CN112033358B - Mining subsidence area settlement monitoring device - Google Patents
Mining subsidence area settlement monitoring device Download PDFInfo
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- CN112033358B CN112033358B CN202010955247.4A CN202010955247A CN112033358B CN 112033358 B CN112033358 B CN 112033358B CN 202010955247 A CN202010955247 A CN 202010955247A CN 112033358 B CN112033358 B CN 112033358B
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Abstract
The invention discloses a mining subsidence area subsidence monitoring device, which adopts the technical scheme that: comprises a controller, a fixed bearing plate and a movable bearing plate; the fixed bearing plate and the movable bearing plate are both provided with fixed pulleys, and ropes are wound on the fixed pulleys between the fixed bearing plate and the movable bearing plate; one end of the rope is fixedly connected with the fixed bearing plate or the movable bearing plate, and the other end of the rope is fixedly connected with the fixed bearing plate or the movable bearing plate through the tensile displacement sensor; the fixed bearing plate is fixedly connected with the upper base protective cylinder through a connecting rod; the base protection cylinder is provided with an external thread cylinder, the external thread cylinder is in threaded fit with the movable bearing plate, a driving motor is installed in the base protection cylinder, and the output end of the driving motor is fixedly connected with the external thread cylinder; the output end of the stretching displacement sensor is electrically connected with the input end of the controller, and the output end of the controller is electrically connected with the input end of the driving motor. The method has the advantages of strong applicability, high automation degree, high accuracy of monitoring results, low investment cost and the like.
Description
Technical Field
The invention relates to the technical field of mining area environment management, in particular to a mining subsidence area subsidence monitoring device.
Background
The mined out area breaking down refers to the ground collapse phenomenon caused by the instability of an upper rock-soil layer under the action of self weight due to the formation of a space by underground excavation. Along with the increasing of coal demand, the problem of mining subsidence is more and more serious under the influence of the expansion of the development scale of coal resources, and the coal resource development makes great contribution to the social and economic development and simultaneously causes very important influence and damage to the mining area environment, so that the research on the monitoring of the subsidence of the mining subsidence area is very necessary.
At present, when a goaf subsidence area sinks, the sinking speed of the goaf subsides from top to bottom in an increasing trend along with the difference of the depth position between the ground surface and a goaf bottom plate. Now, a chinese patent with publication number CN103528563B is retrieved, and discloses a method for monitoring subsidence in a mining subsidence area by using a subsidence monitoring system, which mainly comprises: the normal-speed sinking layer pile casing, the slow-speed sinking layer pile casing and the micro-speed sinking layer pile casing are respectively nested with the steel base pile casing layer by layer through a sealing ring and a ball, and are anchored with the layers to which the pile casings belong through annular bulges; and then, the subsidence numerical values of all layers are read through the first fixed end and the first measuring tape, the second fixed end and the second measuring tape, and the third fixed end and the third measuring tape by means of a ground pulley and counterweight weight combined structure, so that the monitoring of the mining subsidence area is realized. The method can monitor the subsidence development of the mining subsidence area in real time, continuously and in millimeter level, and provides powerful support for the environmental management of the mining area.
However, the above-mentioned mining subsidence area subsidence monitoring technology has the following defects: 1. along with more detailed division of subsidence layers with different subsidence speeds, the number of the tape measures is increased continuously, the installation and operation of the tape measures are complex, and adjacent tape measures are easy to contact and interfere with each other; 2. one end of the tape measure is fixed relative to the ground surface, and the other end of the tape measure is fixedly connected with the corresponding protective cylinder, so that the longer the tape measure corresponding to the protective cylinder on the bottom layer, the larger the detection error under the action of the tension of the tape measure; 3. the sinking numerical value is read by means of the ground pulley and counterweight weight combined structure, and the accuracy of the sinking numerical value is easily influenced by external environmental factors such as ground surface vibration, wind power, sundry attachment and the like; 4. the sinking amount between each sinking layer and the ground can only be measured by reading the sinking value, and the function is single; meanwhile, the cost of manpower and material resources input in the whole detection process is high, the intelligent degree is low, and the popularization and the application are difficult. Therefore, how to further study and design a mining subsidence area subsidence monitoring device is a problem which is urgently needed to be solved at present.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the mining subsidence area subsidence monitoring device which has the advantages of strong applicability, high automation degree, high accuracy of monitoring results, low investment cost and the like, and can be popularized and applied in a large range.
The technical purpose of the invention is realized by the following technical scheme: a mining subsidence area settlement monitoring device comprises a top plate fixed relative to the ground, a base pile casing sleeved from top to bottom, a controller, a fixed bearing plate and a movable bearing plate, wherein the fixed bearing plate and the movable bearing plate are positioned in the base pile casing; the top end of the base protection cylinder is provided with an opening, and the bottom end of the base protection cylinder is closed; the fixed bearing plate and the movable bearing plate are provided with at least one fixed pulley on opposite surfaces, and a rope forming at least two displacement sections is wound on the fixed pulley between the fixed bearing plate and the movable bearing plate; one end of the rope is fixedly connected with the fixed bearing plate or the movable bearing plate, and the other end of the rope is fixedly connected with the fixed bearing plate or the movable bearing plate through the tensile displacement sensor; the fixed bearing plate is fixedly connected with the bottom surface of the upper base protective cylinder through a connecting rod; at least two external thread cylinders are arranged in the base protection cylinder, the external thread cylinders are in threaded fit with the movable bearing plate, a driving motor is arranged in the base protection cylinder, and the output end of the driving motor is fixedly connected with the bottom ends of the external thread cylinders; the output end of the stretching displacement sensor is electrically connected with the input end of the controller, and the output end of the controller is electrically connected with the input end of the driving motor.
By adopting the technical scheme, the monitoring device is vertically arranged in a cavity between the ground surface and the bottom plate of the goaf and is fixed with the subsidence layer in a one-to-one correspondence manner through concrete or structural adhesive; when settlement occurs between adjacent settlement layers, the lower base pile casing slides downwards vertically relative to the upper base pile casing, so that the fixed bearing plate and the movable bearing plate synchronously deviate from each other, the rope slides between the fixed pulleys, the tensile displacement sensor measures the movement amount of the rope, the movement amount and the set number of displacement sections are calculated to obtain settlement values between the adjacent settlement layers, and the displacement amount between the spaced settlement layers can be obtained by directly superposing the settlement values of the adjacent settlement layers; after the numerical value monitoring of once sinking is accomplished, controller control driving motor starts, and driving motor drives an external screw thread section of thick bamboo and rotates for the vertical upward movement of activity loading board resumes to initial condition, makes things convenient for the displacement volume between the repeated accurate measurement sinking layer.
The invention is further configured to: the displacement section is arranged in parallel with the axis direction of the base protection cylinder.
Through adopting above-mentioned technical scheme, can directly obtain the settlement numerical value between the adjacent subsidence layer with the quantity that the displacement section set up is divided to the amount of movement, not only the calculation easy operation of settlement numerical value avoids displacement section slope to set up and leads to the great problem of settlement numerical value calculation error simultaneously.
The invention is further configured to: the driving motor is shut down in response to a zero detection signal of the tension displacement sensor.
Through adopting above-mentioned technical scheme, when the vertical rebound of activity loading board, the rope slides on the fixed pulley for tensile displacement sensor resumes gradually, and driving motor stops when tensile displacement sensor detected value is zero, even can repeat stable monitoring of tensile displacement sensor, can calibrate the system that rope, fixed pulley, tensile displacement sensor are constituteed again at every turn simultaneously, has improved the accuracy of monitoring result at every turn.
The invention is further configured to: the output end of the controller is provided with an alarm, the controller generates an alarm command after outputting a control rotating angle to reach an early-warning rotating angle, and the alarm responds to the alarm command and then sends out an alarm signal.
Through adopting above-mentioned technical scheme, when controller control driving motor ordered about the activity loading board and reached certain displacement volume, the settlement numerical value between the adjacent subsidence layer reaches dangerous edge promptly, sends alarm signal through the alarm and carries out the early warning.
The invention is further configured to: the input of controller is equipped with angle sensor, and angle sensor is used for measuring driving motor's actual turned angle, and the controller generates the early warning order according to actual turned angle and output control turned angle contrast result, and the alarm sends early warning signal after responding to the early warning order.
Through adopting above-mentioned technical scheme, if actual turned angle and output control turned angle contrast result are inconsistent, then show that there is not hard up condition between tensile displacement sensor, rope, fixed pulley, the activity loading board, make things convenient for the staff to make the counter-measure after receiving early warning signal, its reliability of using is strong.
The invention is further configured to: the output end of the controller is provided with a wireless communication module for remote control.
Through adopting above-mentioned technical scheme, wireless communication module can be with the output signal transmission of subsidence numerical value and alarm to the host computer, and the control command of acceptable host computer transmission simultaneously realizes unmanned remote monitoring, and the manpower and materials cost that drops into is with low costs.
The invention is further configured to: the top plate surface is equipped with the display screen, and the input of display screen is connected with the output of controller.
By adopting the technical scheme, the display screen can display the subsidence numerical value and the output signal of the alarm in real time, and maintenance personnel can conveniently and visually check the running state of the monitoring device.
The invention is further configured to: the top end of the external thread cylinder is movably inserted with an inserted bar, and the other end of the inserted bar is fixedly connected with the outer bottom surface of the upper base protective cylinder.
Through adopting above-mentioned technical scheme, the inserted bar is pegged graft with the activity of an external screw thread section of thick bamboo, can restrict adjacent base and protect the relative circumferential rotation condition between the section of thick bamboo and take place, has strengthened the stability that monitoring devices used.
The invention is further configured to: and an airtight layer is arranged on the inner wall of the base protective cylinder.
By adopting the technical scheme, the airtight layer can prevent external humid air from entering the base casing, so that devices inside the base casing run in a relatively stable environment, and the service life of the monitoring device is prolonged.
The invention is further configured to: the outer wall of the base pile casing is provided with a triangular anchoring ring.
Through adopting above-mentioned technical scheme, when base protects a section of thick bamboo and the subsidence layer fixed mounting that corresponds, anchor ring can restrict base and protect a section of thick bamboo and slide relatively for corresponding subsidence layer.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can flexibly adjust the number of the base protective cylinders along with the increase of the layering number of the subsidence layers, and the monitoring between the adjacent base protective cylinders is independent and does not influence each other, the installation is convenient, the operation of internal devices is stable, and the monitoring result is stable and reliable;
2. according to the invention, the monitoring between the adjacent base protective cylinders is independent and complementary, the automatic monitoring of the subsidence numerical value is realized through a plurality of displacement sections, the fixed pulleys and the tensile displacement sensor, the influence of the self tension of the rope on the monitoring result is weakened, and the monitoring error is small;
3. the method can directly obtain the sinking numerical values between the adjacent sinking layers and can also obtain the sinking numerical values between the spaced sinking layers, thereby realizing unmanned remote monitoring, having strong applicability and low investment cost;
4. according to the invention, accumulated subsidence values are counted, when a preset value is obtained, an alarm signal is automatically sent out, and meanwhile, after each monitoring is finished, the internal devices of the monitoring device are reset and automatically calibrated, so that the accuracy of the integral monitoring result is high.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic view of the overall structure in an embodiment of the present invention;
FIG. 2 is a schematic view showing the arrangement of the fixed pulleys in the embodiment of the present invention;
FIG. 3 is a schematic diagram of a base shroud in an embodiment of the invention;
fig. 4 is a schematic diagram of the operation in the embodiment of the present invention.
In the figure: 101. an airtight layer; 102. a base protection cylinder; 103. a drive motor; 104. an externally threaded barrel; 105. inserting a rod; 106. a connecting rod; 107. fixing a bearing plate; 108. a tension displacement sensor; 109. a movable bearing plate; 110. a fixed pulley; 111. a rope; 112. an anchoring ring; 201. a top plate; 202. a display screen; 203. sealing the column; 301. a controller; 302. an alarm; 303. a wireless communication module; 304. an angle sensor.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to fig. 1 to 4 and the embodiments.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Example (b): a mining subsidence area subsidence monitoring device is shown in figures 1, 2 and 4 and comprises a top plate 201 fixed relative to the ground, a plurality of base pile casings 102 and a controller 301, wherein the base pile casings 102 are sequentially sleeved from top to bottom, and a fixed bearing plate 107 and a movable bearing plate 109 are arranged in the base pile casings 102. The base casing 102 is open at the top and closed at the bottom. The fixed bearing plate 107 and the movable bearing plate 109 are provided with at least one fixed pulley 110 on their facing surfaces, and a rope 111 forming at least two displacement sections is wound around the fixed pulley 110 between the fixed bearing plate 107 and the movable bearing plate 109. One end of the rope 111 is fixedly connected with the fixed bearing plate 107 or the movable bearing plate 109, and the other end is fixedly connected with the fixed bearing plate 107 or the movable bearing plate 109 through the tensile displacement sensor 108; the fixed bearing plate 107 is fixedly connected with the bottom surface of the upper base casing 102 through the connecting rod 106. At least two external thread cylinders 104 are arranged in the base casing 102, the external thread cylinders 104 are in thread fit with the movable bearing plate 109, a driving motor 103 is arranged in the base casing 102, and the output end of the driving motor 103 is fixedly connected with the bottom ends of the external thread cylinders 104. The output end of the stretching displacement sensor 108 is electrically connected with the input end of the controller 301, and the output end of the controller 301 is electrically connected with the input end of the driving motor 103. Wherein, the base casing 102 of top layer is movably inserted with a sealing column 203, and the other end of the sealing column 203 is fixedly connected with the top plate 201.
As shown in fig. 1 and 4, the monitoring device is vertically installed in a cavity between the ground surface and the goaf floor, and is fixed to the subsidence layer by concrete or structural adhesive in a one-to-one correspondence manner. When sinking occurs between adjacent sinking layers, the base pile 102 of the lower layer slides relative to the base pile 102 of the upper layer downwards vertically, so that the fixed bearing plate 107 and the movable bearing plate 109 move away from each other synchronously, the rope 111 slides between the fixed pulleys 110, the tensile displacement sensor 108 measures the movement amount of the rope 111, the movement amount and the displacement section setting amount are calculated to obtain the sinking numerical value between the adjacent sinking layers, and the displacement amount between the spaced sinking layers can be obtained by directly superposing the sinking numerical values of the adjacent sinking layers. After the primary settlement numerical value monitoring is completed, the controller 301 controls the driving motor 103 to be started, and the driving motor 103 drives the external thread cylinder 104 to rotate, so that the movable bearing plate 109 vertically moves upwards to recover to an initial state, and the displacement between the settlement layers can be conveniently and accurately measured repeatedly.
As shown in fig. 2, the displacement section is arranged parallel to the axial direction of the base casing 102. The displacement is divided by the number of the displacement sections, so that the settlement numerical value between adjacent settlement layers can be directly obtained, the calculation operation of the settlement numerical value is simple, and the problem that the calculation error of the settlement numerical value is large due to the inclined arrangement of the displacement sections is avoided.
As shown in fig. 1 and 4, the shutdown of the drive motor 103 is in response to a zero detection signal from the tension displacement sensor 108. When activity loading board 109 vertical upward movement, rope 111 slides on fixed pulley 110 for tensile displacement sensor 108 resumes gradually, and driving motor 103 stops when tensile displacement sensor 108 detected value is zero, i.e. so that tensile displacement sensor 108 can repeat stable monitoring, can calibrate the system that rope 111, fixed pulley 110, tensile displacement sensor 108 constitute again at every turn simultaneously, has improved the accuracy of monitoring result at every turn.
As shown in fig. 4, an alarm 302 is provided at an output end of the controller 301, the controller 301 generates an alarm command after outputting a control rotation angle to reach an early-warning rotation angle, and the alarm 302 sends an alarm signal in response to the alarm command. When the controller 301 controls the driving motor 103 to drive the movable bearing plate 109 to reach a certain displacement, that is, the sinking value between adjacent sinking layers reaches a dangerous edge, an alarm signal is sent out through the alarm 302 to perform early warning.
As shown in fig. 4, an angle sensor 304 is disposed at an input end of the controller 301, the angle sensor 304 is configured to measure an actual rotation angle of the driving motor 103, the controller 301 generates an early warning command according to a comparison result of the actual rotation angle and the output control rotation angle, and the alarm 302 sends an early warning signal after responding to the early warning command. If the comparison result of the actual rotation angle and the output control rotation angle is inconsistent, the loosening condition exists among the tensile displacement sensor 108, the rope 111, the fixed pulley 110 and the movable bearing plate 109, so that the working personnel can conveniently take measures after receiving the early warning signal, and the use reliability is high.
As shown in fig. 4, the output end of the controller 301 is provided with a wireless communication module 303 for remote control. The wireless communication module 303 can transmit the subsidence value and the output signal of the alarm 302 to an upper computer, and can receive a control command transmitted by the upper computer, so that unmanned remote monitoring is realized, and the cost of input manpower and material resources is low.
As shown in fig. 1 and 4, a display screen 202 is disposed on a surface of the top plate 201, and an input end of the display screen 202 is connected to an output end of the controller 301. The display screen 202 can display the subsidence value and the output signal of the alarm 302 in real time, so that maintenance personnel can conveniently and visually check the running state of the monitoring device.
As shown in fig. 1, the top end of the external threaded cylinder 104 is movably inserted with an insertion rod 105, and the other end of the insertion rod 105 is fixedly connected with the outer bottom surface of the upper base casing 102. The inserted rod 105 is movably inserted into the external thread cylinder 104, so that the relative circumferential rotation between the adjacent base casing cylinders 102 can be limited, and the use stability of the monitoring device is enhanced.
As shown in fig. 2, an inner wall of the base casing 102 is provided with an airtight layer 101. The airtight layer 101 can prevent external moist air from entering the base casing 102, so that the devices inside the base casing 102 can operate in a relatively stable environment, and the service life of the monitoring device is prolonged.
As shown in fig. 1 and 2, the outer wall of the base casing 102 is provided with a triangular anchoring ring 112. When the base casing 102 is fixedly mounted with a corresponding sunken layer, the anchoring ring 112 may limit the relative sliding of the base casing 102 with respect to the corresponding sunken layer.
The working process is as follows: vertically installing a monitoring device in a cavity between the ground surface and a goaf bottom plate, and fixing the monitoring device and the sunk layer in a one-to-one correspondence manner through concrete or structural adhesive; when settlement occurs between adjacent settlement layers, the base pile casing 102 on the lower layer slides relative to the base pile casing 102 on the upper layer vertically downwards, so that the fixed bearing plate 107 and the movable bearing plate 109 perform synchronous deviation movement, the rope 111 slides between the fixed pulleys 110, the tensile displacement sensor 108 measures the movement amount of the rope 111, the movement amount and the set number of displacement sections are calculated to obtain settlement values between the adjacent settlement layers, and the displacement amount between the spaced settlement layers can be obtained by directly superposing the settlement values of the adjacent settlement layers; after the primary settlement numerical value monitoring is completed, the controller 301 controls the driving motor 103 to be started, and the driving motor 103 drives the external thread cylinder 104 to rotate, so that the movable bearing plate 109 vertically moves upwards to recover to an initial state, and the displacement between the settlement layers can be conveniently and accurately measured repeatedly.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. A mining subsidence area settlement monitoring device comprises a top plate (201) fixed relative to the ground, a base pile casing (102) sleeved from top to bottom in sequence, and is characterized by further comprising a controller (301), and a fixed bearing plate (107) and a movable bearing plate (109) which are both positioned in the base pile casing (102); the top end of the base protection cylinder (102) is provided with an opening, and the bottom end is closed; the opposite surfaces of the fixed bearing plate (107) and the movable bearing plate (109) are respectively provided with at least one fixed pulley (110), and a rope (111) forming at least two displacement sections is wound on the fixed pulley (110) between the fixed bearing plate (107) and the movable bearing plate (109); one end of the rope (111) is fixedly connected with the fixed bearing plate (107) or the movable bearing plate (109), and the other end of the rope is fixedly connected with the fixed bearing plate (107) or the movable bearing plate (109) through the tensile displacement sensor (108); the fixed bearing plate (107) is fixedly connected with the bottom surface of the upper base protective cylinder (102) through a connecting rod (106); at least two external thread cylinders (104) are arranged in the base casing (102), the external thread cylinders (104) are in threaded fit with the movable bearing plate (109), a driving motor (103) is arranged in the base casing (102), and the output end of the driving motor (103) is fixedly connected with the bottom ends of the external thread cylinders (104); the output end of the stretching displacement sensor (108) is electrically connected with the input end of the controller (301), and the output end of the controller (301) is electrically connected with the input end of the driving motor (103);
the driving motor (103) is shut down in response to a zero detection signal of the tension displacement sensor (108).
2. A mining subsidence area subsidence monitoring device as claimed in claim 1, wherein the displacement section is arranged parallel to the axial direction of the base casing (102).
3. The mining subsidence area subsidence monitoring device of claim 1, wherein an alarm (302) is arranged at an output end of the controller (301), the controller (301) generates an alarm command after outputting a control rotation angle reaching an early warning rotation angle, and the alarm (302) sends out an alarm signal after responding to the alarm command.
4. The mining subsidence area subsidence monitoring device of claim 3, wherein an angle sensor (304) is arranged at an input end of the controller (301), the angle sensor (304) is used for measuring an actual rotation angle of the driving motor (103), the controller (301) generates an early warning command according to a comparison result of the actual rotation angle and an output control rotation angle, and the alarm (302) sends out an early warning signal after responding to the early warning command.
5. The mining subsidence area subsidence monitoring device of claim 1, wherein the output end of the controller (301) is provided with a wireless communication module (303) for remote control.
6. The mining subsidence area subsidence monitoring device of claim 1, wherein a display screen (202) is arranged on the surface of the top plate (201), and the input end of the display screen (202) is connected with the output end of the controller (301).
7. The mining subsidence area subsidence monitoring device of claim 1, wherein an insert rod (105) is movably inserted at the top end of the external thread cylinder (104), and the other end of the insert rod (105) is fixedly connected with the outer bottom surface of the upper base protective cylinder (102).
8. The mining subsidence area subsidence monitoring device of claim 1, wherein the inner wall of the base casing (102) is provided with an airtight layer (101).
9. A mining subsidence area subsidence monitoring device as claimed in claim 1, wherein the outer wall of the base casing (102) is provided with a triangular anchoring ring (112).
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| CN104452726A (en) * | 2014-12-04 | 2015-03-25 | 浙江广川工程咨询有限公司 | Deep water region soil mass layered settlement monitoring device and method |
| CN105783854A (en) * | 2016-03-07 | 2016-07-20 | 辽宁工程技术大学 | Overlaying strata movement and deformation monitoring system after coal mine goaf filling |
| CN106908033A (en) * | 2017-04-11 | 2017-06-30 | 山东科技大学 | A kind of goaf top plate multi-point displacement synchronous measuring apparatus and its measuring method |
| CN108590766A (en) * | 2018-04-20 | 2018-09-28 | 程刚 | A kind of depression of coal mine gob overlying warp damage rock stratum monitors system |
| CN210341868U (en) * | 2019-06-25 | 2020-04-17 | 机械工业勘察设计研究院有限公司 | In-situ soil body layered settlement monitoring device |
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