Method for synchronously constructing pilot tunnel excavation and mid-partition wall lining in double-arch tunnel

Abstract

The invention discloses a method for synchronously constructing pilot tunnel excavation and mid-partition wall lining in a double-arch tunnel. The method includes the steps that step (1) double-arch tunnel underground excavation construction enters a C ramp from an inclined shaft to an open excavation section bifurcation part, downwards penetrates through a deep foundation pit open excavation section to the end part of a double-arch tunnel section through a 5# channel, and additionally opens a 2# transverse channel, and according to the principle from near to far and from top to bottom, 2# transverse channel excavation and double-arch underground excavation tunnel entering construction are sequentially conducted in a stepped and sub-pilot tunnel mode; step (2) the double-arch tunnel excavation is conducted in sequence according to the principle from near to far and from a high place to a low place; step (3) a double-arch 1# tunnel is used as a main transportation channel for advanced construction, a 3-1 transverse channel is excavated obliquely downwards into a double-arch 0# tunnel, a tunnel section mid-partition wall is constructed, and then a double-arch 3# tunnel is excavated;and step (4) the double-arch 1# tunnel continues to be excavated in advance, a 3-2 transverse channel is excavated, and the double-arch 0# tunnel is excavated. According to the method for synchronously constructing pilot tunnel excavation and mid-partition wall lining in the double-arch tunnel, synchronous construction of main tunnels and middle pilot tunnels in the two sides of the double-arch tunnel is achieved, and the construction period is greatly shortened.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a method for synchronous construction of pilot tunnel excavation and intermediate partition wall lining in a double-arch tunnel. Background technique [0002] With the further development of the coastal areas, the population is getting denser and the cities are congested, especially in the island-type cities, there are only cross-sea bridges for traffic inside and outside the island, the traffic pressure is high, and they are greatly affected by disastrous weather. Therefore, the construction of subsea tunnels inside and outside the island to connect the urban road hubs on the island and the traffic outside the island has obvious advantages in ensuring driving safety, shortening the driving distance, and avoiding disasters. , linear extension, wiring at both ends, and the thickness of the middle rock pillar, etc., it is impossible to achieve a separate or small cleara...

AI Technical Summary

Problems solved by technology

Therefore, the construction of subsea tunnels inside and outside the island to connect the urban road hubs on the island and the traffic outside the island has obvious advantages in ensuring driving safety, shortening the driving distance, and avoiding disasters. , linear extension, wiring at both ends, and the thickness of the middle rock pillar, etc., it is impossible to achieve a separate or small clearance tunnel; in addition, the open-cut method has a great impact on the surrounding environment and traffic. Explosion is a difficult point, and external factors greatly interfere with construction

Images