Testing method for laying ballastless tracks in early stage before overall completion of super long tunnel

Abstract

The invention relates to a testing method for laying ballastless tracks in the early stage before overall completion of a super long tunnel. In the traditional tunnel construction method, a tunnel is dug in two directions both from the left cave and the right cave; and tracks are laid after the tunnel is finished; and the traditional construction method has the disadvantages of low construction progress, long construction period, low efficiency and risks of potential safety hazards. In the invention, multiple inclined shafts are arranged along the direction of a main cave; with the inclined shafts as a boundaries, the main cave construction is carried out in two directions by sections and the ballastless tracks are laid before the cave is dug through; a horizontal control network and a vertical control network are established to carry out measurement and data acquisition, the mathematical model of curve fitting is used to carry out centerline fitting so as to confirm the deviation between a through centerline and a theoretical centerline and carry out assessment to determine theoretical position of the centerline of sections dug through latterly; tracks of the through sections arelaid according to the fitted centerline, the sections under construction are measured and guided according to the fitted centerline to ensure that the centerline of the sections dug through latterly is consistent to the centerline of the sections with tracks laid. The method greatly accelerates construction progress and ensures smoothness and collinearity of the tracks laid in the early stage.

Description

technical field [0001] The invention relates to a method for laying a ballastless track in advance before the overall penetration of an extra-long tunnel. Background technique [0002] In the construction of railway projects, the method often used in tunnel construction is the drill and blast method. A professional mechanized construction team is arranged at the entrance and exit of the tunnel to complete the excavation of the entrance and the construction of the entrance to carry out two-way excavation of the tunnel. After the tunnel is completely penetrated and the penetration error is adjusted, the construction of the ballastless track for all sections of the tunnel will start, and the construction of other facilities in the tunnel will start. For longer tunnels or even extra-long tunnels, such a construction plan and construction arrangement have slow construction progress, long construction period, low work efficiency, and the construction location is far away from the ...

AI Technical Summary

Problems solved by technology

If the ballastless track is laid according to the construction center line of the already penetrated section, it will not be able to connect smoothly with the ballastless track laid in the next section, or even cannot be adjusted at all, which may cause project correction, rework, or even abandonment, resulting in waste and delays in the construction period

Therefore, it is difficult and risky to implement the laying of ballastless track in advance before the entire tunnel is completed.

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