Apparatus for controlling laneway bottom heave

Abstract

The invention relates to a device for controlling floor bulging of a roadway, which comprises a roadway floor, rock bolts on two sides of the roadway, a tray for the rock bolts, a steel band (1) and a steel band (2) with teeth and holes, and a constant force clamp device. The steel band (1), the steel band (2) and the constant force clamp device form a floor beam together. When the floor bulges of the roadway due to various factors, the floor provides an upward acting force for the floor beam, and the steel band (1) and the steel band (2) with the teeth and holes are subjected to a tensile force under the fixation of the roadway side and the base angle rock bolts. Under the action of the constant force clamp device, friction force with certain size is produced between the steel band (1) and the steel band (2). When the tensile force received by the steel bands is larger than the maximum friction force between the steel band (1) and the steel band (2), two tooth sockets at the overlapped position are dislocated to improve the length of the floor beam; when the tensile force received by the steel bands is smaller than the maximum friction force between the steel band (1) and the steel band (2), the device is in a temporary stable status. For continuous floor bulging, the device repeats the process and the dislocation of the tooth sockets between the steel band (1) and the steel band (2) improves the length of the floor beam to provide certain supporting resistance for the floor. The device applies basically constant supporting resistance to the roadway floor all the time to reduce the floor bulging amount of the roadway and have the function of reducing the overall deformation amount of the roadway.

Description

technical field

[0001] The invention relates to a device for roadway undercut, which can be used for the prevention and treatment of underground roadway undercut caused by various factors, and is also suitable for controlling underground space in water conservancy, civil air defense and other projects. Background technique

[0002] With the increase of coal mine mining depth, some mine roadways present significant plastic deformation and failure characteristics of large deformation, large ground pressure, and difficult support. Many roadway roof and floor strata show soft rock characteristics, which often lead to serious roadway bottoming and increase roadway damage. Convergence rate. Field surveys show that in deep roadways with unsupported floors, 2 / 3 to 3 / 4 of the approach of the roof and floor is caused by the bottom sill, and the roadway maintenance caused by the bottom slab accounts for about 50% of the total maintenance. Generally speaking, there are two methods of f...

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