A device and method for non-destructive monitoring of bolt axial force using acoustic excitation
A monitoring device, a technology of acoustic excitation, applied in the direction of measuring device, force/torque/work measuring instrument, measuring force, etc., can solve the problems of unsuitability for large-scale use, complex structure, difficult maintenance, etc., and achieve easy monitoring and monitoring costs. Low, good operability effect
Inactive Publication Date: 2017-08-22
TAIYUAN UNIV OF TECH
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Problems solved by technology
These devices have a series of problems such as complex structure, high cost, difficult maintenance, and not suitable for large-scale use.
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[0025] figure 1 It shows the installation position of the non-destructive monitoring device for the axial force of the anchor rod in the system: the device of the present invention is installed at the bottom of the anchor rod 6, the monitoring device 4 is set on the outside of the anchor rod 6, and a nut 5 is arranged under the monitoring device 4, and the nut 5 applies the force. A pre-tightening force, the centering pad 3 is connected to the top of the monitoring device 4, the tray 2 is above the centering pad 3, and the tray 2 supports the rock mass 1.
[0026] Such as figure 2 , image 3 As shown, a device for non-destructively monitoring the axial force of a bolt using acoustic excitation includes an upper platen 7, a bearing body 8, a support column 9, a resonant plate 10, and a lower platen 11; the bearing body 8 is a hollow cylinder structure, carrying The body 8 is set on the outside of the anchor rod 6, the carrier body 8 and the supporting column 9 are located in...
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Abstract
The invention discloses a device and method for non-destructively monitoring the axial force of a bolt by using sound excitation, which belongs to the field of mining engineering. The monitoring device includes an upper platen, a carrier, a support column, a resonant plate, and a lower platen; the carrier is a hollow cylindrical structure, and the carrier is set on the outside of the anchor rod, and the carrier and the support column are located in the middle of the upper platen and the lower platen. The pressing plate is arranged vertically, four supporting columns are arranged on the four corners of the square pressing plate respectively, four resonant plates are arranged around the device, the upper and lower pressing plates are of the same size and size, and the lower pressing plate is provided with holes. Use this device to monitor the axial force of the bolt, and distinguish the force on the bolt by listening to the size and frequency of the sound. The method is simple, easy to operate, easy to monitor, low in monitoring cost, and the monitoring accuracy meets the requirements, which is suitable for engineering practice. application.
Description
technical field [0001] The invention relates to a device and method for non-destructively monitoring the axial force of a bolt by acoustic excitation, belonging to the field of mining engineering. Background technique [0002] As the main method of rock and soil anchoring and support technology, bolt support is widely used in water conservancy, hydropower, transportation, railway, mine, urban infrastructure and other engineering constructions. The extensive use of bolts in the engineering field sometimes causes the bolts to fail and break due to loosening of the rock and soil or changes in the stress state of the bolt itself. In order to ensure the safety of personnel and property, timely and accurate inspection of the bolts It is very necessary to monitor the stress state. [0003] Relevant personnel at home and abroad have done a lot of research on bolt monitoring. Chinese patent CN101576422A discloses a fiber grating bolt stress sensor, and Chinese patent CN2687643Y disc...
Claims
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IPC IPC(8): G01L1/25G01L5/00
Inventor 梁义维赵利平尹啟瑞窦传浩
Owner TAIYUAN UNIV OF TECH