CN116084287A - Construction process of ultra-high special-shaped cable tower - Google Patents
Construction process of ultra-high special-shaped cable tower Download PDFInfo
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- CN116084287A CN116084287A CN202211740279.8A CN202211740279A CN116084287A CN 116084287 A CN116084287 A CN 116084287A CN 202211740279 A CN202211740279 A CN 202211740279A CN 116084287 A CN116084287 A CN 116084287A
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000010276 construction Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 62
- 239000010959 steel Substances 0.000 claims abstract description 62
- 238000009434 installation Methods 0.000 claims description 14
- 238000005259 measurement Methods 0.000 claims description 13
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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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
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Bridges Or Land Bridges (AREA)
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Abstract
The invention discloses an ultra-high special-shaped cable tower construction process which comprises the following steps of stiff framework positioning and mounting, tower column steel bar mounting and tower body pouring.
Description
Technical Field
The invention relates to the technical field of bridges, in particular to a construction process of an ultra-high special-shaped cable tower.
Background
The cable-stayed bridge is a bridge in which a bridge deck is suspended by stay cables, also called as a diagonal bridge, and is a structural system formed by combining a pressure-bearing tower, a tension cable and a bearing beam body. The hanging rope is characterized in that two ends of the rope are respectively penetrated into rope holes reserved on the beam and the tower and are preliminarily fixed on an anchor plate on the end face of the rope hole.
Modern bridges often adopt cable-stayed bridges with singular shapes to span existing lines and rivers. However, the cable tower has a singular and complex shape, and is easy to deviate in the construction process.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the ultra-high special-shaped cable tower construction process which can detect the cable tower in real time in the construction process of the cable tower so as to effectively avoid deviation or inclination in the construction process of the cable tower.
The invention adopts the following technical scheme:
the ultra-high special-shaped cable tower construction process comprises the following steps,
positioning and mounting the stiffness frameworks, namely embedding steel plates at the positions of each corner point and each axis of the stiffness frameworks which are embedded in the bearing platform in advance, accurately lofting the steel plates by using a total station polar coordinate method after the concrete of the bearing platform reaches the design strength so as to determine positioning points, mounting the stiffness frameworks, aligning the stiffness frameworks with the positioning points, sequentially mounting the rest stiffness frameworks, and aligning each corner point and each axis of the upper and lower stiffness frameworks;
a step of installing tower column steel bars, in which a stiff framework is used as a locating frame, lofting is measured, locating steel bars are installed, then a steel tape is used for installing a vertical main steel bar on the locating steel bars according to a designed position, the vertical main steel bar is measured and lofted, then a steel tape is used for lofting on the vertical main steel bar, a horizontal steel bar and a template are installed, and after the template is installed, fine adjustment is carried out on the horizontal steel bar according to the position of the template;
and a tower body pouring step, namely erecting a high-precision total station at a forced centering control point preset on the opposite main pier, erecting a prism centering rod at each characteristic point of the template, collecting actual measurement plane and elevation data by the total station, calculating the longitudinal and transverse offset of each characteristic point of the template in real time, adjusting in real time, finally accurately adjusting the template to a preset position, pouring concrete, and forming the tower body after the concrete is solidified.
Further, in the step of positioning and installing the stiff frameworks, when each neck framework is installed, the total station is used for measuring the coordinates and the heights of the top corner points of the neck frameworks, adjustment is carried out according to the difference value between the measured coordinates and the preset coordinates, and the neck frameworks are firmly welded with the lower joint neck frameworks after the adjustment is finished.
Further, the method further comprises a steel anchor beam installation step after the tower body pouring step, wherein in the steel anchor beam installation step, a steel anchor beam and a steel bracket support bracket are erected on the poured tower body.
And in the installation step of the steel anchor beam installation step, integrally hoisting the steel anchor beam into position by adopting a large-scale tower crane, carrying out position fine adjustment by using a jack according to measurement and tracking of a high-precision total station, and firmly welding stiffening ribs of bracket wall plates of the steel anchor beam with upright posts of the stiff framework to finish the installation.
And in the step of installing the cable-stayed cableway pipe, the position of the cableway pipe is accurately lofted through measurement, a positioning channel steel is welded to serve as a limit for installing the cableway pipe, then the plane position and the elevation of the cableway pipe are adjusted by using an upper chain block and a lower chain block, the plane position and the elevation of an upper opening and a lower opening of the cableway pipe are consciously and simultaneously reach preset coordinates and elevations, and finally the cable-stayed cableway pipe is welded on the stiff framework.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the prism centering rods are erected on each characteristic point of the template, and the measured plane and elevation data are collected by combining the total station, so that the longitudinal and transverse offset of each characteristic point of the template is calculated in real time, and is adjusted in real time, thereby effectively avoiding the deviation or inclination in the construction process of the cable tower.
Drawings
FIG. 1 is a schematic diagram of a follow-up correction technique for an ultra-high profile rope tower construction process according to the present invention;
Detailed Description
The present invention will be further described with reference to the accompanying drawings and detailed description, wherein it is to be understood that, on the premise of no conflict, the following embodiments or technical features may be arbitrarily combined to form new embodiments.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The invention discloses a construction process of an ultra-high special-shaped cable tower, which comprises the following steps,
positioning and mounting the stiffness frameworks, namely embedding steel plates at the positions of each corner point and each axis of the stiffness frameworks which are embedded in the bearing platform in advance, accurately lofting the steel plates by using a total station polar coordinate method after the concrete of the bearing platform reaches the design strength so as to determine positioning points, mounting the stiffness frameworks, aligning the stiffness frameworks with the positioning points, sequentially mounting the rest stiffness frameworks, and aligning each corner point and each axis of the upper and lower stiffness frameworks;
a step of installing tower column steel bars, in which a stiff framework is used as a locating frame, lofting is measured, locating steel bars are installed, then a steel tape is used for installing a vertical main steel bar on the locating steel bars according to a designed position, the vertical main steel bar is measured and lofted, then a steel tape is used for lofting on the vertical main steel bar, a horizontal steel bar and a template are installed, and after the template is installed, fine adjustment is carried out on the horizontal steel bar according to the position of the template;
and a tower body pouring step, namely erecting a high-precision total station at a forced centering control point preset on the opposite main pier, erecting a prism centering rod at each characteristic point of the template, collecting actual measurement plane and elevation data by the total station, calculating the longitudinal and transverse offset of each characteristic point of the template in real time, adjusting in real time, finally accurately adjusting the template to a preset position, pouring concrete, and forming the tower body after the concrete is solidified.
Specifically, under the influence of natural environment, the cable tower is always in a moving state in the construction process, the accurate positioning difficulty of the template is high, if a conventional measuring means is adopted, the lofting period is prolonged, and even the cable tower has overlarge errors; the movements are relative, the reference frames are different, and the states are different. If the total station is placed at the top of the tower during lofting, the relationship between the total station and each lofting point is fixed and is in a local coordinate system and relatively static, the lofting precision is greatly improved, but the total station moves in a full-bridge coordinate system, and the neutral position of the total station needs to be determined firstly to establish the relationship between the station and the lofting point. Therefore, a fixed reference point is needed, and the position of the total station is determined at any time, so that all-weather lofting can be realized. In order to conveniently determine the position of a fixed reference point, a measuring prism is adopted for determining the fixed reference point, and the control method proposed by the method is called a cable tower construction measurement control method based on a follow-up correction technology.
The cable tower is generally considered to be in a neutral state in the early morning, and a certain temperature difference gradient can exist in the section of the cable tower in fact, and wind load is often accompanied. Although the morning loft measurement may be selected, there is no guarantee that the cable plant is at the "zero" point at that time. On the other hand, the lofting of the cable tower section can last for a long time, and the lofting measurement is difficult to ensure to be completed in the early morning period. In the process of segment lofting, if computer simulation analysis is adopted for real-time correction, after the analysis is completed, the position of the cable tower may have changed, and larger construction errors can be brought.
For this purpose, a reference point (tracking prism) is set up on the structure close to the measurement point. If the coordinates of the prism under standard conditions (reference temperature about 18 ℃, no temperature difference and no wind condition) are known, namely the position of the prism 'zero' point, the displacement of the top of the structure due to the temperature difference and the static wind pressure is the displacement of the prism relative to the position of the 'zero' point. In order to obtain the zero point position of the prism, the tracking prism needs to be measured in the early morning, and the temperature, the wind speed and the wind direction are measured at the same time. Because the influence of wind and temperature gradient still exists at this time, the temperature and wind load effect needs to be corrected, and the zero point coordinate of the tracking prism is obtained. When the site lofting is carried out, the position of the tracking prism is measured again and compared with the zero point coordinate, and the difference value is regarded as the displacement of the cable tower from the zero point position. And correcting the lofting target position of the cable tower segment by using the displacement, so that all-weather lofting can be realized. The application principle of the follow-up correction technique is as follows in fig. 1.
Further, in the step of positioning and installing the stiff frameworks, when each neck framework is installed, the total station is used for measuring the coordinates and the heights of the top corner points of the neck frameworks, adjustment is carried out according to the difference value between the measured coordinates and the preset coordinates, and the neck frameworks are firmly welded with the lower joint neck frameworks after the adjustment is finished.
Further, the method further comprises a steel anchor beam installation step after the tower body pouring step, wherein in the steel anchor beam installation step, a steel anchor beam and a steel bracket support bracket are erected on the poured tower body.
And in the installation step of the steel anchor beam installation step, integrally hoisting the steel anchor beam into position by adopting a large-scale tower crane, carrying out position fine adjustment by using a jack according to measurement and tracking of a high-precision total station, and firmly welding stiffening ribs of bracket wall plates of the steel anchor beam with upright posts of the stiff framework to finish the installation.
And in the step of installing the cable-stayed cableway pipe, the position of the cableway pipe is accurately lofted through measurement, a positioning channel steel is welded to serve as a limit for installing the cableway pipe, then the plane position and the elevation of the cableway pipe are adjusted by using an upper chain block and a lower chain block, the plane position and the elevation of an upper opening and a lower opening of the cableway pipe are consciously and simultaneously reach preset coordinates and elevations, and finally the cable-stayed cableway pipe is welded on the stiff framework.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (5)
1. The construction process of the ultra-high special-shaped cable tower is characterized by comprising the following steps of:
positioning and mounting the stiffness frameworks, namely embedding steel plates at the positions of each corner point and each axis of the stiffness frameworks which are embedded in the bearing platform in advance, accurately lofting the steel plates by using a total station polar coordinate method after the concrete of the bearing platform reaches the design strength so as to determine positioning points, mounting the stiffness frameworks, aligning the stiffness frameworks with the positioning points, sequentially mounting the rest stiffness frameworks, and aligning each corner point and each axis of the upper and lower stiffness frameworks;
a step of installing tower column steel bars, in which a stiff framework is used as a locating frame, lofting is measured, locating steel bars are installed, then a steel tape is used for installing a vertical main steel bar on the locating steel bars according to a designed position, the vertical main steel bar is measured and lofted, then a steel tape is used for lofting on the vertical main steel bar, a horizontal steel bar and a template are installed, and after the template is installed, fine adjustment is carried out on the horizontal steel bar according to the position of the template;
and a tower body pouring step, namely erecting a high-precision total station at a forced centering control point preset on the opposite main pier, erecting a prism centering rod at each characteristic point of the template, collecting actual measurement plane and elevation data by the total station, calculating the longitudinal and transverse offset of each characteristic point of the template in real time, adjusting in real time, finally accurately adjusting the template to a preset position, pouring concrete, and forming the tower body after the concrete is solidified.
2. The ultra-high profile rope tower construction process according to claim 1, wherein: in the stiff framework positioning and mounting step, when each neck framework is mounted, the coordinate and the elevation of the top corner point of the neck framework are measured by a total station, the neck framework is adjusted according to the difference value between the measured coordinate and the preset coordinate, and the neck framework is firmly welded with the lower joint neck framework after the adjustment is completed.
3. The ultra-high profile rope tower construction process according to claim 1, wherein: and the step of pouring the tower body further comprises the step of installing the steel anchor beam, wherein in the step of installing the steel anchor beam, the steel anchor beam and the steel bracket support are erected on the poured tower body.
4. A process for constructing an ultra-high profile rope tower according to claim 3, wherein: in the steel anchor beam installation step, a large-scale tower crane is adopted to integrally hoist the steel anchor beam in place, a jack is used for carrying out position fine adjustment according to measurement and tracking of a high-precision total station, and a stiffening rib of a bracket wallboard of the steel anchor beam and a column of the stiff framework are firmly welded to finish installation.
5. A process for constructing an ultra-high profile rope tower according to claim 3, wherein: the steel anchor beam installation step is followed by a cable-stayed cableway pipe installation step, in which the position of the cableway pipe is accurately lofted on a cervical skeleton through measurement, positioning channel steel is welded to be used for limiting when the cableway pipe is installed, then the plane position and the elevation of the cableway pipe are adjusted by utilizing an upper chain block and a lower chain block, the plane position and the elevation of an upper opening and a lower opening of the cableway pipe are consciously and simultaneously reach preset coordinates and elevations, and finally the cable way pipe is welded on the stiff skeleton.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211740279.8A CN116084287A (en) | 2022-12-30 | 2022-12-30 | Construction process of ultra-high special-shaped cable tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211740279.8A CN116084287A (en) | 2022-12-30 | 2022-12-30 | Construction process of ultra-high special-shaped cable tower |
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| Publication Number | Publication Date |
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| CN116084287A true CN116084287A (en) | 2023-05-09 |
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| CN202211740279.8A Pending CN116084287A (en) | 2022-12-30 | 2022-12-30 | Construction process of ultra-high special-shaped cable tower |
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| CN (1) | CN116084287A (en) |
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- 2022-12-30 CN CN202211740279.8A patent/CN116084287A/en active Pending
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