On January 8, the construction of shitouzhai tunnel lining project of yumo railway project of China railway 21st bureau 4 company was completed successfully, which is another important construction node completed ahead of schedule after shitouzhai tunnel was successfully completed 117 days ahead of schedule.
Shitouzhai tunnel, with a total length of 11,842 meters, is one of the key control projects of yumo railway. The yumo railway project department of China railway no.24 company of the 21st bureau is responsible for the construction task of 4,851 meters of vertical hole exit - horizontal hole -3 inclined shaft. The tunnel to Ⅱ risky tunnel, complex geological structure, rock crushing, hole temperature is higher, the traffic is very inconvenient, construction difficulty is great, time limit for a project task.

In the tunnel construction, the project department always adhere to the ldquo; Invert as the center ” The concept of tunnel construction and the management of strong grasping step ensure the smooth progress of tunnel lining project. In the process of invert construction, ldquo is adopted. Invert double trestle ” The construction technology speeds up the progress of invert construction and guarantees the quality of invert construction. In the second lining construction process, adhere to the “ Three by two hole two vibration ” Concrete pouring process, adding “ Second lining dome cavity alarm ” , adhere to the injection with mold, to ensure the construction quality of the second lining.

Project department through careful organization, strict construction, has overcome the hole in high temperature and bad working environment, raw materials nervous, big construction disturbance, and a series of difficulties, created the inverted arch single month fastest construction of 120 meters, the second fastest lining single monthly construction of 144 meters, constraints to ensure that the tunnel construction and lining project of synchronized advancement, has realized the Shi Touzhai tunnel lining project completed ahead of time, also for the whole tunnel subsequent frantic jumble track construction have laid a solid foundation. (cao qiang wang Yang)