The first double track long tunnel in Guangdong section of Jiangxi Shenzhen high speed railway is fully connected

At 10 a.m. on January 6, the Yihe tunnel project of the first double track long and large tunnel in Guangdong section of Jiangxi Shenzhen high speed railway, a national key construction project of the 13th five year plan undertaken by China Railway 16th Bureau Group, was fully completed, creating good conditions for completion and opening to traffic in 2021.

it is reported that Yihe tunnel constructed by China Railway 16th Bureau Group Co., Ltd. is the first 6-kilometer long double track tunnel in Guangdong section of Jiangxi Shenzhen high speed railway. The tunnel project is located in the high mountains of Dongyuan County, Heyuan City, Guangdong Province, with a total length of 6043 double track meters. The construction started on May 1, 2017. It is a key and difficult control "throat" project of the eight bridges and eight tunnels of the ganshen high speed railway line ”. The stability of the surrounding rock of the whole tunnel is very poor, from completely weathered to weakly weathered granite, with complex geology, local fault fracture zone, rich groundwater, water and mud inrush and other risks. The tunnel body passes through 8 major fault zones and the rock layers are repeatedly staggered. The shallowest buried depth is only 5 meters. The surrounding rock development is unbalanced, the geological changes are large, the construction risk is difficult, and the technical requirements are high, which brings a series of major difficulties to the engineering construction. Li Ming, director of the 1st bid section of ganshen high speed railway of the 16th Bureau of China Railway
, said: "since the beginning of the construction, all the staff in our headquarters have given full play to their subjective initiative, and actively practiced the core concept of the 16th Bureau that responsibility is more than ability and will to create miracles. According to the requirements of the" six in one "of quality, safety, construction period, investment, environmental protection and innovation, we have pushed forward it in depth Standardized process management and control, strengthened environmental protection measures, adhered to the principle of tooling technology and process quality, successively adopted advanced tooling equipment such as three arm rock drilling jumbo, self-propelled hydraulic inverted arch trestle, semi-automatic cloth hanging jumbo, wet spraying manipulator, ditch cable trough jumbo, etc., and realized the secondary lining window into the mold technology, arch roof with mold grouting technology, inverted arch rapid construction Engineering technology, rapid construction technology of ditch and cable trough, hydraulic blasting and other advanced technologies are fully implemented. "

in addition, in the construction of Yihe tunnel, five new technologies have been adopted, including anti-interference mobile layered concrete formwork, one-time pouring of multiple trenches mobile formwork, mobile layered concrete formwork support group, tunnel trench mobile formwork center pouring component, tunnel trench mobile formwork pouring part, which not only obtained the national intellectual property rights The utility model patent issued by the Bureau has also been popularized and applied in the same industry nationwide, and has been highly praised. It ranks first in the "credit evaluation" and "red line" inspection work of the whole line, laying a solid foundation for the tunnel to be fully connected.

it is reported that the Jiangxi Shenzhen high speed railway is the main link of the south section of Beijing Jiulong high speed railway and an important part of China's "eight vertical and eight horizontal" high speed railway network. After the completion and opening to traffic, Guangdong Province will end the last prefecture level city without high speed railway, which is a poverty alleviation road. It is of great significance to promote the poverty alleviation and prosperity of the old revolutionary areas of Guangdong and Jiangxi.