Circumferential shoe device for small-diameter full-face hard rock tunnel boring machine

Abstract

The invention discloses a circumference boot supporting device for a small diameter full section hard rock tunneler. The circumference boot supporting device for the small diameter full section hard rock tunneler is used for supporting all round of surrounding rock when a shield is tunneling, and is provided with a cylindrical shell. At least six supporting boots which can be extended or retracted from the outer wall of the shell are evenly arranged on the perisporium of the shell. A hydraulic jack corresponding to each supporting boot is mounted in the shell. A connecting rod provided with a force increasing effect is arranged between each support boot and a jack piston rod. Both ends of the connecting rod are hinged with the supporting boot and the jack piston rod in a spherical mode. According to the circumference boot supporting device for the small diameter full section hard rock tunneler, a plurality of the supporting boots are arranged on the shell in the circumference direction, the number of the supporting boots is increased, and the force between the supporting boots and the surrounding rock is uniformly dispersed based on reducing the size of the system structure, the total contact area is large and the stability is improved. Each assembly unit is hinged with each other in a spherical mode, the unbalance load effect is small, the jack is not prone to losing stability. By adoption of a connecting rod force increasing mechanism, the pressure between the supporting boots and the surrounding rock is increased, and the goal of improving the frictional resistance of the tunneler and the drivage efficiency is achieved.

Description

technical field [0001] The invention relates to a circumferential support shoe device for a small-diameter full-section hard rock tunnel boring machine applied to a coal mine roadway. Background technique [0002] At present, hard rock tunnel boring machine (TBM) has been widely used in water conservancy and hydropower, transportation, municipal and other projects. The hard rock tunnel boring machine involved has a large diameter, generally more than 5 meters in diameter; Basically, the traditional drilling and blasting method is still used for construction, which has low construction efficiency, high labor intensity and high risk. Therefore, coal mine roadways are required to have a small diameter, generally less than 3 meters, in consideration of economy, efficiency, safety, and the downhole and transition of hard rock roadheaders. Since a strong propulsion force is required to ensure the normal advancement of the hard rock tunnel boring machine, the traditional method is...

AI Technical Summary

Problems solved by technology

Since a strong propulsion force is required to ensure the normal advancement of the hard rock tunnel boring machine, the traditional method is to provide frictional resistance on the surrounding rock through two horizontally symmetrical support shoes, but this structure has the following defects: first, the external dimensions Large, it is almost impossible to realize in the roadheader with a diameter of less than 4.5 meters (the friction resistance provided is difficult to meet the propulsion requirements during excavation), and at the same time limited by the size of the downhole cage, it needs to be transferred and installed in blocks; secondly, the area of ​​a single support shoe is large, Due to uneven force, the surface of the shoe is prone to deformation and damage; finally, the jack of the shoe is subject to a large unbalanced load and is prone to instability

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