CN117904976A - Cable-stayed bridge cable tower construction method - Google Patents
Cable-stayed bridge cable tower construction method Download PDFInfo
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- CN117904976A CN117904976A CN202410172268.7A CN202410172268A CN117904976A CN 117904976 A CN117904976 A CN 117904976A CN 202410172268 A CN202410172268 A CN 202410172268A CN 117904976 A CN117904976 A CN 117904976A
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- 238000010276 construction Methods 0.000 title claims abstract description 99
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000003754 machining Methods 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 40
- 238000009434 installation Methods 0.000 claims description 17
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 238000003466 welding Methods 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000036561 sun exposure 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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Abstract
The invention belongs to a cable tower construction method of a cable-stayed bridge, belonging to the technical field of cable tower construction of cable towers of cable-stayed bridges. Stiff skeleton positioning: machining the stiff framework to a set size at a machining site, and then positioning the stiff framework on site, wherein the bottom surface of the stiff framework is positioned according to the axis of the existing concrete surface; the top surface is controlled by hanging a vertical ball on the top surface axis of the stiff skeleton, roughly fixing the stiff skeleton by adjusting the inclination of the vertical ball to coincide with the projection of the top surface axis of the stiff skeleton of the constructed section, then erecting instruments at control points on two sides of a river levee, measuring the coordinates of the longitudinal and transverse axis points of the stiff skeleton by using a coordinate method, comparing the coordinates with a set value, adjusting the stiff skeleton according to the difference value, measuring the longitudinal and transverse axes of the stiff skeleton, and reinforcing the stiff skeleton after the stiff skeleton is positioned. The construction method of the cable-stayed bridge cable tower has simple steps, can conveniently and rapidly finish the construction of the cable-stayed bridge cable tower, reduces errors, improves the operation precision of the cable-stayed bridge cable tower, and ensures the overall construction quality of the cable-stayed bridge.
Description
Technical Field
The invention belongs to the technical field of cable tower construction of a cable-stayed bridge, and particularly relates to a cable tower construction method of the cable-stayed bridge.
Background
The technology is named as a stiffening skeleton for positioning a cable saddle of a cable-stayed bridge of a short tower and the publication number is CN210507144U, and provides a stiffening skeleton for positioning the cable saddle of the cable-stayed bridge of the short tower, wherein a column connecting part is connected with an embedded mounting part, a lower positioning part is connected with a column connecting part, a longitudinal connecting part is connected with a column connecting part, and a lower positioning part is vertically arranged with the column connecting part; at least three lower positioning parts are arranged below the wire-dividing pipe saddle, and the lower positioning parts are symmetrically arranged about the central line of the wire-dividing pipe saddle; the upper positioning part is arranged above the wire-dividing pipe saddle; two horizontal location portions and an upper portion location portion and a lower portion location portion form a rectangle location structure, divide silk pipe cable saddle all around with rectangle location structure contact, a plurality of rectangle location structure forms the location effect to divide silk pipe cable saddle. Through above-mentioned scheme, set up a plurality of rectangle location structures in stiffness skeleton, realize the positioning action to the wire-dividing tube cable saddle, each adapting unit adopts the perpendicular setting simultaneously, forms stable frame formula design, carries on conveniently, and the precision is high. However, this technique does not relate to the technical problem and technical solution of the present application.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the defects of the prior art, the construction method of the cable-stayed bridge cable tower is simple in steps, capable of conveniently and rapidly completing the construction of the cable-stayed bridge cable tower, reducing errors, improving the operation precision of the cable-stayed bridge cable tower and guaranteeing the overall construction quality of the cable-stayed bridge.
The technical scheme adopted by the invention is as follows:
the invention relates to a construction method of a cable-stayed bridge cable tower, which comprises the following construction measurement steps:
S1, positioning a stiff framework: machining the stiff framework to a set size at a machining site, and then positioning the stiff framework on site, wherein the bottom surface of the stiff framework is positioned according to the axis of the existing concrete surface; the top surface is controlled by hanging a vertical ball on the top surface axis of the stiff skeleton, roughly fixing the stiff skeleton by adjusting the inclination of the vertical ball to coincide with the projection of the top surface axis of the stiff skeleton of the constructed section, then erecting instruments at control points on two sides of a river levee, measuring the coordinates of the longitudinal and transverse axis points of the stiff skeleton by using a coordinate method, comparing the coordinates with a set value, adjusting the stiff skeleton according to the difference value, measuring the longitudinal and transverse axes of the stiff skeleton, and reinforcing the stiff skeleton after the stiff skeleton is positioned.
S2, installing and positioning a tower column template: the total station is arranged on a control point near, any control point is looked back, the actual measurement coordinate values of each angular point of the tower column template are measured and compared with the set coordinate values, the tower column template is adjusted so that the difference value between the actual measurement coordinate values and the set coordinate values does not exceed the set size, and then the template is fixed;
S3, installing and positioning a cable saddle: when the cable saddle is installed and positioned, the cable saddle and the stiff framework are integrally installed and positioned, the cable saddle is firstly roughly positioned on the frame of the machined stiff framework, then the stiff framework fixed with the cable saddle is integrally hoisted and installed on the main tower, and the cable saddle is finely adjusted after the stiff framework is installed and positioned, so that the coordinates of the cable saddle and the stiff framework meet the set requirements.
When the stiff framework is positioned, considering the influence of wind power on the stability of a hanging drop ball, positioning the middle points of the outer edge lines of the top surfaces of all sides of the stiff framework by using a steel rule before the stiff framework is hung, and positioning the transverse rough positioning and the longitudinal accurate positioning of constructors according to the positioned points; placing the prism head at the midpoint of the top surface of the stiff framework for transverse accurate positioning; after setting, welding one side of the stiff framework firmly, respectively placing the prism heads at two end points of the inner edge line of the top surface for measurement, calculating the distance which should be offset according to the measured data, and adopting a jack or a horizontal pushing device for longitudinal adjustment.
The rigid framework is slightly pre-biased, and the rigid framework can be biased back due to elasticity after the crane is unhooked, and can also be biased in the inclined direction; welding the stiff framework firmly after trimming and positioning, and retesting after unhooking to ensure accuracy; and (3) the construction lofting adopts polar coordinates to loft out the plane positions of four corner points of the stiff skeleton bottom of the top surface of the poured tower column, adjusts the positions of the stiff skeleton and the template to enable the stiff skeleton and the template to be in a set position, rechecks the plane coordinates and the elevations of the corner points of the stiff skeleton and the template, and ensures the gradient.
When the tower column template is installed and positioned, when the set coordinate value is calculated, the inner inclination and the outer inclination of the tower column are different, and according to the change of the transverse bridge distance of the top opening of the template caused by the inclination, the lofting coordinate calculated according to the standard template length is corrected, so that the inner inclination and the outer inclination of the tower column are ensured.
The template is adjusted by dividing the template into blocks to be matched and adjusted; each level of template control and detection are performed to ensure that the bottom opening is smooth, the flatness of the bottom opening meets the requirements, and the perpendicularity of the template meets the requirements; and when the flatness of the top opening of the template is deviated, a cushion block is added at the bottom of the template according to the deviation condition to rectify the deviation, and the template cannot be pulled by a guide chain or pushed by a jack forcibly, so that the deformation or fold line of the template is avoided.
The verticality of the tower column is controlled step by step, and the tower column is corrected step by step when the verticality deviation is large; when each stage of templates are turned up, pre-controlling is carried out according to the actual verticality of the tower column, and each stage is corrected; and when deviation occurs, a cushion block is added at the bottom of the template to correct the deviation according to the deviation condition, so that the template cannot be pulled by a guide chain or pushed by a jack.
The key point of lower tower column construction lofting is to ensure the design requirement of the inner and outer side surface gradient of the lower tower column; according to the central point of the tower base and the axle axis direction marks of the two tower piers, the column axis and the vertical mould side line of the bottom layer of the lower tower column are lofted, and meanwhile, the gradient of the inner side and the outer side of the tower column and the length of each section of template are pressed down to calculate the elevation and the coordinate of each angular point or axis point of the template; the method for controlling the elevation of the lower tower column and measuring the completion is carried out by using a geometric level method, lofting is carried out by using a triangular elevation, and when the actual lofting distance exceeds the lofting set distance and the angle of the actual lofting elevation angle exceeds the set angle, the control point is replaced to carry out repeated measurement and check so as to eliminate the influence of atmospheric refraction and earth curvature on the triangular elevation measurement.
The cable saddle installation positioning comprises cable saddle measurement and cable saddle installation positioning; when the cable saddle is measured, the cable saddle is positioned at the two ends of the stay cable and anchored on the box girder and the main tower, and the cable saddle is positioned by positioning the centers of the two ends of the cable saddle and the space positions of the outlet corner points of the cable saddle at the outer side of the box girder; when the cable saddle is positioned, the coordinate model is established by taking the intersection point of the bridge floor reference line and the central line of the bridge tower as the origin of coordinates, taking the forward direction of the bridge to the X-axis in the large mileage direction, taking the right side of the transverse bridge as the positive direction of the Y-axis, and taking the pointing tower top as the positive direction of the Z-axis; calculating the coordinates of the center and four corner points of the anchor backing plate according to the axis of the inhaul cable, measuring the coordinates of the center and the bottom end of the anchor backing plate by using a reflecting sheet after the saddle is lifted in place, comparing the coordinates with the set coordinate values, and adjusting the saddle to a position meeting the requirement of the set coordinate values; the pre-deflection set by monitoring the measurement result is considered in the adjustment process; and after the cable saddle is reeved, rechecking the two corner points at the upper end of the anchor backing plate by using a prism.
In order to ensure the installation precision of the cable saddle, a profile steel stiffness framework is arranged at the top of the tower, and the stiffness framework and the cable saddle are connected through a chain block; the steel reinforced skeleton is welded by adopting groove-shaped steel and comprises upright posts, parallel joints, diagonal braces and carrying pole beams, wherein chain blocks are arranged on the carrying pole beams; and after the stiff framework is hoisted to the top of the tower column, the position and elevation of the base are adjusted by using a total station so as to finely adjust the cable saddle, and after the position and the height are adjusted in place, the stiff framework and the pre-buried framework section steel are welded and fixed, and the position and the elevation of the stiff framework are retested.
After the construction of the cable-stayed bridge cable tower is completed, the construction measurement of the cable-stayed bridge cable tower is carried out, and the construction measurement of the cable-stayed bridge cable tower comprises the following steps: measuring the axial deviation and the section size of the tower seat; measuring the coordinates of the axial points and the characteristic angular points of the tower base; measuring the elevation of the bottom and the top of the tower seat; the main contents of the completion measurement of the tower column and the beam include: and measuring the plane positions and the elevations of the lower tower column, the lower cross beam, the upper tower column and the upper cross beam, and ensuring that the measured data meet the set values.
By adopting the technical scheme of the invention, the working principle and the beneficial effects are as follows:
The construction method of the cable-stayed bridge cable tower is concentrated on improving the construction process of rigid skeleton positioning, tower column template installation positioning and cable saddle installation positioning, and on the premise of not increasing the construction difficulty, the construction accuracy of rigid skeleton positioning, tower column template installation positioning and cable saddle installation positioning is improved, and the problem that the construction quality and the construction progress are adversely affected due to construction errors is solved. The method can be effectively applied to construction of different cable-stayed bridge towers, has strong universality, can effectively meet the construction requirements by strictly controlling the set parameters and carrying out the bottoms of the corresponding actual parameters and the corresponding parameters in the construction process, controls the construction quality and is convenient for construction measurement. Therefore, the method has strong operability and good construction effect, effectively controls construction quality, and reduces the problem of cost increase caused by reworking.
Detailed Description
The following describes the embodiments of the present invention, such as the shape and structure of each member, the mutual positions and connection relationships between each part, the roles and working principles of each part, etc., in further detail by describing examples:
the invention relates to a construction method of a cable-stayed bridge cable tower, which comprises the following construction measurement steps:
S1, positioning a stiff framework: machining the stiff framework to a set size at a machining site, and then positioning the stiff framework on site, wherein the bottom surface of the stiff framework is positioned according to the axis of the existing concrete surface; the top surface is controlled by hanging a vertical ball on the top surface axis of the stiff skeleton, roughly fixing the stiff skeleton by adjusting the inclination of the vertical ball to coincide with the projection of the top surface axis of the stiff skeleton of the constructed section, then erecting instruments at control points on two sides of a river levee, measuring the coordinates of the longitudinal and transverse axis points of the stiff skeleton by using a coordinate method, comparing the coordinates with a set value, adjusting the stiff skeleton according to the difference value, measuring the longitudinal and transverse axis of the stiff skeleton, and reinforcing the stiff skeleton after the stiff skeleton is positioned; s2, installing and positioning a tower column template: the total station is arranged on a control point near, any control point is looked back, the actual measurement coordinate values of each angular point of the tower column template are measured and compared with the set coordinate values, the tower column template is adjusted so that the difference value between the actual measurement coordinate values and the set coordinate values does not exceed the set size, and then the template is fixed; s3, installing and positioning a cable saddle: when the cable saddle is installed and positioned, the cable saddle and the stiff framework are integrally installed and positioned, the cable saddle is firstly roughly positioned on the frame of the machined stiff framework, then the stiff framework fixed with the cable saddle is integrally hoisted and installed on the main tower, and the cable saddle is finely adjusted after the stiff framework is installed and positioned, so that the coordinates of the cable saddle and the stiff framework meet the set requirements. The steps provide an improved technical scheme aiming at the defects in the prior art. Specifically, the invention focuses on improving the construction process of rigid skeleton positioning, tower column template mounting positioning and cable saddle mounting positioning, so that the operation precision of rigid skeleton positioning, tower column template mounting positioning and cable saddle mounting positioning is improved on the premise of not increasing the construction difficulty, and the problem that the construction quality and the construction progress are adversely affected due to the occurrence of errors in construction is effectively reduced. The construction method can be effectively applied to construction of different cable-stayed bridge towers, has strong universality, can effectively meet the construction requirements by strictly controlling the set parameters and carrying out the bottoms of the corresponding actual parameters and the corresponding parameters in the construction process, controls the construction quality and is convenient for construction measurement. Therefore, the method has strong operability and good construction effect, effectively controls construction quality, and reduces the problem of cost increase caused by reworking. The construction method of the cable-stayed bridge cable tower has simple steps, can conveniently and rapidly finish the construction of the cable-stayed bridge cable tower, reduces errors, improves the operation precision of the cable-stayed bridge cable tower, and ensures the overall construction quality of the cable-stayed bridge.
When the stiff framework is positioned, considering the influence of wind power on the stability of a hanging drop ball, positioning the middle points of the outer edge lines of the top surfaces of all sides of the stiff framework by using a steel rule before the stiff framework is hung, and positioning the transverse rough positioning and the longitudinal accurate positioning of constructors according to the positioned points; placing the prism head at the midpoint of the top surface of the stiff framework for transverse accurate positioning; after setting, welding one side of the stiff framework firmly, respectively placing the prism heads at two end points of the inner edge line of the top surface for measurement, calculating the distance which should be offset according to the measured data, and adopting a jack or a horizontal pushing device for longitudinal adjustment. The steps are aimed at the stiff framework positioning procedure, so that the longitudinal and transverse positioning of the stiff framework is reliably realized.
The rigid framework is slightly pre-biased, and the rigid framework can be biased back due to elasticity after the crane is unhooked, and can also be biased in the inclined direction; welding the stiff framework firmly after trimming and positioning, and retesting after unhooking to ensure accuracy; and (3) the construction lofting adopts polar coordinates to loft out the plane positions of four corner points of the stiff skeleton bottom of the top surface of the poured tower column, adjusts the positions of the stiff skeleton and the template to enable the stiff skeleton and the template to be in a set position, rechecks the plane coordinates and the elevations of the corner points of the stiff skeleton and the template, and ensures the gradient. The steps are aimed at the stiff skeleton positioning procedure, and the inclination is reliably ensured by controlling.
When the tower column template is installed and positioned, when the set coordinate value is calculated, the inner inclination and the outer inclination of the tower column are different, and according to the change of the transverse bridge distance of the top opening of the template caused by the inclination, the lofting coordinate calculated according to the standard template length is corrected, so that the inner inclination and the outer inclination of the tower column are ensured. The method aims at the stiff framework positioning procedure, corrects the lofting coordinates calculated according to the length of the standard template, and ensures the inner inclination and the outer inclination of the tower column.
The template is adjusted by dividing the template into blocks to be matched and adjusted; each level of template control and detection are performed to ensure that the bottom opening is smooth, the flatness of the bottom opening meets the requirements, and the perpendicularity of the template meets the requirements; and cleaning the mortar at the top and bottom openings of the template and sundries of welding slag. When the flatness of the top opening of the template is deviated, the verticality of the template is correspondingly deviated, and the errors are accumulated and transmitted, so that a cushion block is required to be added at the bottom of the template according to the deviation condition to correct the deviation, the template cannot be pulled by a guide chain or pushed by a jack, and the template is prevented from deforming or folding lines are avoided. The thickness of the cushion block is selected in combination with the verticality deviation. The steps are aimed at the step of installing and positioning the tower column template.
And controlling the verticality of the tower column step by step, and correcting step by step when the actual deviation value of the verticality exceeds the maximum range of the set value. The device is not suitable for being adjusted in place once; if the hard adjustment is carried out once, folding lines can appear on the side face of the tower column, so that a proper method is needed to correct the deviation. Because the perpendicularity of the tower column can certainly deviate due to construction, when each level of the formwork is turned up, the actual perpendicularity of the tower column is pre-controlled, each level is corrected, and when the correction is performed, the tightness of the formwork joint is noted, so that slurry leakage in the concrete pouring process is avoided. The perpendicularity of the template is pre-controlled in advance, and after deviation occurs, a cushion block is added to the bottom of the template to correct the deviation according to the deviation condition, so that the template cannot be pulled by a guide chain or pushed by a jack; and analyzing the actual verticality deviation of the poured tower column, and providing a construction basis for the post-pouring section. The steps are aimed at the step of installing and positioning the tower column template.
The key point of lower tower column construction lofting is to ensure the design requirement of the inclination of the inner side surface and the outer side surface of the lower tower column; according to the central point of the tower base and the axle axis direction marks of the two tower piers, the column axis and the vertical mould side line of the bottom layer of the lower tower column are lofted, and meanwhile, the gradient of the inner side and the outer side of the tower column and the length of each section of template are pressed down to calculate the elevation and the coordinate of each angular point or axis point of the template; the method for controlling the elevation of the lower tower column and measuring the completion is carried out by using a geometric level method, lofting is carried out by using a triangular elevation, and when the actual lofting distance exceeds the lofting set distance and the angle of the actual lofting elevation angle exceeds the set angle, the control point is replaced to carry out repeated measurement and check so as to eliminate the influence of atmospheric refraction and earth curvature on the triangular elevation measurement. The steps are aimed at the step of installing and positioning the tower column template.
The cable saddle installation positioning comprises cable saddle measurement and cable saddle installation positioning; when the cable saddle is measured, the cable saddle positioning is the key point of cable tower construction, the cable saddle is positioned at two ends of the stay cable and anchored on the box girder and the main tower, and comprises an anchor backing plate and an embedded pipe, and the cable saddle positioning is determined by positioning the centers of the two ends of the cable saddle and the spatial positions of the outlet corner points of the cable saddle at the outer side of the box girder (tower wall); when the cable saddle is positioned, the coordinate model is established by taking the intersection point of the bridge floor reference line and the central line of the bridge tower as the origin of coordinates, taking the forward direction of the bridge to the X-axis in the large mileage direction, taking the right side of the transverse bridge as the positive direction of the Y-axis, and taking the pointing tower top as the positive direction of the Z-axis; calculating the coordinates of the center and four corner points of the anchor backing plate according to the axis of the inhaul cable, measuring the coordinates of the center and the bottom end of the anchor backing plate by using a reflecting sheet after the saddle is lifted in place, comparing the coordinates with the set coordinate values, and adjusting the saddle to a position meeting the requirement of the set coordinate values; the pre-deflection set by monitoring the measurement result is considered in the adjustment process; and after the cable saddle is reeved, rechecking the two corner points at the upper end of the anchor backing plate by using a prism. Due to the sun exposure, the cable towers will deform a certain amount. In order to control the measurement accuracy, a time period with stable temperature in one day is selected for positioning the cable tower template and the cable saddle. In specific time, if the construction temperature in summer is too high, the construction temperature should be 9 days earlier, and the construction temperature should be 4 days later to black, so that the measurement can be carried out in overcast and rainy days, and if the construction temperature is too high, the construction can be carried out in winter, and the construction can be carried out in full daytime. This time period is chosen mainly to avoid the influence of too high a temperature (treated as the case may be). The above steps are directed to the saddle mounting and positioning process.
If the tower crane is adopted for lifting and installing the cable saddle, the construction is difficult, the construction time of the tower crane is long, and the precision is difficult to control. In the construction method, in order to ensure the installation precision of the cable saddle, a steel reinforced skeleton is arranged at the top of the tower, and the reinforced skeleton and the cable saddle are connected through a chain block; the steel reinforced skeleton is welded by adopting groove-shaped steel, and comprises upright posts, parallel joints, diagonal bracing and carrying pole beams, wherein chain blocks are arranged on the carrying pole beams; after the stiff framework is integrally hoisted to the top of the tower column, the position and elevation of the base are adjusted by using a total station so as to finely adjust a cable saddle, and after the position and the height are adjusted in place, the stiff framework and the pre-buried framework section steel are welded and fixed, and the position and the elevation of the stiff framework are retested. The above steps are directed to the saddle mounting and positioning process.
After the construction of the cable-stayed bridge cable tower is completed, the construction measurement of the cable-stayed bridge cable tower is carried out, and the construction measurement of the cable-stayed bridge cable tower comprises the following steps: measuring the axial deviation and the section size of the tower seat; measuring the coordinates of the axial points and the characteristic angular points of the tower base; and measuring the elevation of the bottom and the top of the tower seat. The main contents of the completion measurement of the tower column and the beam include: the plane positions and elevations of the lower tower column, the lower cross beam, the upper tower column and the upper cross beam were measured (each casting a section of tower column concrete, completion measurement was performed). The measurement data ensures that the set value is met.
The construction method of the cable-stayed bridge cable tower is concentrated on improving the construction process of rigid skeleton positioning, tower column template installation positioning and cable saddle installation positioning, and on the premise of not increasing the construction difficulty, the construction accuracy of rigid skeleton positioning, tower column template installation positioning and cable saddle installation positioning is improved, and the problem that the construction quality and the construction progress are adversely affected due to construction errors is solved. The method can be effectively applied to construction of different cable-stayed bridge towers, has strong universality, can effectively meet the construction requirements by strictly controlling the set parameters and carrying out the bottoms of the corresponding actual parameters and the corresponding parameters in the construction process, controls the construction quality and is convenient for construction measurement. Therefore, the method has strong operability and good construction effect, effectively controls construction quality, and reduces the problem of cost increase caused by reworking.
While the invention has been described above by way of example, it will be apparent that the invention is not limited to the above embodiments, but is capable of being carried out in various ways, by adopting the method of the invention and the technical scheme, or by directly applying the method of the invention and the technical scheme to other occasions without any improvement, without departing from the scope of the invention.
Claims (10)
1. A construction method of a cable-stayed bridge cable tower is characterized by comprising the following steps: the construction measurement steps of the cable-stayed bridge tower construction method are as follows:
S1, positioning a stiff framework: machining the stiff framework to a set size at a machining site, and then positioning the stiff framework on site, wherein the bottom surface of the stiff framework is positioned according to the axis of the existing concrete surface; the top surface is controlled by hanging a vertical ball on the top surface axis of the stiff skeleton, roughly fixing the stiff skeleton by adjusting the inclination of the vertical ball to coincide with the projection of the top surface axis of the stiff skeleton of the constructed section, then erecting instruments at control points on two sides of a river levee, measuring the coordinates of the longitudinal and transverse axis points of the stiff skeleton by using a coordinate method, comparing the coordinates with a set value, adjusting the stiff skeleton according to the difference value, measuring the longitudinal and transverse axes of the stiff skeleton, and reinforcing the stiff skeleton after the stiff skeleton is positioned.
S2, installing and positioning a tower column template: the total station is arranged on a control point near, any control point is looked back, the actual measurement coordinate values of each angular point of the tower column template are measured and compared with the set coordinate values, the tower column template is adjusted so that the difference value between the actual measurement coordinate values and the set coordinate values does not exceed the set size, and then the template is fixed;
S3, installing and positioning a cable saddle: when the cable saddle is installed and positioned, the cable saddle and the stiff framework are integrally installed and positioned, the cable saddle is firstly roughly positioned on the frame of the machined stiff framework, then the stiff framework fixed with the cable saddle is integrally hoisted and installed on the main tower, and the cable saddle is finely adjusted after the stiff framework is installed and positioned, so that the coordinates of the cable saddle and the stiff framework meet set values.
2. The cable tower construction method for the cable-stayed bridge according to claim 1, wherein: when the stiff framework is positioned, considering the influence of wind power on the stability of a hanging drop ball, positioning the middle points of the outer edge lines of the top surfaces of all sides of the stiff framework by using a steel rule before the stiff framework is hung, and positioning the transverse rough positioning and the longitudinal accurate positioning of constructors according to the positioned points; placing the prism head at the midpoint of the top surface of the stiff framework for transverse accurate positioning; after setting, welding one side of the stiff framework firmly, respectively placing the prism heads at two end points of the inner edge line of the top surface for measurement, calculating the distance which should be offset according to the measured data, and adopting a jack or a horizontal pushing device for longitudinal adjustment.
3. The cable tower construction method for the cable-stayed bridge according to claim 2, wherein: the rigid framework is slightly pre-biased, and the rigid framework can be biased back due to elasticity after the crane is unhooked, and can also be biased in the inclined direction; welding the stiff framework firmly after trimming and positioning, and retesting after unhooking to ensure accuracy; and (3) the construction lofting adopts polar coordinates to loft out the plane positions of four corner points of the stiff skeleton bottom of the top surface of the poured tower column, adjusts the positions of the stiff skeleton and the template to enable the stiff skeleton and the template to be in a set position, rechecks the plane coordinates and the elevations of the corner points of the stiff skeleton and the template, and ensures the gradient.
4. A cable-stayed bridge pylon construction method according to claim 3, wherein: when the tower column template is installed and positioned, when the set coordinate value is calculated, the inner inclination and the outer inclination of the tower column are different, and according to the change of the transverse bridge distance of the top opening of the template caused by the inclination, the lofting coordinate calculated according to the standard template length is corrected, so that the inner inclination and the outer inclination of the tower column are ensured.
5. The cable tower construction method for the cable-stayed bridge according to claim 4, wherein: the template is adjusted by dividing the template into blocks to be matched and adjusted; each level of template control and detection are performed to ensure that the bottom opening is smooth, the flatness of the bottom opening meets the requirements, and the perpendicularity of the template meets the requirements; and when the flatness of the top opening of the template is deviated, a cushion block is added at the bottom of the template according to the deviation condition to rectify the deviation, and the template cannot be pulled by a guide chain or pushed by a jack forcibly, so that the deformation or fold line of the template is avoided.
6. The cable tower construction method for the cable-stayed bridge according to claim 5, wherein: the verticality of the tower column is controlled step by step, and the tower column is corrected step by step when the verticality deviation is large; when each stage of templates are turned up, pre-controlling is carried out according to the actual verticality of the tower column, and each stage is corrected; and when deviation occurs, a cushion block is added at the bottom of the template to correct the deviation according to the deviation condition, so that the template cannot be pulled by a guide chain or pushed by a jack.
7. The cable tower construction method for the cable-stayed bridge according to claim 6, wherein: the key point of lower tower column construction lofting is to ensure the design requirement of the inner and outer side surface gradient of the lower tower column; according to the central point of the tower base and the axle axis direction marks of the two tower piers, the column axis and the vertical mould side line of the bottom layer of the lower tower column are lofted, and meanwhile, the gradient of the inner side and the outer side of the tower column and the length of each section of template are pressed down to calculate the elevation and the coordinate of each angular point or axis point of the template; the method for controlling the elevation of the lower tower column and measuring the completion is carried out by using a geometric level method, lofting is carried out by using a triangular elevation, and when the actual lofting distance exceeds the lofting set distance and the angle of the actual lofting elevation angle exceeds the set angle, the control point is replaced to carry out repeated measurement and check so as to eliminate the influence of atmospheric refraction and earth curvature on the triangular elevation measurement.
8. The cable tower construction method for the cable-stayed bridge according to claim 1, wherein: the cable saddle installation positioning comprises cable saddle measurement and cable saddle installation positioning; when the cable saddle is measured, the cable saddle is positioned at the two ends of the stay cable and anchored on the box girder and the main tower, and the cable saddle is positioned by positioning the centers of the two ends of the cable saddle and the space positions of the outlet corner points of the cable saddle at the outer side of the box girder; when the cable saddle is positioned, the coordinate model is established by taking the intersection point of the bridge floor reference line and the central line of the bridge tower as the origin of coordinates, taking the forward direction of the bridge to the X-axis in the large mileage direction, taking the right side of the transverse bridge as the positive direction of the Y-axis, and taking the pointing tower top as the positive direction of the Z-axis; calculating the coordinates of the center and four corner points of the anchor backing plate according to the axis of the inhaul cable, measuring the coordinates of the center and the bottom end of the anchor backing plate by using a reflecting sheet after the saddle is lifted in place, comparing the coordinates with the set coordinate values, and adjusting the saddle to a position meeting the requirement of the set coordinate values; the pre-deflection set by monitoring the measurement result is considered in the adjustment process; and after the cable saddle is reeved, rechecking the two corner points at the upper end of the anchor backing plate by using a prism.
9. The cable tower construction method for the cable-stayed bridge according to claim 8, wherein: in order to ensure the installation precision of the cable saddle, a profile steel stiffness framework is arranged at the top of the tower, and the stiffness framework and the cable saddle are connected through a chain block; the steel reinforced skeleton is welded by adopting groove-shaped steel and comprises upright posts, parallel joints, diagonal braces and carrying pole beams, wherein chain blocks are arranged on the carrying pole beams; and after the stiff framework is hoisted to the top of the tower column, the position and elevation of the base are adjusted by using a total station so as to finely adjust the cable saddle, and after the position and the height are adjusted in place, the stiff framework and the pre-buried framework section steel are welded and fixed, and the position and the elevation of the stiff framework are retested.
10. The cable tower construction method for the cable-stayed bridge according to claim 1, wherein: after the construction of the cable-stayed bridge cable tower is completed, the construction measurement of the cable-stayed bridge cable tower is carried out, and the construction measurement of the cable-stayed bridge cable tower comprises the following steps: measuring the axial deviation and the section size of the tower seat; measuring the coordinates of the axial points and the characteristic angular points of the tower base; measuring the elevation of the bottom and the top of the tower seat; the main contents of the completion measurement of the tower column and the beam include: and measuring the plane positions and the elevations of the lower tower column, the lower cross beam, the upper tower column and the upper cross beam, and ensuring that the measured data meet the set values.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410172268.7A CN117904976A (en) | 2024-02-07 | 2024-02-07 | Cable-stayed bridge cable tower construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410172268.7A CN117904976A (en) | 2024-02-07 | 2024-02-07 | Cable-stayed bridge cable tower construction method |
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| CN202410172268.7A Pending CN117904976A (en) | 2024-02-07 | 2024-02-07 | Cable-stayed bridge cable tower construction method |
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| Country | Link |
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