to 6 meters, which greatly saved the construction of construction construction, which greatly saved the construction of construction. time."

Ningxia's special climate has also brought a lot of trouble for construction. On July 10, Shao Dexing, chief engineer of the Wuzhong Intercity Railway Project of China Railway 16th Bureau, told reporters that watering needs to be watered during the maintenance of the bridge, but the Northwest region is dry and rainy, and the summer is hot. "

"After continuous exploration, the method of pulling water was abandoned. The project team decided to put a large bucket on the pier on the bridge pier. The workers kept adding water to the barrel, and finally solved the problem of bridge maintenance." Introduce that summer bridges need to be watered and maintained, and the warmth of the bridge should be considered in winter. The design and warm shed in the concrete pouring area, the tensioning slurry area, and the maintenance area are a novel and economical method that Shao Dexing's team came up with.

In this way, after 14 months, the offline main project of the project was basically completed, and the 500 -meter long rail was smoothly laid. In August 2018, all construction projects were completed as scheduled, but due to various reasons, the project was postponed. Shao Dexing introduced that in June 2019, the Wuzhong Intercity Railway passed static acceptance throughout the line; on November 5 of the same year, preliminary acceptance was passed. Experts have determined that road bases, bridges, rail engineering meets the standards, and the quality of the quality of station buildings, motor vehicles, and contact networks has set up new standards for the construction of high -speed railway at 250 kilometers per hour.

Ma Xinhui introduced that during the peak, more than 10,000 workers were fighting the front line every day. Thousands of machinery and equipment kept day and night, and the maximum monthly output value exceeded 1 billion yuan, creating the "Ningxia speed" of China's high -speed rail construction.

Editing ｜ Cui Xiaolin

Edit ｜ Bai Kui

School pair ｜ Zhang Bo Zhang Xuehui

This article is published in the "Legal person" magazine in July 2022 The total 221 cover story column

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