CN102486372A - Theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method - Google Patents
Theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method Download PDFInfo
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- CN102486372A CN102486372A CN2010105750595A CN201010575059A CN102486372A CN 102486372 A CN102486372 A CN 102486372A CN 2010105750595 A CN2010105750595 A CN 2010105750595A CN 201010575059 A CN201010575059 A CN 201010575059A CN 102486372 A CN102486372 A CN 102486372A
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- steel wire
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- spherical tank
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Abstract
The invention relates to a theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method. The theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method comprises the following steps of 1, preparing a contrast sample through the processes of cutting off parts having length of L from steel wire ropes having different diameters according to a determined steel wire rope diameter scope and carrying out steel wire rope nondestructive test contrast sample preparation, 2, selecting steel wire ropes which have the same structure and length of 2 meters, cutting the selected steel wire ropes at their middle parts for same defect manufacture, and carrying out breaking force experiments respectively on the cut steel wire ropes, 3, carrying out magnetization, calibration and detection of the steel wire rope nondestructive test contrast sample obtained by the step 1 by a steel wire rope electromagnetic tester to obtain different defect detection values, and preparing a contrast sample parameter parallel table corresponding to breaking force values, and 4, determining steel wire rope detection data according to on-site detection data and the contrast sample parameter parallel table, calculating breaking force values of the detected steel wire ropes according to the steel wire rope detection data, and carrying out detection conclusion determination. The theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method is simple, can produce effects fast, and can guarantee safe and normal use of a steel wire rope according to accurate contrast of a steel wire rope nondestructive test contrast sample and a detection result.
Description
Technical field
The present invention relates to the squareness measurement of large-size spherical tank pillar, relate in particular to the online accurate measurement method of a kind of large-size spherical tank pillar verticality.
Background technology
Stipulate according to GB12337 " steel spherical storage tank "; In the process of installation of the scene of large-size spherical tank and periodic inspection; Need measure spherical tank pillar verticality, the method that usually adopts is manual vertical messenger wire method, through measure pedal line distance from top pillar apart from a1 and pedal line distance from bottom pillar apart from a2 calculate perpendicularity deviation standard Δ=| a2-a1|; General allow when pillar height H≤8m Δ≤10mm; When pillar height H＞8m, Δ≤15mm.
When adopting the messenger wire method to measure, need set up framing scaffold (height is more than 10 meters usually).In the installation and the inspection period of spherical tank, because the existing framing scaffold of setting up is easier to so implement this method ratio.But also can run into following special circumstances, the one, the framing scaffold of setting up has stopped that the measuring position will remove and receive when restriction duration, the 2nd, run into wind when big messenger wire under wind action, produce bigger skew, cause the former qualified data franchise that seriously is above standard; , the 3rd, when the spherical tank run duration need be to serious overproof pillar verticality on-line monitoring, then obviously adopt the messenger wire method unrealistic.
Summary of the invention
The present invention is intended to address the deficiencies of the prior art, and a kind of online accurate measurement method of large-size spherical tank pillar verticality based on transit is provided.The measuring result error that the present invention is simple to operate, environment causes is little.
For solving the problems of the technologies described above, a kind of online accurate measurement method of large-size spherical tank pillar verticality of the present invention based on transit, it comprises the pillar radially measurement of verticality and the measurement of the circumferential verticality of pillar,
The measurement of said radially verticality comprises:
Set up transit, be erected at pillar one side to be measured to transit, and be positioned at this column bottom and cut the column bottom of propping up of circle and spherical tank right opposite and cut on the round common tangent;
Crosshair in the transit camera lens is aimed to be measured element cylinder top measurement point, and the locking transit can't move transit in the horizontal direction;
With the transit pandown, from eyepiece, find to be measured element cylinder bottom measurement point;
Place a rule L in the bottom, definite crosshair and this element cylinder bottom measurement point distance, delta in eyepiece=| a2-a1|; A1=0 wherein, thus the perpendicularity deviation value of this pillar obtained;
The measurement of said circumferential verticality comprises:
Set up transit, be erected at pillar one side to be measured to transit, and be positioned at this column bottom and cut on the round tangent line vertical with said common tangent;
Crosshair in the transit camera lens is aimed at pillar to be measured top measurement point, and the locking transit can't move transit in the horizontal direction;
With the transit pandown, from eyepiece, find to be measured element cylinder bottom measurement point;
Place a rule L in the bottom, definite crosshair and this element cylinder bottom measurement point distance, delta in eyepiece=| a2-a1|; A1=0 wherein, thus the perpendicularity deviation value of this pillar obtained.
The described online accurate measurement method of large-size spherical tank pillar verticality based on transit, said circumferential value is meant: after the spherical tank pillar is installed centering, be the spherical tank circumferential direction that pillar degree of tilt Δ=[a2-a1] of tangential direction is defined as circumferential verticality value.
The described online accurate measurement method of large-size spherical tank pillar verticality based on transit, said radial values is meant: after the spherical tank pillar was installed centering, Δ=[a2-a1] was defined as radially verticality value the diametric pillar degree of tilt of spherical tank.
The present invention and messenger wire method are compared.In the pillar squareness measurement in 650 cubic metres of spherical tanks check, at first adopt transit to measure, measure pillar maximum radial deviation 25mm, maximum circumferentially deviation 24mm; Adopt the messenger wire method that this two value is carried out repetition measurement, the result who obtains is pillar maximum radial deviation 27mm, maximum circumferentially deviation 26mm, and relatively actual measured value can know that the two measurement difference is less.Because transit adopts is that the method for bus projection is measured, so its measuring error is less relatively; And the messenger wire method is in the operating process of reality, and environmental factor and people are that the error that causes is relatively large, thus the transit survey method than messenger wire method more accurately, reliable.
Description of drawings:
Below, in conjunction with accompanying drawing the present invention is further described:
Synoptic diagram when Fig. 1 is the circumferential squareness measurement of said pillar;
Fig. 2 is an error analysis synoptic diagram of the present invention.
Among Fig. 1:
Pillar perpendicularity deviation Δ=a2-a1
a1＝100mm
Positive and negative number agreement of Δ:
Face pillar: upper end flare "+"
Upper end introversion "-"
Upper end Right deviation "+"
Upper end left-leaning "-"
Embodiment
Below, in conjunction with embodiment, the present invention is further described:
Like Fig. 1--shown in Figure 2; For 3000 cubic metres of spherical tanks with 12 pillars; Need be example with No. 10 pillars and No. 7 pillars below to radially the measuring of its pillar, the verticality and the circumferential accurate measurement method of verticality are described radially with circumferential verticality.
Fig. 1 center line AB is the bottom section circle outside common tangent of No. 4 pillars and No. 10 pillars (the relative pillar of the centre of sphere), and line CD is the parallel lines of AB, and CD is the tangent lines of No. 7 pillar bottom section circles.When measuring the circumferential verticality of No. 10 pillars, transit is erected at the B end (when measuring No. 4 circumferential verticality of pillar, the A that transit is erected at the AB line holds) of AB line; Measure No. 7 pillars radially during verticality, transit is erected at the D end of CD line.Adjustment transit level just can be measured by following method.
The implementation process of measuring method
When measuring the circumferential verticality of No. 10 pillars; With the crosshair in the transit camera lens aim at No. 10 pillar AB to bus top measurement point, as shown in Figure 2, the locking transit; Transit can't be moved in the horizontal direction; With the transit pandown, from eyepiece, find No. 10 pillar AB to bus bottom measurement point, place a rule L in the bottom; Can in eyepiece, confirm crosshair and pillar AB to bus bottom measurement point distance, delta=| a2-a1| (wherein a1=0), thus obtain the perpendicularity deviation value of this pillar.Radially squareness measurement method of No. 7 pillars is similar to top method, repeats no more.
Error analysis
From measuring principle; What require transit sets up the place strictness on the AB line, but in the measuring process of reality, has unavoidably to depart from and bring substantial measurement errors; Whether this error can have influence on pillar squareness measurement result, and the error that causes with regard to the decorating position of instrument is below analyzed.
Derivation:
If the A point is the instrumental theory datum mark, the B point is an instrument actual measurement reference point, and the C point is theoretical measuring target point, and D is the actual measurement impact point, and L is the distance that theoretical datum mark is arrived in the center of circle, and S is that theoretical datum mark is to distance between the actual measurement reference point.
Establish AC=BD again, and AC, BD are the tangent line of ⊙ O.
Be prone to card Δ OAB ≌ Δ OBD
∴∠AOB＝∠COD
∠ COD is the drift angle, the center of circle of ⊙ O
The instance calculation
To go up the unit representation of numerical value degree of being converted into does
For given measurement pillar, it is very small that the tested bus of pillar that causes owing to the datum mark deviation moves the error of perpendicularity that produces.Can find out through above derivation and calculation, S＜＜situation that L sets up under, bigger fiducial error is very small to the influence of whole measurement result, can ignore.This measuring method is reliably correct, and this method is simple to operate, measurement result is accurate.Can be applied to the development after on-line monitoring pillar verticality exceeds standard.
The case checking:
In certain periodic inspection, find 3000 meters of Baosteel Ministry of Energy
3Nitrogen spherical tank pillar verticality is seriously overproof, is safe through stress analysis result of calculation at that time.Ministry of Energy is in order to grasp spherical tank run duration pillar verticality development at any time; Require our unit to help to implement pillar verticality on-line monitoring; Use the said method on-line monitoring after 1 year through the testing staff of our unit, the result finds that the development and change of verticality numerical value are little, does not exceed stress analysis result of calculation scope; For the scene provides strong technical support, following table is taken passages wherein three months data.
Claims (3)
1. online accurate measurement method of large-size spherical tank pillar verticality based on transit, it comprises the pillar radially measurement of verticality and the measurement of the circumferential verticality of pillar, it is characterized in that,
The measurement of said radially verticality comprises:
Set up transit, be erected at pillar one side to be measured to transit, and be positioned at this column bottom and cut the column bottom of propping up of circle and spherical tank right opposite and cut on the round common tangent;
Crosshair in the transit camera lens is aimed to be measured element cylinder top measurement point, and the locking transit can't move transit in the horizontal direction;
With the transit pandown, from eyepiece, find to be measured element cylinder bottom measurement point;
Place a rule L in the bottom, definite crosshair and this element cylinder bottom measurement point distance, delta in eyepiece=| a2-a1|; A1=0 wherein, thus the perpendicularity deviation value of this pillar obtained;
The measurement of said circumferential verticality comprises:
Set up transit, be erected at pillar one side to be measured to transit, and be positioned at this column bottom and cut on the round tangent line vertical with said common tangent;
Crosshair in the transit camera lens is aimed at pillar to be measured top measurement point, and the locking transit can't move transit in the horizontal direction;
With the transit pandown, from eyepiece, find to be measured element cylinder bottom measurement point;
Place a rule L in the bottom, definite crosshair and this element cylinder bottom measurement point distance, delta in eyepiece=| a2-a1|; A1=0 wherein, thus the perpendicularity deviation value of this pillar obtained.
2. the online accurate measurement method of large-size spherical tank pillar verticality based on transit according to claim 1; It is characterized in that; Said circumferential value is meant: after the spherical tank pillar is installed centering, be the spherical tank circumferential direction that pillar degree of tilt Δ=[a2-a1] of tangential direction is defined as circumferential verticality value.
3. the online accurate measurement method of large-size spherical tank pillar verticality based on transit according to claim 1; It is characterized in that; Said radial values is meant: after the spherical tank pillar was installed centering, Δ=[a2-a1] was defined as radially verticality value the diametric pillar degree of tilt of spherical tank.
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| CN2010105750595A CN102486372A (en) | 2010-12-06 | 2010-12-06 | Theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method |
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| CN2010105750595A CN102486372A (en) | 2010-12-06 | 2010-12-06 | Theodolite-based large-scale spherical tank pillar verticality on-line accurate measurement method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048624B (en) * | 2014-07-04 | 2016-09-28 | 中国二十二冶集团有限公司 | Scaffold perpendicularity laser detection equipment and detection method |
| CN111982088A (en) * | 2020-07-30 | 2020-11-24 | 上海市机电设计研究院有限公司 | Method for measuring perpendicularity of precast concrete tower barrel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201218716Y (en) * | 2008-07-07 | 2009-04-08 | 天津市中重科技工程有限公司 | Magnetic suction type measurement staff for verticality of large workpiece vertical plane and horizontal plane |
| CN101598547A (en) * | 2009-07-13 | 2009-12-09 | 中冶京唐建设有限公司 | Method for measuring mounting inclination angle of one-side-inclined structure |
-
2010
- 2010-12-06 CN CN2010105750595A patent/CN102486372A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201218716Y (en) * | 2008-07-07 | 2009-04-08 | 天津市中重科技工程有限公司 | Magnetic suction type measurement staff for verticality of large workpiece vertical plane and horizontal plane |
| CN101598547A (en) * | 2009-07-13 | 2009-12-09 | 中冶京唐建设有限公司 | Method for measuring mounting inclination angle of one-side-inclined structure |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048624B (en) * | 2014-07-04 | 2016-09-28 | 中国二十二冶集团有限公司 | Scaffold perpendicularity laser detection equipment and detection method |
| CN111982088A (en) * | 2020-07-30 | 2020-11-24 | 上海市机电设计研究院有限公司 | Method for measuring perpendicularity of precast concrete tower barrel |
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Application publication date: 20120606 |