Wear 3 big mountains and across 8 rivers ... Zhengyu's high -speed rail line outlines it like this

When the Zhengyu High -speed Railway, which is 350 kilometers per hour, has three mountains such as the Bayshan, Jingshan, and Wumiu Mountain, and across 8 large rivers and rivers across the Meixi River, the Daying River, and the Han River. How did the "Metro" high -speed rail operating line outlined by a bridge -to -tunnel ratio of more than 98%of the tunnel outlined? What problems did you encounter during the line selection process?

A few days ago, Xiao Qiang, deputy chief engineer of the Chongqing Company of China Railway Second Hospital and the executive deputy chief designer of the Chongqing Company of China Railway, revealed the story behind the "selection of the line" of the Zhengyu high -speed rail.

The railway line selection has an overall situation and has a strong systematic comprehensiveness. It involves multi -disciplinary and majors. It is an extremely complex system engineering. Generally speaking, the railway line selection should consider all aspects of factors, such as geological layers and environmental protection of the regional regions, and the distribution and planning of cities and towns along the line. The final line direction and spatial layout must be technically feasible, safe, reliable, and economical.

In Xiao Qiang's opinion, the selection of Zhengyu's high -speed rail selection needs to overcome the three major difficulties.

Difficulty

Geological development of terrain ups and downs

"The direction of the line is the first difficulty facing the team." Xiao Qiang said that the Zhengyu high -speed rail started at the Huanghuai Plain, and entered the Yangtze River Corridor through the Nanxiang Basin and the southern foot of Daba Mountain. It makes it difficult to survey design. The line is going, to avoid widely distributed landslides, mudslides, collapse, and rock -soluble water, and reduce the risk of railway construction and operation from the design source. This requires the design team to carefully follow the line scheme.

"What we have to do is to make every bridge and every tunnel be 'fixed' in a safe and reliable position." Xiao Qiang said that in order to do this, the team made great efforts.

Little Three Gorges Tunnel

As far as the Little Three Gorges Tunnel in Chongqing is concerned, this total length is about 18.9 kilometers. So far, the longest tunnel of similar standards in China has passed through many complex geological structures such as Qiyu Mountain.

“当时，为了搞清楚隧道在经过中垌河峡谷地段时，是线路拔高做桥梁，还是埋下去做隧道，在我们开展了大量纸上方案研究后，需要进行现场踏勘核对。”肖强说， At that time, Zhongyu River was a deep canyon with a depth of thousands of kilometers. At that time, there were no smartphones, no navigation maps, and surveyed in the mountains. By identifying the position of the equal line on the map, the poisonous snake and mosquito bites on the road are commonplace.

The small Three Gorges Tunnel in construction (information picture)

"We traveled along the winding cliff, on the one hand, the bottom of the canyon, and on the other is the cliffs that were not seen. Everyone dared to look forward and did not dare to look at the side." Recalling the scene at the time, Xiao Qiang was vividly visible, and When the survey was less than half of the trip, the climate changed, and there was a heavy rain. Everyone insisted on traveling in the heavy rain. Someone was stabbed by plants and someone fell. Kung Fu is worthy of the people. After half a day of hiking, he finally arrived at the design of the design of the design. He figured out the engineering geology of the front and rear, and provided support for the correct decision of the latter plan. The science and effectiveness of the early line direction plan has created more favorable conditions for subsequent construction from the source of the design. The Little Three Gorges Tunnel is eventually opened for about one year in advance than the original design speculation, and has received unanimous praise in the industry.

Difficulty Two

Multi -ecological environment protection requirements for environmental sensitive areas are high

"Zhengyu's high -speed railway Chongqing section line is adjacent to the Yangtze River and walks on the north bank. The Yangtze River is the mother river of our Chinese nation. This has high requirements for the environmental protection of project construction. Therefore, we attach great importance to environmental protection in design." Xiao Qiang said.

Daning River Two -Line Bridge Steel Heilong (Data Map)

In response to the characteristics of environmental sensitivity and high ecological environmental protection requirements, the team carried out the special work of environmental protection line selection. Xiao Qiang said that there are nearly a hundred environmental sensitive areas around the line, including 33 nature reserve, 9 scenic spots, 15 forest parks, 1 wetland park, 25 water source reserve, and national focus on cultural relics and historic sites. Protective animals and plants.

During the survey design, they must first find out the scope of the sensitive area and analyze the degree of influence. When selecting the line, it is mainly based on the evasion of these environmental sensitive areas. If it is indeed unable to avoid the larger range, the tunnel is adopted in a harmless way to minimize the impact on the environment.

Such as the mountains where the tunnel project crosses is as far away from the waters of the Yangtze River; concentratedly stacked the slag, and adopted measures of greening and reclamation; the bridge project adopts a properly increased span through the water body to reduce the water pier in the water and the water body and the water in the water. The impact of the class; the roadbed project should be reduced to high -filling and deep excavation, so that the natural environment around the railway maintains the original appearance to the greatest extent, so that the railway engineering and the natural environment are coordinated and integrated.

The Pengxi River Special Bridge in construction (data map)

Difficulty three

The site selection of the site is neither affecting the environment and can stay in development space

The selection of railways has an important impact on local socio -economic development along the railway. How can we not affect the urban environment and leave enough room for the development of the city? This is the third problem faced by Xiao Qiang and the team.

The first column of 500 meters long track into the pavement base (information picture)

"Nearly without entering." This is the concept of site selection concept adopted by the team's line design for entering the urban section. Xiao Qiang explained that the first "near" was close, and the second "advancement" was entering. Simply put, it is close to the urban area, but not entering the city.

"The site selection is not as good as possible in the city and scenic spots to reduce the impact of engineering construction on the environment, but it cannot be blindly allowed to go far. It should be reduced as much as possible to facilitate passengers to travel and reflect the people -oriented service concept. The planning and development of the plan is to grasp this distance. "Xiao Qiang said that when the line was selected, they fully considered these factors for the site selection of the new high -speed rail stations. The development of the district is truly effective in the site selection and urban development. Zhengyu high -speed rail trial operation vehicle group

Reporter's note:

From the research on project planning in 2010 to the later design, Xiao Qiang and his partners participated in the Zhengyu high -speed rail project for more than 10 years. At that time, he was a 25 -year -old guy, and he is now nearly confused.

When Xiao Qiang interviewed, every bit of Zheng Yu's high -speed rail, every bridge, tunnel, or even every fine data, he was like a few treasures, as if it was something that happened yesterday.

Xiao Qiang told upstream news reporters that this high -speed rail changed from design drawings step by step to reality. He witnessed the dragon of each bridge, the penetration of each tunnel, and the standing of each station. Essence The Zhengyu High -speed Railway is about to open, and he has a joy in his heart that cannot be expressed in words.

Thanks to these designers and builders, they are silently paid behind them to make urban transportation more smooth and make the masses travel faster.

Upstream journalist Jiang Bo Li Jing

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