CN-116773068-B - Stress sensor assembly and method of installing a sensor assembly

CN116773068BCN 116773068 BCN116773068 BCN 116773068BCN-116773068-B

Abstract

Embodiments of the present invention provide a stress sensor assembly and a method of installing a sensor assembly. The stress sensor assembly comprises a sensor body, a positioning rod, an elastic sleeve, a fluid anchoring agent layer and a deformation opening member. The sensor body is placed in a drill hole, the locating rod extends along a first direction, one end of the locating rod is connected with the sensor body, the locating rod is arranged along the extending direction of the first direction, the elastic sleeve is sleeved outside the locating rod, the elastic sleeve and the locating rod are provided with gaps, the deformation expanding piece is provided with an initial position and an extrusion position, the deformation expanding piece is sleeved on the locating rod, the deformation expanding piece is erected on the second end of the elastic sleeve at the initial position, and the deformation expanding piece contracts in the elastic sleeve at the extrusion position. Therefore, the stress sensor assembly according to the embodiment of the invention has the advantages of simple structure and high construction convenience.

Inventors

He Tuan
XUE SHANSHAN
LI XIANGSHANG
LI XIAOPENG
ZHENG WEIYU
QI QINGXIN
LI CHUNYUAN
MU PENGYU
ZHENG JIANWEI
ZHANG LIANG
LEI GUORONG
HE XIAOFAN

Assignees

煤炭科学研究总院有限公司

Dates

Publication Date: 20260508
Application Date: 20230612

Claims (10)

1. A stress sensor assembly, comprising: The sensor body is placed in the drill hole; the positioning rod extends along a first direction, one end of the positioning rod is connected with the sensor body, and the positioning rod is arranged along the extending direction of the first direction; the elastic sleeve is sleeved outside the positioning rod, the elastic sleeve is provided with a first end and a second end which are oppositely arranged along the extending direction of the elastic sleeve, the elastic sleeve and the positioning rod are provided with a gap, the first end of the elastic sleeve is abutted to the sensor body, and the elastic sleeve, the positioning rod and the sensor body are limited out of the accommodating cavity; A fluid anchor layer filled within the containment chamber; the deformation strutting piece is provided with an initial position and an extrusion position, the deformation strutting piece is provided with an avoidance guide part, the positioning rod is arranged in the avoidance guide part in a penetrating mode, the deformation strutting piece is movable relative to the positioning rod so that the deformation strutting piece can rotate from the initial position to the extrusion position, the deformation strutting piece is arranged at the initial position and is arranged at the second end of the elastic sleeve in a erecting mode, and the deformation strutting piece contracts in the elastic sleeve so as to deform the elastic sleeve in the extrusion position.
2. The stress sensor assembly of claim 1, wherein the deformation spreader comprises a spring and a driving rod, one end of the driving rod is connected with the spring, the other end of the driving rod extends out of the borehole in a direction away from the spring, a portion of the spring protrudes toward a direction close to the sensor body relative to the rest of the spring so as to form a protrusion, and the protrusion is provided with the avoidance guide.
3. The stress sensor assembly of claim 2, wherein the spring is provided with a plurality of through holes for allowing the fluid anchor layer to pass through the spring during rotation of the deformed spreader member from the initial position to the squeezed position.
4. The stress sensor assembly of claim 2, wherein the spring plate is provided with one of a limit guide protrusion and a guide groove extending in the first direction, the positioning rod has the other of the limit guide protrusion and the guide groove, and the limit guide protrusion is movably disposed in the guide groove.
5. The stress sensor assembly of claim 4, wherein the spring plate comprises a hanging ring and a sliding rod, the hanging ring is provided with a notch extending along a second direction, the driving rod is abutted on the hanging ring, the sliding rod is hung on the hanging ring so as to form the limit guide protrusion, and the first direction is perpendicular to the second direction.
6. The stress sensor assembly of claim 5, wherein the suspension ring includes a ring plate portion and a plurality of anti-tip-over spikes thereon, the notch being formed in the ring plate portion, the drive rod abutting the ring plate portion, the plurality of anti-over spikes being disposed at spaced apart and divergent outer peripheral edges of the ring plate portion.
7. The stress sensor assembly of claim 2, wherein the outer diameter of the spring plate is 1.1 to 1.2 times the outer diameter of the elastic sleeve; and/or, the shore hardness of the elastic sheet is greater than the shore hardness of the elastic sleeve; and/or the elastic sleeve is a hard rubber cylinder.
8. The stress sensor assembly of claim 2, wherein the driving rod comprises a rod portion and a pressing ring portion, the pressing ring portion is disposed at one end of the rod portion, the pressing ring portion abuts against the elastic sheet, and the pressing ring portion is in a horn shape.
9. The stress sensor assembly of claim 8, wherein the stem comprises a plurality of segments, the segments being removably connected in sequence in an end-to-end orientation; and/or the length of the driving rod is 5m-20m.
10. A method of installing a sensor assembly, characterized in that a stress sensor assembly according to any of claims 1-9 is provided, a fluid anchoring agent layer is preset in the receiving cavity, the stress sensor assembly is placed in the borehole, and the elastic sleeve is spread by the deformation spreader to flow the fluid anchoring agent layer in the receiving cavity into the borehole for installation of a corresponding force sensor.

Description

Stress sensor assembly and method of installing a sensor assembly Technical Field The invention relates to the technical field of rock mass high stress monitoring, in particular to a stress sensor assembly and a method for installing the stress sensor assembly. Background The problem of disaster caused by high stress of the deep rock mass and engineering disturbance is more remarkable, and disasters such as surrounding rock instability, rock burst and water burst occur frequently in the process of deep engineering construction. Under the condition of high ground stress, local stress concentration can be generated under the condition that a rock mass is excavated or is disturbed by other factors, the stress is accumulated to a certain degree, and deformation of a drill hole occurs to squeeze the sensor. The strain gauge of the strain sensor is stuck on the surface of the elastomer or directly stuck on the tested piece. The deformation of the elastic body or the test piece is transmitted to the sensitive grid through the substrate and the adhesive, the resistance value of the sensitive grid is correspondingly changed, and the strain can be measured by converting the change into the change of voltage or current through the conversion circuit. And further determining the time, the position and the energy of the occurrence of rock fracture, thereby giving guidance to engineering and ensuring construction safety. During engineering construction, the sensor needs to be placed in the drill hole in a mechanical fixing mode, and the sensor is injected into the drill hole through grouting liquid to fix the stress sensor. In the related art, grouting liquid is injected into a borehole in a manner that a hydraulic pump is matched with a grouting pipe so as to fix a sensor. Because the detection of the stress of the rock mass generally needs to be provided with a plurality of stress monitoring points so as to realize the omnibearing stress monitoring, the plurality of monitoring points are distributed at intervals. After the sensor of a monitoring point is installed and constructed by the hydraulic pump and the grouting pipe, the hydraulic pump and the grouting pipe are manually conveyed to the next monitoring point, and the problems of high labor intensity and low construction efficiency exist. Disclosure of Invention The present invention aims to solve at least one of the technical problems in the related art to some extent. To this end, embodiments of the present invention provide a stress sensor assembly. The stress sensor assembly has the advantages of simple structure and high construction convenience. Embodiments of the present invention also provide a method of installing a sensor assembly. The stress sensor assembly comprises a sensor body, a positioning rod, an elastic sleeve, a fluid anchoring agent layer and a deformation opening member. The sensor body is placed in a drill hole, the locating rod extends along a first direction, one end of the locating rod is connected with the sensor body, the locating rod is arranged along the extending direction of the first direction, the elastic sleeve is sleeved outside the locating rod, the elastic sleeve is provided with a first end and a second end which are oppositely arranged along the extending direction of the elastic sleeve, the elastic sleeve is provided with a gap with the locating rod, the first end of the elastic sleeve is abutted to the sensor body, the elastic sleeve, the locating rod and the sensor body are limited out of a containing cavity, the fluid anchoring agent layer is filled in the containing cavity, the deformation supporting member is provided with an initial position and an extrusion position, the deformation supporting member is provided with an avoidance guide part, the locating rod is sleeved in the avoidance guide part, the deformation supporting member is movable relative to the locating rod so as to rotate from the initial position to the extrusion position, the deformation supporting member is arranged at the second end of the elastic sleeve, and the deformation supporting member is deformed in the extrusion position. According to the stress sensor assembly, the fluid anchoring agent layer is arranged in the accommodating cavity formed by the elastic sleeve, the positioning rod and the sensor body, when the stress sensor assembly is installed, the elastic sleeve is caused to deform under the action of the deformation supporting piece through the movement of the deformation supporting piece, so that the first end of the elastic sleeve is supported and then is separated from and abutted against the sensor body, the fluid anchoring agent layer in the accommodating cavity flows out from the first end and continuously flows downwards between the drill hole and the sensor body along the sensor body, after the fluid anchoring agent layer is solidified, the sensor body is fixed in the drill hole, and therefore the stress sensor assembly is inst