CN102995562B - 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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- CN102995562B CN102995562B CN201210330783.0A CN201210330783A CN102995562B CN 102995562 B CN102995562 B CN 102995562B CN 201210330783 A CN201210330783 A CN 201210330783A CN 102995562 B CN102995562 B CN 102995562B
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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 be suitable for the high-accuracy control method that carries out the large-scale temporary steel structure of construction, the particularly steel truss girder slideway platform absolute altitude that steel truss girder temporary rest pier is large-scale steel structure in both wired busy situations.
Background technology
Along with expanding economy, the progress of science and technology, rapidly, steel truss girder hauling construction frequently occurs in across existing line construction in the infrastructure construction development of China.Solve when both wired steel truss girder was dilatory that special construction becomes the emphasis of construction to steel truss girder to both wired security implication and existing Business Line landform, 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 that high-precision control method reaches requirement, at present, temporarily without more high-precision measuring method.
Summary of the invention
To the object of the invention is in order both solving under wired MODEL OVER COMPLEX TOPOGRAPHY, both to ensure 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:
A high-accuracy control method for the large-scale temporary steel structure of steel truss girder slideway platform construction, carries 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 plane adopts GPS or total powerstation to measure controlling net, and elevation adopts optics or the sub-level gauge of number that can meet construction control network precision to measure; After vertical control network completes, carry out the laying of vertical control network across part for bridge steel structure hole, reference point and deformation observation point are set;
B, construction process control:
According to topographic map, in advance pier location and temporory structure position are simulated to unwrapping wire on figure; After making a record construct influential pipeline and works, carry out on-the-spot physical location setting-out;
C, pier body construction stage:
Regularly check controlling net and bench mark, ensure the accuracy of measuring; Control measurement setting-out and the template detection of links; After pier shaft completes, in pier shaft both sides, observation mark is set, requires to carry out settlement observation according to second-order levelling; After 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 completes, bench mark need to be caused on the cap of top, and carry out by pier translocation, height measurement adopts long steel ruler to be measured as master in conjunction with level gauge, and carry out triangulated height with 1 second precision total powerstation and check, after Bridge Pier Construction completes, bench mark is caused to Dun Ding, the convenient large-scale temporary structure slideway of the upper steel trusses platform height of controlling; When temporary structure construction, measure according to 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 steel truss girder traveling process, at lower edge main truss center and the node of steel truss girder, lay observation point;
When steel truss girder is drawn, before steel truss girder reaches design attitude, to measure in time physical location and the theoretical position deviation of beam body, then in time beam body is rectified a deviation, also to arrange falsework to carry out the monitoring of stressed rear distortion simultaneously, according to the timely feedback information of observed result, take appropriate measures, guarantee the distortion of dilatory process medium-height trestle and beam body and stablize all at controlled area charactert.
After dilatory putting in place, the beam process that falls will be laid control point at beam body, and the monitoring each fulcrum falling speed of beam process central sill body that falls is synchronous, avoids occurring beam body distortion stressing conditions.
Adopt the present invention of technique scheme compared with prior art, can ensure that the precision of temporary rest pier is to both wired safety was guaranteed, and construction technology is simple, applied widely, simple to operation.
Preferred version of the present invention is:
In described step a, at least three of the settings of reference point; In the time that observation condition is good or observation project is few, on reference point, directly measure deformation observation point; Deformation observation point arranges in pier construction and falsework work progress, is used for monitoring the stability of falsework.
In described step b, utilize both main positions, on-the-spot railway related facility and topography and geomorphology data of wired side slope, curb of method collection of total powerstation digitized mapping, GPSRTK digitized mapping method or transit subtense technique, be depicted as digital topography map, for construction control provides computer simulation basic data, and for Optimizing Construction Scheme with improve row construction method spatial data is provided.
In described step b, utilize both main positions, on-the-spot railway related facility and topography and geomorphology data of wired side slope, curb of method collection of total powerstation digitized mapping, GPSRTK digitized mapping method or transit subtense technique, be depicted as digital topography map.
In described step a, in the time that observation condition is poor or observation project is many, 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, before construction, encrypts bench mark according to fourth class levelling network.
After described vertical control network completes, layout by the order of bench mark, reference point, working base point and deformation observation point successively, then utilize working base point to survey deformation observation point height.
Described track plan control screen cloth net precision and requirement meet " railroad survey specification ", select the plane control network level corresponding with construction bridges to lay.
Brief description of the drawings
Fig. 1 is job site image data figure.
Fig. 2 is the schematic diagram that in embodiment, order is layouted.
Fig. 3 is the schematic diagram of deformation observation point position.
Fig. 4 is the control measurement schematic diagram in dilatory process.
Detailed description of the invention
Below in conjunction with embodiment in detail the present invention is described in detail:
A high-accuracy control method for the large-scale temporary steel structure of steel truss girder slideway platform construction, carries 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 specification ", 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 plane adopts GPS or total powerstation to measure controlling net, and elevation adopts optics or the sub-level gauge of number that can meet construction control network precision to measure; After vertical control network completes, carry out the laying of vertical control network across part for bridge steel structure hole, reference point and deformation observation point are set; At least three of the settings of reference point; In the time that observation condition is good or observation project is few, on reference point, directly measure deformation observation point; Deformation observation point arranges in pier construction and falsework work progress, is used for monitoring the stability of falsework.
After vertical control network completes, successively according to the order of bench mark, reference point, working base point and deformation observation point, then utilize working base point to survey deformation observation point height.
Vertical control network design cross-post is fourth class levelling network, before construction, encrypts bench mark according to fourth class levelling network.The technical requirements of fourth class levelling network is as shown in the table:
In the time that observation condition is poor or observation project is many, working base point is set, working base point is selected in stable position, for example on 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:
Both main positions, on-the-spot related facility and topography and geomorphology data of wired side slope, curb etc. of method collection of utilizing total powerstation digitized mapping, GPS RTK digitized mapping method or transit subtense technique, are depicted as digital topography map.
According to topographic map, in advance pier location and temporory structure position are simulated to unwrapping wire on figure; After 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 check controlling net and bench mark, ensure 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 ", control measurement setting-out and the template detection of links; After pier shaft completes, in 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 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 completes, bench mark need to be caused on the cap of top, and carry out by pier translocation, height measurement adopts long steel ruler to be measured as master in conjunction with level gauge, and carry out triangulated height with 1 second precision total powerstation and check, after Bridge Pier Construction completes, bench mark is caused to Dun Ding, the convenient large-scale temporary structure slideway of the upper steel trusses platform height of controlling; When temporary structure construction, measure according to 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 in the sedimentation of temporary structure thing and displacement survey and steel truss girder traveling process, level and vertically off normal monitoring, most important to arranging a dilatory process.Steel truss girder is assembled to be completed after passed examination, lays observation point in the position such as lower edge main truss center and node of steel truss girder; Layout position to be convenient to observation and can in work progress, not destroy.
Before dilatory, according to dilatory plan node, calculate theoretical coordinate and the elevation of the in-position, monitoring point of beam body.
When steel truss girder is drawn, before steel truss girder reaches design attitude, to measure in time physical location and the theoretical position deviation of beam body, then in time beam body is rectified a deviation, also will arrange falsework to carry out the monitoring of stressed rear distortion simultaneously, according to calculated description result, in stressed least favorable situation, monitoring point is set, according to the timely feedback information of monitoring result, take measures, guarantee drew the distortion of engineering support (support is a part for temporary steel structure) and beam body and stablized all at controlled area charactert; In dilatory process, monitoring position is anticipated as shown in Figure 4.A, B point is steel truss girder beam-ends central point, and coordinate shown in A, B point is Measured Coordinates in dilatory process; C, 2 of D are respectively bridge pier centerline 111 and No. 112, shown in coordinate be 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 time, illustrate that steel truss girder beam body position is offset, and need to proofread and correct.After dilatory putting in place, the beam process that falls will be laid control point at beam body, and the monitoring each fulcrum falling speed of beam process central sill body that falls is synchronous, avoids occurring beam body distortion stressing conditions.
Claims (8)
1. a high-accuracy control method for the large-scale temporary steel structure of steel truss girder slideway platform construction, carries 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 plane adopts GPS or total powerstation to measure controlling net, and elevation adopts optics or the digital level that can meet construction control network precision to measure; After vertical control network completes, carry out the laying of vertical control network across part for bridge steel structure hole, reference point and deformation observation point are set;
B, construction process control:
According to topographic map, in advance pier location and temporory structure position are simulated to unwrapping wire on figure; After making a record construct influential pipeline and works, carry out on-the-spot physical location setting-out;
C, pier body construction stage:
Regularly check controlling net and bench mark, ensure the accuracy of measuring; Control measurement setting-out and the template detection of links; After pier shaft completes, in pier shaft both sides, observation mark is set, requires to carry out settlement observation according to second-order levelling; After 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 completes, bench mark need to be caused on the cap of top, and carry out by pier translocation, height measurement adopts long steel ruler to be measured as master in conjunction with level gauge, and carry out triangulated height with 1 second precision total powerstation and check, after Bridge Pier Construction completes, bench mark is caused to Dun Ding, the convenient large-scale temporary structure slideway of the upper steel trusses platform height of controlling; When temporary structure construction, measure according to 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 steel truss girder traveling process, at lower edge main truss center and the node of steel truss girder, lay observation point;
When steel truss girder is drawn, in the time that steel truss girder reaches design attitude, to measure in time physical location and the theoretical position deviation of beam body, then in time beam body is rectified a deviation, also to arrange falsework to carry out the monitoring of stressed rear distortion simultaneously, guarantee drew the distortion of engineering support and beam body and stablized all at controlled area charactert;
After dilatory putting in place, the beam process that falls will be laid control point at beam body, and the monitoring each fulcrum falling speed of beam process central sill body that falls is synchronous, avoids occurring 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: in described step a, and at least three of the settings of reference point; In the time that observation condition is good or observation project is few, on reference point, directly measure deformation observation 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: in described step b, both main positions, on-the-spot railway related facility and topography and geomorphology data of wired side slope, curb of method collection of utilizing total powerstation digitized mapping, GPSRTK digitized mapping method or transit subtense technique, 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: in described step a, in the time that observation condition is poor or observation project is many, 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: in described step b, 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: the design cross-post of vertical control network is fourth class levelling network, before construction, encrypts bench mark according to fourth class levelling network.
7. the high-accuracy control method of the large-scale temporary steel structure of steel truss girder according to claim 4 slideway platform construction, it is characterized in that: after described vertical control network completes, layout by the order of bench mark, reference point, working base point and deformation observation point successively, then utilize working base point to survey 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 specification ", select the plane control network level corresponding with construction bridges to lay.
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| 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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| CN101509232B (en) * | 2009-03-20 | 2010-09-15 | 中铁大桥局股份有限公司 | Three-joist trussed steel beam linear control method |
| CN101906755B (en) * | 2010-09-06 | 2012-07-04 | 中铁大桥局集团有限公司 | Three-truss continuous steel truss girder pushing device and arrangement method thereof |
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