CN202562406U - Mining fissure monitoring device - Google Patents
Mining fissure monitoring device Download PDFInfo
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- CN202562406U CN202562406U CN2012201961619U CN201220196161U CN202562406U CN 202562406 U CN202562406 U CN 202562406U CN 2012201961619 U CN2012201961619 U CN 2012201961619U CN 201220196161 U CN201220196161 U CN 201220196161U CN 202562406 U CN202562406 U CN 202562406U
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- base station
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- monitoring device
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- leveling pedestal
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Abstract
The utility model discloses a mining fissure monitoring device which comprises a pointer device and a numerical reading device, wherein the pointer device comprises a first base station rod and a numerical reading pointer connected to the upper end of the first base station rod, the numerical reading device comprises a second base station rod and a grid numerical reading plate connected to the upper end of the second base station rod, the first base station rod and the second base station rod are correspondingly installed on two sides of a mining fissure, and the numerical reading pointer is straightly projected on the grid numerical reading plate. The mining fissure monitoring device can directly reflect the width and fall difference of fissures, and provides simple device for persistent fissure monitoring work.
Description
Technical field
The utility model relates to a kind of soil and environment monitoring device, relates in particular to a kind of monitoring device of adopting the crack.
Background technology
According to relevant statistics; Coal in China exploitation total amount had reached 3,000,000,000 tons in 2010; Coal mining provides energy source and power for China's economic construction, but has also caused the damage of regional interior land ecology environment, and the ground fissure that surface deformable and cracking form then is a kind of common form of expression.Show according to correlative study; The soil moisture loss has been aggravated in the crack in the process that the face of land exists, cause the obvious reduction of water cut in the scope of the particularly shallow face of land of its surrounding soil; The factor of porosity of the soil of both sides, crack is not more damaged the zone and is increased and soil weight reduction; The soil infiltration degree of depth, average infiltration rate also generally increase, thereby also directly cause the water holding capacity of shallow surface soil to descend, and influence the growth of plant.
At present; Carry out less relatively in the coal field monitoring that intrabasinal crack develops data of sinking; Usually the monitoring means that adopts is Detection Techniques and GPS technology such as on-the-spot directly monitoring, INSAR or CR-INSAR, 3 D laser scanning; Utilize INSAR technology, adopt ground fissure according to deformation decoherence characteristic, the differential interferometry figure through Filtering Processing extracts the positional information in crack versatilely; Utilize 3 D laser scanning to form cloud data, according to the distribution characteristics of the information extraction ground fissure of the function model yardstick details sudden change of wavelet analysis technology; Utilize the relevant data information of GPS technical monitoring ground fissure Recent Activity; In directly monitoring at the scene; Relevant scholar also studies the harvester of gap observation; IGG-1 type mechanical type slit gauge is for example laid concrete stake at the two ends, crack, utilizes measuring staff to measure the relative shift of the opening of both sides, crack, the horizontal changing of the relative positions and 3 directions of the vertical changing of the relative positions.
Adopt the growth change situation in the crack, monitoring sinking basin of above-mentioned Crack Monitoring system; Effect is no doubt good; But the development and maintenance cost of system is higher relatively, utilizes INSAR, 3 D laser scanning and GPS technology, can monitor the distribution of cracks state; For the slight change of the differentiation data in crack especially crack, workplace the place ahead also difficulty relatively; The laying job costs of IGG-1 type mechanical type slit gauge are also bigger, and in work progress, also are difficult to guarantee the parastate that is in of two ends measuring staff, influence monitoring effect.In addition; The many states that occur front and back based on the crack of present device; Careful research for soil injuring rule in the crack growth change procedure does not relate to; The monitoring that the space-time from producing closed overall process in crack develops data is the important component part of research soil injuring rule, adopts which kind of economical and practical device and equipment to obtain the ground fissure delta data and seems particularly important, needs to be resolved hurrily.
The utility model content
To the problems of the prior art, the purpose of the utility model provides a kind of monitoring device of adopting the crack, and it can directly reflect fracture width and drop, for crack continuation monitoring provides simple device.
For realizing above-mentioned purpose, the utility model has been taked following technical scheme:
The monitoring device of adopting the crack that the utility model provides comprises indicator device and reading device, wherein:
Said indicator device comprises the first base station bar and is connected the reading pointer of bar upper end, said first base station;
Said reading device comprises the second base station bar and is connected the grid reading dial of bar upper end, said second base station;
The said first base station bar and the second base station bar are being adopted the corresponding installation in both sides, crack, and the orthogonal projection of said reading pointer is in the grid reading dial.
Further, also be provided with the first leveling pedestal between said first base station bar and the said reading pointer; Also be provided with the second leveling pedestal between said second base station bar and the said grid reading dial, the said first leveling pedestal or the second leveling pedestal comprise top plate and bottom plate, wherein:
Said top plate is connected through the WidFin bolt with said bottom plate;
Also be provided with spirit lever on the said top plate, be used to judge the horizontal level of the first leveling pedestal or the second leveling pedestal.
Further, also be connected with the first direct-connected extension bar between said first leveling pedestal and the said reading pointer in turn and turn connecting link, wherein, the said connecting link that turns is 90 ° of bendings.
Further, also be connected with the second direct-connected extension bar between the second leveling pedestal and the grid reading dial.
Further, said top plate is provided with the last connecting pipe that socket-connects with the said first direct-connected extension bar or the second direct-connected extension bar, and said bottom plate is provided with the following connecting pipe that socket-connects with the first base station bar or the second base station bar.
Further, the upper end of the said first base station bar is connected through bolt with the following connecting pipe of the first leveling pedestal; The last connecting pipe of the first leveling pedestal is connected through bolt with the lower end of the first direct-connected extension bar; The upper end of the first direct-connected extension bar is connected through bolt with the perpendicular ends that turns connecting link; The level end that turns connecting link is connected through bolt with the top of reading pointer;
The upper end of the second base station bar is connected through bolt with the following connecting pipe of the second leveling pedestal; The last connecting pipe of the second leveling pedestal is connected through bolt with the lower end of the second direct-connected extension bar; The upper end of the second direct-connected extension bar is connected through bolt with the right side of grid reading dial.
Further, the said first base station bar and the second base station bar have most advanced and sophisticated bottom, and the top is provided with the supplemental support dish.
Further, said reading pointer comprises Collapsible structure and is connected the terminal pointer of Collapsible structure that the top of said Collapsible structure is connected with the level that turns connecting link is terminal.
Further, said grid reading dial mark has one or both in horizontal scale and the vertical scale.
Further, the said connecting link level end that turns is provided with first connecting hole, and said grid reading dial top is provided with second connecting hole; Also be provided with windproof static line in the said device, said windproof static line comprises non-telescoping rope, and an end of said rope connects crooked chisel, is used for fixing with the ground intercalation; But the other end of said rope connects the circular connector with closing any opening, is used for being connected with said first connecting hole or said second connecting hole, can connect one or more said rope on the said circular connector.
The monitoring device of adopting the crack that the utility model provides not only can directly reflect fracture width and drop; And simple in structure, be convenient to the operator and carry out dismounting voluntarily according to the actual observation condition, also can only keep the base station bar during practical application; Other assemblies can be monitored the place at other and recycled; Therefore reduced the quantity of monitoring device effectively, reduced the cost that device uses, for crack continuation monitoring provides simple device.
Description of drawings
Fig. 1 is a kind of structural representation of preferably adopting the monitoring device in crack of the utility model;
Fig. 2 is a vertical view of adopting the monitoring device in crack shown in Figure 1;
Fig. 3 is a left view of adopting the monitoring device in crack shown in Figure 1;
Fig. 4 is base station bar structural representation in the monitoring device of adopting the crack shown in Figure 1;
Fig. 5 a is a reading pointer structure synoptic diagram in the monitoring device of adopting the crack shown in Figure 1;
Fig. 5 b is the local A enlarged drawing of reading pointer shown in Fig. 5 a;
Fig. 6 a is a grid reading dial structural representation in the monitoring device of adopting the crack shown in Figure 1;
Fig. 6 b is the local B enlarged drawing of grid reading dial shown in the 6a;
Fig. 7 a is a leveling base construction synoptic diagram in the monitoring device of adopting the crack shown in Figure 1;
Fig. 7 b is the top plate structural representation of leveling pedestal shown in the 7a;
Fig. 7 c is the bottom plate structure synoptic diagram of leveling pedestal shown in the 7a;
Fig. 8 for leveling pedestal in the monitoring device of adopting the crack shown in Figure 1 respectively with base station bar and direct-connected extension bar socket synoptic diagram;
The structural representation of the windproof static line of the monitoring device that Fig. 9 preferably adopts the crack for the utility model is a kind of.
Embodiment
Below in conjunction with accompanying drawing, a preferred embodiment of the utility model is done detailed description.
Shown in Fig. 1-3, the utility model provides a kind of monitoring device of adopting the crack, and it comprises indicator device 1 and reading device 2, wherein:
The first base station bar 31 and the second base station bar 32 are being adopted the corresponding installation in both sides, crack, and make 4 orthogonal projection of reading pointer in grid reading dial 5.
Owing to running into fine and close soil layer often, this monitoring device of laying is difficult to the base station bar is embedded in the darker soil layer; Therefore the first base station bar 31 in the present embodiment and the second base station bar 32 preferably are provided with most advanced and sophisticated bottom 311 and 321; Certainly; Consider the needs of a whole set of monitoring device stability and different geologic conditions, the utility model also can be processed into any suitable fixed sturcture with its bottom, and is not limited to most advanced and sophisticated bottom.In addition, as shown in Figure 4, the top of the first base station bar 31 and the second base station bar 32 also is respectively arranged with supplemental support dish 312 and 322 in the present embodiment, is used for the supplemental support first leveling pedestal 61.At last, consider the portability of package unit, the first base station bar 31 of the utility model and the second base station bar 32 are 1.2～1.5m with length preferably; Diameter is 20mm, the right cylinder preparation of the stainless steel hollow of thickness 2～3mm, in addition; Do not receive the corrosion of soil and air for the ease of the depth of burying roughly of directly judging the base station bar in actual use and protection base station bar, its outside can also apply rust protection paint, and for example applying spacing is 10cm; Rust protection paint red and white if need not do estimation to the degree of depth of base station bar embedding soil layer, also can apply the rust protection paint of solid color; To simplify technology, practice thrift cost.
The concrete structure of the first leveling pedestal 61 such as Fig. 7 a-7c and shown in Figure 8 in the present embodiment; The first leveling pedestal 61 comprises top plate 611 and bottom plate 612; Wherein, Top plate 611 is connected through WidFin bolt 63 with bottom plate 612, also is provided with spirit lever 64 on the top plate 611, is used to judge the horizontal level of the first leveling pedestal 61; In addition; Top plate 611 centers correspondingly are provided with connecting pipe 65; Bottom plate 612 centers are provided with down connecting pipe 66, and the last connecting pipe 65 and first direct-connected extension bar 81 sockets are also fixing through bolt 9, the first base station bar 31 and following connecting pipe 66 sockets and fixing through bolt 9.A kind of preferred version as the utility model; Shown in Fig. 7 a; Said top plate 611 can be two parallel pie metal dish with bottom plate 612, and 3 the WidFin bolts 63 that preferably between the pie metal dish, evenly distribute, and the said connecting pipe 65 of going up is preferably the cylindrical metal bar with following connecting pipe 66; Its external diameter just can be embedded in respectively in the first direct-connected extension bar 81 and the first base station bar 31, so that socket-connect with the first direct-connected extension bar 81 and the first base station bar 31.Certainly, the utility model is not limited to above-mentioned syndeton and connected mode, can also adopt other syndeton known in those skilled in the art or connected mode, like buckle connection, welding etc.The effect of introducing the first leveling pedestal 61 and the second leveling pedestal 62 in the present embodiment is that the certain level scale mark of regulating reading pointer 4 and grid reading dial 5 is in horizontality, reduces device to greatest extent at the fixedly rough error of original state because of existing angle to introduce to observation data.Therefore, if when just bigness scale fracture width and drop or physical features are enough smooth, in this monitoring device the leveling pedestal can be installed.
Like Fig. 1-3 and shown in Figure 8, connecting link 7 and direct-connected extension bar 81 are turned between the reading pointer 4 and the first leveling pedestal 61, having introduced of the utility model, between 62 connections of the second leveling pedestal and grid reading dial 5, introduce direct-connected extension bar 82.Direct-connected extension bar 81, direct-connected extension bar 82 and turn the dirigibility that connecting link 7 is used to increase monitoring device are convenient to the operator height and the angle of adjusting gear according to actual needs.In the actual monitoring process, if fracture interval is enough little and physical features is smooth, the present invention can be provided with direct-connected extension bar 81 and 82 and turn connecting link 7 in device.As a kind of preferred version of the utility model, direct-connected extension bar 81 is that 20cm, wall thickness are the stainless-steel tube of 1.5～2.5mm with direct-connected extension bar 82 length.Turning connecting link 7 is that 10cm, external diameter are that the stainless-steel tube of 10mm cylindrical shape is formed by two length preferably, and two stainless-steel tubes at right angles connect, and wall thickness is preferably 1.5～2.5mm.
The upper end of the first base station bar 31 is fixedly connected through bolt 9 with the following connecting pipe 66 of the first leveling pedestal 61 in the utility model; The last connecting pipe 65 of the first leveling pedestal 61 is fixedly connected through bolt 9 with the lower end of the first direct-connected extension bar 81; The upper end of the first direct-connected extension bar 81 with turn connecting link 7 perpendicular ends and be fixedly connected through bolt 9; Turning connecting link 7 levels end is fixedly connected through bolt 9 with the top of reading pointer 4; The upper end of the second base station bar 32 is connected through bolt with the following connecting pipe of the second leveling pedestal 62; The last connecting pipe of the second leveling pedestal 62 is fixedly connected through bolt 9 with the second direct-connected lower end that connects 82 bars; The upper end of the second direct-connected extension bar 82 is connected through bolt with the right side of grid reading dial 5.It is thus clear that the effect of bolt 9 is dismounting of convenient a whole set of monitoring device, it helps monitoring device stability in use.In the present embodiment, said bolt material is preferably cast iron or stainless steel, considers the size of other member, and the diameter of bolt is preferably 5mm.
In order to prevent that strong wind weather from causing skew to reading pointer and grid reading dial, influences observed result.Also be provided with windproof static line 10 as shown in Figure 9 in the said device; Said windproof static line 10 comprises non-telescoping rope 101; Rope 101 is preferably and is difficult for flexible nylon rope; One end of said rope 101 connects crooked chisel 102, is used for fixing with the ground intercalation, and crooked chisel length is preferably 50～100cm; But the other end of said rope 101 connects the circular connector 103 with closing any opening; In order to be connected with said windproof static line 10; Turn connecting link 7 level ends first connecting hole is set; Grid reading dial 5 tops are provided with second connecting hole, and circular connector 103 is connected with said first connecting hole or said second connecting hole, thereby realize windproof static line and turn being fixedly connected of connecting link 7 and grid reading dial 5.It should be noted, can connect one or more rope 101 on the circular connector 103, consider the cost problem, the circular connector 103 of present embodiment preferably connects 2 ropes 101.
According to the monitoring device of adopting the crack that the foregoing description provides, its method of application is following:
1. lay the first base station bar and the second base station bar: according to the distribution of monitoring ground fissure; Choosing the face of land characterizes obvious relatively and laying base station, the comparatively simple place of topography and geomorphology bar; The principle of laying is following: the laying of base station bar can not influence the original state in crack; Can not be too far away and cause face of land horizontal distortion and initial error that observation data is brought apart from the crack, so the distance between base station, both sides bar and the crack should be controlled at 10～15cm, the line near normal of base station bar is main body in the crack.Utilize mallet to knock and make it vertically to embed the face of land, embed the red and white mark of the degree of depth on the face of land, be about 1.0m with reference to the body of rod.
2. lay the leveling pedestal: the following connecting pipe of leveling pedestal bottom plate is embedded in the bar of base station, and is fixed with bolt, the usage level trimming bolt makes the bubble in the spirit lever placed in the middle, and this moment, the leveling pedestal at two ends was in horizontality.
3. lay direct-connected extension bar and turn connecting link: on the last connecting pipe that direct-connected extension bar is sheathed on the leveling pedestal as shown in Figure 8, and will turn connecting link and link to each other, and be fixed with associated bolt with direct-connected extension bar.
4. lay grid reading dial and reading pointer: at first the grid reading dial is linked to each other with direct-connected extension bar and fix on the right side of device; Secondly with the reading pointer with turn connecting link and be fixedly connected; The reading indicator device can stretch, according to the length of the collapsible structure of distance adjustment of reading pointer and grid reading dial.Generally, the width in crack and both sides drop are less during the original state of crack, along with the propelling meeting of workplace increases gradually; Final stage is the phenomenon of closure fully; And physical features decline can occur with a side soil of advance of the face direction, be the effective usable range that enlarges the grid reading dial, regulates the reading pointer; Make its projection drop on the upper right side on the dish at the grid reading dial; Write down collapsible structural reading (after installing the laying of dismounting again from now on, when continuing to monitor work, keeping the initial observation term harmonization).Fixing all members are accomplished all laying work of this device, and at this moment, pointer is parallel with the certain level scale mark of grid reading dial in the projection of reading to coil, and the data of record projection end points are as the initial contrasting data of the differentiation information in crack.
5. field monitoring and reading:, arrange monitoring frequency, when carrying out field observation according to the variation of distance between workplace and the monitoring target; Observation personnel's sight line should be on the same surface level with the reading pointer as far as possible; According to the projection of reading pointer end points on the grid reading dial, write down the last reading of its horizontal scale line and vertical scale mark, estimate and read 0.1mm; Continue to monitor, can obtain the differentiation data of crack in the overall process of growth and variation.Have under the dust storm observation condition; Can with among the circular connector 103 of windproof static line 10 and Fig. 1 turn connecting link 7 and grid reading dial 5 links to each other; With mallet crooked chisel 102 is embedded in the soil then, the installation of whole process should be avoided the influence to whole device virgin state as far as possible.
To sum up, the device that the utility model provides can carry out dismounting according to the field observation condition; Can only keep the base station bar during practical application, other assemblies can be monitored the place at other and recycled, and are easy to carry; Reduce on-the-spot control and instrument quantity effectively, the cost that lowering apparatus uses.In addition; This device can also be avoided because of showing the influence that brings to the observation personnel of reinventing that native fragmentation causes the crack state effectively; And in device, introduce the leveling pedestal; Can make the certain level scale mark of reading pointer and grid reading dial be in horizontality; Reduce monitoring device fixedly rough error because of existing angle to introduce under original state to greatest extent, therefore through continuing to monitor the differentiation characteristic that record can obtain geological information in crack delta data and the reflection ground fissure growth course exactly to observation data.At last, this device has been simplified observation procedure, has reduced operating personnel, can realize continuous monitoring, raises the efficiency.
The foregoing description only supplies to explain the usefulness of the utility model; And be not to be the restriction to the utility model; The those of ordinary skill in relevant technologies field under the situation of spirit that does not break away from the utility model and scope, can also be made various variations and modification; Therefore all technical schemes that are equal to also should belong to the category of the utility model, and the scope of patent protection of the utility model should be limited each claim.
Claims (10)
1. adopt the Crack Monitoring device for one kind, it is characterized in that, comprise indicator device and reading device, wherein:
Said indicator device comprises the first base station bar and is connected the reading pointer of bar upper end, said first base station;
Said reading device comprises the second base station bar and is connected the grid reading dial of bar upper end, said second base station;
The said first base station bar and the second base station bar are being adopted the corresponding installation in both sides, crack, and the orthogonal projection of said reading pointer is in the grid reading dial.
2. the Crack Monitoring device of adopting according to claim 1 is characterized in that, also is provided with the first leveling pedestal between said first base station bar and the said reading pointer; Also be provided with the second leveling pedestal between said second base station bar and the said grid reading dial, the said first leveling pedestal or the second leveling pedestal comprise top plate and bottom plate, wherein:
Said top plate is connected through the WidFin bolt with said bottom plate;
Also be provided with spirit lever on the said top plate, be used to judge the horizontal level of the first leveling pedestal or the second leveling pedestal.
3. the Crack Monitoring device of adopting according to claim 2 is characterized in that, also is connected with the first direct-connected extension bar between said first leveling pedestal and the said reading pointer in turn and turns connecting link, and wherein, the said connecting link that turns is 90 ° of bendings.
4. the Crack Monitoring device of adopting according to claim 2 is characterized in that, also is connected with the second direct-connected extension bar between said second leveling pedestal and the said grid reading dial.
5. according to each described Crack Monitoring device of adopting of claim 2-4; It is characterized in that; Said top plate is provided with the last connecting pipe that socket-connects with the said first direct-connected extension bar or the second direct-connected extension bar, and said bottom plate is provided with the following connecting pipe that socket-connects with the first base station bar or the second base station bar.
6. the Crack Monitoring device of adopting according to claim 5 is characterized in that, the upper end of the said first base station bar is connected through bolt with the following connecting pipe of the first leveling pedestal; The last connecting pipe of the first leveling pedestal is connected through bolt with the lower end of the first direct-connected extension bar; The upper end of the first direct-connected extension bar is connected through bolt with the perpendicular ends that turns connecting link; The level end that turns connecting link is connected through bolt with the top of reading pointer;
The upper end of the second base station bar is connected through bolt with the following connecting pipe of the second leveling pedestal; The last connecting pipe of the second leveling pedestal is connected through bolt with the lower end of the second direct-connected extension bar; The upper end of the second direct-connected extension bar is connected through bolt with the right side of grid reading dial.
7. the Crack Monitoring device of adopting according to claim 1 is characterized in that, the said first base station bar and the second base station bar have most advanced and sophisticated bottom, and the top is provided with the supplemental support dish.
8. the Crack Monitoring device of adopting according to claim 3 is characterized in that, said reading pointer comprises Collapsible structure and be connected the terminal pointer of Collapsible structure that the top of said Collapsible structure is connected with the level that turns connecting link is terminal.
9. the Crack Monitoring device of adopting according to claim 1 is characterized in that, said grid reading dial mark has one or both in horizontal scale and the vertical scale.
10. the Crack Monitoring device of adopting according to claim 3 is characterized in that, the said connecting link level end that turns is provided with first connecting hole, and said grid reading dial top is provided with second connecting hole;
Also be provided with windproof static line in the said device, said windproof static line comprises non-telescoping rope, and an end of said rope connects crooked chisel, is used for fixing with the ground intercalation; But the other end of said rope connects the circular connector with closing any opening, is used for being connected with said first connecting hole or said second connecting hole, can connect one or more said rope on the said circular connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201961619U CN202562406U (en) | 2012-04-28 | 2012-04-28 | Mining fissure monitoring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201961619U CN202562406U (en) | 2012-04-28 | 2012-04-28 | Mining fissure monitoring device |
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| CN202562406U true CN202562406U (en) | 2012-11-28 |
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| CN2012201961619U Expired - Lifetime CN202562406U (en) | 2012-04-28 | 2012-04-28 | Mining fissure monitoring device |
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| CN103822562A (en) * | 2014-02-20 | 2014-05-28 | 重庆市排水有限公司 | Chlorination contact pool expansion joint monitoring device |
| CN105066948A (en) * | 2015-08-21 | 2015-11-18 | 四川隧唐科技股份有限公司 | Remote and real-time concrete crack monitoring system |
| CN106595497A (en) * | 2017-01-23 | 2017-04-26 | 中车建设工程有限公司 | Building surface crack real-time monitoring and early warning system and early warning method thereof |
| CN108981576A (en) * | 2018-06-07 | 2018-12-11 | 重庆工业职业技术学院 | A kind of Simple engineering geology crack measuring device |
| CN110579160A (en) * | 2019-10-12 | 2019-12-17 | 安徽理工大学 | Tension fracture depth and width measuring device and application thereof |
| CN110702050A (en) * | 2019-11-12 | 2020-01-17 | 山东科技大学 | Surface three-dimensional deformation monitoring method based on InSAR |
| CN112129203A (en) * | 2020-09-17 | 2020-12-25 | 黄淮学院 | Continuous observation ruler for building cracks |
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| CN114046708A (en) * | 2021-12-03 | 2022-02-15 | 上海嘉麟杰纺织科技有限公司 | Device for measuring width of fabric grid |
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2012
- 2012-04-28 CN CN2012201961619U patent/CN202562406U/en not_active Expired - Lifetime
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| CN113739756A (en) * | 2021-08-18 | 2021-12-03 | 安徽建筑大学 | Coal mining subsidence ground crack height difference measuring device and method |
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| CN116045769A (en) * | 2023-03-06 | 2023-05-02 | 山东省鲁南地质工程勘察院(山东省地质矿产勘查开发局第二地质大队) | Ground crack measuring system for coal mining subsidence area |
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