CN103115609A - Temperature-based bridge triangulated height transmission correcting method - Google Patents
Temperature-based bridge triangulated height transmission correcting method Download PDFInfo
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- CN103115609A CN103115609A CN201310049564XA CN201310049564A CN103115609A CN 103115609 A CN103115609 A CN 103115609A CN 201310049564X A CN201310049564X A CN 201310049564XA CN 201310049564 A CN201310049564 A CN 201310049564A CN 103115609 A CN103115609 A CN 103115609A
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Abstract
The invention relates to the field of mapping, and in particular relates to a temperature-based bridge triangulated height transmission correcting method. The correcting method is characterized by at least comprising the following steps of: selecting two measurement results of bridge triangulated height measurement and environment temperatures in measurement at will; according to the environment temperatures, calculating bridge deformation along with the environment temperature variation between the two triangulated height measurement; and correcting any one of the two measurement results according to the bridge deformation. The method has the advantages that the corrected result satisfies data precision requirements, repeated observation can be avoided, the efficiency is improved and the cost is saved.
Description
Technical field
The present invention relates to survey field, be specifically related to transmit modification method based on the bridge triangulated height of temperature.
Background technology
When carrying out second-order levelling, during greater than 3 meters, adopt the method for conventional geometric level to measure comparatively difficulty of the point-to-point transmission discrepancy in elevation when the point-to-point transmission discrepancy in elevation.For this reason, can adopt not the high and high trigonometric leveling of prism of measuring appratus to carry out the elevation transmission.
After on bridge, under bridge, the point-to-point transmission discrepancy in elevation was measured, the discrepancy in elevation of this point-to-point transmission was not changeless, but changes along with the impact of external environment factor.Measure the work of this point-to-point transmission discrepancy in elevation and mainly carry out at night, for this reason, the impact at sunshine can be ignored.Therefore, the principal element that affects this point-to-point transmission discrepancy in elevation is the variation of atmospheric temperature.The impact of temperature on the upper and lower point-to-point transmission discrepancy in elevation of bridge pier is mainly reflected in bridge pier because be out of shape by the linear extendible that temperature variation causes.And present repeatedly between measurement result, often making a difference property is large, and authenticity is not clear, but also does not satisfy the parameter request of high-speed railway standard.
Summary of the invention
The objective of the invention is according to above-mentioned the deficiencies in the prior art part, provide the bridge triangulated height based on temperature to transmit modification method, the method finds out that bridge pier is subjected to influence of temperature change and the rule of linear extendible distortion, on the subsequent measurements bridge, under bridge during the point-to-point transmission discrepancy in elevation, just can correct according to the discrepancy in elevation of this deformation rule to first mensuration, the achievement after correction satisfies accuracy requirement, can avoid repeated measures, raise the efficiency, save cost.
The object of the invention realizes being completed by following technical scheme:
Bridge triangulated height based on temperature transmits modification method, be used for revising the otherness between the repeatedly trigonometric levelling result of carrying out on same bridge, on the bridge of described bridge, be respectively equipped with the forced centering point under bridge, described trigonometric levelling is the discrepancy in elevation of measuring between described two forced centering points, and it is characterized in that: described modification method comprises the following steps at least:
The environment temperature of selecting the test result that any twice described bridge trigonometric levelling obtain and obtaining when measuring at every turn;
According to described environment temperature, calculate the deflection that between twice described trigonometric levelling, described bridge produces along with described variation of ambient temperature;
Use in described twice of described deflection correction arbitrarily described test result once.
Calculating described deflection refers to: use formula
Calculate described deflection, wherein
Be described deflection;
Be twice variation of ambient temperature amount between described trigonometric levelling;
Be the bridge pier height;
Linear expansion coefficient for described bridge pier.
Described bridge pier is reinforced concrete bridge pier, and described linear expansion coefficient adopts the Molded Line expansion coefficient of reinforcing bar.
Described modification method is further comprising the steps of: calculate the difference between described twice triangulated height actual measured results, namely the actual discrepancy in elevation is poor; Calculate the difference between described revised twice measurement of higher degree result, namely the revised discrepancy in elevation is poor.
The difference of the difference of the described actual discrepancy in elevation and the described actual discrepancy in elevation is carried out relatively poor, described relatively poor value is not more than 2mm.
Advantage of the present invention is: the result after correction satisfies accuracy requirement, just can avoid repeated measures, raises the efficiency, and saves cost.
Description of drawings
Fig. 1 is instrument layout schematic diagram of the present invention.
Embodiment
Feature of the present invention and other correlated characteristic are described in further detail by embodiment below in conjunction with accompanying drawing, so that technician's of the same trade understanding:
As shown in Figure 1, in figure, mark 1-4 is respectively: forced centering point 2, observation instrument 3, bridge pier 4 under forced centering point 1, bridge on bridge.
Embodiment: at first adopt the Trigonometric Leveling that not measuring appratus is high, prism is high as shown in Figure 1, distance between forced centering point 2 under forced centering point 1 and bridge on use observation instrument 3 measurement bridges, owing to containing bridge pier 4 under forced centering point on bridge 1 and bridge between forced centering point 2, so the deformation meeting that bridge pier 4 causes because of temperature variation affects on bridge the discrepancy in elevation between forced centering point 2 under forced centering point 1 and bridge, i.e. measurement of higher degree result.
The impact of temperature on the upper and lower point-to-point transmission discrepancy in elevation of bridge pier is mainly reflected in bridge pier 4 because be out of shape by the linear extendible that temperature variation causes.Find out that bridge pier 4 is subjected to influence of temperature change and the rule of linear extendible distortion, on the subsequent measurements bridge, under bridge two force between alignments the discrepancy in elevation time, just can revise the discrepancy in elevation of first mensuration according to this deformation rule.
Bridge pier 4 is mainly reinforced concrete structure, and the rule that reinforced concrete is changed by temperature linearity just can reflect the rule that the bridge pier temperature influence changes indirectly.
The rule that the bridge pier 4 of reinforced concrete structure is changed by temperature linearity can be represented by the formula:
In formula:
---bridge pier temperature influence variable quantity;
---temperature variation;
The linear expansion coefficient of reinforced concrete linear expansion coefficient and reinforcing bar is comparatively approaching, and the Molded Line expansion coefficient of reinforcing bar is 1.2 * 10-5/ ℃.When using this formula, need to verify according to actual conditions, linear expansion coefficient is carried out reasonable value.
According to certain engineering project year June, temperature is 30 ℃ of left and right, and November in the same year, temperature was 15 ℃ of left and right, and February next year, temperature was 5 ℃ of left and right, temperature statistics situation such as table 1 when measuring for three times.
Table 1 is measured the temperature conditions statistical unit three times: ℃
Temperature when measuring according to three times according to above-mentioned correction formula, is revised measuring the discrepancy in elevation, and the revised discrepancy in elevation and the actual measurement discrepancy in elevation compare, and comparable situation is as shown in table 2-1, table 2-2.Additionally need to illustrate: correction formula is calculated herein
Incorporate in the result of the measurement of higher degree, namely compare when measuring for the first time when measuring for the second time, bridge pier 4 causes expansion because temperature raises, thereby causes measurement of higher degree result excessive, and this moment is just with its variable quantity
Deduct, to revise temperature to the impact of measurement of higher degree result; Otherwise bridge pier 4 causes shrinkage because temperature reduces, and this moment is just with its variable quantity
Add, generally speaking, when twice is measured, different environment temperatures turns to identical environment temperature, and calculate the deflection of bridge pier 4 this moment again, with this deflection correction measurement of higher degree result.
Difference and the temperature impact of the table 2-1 actual measurement discrepancy in elevation change comparison sheet unit: mm
Difference and the temperature impact of the table 2-2 actual measurement discrepancy in elevation change comparison sheet unit: mm
H in table 2-1,2-2
1,2Represent the poor of the 1st time and the 2nd time actual measurement discrepancy in elevation ..., △ h
1,2Calculate gained by correction formula according to temperature variation ..., h
1,2-△ h
1,2Representing relatively poor with difference and the temperature impact variation of the 2nd the actual measurement discrepancy in elevation the 1st time, is the comparison between comparison between the 2nd time and the 3rd discrepancy in elevation and the 1st time and the 3rd discrepancy in elevation by that analogy.
The discrepancy in elevation of calculating by correction formula is poor with the actual discrepancy in elevation of measuring, difference maximal value-1.83mm, and the difference that satisfies each time of high-speed railway standard intermediate cam measurement of higher degree measured value is not more than the regulation of 2mm.For this reason, the method for by this formula, the trigonometric levelling achievement being revised is feasible.
Claims (5)
1. the bridge triangulated height based on temperature transmits modification method, be used for revising the otherness between the repeatedly trigonometric levelling result of carrying out on same bridge, on the bridge of described bridge, be respectively equipped with the forced centering point under bridge, described trigonometric levelling is the discrepancy in elevation of measuring between described two forced centering points, and it is characterized in that: described modification method comprises the following steps at least:
The environment temperature of selecting the test result that any twice described bridge trigonometric levelling obtain and obtaining when measuring at every turn;
According to described environment temperature, calculate the deflection that between twice described trigonometric levelling, described bridge produces along with described variation of ambient temperature;
Use in described twice of described deflection correction arbitrarily described test result once.
2. the bridge triangulated height based on temperature according to claim 1 transmits modification method, it is characterized in that: calculate described deflection and refer to: use formula
Calculate described deflection, wherein
Be described deflection;
Be twice variation of ambient temperature amount between described trigonometric levelling;
Be the bridge pier height;
Linear expansion coefficient for described bridge pier.
3. the bridge triangulated height based on temperature according to claim 2 transmits modification method, and it is characterized in that: described bridge pier is reinforced concrete bridge pier, and described linear expansion coefficient adopts the Molded Line expansion coefficient of reinforcing bar.
4. the bridge triangulated height based on temperature according to claim 1 transmits modification method, and it is characterized in that: described modification method is further comprising the steps of: calculate the difference between described twice triangulated height actual measured results, namely the actual discrepancy in elevation is poor; Calculate the difference between described revised twice measurement of higher degree result, namely the revised discrepancy in elevation is poor.
5. that states according to claim 4 transmits modification method based on the bridge triangulated height of temperature, it is characterized in that: the difference of the difference of the described actual discrepancy in elevation and the described actual discrepancy in elevation is carried out relatively poor, described relatively poor value is not more than 2mm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130332063A1 (en) * | 2012-06-10 | 2013-12-12 | Apple Inc. | Road height generation for a road network |
| CN104567800A (en) * | 2014-12-26 | 2015-04-29 | 中铁大桥勘测设计院集团有限公司 | Transmitting and measuring method of sea-crossing height |
| US9208601B2 (en) | 2012-06-10 | 2015-12-08 | Apple Inc. | Computing plausible road surfaces in 3D from 2D geometry |
| CN113884056A (en) * | 2021-10-14 | 2022-01-04 | 中铁大桥局第九工程有限公司 | Measuring method for large-span continuous beam hanging basket cantilever cast-in-place beam |
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| CN102288156A (en) * | 2011-07-20 | 2011-12-21 | 中铁四局集团第一工程有限公司 | Second-class bench mark on-bridge measurement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102288156A (en) * | 2011-07-20 | 2011-12-21 | 中铁四局集团第一工程有限公司 | Second-class bench mark on-bridge measurement method |
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| 梁万波: ""高墩桥梁高程传递测量施工技术"", 《黑龙江科技信息》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130332063A1 (en) * | 2012-06-10 | 2013-12-12 | Apple Inc. | Road height generation for a road network |
| US9207094B2 (en) * | 2012-06-10 | 2015-12-08 | Apple Inc. | Road height generation for a road network |
| US9208601B2 (en) | 2012-06-10 | 2015-12-08 | Apple Inc. | Computing plausible road surfaces in 3D from 2D geometry |
| CN104567800A (en) * | 2014-12-26 | 2015-04-29 | 中铁大桥勘测设计院集团有限公司 | Transmitting and measuring method of sea-crossing height |
| CN113884056A (en) * | 2021-10-14 | 2022-01-04 | 中铁大桥局第九工程有限公司 | Measuring method for large-span continuous beam hanging basket cantilever cast-in-place beam |
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| CN103115609B (en) | 2016-12-28 |
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