in order to ensure the smooth implementation of the tunnel according to the plan, the construction and construction units have innovated a series of advanced technology under the active promotion of the Municipal Traffic Commission Highway Department. First of all, the advanced tunnel construction technology -- the double wall heading method, is also called the seven step work method. In a simple way, the tunnel cross section is divided into seven blocks, blasting excavation, blasting both sides of the tunnel first, and then carrying out the cement grouting lining support, and then excavating the remaining section according to the geological conditions and the size of the section. Secondly, in order to speed up the progress, the new tunnel excavation method is adopted in the tiger mountain tunnel. Through the excavation of the construction guide in the middle of the right line of the tunnel, two tunnel construction faces are added, which effectively accelerates the tunnel excavation progress and greatly saves the time limit. In order to ensure safety, quality, environmental protection and civilized construction, we should resolutely implement the policy of "safety first, prevention and comprehensive management", and adhere to "short scale, weak blasting, strong support and measurement", and always ensure that construction safety is the first key work. The smooth operation of the right line of the tiger mountain tunnel is the key to the smooth operation of the whole line, indicating that 6 tunnels in the two projects of the East (South) extension line of the second ring are all through the single hole. At present, all 6 tunnel projects are coming to an end. The tunnel excavation has been completed for 17406 meters and the completion rate is 96.8%. Among them, Xiaoling tunnel and long Ding tunnel have been integrated.
the Municipal Transportation Committee will accurately dispatch and organize the highway department. On the premise of ensuring safety and quality, all the participants will be mobilized steadily to promote the construction of the project. It will fully ensure the completion of the remaining tunnel project on schedule and provide guarantee for the smooth traffic of the two projects at the end of the year.