Anchor Rod-Steel Frame Joint Yield Initial Support Structure and Construction Method

Abstract

The invention discloses an anchor rod-steel frame integrated yielding primary support structure and a construction method thereof, and belongs to the field of tunneling. The anchor rod-steel frame integrated yielding primary support structure comprises a steel arch frame, a buckling energy-dissipating structure, a yielding anchor rod and a force conversion rod, wherein the steel arch frame consists of two arc-shaped arch sections or more; every two adjacent arc-shaped arch sections are connected through a web connecting plate and a lower wing edge connecting plate; the buckling energy-dissipating structure is welded on the outer edge of the steel arch frame; the yielding anchor rod is arranged on a joint of every two adjacent two steel arch frames; one end of a force transmitting rod is connected with a tray on the yielding anchor rod, and the other end of the force transmitting rod is connected with the force conversion rod; and the other end of the force conversion rod is hinged in acavity formed by two webs of the steel arch frame through high-strength bolts. In a yielding process, radial force, on the support structure, of surrounding rocks is converted into circumference force, so that structural stress is more reasonable, and cooperative deformation of the surrounding rocks and the support structure is realized; and the problems that a current tunnel primary support system is twisted and deformed, and even damaged under action of high crustal stress, and the like are solved, and the deformation and damages of the surrounding rocks are effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering support, and in particular relates to an anchor rod-steel frame joint yielding initial support structure, which is especially suitable for the initial support of underground tunnels under high ground stress conditions. Background technique [0002] With the development of transportation projects in our country, there are more and more various deep buried and underground excavation projects, such as highways, high-speed railway tunnels and large hydraulic tunnels. Especially after entering mountainous areas, such projects often face special geological conditions such as high ground stress and weak surrounding rock. After excavation, the stress balance state of the surrounding rock is destroyed, resulting in large deformation. This deformation is usually unstoppable, so , This type of project will encounter problems such as large deformation of surrounding rock and difficult support. In ...

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Problems solved by technology

However, when the yield of these two types of allowable support structures reaches the upper limit of the design yield, the anchor rods are prone to breakage and the steel frame is prone to twisting damage, and the above-mentioned telescopic steel frame is under pressure during the whole support process. Large bending moment, the force is not the most reasonable

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