WO2020000990A1

WO2020000990A1 - Mechanical expansive type hole wall deformation sensor for hole drilling, and monitoring and using method

Info

Publication number: WO2020000990A1
Application number: PCT/CN2018/125960
Authority: WO
Inventors: 尹延春; 刘丹宁; 程凌云; 邢明录
Original assignee: 山东科技大学
Priority date: 2018-06-26
Filing date: 2018-12-30
Publication date: 2020-01-02
Also published as: CN109029235B; CN109029235A

Abstract

A mechanical expansive type hole wall deformation sensor for hole drilling, comprising a protective mechanism (1), an expansive mechanism (2), and a deformation measurement mechanism (3). The protective mechanism (1) comprises a first housing (11) and a second housing (12) sleeved on the first housing (11). The expansive mechanism (2) comprises a probe rod (21), a sleeve (22), and a transmission assembly (23), wherein the probe rod (21) passes through one end of the second housing (12) and is connected to the inner end wall of the other end of the second housing (12), the sleeve (22) is located within the first housing (11) and sleeved on the probe rod (21), a pull rod (24) is sleeved onto the sleeve (22), and the pull rod (24) passes through the second housing (12). The deformation measurement mechanism (3) comprises an outer measurement rod (31), a strain measurement rod (32), and a measurement base (33). The sleeve (22) is connected to the measurement base (33) by means of the transmission assembly (23). One end of the strain measurement rod (32) is connected to the measurement base (33), and the other end of the strain measurement rod (32) is connected to the outer measurement rod (31), and a strain gauge (34) is connected onto the strain measurement rod (32). The deformation sensor has a simple and novel structure, is convenient in measurement and use, and features low costs.

Description

Mechanical expansion type hole wall deformation sensor for drilling and monitoring using method

Technical field

[0001] The present invention relates to the field of mine pressure monitoring, and in particular, to a mechanical expansion type hole wall deformation sensor for drilling and a method for monitoring use thereof.

Background technique

[0002] In coal mining, the internal stress of the two sides of the roadway is an important part of the monitoring of the pressure of the coal. It is of great significance to analyze and evaluate the concentration of the stress of the coal body and to warn of dynamic disasters such as rockburst. At present, coal mines generally use borehole stress gauges to monitor the internal stress of the coal rock mass. The direct monitoring data is the load of the coal bodies on the borehole stress gauge. For relatively complete coal bodies, under the local stress of the surrounding rock, the coal body can produce a larger load on the borehole stress gauge, and the monitoring data is more accurate. When the coal body in the roadway is broken, the internal stress of the broken coal body near the borehole is relatively low, and the load on the borehole stress gauge is relatively small. The monitoring data changes little or almost no change, and the coal body stress in the roadway side cannot be accurately evaluated. size. Compared with the stress, the deformation of the borehole wall in the broken coal body is larger and easier to monitor, and the borehole deformation has a direct correlation with the internal stress of the coal body. Therefore, the coal body stress can be inverted by monitoring the coal body deformation. "A drilling deformation test device and test method for rocky soil mass" (application number CN201710841566.0) discloses a drilling deformation test device that can monitor the deformation of the borehole wall in multiple directions. In coal bodies with many cracks, the set screws are easy to insert into the cracks, and the measured deformation has no data change or there is a large error.

Summary of invention

technical problem

Problem solution

Technical solutions

[0003] An object of the present invention is to provide a mechanical expansion hole wall deformation sensor for drilling, which has a simple structure, convenient measurement and use, and low cost.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: [0005] A mechanical expansion hole wall deformation sensor for drilling includes a protection mechanism, an expansion mechanism, and a deformation measurement mechanism. The protection mechanism includes a first casing and a second casing sleeved outside the first casing. A shell is provided with a first through hole, and a second shell is provided with a second through hole;

[0006] The expansion mechanism includes a probe rod, a sleeve, and a transmission assembly. The probe rod passes through one end of the second casing and is connected to the inner end wall of the other end of the second casing. The sleeve is located in the first casing and is sleeved on the probe. A rod is connected to the sleeve, the rod passes through the second housing, and the transmission component passes through the first through hole;

[0007] The deformation measuring mechanism includes an external measuring rod, a strain measuring rod and a measuring base, the strain measuring rod and the measuring base are located between the second housing and the first housing, and the sleeve is connected to the measuring base through a transmission component, One end of the strain gauge rod is connected to the measurement base, the other end of the strain gauge rod is connected to an external gauge rod, and a strain gauge is connected to the strain gauge rod.

[0008] Preferably, the sleeve has a circular tube shape, and the transmission component includes a first transmission link, a second transmission link, and a first roller, and the first roller has a plurality of and is evenly distributed in the first through hole. .

[0009] Preferably, the sleeve is in the shape of a pyramid, and the transmission assembly includes a third transmission link, a second roller, and a third roller, and the second roller has a plurality of and is evenly distributed in the first through hole. .

[0010] Preferably, the first transmission link is located in the first housing, the second transmission link passes through the first through hole and is connected to the first roller; one end of the first transmission link is connected to the sleeve through the rotation shaft The outer wall of the tube is rotationally connected, the other end of the first transmission link is rotationally connected to one end of the second transmission link, and the other end of the second transmission link is fixedly connected to the side wall of the measurement base.

[0011] Preferably, the third transmission rod passes through the first through hole and is in contact with the second roller, one end of the third transmission rod is connected to a plurality of third rollers, and the third transmission rod passes the third roller It is connected to the outer wall of the casing, and the other end of the third transmission rod is fixedly connected to the side wall of the measurement base.

[0012] Preferably, the outer measuring rod includes an outer rod portion and an inner rod portion, the inner rod portion is vertically connected to the inner end wall of the outer rod portion, and the inner rod portion is vertically connected to the strain measuring rod through a second through hole.

[0013] Preferably, the strain gauge is a resistance strain gauge, and each strain gauge rod is connected to two strain gauges, and the two strain gauges are respectively adhered to the upper surface and the lower surface of the strain gauge rod.

[0014] Preferably, a first limit ring and a second limit ring are connected to the probe, the first limit ring is sleeved on the probe at the upper end of the sleeve, and the second limit ring is sleeved on the sleeve On the lower end of the tube.

[0015] Another object of the present invention is to provide a monitoring method using the mechanical expansion type hole wall deformation sensor. [0016] In order to achieve the above object, the technical solution adopted by the present invention is:

[0017] The monitoring method of the mechanical expansion hole wall deformation sensor specifically includes the following steps:

[0018] The first step is to first push the sleeve forward so that the deformation sensor is at the minimum filling volume;

[0019] In the second step, the deformation sensor is pushed into the deep part of the borehole of the coal body with a drill rod. During the pushing process, the sensor is prevented from rotating, and two pairs of external measuring rods are placed vertically and horizontally, and each measurement is recorded at the same time. Azimuth

[0020] In the third step, the strain gauge is connected to a data acquisition system, and the deformation sensor is expanded by pulling the sleeve after pulling the rod. At this time, observe the data of the strain gauge on each strain measuring rod. After each strain gauge has an obvious reading, Fixed casing

[0021] The fourth step is to monitor the data of the strain gauges on each of the strain gauge rods in real time, analyze the increase of the internal stress of the coal body according to the data change, and use a theoretical formula to inverse the relative change of the coal body stress;

[0022] In a fifth step, when a certain measurement point is discarded, the sleeve is pushed forward, and then the deformation sensor is taken out.

The beneficial effects of the invention

Beneficial effect

[0023] The beneficial effects of the present invention are:

[0024] Compared with the rigid elastic element that directly measures the coal body stress, the above-mentioned mechanical expansion hole wall deformation sensor for drilling is more sensitive to the deformation of the broken coal body, and it is easier to obtain accurate coal body deformation. Value to invert the coal body stress. The external measuring rod in the present invention can be in contact with a large area of coal in the inner wall of the borehole, thereby avoiding data errors caused by point contact. The deformation sensor of the present invention can monitor a plurality of coal body strains in different positions, thereby obtaining more accurate coal body stress values and stress increasing directions, and improving the comprehensiveness of coal body stress monitoring. The above-mentioned deformation sensor adopts a basic strain measurement principle, has a simple structure, is convenient to use, and has low cost.

Brief description of the drawings

BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG. 1 is a schematic cross-sectional view of a front view structure of a mechanically expanded hole wall deformation sensor for drilling in Embodiment 1.

[0026] FIG. 2 is a schematic sectional view of a plan structure of a mechanically expanded hole wall deformation sensor for drilling in Embodiment 1; Illustration.

[0027] FIG. 3 is a schematic diagram of a connection structure of a deformation measurement mechanism.

[0028] FIG. 4 is a schematic sectional view of a front view structure of a mechanically expanded hole wall deformation sensor for drilling in Embodiment 2.

Invention Examples

Embodiments of the invention

[0029] The present invention is described in detail below with reference to the drawings:

[0030] With reference to FIGS. 1 to 4, a mechanical expansion hole wall deformation sensor for drilling includes a protection mechanism 1, an expansion mechanism 2, and a deformation measurement mechanism 3. The protection mechanism 1 includes a first housing 11 and a sleeve. A second shell 12 outside the first shell 11 is provided with a first through hole 111 and a second shell 12 is provided with a second through hole 111.

121.

[0031] The expansion mechanism 2 includes a probe rod 21, a sleeve 22, and a transmission assembly 23. The probe rod 21 passes through one end of the second casing 12 and is connected to the inner end wall of the other end of the second casing 12. The sleeve 22 is located in the first housing 11 and is sleeved on the probe 21. The sleeve 22 is connected with a pull rod 24. The pull rod 24 passes through the second casing 12 and the transmission component 23 passes through the first through hole 111.

[0032] The deformation measurement mechanism 3 includes an external measurement rod 31, a strain measurement rod 32, and a measurement base 33. The strain measurement rod 32 and the measurement base 33 are located between the second casing 12 and the first casing 11, and the sleeve 22 The transmission component 23 is connected to the measurement base 33, one end of the strain measurement rod 32 is connected to the measurement base 33, the other end of the strain measurement rod 32 is connected to the external measurement rod 31, and a strain gauge 34 is connected to the strain measurement rod 32.

[0033] In the present invention, the first casing 11 and the second casing 12 are both cylindrical, the first through holes 111 and the second through holes 121 are multiple, and the multiple first through holes 111 are distributed in the first On the outer wall of the lower portion of a housing 11, a plurality of second through holes 121 are distributed on the upper outer wall of the second housing 12, and an external measuring rod 31 is connected to each of the second through holes 121. The measuring rod 31 is connected to a strain measuring rod 32.

[0034] The outer rod 31 includes an outer rod portion 311 and an inner rod portion 312. The inner rod portion 312 is vertically connected to the inner end wall of the outer rod portion 311. The inner rod portion 312 passes through the second through hole 121 and the strain measuring rod 32. Connected vertically. The strain gauges 34 in the present invention are resistance strain gauges. Each strain gauge rod 32 is connected to two strain gauges 34, and the two strain gauges 34 are respectively adhered to the upper surface and the lower surface of the strain gauge rod 32.

[0035] The probe 21 is in the shape of a round rod, and the first limit ring 211 and the second limit ring 212 are connected to the probe 21, the first limit position The ring 211 is sleeved on the probe 21 at the upper end of the sleeve 22, and the second limit ring 212 is sleeved on the probe 21 at the lower end of the sleeve 22.

[0036] There are different structural embodiments for the structure in which the sleeve 22 and the transmission assembly 23 are connected.

[0037] Embodiment 1, when the sleeve 22 is in a circular tube shape. The transmission assembly 23 includes a first transmission link 41, a second transmission link 42, and a first roller 43. The first roller 43 has a plurality of and is evenly distributed in the first through hole 111. The first transmission link 41 is located in the first housing 11, and the second transmission link 42 passes through the first through hole 111 and is in contact with the first roller 43. One end of the first transmission link 41 is rotatably connected to the outer wall of the sleeve 22 through a rotating shaft, the other end of the first transmission link 41 is rotatably connected to one end of the second transmission link 42 and the other end of the second transmission link 42 is connected to The side walls of the measurement base 33 are fixedly connected.

[0038] Embodiment 2, when the sleeve 22 is in the shape of a pyramid. The transmission assembly 23 includes a third transmission link 51, a second roller 52, and a third roller 53. The second roller 52 is multiple and is evenly distributed in the first through hole 111. The third transmission rod 51 passes through the first through hole 111 and is in contact with the second roller 52. One end wall of the third transmission rod 51 is connected to a plurality of third rollers 53. The third transmission rod 51 passes through the third The roller 53 is connected to the outer wall of the sleeve 22, and the other end of the third transmission rod 51 is fixedly connected to the side wall of the measurement base 33.

[0039] The monitoring and using method of the mechanical expansion hole wall deformation sensor for drilling mentioned above specifically includes the following steps:

[0040] The first step is to first push the sleeve 22 forward so that the deformation sensor is at a minimum filling volume;

[0041] In the second step, the deformation sensor is pushed into the deep part of the borehole of the coal body with a drill pipe. Note that during the pushing process, avoid the sensor from rotating, ensure that there are two pairs of external measuring rods 31 placed vertically and horizontally, and record the azimuth of each measuring rod at the same time;

[0042] In the third step, the strain gauge 34 is connected to a data acquisition system, and the deformation sensor is expanded by pulling the sleeve 22 behind the pull rod 24. At this time, the data of the strain gauge 34 on each strain gauge rod 32 is observed. After having obvious readings, fix the casing 22;

[0043] In the fourth step, the data of the strain gauges 34 on each of the strain gauge rods 32 are monitored in real time, the orientation of the internal stress increase of the coal body is analyzed based on the data changes, and the relative change value of the coal body stress is inverted using a theoretical formula;

[0044] In the fifth step, when a certain measuring point is discarded, the sleeve 22 is pushed forward, and then the deformation sensor is taken out.

[0045] Compared with the rigid elastic element that directly measures the coal body stress, the above-mentioned mechanical expansion hole wall deformation sensor for drilling is more sensitive to the deformation of the broken coal body, and it is easier to obtain accurate coal body deformation. Shape value to inverse the coal body stress. The outer measuring rod 31 in the present invention can be in contact with a large area of coal body on the inner wall of the borehole, thereby avoiding data errors caused by point contact. The deformation sensor of the present invention can monitor coal body strains in multiple different orientations, thereby obtaining more accurate coal body stress values and stress increasing orientations, and improving the comprehensiveness of coal body stress monitoring. The above-mentioned deformation sensor adopts a basic strain measurement principle, has a simple structure, is convenient to use, and has low cost.

[0046] Of course, the above description is not a limitation on the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention are also It should belong to the protection scope of the present invention.

Industrial applicability

[0047] Type a paragraph describing industrial applicability here.

Sequence Listing Free Content

[0048] Type the free description paragraph of the sequence listing here.

Claims

Claim

[Claim 1] A mechanical expansion hole wall deformation sensor for drilling, comprising a protection mechanism, an expansion mechanism, and a deformation measurement mechanism. The protection mechanism includes a first casing and a casing that is sleeved outside the first casing. A second shell, a first through hole is opened on the first shell, and a second through hole is opened on the second shell;

The expansion mechanism includes a probe rod, a sleeve and a transmission assembly. The probe rod passes through one end of the second casing and is connected to the inner end wall of the other end of the second casing. The sleeve is located in the first casing and is sleeved on the probe rod. A pull rod is connected to the sleeve, the pull rod passes through the second housing, and the transmission component passes through the first through hole; the deformation measurement mechanism includes an external measurement rod, a strain measurement rod, and a measurement base, and the strain measurement rod and the measurement base are located on the second Between the casing and the first casing, the sleeve is connected to the measurement base through a transmission component, one end of the strain measurement rod is connected to the measurement base, and the other end of the strain measurement rod is connected to the external measurement rod. Strain gauges.

[Claim 2] A mechanical expansion hole wall deformation sensor for drilling according to claim i, wherein the sleeve is in a circular tube shape, and the transmission component includes a first transmission link, a second The transmission link and the first roller have a plurality of first rollers and are evenly distributed in the first through hole.

[Claim 3] The mechanical expansion hole wall deformation sensor for drilling according to claim i, wherein the sleeve is in the shape of a pyramid, and the transmission component includes a third transmission link, a first The second roller and the third roller have a plurality of second rollers and are evenly distributed in the first through hole.

[Claim 4] The mechanical expansion hole wall deformation sensor for drilling according to claim 2, wherein the first transmission link is located in the first housing, and the second transmission link passes through Passes through the first through hole and is in contact with the first roller; one end of the first transmission link is rotatably connected with the outer wall of the sleeve through the rotation shaft, and the other end of the first transmission link is rotatably connected with one end of the second transmission link, The other end of the second transmission link is fixedly connected to the side wall of the measurement base.

[Claim 5] The mechanical expansion hole wall deformation sensor for drilling according to claim 3, wherein the third transmission rod passes through the first through hole and is in phase with the second roller. One end of the third transmission rod is connected to a plurality of third rollers, the third transmission rod is connected to the outer wall of the casing through the third roller, and the other end of the third transmission rod is fixedly connected to the side wall of the measurement base.

[Claim 6] A mechanical expansion hole wall deformation sensor for drilling according to claim 1, It is characterized in that the external measuring rod includes an external rod portion and an internal rod portion, the internal rod portion is vertically connected to the inner end wall of the external rod portion, and the internal rod portion passes through the second through hole and is vertically connected with the strain measuring rod.

[Claim 7] The mechanical expansion type hole wall deformation sensor for drilling according to claim 1, wherein the strain gauge is a resistance strain gauge, and each strain gauge rod is connected with two strain gauges. The two strain gauges are adhered to the upper and lower surfaces of the strain gauge rod, respectively.

[Claim 8] The mechanical expansion type hole wall deformation sensor for drilling according to claim 1, wherein a first limit ring and a second limit ring are connected to the probe rod, The first limit ring is sleeved on the probe at the upper end of the casing, and the second limit ring is sleeved on the probe on the lower end of the casing.

[Claim 9] The monitoring and using method, characterized in that the mechanical expansion type hole wall deformation sensor for drilling according to claims 4 to 8 is used, and specifically comprises the following steps:

In the first step, first push the casing forward so that the deformation sensor is at the minimum filling volume; in the second step, push the deformation sensor into the deep part of the borehole of the coal body with a drill rod. During the pushing process, avoid the sensor to rotate, and ensure that there are two Place the external rods vertically and horizontally, and record the azimuth of each rod at the same time. The third step, the strain gauge is connected to the data acquisition system, and the deformation sensor is expanded by pulling the sleeve after pulling the rod. At this time, observe each strain measurement. The data of the strain gauges on the rod are fixed to the casing after each strain gauge has an obvious reading;

The fourth step is to monitor the data of the strain gauges on each of the strain gauge rods in real time, analyze the increase of the internal stress of the coal body according to the change of the data, and use a theoretical formula to invert the relative change of the coal body stress. , Push the sleeve forward, and then remove the deformation sensor.