Red Net Moment News on December 21On December 20, with the completion of the excavation of the last step of the left hole, it marked the smooth breakthrough of the double tunnel of the Paishan Chong Tunnel, one of the key control projects of the Lilou Expressway. This is also the first tunnel with two holes on the whole line of Lilou Expressway.
The tunnel is located in Xi'an Village, Sunjiawan Town, Liling City, Zhuzhou City, using two-way six-lane highway standard construction, is a separate small clear distance tunnel, the entrance and exit of the door are all end-wall, the left hole is 1440 meters long, the right hole is 1485 meters long. The tunnel site area and V-grade surrounding rock account for 90%, and the tunnel entrance section passes through the gas section and the fault fracture zone.
In order to complete the objectives and tasks of the tunnel project quickly and well, the project department strictly implements the principle of "pipe advancement, strict grouting, short footage, weak blasting, and strong support", applies the "four new technologies" such as access control system and data intelligent acquisition system, continuously optimizes the construction plan and process flow, adopts the double-side wall guide pit method and step method to enter the tunnel, dynamically adjusts the construction parameters, strengthens the control of all indicators in the whole construction process, and ensures that the safety, quality and progress of the tunnel project reach the construction goal of "three controls and three excellences".
The successful breakthrough of the double tunnels not only provides a successful experience that can be replicated and promoted for the comprehensive improvement of the quality and speed of the whole tunnel project of the project, but also injects strong impetus into the safe and high-quality completion and opening of the project to traffic as scheduled.