tunneling construction of dabaoshan tunnel in mawu
时间：2021/3/30 15:48:13 浏览：100次
on march 15, the construction site of the mawu xizhai expressway project of the southern company fired firecrackers in unison. the owners, supervisors and other key leaders of the project and all the participants of the project gathered together to celebrate the smooth construction of the dabaoshan tunnel into the tunnel. the mawu xizhai expressway project is located in min county, gansu province. it is designed with a speed of 80 kilometre per hour per hour. the company is responsible for the construction of the second bid section. the second bid section is 5.17 km long, including 1 dabaoshan tunnel, 3 main line bridges (including 1 extra bridge) and 1 overpass. dapo mountain tunnel is 2.70 km long, accounting for about 52% of the total length of the line. the highest elevation of the mountain is 2642.3 m, the entrance elevation is 2379-2385 m, and the exit elevation is 2424-2430 m. it is difficult to collect and dismantle the medicine cultivated land at the entrance of the tunnel because of its complicated geographical position, and it is difficult to transport the material because the exit of the tunnel is located at the side of the dangerous rock area. meteorological conditions, the winter maximum snow depth of 14 cm, frozen soil depth of 70 cm, unfavorable to construction, is a difficult to bite the "hard bone. ". in the face of many difficulties, the project department has overcome the influence of extremely low temperature, poured the pipe and shed arch at the tunnel entrance with good quality and quantity, and carried on the maintenance continuously. after many tests and tests, the quality of the pipe-shed arch accords with the construction requirements, which opens the way for the dapo mountain tunnel construction. on the other hand, the organization of two teams of people to quickly carry out the construction of the road levy and demolition and construction work, successfully opened the tunnel construction "lifeline. ". in order to ensure safe entry into the tunnel, the project department repeatedly conducted technical demonstration, carefully studied the tunnel construction process and procedures, and earnestly carried out "three-level" safety education, and organize the related personnel to carry on the thorough study to the tunnel standardization construction and the tunnel boring machine technology and so on, ensures the technical support and the safety control two-pronged. the smooth entry of the dapo mountain tunnel marks the start of the project construction. the project department will gradually roll out the operation surface and strive to be the "vanguard" and continue to lead the project construction.