CN117781818A - Building vertical structure seam width change monitoring device and monitoring method thereof - Google Patents
Building vertical structure seam width change monitoring device and monitoring method thereof Download PDFInfo
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- CN117781818A CN117781818A CN202410217644.XA CN202410217644A CN117781818A CN 117781818 A CN117781818 A CN 117781818A CN 202410217644 A CN202410217644 A CN 202410217644A CN 117781818 A CN117781818 A CN 117781818A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000012806 monitoring device Methods 0.000 title claims abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 34
- 230000000737 periodic effect Effects 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 5
- 230000000007 visual effect Effects 0.000 claims description 5
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 4
- 239000004917 carbon fiber Substances 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 4
- 239000003365 glass fiber Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000010985 leather Substances 0.000 claims description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 4
- 239000004033 plastic Substances 0.000 claims description 4
- 229920003023 plastic Polymers 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of measurement, and particularly relates to a device and a method for monitoring the width change of a building vertical structure seam. The utility model provides a building vertical structure seam width change monitoring devices, includes seam width measurement scale and scale steering gear, seam width measurement scale one end is the scale stiff end, and the other end is the scale free end, the scale stiff end is fixed in one side of vertical structure seam that awaits measuring, the scale free end level passes vertical downward behind the scale steering gear of vertical structure seam opposite side that awaits measuring, bypassing the vertical structure seam opposite side that awaits measuring, vertical decurrent the tip of scale free end is equipped with the load. The invention has simple structure, convenient operation and strong adaptability, can rapidly realize the monitoring of the vertical structural joint and has low cost.
Description
Technical Field
The invention belongs to the technical field of measurement, and particularly relates to a device and a method for monitoring the width change of a building vertical structure seam.
Background
The structural joint of a building is a technical term of civil engineering, and refers to a general term of expansion joints, settlement joints, shockproof joints and the like arranged between two adjacent buildings or two parts of the building for avoiding the influences of temperature expansion, foundation settlement, earthquake collision and the like on the overall safety of the structure of the building. The structural seam of the building has certain seam width and deformation adaptability, and important components of the integral structure of the building are inevitably subjected to various external forces in the process from construction to use of an actual building, so that the structural seam generates certain stretch-break deformation, and particularly in the field of water conservancy and hydropower engineering, if overlarge deformation is generated, structural seam deformation rules cannot be found in time and measures are taken, water stop damage and the like are likely to be caused, thereby influencing the water stop effect, and the safety of the building can be endangered when serious. Therefore, how to timely, effectively, intuitively and conveniently monitor the joint deformation of the concrete structure becomes an important subject in the construction engineering.
At present, a crack sensor is adopted for monitoring structural joints of a building and the like in real time in combination with a data terminal, the method is widely applied in the industry, but has the advantages of high cost, complex structural layout, complex process flow, unchanged installation and maintenance, once internal equipment is in a problem and cannot be repaired in time, and for many projects, the construction period basically does not have the equipment installation monitoring conditions, so that deformation data of the structural joints in the construction period often does not exist, and deformation rules of the structural joints in the actual construction period are more complex due to the fact that the structural joints in the construction period are more reversely influenced by external factors, so that a device and a monitoring method with simplicity, flexibility, higher adaptability and lower cost are necessary to be found.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the device and the method for monitoring the width change of the building vertical structural seam, and the device for monitoring the width change of the building vertical structural seam is simple in structure, convenient to operate and high in adaptability, can rapidly monitor the vertical structural seam and is low in cost.
The technical scheme of the invention is as follows: the utility model provides a building vertical structure seam width change monitoring devices, includes seam width measurement scale and scale steering gear, seam width measurement scale one end is the scale stiff end, and the other end is the scale free end, the scale stiff end is fixed in one side of vertical structure seam that awaits measuring, the scale free end level passes vertical downward behind the scale steering gear of vertical structure seam opposite side that awaits measuring, bypassing the vertical structure seam opposite side that awaits measuring, vertical decurrent the tip of scale free end is equipped with the load.
The scale stiff end includes the horizontal tray, horizontal tray lower part is equipped with the shape support that returns all around respectively, horizontal tray upper portion is equipped with the spirit level, the one end that seam width measurement scale is close to horizontal tray upper surface is equipped with scale set screw, scale set screw is with seam width measurement scale and horizontal tray upper surface fixed, shape support lower part is equipped with fixing bolt returns, the shape support inside is equipped with the sliding tray returns, be equipped with the regulation pole in the sliding tray, regulation pole upper portion with horizontal tray lower part fixed connection.
The adjusting rod is provided with an adjusting scale mark, and a horizontal bubble, a central line and a central ring are arranged in the level meter.
The seam width measuring scale is a flexible rule, the material of the flexible rule is any one of plastics, cloth, leather, glass fiber or carbon fiber, and the linear expansion coefficient of the seam width measuring scale is not more than 0.1 multiplied by 10 -4 /℃。
The precision of the seam width measuring scale is at least 1mm, and the measuring range is 0-1000 mm.
The scale diverter is a fixed pulley, the rotation axis of the fixed pulley is perpendicular to a building wall body of a vertical structural joint to be detected, the fixed pulley is provided with a fixed mark scale indication line, and the fixed mark scale indication line vertically points to scales of the seam width measurement scale upwards.
The load is iron balls or weights with fixed mass, and the load is used for ensuring that the seam width measuring scale is in a straightening state.
A building vertical structure seam width change monitoring method, which uses the building vertical structure seam width change monitoring device, comprises the following steps:
s1: and (3) mounting a scale diverter: installing a scale diverter at a design position of a building wall body at one side of a vertical structural joint to be detected, wherein the scale diverter is vertical to the wall body;
s2: mounting a seam width measurement scale; fixing the fixed end of the scale on a building wall body at the other side of the vertical structural seam to be detected, wherein the length direction of the seam width measurement scale is required to be perpendicular to the trend direction of the vertical structural seam to be detected, and the seam width measurement scale is required to be kept at the same horizontal height as the horizontal upper tangent line of the existing scale steering device when the seam width measurement scale is naturally horizontally straightened, the free end of the scale horizontally penetrates through the scale steering device and then vertically downwards, and the end part of the free end of the scale vertically downwards is provided with a load so as to ensure that the seam width measurement scale is in a straightening state;
s3: and (3) acquiring and recording the seam width data of the vertical structure to be tested: s, after the installation is completed, recording an initial scale value, wherein the recording adopts a visual monitoring method, shooting and recording data are regularly and regularly carried out every certain time interval, and storing and recording are carried out according to the date and time;
s4: and (3) data processing: and forming a seam width change periodic curve through regular monitoring records, analyzing the seam width change periodic curve, and evaluating the seam change condition of the vertical structure.
The invention has the technical effects that: the invention has simple structure, convenient operation and strong adaptability, can rapidly realize the monitoring of the vertical structural joint and has low cost.
Further description will be made below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of a device for monitoring the variation of the width of a building vertical structural seam according to an embodiment of the present invention.
FIG. 2 is a top view of a fixed end of a scale according to an embodiment of the present invention.
Fig. 3 is a front view of a fixed end of a scale according to an embodiment of the present invention.
Fig. 4 is a top view of a level of an embodiment of the present invention.
Reference numerals: the measuring device comprises a 1-seam width measuring scale, a 2-scale fixed end, a 3-scale steering gear, a 4-scale free end, a 5-loading, a 21-square bracket, a 22-level meter, a 23-level tray, a 24-scale fixing screw, a 211-adjusting rod, a 212-fixing screw, a 213-sliding groove, a 221-level bubble, a 222-central line and a 223-central ring.
Detailed Description
Example 1
As shown in fig. 1-4, the device for monitoring the change of the width of the building vertical structure seam comprises a seam width measuring scale 1 and a scale steering device 3, wherein one end of the seam width measuring scale 1 is a scale fixing end 2, the other end of the seam width measuring scale is a scale free end 4, the scale fixing end 2 is fixed on one side of the vertical structure seam to be tested, the scale free end 4 horizontally penetrates through the vertical structure seam to be tested and bypasses the scale steering device 3 on the other side of the vertical structure seam to be tested, then vertically downward is carried out, and the end part of the scale free end 4 vertically downward is provided with a load 5.
In the actual use process, the scale diverter 3 is arranged at the design position of the building wall body at one side of the vertical structural joint to be detected, and the scale diverter 3 is vertical to the wall body; fixing a scale fixing end 2 on a building wall body at the other side of a vertical structural joint to be detected, wherein the length direction of a joint width measuring scale 1 is required to be perpendicular to the trend direction of the vertical structural joint to be detected, and the joint width measuring scale 1 is required to be kept at the same horizontal height with the horizontal upper tangent line of the traditional scale steering device 3 when being naturally horizontally straightened, a scale free end 4 horizontally penetrates through the scale steering device 3 and then vertically downwards, and a load 5 is arranged at the end part of the scale free end 4 vertically downwards to ensure that the joint width measuring scale 1 is in a straightening state; after the installation is finished, recording an initial scale value, taking the recorded data periodically and regularly at intervals by adopting a visual monitoring method, and storing and recording according to the date and time; and forming a seam width change periodic curve through regular monitoring records, analyzing the seam width change periodic curve, and evaluating the seam change condition of the vertical structure. The invention has simple structure, convenient operation and strong adaptability, can rapidly realize the monitoring of the vertical structural joint and has low cost.
Example 2
Preferably, in this embodiment, on the basis of embodiment 1, preferably, the scale fixing end 2 includes a horizontal tray 23, a loop-shaped bracket 21 is disposed around the lower portion of the horizontal tray 23, a level gauge 22 is disposed on the upper portion of the horizontal tray 23, a scale fixing screw 24 is disposed at one end of the slit width measuring scale 1 near the upper surface of the horizontal tray 23, the scale fixing screw 24 fixes the slit width measuring scale 1 and the upper surface of the horizontal tray 23, a fixing bolt 212 is disposed on the lower portion of the loop-shaped bracket 21, a sliding groove 213 is disposed inside the loop-shaped bracket 21, an adjusting rod 211 is disposed in the sliding groove 213, and an upper portion of the adjusting rod 211 is fixedly connected with the lower portion of the horizontal tray 23.
In the actual use process, the invention fixes the square bracket 21 on the wall of the building through the fixing bolt 212, controls and adjusts the adjusting rod 211 in the sliding groove 213 through the level gauge 22, so that the horizontal tray 23 keeps horizontal, and the scale fixing screw 24 fixes the seam width measuring scale 1 and the upper surface of the horizontal tray 23, thereby ensuring accurate monitoring of the vertical structural seam.
Example 3
Preferably, in this embodiment, on the basis of embodiment 1 or embodiment 2, it is preferable that an adjusting scale line is provided on the adjusting lever 211, and a horizontal bubble 221, a central line 222 and a central ring 223 are provided in the level 22.
In actual use, the adjusting rod 211 of the invention is provided with adjusting graduation marks, which is convenient for accurate adjustment, the level gauge 22 is internally provided with a horizontal bubble 221, a central line 222 and a central ring 223, and when the horizontal bubble 221 moves into the central ring 223, the horizontal tray 23 keeps horizontal.
Example 4
Preferably, in the present embodiment, based on embodiment 1 or embodiment 3, preferably, the seam width measurement scale 1 is a flexible rule, the material of the flexible rule is any one of plastic, cloth, leather, glass fiber or carbon fiber, and the coefficient of linear expansion of the seam width measurement scale 1 is not greater than 0.1x10 -4 /℃。
In actual use, the seam width of the inventionThe measuring scale 1 is a flexible rule, the flexible rule is made of any one of plastics, cloth, leather, glass fiber or carbon fiber, and the linear expansion coefficient of the seam width measuring scale 1 is not more than 0.1 multiplied by 10 -4 And (3) at the temperature of/DEG C, the tension straightening of the load butt joint width measurement scale is ensured.
Example 5
In the embodiment 1 or 4, the accuracy of the slit width measurement scale 1 is preferably at least 1mm, and the measurement range is preferably 0 to 1000mm.
In the actual use process, the precision of the seam width measuring scale 1 is at least 1mm, so that the monitoring precision is ensured.
Example 6
Preferably, in this embodiment, on the basis of embodiment 1 or embodiment 5, preferably, the scale diverter 3 is a fixed pulley, a rotation axis of the fixed pulley is perpendicular to a building wall body of the vertical structural seam to be tested, the fixed pulley is provided with a fixed mark scale indication line, and the fixed mark scale indication line points to a scale of the seam width measurement scale 1 vertically upwards.
In the actual use process, the scale diverter 3 is a fixed pulley, the rotation axis of the fixed pulley is vertical to a building wall body of a vertical structural joint to be detected, the horizontal arrangement of the joint width measuring scale on one side of the vertical structural joint to be detected is ensured, the fixed pulley is provided with fixed marking scale indication lines, the fixed marking scale indication lines vertically upwards point to scales of the joint width measuring scale 1, and the change condition of the vertical structural joint to be detected can be calibrated.
Example 7
Preferably, in this embodiment, based on embodiment 1 or embodiment 6, the load 5 is preferably a plurality of iron balls or weights with fixed mass, and the load 5 is used to ensure that the slit width measurement scale 1 is in a straightened state.
In the actual use process, the load 5 is a plurality of iron balls or weights with fixed mass, and the load 5 is used for ensuring that the seam width measuring scale 1 is in a straightening state and ensuring the monitoring precision.
Example 8
A building vertical structure seam width change monitoring method, which uses the building vertical structure seam width change monitoring device, comprises the following steps:
s1: the scale diverter 3 is mounted: installing a scale diverter 3 at a design position of a building wall body at one side of a vertical structural joint to be detected, wherein the scale diverter 3 is vertical to the wall body;
s2: mounting a seam width measurement scale 1; fixing a scale fixing end 2 on a building wall body at the other side of a vertical structural joint to be detected, wherein the length direction of a joint width measuring scale 1 is required to be perpendicular to the trend direction of the vertical structural joint to be detected, and the joint width measuring scale 1 is required to be kept at the same horizontal height with the horizontal upper tangent line of the traditional scale steering device 3 when being naturally horizontally straightened, a scale free end 4 horizontally penetrates through the scale steering device 3 and then vertically downwards, and a load 5 is arranged at the end part of the scale free end 4 vertically downwards to ensure that the joint width measuring scale 1 is in a straightening state;
s3: and (3) acquiring and recording the seam width data of the vertical structure to be tested: s2, after the installation is completed, recording an initial scale value, wherein the recording adopts a visual monitoring method, shooting and recording data are regularly and regularly carried out every certain time interval, and storage and recording are carried out according to the date and time;
s4: and (3) data processing: and forming a seam width change periodic curve through regular monitoring records, analyzing the seam width change periodic curve, and evaluating the seam change condition of the vertical structure.
Example 9
With a building vertical structural seam width variation monitoring method as described in embodiment 8, using a building vertical structural seam width variation monitoring apparatus as described in embodiment 1, for XX building vertical structural seam width, comprising the steps of:
s1: the scale diverter 3 is mounted: mounting a scale diverter 3 at a design position of a building wall at one side of a vertical structural joint to be detected of the XX building, wherein the scale diverter 3 is vertical to the wall;
s2: mounting a seam width measurement scale 1; fixing a scale fixing end 2 on a building wall body at the other side of a vertical structural joint to be detected, wherein the length direction of a joint width measuring scale 1 is required to be perpendicular to the trend direction of the vertical structural joint to be detected, and the joint width measuring scale 1 is required to be kept at the same horizontal height with the horizontal upper tangent line of the traditional scale steering device 3 when being naturally horizontally straightened, a scale free end 4 horizontally penetrates through the scale steering device 3 and then vertically downwards, and a load 5 is arranged at the end part of the scale free end 4 vertically downwards to ensure that the joint width measuring scale 1 is in a straightening state;
s3: and (3) acquiring and recording the seam width data of the vertical structure to be tested: s2, recording initial scale values after the installation is finished, wherein the recording can be realized by adopting a visual monitoring method or adding an automatic observation infrared recorder to lighten the manual workload, and the manual reading or the recording data shooting are regularly carried out at regular intervals, and the recording is carried out according to the date and time;
s4: and (3) data processing: and forming a seam width change periodic curve through regular monitoring records, analyzing the seam width change periodic curve, and evaluating the seam change condition of the vertical structure. The specific process is as follows:
the numerical value of the fixed scale indication line of the initial horizontal flexible rule measured at a certain initial moment is 355mm, the three continuous measurement values of 356mm,356mm and 356mm at the same interval time step by step are respectively equal to delta L 1 =ΔL 2 =ΔL 3 =1mm, then the crack width variation is illustrated as a trend of uniform expansion;
the numerical value of the fixed scale indication line of the initial horizontal flexible rule measured at a certain initial moment is 355mm, the three continuous measurement values of the same time interval are 354mm,353mm and 355mm respectively, and the three interval differences are delta L 1 =ΔL 2 =ΔL 3 -1mm, then the crack width variation is illustrated as a trend of uniform shrinkage;
the numerical value of the fixed scale indication line of the initial horizontal flexible rule measured at a certain initial moment is 355mm, the three continuous measurement values at equal time intervals are 356mm,356mm and 361mm respectively, and the three interval differences are delta L 1 =1mm，ΔL 2 =2mm，ΔL 3 =3mm, then the crack width variation is illustrated as a trend of accelerating propagation;
the numerical value of the indication line of the fixed scale of the initial horizontal flexible rule is 355mm measured at a certain initial moment, and the steps are connected at the same time intervalThe three times of measurement are respectively 354mm,352mm and 349mm, and the three times of interval difference values are all delta L 1 =-1mm，ΔL 2 =-2mm，ΔL 3 -3mm, then the crack width variation is illustrated as being in a tendency to accelerate shrinkage;
the numerical value of the fixed scale indication line of the initial horizontal flexible rule measured at a certain initial moment is 355mm, the three continuous measurement values at equal time intervals are 356mm,356mm and 356mm respectively, and the three continuous measurement values are delta L 1 =1mm，ΔL 2 =0mm，ΔL 3 =0 mm, then this indicates that the crack width variation is in a tendency to stabilize.
The numerical value of the fixed scale indication line of the initial horizontal flexible rule measured at a certain initial moment is 355mm, the three continuous measurement values at equal time intervals are 354mm,354mm and 354mm respectively, and the three interval difference values are delta L 1 =-1mm，ΔL 2 =0mm，ΔL 3 =0 mm, then this indicates that the crack width variation is in a tendency to stabilize.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. The utility model provides a building vertical structure seam width change monitoring devices which characterized in that: including seam width measurement scale (1) and scale steering gear (3), seam width measurement scale (1) one end is scale stiff end (2), and the other end is scale free end (4), scale stiff end (2) are fixed in one side of vertical structure seam that awaits measuring, scale free end (4) level pass vertical downward behind the scale steering gear (3) of vertical structure seam opposite side that awaits measuring, bypassing the vertical decurrent the tip of scale free end (4) is equipped with and loads (5).
2. A building vertical structure seam width variation monitoring device as set forth in claim 1, wherein: the utility model discloses a scale stiff end (2), including horizontal tray (23), horizontal tray (23) lower part is equipped with back shape support (21) all around respectively, horizontal tray (23) upper portion is equipped with spirit level (22), the one end that seam width measurement scale (1) is close to horizontal tray (23) upper surface is equipped with scale set screw (24), scale set screw (24) are fixed seam width measurement scale (1) and horizontal tray (23) upper surface, back shape support (21) lower part is equipped with fixing bolt (212), back shape support (21) inside is equipped with sliding tray (213), be equipped with regulation pole (211) in sliding tray (213), regulation pole (211) upper portion with horizontal tray (23) lower part fixed connection.
3. A building vertical structure seam width variation monitoring device as set forth in claim 2, wherein: the adjusting rod (211) is provided with an adjusting scale mark, and the level gauge (22) is internally provided with a horizontal bubble (221), a central line (222) and a central ring (223).
4. A building vertical structure seam width variation monitoring device as set forth in claim 1, wherein: the seam width measuring scale (1) is a flexible rule, the flexible rule is made of any one of plastic, cloth, leather, glass fiber or carbon fiber, and the linear expansion coefficient of the seam width measuring scale (1) is not more than 0.1 multiplied by 10 -4 /℃。
5. A building vertical structure seam width variation monitoring device as set forth in claim 1, wherein: the precision of the seam width measuring scale (1) is at least 1mm, and the measuring range is 0-1000 mm.
6. A building vertical structure seam width variation monitoring device as set forth in claim 1, wherein: the scale diverter (3) is a fixed pulley, the rotation axis of the fixed pulley is perpendicular to a building wall body of a vertical structural seam to be detected, the fixed pulley is provided with a fixed mark scale indication line, and the fixed mark scale indication line vertically points upwards to scales of the seam width measuring scale (1).
7. A building vertical structure seam width variation monitoring device as set forth in claim 1, wherein: the load (5) is a plurality of iron balls or weights with fixed mass, and the load (5) is used for ensuring that the seam width measuring scale (1) is in a straightening state.
8. A method for monitoring the width change of a building vertical structure seam, which is characterized in that the device for monitoring the width change of the building vertical structure seam is used according to claim 1, wherein: the method comprises the following steps:
s1: and (3) mounting a scale steering gear: installing a scale diverter (3) at a design position of a building wall body at one side of a vertical structural joint to be detected, wherein the scale diverter (3) is vertical to the wall body;
s2: mounting a seam width measuring scale (1); fixing a scale fixing end (2) on a building wall body at the other side of a vertical structure seam to be detected, wherein the length direction of a seam width measuring scale (1) needs to be perpendicular to the trend direction of the vertical structure seam to be detected, and when the seam width measuring scale (1) is naturally and horizontally straightened, the seam width measuring scale (1) needs to be kept at the same horizontal height as the upper horizontal tangent line of the traditional scale steering device (3), and a scale free end (4) vertically and downwards passes through the scale steering device (3) horizontally, and a load (5) is arranged at the end part of the scale free end (4) vertically and downwards to ensure that the seam width measuring scale (1) is in a straightened state;
s3: and (3) acquiring and recording the seam width data of the vertical structure to be tested: s2, after the installation is completed, recording an initial scale value, wherein the recording adopts a visual monitoring method, shooting and recording data are regularly and regularly carried out every certain time interval, and storage and recording are carried out according to the date and time;
s4: and (3) data processing: and forming a seam width change periodic curve through regular monitoring records, analyzing the seam width change periodic curve, and evaluating the seam change condition of the vertical structure.
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| CN202410217644.XA CN117781818A (en) | 2024-02-28 | 2024-02-28 | Building vertical structure seam width change monitoring device and monitoring method thereof |
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| CN202410217644.XA CN117781818A (en) | 2024-02-28 | 2024-02-28 | Building vertical structure seam width change monitoring device and monitoring method thereof |
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| JP2001048436A (en) * | 1999-08-06 | 2001-02-20 | Mitsubishi Electric Building Techno Service Co Ltd | Measuring device for elevator upper and lower end point switch gap |
| KR20010088253A (en) * | 2000-03-11 | 2001-09-26 | 유승룡 | Crack Gauge |
| CN101881592A (en) * | 2010-06-17 | 2010-11-10 | 同济大学 | Self-advancing slide rail pendulous ground fissure deformation monitoring device |
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