CN111141236A - Flatness measuring device and using method thereof - Google Patents
Flatness measuring device and using method thereof Download PDFInfo
- Publication number
- CN111141236A CN111141236A CN202010098588.4A CN202010098588A CN111141236A CN 111141236 A CN111141236 A CN 111141236A CN 202010098588 A CN202010098588 A CN 202010098588A CN 111141236 A CN111141236 A CN 111141236A
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- main scale
- measured
- range finder
- laser
- laser range
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000010276 construction Methods 0.000 abstract description 5
- 230000001276 controlling effect Effects 0.000 description 3
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/30—Measuring arrangements characterised by the use of optical techniques for measuring roughness or irregularity of surfaces
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention relates to a flatness measuring device and a using method thereof, comprising the following steps: the top surface of the main scale is provided with a horizontal bubble, the bottom surface of the main scale is provided with a regulating part which can be regulated in a telescopic way, and the length of the regulating part is correspondingly regulated according to the horizontal bubble so that the main scale is horizontal; and the laser range finder is arranged on the top surface of the main scale and can move and adjust along the length direction of the main scale, and the laser range finder is moved along the main scale and emits laser to the structure to be measured so as to measure the distance between a plurality of groups of main scales and the structure to be measured, so that the flatness of the structure to be measured is obtained through comparison. The invention effectively solves the problem of difficult flatness measurement of the structure to be measured, can ensure the measurement precision and the construction quality, reduces the potential safety hazard and ensures the safety of measuring personnel, and the measuring device has simple structure and is easy to realize.
Description
Technical Field
The invention relates to the field of building construction, in particular to a flatness measuring device and a using method thereof.
Background
The flatness is an important index for detecting the construction quality of concrete structure engineering, and refers to the difference value between the highest point and the lowest point between a surface to be detected and a reference plane.
When the method is used for measuring, actual implementation is difficult, the feeler gauge and the guiding rule are required to be matched for measurement, when the position of the concrete structure is high, such as a floor, the concrete structure is limited by the height of a measuring person, the measurement needs to be carried out by means of equipment such as a ladder, the potential safety hazard is large, in addition, when the surface of the concrete structure is uneven, the measurement is limited by the measuring range of the feeler gauge, and the measurement precision is poor.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a flatness measuring device and a using method thereof, solves the problem of difficulty in flatness measurement of a structure to be measured, can ensure the measuring precision and the construction quality, reduces the potential safety hazard, ensures the safety of measuring personnel, and has a simple structure and easy implementation.
The technical scheme for realizing the purpose is as follows:
the invention provides a flatness measuring device, comprising:
the top surface of the main scale is provided with a horizontal bubble, the bottom surface of the main scale is provided with a regulating part which can be regulated in a telescopic way, and the length of the regulating part is correspondingly regulated according to the horizontal bubble so that the main scale is horizontal; and
install in the main scale top surface and can follow the length direction removal laser range finder who adjusts of main scale, through along the main scale remove laser range finder and to the structure transmission laser that awaits measuring in order to record a plurality of groups main scale and the interval between the structure that awaits measuring to the roughness of structure that awaits measuring is reachd in the contrast.
The invention provides a flatness measuring device, which adjusts a main scale to be horizontal through a horizontal bubble and an adjusting part, when a structure to be measured with a higher position is measured, such as a floor slab, the main scale does not need to be attached to the structure to be measured, the overhead operation of a measurer is reduced, laser is directly emitted to the structure to be measured by using a laser range finder after the main scale is leveled, the laser range finder is moved along the main scale to obtain the distance between a plurality of groups of main scales and the structure to be measured, the flatness of the structure to be measured is obtained after comparison, the problem of difficulty in measuring the flatness of the structure to be measured is solved, the measuring precision and the construction quality can be ensured, in addition, the potential safety hazard is reduced, the safety of the measurer is ensured, and the measuring device is simple in structure and easy to realize.
The flatness measuring device is further improved in that the flatness measuring device further comprises a sliding part arranged on the main scale in a sliding mode, the laser range finder is rotatably arranged on the sliding part, and the laser range finder is adjusted through rotation to change the emitting direction of laser so that the emitted laser vertically emits to the surface of the structure to be measured.
The flatness measuring device is further improved in that a sliding groove is formed in the side of the main ruler;
the sliding part comprises a clamping block clamped in the sliding groove and a connecting plate, one end of the connecting plate is fixedly connected with the clamping block, the other end of the connecting plate is bent towards the direction close to the main scale to form a platform surface opposite to the top surface of the main scale, and the laser range finder is arranged on the platform surface.
The flatness measuring device is further improved in that the cross section of the sliding groove is T-shaped, and the cross section of the clamping block is correspondingly T-shaped.
The flatness measuring device is further improved in that the flatness measuring device further comprises a base, the laser range finder is fixed at the top of the base, and the side part and the bottom of the base are both provided with screw holes;
a screw matched with the screw hole is fixedly arranged on the platform surface;
when the structure to be measured is horizontal, the screw hole positioned at the bottom of the base is connected with the screw rod, so that laser emitted by the laser range finder is vertically emitted to the surface of the structure to be measured;
when the structure to be measured is vertical, utilize the screw that is located the base lateral part to be connected with the screw rod to through the direction rotation base along perpendicular to main scale, make the laser shot of this laser range finder directive to the surface of structure to be measured perpendicularly through the direction of adjusting laser emission.
The flatness measuring device of the present invention is further improved in that the base is cube-shaped.
The flatness measuring device is further improved in that the adjusting piece comprises a fixed pipe, a telescopic rod and a bolt, wherein one end of the fixed pipe is fixed on the bottom surface of the main scale, the telescopic rod is inserted into the fixed pipe, and part of the telescopic rod is exposed out of the other end of the fixed pipe;
the telescopic rod is moved along the fixing pipe to adjust the length of the exposed part of the telescopic rod, and then the bolt is screwed in a screwing mode, so that the end part of the bolt abuts against the telescopic rod to fix the telescopic rod, and the length of the adjusting piece is changed.
The flatness measuring apparatus of the present invention is further improved in that a scale is engraved on the top surface of the main scale.
The invention provides a using method of a flatness measuring device, which comprises the following steps:
providing the measuring device, and placing the measuring device on the ground near the structure to be measured;
correspondingly adjusting the length of the adjusting piece according to the horizontal bubble to enable the main scale to be horizontal;
and starting the laser range finder to vertically emit laser to the surface of the structure to be measured, moving the laser range finder along the main scale, and emitting laser to the structure to be measured through the laser range finder to measure the distance between a plurality of groups of main scales and the structure to be measured, so that the flatness of the structure to be measured is obtained through comparison.
The use method of the flatness measuring device is further improved in that the flatness measuring device further comprises a sliding piece arranged on the main scale in a sliding mode, and the laser range finder is rotatably arranged on the sliding piece;
when the structure to be measured is horizontal, rotating the laser range finder to vertically emit laser to the surface of the structure to be measured, and moving the laser range finder to measure the flatness of the structure to be measured;
when the structure that awaits measuring is vertical form, rotate laser range finder along the direction of perpendicular to main scale so that laser is to the structure transmission that awaits measuring, remove the main scale and make the lateral part laminating of main scale in the structure that awaits measuring, remove laser range finder in order to record the roughness of the structure that awaits measuring.
Drawings
Fig. 1 is a perspective view showing the overall structure of the flatness measuring apparatus according to the present invention.
Fig. 2 is a side sectional view of a main scale portion of the flatness measuring apparatus of the present invention.
Fig. 3 is a side sectional view of a slider portion in the flatness measuring apparatus of the invention.
Fig. 4 is a plan view of a slider portion in the flatness measuring apparatus of the invention.
FIG. 5 is an enlarged perspective view of the base and the laser range finder of the flatness measuring apparatus according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a flatness measuring device and a using method thereof, wherein a main scale is adjusted to be horizontal through a horizontal bubble and an adjusting part, when a structure to be measured with a higher position is measured, such as a floor slab, the main scale does not need to be attached to the structure to be measured, the high-altitude operation of a measuring person is reduced, after the main scale is leveled, laser is directly emitted to the structure to be measured by using a laser range finder, the laser range finder is moved along the main scale to obtain the distance between a plurality of groups of main scales and the structure to be measured, and the flatness of the structure to be measured is obtained after comparison, so that the problem of difficulty in measuring the flatness of the structure to be measured is solved, the measuring precision can be ensured, the construction quality is ensured, in addition, the potential safety hazard is reduced, the safety of the measuring person is ensured, and the measuring device. The flatness measuring apparatus and the method of using the same according to the present invention will be described with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a perspective view showing an overall structure of the flatness measuring apparatus according to the present invention. The flatness measuring apparatus according to the present invention will be described with reference to fig. 1.
As shown in fig. 1, the flatness measuring apparatus of the present invention includes:
the main scale 11, the top surface of the main scale 11 is provided with a horizontal bubble 111, the bottom surface of the main scale 11 is provided with a telescopically adjustable adjusting piece 112, and the length of the adjusting piece 112 is correspondingly adjusted according to the horizontal bubble 111, so that the main scale 11 is horizontal; and
install in main scale 11 top surface and can follow the laser range finder 13 of the length direction removal regulation of main scale 11, through moving laser range finder 13 along main scale 11 and to the structure transmission laser that awaits measuring in order to record the interval between a plurality of groups main scale 11 and the structure that awaits measuring to the contrast reachs the roughness of the structure that awaits measuring.
Preferably, the top surface of the main scale 11 is engraved with a scale 114 for controlling the movement of the laser range finder 13.
As a preferred embodiment of the present invention, the present invention further includes a sliding member 12 slidably disposed on the main scale 11, the laser range finder 13 is rotatably mounted on the sliding member 12, and the laser range finder 13 is rotatably adjusted to change the emitting direction of the laser light so that the emitted laser light is vertically emitted to the surface of the structure to be measured, so that the application of the measuring device is wider, and not only the horizontal structure to be measured but also the side-vertical structure to be measured can be measured.
Specifically, as shown in fig. 2 and 3, a sliding groove 113 is formed on a side portion of the main scale 11;
the sliding member 12 includes a block 121 clamped in the sliding slot 113 and a connecting plate having one end fixedly connected to the block 121, the other end of the connecting plate is bent toward the main scale 11 to form a platform surface 122 opposite to the top surface of the main scale 11, and the laser range finder 13 is mounted on the platform 122.
Preferably, the cross section of the sliding slot 113 is T-shaped, and the cross section of the latch 121 is T-shaped correspondingly, so that the latch 121 can be prevented from being released from the sliding slot 113.
Specifically, the laser range finder comprises a base 14, wherein the laser range finder 13 is fixed at the top of the base 14, and the side part and the bottom of the base 14 are both provided with screw holes 141;
a screw 1221 matched with the screw hole 141 is fixedly arranged on the platform surface 122;
when the structure to be measured is horizontal, the screw hole 141 at the bottom of the base 14 is connected with the screw 1221, so that the laser emitted by the laser range finder 13 vertically emits to the surface of the structure to be measured;
when the structure to be measured is vertical, the screw hole 141 on the side of the base 14 is connected with the screw 1221, and the base 14 is rotated in the direction perpendicular to the main scale 11 to adjust the direction of laser emission so that the laser emitted from the laser range finder 13 is vertically emitted to the surface of the structure to be measured.
Preferably, as shown in fig. 5, the base 14 is in a cube shape, the laser range finder 13 is fixed on the top surface of the base 14, and the screw holes 141 are opened on the bottom surface and the side surface of the base 14.
Preferably, as shown in fig. 4, a notch is formed on a side of the connecting plate corresponding to the scale 114, a positioning mark is disposed at a position of the notch corresponding to the screw 1221, and a position of the sliding member 12 on the main scale 11 can be obtained according to a value of the scale 114 corresponding to the positioning mark, so that the position can be used to accurately control a moving position of the laser range finder 13.
Further, as shown in fig. 1, the adjusting member 112 includes a fixing tube 1121, one end of which is fixed to the bottom surface of the main scale 11, a telescopic rod 1122 inserted into the fixing tube 1121 and partially exposed from the other end of the fixing tube 1121, and a bolt 1123 screwed to the side of the fixing tube 1121;
the length of the adjusting member 112 is changed by moving the telescopic rod 1122 along the fixing tube 1121 to adjust the length of the exposed portion of the telescopic rod 1122, and then screwing the bolt 1123 so that the end of the bolt 1123 abuts against the telescopic rod 1122 to fix the telescopic rod 1122.
The specific implementation method of the invention is as follows:
when the structure to be measured is horizontally arranged, such as a floor slab and other structures, the measuring device is placed on the ground below the structure to be measured, the length of the adjusting piece 112 is adjusted according to the horizontal bubble 111, the bolt 1123 is loosened, the telescopic rod 1122 is moved along the fixing tube 1121 to change the length of the exposed part of the telescopic rod 1122, the bolt 1123 is screwed, the end part of the bolt 1123 abuts against the telescopic rod 1122, the position of the telescopic rod 1122 is fixed, the adjustment of the length of the adjusting piece 112 is completed, and the main scale 11 is horizontal and parallel to the structure to be measured;
screwing the screw 1221 on the platform surface into the screw hole 141 at the bottom of the base 14, radiating laser upwards by the laser range finder 13 at the moment, moving the sliding part 12 along the sliding groove 113, and controlling the moving distance of the sliding part 12 every time according to the positioning mark and the graduated scale 114, so that the laser range finder 13 measures the distance from the main scale 11 to the structure to be measured once every set interval, and obtaining the flatness of the structure to be measured by comparing data;
when the structure to be measured is vertically arranged, for example, a wall surface structure, the measuring device is placed on the ground near the structure to be measured, the base 14 is rotated along the direction perpendicular to the main scale 11 after the main scale 11 is leveled, so that the side part of the base 14 is placed on the platform surface 122, the screw rods 1221 are screwed in the corresponding screw holes 141, and at the moment, the laser range finder 13 emits laser to the structure to be measured;
one side of the main scale 11 corresponding to the laser range finder 13 is attached to the structure to be measured, so that the main scale 11 is parallel to the structure to be measured, the laser range finder 13 emits laser to the structure to be measured, the sliding part 12 is moved to measure the distance data from the main scales 11 to the structure to be measured, and the flatness of the structure to be measured is obtained through comparison.
The invention also provides a using method of the flatness measuring device, which comprises the following steps:
providing the measuring device, and placing the measuring device on the ground near the structure to be measured;
correspondingly adjusting the length of the adjusting piece 112 according to the horizontal bubble 111 to make the main scale 11 horizontal;
Further, the laser range finder comprises a sliding part 12 arranged on the main scale 11 in a sliding way, and the laser range finder 13 is rotatably arranged on the sliding part 12;
when the structure to be measured is horizontal, rotating the laser range finder 13 to vertically emit laser to the surface of the structure to be measured, and moving the laser range finder 13 to measure the flatness of the structure to be measured;
when the structure that awaits measuring is vertical form, rotate laser range finder 13 along the direction of perpendicular to main scale 11 so that laser is to the structure transmission that awaits measuring, remove main scale 11 and make main scale 11 be on a parallel with the structure that awaits measuring, remove laser range finder 13 in order to record the roughness of the structure that awaits measuring.
Preferably, the main scale 11 can be made parallel to the structure to be tested by attaching the side of the main scale 11 to the structure to be tested.
The specific operation mode of the practical implementation of the using method provided by the invention is as follows:
when the structure to be measured is horizontally arranged, such as a floor slab and other structures, the measuring device is placed on the ground below the structure to be measured, the length of the adjusting piece 112 is adjusted according to the horizontal bubble 111, the bolt 1123 is loosened, the telescopic rod 1122 is moved along the fixing tube 1121 to change the length of the exposed part of the telescopic rod 1122, the bolt 1123 is screwed, the end part of the bolt 1123 abuts against the telescopic rod 1122, the position of the telescopic rod 1122 is fixed, the adjustment of the length of the adjusting piece 112 is completed, and the main scale 11 is horizontal and parallel to the structure to be measured;
screwing the screw 1221 on the platform surface into the screw hole 141 at the bottom of the base 14, radiating laser upwards by the laser range finder 13 at the moment, moving the sliding part 12 along the sliding groove 113, and controlling the moving distance of the sliding part 12 every time according to the positioning mark and the graduated scale 114, so that the laser range finder 13 measures the distance from the main scale 11 to the structure to be measured once every set interval, and obtaining the flatness of the structure to be measured by comparing data;
when the structure to be measured is vertically arranged, for example, a wall surface structure, the measuring device is placed on the ground near the structure to be measured, the base 14 is rotated along the direction perpendicular to the main scale 11 after the main scale 11 is leveled, so that the side part of the base 14 is placed on the platform surface 122, the screw rods 1221 are screwed in the corresponding screw holes 141, and at the moment, the laser range finder 13 emits laser to the structure to be measured;
one side of the main scale 11 corresponding to the laser range finder 13 is attached to the structure to be measured, so that the main scale 11 is parallel to the structure to be measured, the laser range finder 13 emits laser to the structure to be measured, the sliding part 12 is moved to measure the distance data from the main scales 11 to the structure to be measured, and the flatness of the structure to be measured is obtained through comparison.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (10)
1. A flatness measuring apparatus, comprising:
the top surface of the main scale is provided with a horizontal bubble, the bottom surface of the main scale is provided with a regulating part which can be regulated in a telescopic way, and the length of the regulating part is correspondingly regulated according to the horizontal bubble so that the main scale is horizontal; and
install in the main scale top surface just can follow the laser range finder that the length direction of main scale removed the regulation, through following the main scale removes laser range finder and to the structure transmission laser that awaits measuring is in order to record a plurality of groups the main scale with interval between the structure awaits measuring, thereby the contrast reachs the roughness of the structure awaits measuring.
2. The flatness measuring device according to claim 1, further comprising a slider slidably mounted to said main scale, said laser range finder being rotatably mounted to said slider, said laser range finder being rotatably adjusted to change a direction of laser emission so that the emitted laser light is perpendicularly directed to the surface of the structure to be measured.
3. The flatness measuring device according to claim 2, wherein a slide groove is formed at a side portion of the main scale;
the slider is located including the card the fixture block and the one end of spout with fixture block fixed connection's connecting plate, the other end of connecting plate is to being close to the direction of main scale is buckled in order to form with the relative terrace surface of top surface of main scale, laser range finder install in on the terrace surface.
4. The flatness measuring device according to claim 3, wherein said slide groove has a T-shaped cross section, and said fixture block has a corresponding T-shaped cross section.
5. The flatness measuring device according to claim 3, further comprising a base, wherein the laser range finder is fixed on the top of the base, and both the side and the bottom of the base are provided with screw holes;
a screw rod matched with the screw hole is fixedly arranged on the platform surface;
when the structure to be measured is horizontal, the screw hole positioned at the bottom of the base is connected with the screw rod, so that laser emitted by the laser range finder is vertically emitted to the surface of the structure to be measured;
when the structure to be measured is vertical, the screw hole on the side of the base is connected with the screw rod, and the base is rotated along the direction perpendicular to the main scale so as to adjust the laser emitting direction to enable the laser emitted by the laser range finder to vertically irradiate the surface of the structure to be measured.
6. The flatness measuring device of claim 5, wherein said base is cube shaped.
7. The flatness measuring apparatus according to claim 1, wherein the adjusting member includes a fixing tube having one end fixed to a bottom surface of the main scale, a telescopic bar inserted into the fixing tube and partially exposed from the other end of the fixing tube, and a bolt screwed to a side of the fixing tube;
the length of the exposed part of the telescopic rod is adjusted by moving the telescopic rod along the fixing tube, and then the bolt is screwed, so that the end part of the bolt is abutted against the telescopic rod to fix the telescopic rod, and the length of the adjusting piece is changed.
8. The flatness measuring device according to claim 1, wherein a scale is engraved on a top surface of the main scale.
9. A method for using the flatness measuring apparatus according to claim 1, comprising the steps of:
providing the measuring device, and placing the measuring device on the ground near the structure to be measured;
correspondingly adjusting the length of the adjusting piece according to the horizontal bubble to enable the main scale to be horizontal;
and starting the laser range finder to vertically emit laser to the surface of the structure to be measured, moving the laser range finder along the main scale, and emitting laser to the structure to be measured through the laser range finder to measure the distance between a plurality of groups of the main scale and the structure to be measured so as to obtain the flatness of the structure to be measured through comparison.
10. The use of the flatness measuring device according to claim 9, further comprising a slider slidably mounted to the main scale, the laser rangefinder being rotatably mounted to the slider;
when the structure to be measured is in a horizontal state, rotating the laser range finder to vertically emit laser to the surface of the structure to be measured, and moving the laser range finder to measure the flatness of the structure to be measured;
when the structure to be measured is vertical, the laser range finder is rotated along the direction perpendicular to the main scale so that laser is emitted to the structure to be measured, the main scale is moved so that the side part of the main scale is attached to the structure to be measured, and the laser range finder is moved to measure the flatness of the structure to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010098588.4A CN111141236A (en) | 2020-02-18 | 2020-02-18 | Flatness measuring device and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010098588.4A CN111141236A (en) | 2020-02-18 | 2020-02-18 | Flatness measuring device and using method thereof |
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| CN111141236A true CN111141236A (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010098588.4A Pending CN111141236A (en) | 2020-02-18 | 2020-02-18 | Flatness measuring device and using method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112857272A (en) * | 2021-03-25 | 2021-05-28 | 甘肃有色冶金职业技术学院 | Flatness detection equipment for building construction |
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| CN106197329A (en) * | 2016-06-28 | 2016-12-07 | 黑龙江省木材科学研究所 | A kind of motion ground flatness detecting device, detecting system and detection method |
| JP2017211363A (en) * | 2016-05-24 | 2017-11-30 | 株式会社エス・ビルド | Wall face measuring method and wall face measuring device |
| KR101967712B1 (en) * | 2018-11-09 | 2019-04-10 | 이상수 | Device for surveying underground facility |
| CN211346721U (en) * | 2020-02-18 | 2020-08-25 | 中建八局轨道交通建设有限公司 | Flatness measuring device |
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2020
- 2020-02-18 CN CN202010098588.4A patent/CN111141236A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104457565A (en) * | 2014-10-27 | 2015-03-25 | 中冶建筑研究总院有限公司 | Defect size measurement device and method |
| JP2017211363A (en) * | 2016-05-24 | 2017-11-30 | 株式会社エス・ビルド | Wall face measuring method and wall face measuring device |
| CN106197329A (en) * | 2016-06-28 | 2016-12-07 | 黑龙江省木材科学研究所 | A kind of motion ground flatness detecting device, detecting system and detection method |
| KR101967712B1 (en) * | 2018-11-09 | 2019-04-10 | 이상수 | Device for surveying underground facility |
| CN211346721U (en) * | 2020-02-18 | 2020-08-25 | 中建八局轨道交通建设有限公司 | Flatness measuring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112857272A (en) * | 2021-03-25 | 2021-05-28 | 甘肃有色冶金职业技术学院 | Flatness detection equipment for building construction |
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