Multi-stage yielding contracting type steel frame based on constant-resistance sliding hole shearing losses and connection method thereof

Abstract

The invention discloses a multi-stage yielding contracting type steel frame based on constant-resistance sliding hole shearing losses and a connection method thereof. The multi-stage yielding contracting type steel frame comprises a contracting type steel frame unit, an ordinary steel frame unit, a contracting type joint and a common joint. A sliding end of the contracting type steel frame unit isconnected with the ordinary steel frame unit through the contracting type joint; the contracting type steel frame unit can be contracted in the contracting type joint; and the ordinary steel frame unit employs a common joint for connection. According to the invention, the contracting type joint is connected with the steel frame unit firmly and the steel frame has the certain bending-resistant andshearing-resistant performances; a sliding assembly employs a protection cover for protection, so that the influence on the joint by concrete spraying is avoided greatly; with full utilization of themechanical property of the steel product, the profile steel, steel plate, bolt and the like are ordinary materials at a construction site, so that processing becomes convenient and material are simple and easy to use; all assemblies are dismounted conveniently and no construction procedure is increased; welding and slot hole opening are carried out on the contracting type steel frame joint; splicing is carried out in a tunnel; the construction is done simply and conveniently; and the multi-stage yielding contracting type steel frame and the connection method thereof are easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering support, and in particular relates to a multi-stage yielding compressible steel frame based on constant resistance sliding hole shear loss and a connection method. Background technique [0002] With the continuous increase of the construction scale of tunnel projects such as transportation, energy, and water conservancy in my country, large deformation problems are often encountered in tunnel projects passing through soft rock sections with high geostress. Its unique "expansion", "extrusion" and "looseness" make the tunnel diameter shrink, the surrounding rock stress is large, the deformation speed is fast, the convergence and stability time is long, and it even cannot converge, and the deformation is large. During the protection, the supporting structure is subjected to great surrounding rock pressure, which leads to damage. During the construction of the large deformation tunnel, vari...

AI Technical Summary

Problems solved by technology

The steel arch frame of the traditional telescopic steel frame uses steel pipes and U-shaped steel that need to be customized. The snap ring of the shrinkable joint provides sliding resistance through bolt fastening. The initial sliding resistance is related to the torque of the snap ring. After starting to slide, the snap ring may become loose, and the sliding resistance is unstable. The resistance provided by the steel frame is difficult to quantify, and the timing cannot be effectively controlled.

[0005] Therefore, according to the large deformation characteristics of the surrounding rock, the early deformation of the surrounding rock can be reasonably controlled, the pressure of the surrounding rock can be properly released, and the load acting on the structure can be reduced. Difficult to guarantee

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