A pressure cell for testing the extrusion force of surrounding rock on the shield of a full-face tunnel boring machine
A technology of tunnel boring machine and pressure cell, which is applied in tunnels, measuring devices, force/torque/work measuring instruments, etc., which can solve problems such as low shear strength, rock scratching, and damage to the internal structure of the sensor, and achieve accurate measurement of extrusion The effect of pressure
Active Publication Date: 2019-05-21
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI +1
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Problems solved by technology
The outer surface of the shield is a smooth cylindrical steel surface that moves forward continuously with the TBM excavation. If the sensor is glued on the outer surface of the shield with AB glue, epoxy glue, etc. When the sensor on the shield moves forward with the TBM excavation, due to the low shear strength of this type of glue, it is easily scratched off by the rocks on the surrounding contact, making the sensor invalid
It is also not possible to directly weld the pressure sensor on the shield or other steel support structures, because the high temperature generated by welding will damage the internal structure of the sensor
Method used
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Embodiment 1
[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0027] A pressure box for testing the extrusion force of surrounding rock on the shield of a full-face tunnel boring machine (TBM), which includes: a cup-shaped base 1, an annular box cover 2, a pressure sensor 3 and a wire protection sleeve 4. Its connection relationship is: the bottom of the cup-shaped base 1 is welded on the outer surface of the shield, the cup-shaped base 1 is connected with the wire protection sleeve 4, and there is an outer edge 9 of the box cover at one end of the top annular box cover 2. There is an inner thread 10 inside the edge 9, and an outer thread 5 on the upper end of the cup-shaped base 1. Put the pressure sensor 3 into the cup-shaped base 1, and insert the pressure sensor cable 7 that comes with the pressure sensor 3 from the upper end of the cup-shaped base 1. Pass through the groove 6, put the protective wire sleeve 4 aroun...
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The invention discloses a pressure cell for testing squeezing pressure on the shield of a tunnel boring machine applied by surrounding rock. The bottom of a cup-shaped base is welded onto the outer surface of the shield; the cup-shaped base is connected with a wire protecting bushing; one end of an annular cell cover at the top of the pressure cell is provided with an external cell cover edge; the inner side of the external cell cover edge is provided with inner screw threads; the upper end of the cup-shaped base is provided with outer screw threads; a pressure sensor is arranged in the cup-shaped base; a pressure sensor cable of the pressure sensor extends out from a groove at the upper end of the cup-shaped base; the pressure sensor cable is sleeved with the wire protecting bushing; and the cup-shaped base is covered with the annular cell cover; the cup-shaped base is in threaded connection with the annular cell cover; and the pressure sensor contact of the pressure sensor extends out form the center hole of the annular cell cover. The pressure cell is simple in structure and is convenient to manufacture. The installation success rate and long-term firmness of the pressure cell are greatly improved, and therefore, accurate measurement of the squeezing pressure on the shield of the tunnel boring machine (TBM) applied by the surrounding rock can be realized.
Description
technical field [0001] The present invention relates to the field of TBM tunnel surrounding rock and shield interaction testing and analysis technology, and more specifically relates to a device for testing the extrusion force of surrounding rock on TBM shield, which can also be applied to underground engineering surrounding rock and steel support structure Interaction stress testing. Background technique [0002] TBM (Full Face Tunnel Boring Machine) has been more and more widely used in the excavation of long tunnels and deep rock roadways in mines. Among them, the test of the extrusion force of the surrounding rock on the TBM shield is the key to the shield load analysis of the shield-type TBM and the prediction and analysis of the shield accident, especially when the TBM passes through the area with poor geological conditions, the pressure box is the main test. means. The outer surface of the shield is a smooth cylindrical steel surface that moves forward continuously ...
Claims
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IPC IPC(8): G01L5/00E21D9/087
CPCG01L5/0061
Inventor 黄兴刘泉声彭星新张晓平张建明张晓波
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI