Frictional-energy-consumption-longitudinal-beam-based hybrid spraying-steel frame overall avoidance changing initial-supporting structure and construction method thereof

Abstract

The invention discloses a frictional-energy-consumption-longitudinal-beam-based hybrid spraying-steel frame overall avoidance changing initial-supporting structure and a construction method thereof. The structure comprises a steel frame, a frictional energy consumption longitudinal beam, a sprayed concrete, reinforcing meshes, longitudinal threaded steel bars, and circumferential threaded steel bars. The steel frame is formed by bold bending of profile steels. The frictional energy consumption longitudinal beam mainly includes an upper support member and a lower support member that are made ofchannel steels; and energy is consumed by the friction effect between flanges of the upper support member and the lower support member. And the longitudinal threaded steel bars and the circumferential threaded steel bars are added in the sprayed concrete between two steel frame units. While coordinated deformation of the initial support of the tunnel and the surrounding rock, the frictional energy consumption longitudinal beam enables the initial support to have the certain pressing-resistant and shearing-resistant performances; with the longitudinal steel bars and circumferential steel barsand longitudinal arrangement of the frictional energy consumption longitudinal beam, the joint deformation capability of the tunnel steel frame and the initial supporting structure formed by the sprayed concrete between the steel frames is strengthened, so that the structure damage caused by deformation incompatibility of the steel frame and the sprayed concrete is avoided and thus a coupling effect of the harness with softness is realized.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering support, and in particular relates to a spray-mixed-steel frame integral change initial support structure and construction method based on frictional energy-dissipating longitudinal beams, which is an overall change of the stress mode of the existing tunnel initial support structure , which is suitable for the control of large deformation disasters in the initial support of tunnel engineering. Background technique [0002] In order to solve the problem of unbalanced and insufficient development in the eastern and western regions of our country, the construction of infrastructure such as transportation and water conservancy is gradually inclined to the west. The construction of industrial tunnels is in a period of rapid development. Because the western region is located in the collision zone of the continental plate, the lithology of the surrounding rock is variable, the rock mass is ...

AI Technical Summary

Problems solved by technology

Therefore, during the application process, the joint structure cannot be co-deformed together with the shotcrete under the condition of large vertical and radial deformations. It often shows that the steel frame and the shotcrete are separated, and even the shotcrete limits the shrinkable steel structure. frame movement, or the joints are sprayed with concrete causing the slideable joints to lose their sliding function without paying attention to the protection of the joints

It can be seen that only the joints of the steel frame can slide, and the mechanism of the joint deformation of the concrete between the steel frame and the steel frame cannot be formed, resulting in the inability of the telescopic steel frame to play its role

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