CN113124769B - Method for measuring camber of girder - Google Patents
Method for measuring camber of girder Download PDFInfo
- Publication number
- CN113124769B CN113124769B CN202110374320.3A CN202110374320A CN113124769B CN 113124769 B CN113124769 B CN 113124769B CN 202110374320 A CN202110374320 A CN 202110374320A CN 113124769 B CN113124769 B CN 113124769B
- Authority
- CN
- China
- Prior art keywords
- girder
- camber
- horizontal
- measuring
- infrared
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 37
- 239000010959 steel Substances 0.000 claims abstract description 37
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000005484 gravity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000007665 sagging Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
-
- 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
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a method for measuring camber of a girder, and belongs to the technical field of engineering measurement. Firstly, supporting a plurality of brackets on the lower plane of a lower wing plate of a steel structure girder so that a web plate is perpendicular to the horizontal plane where the brackets are positioned; then placing the infrared horizontal measuring instrument opposite to the steel structure girder, and opening the infrared horizontal measuring instrument to display the emitted horizontal infrared on the web plate; and finally, respectively marking the middle point and the two end points of the web plate in the length direction on horizontal infrared rays, measuring the vertical distances between the three points and the lower wing plate, and calculating to obtain the camber of the steel structure girder. The invention has the advantages of simple tool, simple and convenient operation, low requirements on fields and environment, strong applicability, capability of rapidly and accurately measuring the camber of the girder, improvement of working efficiency and data accuracy and good application prospect.
Description
Technical Field
The invention belongs to the technical field of engineering measurement, and particularly relates to a method for measuring camber of a girder.
Background
The girder is the main bearing part of the boiler equipment, bears the great weight of the boiler equipment, is one of the most important quality control points of equipment monitoring personnel and factories for measuring the camber of the girder of the boiler, and is also an important control point for ensuring the safe operation of the boiler. One of the current means for measuring the camber of the girder is that the girder is vertical, a steel wire rope is tightly attached to a lower wing plate of the girder to measure the maximum distance between the lower wing plate and the steel wire rope as the camber of the girder, the method is to correct the sagging distance of the steel wire rope caused by the gravity of the steel wire rope, the measured value is also related to the tensile force of two ends of the steel wire rope, and the error is larger; the second means of camber of the girder is that the girder is horizontal, the web of the girder is parallel to the ground, the maximum distance between the lower wing plate and the steel wire rope is measured by using the steel wire rope to cling to the lower wing plate of the girder, the camber is not considered, the camber measurement still needs to be corrected according to an empirical value due to the deflection caused by the dead weight of the girder.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a measuring method for the camber of a girder, which can rapidly and accurately measure the camber of the girder and improve the working efficiency and the accuracy of data.
The invention is realized by the following technical scheme:
a measuring method of camber of a girder comprises the following steps:
1) Supporting a plurality of brackets on the lower plane of a lower wing plate of the steel structure girder so that the web plate is vertical to the horizontal plane where the brackets are positioned;
2) Placing the infrared horizontal measuring instrument opposite to the steel structure girder, and opening the infrared horizontal measuring instrument to display the emitted horizontal infrared on the web plate;
3) And respectively marking the middle point and the two end points of the web plate in the length direction on horizontal infrared rays, measuring the vertical distances between the three points and the upper plane of the lower wing plate, and calculating to obtain the camber of the steel structure girder.
Preferably, the brackets are respectively arranged on N equal dividing points in the length direction of the steel structure girder.
Further preferably, n=2.
Preferably, the infrared level gauge is at a horizontal distance of 5-10 m from the web.
Preferably, the infrared level gauge is in the same horizontal plane as the support.
Further preferably, the flatness deviation of the horizontal plane is < 1mm.
Preferably, the heights of the several brackets are equal.
Preferably, the vertical distance between the middle point of the length direction of the web plate and the lower wing plate is h 2, the vertical distances between the two end points and the lower wing plate are h 1 and h 3 respectively, and then the camber of the steel structure girder is: h= (h 1+h3)/2-h2).
Compared with the prior art, the invention has the following beneficial technical effects:
According to the measuring method for the camber of the girder, the web is vertical to the horizontal plane where the bracket is positioned during measurement, so that the girder is in a field installation horizontal state, an absolute horizontal straight line can be obtained during measurement by using an infrared level meter, and the error influence caused by the gravity of a steel wire rope during measurement by using the steel wire rope is avoided. The invention has the advantages of simple tool, simple and convenient operation, low requirements on fields and environment, strong applicability, capability of rapidly and accurately measuring the camber of the girder, improvement of working efficiency and data accuracy and good application prospect.
Further, the brackets are respectively arranged on N equal division points in the length direction of the steel structure girder, so that the steel structure girder can be uniformly supported in the whole length direction.
Further, the horizontal distance between the infrared horizontal measuring instrument and the web is 5-10 m, and the distance is too far or too close, so that the thickness of the horizontal infrared rays can cause errors to the measuring result.
Further, the infrared horizontal measuring instrument and the bracket are positioned on the same horizontal plane, so that the measuring precision is ensured.
Further, the heights of the brackets are equal, so that systematic errors are avoided.
Drawings
FIG. 1 is an overall schematic diagram of a method of measuring camber of a girder of the present invention;
Fig. 2 is a schematic side view of the method for measuring camber of a girder according to the present invention.
In the figure: 1 is a steel structure girder, 2 is a steel structure girder, 3 is a web plate, 4 is an upper wing plate, 5 is a lower wing plate, 6 is a rib plate, 7 is a bracket, and 8 is horizontal infrared rays.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples, which are given by way of illustration and not limitation.
The steel structure girder 1 comprises a web plate 3, an upper wing plate 4, a lower wing plate 5 and a rib plate 6.
Referring to fig. 1 and 2, the method for measuring camber of a girder of the present invention comprises the steps of:
1) Supporting a plurality of brackets 7 on the lower plane of a lower wing plate 5 of the steel structure girder 1, so that the web 3 is vertical to the horizontal plane where the brackets 7 are positioned; preferably, a plurality of brackets 7 are respectively arranged on N equally-divided points in the length direction of the steel structure girder 1; in general, n=2, that is, 2 brackets 7 are provided at 1/3 position and 2/3 position in the longitudinal direction of the steel structure girder 1, respectively. While keeping the heights of the several holders 7 equal.
2) Placing the infrared horizontal measuring instrument 2 opposite to the steel structure girder 1, and opening the infrared horizontal measuring instrument 2 to display the emitted horizontal infrared 8 on the web 3; preferably, the horizontal distance between the infrared horizontal measuring instrument 2 and the web 3 is 5-10 m; the infrared level measuring instrument 2 and the bracket 7 are positioned on the same horizontal plane, and the flatness deviation of the horizontal plane is less than 1mm.
3) Marking the middle point and two end points of the web 3 in the length direction on the horizontal infrared ray 8, measuring the vertical distance between the three points and the upper plane of the lower wing plate 5, and calculating to obtain the camber of the steel structure girder 1: the vertical distance between the middle point of the length direction of the web plate 3 and the lower wing plate 5 is h 2, the vertical distances between the two end points and the lower wing plate 5 are h 1 and h 3 respectively, and then the camber of the steel structure girder 1 is as follows: h= (h 1+h3)/2-h2).
The method of the invention is further illustrated in the following by a specific example:
The infrared horizontal measuring instrument 2 is arranged right in front of the steel structure girder and is 8 meters away from the web 3 of the steel structure girder 1 vertically; after the infrared horizontal measuring instrument 2 is started, a horizontal infrared ray 8 is displayed on the girder web 3.
According to the height of the horizontal infrared ray 8, points A, B and C are marked on the two ends of the web 3 and the center of the web 3 in the length direction. The vertical distances from the measurement points a, B and C to the lower wing plate 5 of the steel structure girder 1 are h 1＝610mm、h2＝602mm、h3 =614 mm, respectively, and the camber of the steel structure girder 1 is h= (h 1+h3)/2-h2 =10 mm.
It is to be understood that the foregoing description is only a part of the embodiments of the present invention, and that the equivalent changes of the system described according to the present invention are included in the protection scope of the present invention. Those skilled in the art can substitute the described specific examples in a similar way without departing from the structure of the invention or exceeding the scope of the invention as defined by the claims, all falling within the scope of protection of the invention.
Claims (5)
1. The method for measuring the camber of the girder is characterized by comprising the following steps of:
1) A plurality of brackets (7) are supported on the lower plane of a lower wing plate (5) of the steel structure girder (1), the brackets (7) are respectively arranged on N equally dividing points in the length direction of the steel structure girder (1), the heights of the brackets (7) are equal, and the web (3) is vertical to the horizontal plane where the brackets (7) are positioned;
2) Placing the infrared horizontal measuring instrument (2) opposite to the steel structure girder (1), and opening the infrared horizontal measuring instrument (2) to display the emitted horizontal infrared rays (8) on the web (3); the infrared horizontal measuring instrument (2) and the bracket (7) are positioned on the same horizontal plane;
3) Marking the middle point and the two end points of the web plate (3) in the length direction on the horizontal infrared ray (8), measuring the vertical distance between the three points and the upper plane of the lower wing plate (5), and calculating to obtain the camber of the steel structure girder (1).
2. A method of measuring camber of a girder as claimed in claim 1, wherein N = 2.
3. A method of measuring camber of a girder according to claim 1, characterized in that the infrared level gauge (2) is at a level distance of 5-10 m from the web (3).
4. A method of measuring camber of a girder as claimed in claim 1, wherein the flatness deviation of the horizontal plane is < 1mm.
5. The method for measuring the camber of a girder according to claim 1, wherein the vertical distance between the middle point of the length direction of the web (3) and the lower wing plate (5) is h 2, the vertical distances between the two end points and the lower wing plate (5) are h 1 and h 3 respectively, and the camber of the girder (1) with the steel structure is: h= (h 1+h3)/2-h2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110374320.3A CN113124769B (en) | 2021-04-07 | 2021-04-07 | Method for measuring camber of girder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110374320.3A CN113124769B (en) | 2021-04-07 | 2021-04-07 | Method for measuring camber of girder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113124769A CN113124769A (en) | 2021-07-16 |
| CN113124769B true CN113124769B (en) | 2024-05-07 |
Family
ID=76775657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110374320.3A Active CN113124769B (en) | 2021-04-07 | 2021-04-07 | Method for measuring camber of girder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113124769B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116893038A (en) * | 2023-02-14 | 2023-10-17 | 滨州市特种设备检验研究院 | Large plate girder deflection measuring system |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0579832A (en) * | 1991-09-24 | 1993-03-30 | Kobe Steel Ltd | Measuring method for camber of plate material |
| CN2299301Y (en) * | 1997-04-07 | 1998-12-02 | 黑龙江省劳动保护科学技术研究所 | Laser arch gauge |
| KR20000040421A (en) * | 1998-12-18 | 2000-07-05 | Inst Of Ind Science Pohang | System for measuring camber of slab using pyramid image |
| CN101245997A (en) * | 2008-03-27 | 2008-08-20 | 武汉科技大学 | Device for detecting upper arch deformation curve of crane main girder |
| CN101915553A (en) * | 2010-08-31 | 2010-12-15 | 武汉一冶钢结构有限责任公司 | Simple precamber measuring method in steel box girder construction |
| CN103217262A (en) * | 2013-03-29 | 2013-07-24 | 国家电网公司 | Device and method for testing board girder deflection of boiler |
| CN104215192A (en) * | 2013-06-05 | 2014-12-17 | 中国铁建港航局集团有限公司 | Method for measuring inverted camber of prefabricated beam/slab |
| CN104634267A (en) * | 2015-01-09 | 2015-05-20 | 河南省特种设备安全检测研究院 | Camber measuring method of overhead and gantry crane and matched measuring device |
| CN205642305U (en) * | 2015-12-17 | 2016-10-12 | 武汉科技大学 | Detect hoist camber's device |
| CN208059808U (en) * | 2018-05-09 | 2018-11-06 | 上海神尹重工机械设备有限公司 | A kind of bridge machine arch measurer |
| CN110081856A (en) * | 2019-05-05 | 2019-08-02 | 中国建筑第八工程局有限公司 | The measurement method of large span template arch camber |
| CN112013776A (en) * | 2020-10-12 | 2020-12-01 | 上海市特种设备监督检验技术研究院 | Device and method for measuring camber of crane girder |
| CN212843429U (en) * | 2020-10-21 | 2021-03-30 | 中钢集团郑州金属制品研究院有限公司 | Device for rapidly measuring arching value of prestressed beam slab |
-
2021
- 2021-04-07 CN CN202110374320.3A patent/CN113124769B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0579832A (en) * | 1991-09-24 | 1993-03-30 | Kobe Steel Ltd | Measuring method for camber of plate material |
| CN2299301Y (en) * | 1997-04-07 | 1998-12-02 | 黑龙江省劳动保护科学技术研究所 | Laser arch gauge |
| KR20000040421A (en) * | 1998-12-18 | 2000-07-05 | Inst Of Ind Science Pohang | System for measuring camber of slab using pyramid image |
| CN101245997A (en) * | 2008-03-27 | 2008-08-20 | 武汉科技大学 | Device for detecting upper arch deformation curve of crane main girder |
| CN101915553A (en) * | 2010-08-31 | 2010-12-15 | 武汉一冶钢结构有限责任公司 | Simple precamber measuring method in steel box girder construction |
| CN103217262A (en) * | 2013-03-29 | 2013-07-24 | 国家电网公司 | Device and method for testing board girder deflection of boiler |
| CN104215192A (en) * | 2013-06-05 | 2014-12-17 | 中国铁建港航局集团有限公司 | Method for measuring inverted camber of prefabricated beam/slab |
| CN104634267A (en) * | 2015-01-09 | 2015-05-20 | 河南省特种设备安全检测研究院 | Camber measuring method of overhead and gantry crane and matched measuring device |
| CN205642305U (en) * | 2015-12-17 | 2016-10-12 | 武汉科技大学 | Detect hoist camber's device |
| CN208059808U (en) * | 2018-05-09 | 2018-11-06 | 上海神尹重工机械设备有限公司 | A kind of bridge machine arch measurer |
| CN110081856A (en) * | 2019-05-05 | 2019-08-02 | 中国建筑第八工程局有限公司 | The measurement method of large span template arch camber |
| CN112013776A (en) * | 2020-10-12 | 2020-12-01 | 上海市特种设备监督检验技术研究院 | Device and method for measuring camber of crane girder |
| CN212843429U (en) * | 2020-10-21 | 2021-03-30 | 中钢集团郑州金属制品研究院有限公司 | Device for rapidly measuring arching value of prestressed beam slab |
Non-Patent Citations (1)
| Title |
|---|
| 在用电动单梁起重机主梁上拱度检验方法的探讨;许忠福;;起重运输机械;20080220(第02期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113124769A (en) | 2021-07-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN200943486Y (en) | Driftmeter checking platform | |
| CN113124769B (en) | Method for measuring camber of girder | |
| WO2023197597A1 (en) | Automation apparatus for verifying accuracy of pendulum system, and method | |
| CN205463633U (en) | Rolling mill work roll table lift height error detection device | |
| CN107695110B (en) | Lead the method with the spacing of edger roll and centering in a kind of Fast Calibration hot rolling mill side | |
| CN215952554U (en) | Frame post template straightness correcting unit that hangs down for municipal construction | |
| CN107084835B (en) | Cantilever pre-configuration data detection device and detection method thereof | |
| CN214200056U (en) | Quick measuring and calibrating device for loop of hot rolled strip steel finishing mill group | |
| CN212513034U (en) | Bidirectional prism support | |
| CN213779032U (en) | Simple and easy unwrapping wire measuring device that construction used | |
| CN112304282B (en) | Method for mounting and measuring rails of centrifugal machine | |
| CN212159508U (en) | Drying shrinkage testing device | |
| CN103042382A (en) | Elimination method for guide rail assembling errors | |
| CN206944932U (en) | A kind of urban track traffic trackside equipment installation site measuring system | |
| CN205642656U (en) | Perpendicular temperature rise detection device of bus duct | |
| CN105953933A (en) | Bus duct vertical temperature rise detection device and detection method | |
| CN214843117U (en) | Device for detecting bending difference of leveling staff | |
| CN217877396U (en) | Meter frame for multi-cylinder large-scale unit | |
| CN110081856A (en) | The measurement method of large span template arch camber | |
| CN211824374U (en) | Leveling distance distribution ruler | |
| CN217127892U (en) | Detection apparatus for guide rail inspection tester | |
| CN104677247A (en) | Equipment wire clamp hole distance rapid measurement device | |
| CN219589606U (en) | Get type and measure frock | |
| CN215064524U (en) | Auxiliary tool for measuring verticality and levelness of roller system | |
| CN113280787B (en) | Bridge linear detection method based on opposite side height difference measurement |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |