CN112900265B - Continuous steel beam installation line shape control method - Google Patents
Continuous steel beam installation line shape control method Download PDFInfo
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- CN112900265B CN112900265B CN202110017956.2A CN202110017956A CN112900265B CN 112900265 B CN112900265 B CN 112900265B CN 202110017956 A CN202110017956 A CN 202110017956A CN 112900265 B CN112900265 B CN 112900265B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/002—Measuring arrangements characterised by the use of optical techniques for measuring two or more coordinates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention relates to the technical field of engineering construction assistance, in particular to a method for controlling the installation line shape of a continuous steel beam, which comprises the following steps: erecting a first segment of a first main pier, respectively arranging an observation pier G1 and a T1 at the upper chord and the lower chord of the first main pier, arranging four control points corresponding to G1 at the upper layer of a tower column of the first main pier and four control points corresponding to T1 at the lower layer of the tower column of the first main pier, and determining the coordinates of all the control points; erecting the first segment of the second main pier, G2 and T2 and control points in the same way as the first main pier, and determining coordinates; when each steel beam segment is assembled subsequently, after the coordinates of G1, T1, G2 and T2 are determined through the control points, the lower chord line shape control is carried out by the T1 and the T2 which are a measuring point and a rear view point, and the upper chord line shape control is carried out by the G1 and the G2 which are a measuring point and a rear view point. The problem of inaccurate measurement of the installation line shape of the continuous steel beam caused by non-uniform measurement reference and large height difference of the upper chord and the lower chord in the prior art can be solved.
Description
Technical Field
The invention relates to the technical field of engineering construction assistance, in particular to a method for controlling the installation line shape of a continuous steel beam.
Background
The bridge span of domestic highway-railway dual-purpose bridges or double-layer highway bridges is increasingly large, and when a suspension bridge or a cable-stayed bridge is adopted as a bridge type, the upper structure is usually designed into a multi-span continuous steel truss beam, a box-truss combination beam and other structural forms. In the assembling stage of the steel beam cantilever, the coordination of the central line of the steel beam and the central line of the line is ensured, the accuracy of the relative relation among all sections of the steel beam is ensured, and the smooth closure of the steel beam erection is realized. In order to improve the measurement precision of the steel beam linear monitoring data and increase the comparability of the monitoring data of each section, the arrangement of the control points for linear measurement is particularly important.
At present, in the process of assembling a cantilever of a steel beam in China, a method for setting a station for direct observation of a linear measurement control point by using a shoreside control point, a method for setting a station for backward intersection on the steel beam by using a total station and the like are mostly adopted.
A method for setting stations and directly observing by using a shoreside control point is characterized in that a total station is erected by selecting a control point of a main bridge construction control net close to a main pier, and a steel beam monitoring point prism is directly observed by looking back at other control points or opposite control points of the shoreside. When the steel beam is erected for a certain length, because the relative positions of the top surface of the lower chord and the top surface of the upper chord of the steel beam are higher and the beam surface is wider, the monitoring point cannot be directly observed, and the set point needs to be measured to the top surface of the lower chord or the upper chord of the steel beam again for observation. The disadvantages of this method are: firstly, because the main pier of a cable-stayed bridge or a suspension bridge is usually far away from the shore, the measurement precision of the total station polar coordinate method is greatly influenced by the external environment and cannot be ensured; secondly, although the main bridge control network is regularly retested, two main piers are observed by adopting two bank control points, and the defects of non-uniform measurement reference and poor comparability of monitoring data still exist.
A method for setting a station on a steel beam by a total station through back intersection includes the steps of selecting points on the upper chord surface or the lower chord surface of an assembled steel beam, setting the stations in communication with at least 3 control points on the shore, obtaining coordinates of the set stations through the back intersection method, and then carrying out steel beam linear monitoring data acquisition and steel beam linear control. The disadvantages of this method are: firstly, in order to ensure that at least 3 control points are in communication with the bank, a station is required to be arranged at the foremost end of a cantilever section of a steel beam, the steel beam is greatly influenced by external load and construction, the whole structure is unstable, and the precision of a measurement result is directly influenced; secondly, the selection of points and the installation of stations are relatively difficult at the cantilever end of the steel beam between the two main piers. And thirdly, different main bridge control points are adopted for station setting, the existing measurement datum is not uniform, and the comparability of monitoring data is poor. Fourthly, due to the fact that the height difference between the upper chord surface and the lower chord surface of the steel beam and the main bridge construction control net is large, the influence of base line length deformation caused by the height projection surfaces of the steel beam and the main bridge on the rear intersection measurement result is large, and the like.
In summary, in the existing method for measuring the installation alignment of the continuous steel beam, because the main pier of the bridge is usually far away from the bank, when the total station polar coordinate method is adopted to control the alignment of the steel beam, the measurement accuracy is easily influenced by the external environment; although the main bridge control network is regularly retested, when two main piers are observed by adopting control points on two banks of the bridge respectively and the line shape of a steel beam is controlled, the phenomena that the measurement reference is not uniform and the comparability of monitoring data is poor still exist; and the height difference between the upper and lower chords of the steel beam and the main bridge construction control net is large, and the influence of the length deformation of the base line caused by the projection surface between the upper and lower chords of the steel beam and the main bridge on the achievement of the rear intersection method is large.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for controlling the installation linearity of a continuous steel beam, which can solve the problem of inaccurate measurement of the installation linearity of the continuous steel beam caused by non-uniform measurement reference and large height difference between an upper chord and a lower chord in the prior art.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows:
the invention provides a method for controlling the installation line shape of a continuous steel beam, which comprises the following steps:
erecting a first segment of a first main pier, respectively arranging an observation pier G1 and a T1 at the upper chord and the lower chord of the first main pier, determining coordinates of G1 and T1, arranging four control points corresponding to G1 at the upper layer of a tower column of the first main pier and four control points corresponding to T1 at the lower layer of the tower column of the first main pier, and determining coordinates of all control points on the tower column of the first main pier;
erecting a first segment of a second main pier, laying observation piers G2 and T2 and corresponding control points in the same way as the first main pier, and determining coordinates of all the control points on a tower column of the second main pier;
when each steel beam segment is assembled subsequently, after the coordinates of G1, T1, G2 and T2 are determined through four control points corresponding to G1, T1, G2 and T2, linear measurement control of a lower chord plane of the steel beam is performed by using T1 and T2 as a surveying point and a rear viewpoint, and linear measurement control of an upper chord plane of the steel beam is performed by using G1 and G2 as a surveying point and a rear viewpoint.
In some alternative embodiments, said erecting the first main pier first segment comprises the steps of:
establishing an axis coordinate system of steel truss girder installation linear control by taking pier top central points of all main piers and auxiliary piers as a reference;
and taking the central point of the first main pier as a rear view point, arranging a total station at the central point of the adjacent auxiliary pier, and adjusting the central axis and the elevation of the first segment of the first main pier to a design position to complete erection of the first segment of the first main pier.
In alternative embodiments, the pier top center points of all main piers and auxiliary piers are determined by through measurements.
In some optional embodiments, each observation pier comprises a bracket connected with the steel beam section and a forced centering observation disc arranged on the bracket, and the total station is arranged on the forced centering observation disc.
In some alternative embodiments, the determining the coordinates of G1 and T1 includes: and taking the central point of the first main pier as a rear view point, arranging a total station at the central point of the adjacent auxiliary pier, and determining the coordinates of G1 and T1 in an axis coordinate system of the linear control of the installation of the steel truss girder.
In some alternative embodiments, the laying of four control points corresponding to G1 and T1 on the upper and lower layers of the tower column of the first main pier specifically includes:
four prisms corresponding to G1 and T1 for through vision are distributed on the upper and lower tower columns, the large and small mileage sides and the two layers of the upper chord surface and the lower chord surface of the first main pier.
In some alternative embodiments, the four prisms of each layer are located on the same elevation plane as the viewing pier on the upper chord plane or the lower chord plane, and the prisms are fixed on the tower of the first main pier.
In some alternative embodiments, said determining the coordinates of all the control points on the tower of the first main pier comprises:
taking the center of the auxiliary pier as a rear viewpoint, arranging a total station on an observation pier G1, and determining four control points corresponding to G1 arranged on the upper layer of a tower column of the first main pier;
and taking the center of the auxiliary pier as a rear viewpoint, arranging a total station on the observation pier G2, and determining four control points corresponding to G2 arranged on the upper layer of the tower column of the first main pier.
In some alternative embodiments, the determining the coordinates of G1, T1, G2 and T2 through the four control points corresponding to G1, T1, G2 and T2 includes:
determining coordinates of G1 through four control points corresponding to G1 arranged on the upper layer of the tower column of the first main pier;
determining coordinates of T1 through four control points corresponding to T1 arranged on the lower layer of the tower column of the first main pier;
determining coordinates of G2 through four control points corresponding to G2 arranged on the lower layer of the tower column of the second main pier;
the coordinates of T2 are determined by the four control points corresponding to T2 provided on the lower column level of the second main pier.
In some optional embodiments, the T1 and T2 perform linear measurement control of a lower chord plane of the steel beam and the G1 and G2 perform linear measurement control of an upper chord plane of the steel beam for each other at the survey station and the rear viewpoint, specifically including:
taking a T1 rear view point and a T2 as a measuring station or taking a T2 rear view point and a T1 as a measuring station to carry out linear measurement control on the lower chord plane of the steel beam;
and (3) carrying out linear measurement control on the chord plane of the steel beam by taking a G1 rear view point and G2 as a measuring station or taking a G2 rear view point and G1 as a measuring station.
Compared with the prior art, the invention has the advantages that: an observation pier is respectively arranged at the upper chord and the lower chord of the first section of the two main towers, and coordinates are determined. And then control points are arranged on the upstream and downstream tower columns, and the coordinates of each control point are determined by arranging stations on observation piers arranged at the upper chord and the lower chord. The control points of the upstream and downstream tower columns buried in the cable-stayed bridge or the suspension bridge are taken as the reference, and the coordinates of the observation pier are determined by adopting a rear intersection method during each linear measurement, so that the measurement operation speed is high, and the measurement precision is high; the observation piers of the two main piers are used as a survey station and a rear viewpoint for controlling the linear measurement of the steel beam, so that the consistency of the calculation points of the monitoring data is ensured, and the comparability of the data is increased. The consistency of data starting points of the steel beam upper and lower chord observation piers is ensured, and the reliability of measuring the verticality of the steel beam vertical rod is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a control method for continuous steel beam installation line shape according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of establishing an axis coordinate system according to an embodiment of the present invention;
FIG. 3 is a schematic view of the erection of the first segment of the first main pier in an embodiment of the invention;
FIG. 4 is a schematic illustration of the placement of control points on a first main pier column in an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the determination of coordinates of control points according to an embodiment of the present invention;
fig. 6 is a schematic diagram of step S3 in the embodiment of the present invention.
In the figure: 11. a first main pier; 12. a second main pier; 2. auxiliary piers; 3. side piers; 41. a first main pier segment; 42. a first segment of a second main pier; 5. a total station; 6. and a prism.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a method for controlling the installation line shape of a continuous steel beam, comprising the following steps:
s1: erecting a first segment 41 of the first main pier, respectively arranging an observation pier G1 and a T1 at the upper chord and the lower chord of the first main pier, determining coordinates of G1 and T1, arranging four control points corresponding to G1 at the upper layer of the tower column of the first main pier 11 and four control points corresponding to T1 at the lower layer of the tower column of the first main pier 11, and determining coordinates of all the control points on the tower column of the first main pier 11.
As shown in fig. 2, in some alternative embodiments, erecting the first main pier first segment 41 comprises the steps of:
the pier top center points of all main piers and auxiliary piers 2 are determined by through-going measurements.
And establishing an axis coordinate system for linear control of the installation of the steel truss girder by taking the pier top central points of all the main piers and the auxiliary piers 2 as a reference.
In the embodiment, the steel truss girder installation linear control system further comprises side piers 3, and after pier top central points of all the side piers 3, the main piers and the auxiliary piers 2 are determined through measurement, an axis coordinate system of steel truss girder installation linear control is established by taking the pier top central points of all the side piers 3, the main piers and the auxiliary piers 2 as a reference.
As shown in fig. 3, the total station 5 is arranged at the central point of the adjacent auxiliary pier 2 with the central point of the first main pier 11 as the rear viewpoint, and the central axis and the elevation of the first segment 41 of the first main pier are adjusted to the designed position, so as to complete erection of the first segment 41 of the first main pier.
In this embodiment, the total station 5 is erected at the center point of the auxiliary pier 2, the center point of the main pier is viewed from the rear, coordinates of a rear viewpoint (center point of the main pier) are measured, coordinates of a station (auxiliary pier) are corrected according to a coordinate difference, and the total station 5 is set up until the coordinates of the rear viewpoint are consistent with a through measurement result. Of course in other embodiments the coordinate system can be established in other ways, as well as the first segment of the first main pier 11.
In some optional embodiments, determining the coordinates of G1 and T1 specifically includes: and taking the central point of the first main pier 11 as a rear view point, arranging a total station 5 at the central point of the adjacent auxiliary pier 2, and determining the coordinates of G1 and T1 in an axis coordinate system of the steel truss girder installation linear control.
Each observation pier comprises a support connected with the steel beam section and a forced centering observation disc arranged on the support, and the total station 5 is arranged on the forced centering observation disc.
As shown in fig. 4, in some alternative embodiments, four control points corresponding to G1 and T1 are respectively arranged at the upper layer and the lower layer of the tower column of the first main pier 11, specifically including:
four visual prisms 6 corresponding to G1 are arranged on the upper chord plane of the first main pier on the upper and lower tower columns and the large and small mileage sides as control points.
Four visual prisms 6 corresponding to T1 are arranged on the upstream and downstream tower columns and the large and small mileage sides of the lower chord surface of the first main pier as control points.
In this embodiment, the four prisms 6 of each layer are located on the same elevation plane as the observation pier on the upper chord plane or the lower chord plane, and the prisms 6 are fixed on the tower of the first main pier 11.
As shown in fig. 5, in some alternative embodiments, determining the coordinates of all control points on the tower of the first main pier 11 comprises:
and taking the center of the auxiliary pier as a rear viewpoint, arranging a total station 5 on the observation pier G1, and determining four control points corresponding to G1 arranged on the upper layer of the tower column of the first main pier 11.
And taking the center of the auxiliary pier as a rear viewpoint, arranging a total station 5 on the observation pier G2, and determining four control points corresponding to G2 arranged on the upper layer of the tower column of the first main pier 11.
In other embodiments, the side pier 3 may be set up as a rear view point.
S2: the second main pier leading segment 42 is erected, the observation piers G2 and T2 and the corresponding control points are laid out in the same way as the first main pier 11, and the coordinates of all the control points on the tower of the second main pier are determined.
As shown in fig. 6, S3: when each steel beam segment is assembled subsequently, after the coordinates of G1, T1, G2 and T2 are determined through four control points corresponding to G1, T1, G2 and T2, linear measurement control of a lower chord plane of the steel beam is performed by using T1 and T2 as a surveying point and a rear viewpoint, and linear measurement control of an upper chord plane of the steel beam is performed by using G1 and G2 as a surveying point and a rear viewpoint.
In some embodiments, the coordinates of G1, T1, G2, and T2 are determined by four control points corresponding to G1, T1, G2, and T2, including:
determining coordinates of G1 through four control points corresponding to G1 arranged on the upper layer of the tower column of the first main pier 11; determining coordinates of T1 through four control points corresponding to T1 arranged on the lower layer of the tower column of the first main pier 11; determining coordinates of G2 through four control points corresponding to G2 arranged on the lower layer of the tower column of the second main pier 12; the coordinates of T2 are determined by the four control points corresponding to T2 provided on the lower column of the second main pier 12.
In the embodiment, the coordinates of the corresponding observation pier are obtained by four control points by adopting a rear intersection method.
When the coordinates of the observation pier on the steel beam are measured and the coordinates of the prism 6 on the tower column are measured by adopting the observation pier station, the steel beam and the main pier are selected to be temporarily solidified, and the process is finished when the natural environment and the construction environment are in a relatively stable time period. During observation, a total station forward-backward mirror method and a multi-echo method are adopted for observation.
In some optional embodiments, the performing, by the T1 and the T2, linear measurement control on the lower chord plane of the steel beam and the performing, by the G1 and the G2, linear measurement control on the upper chord plane of the steel beam by the surveying station and the rear viewpoint each other specifically includes: carrying out linear measurement control on the lower chord plane of the steel beam by taking a T1 rear view point and a T2 as a measuring station or taking a T2 rear view point and a T1 as measuring stations; and (3) carrying out linear measurement control on the chord plane of the steel beam by taking a G1 rear view point and G2 as a measuring station or taking a G2 rear view point and G1 as a measuring station.
In conclusion, the method adopts the center point of the top of the pier in the range of the continuous steel truss girder determined by through measurement as a reference to establish a linear measurement control axis coordinate system for the installation of the continuous steel truss girder; the total station 5 is erected at the center point of the auxiliary pier, a station is arranged according to the center point of the main pier, and the central axis and the elevation of the first section of the steel beam at the top of the main pier are adjusted to the design position; near the top nodes of the steel beam piers, a survey station observation pier G1 and a survey station observation pier T1 are respectively arranged at the upper chord and the lower chord; respectively arranging a single prism on the upstream and downstream pylons and the large and small mileage sides of a cable-stayed bridge or a suspension bridge, arranging the single prism on an upper chord surface layer and a lower chord surface layer, wherein the total number of the prisms is 8, and 4 prisms 6 on each layer are respectively in communication with observation piers G1 and T1 of a survey station; selecting reasonable construction working conditions and natural environments, and measuring coordinate values of G1 and T1 in a continuous steel truss girder installation linear measurement control axis coordinate system; erecting a total station 5 on observation piers G1 and T1 respectively, and obtaining plane coordinates of 4 prisms 6 of an upstream tower column and a downstream tower column by adopting a plurality of survey; in the same method, observation piers G2 and T2 are arranged on the first section steel beam of the other main pier; when the subsequent steel beam is assembled, the total station 5 is erected on a survey station observation pier T1(T2), coordinates of the survey station are obtained by adopting a rear intersection method, the survey station observation piers T1 and T2 mutually measure the station and the rear viewpoint to perform linear measurement control on the lower chord plane of the steel beam, and the same method G1 and G2 mutually measure the rear viewpoint to perform linear measurement control on the upper chord plane of the steel beam.
The steel beam line shape monitoring control points are established on the basis of pier through measurement, so that the consistency of a steel beam assembling central line and a line central line is ensured, the length change of a base line caused by different projection surfaces is eliminated, and the steel beam span actually measured by the total station 5 is ensured to be equal to the design span; the upstream and downstream tower column prisms 6 buried in a cable-stayed bridge or a suspension bridge are taken as a reference, and the coordinates of an observation pier are determined by adopting a rear intersection method during each linear measurement, so that the measurement operation speed is high, and the measurement precision is high; the observation piers of the two main piers are used as a survey station and a rear viewpoint for controlling the linear measurement of the steel beam, so that the consistency of the calculation points of the monitoring data is ensured, and the comparability of the data is increased. The consistency of the data starting points of the upper and lower chord observation piers of the steel beam is ensured, and the verticality measurement reliability of the vertical rod of the steel beam is improved.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for controlling the installation line shape of a continuous steel beam is characterized by comprising the following steps:
erecting a first segment of a first main pier, respectively arranging an observation pier G1 and a T1 at the upper chord and the lower chord of the first main pier, determining coordinates of G1 and T1, arranging four control points corresponding to G1 at the upper layer of a tower column of the first main pier and four control points corresponding to T1 at the lower layer of the tower column of the first main pier, and determining coordinates of all control points on the tower column of the first main pier;
erecting a first segment of a second main pier, laying observation piers G2 and T2 and corresponding control points in the same way as the first main pier, and determining coordinates of all the control points on a tower column of the second main pier;
when each steel beam segment is assembled subsequently, after the coordinates of G1, T1, G2 and T2 are determined through four control points corresponding to G1, T1, G2 and T2, linear measurement control of a lower chord plane of the steel beam is performed by using T1 and T2 as a surveying point and a rear viewpoint, and linear measurement control of an upper chord plane of the steel beam is performed by using G1 and G2 as a surveying point and a rear viewpoint.
2. The method for controlling the installation line shape of the continuous steel beam according to claim 1, wherein: erecting a first segment of a first main pier comprises the following steps:
establishing an axis coordinate system of steel truss girder installation linear control by taking pier top central points of all main piers and auxiliary piers as a reference;
and taking the central point of the first main pier as a rear view point, arranging a total station at the central point of the adjacent auxiliary pier, and adjusting the central axis and the elevation of the first section of the first main pier to the designed position to finish erecting the first section of the first main pier.
3. The line shape control method for continuous steel beam installation according to claim 2, wherein: the pier top center points of all main piers and auxiliary piers are determined by through-going measurements.
4. The continuous steel beam installation line shape control method according to claim 2, wherein: each observation pier comprises a support connected with the steel beam section and a forced centering observation disc arranged on the support, and the total station is arranged on the forced centering observation disc.
5. The method for controlling the installation alignment of the continuous steel beam as claimed in claim 1, wherein the determining coordinates of G1 and T1 comprises: and taking the central point of the first main pier as a rear view point, arranging a total station at the central point of the adjacent auxiliary pier, and determining the coordinates of G1 and T1 in an axis coordinate system of the linear control of the installation of the steel truss girder.
6. The method for controlling the installation alignment of the continuous steel beam according to claim 1, wherein the four control points corresponding to G1 are arranged at the upper layer of the tower column of the first main pier, and the four control points corresponding to T1 are arranged at the lower layer of the tower column of the first main pier, and the method specifically comprises the following steps:
four prisms corresponding to G1 and T1 for through vision are distributed on the upper and lower tower columns, the large and small mileage sides and the two layers of the upper chord surface and the lower chord surface of the first main pier.
7. The line shape control method for continuous steel beam installation according to claim 6, wherein four prisms of each layer are positioned on the same elevation plane with the observation pier on the upper chord plane or the lower chord plane, and the prisms are fixed on the tower column of the first main pier.
8. The continuous steel girder installation alignment control method of claim 1, wherein the determining coordinates of all control points on the tower of the first main pier comprises:
taking the center of the auxiliary pier as a rear viewpoint, arranging a total station on an observation pier G1, and determining four control points corresponding to G1 arranged on the upper layer of a tower column of the first main pier;
and taking the center of the auxiliary pier as a rear viewpoint, arranging a total station on the observation pier G2, and determining four control points corresponding to G2 arranged on the upper layer of the tower column of the first main pier.
9. The method for controlling the installation line shape of the continuous steel beam as claimed in claim 1, wherein the determining coordinates of G1, T1, G2 and T2 through four control points corresponding to G1, T1, G2 and T2 comprises:
determining coordinates of G1 through four control points corresponding to G1 arranged on the upper layer of the tower column of the first main pier;
determining coordinates of T1 through four control points corresponding to T1 arranged on the lower layer of the tower column of the first main pier;
determining coordinates of G2 through four control points corresponding to G2 arranged on the upper layer of the tower column of the second main pier;
the coordinates of T2 are determined by the four control points corresponding to T2 provided on the lower column level of the second main pier.
10. The method of claim 1, wherein the T1 and T2 perform linear measurement of the lower chord plane of the steel beam and the G1 and G2 perform linear measurement of the upper chord plane of the steel beam respectively at the survey station and the rear viewpoint, and the method specifically comprises:
carrying out linear measurement control on the lower chord plane of the steel beam by taking a T1 rear view point and a T2 as a measuring station or taking a T2 rear view point and a T1 as measuring stations;
and (3) carrying out linear measurement control on the chord plane of the steel beam by taking a G1 rear view point and G2 as a measuring station or taking a G2 rear view point and G1 as a measuring station.
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