CN-224215992-U - Coal mine tunnel coal rock loose coil width measuring device

Abstract

The utility model discloses a coal rock loose coil width measuring device for a coal mine tunnel, which relates to the technical field of coal mine tunnel surrounding rock stability monitoring and comprises an air bag, a measuring rod and a limiting mechanism, wherein one end of the measuring rod is connected with the air bag, scales are arranged on the measuring rod, the limiting mechanism comprises a limiting tray, a through limiting hole is arranged in the center of the limiting tray, an inclined drill hole is formed in the tunnel side of the tunnel, water is injected into the drill hole, one end of the measuring rod connected with the air bag extends into the drill hole, the air bag floats on the water surface, the other end of the measuring rod extends out of the limiting hole in the limiting tray, the limiting tray is fixed on the tunnel side and is positioned at an orifice of the drill hole, so that the inclination angle of the measuring rod is parallel to the drill hole, and the quantitative measurement of the loose coil width is realized through the linkage relation between the water surface height displacement caused by water injection leakage and the air bag displacement.

Inventors

• ZHAO QIAN
• QIU PENGQI
• MA PING
• Gao Jingyong
• LIU JING
• WU ZIYUE
• DING GUOLI
• WANG WENWEI
• ZHANG JIANWEI
• LI WENBO
• SU SHIJIE
• LIU YUN
• WU YONGHUI

Assignees

• 中天合创能源有限责任公司

Dates

Publication Date

20260508

Application Date

20250509

Claims (8)

1. 1. The coal rock loosening ring width measuring device for the coal mine tunnel is characterized by comprising an air bag (1), a measuring rod (2) and a limiting mechanism, wherein one end of the measuring rod (2) is connected with the air bag (1), scales are arranged on the measuring rod (2), the limiting mechanism comprises a limiting tray (3), a through limiting hole (5) is formed in the center of the limiting tray (3), an inclined drilling hole (8) is formed in the tunnel side of the tunnel, water is filled in the drilling hole (8), one end of the measuring rod (2) connected with the air bag (1) stretches into the drilling hole (8) to enable the air bag (1) to float on the water surface, the other end of the measuring rod (2) stretches out from the limiting hole (5) in the limiting tray (3), and the limiting tray (3) is fixed on the tunnel side and located at an orifice of the drilling hole (8) to enable the inclination angle of the measuring rod (2) to be parallel to the drilling hole (8).
2. 2. The device for measuring the width of the coal rock loosening ring of the coal mine tunnel according to claim 1 is characterized in that the air bag (1) is of a double-layer structure and is divided into an inner layer and an outer layer, the inner layer is a buoyancy air bag, and the outer layer of the air bag (1) is a wear-resistant rubber protection layer.
3. 3. The device for measuring the width of the coal rock loosening ring of the coal mine tunnel according to claim 2, wherein helium is filled in the buoyancy air bag.
4. 4. The device for measuring the width of the coal rock loosening ring of the coal mine tunnel according to claim 1 is characterized in that the top of the air bag (1) is connected with a universal joint through the universal joint and is connected with the measuring rod (2).
5. 5. The device for measuring the width of the coal rock loosening ring of the coal mine tunnel according to claim 1, wherein the measuring rod (2) is made of carbon fiber.
6. 6. The device for measuring the width of the coal rock loosening ring of the coal mine tunnel according to claim 1 is characterized in that the limiting tray (3) is of a circular plate-shaped structure, two handles (4) are symmetrically arranged on the limiting tray (3), and the limiting hole (5) is located in the middle of the two handles (4).
7. 7. The device for measuring the width of the coal rock loosening ring of the coal mine tunnel according to claim 1, wherein a fluorescent scale and a reflective annular mark are arranged on the surface of a rod body of the measuring rod (2).
8. 8. The device for measuring the width of the coal rock loosening ring of the coal mine tunnel according to claim 1, wherein the center of the limiting hole (5) corresponds to the center of the drilling hole (8).

Description

Coal mine tunnel coal rock loose coil width measuring device Technical Field The utility model belongs to the technical field of monitoring of stability of surrounding rocks of coal mine roadways, and particularly relates to a measuring device for a width of a loose coil of coal rocks of a coal mine roadway. Background In the coal mining work, surrounding rock deformation and loosening can be generated after a roadway is tunneled, and a surrounding rock loosening ring is a key parameter of support design. In recent years, a plurality of theoretical results on calculation of the loose circle range of the surrounding rock appear at home and abroad, but the calculation result has larger limitation because of more practical complex factors of engineering. The loose circle test of the roadway surrounding rock is an important technical means for checking the stability of the roadway surrounding rock, the loose circle range is an important representation of the integrity of the surrounding rock after the roadway tunneling is completed, and the loose circle test is an important basis for determining roadway support parameters. After the tunnel is excavated, the stress of the original rock is redistributed, a stress unloading area and a stress concentration area are formed on the rock mass around the tunnel, a circular-like annular crushing belt is formed in the rock mass around the tunnel under the action of concentrated stress, namely a loosening ring is formed, and if the support is not timely carried out, the risk of roof caving of two sides and a roof occurs. The range of the loosening ring is closely related to lithology and ground stress level of a coal rock stratum where a roadway is located, the higher the intensity of a coal rock mass is, the lower the ground stress level is, the concentrated stress of surrounding rock masses is lower, the lower the concentrated stress is, the lower the intensity of the surrounding rock mass is, and the lower the loosening ring is. In the related art, the methods for testing the range of the loose coil mainly comprise an acoustic wave method, a geological radar method, a seismic wave method, a multi-point displacement meter method, a drilling peeping method and the like, the former three methods mainly transmit and collect acoustic wave signals of surrounding rock of a roadway through special instruments, such as ultrasonic waves, electromagnetic waves and the like, analyze waveforms and propagation speeds of the acoustic wave signals in different mediums to infer the surrounding rock structure, and have the problems of high testing cost, low measuring precision and the like. The multipoint displacement meter method is characterized in that a multipoint displacement monitoring device is arranged on a roadway top plate and two sides of the roadway top plate to monitor the change of the distance between each measuring point, and the method is influenced by factors such as the precision, the installation quality, the monitoring depth and the like of the multipoint displacement meter, so that the measuring precision is difficult, the testing time is long, and the equipment cannot be recovered. The drill peeping method is to peep the construction drill and analyze the crack development degree of different depths to infer the loose coil range, and mainly relies on the experience of operators to judge, and the measurement result is only a qualitative result and cannot be accurately quantified. The existing field measurement technology has the problems of high equipment cost, complex operation, difficult popularization and the like. Disclosure of utility model The utility model overcomes the defects of the prior art, and provides the device for measuring the width of the coal rock loosening ring of the coal mine tunnel, which realizes quantitative measurement of the width of the loosening ring through the linkage relation between the water surface height displacement and the air bag displacement caused by water injection leakage, has simple structure, low cost and stronger applicability and safety. In order to achieve the above purpose, the utility model is realized by the following technical scheme: The device for measuring the width of the coal rock loosening ring of the coal mine tunnel comprises an air bag, a measuring rod and a limiting mechanism, wherein one end of the measuring rod is connected with the air bag, scales are arranged on the measuring rod, the limiting mechanism comprises a limiting tray, a through limiting hole is formed in the center of the limiting tray, an inclined drill hole is formed in the tunnel wall of the tunnel, water is filled in the drill hole, one end of the measuring rod, which is connected with the air bag, extends into the drill hole to enable the air bag to float on the water surface, the other end of the measuring rod extends out of the limiting hole in the limiting tray, and the limiting tray is fixed on the tunnel wall and located at an or