New progress in the construction of Mujia high speed railway
Harbin, Nov. 14, people's daily. With the last blast, laopinggang tunnel of No. 7 section of Mujia railway was successfully connected. It has laid a solid foundation for the subsequent girder erection and track laying, and made new progress in the construction of Mujia high-speed railway According to
, the laopinggang tunnel constructed by Shanghai Engineering Bureau of China Railway is located in Qifeng forest farm, Huanan County, Jiamusi City, Heilongjiang Province, with a total length of 1569m and a maximum buried depth of 98m. It is designed as a single hole double line tunnel. The tunnel is located in the alpine area of Northeast China. The maximum freezing depth of soil is 2.4m, the geological conditions are complex, the surrounding rock is relatively broken and the water content is large, which brings great challenges to the construction
since the tunnel entered into the main tunnel construction on April 8, 2018, the project department has reasonably optimized the construction organization design, planned various construction measures in advance, and adopted a variety of modern large-scale tooling to ensure that the tunnel construction quality meets the requirements of the fine works of the construction unit in view of the complex geology, high-quality construction process requirements and unusually tight construction period. In the construction process, the three step temporary inverted arch method, the three step method and the step method are the main construction methods, strictly adhere to the principle of "pipe over front, short footage, weak disturbance, strong support, fast closure and frequent measurement", and strictly control the process in the process to ensure that each process meets the design and specification requirements
in view of the great construction risk, the project department implements the leadership guarantee system and night inspection system, and the project department and branch level leaders conduct the work in key processes. Through the management and control of key processes such as arch frame installation, initial support and shotcreting, excavation size, and concrete pouring, the quality and safety of the tunnel are met, and the smooth connection of the tunnel is effectively guaranteed
up to now, four tunnels in the section of section 7 of Mujia railway of Shanghai Railway Engineering Bureau of China Railway have been through three, and 4398.9 meters of tunnel excavation has been completed, accounting for 96% of the total tunnel design. Pier body construction and subgrade filling have been completed in the section, and other work such as beam making and beam erecting is being accelerated. (Wang Xiaotao, Zhai Shenghui)