Lock foot pile support structure for controlling tunnel initial support settlement convergence

Abstract

The invention discloses a lock foot pile support structure for controlling tunnel initial support settlement convergence. The structure comprises an initial support in the tunnel grotto. A tilted lock foot pile is arranged at the outer wall of the initial support; the lock foot pile comprises a rotary jetting pile body, and the rotary jetting pile body is connected to an L-shaped steel core material. The other end of the L-shaped steel core material is connected with a connecting steel bar. The connecting steel bar is connected to an I beam steel frame of the initial support. The lock foot pile support structure for controlling the tunnel initial support settlement convergence has the advantages that the technical process is simple; the effected interference to the process conversion is less, the operation is convenient; the work efficiency is improved; the problems that the excavations of middle and lower steps cause the arch foot to be vacant, the side wall of the tunnel is unstable or the slippage and the grouting and anchorage effect of lock foot are poor are overcome; the stability of the palm surface, the deformation and settlement of the control cavern and the mechanized construction are achieved.

Description

technical field [0001] The invention belongs to the technical field of design and construction of tunnels and underground engineering in special formations such as silty sand layers with relatively strict settlement control and extremely poor self-stabilizing ability, water-rich saturated soil, or flow-plastic cohesive soil, and the construction risk is extremely high. The invention relates to a support structure of locking piles for controlling the settlement convergence of the primary support of the tunnel. Background technique [0002] Lock foot anchor rod (or lock foot anchor pipe) is a technology developed along with spray anchor support, which is a kind of steel structure erected obliquely at the arch foot of the initial support. After the tunnel is excavated and the steel frame is erected, it is fixed with the steel frame before the concrete is sprayed, and the deformation of the surrounding rock is limited together with the steel frame and the shotcrete. Generally, ...

AI Technical Summary

Problems solved by technology

However, under special geological conditions such as silt and fine sand with extremely poor self-stabilization ability, poor formation grouting effect, large plastic zone of surrounding rock, weak anchoring force, hanging arch feet and surrounding rock collapse at side walls, etc., the locks set The foot anchor (pipe) cannot restrain the ground and support the load from the upper initial support, resulting in excessive settlement and deformation of the initial support, leaving great hidden dangers to the construction

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