CN103344214A - 1.6-degree parabolic extralarge pier measuring and pier body linear control method - Google Patents
1.6-degree parabolic extralarge pier measuring and pier body linear control method Download PDFInfo
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- CN103344214A CN103344214A CN2013102817915A CN201310281791A CN103344214A CN 103344214 A CN103344214 A CN 103344214A CN 2013102817915 A CN2013102817915 A CN 2013102817915A CN 201310281791 A CN201310281791 A CN 201310281791A CN 103344214 A CN103344214 A CN 103344214A
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Abstract
The invention discloses a 1.6-degree parabolic extralarge pier measuring and pier body linear control method which comprises a pier measuring method and a pier body linear control method. According to the pier measuring method, control networks are adopted for measuring, the control networks are in quadrangle structures, control points are arranged at the control networks, the control networks include a horizontal control network and an elevation control network, wherein the horizontal control network is distributed in a quartered control network mode, the elevation control network is distributed in a five-share elevation control network mode, base line edges of piers and all the lines of control networks are connected for measurement, and the pier bodies are in parabolic hollow structures. The linear control method comprises the steps of central positioning measurement for hollow piers, and elevation measurement and squareness measurement for the hollow piers, and through measurement on the center and elevation of the hollow piers as well as the squareness of the hollow piers, reference is provided for controlling the elevation presetting-height value. The method disclosed by the invention is simple and convenient to operate, high in pier measurement speed and accurate in control precision; and meanwhile, the pier body linear shape is effectively controlled, the engineering safety coefficient is improved, the control cost is low, and the work efficiency is high.
Description
Technical field
The present invention relates to especially big bridge pier and measure and technical field of construction, be specially the especially big bridge pier of a kind of 1.6 parabolic types and measure and the pier shaft linear control method.
Background technology
Along with the national economy sustained and rapid development, current China is in large span, deep water bridge construction fast-developing period, adopt advanced design and operating technique, reduce investment outlay to reach, the reduction of erection time, guarantee that safe construction target is that engineering circle is pursued always.As 834.12 meters of the ditch grand bridge total lengths of looking as far as one's eyes can see, being positioned at Shaanxi Province's Baishui County heroes village, township ditch " V " font Zhigou of looking as far as one's eyes can see of looking as far as one's eyes can see, bridge site is positioned at loess gully district, and landform is steep, and cheuch is deep; Bridge is high 129 meters, and 105 meters on the highest pier occupies northwest railroad bridge the first, china railway bridge second; Having higher requirement to operating technique in its Special geography position, has also increased difficulty of construction simultaneously.
Traditional Bridge Pier Construction method is by branching standing template on underground pile foundation, then form at the inner concrete perfusion of template, in work progress, shortage is to the pier shaft monitoring of bridge pier, in the work progress of pier shaft, do not consider simultaneously bridge pier sedimentation value and bridge pier vertical deformation, the bridge pier of construction up to hundreds of meters must be considered correlative factors such as geology, wind-force to the influence of bridge pier, otherwise easily causes later stage bridge pier generation gross distortion, has potential safety hazard.
Summary of the invention
Technical matters solved by the invention is to provide the especially big bridge pier of a kind of 1.6 parabolic types to measure and the pier shaft linear control method, to solve the shortcoming in the above-mentioned background technology.
Technical matters solved by the invention realizes by the following technical solutions:
The especially big bridge pier of a kind of 1.6 parabolic types is measured and the pier shaft linear control method, comprise bridge pier measurement and pier shaft linear control method, wherein, bridge pier is measured and is adopted the control net to measure, the control net is quadrilateral structure, control net place is provided with the reference mark, and the control net comprises horizontal control network and vertical control network, horizontal control network is established by fourth class control screen cloth, vertical control network is established by five contour process control screen cloths, and the net translocation is controlled with all fronts in the baseline limit of bridge pier, can effectively guarantee main bridge control survey, measuring speed is fast, and control accuracy is accurate; Pier shaft is the parabolic type hollow-core construction, its linear control method comprises hollow pier centralized positioning measurement, the measurement of higher degree and hollow pier squareness measurement, by measuring hollow pier center, elevation and hollow pier verticality, throw high value in advance for the control elevation reference frame is provided, effectively the control pier shaft is linear simultaneously, improves the engineering safety coefficient.
In the present invention, the reference mark of control net is arranged on outside the working-yard, and adopts concrete to bury underground, and the steel bar end that is carved with "+" is buried on the stake top underground; The reference mark every 2 months repetition measurements once, running check and check during setting-out.
In the present invention, the linear control of pier shaft is mainly by construction survey, and its concrete steps are as follows:
1), after a sections concreting is finished, adopt the triangulated height method to measure the top of concrete elevation, according to the actual measurement absolute altitude, draw this absolute altitude place sectional drawing, and adopt total powerstation to press coordinate method, with the outline line setting-out to top of concrete, as the control baseline of the last sections template of Zhi Li;
2), after a last sections formwork support arrangement finishes, adopt the triangulated height method to measure the template elevation of top surface, and draw place, template top bridge pier cross-sectional view, adopt total powerstation to press coordinate method then, template position is checked in pointwise, if any deviation, adjust, till meeting the requirements;
3), in the concreting process, on 4 long limits of pier shaft template, respectively lay control point, 2 planimetric positions, monitoring at any time, the correction of in time taking measures of pinpointing the problems;
4), above-mentioned steps 1 is carried out in circulation)～3);
5), before the construction of last sections of Dun Ding, the measurement of higher degree adopts triangulated height and two kinds of methods of level elevation steel ruler transmission to carry out simultaneously, checks and can construct after errorless;
6), the measurement of higher degree comprises bridge pier sedimentation and bridge pier vertical deformation
(1) the bridge pier settlement observation comprises that drawing of leveling base survey and measuring method
Settlement observation point adopts the stake of pre-buried steel measuring point, sedimentation measuring point distribution method: each cushion cap is established 4 settlement observation points, and Φ 20 steel bar end measuring points stretch out cushion cap top 3cm, and cushion cap end processing rounding is also coated red paint, or embedded bar is bent cushion cap;
1. leveling base draws survey
The leveling base that settlement observation point is quoted, initial stage is adopted emergence measuring net leveling point, dot spacing is 200m, after the control net is set up completely, change accurate measurement net height journey leveling point into, dot spacing is 150～180m, and will quote settlement observation reduction as a result that emergence measuring net leveling base obtains among accurate measurement net height journey system; Settlement observation is drawn survey from nearest leveling base, check quoting leveling base before drawing survey, check and adopt the repetition measurement mode to carry out, high difference between the adjacent leveling base in front and back and former high difference are compared, when the high difference that detects and former high difference satisfy, namely draw the survey leveling base and be in steady status; Otherwise further repetition measurement;
2. measuring method
Settlement observation is adopted from contiguous leveling point and is surveyed to settlement observation point, is closed to the contact level route method of contiguous another leveling base again, also adopts as required from contiguous leveling base and directly surveys to settlement observation point and come and go the branch road collimation method of survey; Bridge pier monitoring basic point be standard water on schedule, during monitoring by recording each measuring point and leveling point (basic point) the difference of elevation Δ H in t (2) time, can calculate the standard elevation ht(2 of each monitoring point in t (2) time), the elevation ht(1 that records with t (1) time last time then) compares, difference DELTA ht(1,2) be the sedimentation value in t (1)～t (2) time period of this measuring point, that is:
Δht（1，2）=ht（2）-ht（1）
(2) bridge pier vertical deformation
Because the height of 1.6 especially big bridge pier pier shafts of para-curve, to consider the vertical deformation that bridge pier causes because of concrete elastic compression, shrinkage and creep etc. in the work progress, by the test to material mechanical performance, determine concrete elastic modulus and shrinkage and creep coefficient, through FEM (finite element) calculation, and count foundation settlement in the construction, finally determine high value of pre-throwings of bridge pier.
In the present invention, to throw high value in advance be bridge pier sedimentation value and bridge pier vertical deformation sum to elevation.
Beneficial effect
Machine tool required for the present invention is that conventional instrument, its operating procedure are easy; And the bridge pier measuring speed is fast, and control accuracy is accurate; At the observation of the linear control of especially big bridge pier pier shaft, throw high value in advance for the control elevation reference frame is provided, effectively the control pier shaft is linear simultaneously, improves the engineering safety coefficient, and it is low to control cost, the work efficiency height.
Description of drawings
Fig. 1 establishes and main pier relative position synoptic diagram for midplane control screen cloth of the present invention.
Fig. 2 is pier shaft transect layout and compound reference mark synoptic diagram among the present invention.
Fig. 3 arranges front elevation for bridge pier settlement observation point among the present invention.
Fig. 4 arranges vertical view for bridge pier settlement observation point among the present invention.
Wherein, A, B, 1,2 represent planimetric control point respectively among Fig. 1, and the relative position of expression and main pier is used for controlling main pier cope match-plate pattern planimetric position and elevation; 1,2,3,4 expression bridge pier settlement observation points among Fig. 4.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in further detail.
Measure and the pier shaft linear control method referring to the especially big bridge pier of a kind of 1.6 parabolic types of Fig. 1, Fig. 2, Fig. 3, Fig. 4, wherein, bridge pier is measured and is adopted the control net to measure, the control net is quadrilateral structure, control net place is provided with the reference mark, and the control net comprises horizontal control network and vertical control network, horizontal control network is established by fourth class control screen cloth, be provided with 4 reference mark, vertical control network is established by five contour process control screen cloths, and the net translocation is controlled with all fronts in the baseline limit of bridge pier, can effectively guarantee main bridge control survey, measuring speed is fast, and control accuracy is accurate; Pier shaft is the parabolic type hollow-core construction, and the concrete construction procedure of its pier shaft linear control method is as follows:
1), after a sections concreting is finished, adopt the triangulated height method to measure the top of concrete elevation, according to the actual measurement absolute altitude, draw this absolute altitude place sectional drawing, and adopt total powerstation to press coordinate method, with the outline line setting-out to top of concrete, as the control baseline of the last sections template of Zhi Li;
2), after a last sections formwork support arrangement finishes, adopt the triangulated height method to measure the template elevation of top surface, and draw place, template top bridge pier cross-sectional view, adopt total powerstation to press coordinate method then, template position is checked in pointwise, if any deviation, adjust, till meeting the requirements;
3), in the concreting process, on 4 long limits of pier shaft template, respectively lay control point, 2 planimetric positions, monitoring at any time, the correction of in time taking measures of pinpointing the problems;
4), above-mentioned steps 1 is carried out in circulation)～3);
5), before the construction of last sections of Dun Ding, the measurement of higher degree adopts triangulated height and two kinds of methods of level elevation steel ruler transmission to carry out simultaneously, checks and can construct after errorless;
6), the measurement of higher degree comprises bridge pier sedimentation and bridge pier vertical deformation
(1) the bridge pier settlement observation comprises that drawing of leveling base survey and measuring method
Settlement observation point adopts the stake of pre-buried steel measuring point, sedimentation measuring point distribution method: each cushion cap is established 4 settlement observation points, and Φ 20 steel bar end measuring points stretch out cushion cap top 3cm, and cushion cap end processing rounding is also coated red paint, or embedded bar is bent cushion cap;
1. leveling base draws survey
The leveling base that settlement observation point is quoted, initial stage is adopted emergence measuring net leveling point (second-class leveling point, dot spacing 200m), after the control net is set up completely, change accurate measurement net height journey leveling point (second-class leveling point into, and will quote settlement observation reduction as a result that emergence measuring net leveling base obtains among accurate measurement net height journey system dot spacing 160m);
Settlement observation is drawn survey from nearest leveling base, check quoting leveling base before drawing survey, check and adopt the repetition measurement mode to carry out, high difference between the adjacent leveling base in front and back and former high difference are compared, (L is the border on the river distance of accurate intercardinal of two-phase when the high difference that detects and former high difference are satisfied, unit is km) time, namely draw the survey leveling base and be in steady status; Otherwise further repetition measurement;
2. measuring method
Settlement observation is adopted from contiguous leveling point and is surveyed to settlement observation point, is closed to the contact level route method of contiguous another leveling base again, also adopts as required from contiguous leveling base and directly surveys to settlement observation point and come and go the branch road collimation method of survey; Bridge pier monitoring basic point is standard water (elevation is known) on schedule, during monitoring by recording each measuring point and leveling point (basic point) the difference of elevation Δ H in t (2) time, can calculate the standard elevation ht(2 of each monitoring point in t (2) time), the elevation ht(1 that records with t (1) time last time then) compares, difference DELTA ht(1,2) be the sedimentation value in t (1)～t (2) time period of this measuring point, that is:
Δht（1，2）=ht（2）-ht（1）
(2) bridge pier vertical deformation
Because the height of 1.6 especially big bridge pier pier shafts of para-curve, to consider the vertical deformation that bridge pier causes because of concrete elastic compression, shrinkage and creep etc. in the work progress, by the test to material mechanical performance, determine concrete elastic modulus and shrinkage and creep coefficient, through FEM (finite element) calculation, and count foundation settlement in the construction, finally determine high value of pre-throwings of bridge pier.
In the present embodiment, the reference mark of control net is arranged on outside the working-yard, and adopts concrete to bury underground, and the steel bar end that is carved with "+" is buried on the stake top underground; The reference mark every 2 months repetition measurements once, running check and check during setting-out.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (4)
1. the especially big bridge pier of 6 parabolic types is measured and the pier shaft linear control method, comprise bridge pier measurement and pier shaft linear control method, it is characterized in that, bridge pier is measured and is adopted the control net to measure, and the control net is quadrilateral structure, and control net place is provided with the reference mark, and the control net comprises horizontal control network and vertical control network, horizontal control network is established by fourth class control screen cloth, and vertical control network is established by five contour process control screen cloths, and the net translocation is controlled with all fronts in the baseline limit of bridge pier; Pier shaft is the parabolic type hollow-core construction, its linear control method comprises hollow pier centralized positioning measurement, the measurement of higher degree and hollow pier squareness measurement, by measuring hollow pier center, elevation and hollow pier verticality, throw high value in advance for the control elevation reference frame is provided.
2. the especially big bridge pier of a kind of 1.6 parabolic types according to claim 1 is measured and the pier shaft linear control method, it is characterized in that, the reference mark of control net is arranged on outside the working-yard, and adopts concrete to bury underground, and the steel bar end that is carved with "+" is buried on the stake top underground; The reference mark every 2 months repetition measurements once, running check and check during setting-out.
3. the especially big bridge pier of a kind of 1.6 parabolic types according to claim 1 is measured and the pier shaft linear control method, it is characterized in that the linear control concrete steps of pier shaft are as follows:
1), after a sections concreting is finished, adopt the triangulated height method to measure the top of concrete elevation, according to the actual measurement absolute altitude, draw this absolute altitude place sectional drawing, and adopt total powerstation to press coordinate method, with the outline line setting-out to top of concrete, as the control baseline of the last sections template of Zhi Li;
2), after a last sections formwork support arrangement finishes, adopt the triangulated height method to measure the template elevation of top surface, and draw place, template top bridge pier cross-sectional view, adopt total powerstation to press coordinate method then, template position is checked in pointwise, if any deviation, adjust, till meeting the requirements;
3), in the concreting process, on 4 long limits of pier shaft template, respectively lay control point, 2 planimetric positions, monitoring at any time, the correction of in time taking measures of pinpointing the problems;
4), above-mentioned steps 1 is carried out in circulation)～3);
5), before the construction of last sections of Dun Ding, the measurement of higher degree adopts triangulated height and two kinds of methods of level elevation steel ruler transmission to carry out simultaneously, checks and can construct after errorless;
6), the measurement of higher degree comprises bridge pier sedimentation and bridge pier vertical deformation
(1) the bridge pier settlement observation comprises that drawing of leveling base survey and measuring method
Settlement observation point adopts the stake of pre-buried steel measuring point, sedimentation measuring point distribution method: each cushion cap is established 4 settlement observation points, and Φ 20 steel bar end measuring points stretch out cushion cap top 3cm, and cushion cap end processing rounding is also coated red paint, or embedded bar is bent cushion cap;
1. leveling base draws survey
The leveling base that settlement observation point is quoted, initial stage is adopted emergence measuring net leveling point, dot spacing is 200m, after the control net is set up completely, change accurate measurement net height journey leveling point into, dot spacing is 150～180m, and will quote settlement observation reduction as a result that emergence measuring net leveling base obtains among accurate measurement net height journey system; Settlement observation is drawn survey from nearest leveling base, check quoting leveling base before drawing survey, check and adopt the repetition measurement mode to carry out, high difference between the adjacent leveling base in front and back and former high difference are compared, when the high difference that detects and former high difference satisfy, namely draw the survey leveling base and be in steady status; Otherwise further repetition measurement;
2. measuring method
Settlement observation is adopted from contiguous leveling point and is surveyed to settlement observation point, is closed to the contact level route method of contiguous another leveling base again, also adopts as required from contiguous leveling base and directly surveys to settlement observation point and come and go the branch road collimation method of survey; Bridge pier monitoring basic point be standard water on schedule, during monitoring by recording each measuring point and leveling point (basic point) the difference of elevation Δ H in t (2) time, can calculate the standard elevation ht(2 of each monitoring point in t (2) time), the elevation ht(1 that records with t (1) time last time then) compares, difference DELTA ht(1,2) be the sedimentation value in t (1)～t (2) time period of this measuring point, that is:
Δht（1，2）=ht（2）-ht（1）
(2) bridge pier vertical deformation
Because the height of 1.6 especially big bridge pier pier shafts of para-curve, to consider the vertical deformation that bridge pier causes because of concrete elastic compression, shrinkage and creep etc. in the work progress, by the test to material mechanical performance, determine concrete elastic modulus and shrinkage and creep coefficient, through FEM (finite element) calculation, and count foundation settlement in the construction, finally determine high value of pre-throwings of bridge pier.
4. measure and the pier shaft linear control method according to claim 1 or the especially big bridge pier of 3 described a kind of 1.6 parabolic types, it is characterized in that, it is bridge pier sedimentation value and bridge pier vertical deformation sum that elevation is thrown high value in advance.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504962A (en) * | 2017-06-29 | 2017-12-22 | 中交航局第四工程有限公司 | A kind of method using laser plummet apparatus control bridge deck-molding pier stud perpendicularity |
| CN108759775A (en) * | 2018-03-14 | 2018-11-06 | 江苏恒久钢构有限公司 | A kind of method for building up of vertical control network |
| CN110332920A (en) * | 2019-07-08 | 2019-10-15 | 中铁第四勘察设计院集团有限公司 | A kind of undercrossing tunnel bridge deformation monitoring system, method and storage medium |
| CN116136403A (en) * | 2023-04-14 | 2023-05-19 | 中交一航局第一工程有限公司 | Construction measurement method for offshore installation of large prefabricated pier |
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| RU2180430C1 (en) * | 2000-06-26 | 2002-03-10 | Марийский государственный технический университет | Method of control over stability of reference points |
| KR20100048675A (en) * | 2008-10-31 | 2010-05-11 | 현대건설주식회사 | Measuring method and apparatus of bridge displacement by measure of strain |
| 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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2013
- 2013-07-05 CN CN201310281791.5A patent/CN103344214B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2180430C1 (en) * | 2000-06-26 | 2002-03-10 | Марийский государственный технический университет | Method of control over stability of reference points |
| KR20100048675A (en) * | 2008-10-31 | 2010-05-11 | 현대건설주식회사 | Measuring method and apparatus of bridge displacement by measure of strain |
| 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 |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504962A (en) * | 2017-06-29 | 2017-12-22 | 中交航局第四工程有限公司 | A kind of method using laser plummet apparatus control bridge deck-molding pier stud perpendicularity |
| CN108759775A (en) * | 2018-03-14 | 2018-11-06 | 江苏恒久钢构有限公司 | A kind of method for building up of vertical control network |
| CN110332920A (en) * | 2019-07-08 | 2019-10-15 | 中铁第四勘察设计院集团有限公司 | A kind of undercrossing tunnel bridge deformation monitoring system, method and storage medium |
| CN110332920B (en) * | 2019-07-08 | 2024-04-02 | 中铁第四勘察设计院集团有限公司 | System, method and storage medium for monitoring deformation of underpass railway bridge |
| CN116136403A (en) * | 2023-04-14 | 2023-05-19 | 中交一航局第一工程有限公司 | Construction measurement method for offshore installation of large prefabricated pier |
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