The longest railway tunnel under construction in Zhejiang Province is smoothly connected

Correspondent Yuan Ruiyu Li Teng Liu Xiaofe

On September 10, the 14.6 kilometers of the Golden -Emperor Railway Qianshiyan Tunnel with a total length of 14.6 kilometers was successfully connected, marking the breakthrough progress of the first "double -layer high container" transportation railway -the construction of the Golden Emperor Railway.

The Qiansan Tunnel is the longest railway tunnel in Zhejiang Province. It starts with Xikou Town, Fenghua City, Ningbo, Zhejiang Province. The site area of ​​the tunnel is to erode the low mountainous areas, the mountains are steep, and the flowing water erosion and cutting fiercely. Crossing the 7 -free layer belt, the 5 -festival -intensive belt, and 2 rocky contact bands. It is the control of the Golden -Emperor Railway.

The Jinye Railway is an important node project in the economic development of the country's "Belt and Road". It is about 188.3 kilometers in length. The operating speed is 160 kilometers per hour, and 200 kilometers are reserved.

Refresh the dwelling length record of the domestic mining method tunnel construction

The Qianshi Rock Tunnel has many classifications, and the construction method has been changed frequently. After preliminary construction planning, the use of mining method construction from the Lishu Bay slope to excavation can effectively ensure the construction period.

"The length of the Qianshiyan Tunnel is 4,524 meters, which refreshes the longest record of the domestic mining method tunnel construction." Yu Wei, manager of the Jinye Railway Project Department, said. The longer the distance of the excavation, the worse the construction environment of the tunnel. In order to improve the operating environment and improve the operating efficiency, the project department uses a three -level relay of the axis fans to set up a firing fan to accelerate air convection to meet the ventilation needs. By adding transformers and gas storage tanks, optimizing the size of the duct, the problem of difficulty in conveying the air -cutting machine.

The line is long and deep

Highland temperature and Yongshui into tunnel construction "blocking"

The maximum buried depth of 1,4684 meters with a total length of 14684 meters reached 742 meters, and the temperature section of the high ground in the tunnel was 5100 meters long.

Affected by high ground temperature, the operating surface temperature is up to 41 degrees Celsius. In order to prevent workers' heat stroke, the project department further optimizes the ventilation plan and adds fog guns to cool down. On average, transport 5 tons of ice cubes to the work surface every day. Concentrated personnel areas to further improve the cooling effect.

The tunnel crosses 5 rich water festivals dense bands. The maximum water volume of a single day can reach 44,164 cubic meters, and the Caojiadi Landdi well and the small mileage of the 1,860 -meter -long 1,370 meters belong to the anti -slope area, and the drainage is very difficult.

Due to the 3230 meters long period of the drainage section of the anti -slope, the water continuously flows to the front -end working surface. The project department has 7 anti -slope drainage relay stations and 3 drainage pipe roads to meet the on -site construction requirements and complete the drainage task for 736 days in a row.

Cross the 7 -processed layer of the broken zone, 2 rocky contact bands

The rock explosion is like an irregular bomb

The Qianshi Rock Tunnel crosses the crushing zone of the 7 -proof layer, two rock -in contact bands, and the rock explosion is 7,180 meters long. Geographical stress concentrated release, rock explosion may occur at any time, and the risk factor of construction is high.

To this end, the project department adopts the blasting process of "short -footing, multi -cycle" during excavation, reducing the amount of dosage and blasting, reducing the disturbance of the surrounding rocks, and spraying high -pressure water on the palm surface and cave walls in time after blasting. , Cooling dust removal, wet rock surface, and improving the plasticity of surrounding rocks. The project department encrypts the layout of the observation point in the tunnel to make a timely prediction of advanced geological forecasts, and the situation of the surrounding rocks in front of the front side is to minimize the harm of the rock explosion to the operator, which effectively guarantees the safety of construction.

It is reported that the Golden -Emperor Railway is an important engineering project that implements the national strategy of integrated the development of the Yangtze River Delta and improves the layout of the regional railway network. After the completion, the interconnection of the world's small commodity capital (Yiwu) and the world's largest port (Ningbo Zhoushan Port) will be connected to the Shanghai -Kunming high -speed rail to open the large channel west of Ningbo to the west to promote the Ningbo area and Zhejiang Province faster Integrating the "Belt and Road" is of great significance to promote economic and social development along the line.

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