A Foot-Locking Technology for Large Deformation Tunnel Steel Frame in Soft Rock

Abstract

The invention relates to the technical field of tunnel support, in particular to a foot-locking process for a large-deformation tunnel steel frame in soft rock. In order to strengthen the reliability of the connection between the anchor pipe of the locking foot and the steel frame, and avoid the failure of the locking foot of the steel frame. The technical solution adopted by the present invention includes the following steps: step 1): steel frame selection: select the circular steel pipe concrete steel frame as the steel frame selection for soft rock large deformation tunnel; step 2): processing and production: according to the lock foot anchor pipe Design the drilling angle, design outer diameter and installation position corresponding to the circular steel tube concrete steel frame, drill reserved holes in the corresponding positions of the circular steel tube concrete steel frame, require the size and position of the reserved holes to be accurate, and lock them on the processing site. Trial installation of the foot anchor pipe to ensure that it can be installed successfully; Step 3): At the tunnel construction site, after the circular steel pipe concrete steel frame is erected or extended, and falls to the bottom, the steel frame locking feet shall be implemented in time.

Description

1. Technical field:

[0001] The invention relates to the technical field of tunnel support, in particular to a foot-locking process for a large-deformation tunnel steel frame in soft rock. 2. Background technology:

[0002] Steel frames can play an important role in maintaining the initial stability of tunnels in weak and broken ground after excavation. Whether the shaped steel frame can carry the load effectively depends to a large extent on whether its arch feet are stable. In order to ensure the stability of the foundation of the steel frame arch foot and the stability of the steel frame during the process of lengthening and landing, certain steel frame locking measures must be taken. At present, the locking foot anchor tube has developed into an indispensable steel frame locking foot measure and is widely used, but there are still the following problems in the process of steel frame locking foot: the steel frame and the locking foot anchor tube cannot However, no matter...

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