CN102995562A - High-accuracy control method of construction of large temporary steel structure slideway platform of steel truss girder - Google Patents
High-accuracy control method of construction of large temporary steel structure slideway platform of steel truss girder Download PDFInfo
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- CN102995562A CN102995562A CN2012103307830A CN201210330783A CN102995562A CN 102995562 A CN102995562 A CN 102995562A CN 2012103307830 A CN2012103307830 A CN 2012103307830A CN 201210330783 A CN201210330783 A CN 201210330783A CN 102995562 A CN102995562 A CN 102995562A
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Abstract
The invention relates to construction of a large steel structure suitable for a temporary pier of the steel truss girder under the circumstance that the existing line is busy, and particularly relates to a high-accuracy control method for elevation of a large temporary steel structure slideway platform of the steel truss girder. The method comprises the steps of controlling and measuring at the construction preparation stage; measuring a control net on the plane by a GPS (global position system) or a total station; measuring the elevation by optical or digital level instrument; controlling the construction process; simulating paying-off of the pier position and the temporary facility position on the chart in advance according to the topographic map; construction stage of an abutment body; counter check on the control net and a benchmark at fixed period to ensure the measurement accuracy; monitoring the construction process; laying observation points at the center and node of a lower chord main girder of the steel truss girder; ensuring the deformation and the stability of the bracket and the girder body in the controlled range in the dragging process, and avoiding distortion of stress of the girder after dragging to the place. By adopting the high-accuracy control method, the accuracy of the temporary pier can be ensured; the security of the existing line is ensured; and the high-accuracy control method is simple in construction technology, wide in application range, and simple and convenient to operate.
Description
Technical field
The present invention relates to carry out in applicable both wired busy situations the high-accuracy control method of the large-scale temporary steel structure of construction, the particularly steel truss girder slideway platform absolute altitude that the steel truss girder temporary rest pier is large-scale steel structure.
Background technology
Along with expanding economy, the progress of science and technology, the infrastructure construction development of China is rapid, and the steel truss girder hauling construction frequently occurs in striding the existing line construction.Solved when both wired steel truss girder is dilatory both wired security implication and special steel truss girder is constructed of existing Business Line landform were become the emphasis of construction, the construct practicality of medium-and-large-sized steel work temporary rest pier of steel truss girder is also more and more, and the required precision of interim Large Steel buttress is also more and more higher.Must need to occur high-precision control method and reach requirement, at present, temporarily without more high-precision measuring method.
Summary of the invention
To the objective of the invention is in order both solving under wired MODEL OVER COMPLEX TOPOGRAPHY, both to guarantee under wired safe prerequisite the high-accuracy control method of the large-scale temporary steel structure of simple and practical steel truss girder slideway platform absolute altitude.
The present invention adopts following technical scheme:
The high-accuracy control method of the large-scale temporary steel structure of a kind of steel truss girder slideway platform construction, carry out as follows:
The control survey of a, Construction in Preparatory Stage:
The all fronts basic plane control anastomose of horizontal control network utilization design cross-post closes construction bridges and lays track plan control net; The measuring apparatus equipment configuration according to unit in charge of construction is implemented in the measurement of construction control network, and the plane adopts GPS or total powerstation that the control net is measured, and elevation adopts optics or the sub-level gauge of number that can satisfy the construction control network precision to measure; After vertical control network is finished, stride the laying that part is carried out vertical control network for the bridge steel structure hole, reference point and deformation observation point is set;
B, construction process control:
According to topographic map, in advance pier location and temporory structure position are simulated unwrapping wire at figure; After will making a record construct influential pipeline and works, carry out on-the-spot physical location setting-out;
C, pier body construction stage:
Regularly control net and bench mark are checked, guarantee the accuracy of measuring; Measurement setting-out and the template detection of control links; After pier shaft is finished, in the pier shaft both sides observation mark is set, requires to carry out settlement observation according to second-order levelling; After the falsework foundation construction is complete, settlement observation staff is set equally, do settlement observation according to the standard identical with pier shaft;
After bridge pier top cap is finished, bench mark need to be caused on the cap of top, and pursue the pier translocation, height measurement adopts long steel ruler to be measured as the master in conjunction with level gauge, and carry out triangulated height with 1 second precision total powerstation and check, after Bridge Pier Construction is finished bench mark is caused Dun Ding, the large-scale temporary structure slideway of convenient control upper steel trusses platform height; During the temporary structure construction, measure according to the bridge construction precision;
D, the monitoring of steel truss girder work progress:
Sedimentation and the displacement observation of monitoring temporary structure thing, and level and the vertically monitoring of off normal in the steel truss girder traveling process at lower edge main truss center and the node of steel truss girder, are laid observation point;
When steel truss girder is drawn, before steel truss girder reaches design attitude, to in time measure physical location and the theoretical position deviation of beam body, then in time the beam body is rectified a deviation, also to arrange falsework is carried out simultaneously the monitoring of stressed rear distortion, according to the timely feedback information of observed result, take appropriate measures, guarantee to draw the distortion of process medium-height trestle and beam body and stablize all at controlled area charactert.
After dilatory the putting in place, the beam process that falls will be laid the control point at the beam body, and monitoring each the fulcrum falling speed of beam process central sill body that falls is synchronous, avoids occuring beam body distortion stressing conditions.
Adopt the present invention of technique scheme compared with prior art, can guarantee the precision of temporary rest pier to both wired safety was guaranteed, and construction technology is simple, applied widely, simple to operation.
Preferred version of the present invention is:
Among the described step a, at least three of the settings of reference point; When good or observation project is few when observation condition, direct measurement deformation observation point on reference point; Deformation observation point arranges in pier construction and falsework work progress, is used for monitoring the stability of falsework.
Among the described step b, the method collection that utilizes total powerstation digitized mapping, GPSRTK digitized mapping method or transit subtense technique is main positions, on-the-spot railway related facility and the topography and geomorphology data of wired side slope, curb both, be depicted as digital topography map, for construction control provides the computer simulation basic data, and for Optimizing Construction Scheme with improve the row job practices spatial data is provided.
Among the described step b, the method collection that utilizes total powerstation digitized mapping, GPSRTK digitized mapping method or transit subtense technique is main positions, on-the-spot railway related facility and the topography and geomorphology data of wired side slope, curb both, are depicted as digital topography map.
Among the described step a, when poor or observation project is many when observation condition, working base point is set, working base point is selected in stable position.
Described vertical control network design cross-post is fourth class levelling network, encrypts bench mark according to fourth class levelling network before the construction.
After described vertical control network is finished, layout by the order of bench mark, reference point, working base point and deformation observation point successively, then utilize working base point to survey the deformation observation point height.
Described track plan control screen cloth net precision and requirement meet " railroad survey standard ", select the plane control network level corresponding with construction bridges to lay.
Description of drawings
Fig. 1 is job site image data figure.
Fig. 2 is the schematic diagram that order is layouted among the embodiment.
Fig. 3 is the schematic diagram of deformation observation point position.
Fig. 4 is the control measurement schematic diagram in the dilatory process.
The specific embodiment
Below in conjunction with embodiment in detail the present invention is described in detail:
The high-accuracy control method of the large-scale temporary steel structure of a kind of steel truss girder slideway platform construction, carry out as follows:
The control survey of Construction in Preparatory Stage: all fronts basic plane control anastomose of horizontal control network utilization design design cross-post closes the concrete condition of construction bridges and lays track plan control net; Track plan control screen cloth net precision and requirement meet " railroad survey standard ", select the plane control network level corresponding with construction bridges to lay.
In the present embodiment, engineering cloth network level and technical requirements are as shown in the table:
The measuring apparatus equipment configuration according to unit in charge of construction is implemented in the measurement of construction control network, and the plane adopts GPS or total powerstation that the control net is measured, and elevation adopts optics or the sub-level gauge of number that can satisfy the construction control network precision to measure; After vertical control network is finished, stride the laying that part is carried out vertical control network for the bridge steel structure hole, reference point and deformation observation point is set; At least three of the settings of reference point; When good or observation project is few when observation condition, direct measurement deformation observation point on reference point; Deformation observation point arranges in pier construction and falsework work progress, is used for monitoring the stability of falsework.
After vertical control network is finished, successively according to the order of bench mark, reference point, working base point and deformation observation point, then utilize working base point to survey the deformation observation point height.
Vertical control network design cross-post is fourth class levelling network, encrypts bench mark according to fourth class levelling network before the construction.The technical requirements of fourth class levelling network is as shown in the table:
When poor or observation project is many when observation condition, working base point is set, working base point is selected in stable position, for example on the bridge pier or position fixing and that conveniently observe.In the present embodiment, shown in accompanying drawing 1, bench mark is set to five, and reference point is set to three, one of working base point, two of deformation observation points.
Construction process control:
The method collection that utilizes total powerstation digitized mapping, GPS RTK digitized mapping method or transit subtense technique is main positions, on-the-spot related facility and the topography and geomorphology data of wired side slope, curb etc. both, are depicted as digital topography map.
According to topographic map, in advance pier location and temporory structure position are simulated unwrapping wire at figure; After will making a record construct influential pipeline and works, carry out on-the-spot physical location setting-out; And to influential pipeline or all works carry out for processing.
The pier body construction stage:
Regularly control net and bench mark are checked, guarantee the accuracy of measuring; According to " passenger-cargo co railway bridges and culverts Construction Technology guide " and " railway bridges and culverts engineering construction quality acceptance criteria ", measurement setting-out and the template detection of control links; After pier shaft is finished, in the pier shaft both sides observation mark is set, as shown in Figure 3, requires to carry out settlement observation according to second-order levelling; After the falsework foundation construction is complete, settlement observation staff is set equally, do settlement observation according to the standard identical with pier shaft.
After bridge pier top cap is finished, bench mark need to be caused on the cap of top, and pursue the pier translocation, height measurement adopts long steel ruler to be measured as the master in conjunction with level gauge, and carry out triangulated height with 1 second precision total powerstation and check, after Bridge Pier Construction is finished bench mark is caused Dun Ding, the large-scale temporary structure slideway of convenient control upper steel trusses platform height; During the temporary structure construction, measure according to the bridge construction precision.
The monitoring of steel truss girder work progress:
The dilatory process of steel truss girder is the emphasis of whole construction, and level and vertically off normal monitoring are most important to putting a dilatory process in order in the sedimentation of temporary structure thing and displacement survey and the steel truss girder traveling process.After passed examination is finished in the steel truss girder assembly unit, at the lower edge main truss center of steel truss girder and the position such as node lay observation point; Layout the position to be convenient to observation and can in work progress, not destroy.
Before dilatory, according to dilatory plan node, theoretical coordinate and the elevation of the in-position, monitoring point of beam body have been calculated.
When steel truss girder is drawn, before steel truss girder reaches design attitude, to in time measure physical location and the theoretical position deviation of beam body, then in time the beam body is rectified a deviation, also will arrange falsework is carried out simultaneously the monitoring of stressed rear distortion, according to the calculated description result, in stressed least favorable situation, the monitoring point is set, according to the timely feedback information of monitoring result, take measures, guarantee to draw the distortion of engineering support (support is the part of temporary steel structure) and beam body and stablized all at controlled area charactert; Monitoring position is anticipated as shown in Figure 4 in the dilatory process.A, B point is steel truss girder beam-ends central point, and coordinate shown in A, the B point is Measured Coordinates in the dilatory process; 2 of C, D are respectively the bridge pier centerline 111 and No. 112, shown in coordinate be the design theory coordinate, by calculating the relation of A, B point and C, D, A, B, C, D should be located along the same line in theory, the line of ordering as A, B and the line of C, D be not point-blank the time, illustrate that steel truss girder beam body position is offset, and need to proofread and correct.After dilatory the putting in place, the beam process that falls will be laid the control point at the beam body, and monitoring each the fulcrum falling speed of beam process central sill body that falls is synchronous, avoids occuring beam body distortion stressing conditions.
Claims (8)
1. the high-accuracy control method of the large-scale temporary steel structure of a steel truss girder slideway platform construction, carry out as follows:
The control survey of a, Construction in Preparatory Stage:
The all fronts basic plane control anastomose of horizontal control network utilization design cross-post closes the concrete condition of construction bridges and lays track plan control net; The measuring apparatus equipment configuration according to unit in charge of construction is implemented in the measurement of construction control network, and the plane adopts GPS or total powerstation that the control net is measured, and elevation adopts optics or the sub-level gauge of number that can satisfy the construction control network precision to measure; After vertical control network is finished, stride the laying that part is carried out vertical control network for the bridge steel structure hole, reference point and deformation observation point is set;
B, construction process control:
According to topographic map, in advance pier location and temporory structure position are simulated unwrapping wire at figure; After will making a record construct influential pipeline and works, carry out on-the-spot physical location setting-out;
C, pier body construction stage:
Regularly control net and bench mark are checked, guarantee the accuracy of measuring; Measurement setting-out and the template detection of control links; After pier shaft is finished, in the pier shaft both sides observation mark is set, requires to carry out settlement observation according to second-order levelling; After the falsework foundation construction is complete, settlement observation staff is set equally, do settlement observation according to the standard identical with pier shaft;
After bridge pier top cap is finished, bench mark need to be caused on the cap of top, and pursue the pier translocation, height measurement adopts long steel ruler to be measured as the master in conjunction with level gauge, and carry out triangulated height with 1 second precision total powerstation and check, after Bridge Pier Construction is finished bench mark is caused Dun Ding, the large-scale temporary structure slideway of convenient control upper steel trusses platform height; During the temporary structure construction, measure according to the bridge construction precision;
D, the monitoring of steel truss girder work progress:
Sedimentation and the displacement observation of monitoring temporary structure thing, and level and the vertically monitoring of off normal in the steel truss girder traveling process at lower edge main truss center and the node of steel truss girder, are laid observation point;
When steel truss girder is drawn, when steel truss girder reaches design attitude, to in time measure physical location and the theoretical position deviation of beam body, then in time the beam body is rectified a deviation, also to arrange falsework is carried out simultaneously the monitoring of stressed rear distortion, guarantee to draw the distortion of engineering support and beam body and stablized all at controlled area charactert;
After dilatory the putting in place, the beam process that falls will be laid the control point at the beam body, and monitoring each the fulcrum falling speed of beam process central sill body that falls is synchronous, avoids occuring beam body distortion stressing conditions.
2. the high-accuracy control method of the large-scale temporary steel structure of steel truss girder according to claim 1 slideway platform construction is characterized in that: among the described step a, and at least three of the settings of reference point; When good or observation project is few when observation condition, direct measurement deformation observation point on reference point; Deformation observation point arranges in pier construction and falsework work progress, is used for monitoring the stability of falsework.
3. the high-accuracy control method of the large-scale temporary steel structure of steel truss girder according to claim 1 slideway platform construction, it is characterized in that: among the described step b, the method collection that utilizes total powerstation digitized mapping, GPSRTK digitized mapping method or transit subtense technique is main positions, on-the-spot railway related facility and the topography and geomorphology data of wired side slope, curb both, are depicted as digital topography map.
4. the high-accuracy control method of the large-scale temporary steel structure of steel truss girder according to claim 1 slideway platform construction, it is characterized in that: among the described step a, when poor or observation project is many when observation condition, working base point is set, working base point is selected in stable position.
5. the high-accuracy control method of the large-scale temporary steel structure of steel truss girder according to claim 1 slideway platform construction is characterized in that: among the described step b, according to topographic map, in advance pier location and temporory structure position are simulated unwrapping wire at figure; After will making a record construct influential pipeline and works, carry out on-the-spot physical location setting-out, and influential pipeline or works are carried out for processing.
6. the high-accuracy control method of the large-scale temporary steel structure of steel truss girder according to claim 1 slideway platform construction is characterized in that: described vertical control network design cross-post is fourth class levelling network, encrypts bench mark according to fourth class levelling network before the construction.
7. according to claim 1 or the high-accuracy control method of the large-scale temporary steel structure of 4 described steel truss girders slideway platform construction, it is characterized in that: after described vertical control network is finished, layout by the order of bench mark, reference point, working base point and deformation observation point successively, then utilize working base point to survey the deformation observation point height.
8. the high-accuracy control method of the large-scale temporary steel structure of steel truss girder according to claim 1 slideway platform construction, it is characterized in that: described track plan control screen cloth net precision and requirement meet " railroad survey standard ", select the plane control network level corresponding with construction bridges to lay.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113591186A (en) * | 2021-07-21 | 2021-11-02 | 中铁大桥勘测设计院集团有限公司 | Steel truss manufacturing configuration determining method and system |
| CN114166174A (en) * | 2021-11-10 | 2022-03-11 | 中铁二十局集团第一工程有限公司 | Deformation monitoring system and method for steel truss girder slideway support |
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| CN113591186B (en) * | 2021-07-21 | 2023-09-12 | 中铁大桥勘测设计院集团有限公司 | Method and system for determining manufacturing configuration of steel truss girder |
| CN114166174A (en) * | 2021-11-10 | 2022-03-11 | 中铁二十局集团第一工程有限公司 | Deformation monitoring system and method for steel truss girder slideway support |
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