A method for improving the stability of U-shaped steel arch support and connecting components

Abstract

A method for improving the stability of U-shaped steel arch support and a connecting component, which are used in the field of roadway excavation support. The retractable support must rely on the friction of the overlapping section to conduct the support, and the failure of the card to loosen accounts for 50% of the accident rate. According to the principle of mechanics, any roadway section, regardless of whether the shape of the arch frame is closed or not, when the steel section is determined, the longer the connection with the card, the more complete, the lower the critical load, and even the overall strength of the material fails due to local weakness. Steady and crumbling. The new method enhances the critical load and support through comprehensive measures such as local reinforcement with moderately variable cross-section to increase the moment of inertia of the weakest part, effective fractured top-to-top connection at the part with large curvature, and mutual pulling between the supports. overall stability. Based on this method, technology and the internal force characteristics of the arch under pressure, several sets of special connecting components are designed. The new method can reduce support accidents, increase shed spacing, reduce support strength and greatly reduce steel consumption.

Description

[0001] Technical field: The present invention relates to a method for connecting and reinforcing U-shaped steel brackets for roadway excavation support and its connecting components. Background technique [0002] In coal mines, tunnels, mines and all kinds of underground engineering construction roadway tunneling support, U-shaped steel support is used, although the steel consumption is huge and the cost rises, but because the construction is simple and fast, and the U-shaped steel parts can be recycled and reused, it is still Tons of applications. Considering the underground environment and the convenience of manpower construction, in the application of the existing support technology, considering the convenience of transportation, the U-shaped steel is generally bent into a multi-section (such as three sections) arch, and each section is divided into sections at the construction site. U, U overlap, overlap and overlap. There is a certain length of overlapping section in the...

AI Technical Summary

Problems solved by technology

For the case of a large section of the roadway, the arch frame, that is, the "curved beam" is generally connected longer, which often makes the critical stress far lower than the allowable stress of the steel strength, so that the lack of stability leads to support failure.

In order to overcome this phenomenon, enterprises usually take measures to reduce shed spacing and increase support strength, which in turn increases steel consumption and support costs dramatically.

Images