CN102788594A - Centralizer correction method for total-station instrument or transit instrument - Google Patents
Centralizer correction method for total-station instrument or transit instrument Download PDFInfo
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- CN102788594A CN102788594A CN2012102626260A CN201210262626A CN102788594A CN 102788594 A CN102788594 A CN 102788594A CN 2012102626260 A CN2012102626260 A CN 2012102626260A CN 201210262626 A CN201210262626 A CN 201210262626A CN 102788594 A CN102788594 A CN 102788594A
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Abstract
The invention embodiment provides a centralizer correction method for a total-station instrument or a transit instrument, which includes the steps of: fixing the upper end of a measuring rope at a top plate stable point on a top plate, dropping the measuring rope naturally, lowering a measurement special plummet at the lower end of the measuring rope to the floor, and marking a floor point; erecting the total-station instrument or the transit instrument right above the floor point by virtue of an instrument bracket, setting the current direction as 0-degree direction, aligning the centralizer to the floor point, and keeping a cross wire or a dot of the centralizer on a same plumb line with the measuring rope; and according to the relative positions of the cross wire or the dot of the centralizer and a reference point, adjusting and correcting a screw. Compared with the prior art, the centralizer correction method accomplishes the centering operation by utilizing the plummet and adjusts the instrument in left, right and other directions through the relative positions of the centralizer and a targeted point, so that the instrument achieves the requirement for centering and leveling. The method fully utilizes the existing structure of the instrument, is easy to carry out, does not increase the complexity, and can meet the instrument correction demand in scenes such as construction scenes and indoor scenes.
Description
Technical field
The present invention relates to relate to the engineering measuring technology field, particularly a kind of total powerstation or the bearing calibration of transit centralizer.
Background technology
Total powerstation or transit are a kind of precision and highly sensitive gauging instrument, and the correctness of centralizer is to weigh a basic parameter of a gauging instrument accuracy, directly has influence on the service precision of instrument, and this work is the key link of surveying work.
Because measuring accuracy is had relatively high expectations under the execution conditions such as tunnel or tunnel, require survey crew to often calibrating and the correction of instrument centralizer.Total powerstation or transit are that (transverse axis, vertical pivot, collimation axis) need satisfy certain geometric condition except three macro-axis; The instrument that wherein self has optical centering device or laser alignment device also must satisfy centering optics (or laser) vertical line and overlap with vertical pivot; Otherwise; Very easily cause the error of centralization, the error of centralization for minor face take measurement of an angle the influence very big.In the work progress such as tunnel or tunnel, total powerstation or transit centralizer error surpass code requirement will directly influence the precision of lead, center line, even influence the technical quality requirement in tunnel or tunnel etc.Therefore the surveying instrument centralizer to often be tested and proofread and correct.Because tracerse point, centerline in tunnel or the tunnel etc. all are laid on the top board, just require instrument centring under point device must satisfy code requirement (1mm).
, deviation will arrive the maintenance of returning home of surveying instrument maintenance store and instrument plant after appearring in the instrument centralizer in the past; The method has avoided the surveying work person in real work, to be forbidden to influence surveying work because of the instrument centralizer; But it is higher to have had a strong impact on measuring task progress and cost; The centering horizontalization work of prior art total powerstation or transit is stretched and is realized through instrument support (for example foot rest etc.) slippage; But in both influenced the precision of measurement data with the horizontalization link, influence the efficient of surveying work again, instrument support (for example foot rest etc.) the flexible adjusting beginner of slippage is difficult for grasping; Survey crew need pass through long training could better grasp this method, is unfavorable for the efficient propelling of surveying work.
Summary of the invention
In order to overcome the above problems, the present invention proposes a kind of total powerstation or the bearing calibration of transit centralizer, and the method is compared simple and practical with existing other method, has greatly promoted the preceding instrumental correction efficient of measuring task.
The embodiment of the invention provides a kind of total powerstation or the bearing calibration of transit centralizer, comprises the step that sets up standard a little, the step of instrument centering and the step of instrument horizontalization,
The step of set standard point is that with measuring the stability of cavern roof point that the cotton rope upper end is fixed on top board, it is sagging naturally to measure cotton rope, transfers measurement cotton rope lower end measurement industrial siding and weighs down to the floor mark floor point;
The step of said instrument centering does, is erected at total powerstation or transit directly over the point of floor through instrument support, and setting current orientation is 0 degree direction, and centralizer is aimed at the floor point, and the crosshair of centralizer or dot remain on the vertical with the measurement cotton rope;
The step of said instrument horizontalization does, according to the relative position adjustment adjusting screw of centralizer crosshair or dot and standard point.
Preferably, said relative position adjustment adjusting screw according to centralizer crosshair or dot and standard point is:
If floor point is above the crosshair of centralizer on the point or dot; Then loose top screw, tight following screw is not if floor point still overlaps with crosshair or the dot that point is gone up centralizer; Then continue adjustment, crosshair or the dot of going up centralizer until floor point and point overlap;
If floor point is below the crosshair of centralizer on the point or dot; Panasonic limit screw then, tight top screw is not if floor point still overlaps with the crosshair or the dot of last centralizer; Then continue adjustment, crosshair or the dot of going up centralizer until floor point and point overlap;
If the crosshair of floor point centralizer on point or the left of dot; Then loose left side screw, tight the right screw is not if floor point still overlaps with crosshair or the dot that point is gone up centralizer; Then continue adjustment, crosshair or the dot of going up centralizer until floor point and point overlap;
If floor point is right-hand the crosshair of last centralizer or dot; Then loose the right screw, tight left side screw is not if upward the crosshair or the dot of centralizer still overlap for floor point and point; Then continue adjustment, crosshair or the dot of going up centralizer until floor point and point overlap.
Preferably, said relative position adjustment adjusting screw according to centralizer crosshair or dot and standard point is:
If line weighs down tip point the place ahead at the crosshair or the dot of centring under point device; Then loose top screw; Tight following screw; Still do not overlap with the crosshair or the dot of following centralizer if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device;
If line weighs down the rear of tip point at the crosshair or the dot of centring under point device; Panasonic limit screw then; Tight top screw; Still do not overlap with the crosshair or the dot of last centralizer if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device;
If line weighs down tip point at the crosshair of centring under point device or the left of dot; Then loose left side screw; Tight the right screw; Still do not overlap with the crosshair or the dot of centring under point device if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device;
If line weighs down tip point right-hand at the crosshair of centring under point device or dot; Then loose the right screw; Tight left side screw; Still do not overlap with the crosshair or the dot of centring under point device if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device.
Compared with prior art; The present invention utilizes line weigh down to accomplish centering, through the relative position of centralizer and impact point, adjusts instrument from several directions up and down; Make instrument reach the requirement of centering horizontalization; This method makes full use of the instrument existing structure, and easy operating and do not increase additional complexity can satisfy the instrumental correction demand of construction or scene such as indoor; Can find from theoretical analysis and field measurement, the present invention effectively lowering apparatus centralizer error to the influence of the precision of lead, centerline position.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is briefly introduced in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skill in the art; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is total powerstation of the present invention or transit centralizer bearing calibration preferred embodiment schematic flow sheet;
Fig. 2 is total powerstation of the present invention or the bearing calibration of a transit centralizer preferred embodiment synoptic diagram that sets up standard;
Fig. 3 is total powerstation of the present invention or transit centralizer bearing calibration centering horizontalization preferred embodiment synoptic diagram;
Fig. 4 is total powerstation of the present invention or transit centralizer bearing calibration centralizer adjustment horizontalization preferred embodiment synoptic diagram;
Fig. 5 is total powerstation of the present invention or another preferred embodiment schematic flow sheet of transit centralizer bearing calibration;
Wherein, 1 is the floor point, and 5 is the stability of cavern roof point, and 10 for measuring cotton rope, and 11 for measuring the industrial siding bob; It has line and weighs down the tip point, and 30 is that top board, 40 is the floor, and 20 are instrument (including but not limited to total powerstation or transit), and 21 is instrument support; 24 is the centring under point device, and 26 is that point is gone up centralizer, and 50 is panel board, and 51a-51d is an adjusting screw; 51a is the top screw, and 51c is following screw, and 51b is the right screw, and 51d is a left side screw.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer, will combine accompanying drawing that the present invention is done to describe in detail further below, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making all other embodiment that obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
When total powerstation according to the invention or transit centralizer bearing calibration operation; See shown in Figure 2; Usually instrument 20 (including but not limited to total powerstation or transit) is placed on the instrument support 21, instrument 20 comprises a little at least a in centralizer 26 and the centring under point device 24, usually; A bit go up centralizer 26 on the instrument 20 that has and do not have centring under point device 24; On the instrument 20 that has a bit down centralizer 24 and not point go up centralizer 26, and on the instrument 20 that has simultaneously a bit down centralizer 24 go up centralizer 26 with point, the present invention all is suitable for above instrument 20.
Centralizer according to the invention both can be crosshair, also can be dot, and the present invention does not have specific qualification to this.
A kind of total powerstation of the present invention or the bearing calibration of transit centralizer, typical implementing procedure, as shown in Figure 1, comprising:
101, set up standard a little step
With measuring the stability of cavern roof point 5 that cotton rope 10 upper ends are fixed on top board 30, it is sagging naturally to measure cotton rope, transfers and measures cotton rope lower end line bob 11 to the floor 40, marks floor point 1, and 1 diameter is put less than 1mm in said floor, and is as shown in Figure 2.
Said measurement cotton rope is for measuring special-purpose cotton rope, and an end has measures the industrial siding bob.
102, the step of instrument centering
Behind the mark floor point 1, will measure cotton rope and accept, be erected at instrument 20 directly over the floor point 1 through instrument support 20, as shown in Figure 3, suppose that current orientation is 0 to spend direction, centralizer aligning floor point 1;
Further,, repeat above step, make centralizer aim at floor point 1 the instrument anglec of rotation 90.
Said angle Q scope is [0,180] degree, preferred 90 degree and 180 degree, sense of rotation clockwise or counterclockwise all can, do not have qualification especially.
Said floor point 1 can be a round dot, also can be a cross point.
Through this step, make instrument and floor point 1 and stability of cavern roof point 5 on same pedal line, realize the centering of instrument.
103, the step of instrument horizontalization
Whether a bit last centralizer is set or/and the centring under point device adopts following mode to carry out horizontalization according to instrument.
Centralizer adjustment horizontalization on the 103-1 point
Open the centralizer protecting cover, the relative position of the crosshair of centralizer 26 or dot and floor point 1 on the observation point according to four adjusting screws of relative position adjustment, particularly, comprising:
A1) in the adjustment of above-below direction horizontalization, said above-below direction is meant observer's front and back;
If floor point 1 above the crosshair of centralizer on the point or dot, then loose top screw, tight following screw; Optional, during the tight following screw of loose top screw adjustment earlier half the, then the adjustment of fine motion instrument base horizontalization second half (it will be apparent to those skilled in the art that; Can certainly only reach horizontalization through the adjustment adjusting screw; But fine motion instrument base another part again after an adjusting screw adjustment part can be eliminated the injustice influence that different azimuth causes, and reaches better horizontalization effect; The adjusting range of said adjusting screw is optional; For example 1/3,1/4 etc. can, do not have special qualification, can reach the horizontalization effect the soonest but adjust half; This mode is equally applicable to the follow-up horizontalization adjustment of this paper); If floor point 1 does not still overlap with crosshair or dot that point is gone up centralizer, then continue adjustment (proceeding the step of instrument horizontalization), crosshair or the dot of going up centralizer until floor point 1 and point overlap.
As shown in Figure 4, floor point 1 is then loose top screw 51a above the crosshair of centralizer 26 on the point or dot, tight following screw 51b; Optional, during the tight following screw 51b of loose top screw 51a adjustment earlier half the, fine motion instrument base horizontalization adjustment then; If floor point 1 does not still overlap with crosshair or dot that point is gone up centralizer, then continue adjustment, crosshair or the dot of going up centralizer until floor point 1 and point overlap.
If floor point 1 below the crosshair of last centralizer or dot, Panasonic limit screw then, tight top screw; Optional, adjust half earlier during the screw of the tight top of Panasonic's limit screw, fine motion instrument base horizontalization adjustment then; If floor point 1 does not still overlap with crosshair or dot that point is gone up centralizer, then continue adjustment, crosshair or the dot of going up centralizer until floor point 1 and point overlap.
B1) in the adjustment of left and right directions horizontalization, said left and right directions is meant observer's right and left;
If the crosshair of floor point 1 centralizer on point or the left of dot, then loose left side screw, tight the right screw; Optional, can the tight the right of the loose left side screw during screw adjustment half the, fine motion instrument base horizontalization adjustment then; If floor point 1 does not still overlap with the crosshair or the dot of last centralizer, then continue adjustment, crosshair or the dot of going up centralizer until floor point 1 and point overlap.
If the crosshair of floor point 1 centralizer on point or dot is right-hand, then loose the right screw, tight left side screw; Optional, can the tight left side of screw, pine the right during screw adjustment half the, fine motion instrument base horizontalization adjustment then; If floor point 1 does not still overlap with crosshair or dot that point is gone up centralizer, then continue adjustment, crosshair or the dot of going up centralizer until floor point 1 and point overlap.
Further, with instrument anglec of rotation Q, repeat above step.
Said angle Q scope is [0,180] degree, preferred 90 degree and 180 degree, sense of rotation clockwise or counterclockwise all can, do not have qualification especially.
The above is adjusted and adjusts at the left and right directions horizontalization at the above-below direction horizontalization; Both can carry out the adjustment of above-below direction horizontalization adjustment carrying out again left and right directions horizontalization earlier; Also can carry out the adjustment of left and right directions horizontalization adjustment carrying out again above-below direction horizontalization earlier, on order, not have special the qualification.
103-2 centring under point device adjustment horizontalization
Equally; To guarantee that before adjustment top board hanging wire point, instrument centring under point device and floor are o'clock on a pedal line; The telescope axle is perpendicular to the instrument vertical pivot; The telescope axle is collimation axis, when the adjustment centralizer, requires collimation axis vertical with the instrument vertical pivot, and promptly the perpendicular dish of instrument is 90 degree to 0 degree orientation for zenith distance.
The crosshair of centralizer 24 or dot and line weigh down the relative position of tip point under the observation point, adjust according to relative position, particularly, comprising:
A2) adjust at the fore-and-aft direction horizontalization
If line weighs down tip point in the place ahead of the crosshair or the dot of centring under point device 24 (object lens), then loose front screw, tight back screw; Optional, elder generation adjusts half during the screw of loose front, adjusts half earlier during the screw of tight back; Still do not overlap with the crosshair or the dot of following centralizer if line weighs down tip point, then continue adjustment (proceeding the step of instrument horizontalization), weigh down tip point until line and overlap with the crosshair or the dot of centring under point device.
If line weighs down tip point at the rear of the crosshair or the dot of centring under point device (eyepiece), then loose back screw, tight front screw; Optional, elder generation adjusts half during the screw of loose back, adjusts half earlier during the screw of tight front; Still do not overlap with the crosshair or the dot of last centralizer if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device.
B2) adjust at the left and right directions horizontalization
If line weighs down tip point at the crosshair of centring under point device or the left of dot, then loose left side screw, tight the right screw.Optionally, can the loose left side during screw adjustment earlier half, adjust half during the screw of tight the right; Still do not overlap with the crosshair or the dot of centring under point device if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device.
If line weighs down tip point right-hand at the crosshair of centring under point device or dot, then pine the right screw, tightly left side screw.Optionally, can pine the right during screw adjustment earlier half, adjust half during the screw of the tight left side; Still do not overlap with the crosshair or the dot of centring under point device if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device.
Further, with instrument anglec of rotation Q, repeat above step.
Optional, said angle Q scope is [0,180] degree, preferred 90 degree and 180 degree, sense of rotation clockwise or counterclockwise all can, do not have qualification especially.
The above the above the adjustment of fore-and-aft direction horizontalization with adjust at the left and right directions horizontalization; Both can carry out the adjustment of fore-and-aft direction horizontalization adjustment carrying out again left and right directions horizontalization earlier; Also can carry out the adjustment of left and right directions horizontalization adjustment carrying out again fore-and-aft direction horizontalization earlier, on order, not have special the qualification.
But as a kind of embodiment, as shown in Figure 5, after the step of instrument horizontalization, carry out the whether judgement of centering horizontalization, if, then accomplish trimming process, otherwise, the step of repetition instrument centering and the step of instrument horizontalization returned, until accomplishing trimming process.This enforcement makes in trimming process, in carry out repeatedly with horizontalization, back and forth can reach calibration result preferably through two processes.
Whether weighing down tip point with line through centralizer under the observation point overlaps; Do not overlap then loosening or tighten four screws; Adjustment centralizer center is weighed down tip point with line and is overlapped; And the anglec of rotation further guarantees to overlap, and gib screw get final product then, and above step makes that instrument centralizer center all overlaps with line bob tip point in any direction.
Especially; For the instrument that does not have the centring under point device; Guaranteeing that under the vertical situation of collimation axis and vertical pivot line being weighed down tip point institute annotates a bit if overlap and be alignment on the instrument at 0 degree and 90 scales respectively the telescopical top of instrument at 2; If do not overlap, that is to say that the instrument that does not have the centring under point device can adopt this method mark to get final product by the above step adjustment.
The present invention utilizes line to weigh down and accomplishes centering; Relative position through centralizer crosshair or dot and standard point; Adjust instrument from several directions up and down, make instrument reach the requirement of centering horizontalization, this method makes full use of the instrument existing structure; Easy operating and do not increase additional complexity; Can satisfy the instrumental correction demand of construction or scene such as indoor, can find from theoretical analysis and field measurement, the present invention effectively lowering apparatus centralizer error influences the precision of lead, centerline position.
More than be merely the preferable embodiment of the present invention; But protection scope of the present invention is not limited thereto; Any technician who is familiar with the present technique field is in the technical scope that the embodiment of the invention discloses, and the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (9)
1. total powerstation or the bearing calibration of transit centralizer comprise the step that sets up standard a little, the step of instrument centering and the step of instrument horizontalization, it is characterized in that,
The step of set standard point is that with measuring the stability of cavern roof point that the cotton rope upper end is fixed on top board, it is sagging naturally to measure cotton rope, transfers measurement cotton rope lower end measurement industrial siding and weighs down to the floor mark floor point;
The step of said instrument centering does, is erected at total powerstation or transit directly over the point of floor through instrument support, and setting current orientation is 0 degree direction, and centralizer is aimed at the floor point, and the crosshair of centralizer or dot remain on the vertical with the measurement cotton rope;
The step of said instrument horizontalization does, according to the relative position adjustment adjusting screw of centralizer crosshair or dot and standard point.
2. according to said total powerstation of claim 1 or the bearing calibration of transit centralizer, it is characterized in that said floor spot diameter is less than 1mm.
3. according to said total powerstation of claim 1 or the bearing calibration of transit centralizer; It is characterized in that the step of said instrument centering also comprises, with total powerstation or transit with instrument anglec of rotation Q; Repeat the step of instrument centering; Make centralizer aim at the floor point, said angle Q scope is [0,180] degree.
4. according to said total powerstation of claim 1 or the bearing calibration of transit centralizer, it is characterized in that the relative position adjustment adjusting screw of said centralizer crosshair or dot and standard point is:
If floor point is above the crosshair of centralizer on the point or dot; Then loose top screw, tight following screw is not if floor point still overlaps with crosshair or the dot that point is gone up centralizer; Then continue adjustment, crosshair or the dot of going up centralizer until floor point and point overlap;
If floor point is below the crosshair of centralizer on the point or dot; Panasonic limit screw then, tight top screw is not if floor point still overlaps with the crosshair or the dot of last centralizer; Then continue adjustment, crosshair or the dot of going up centralizer until floor point and point overlap;
If the crosshair of floor point centralizer on point or the left of dot; Then loose left side screw, tight the right screw is not if floor point still overlaps with crosshair or the dot that point is gone up centralizer; Then continue adjustment, crosshair or the dot of going up centralizer until floor point and point overlap;
If floor point is right-hand the crosshair of last centralizer or dot; Then loose the right screw, tight left side screw is not if upward the crosshair or the dot of centralizer still overlap for floor point and point; Then continue adjustment, crosshair or the dot of going up centralizer until floor point and point overlap.
5. according to said total powerstation of claim 4 or the bearing calibration of transit centralizer, it is characterized in that when pine screw on one side, during tight another side screw, pine screw on one side is half the with each adjustment of tight another side screw, then the adjustment of fine motion instrument base horizontalization second half.
6. according to claim 5 or 6 said total powerstations or the bearing calibration of transit centralizer, it is characterized in that, with instrument anglec of rotation Q, repeat the step of instrument horizontalization, said angle Q scope is [0,180] degree.
7. according to said total powerstation of claim 1 or the bearing calibration of transit centralizer, it is characterized in that said relative position adjustment adjusting screw according to centralizer crosshair or dot and standard point is:
If line weighs down tip point the place ahead at the crosshair or the dot of centring under point device; Then loose top screw; Tight following screw; Still do not overlap with the crosshair or the dot of following centralizer if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device;
If line weighs down the rear of tip point at the crosshair or the dot of centring under point device; Panasonic limit screw then; Tight top screw; Still do not overlap with the crosshair or the dot of last centralizer if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device;
If line weighs down tip point at the crosshair of centring under point device or the left of dot; Then loose left side screw; Tight the right screw; Still do not overlap with the crosshair or the dot of centring under point device if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device;
If line weighs down tip point right-hand at the crosshair of centring under point device or dot; Then loose the right screw; Tight left side screw; Still do not overlap with the crosshair or the dot of centring under point device if line weighs down tip point, then continue adjustment, weigh down tip point until line and overlap with the crosshair or the dot of centring under point device.
8. according to said total powerstation of claim 7 or the bearing calibration of transit centralizer, it is characterized in that when pine screw on one side, during tight another side screw, pine screw on one side is half the with each adjustment of tight another side screw, then the adjustment of fine motion instrument base horizontalization second half.
9. according to claim 7 or 8 said total powerstations or the bearing calibration of transit centralizer, it is characterized in that, with instrument anglec of rotation Q, repeat the step of instrument horizontalization, said angle Q scope is [0,180] degree.
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| CN103680921A (en) * | 2013-12-24 | 2014-03-26 | 天威保变（秦皇岛）变压器有限公司 | Sleeving locating method of coil of large-sized power transformer |
| CN103776467A (en) * | 2014-02-20 | 2014-05-07 | 孙江 | Centering method of laser centering device under control point of theodolite |
| CN103776467B (en) * | 2014-02-20 | 2016-06-22 | 孙江 | The centering method of laser centring device under the control point of theodolite |
| CN108072963A (en) * | 2016-11-11 | 2018-05-25 | 上海宝冶集团有限公司 | Correct method of the optics to prism base |
| CN109425951A (en) * | 2017-08-30 | 2019-03-05 | 上海宝冶集团有限公司 | Optics is to prism base means for correcting and its an application method |
| CN108151723A (en) * | 2017-12-12 | 2018-06-12 | 中国建筑第八工程局有限公司 | The method for correcting prism centering rod |
| CN108151723B (en) * | 2017-12-12 | 2021-05-25 | 中国建筑第八工程局有限公司 | Method for correcting prism centering rod |
| CN108759806A (en) * | 2018-09-12 | 2018-11-06 | 中铁二局第工程有限公司 | A kind of calibration measures centering lever apparatus and its application method |
| CN110849319A (en) * | 2019-11-19 | 2020-02-28 | 陕西交通职业技术学院 | Calibration device and method for Lycra base plummet device |
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| CN102788594B (en) | 2015-12-02 |
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