Device and method for resisting steel arch settlement of weak surrounding rock tunnel

Abstract

The invention provides a device and a method for resisting steel arch settlement of a weak surrounding rock tunnel. The device at least comprises a plurality of resin anchor rods and a plurality of small guide pipe grouting type anti-sliding anchor rods; a plurality of steel base plates are arranged at the top end of a steel arch in the arch direction, each steel base plate is connected with the first ends of the multiple resin anchor rods, the second ends of the resin anchor rods are used for being inserted into the side wall of the tunnel, and the axes of all the resin anchor rods point to the circle center position of the steel arch; at least two triangular steel base plates are arranged on each of the two sides of the steel arch, and a plurality of connecting holes are formed in each triangular steel base plate; and the small guide pipe grouting type anti-sliding anchor rods are arranged in the tangential direction of the steel arch, one of the ends of the small guide pipe grouting type anti-sliding anchor rods is inserted into the corresponding connecting hole to be connected with the corresponding triangular steel base plate, and the other one of the ends of the small guide pipe grouting type anti-sliding anchor rods is used for being inserted into the side wall of the tunnel. According to the device and the method, the arch top and the arch foot of the steel arch of the tunnel are fixed through the anchor rods in different manners, the work amount is saved to the maximum degree, and the safety coefficient of the tunnel is increased.

Description

technical field [0001] The invention relates to the technical field of steel arch settlement protection in tunnel construction, in particular to a device and method for resisting steel arch settlement in weak surrounding rock tunnels. Background technique [0002] The statements in this section merely provide background art related to the present invention and do not necessarily constitute prior art. [0003] At present, traffic construction shows a development trend from plain hills to heavy hills, and the number of long tunnels under various complex and harsh geological conditions has also increased sharply. In some areas, there are many weak rock formations, which are highly weathered, extremely soft, extremely low in compressive strength, poor in cohesion, and extremely unstable. Especially after artificial disturbance, the rock mineral composition and rock mass integrity will change to varying degrees, and the strength of the tunnel surrounding rock mass will be furthe...

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Problems solved by technology

[0004] However, the inventors found that the excavation method of upper and lower steps has brought another engineering problem, that is, after the upper step is excavated and the steel arch is initially supported, the initial support of the steel arch is affected by the surrounding rock when the lower step is excavated. The pressure has obvious subsidence phenomenon. If it is not controlled, it will cause secondary disturbance to the surrounding rock and further reduce the strength of the surrounding rock, thereby further increasing the pressure of the initial steel arch frame of the tunnel, which will easily lead to deformation of the deeper tunnel surrounding rock, and will Affects the planning of tunnel construction, etc.

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