CN108625296B - Installation linear control method for segmental precast bridge - Google Patents
Installation linear control method for segmental precast bridge Download PDFInfo
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- CN108625296B CN108625296B CN201810673199.2A CN201810673199A CN108625296B CN 108625296 B CN108625296 B CN 108625296B CN 201810673199 A CN201810673199 A CN 201810673199A CN 108625296 B CN108625296 B CN 108625296B
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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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Abstract
The invention relates to a method for controlling the installation line shape of a segmental precast bridge, which comprises the steps of installing measuring points after the prefabrication of a segmental beam is finished, measuring the coordinates of the measuring points in a factory coordinate system, and calculating to obtain the coordinates of the measuring points of the segmental beam in an installation coordinate system through coordinate conversion; after the first segment beam is installed, checking the coordinates of the measured points and the calculated coordinates, ensuring that the error is less than or equal to +/-2 mm, and temporarily fixing the first segment beam and the pier top block; after the three-segment beam is installed according to the existing line shape, coordinate inspection is carried out, the installation coordinate of the third segment beam is measured and compared with the coordinate of a measuring point for calculating the third segment beam, if the error of the third segment beam is +/-2 mm, the temporary fixation of the first segment beam is removed, the integral rotation of the three segment beams is realized, and the error of the third segment beam is less than or equal to +/-2 mm, the first segment beam is fixed again. The method can effectively reduce the use frequency of the gasket, control the construction quality of the joint and improve the durability of the joint.
Description
Technical Field
The invention relates to a bridge construction method, in particular to a linear control method for mounting a segmental precast bridge.
Background
Because the measurement error in the positioning of the reference block cannot be completely eliminated, if a large spatial position deviation still exists after the positioning adjustment is carried out, the subsequent beam section installation linear deviation can be continuously amplified. The traditional method for controlling the linear shape of the beam section is to add a gasket at a joint for offset adjustment after one beam is completely built, and then assemble the next beam after the requirement is met. However, this method involves the problem of the number of gaskets used, which affects not only the quality and durability of the joint but also the efficiency of the construction.
Disclosure of Invention
The invention aims to control the installation linear offset of a segmental precast beam, and provides an installation linear control method for a segmental precast bridge.
Because the measurement error can not be completely eliminated when the section beam is positioned, and a large space position deviation still exists after the positioning, in order to avoid continuous amplification of the subsequent beam section installation line shape deviation, the three-piece beam integral rotation adjusting method in the installation stage is provided to optimize the line shape of the reference block, and the beam section line shape is controlled by the three-piece integral rotation adjusting method.
The purpose of the invention can be realized by the following technical scheme:
a method for controlling the installation line shape of a segmental precast bridge comprises the following steps:
after the segment beam is prefabricated, mounting measuring points, measuring coordinates of the measuring points under a factory coordinate system, and calculating to obtain measuring point coordinates of the segment beam under a mounting coordinate system through coordinate conversion;
after the first segment beam is installed, checking the coordinates of the measured points and the calculated coordinates, ensuring that the error is less than or equal to +/-2 mm, and temporarily fixing the first segment beam and the pier top block;
after the three section beams are installed according to the existing line shape, coordinate inspection is carried out, the installation coordinate of the third section beam is measured and compared with the coordinate of a measuring point for calculating the third section beam, if the error of the third section beam is +/-2 mm, the temporary fixation of the first section beam is removed, the end face of the first section beam is jacked by a small jack to realize the integral rotation of the three section beams, and the error of the third section beam is less than or equal to +/-2 mm, and the first section beam is fixed again. And adjusting the overlarge error based on the error amplification effect, wherein the coordinate error of the first plate beam necessarily meets the requirement at the moment.
After the first section beam is installed to meet the requirement, temporarily fixing the first section beam and the pier top block, continuously installing a second section beam, and fixedly bonding the second section beam and the first section beam; and then, installing a third segmental beam, bonding and fixing the third segmental beam and the second segmental beam, and installing and locking the segmental beams after the coordinate adjustment meets the requirement.
After the segment beam is prefabricated, the method for installing the measuring points comprises the following steps: the method comprises the following steps of arranging 6 conventional measuring points, arranging two newly-added measuring points at the transverse position of a segmental beam, arranging the 6 conventional measuring points in the middle of two sides of the segmental beam in a symmetrical structure, arranging three conventional measuring points on each side of the segmental beam, arranging the three conventional measuring points on the same straight line, arranging the two newly-added measuring points on one side of the segmental beam, and arranging the three conventional measuring points on the same side of the segmental beam on the same straight line.
Two newly-increased points are arranged close to the side ends of the length direction of the section beam, and the specific arrangement principle of the newly-increased points is as follows: the distance between the newly added measuring point and the nearest side end of the width direction of the segmental beam, namely the longitudinal bridge direction distance is more than or equal to 0.05m and less than or equal to Dz and less than or equal to 0.10 m; the distance between the newly added measuring point and the nearest side end of the length direction of the segmental beam, namely the transverse bridge direction distance is more than or equal to 0.05m and less than or equal to Dh and less than or equal to 0.10 m.
When the segmental beam is positioned, a local coordinate system is established, and the arrangement principle in the local coordinate system is as follows:
an X axis: is vertical to the central connecting line of the two piers,
y-axis: is parallel to the central connecting line of the two piers,
origin: the erection segment beam datum block is closest to the center line of the pier.
According to the method, after the reference block of the sectional beam is positioned, because the measurement error cannot be completely eliminated, after the first sectional beam is erected, if the error meets the requirement, deviation adjustment is not performed temporarily, three sectional beams are continuously installed according to the existing line shape, on the basis of the error linear amplification principle, the corner error of the first sectional beam is obviously amplified on the third sectional beam, and the coordinates of the third sectional beam are rotationally adjusted by utilizing the three sectional beams in an integral method to control the coordinates of the first two sectional beams to be within a reasonable range.
The adjustment of the segmental beam is based on an error amplification effect, and the deviation of a smaller error is controlled by adjusting an overlarge error.
The adjusting method during installation of the segmental beam adopts three pieces of integral rotation adjustment, so that the use frequency of the gasket can be effectively reduced, and the construction quality and the durability of the joint can be ensured.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the method ensures that the error is in a smaller range;
2. the three beams are integrally adjusted in a rotating mode, and work efficiency is improved.
3. The number of used gaskets is reduced, and the construction quality and durability of the joint are controlled. .
Drawings
FIG. 1 is a schematic view of a beam section line shape deviation plane;
FIG. 2 is a schematic view of linear longitudinal deviation of a beam segment;
FIG. 3 is a schematic view of adjustment of linear deviation of a beam segment;
FIG. 4 is a schematic view of a segment beam station arrangement.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
Referring to fig. 1, 2 and 3, a method for controlling the installation line shape of a segmental precast bridge comprises the following steps: after the segment beam is prefabricated, mounting measuring points, measuring coordinates of the measuring points under a factory coordinate system, and calculating to obtain measuring point coordinates of the segment beam under a mounting coordinate system through coordinate conversion;
after the first segment beam 3 is installed, the coordinates of the measured points and the calculated coordinates are verified, the error is less than or equal to +/-2 mm, and the first segment beam 3 and the pier top block 1 are temporarily fixed;
continuously installing a second section beam 4, and fixedly bonding the second section beam 4 and the first section beam 3; and then a third segmental beam 5 is installed, the third segmental beam 5 and the second segmental beam 4 are fixedly bonded, after the three segmental beams 3, 4 and 5 are installed according to the existing line shape, coordinate inspection is carried out, the installation coordinate of the third segmental beam 5 is measured and compared with the coordinate of a measuring point for calculating the third segmental beam 5, if the error of the third segmental beam 5 is +/-2 mm, the temporary fixation of the first segmental beam is removed, the small jack 2 is used for jacking the end surface of the first segmental beam 3 to realize the integral rotation of the three segmental beams 3, 4 and 5, and the first segmental beam 3 is fixed again when the error of the third segmental beam 5 is less than or equal to +/-2 mm.
Referring to fig. 4, after the segment beam is prefabricated, the method for installing the measuring points comprises the following steps: the method comprises the steps of arranging 6 conventional measuring points a \ b \ c \ d \ e \ f, arranging two newly-added measuring points g \ h at the transverse position of a segmental beam, arranging the 6 conventional measuring points in the middle of two sides of the segmental beam in a symmetrical structure, arranging three conventional measuring points on each side of the segmental beam, wherein the three conventional measuring points are located on the same straight line, the two newly-added measuring points are located on one side of the segmental beam, and the three conventional measuring points on the same side of the segmental beam are located on the same straight line. Two newly-increased points are arranged close to the side ends of the length direction of the section beam, and the specific arrangement principle of the newly-increased points is as follows: the distance between the newly added measuring point and the nearest side end of the width direction of the segmental beam, namely the longitudinal bridge direction distance is more than or equal to 0.05m and less than or equal to Dz and less than or equal to 0.10 m; the distance between the newly added measuring point and the nearest side end of the length direction of the segmental beam, namely the transverse bridge direction distance is more than or equal to 0.05m and less than or equal to Dh and less than or equal to 0.10 m.
When the segmental beam is positioned, a local coordinate system is established, and the arrangement principle in the local coordinate system is as follows: an X axis: perpendicular to the line connecting the centers of the two piers, Y-axis: parallel to the two pier center line, origin: the erection segment beam datum block is closest to the center line of the pier.
According to the method, after the reference block of the sectional beam is positioned, because the measurement error cannot be completely eliminated, after the first sectional beam is erected, if the error meets the requirement, deviation adjustment is not performed temporarily, three sectional beams are continuously installed according to the existing line shape, on the basis of the error linear amplification principle, the corner error of the first sectional beam is obviously amplified on the third sectional beam, and the coordinates of the third sectional beam are rotationally adjusted by utilizing the three sectional beams in an integral method to control the coordinates of the first two sectional beams to be within a reasonable range. The adjustment of the segmental beam is based on an error amplification effect, and the deviation of a smaller error is controlled by adjusting an overlarge error. The adjusting method during installation of the segmental beam adopts three pieces of integral rotation adjustment, so that the use frequency of the gasket can be effectively reduced, and the construction quality and the durability of the joint can be ensured.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (6)
1. The installation linear control method for the segmental precast bridge is characterized by comprising the following steps of:
after the segment beam is prefabricated, mounting measuring points, measuring coordinates of the measuring points under a factory coordinate system, and calculating to obtain measuring point coordinates of the segment beam under a mounting coordinate system through coordinate conversion;
after the first segment beam is installed, checking the coordinates of the measured points and the calculated coordinates, ensuring that the error is less than or equal to +/-2 mm, and temporarily fixing the first segment beam and the pier top block;
after the three-segment beam is installed according to the existing line shape, coordinate inspection is carried out, the installation coordinate of the third segment beam is measured and compared with the coordinate of a measuring point for calculating the third segment beam, if the error of the third segment beam is +/-2 mm, the temporary fixation of the first segment beam is removed, the integral rotation of the three segment beams is realized, and if the error of the third segment beam is less than or equal to +/-2 mm, the first segment beam is fixed again.
2. The installation line shape control method for the segmental precast bridge, according to claim 1, is characterized in that after the first segmental beam is installed to meet the requirement, the first segmental beam and the pier top block are temporarily fixed, the second segmental beam is continuously installed, and the second segmental beam and the first segmental beam are fixedly bonded; and then, installing a third segmental beam, bonding and fixing the third segmental beam and the second segmental beam, and installing and locking the segmental beams after the coordinate adjustment meets the requirement.
3. The method for controlling the installation line shape of the segmental precast bridge according to claim 1, wherein after the segmental beam prefabrication is completed, a method for installing a measuring point comprises the following steps:
the method comprises the following steps of arranging 6 conventional measuring points, arranging two newly-added measuring points at the transverse position of a segmental beam, arranging the 6 conventional measuring points in the middle of two sides of the segmental beam in a symmetrical structure, arranging three conventional measuring points on each side of the segmental beam, arranging the three conventional measuring points on the same straight line, arranging the two newly-added measuring points on one side of the segmental beam, and arranging the three conventional measuring points on the same side of the segmental beam on the same straight line.
4. The method for controlling the installation line shape of the segmental precast bridge according to claim 3, wherein two newly added measuring points are arranged close to the side end of the segmental beam in the length direction, and the specific arrangement principle of the newly added measuring points is as follows:
the distance between the newly added measuring point and the nearest side end of the width direction of the segmental beam, namely the longitudinal bridge direction distance is more than or equal to 0.05m and less than or equal to Dz and less than or equal to 0.10 m;
the distance between the newly added measuring point and the nearest side end of the length direction of the segmental beam, namely the transverse bridge direction distance is more than or equal to 0.05m and less than or equal to Dh and less than or equal to 0.10 m.
5. The method for controlling the installation linearity of the segmental precast bridge according to claim 1, wherein a local coordinate system is established when positioning the segmental beam, and the arrangement principle in the local coordinate system is as follows:
an X axis: is vertical to the central connecting line of the two piers,
y-axis: is parallel to the central connecting line of the two piers,
origin: the erection segment beam datum block is closest to the center line of the pier.
6. The installation line shape control method for the segmental precast bridge according to claim 1, wherein the integral rotation of the three segmental girders is realized by using a small jack to jack the end surface of the first segmental girder.
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| CN109440648A (en) * | 2018-11-20 | 2019-03-08 | 湖南工业大学 | Double wet seam precast segment bridge assembly LFM signal devices |
| CN110777669A (en) * | 2019-11-15 | 2020-02-11 | 中铁北京工程局集团有限公司 | High-speed rail continuous beam short line matching prefabricated cantilever assembly line shape control method |
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| CN102733311B (en) * | 2012-07-02 | 2015-02-25 | 中铁大桥局集团武汉桥梁科学研究院有限公司 | Line shape control method for short line method segment prefabrication construction |
| CN104748732B (en) * | 2015-03-26 | 2017-05-10 | 广州瀚阳工程咨询有限公司 | Measurement method for segmental precast bridge erection field |
| CN106223201B (en) * | 2016-07-26 | 2018-06-26 | 中南大学 | The method for correcting error of beam section bridge linear monitoring |
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