CN113124769A - Method for measuring camber of large plate girder - Google Patents
Method for measuring camber of large plate girder Download PDFInfo
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- CN113124769A CN113124769A CN202110374320.3A CN202110374320A CN113124769A CN 113124769 A CN113124769 A CN 113124769A CN 202110374320 A CN202110374320 A CN 202110374320A CN 113124769 A CN113124769 A CN 113124769A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 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 5
- 230000005484 gravity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process 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
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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
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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Abstract
The invention discloses a method for measuring camber of a large plate girder, and belongs to the technical field of engineering measurement. Firstly, supporting a plurality of supports on the lower plane of a lower wing plate of a steel structure large plate beam, and enabling a web plate to be vertical to the horizontal plane where the supports are located; then placing the infrared horizontal measuring instrument over against the steel structure slab beam, and opening the infrared horizontal measuring instrument to display the emitted horizontal infrared rays 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 the horizontal infrared ray, measuring the vertical distances between the three points and the lower wing plate, and calculating to obtain the camber of the steel structure large plate girder. The method has the advantages of simple tool, simple and convenient operation, low requirements on fields and environments, strong applicability, capability of quickly and accurately measuring the camber of the large plate girder, improvement on the working efficiency and the accuracy of data, 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 large plate girder.
Background
The large plate girder is the most important load-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 manufacturing plants for measuring the camber of the large plate girder of the boiler, and is also an important control point for ensuring the safe operation of the boiler. One of the means of measuring the camber of the large plate girder at present is that the large plate girder is upright, the steel wire rope is tightly attached to a lower wing plate of the large plate girder to measure the maximum distance between the lower wing plate and the steel wire rope, namely the camber of the large plate girder, the method corrects the sagging distance of the steel wire rope caused by the gravity of the steel wire rope, the measured value has a certain relation with the tension of two ends of the steel wire rope, and the error is large; the second method of camber of the large plate girder is that the large plate girder lies horizontally, the web plate of the large plate girder is parallel to the ground, the steel wire rope is tightly attached to the lower wing plate of the large plate girder to measure the maximum distance between the lower wing plate and the steel wire rope, and the method does not consider the deflection caused by the self weight of the large plate girder, and the measured camber still needs to be corrected according to the empirical value.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method for measuring the camber of a large plate girder, which can quickly and accurately measure the camber of the large plate girder and improve the working efficiency and the accuracy of data.
The invention is realized by the following technical scheme:
a method for measuring the camber of a large plate girder comprises the following steps:
1) supporting a plurality of supports on the lower plane of a lower wing plate of the steel structure large plate girder, and enabling the web plate to be vertical to the horizontal plane where the supports are located;
2) placing the infrared horizontal measuring instrument over against the steel structure slab beam, and opening the infrared horizontal measuring instrument to display the emitted horizontal infrared rays 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 the horizontal infrared ray, 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 large plate girder.
Preferably, the plurality of brackets are respectively arranged on the N equal division points in the length direction of the steel structure large plate girder.
Further preferably, N ═ 2.
Preferably, the horizontal distance between the infrared horizontal measuring instrument and the web plate is 5-10 m.
Preferably, the infrared level gauge is at the same level as the support.
Further preferably, the deviation of the flatness of the horizontal plane is < 1 mm.
Preferably, the height of the plurality of brackets is equal.
Preferably, the vertical distance between the middle point of the length direction of the web and the lower wing plate is h2The vertical distances between the two end points and the lower wing plate are respectively h1And h3Then, the camber of steel construction large plate beam does: h ═ h (h)1+h3)/2-h2。
Compared with the prior art, the invention has the following beneficial technical effects:
according to the method for measuring the camber of the large plate girder, disclosed by the invention, the web plate is vertical to the horizontal plane where the bracket is positioned during measurement, so that the large plate girder can be ensured to be in a field installation horizontal state, an absolute horizontal straight line can be obtained during measurement by using the infrared level gauge, and the error influence caused by the gravity of the steel wire rope during measurement by using the steel wire rope is avoided. The method has the advantages of simple tool, simple and convenient operation, low requirements on fields and environments, strong applicability, capability of quickly and accurately measuring the camber of the large plate girder, improvement on the working efficiency and the accuracy of data, and good application prospect.
Furthermore, a plurality of supports are respectively arranged on N equal division points in the length direction of the steel structure large plate girder, and the steel structure large plate girder can be uniformly supported in the whole length direction.
Furthermore, 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 ray brings errors to the measuring result.
Furthermore, the infrared horizontal measuring instrument and the bracket are positioned on the same horizontal plane, so that the measuring precision is ensured.
Furthermore, the heights of the plurality of supports are equal, so that system errors are avoided.
Drawings
FIG. 1 is an overall schematic view of the method for measuring the camber of a girder according to 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: the steel structure large plate beam is 1, the steel structure large plate beam is 2, the web plate is 3, the upper wing plate is 4, the lower wing plate is 5, the rib plate is 6, the bracket is 7, and the horizontal infrared rays are 8-degrees.
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given by way of illustration and not by way of limitation.
The steel structure large plate 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 the camber of the girder comprises the following steps:
1) a plurality of brackets 7 are supported on the lower plane of a lower wing plate 5 of the steel structure large plate beam 1, so that the web plate 3 is vertical to the horizontal plane where the brackets 7 are positioned; preferably, the plurality of brackets 7 are respectively arranged on N equal division points in the length direction of the steel structure large plate girder 1; in general, N is 2, that is, 2 brackets 7 are provided at the position 1/3 and the position 2/3 in the longitudinal direction of the steel structure girder 1. While keeping the heights of the plurality of brackets 7 equal.
2) Placing the infrared horizontal measuring instrument 2 over against the steel structure slab beam 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 horizontal 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 1 mm.
3) Respectively 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 distances between the three points and the upper plane of the lower wing plate 5, and calculating to obtain the camber of the steel structure large plate beam 1: the vertical distance between the middle point of the web 3 in the length direction and the lower wing plate 5 is h2The vertical distances between the two end points and the lower wing plate 5 are respectively h1And h3And the camber of the steel structure large plate girder 1 is as follows: h ═ h (h)1+h3)/2-h2。
The process of the invention is further illustrated below in a specific example:
the infrared horizontal measuring instrument 2 is placed right in front of the steel structure large plate beam and is vertically 8 meters away from a web plate 3 of the steel structure large plate beam 1; after the infrared horizontal measuring instrument 2 is started, a horizontal infrared ray 8 is displayed on the large plate girder web 3.
According to the height of the horizontal infrared ray 8, a point A, a point B and a point C are marked at two ends of the web 3 and at the center of the web 3 in the length direction. The vertical distances from the measuring point A, the measuring point B and the measuring point C to the lower wing plate 5 of the steel structure large plate girder 1 are h respectively1＝610mm、h2＝602mm、h3When the camber of the steel structure girder 1 is 614mm, (h) is1+h3)/2-h2＝10mm。
It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.
Claims (8)
1. A method for measuring the camber of a large plate girder is characterized by comprising the following steps:
1) a plurality of brackets (7) are supported on the lower plane of a lower wing plate (5) of the steel structure large plate beam (1), so that the web (3) is vertical to the horizontal plane where the brackets (7) are located;
2) placing the infrared horizontal measuring instrument (2) right opposite to the steel structure slab beam (1), and opening the infrared horizontal measuring instrument (2) to display the emitted horizontal infrared rays (8) on the web plate (3);
3) and respectively marking the middle point and two end points of the web plate (3) in the length direction on the horizontal infrared ray (8), measuring the vertical distances between the three points and the upper plane of the lower wing plate (5), and calculating to obtain the camber of the steel structure large plate beam (1).
2. The method for measuring the camber of a girder according to claim 1, wherein a plurality of supports (7) are respectively provided at points of N equal divisions in the longitudinal direction of the steel structure girder (1).
3. The method for measuring the camber of a girder of claim 2, wherein N is 2.
4. The method for measuring the camber of the girder according to claim 1, wherein the horizontal distance between the infrared level gauge (2) and the web (3) is 5 to 10 m.
5. A method for measuring the camber of a girder according to claim 1, wherein the infrared level gauge (2) is located on the same horizontal plane as the bracket (7).
6. A method of measuring the camber of a girder according to claim 4, wherein the deviation of the flatness of the horizontal plane is < 1 mm.
7. A method for measuring the camber of a girder according to claim 1, wherein the plurality of supports (7) are equal in height.
8. A method for measuring camber of a girder according to claim 1, wherein a vertical distance h between a midpoint in a length direction of the web (3) and the lower wing (5) is provided2The vertical distances between the two end points and the lower wing plate (5) are respectively h1And h3And the camber of the steel structure large plate girder (1) is as follows: h ═ h (h)1+h3)/2-h2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110374320.3A CN113124769B (en) | 2021-04-07 | 2021-04-07 | Method for measuring camber of girder |
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| CN202110374320.3A CN113124769B (en) | 2021-04-07 | 2021-04-07 | Method for measuring camber of girder |
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| CN113124769B CN113124769B (en) | 2024-05-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115824539A (en) * | 2023-02-14 | 2023-03-21 | 滨州市特种设备检验研究院 | Large plate girder deflection measuring system |
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2021
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