Over-crossing existing subway tunnel between-pile soil clearing method

Abstract

The invention discloses an over-crossing existing subway tunnel between-pile soil clearing method. The over-crossing existing subway tunnel between-pile soil clearing method comprises the following steps of: firstly, arranging an shock absorbing elastic support between two adjacent isolating piles; vertically arranging a plurality of pre-cracking drill holes surrounding each isolating pile; dividing the between-pile soil surrounding each isolating pile into a stable region and an unstable region; finally carrying out layered excavation on the between-pile soil in the unstable region by adopting machinery; and carrying out layered excavation on the between-pile soil in the stable region by adopting manpower. By utilizing vibration wave transmission theory and arranging the shock absorbing elastic support, the over-crossing existing subway tunnel between-pile soil clearing method disclosed by the invention realizes effective absorption of disturbance and vibration generated in excavation, reduces the disturbance to the isolating piles, damages the integrity of the between-pile soil by forming the pre-cracking drill holes surrounding the isolating piles so that the between-pile soil in the stable region can be conveniently removed in an excavation way and partial vibration wave generated in excavation in the unstable region is effectively absorbed, greatly reduces the disturbanceto the isolating piles and over-crossing existing tunnel surrounding rock in an excavation process by adopting machinery and manpower in combination with excavation, realizes high safety and simple operation, and spends a short time.

Description

technical field [0001] The invention belongs to the technical field of subway construction, and in particular relates to a method for cleaning the soil between piles of an existing subway tunnel with an upper span. Background technique [0002] At present, with the continuous development of the city, there are a large number of vehicles and population in the city. This series of problems makes the city have to build an underground transportation system to relieve the pressure of ground transportation. Line crossing and transfer often occur in subway construction, which requires attention must be paid to the protection of existing tunnels and reduce disturbances to them when carrying out subway construction above existing subway tunnels. When building transfer passages above existing subway tunnels, the soil layer of the existing tunnel vault is often reinforced by driving isolation piles, and then the part of the isolation piles exposed to the transfer passage is removed, an...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the technical problems existing in the prior art, the present invention provides a method for cleaning the soil between the piles of the existing subway tunnel on the upper span, so as to solve the problems of manual cleaning in the prior art, low work efficiency, high construction cost, and direct mechanical cleaning. During the excavation and cleaning process, it is very easy to cause disturbance to the isolation piles, which is a technical problem that is very dangerous to the existing subway tunnels

Images