CN110878523B - Multi-standard-wire-based suspension bridge main cable strand mark alignment erection method - Google Patents
Multi-standard-wire-based suspension bridge main cable strand mark alignment erection method Download PDFInfo
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- CN110878523B CN110878523B CN201910884175.6A CN201910884175A CN110878523B CN 110878523 B CN110878523 B CN 110878523B CN 201910884175 A CN201910884175 A CN 201910884175A CN 110878523 B CN110878523 B CN 110878523B
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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
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension 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
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
Abstract
The invention discloses a multi-standard-wire-based alignment erection method for marking main cable strands of a suspension bridge; the invention mainly solves the problems that the line shape requirement can be met only by measuring and adjusting the sag for multiple times under a relatively stable weather condition when a main cable strand is erected by a sag method at present, so that the construction period is long and the difficulty is high. After the cable strand erecting method provided by the invention is used, the sag adjustment is not needed, the influence of weather environment is avoided, and the aims of improving the main cable erecting quality and saving the construction period are fulfilled. The main cable strand manufactured by the method has greatly improved manufacturing precision, and the mark point of the main cable strand is superposed with the IP point of the main cable after the reference cable strand is placed in the saddle of the main cable during the erection of the main cable, so that the sag of the main cable is not required to be adjusted. The construction period is saved for the erection of the main cable of the suspension bridge, particularly the erection period from tens of days to months can be saved under the environment with severe weather conditions, and the erection method is simplified.
Description
Technical Field
The invention relates to the related field of main cable strands of a suspension bridge, in particular to a marking, aligning and erecting method for main cable strands of a suspension bridge based on multi-standard wires.
Background
The main cable is the most important main stress member of the suspension bridge, and the cable shape of the main cable can not be adjusted after the bridge is formed, so that the cable strand erection line shape of the prefabricated parallel steel wire main cable is the key for influencing the quality of the main cable.
The main cable strand erection adjustment aims to keep or infinitely approach the length of a main cable of each span to a theoretical value. Theoretically, if the calculation of the length of each span of the main cable strand is very accurate and the manufacturing precision is enough, the main cable is naturally in a theoretical linear shape only by placing each span of the main cable in each saddle and aligning the span mark points on the strands with the span mark points on the saddles, and the main cable is not required to be adjusted in a linear shape.
In practical engineering, because the main cable prefabricated strand is long, it is difficult to find a site to be completely unfolded in a factory for accurate measurement, and the strand manufacturing length is still large in error although complicated control is performed in the factory. Therefore, after the cable strand is unfolded on an erection site, the actual displayed line shape (sag) of the cable strand is measured for multiple times, the actual length of the span is calculated reversely according to the measured line shape, after the actual length of the span is compared with the theoretical length required by the span, the redundant cable strand length is adjusted out or the short cable strand length is adjusted in from the adjacent span, all span cable strands cannot be completely erected in parallel, the error of the mid-span is adjusted to the side span, the side span is adjusted to the anchor span, finally all the cable strand length errors are driven to the anchor span, the anchor span is provided with a length adjusting pull rod, finally the error is eliminated through the tensioning of the anchor span and the adjustment of the working length of the anchor span pull rod, the erection of the cable strand of the parallel steel wire main cable by the sag method is performed, and the erection of the anchor span by the tension method. The reference strand is an absolute sag method, and the common strand is a relative sag method.
The sag method is skillfully arranged, manufacturing errors in a factory are displayed on site through sag, the sag and the length have one-to-one correspondence, the purpose of adjusting the length can be achieved by adjusting the sag, but the sag measurement needs to be accurate, the process has strict requirements on weather, and the sag measurement needs to be carried out under the weather conditions of small temperature fluctuation, no rainfall and small wind power. The erection measurement is carried out in a field, the environmental conditions cannot be controlled, wind easily causes displacement and vibration of the cable strand, the cable strand cannot work in rainy days or rainwater on the cable strand can influence the linear calculation of the cable strand, and the measuring instrument has errors, so that the implementation difficulty of the method is high, particularly, the erection environment is severe, the temperature and wind power change is large, the meteorological requirement of sag adjustment is often difficult to achieve, cable erection construction is delayed for months in extreme cases, the arrangement of bridge construction progress is seriously influenced, and variable meteorological conditions can also greatly influence the erection precision and quality of the main cable.
Therefore, it is still necessary to improve the in-plant manufacturing accuracy. In order to improve the main cable erection precision and quality, overcome the influence of weather environment on the main cable erection and achieve the purpose that the main cable strand does not need to be adjusted, the invention provides a novel suspension bridge main cable strand erection method, namely multi-standard wire strand erection. On the basis of accurately calculating the manufacturing length of the main cable, the lengths of a plurality of standard wires for marking the cable strands are selected through probability statistics and analysis, the marking error of the main cable strands is reduced, all main cable strands are placed in all saddles on site, span marking points on the cable strands are aligned with span marking points on the saddles, sag adjustment is not needed, the purpose that cable strand erection is not affected by weather is achieved, and the construction period is greatly shortened.
Disclosure of Invention
Therefore, in order to solve the above-mentioned disadvantages, the present invention provides a method for positioning and erecting a main cable strand mark of a suspension bridge based on multi-standard wires; the invention mainly solves the problems that the line shape requirement can be met only by measuring and adjusting the sag for multiple times under a relatively stable weather condition when a main cable strand is erected by a sag method at present, so that the construction period is long and the difficulty is high. After the cable strand erecting method provided by the invention is used, the sag adjustment is not needed, the influence of weather environment is avoided, and the aims of improving the main cable erecting quality and saving the construction period are fulfilled.
The invention is realized in this way, constructs a multi-standard-wire-based suspension bridge main cable strand mark alignment erection method, and is characterized in that:
the implementation steps are as follows;
(1) determining the layer distance of the cable strands: in order to definitely judge that the upper layer of cable strands does not press down the lower layer of cable strands and also enable the erected cable strands to be ventilated and radiated before cable tightening, gaps are required to be reserved among the cable strands, the maximum layer distance of the midspan section is delta, and the layer distance D of the cable strands is equal to D + delta, wherein D is the designed layer distance;
(2) accurately calculating the blanking length of the cable strand: obtaining the stress-free length L of the main cable strand through finite element modeling calculation, wherein the influence of a reserved gap delta between each layer of the strand is considered during calculation; the length of each cable strand is given in a segmented mode, and the segmentation points are the IP position of each cable saddle, the mid-span point and the anchoring point;
(3) manufacturing standard wires: drawing the qualified steel wires to a standard wire production line, and marking the steel wires by using an indoor baseline segmentation method or other methods with higher precision to manufacture a plurality of standard wires; the manufacturing precision of the standard wires is above L/20000, and each standard wire is precisely marked;
(4) selection and arrangement of the number of standard filaments: determining the number of standard wires meeting the requirement according to the one-to-one correspondence relationship between the lengths and the line shapes of the strands, the error formula of the multi-standard wire strands and the requirement of the specification on the erection precision of the main cable strands; for convenience of measurement, arranging a plurality of selected standard wires at the top or side positions of the reference strand;
(5) length marking of the strand: drawing all steel wires of the cable strand, arranging the positions of a plurality of standard wires, ensuring that the first mark points of the standard wires are aligned, wherein the alignment error is less than 2mm, calibrating the starting point and the ending point of the cable strand according to the lengths of the selected standard wires, and determining the accurate blanking length of the main cable strand;
in order to align the marking point and the cable saddle IP point during erection, the marking point position of the cable strand needs to be determined according to the marking point position of the standard wire. When marking, selecting the marking point position of 1 standard wire as reference, and measuring the distance between each marking point position of each standard wire and the reference position;
the marking position of the marking point of the strand is the distance from the ith standard wire to the marking point position of the reference standard wire
Wherein
The average value of the distance between each standard silk marking point and the reference standard silk marking point is obtained (i is the number of the selected standard silk); after the mean value of the positions of all the marking points is obtained, marking the reference cable strand at the mean value position;
(6) manufacturing marks in saddle factories: in order to align the standard wire marking point and the cable saddle IP point during erection, the main cable saddle IP point needs to be marked at a design position during processing of the main cable saddle in a factory;
(7) cable saddle installation: after the construction of the tower top portal frame is finished, hoisting each component of the main cable saddle to the top of the bridge tower in multiple times and installing the components at the designed position;
(8) strand length change value: due to bridge tower construction deviation, cable saddle position deviation and deviation between the actual elastic modulus and expansion coefficient of the cable strand and the design deviation existing in the bridge tower construction process, the actual saddle IP point has fixed deviation with a theoretical value, and therefore the cable strand length change value needs to be obtained through anchor tower joint measurement before the reference cable is erected according to the mark point;
(9) saddle strand pair site correction: the influence of the length change of the cable strand caused by the error factors on each cable strand is approximately the same, so that the length change of the cable strand can be converted into the correction of the mark point of the main cable saddle, and the correction and marking of the cable strand position point at the cable saddle are carried out;
(10) and (3) positioning and erecting the cable strands: and after the cable strand alignment point at the cable saddle is corrected, erecting a reference cable strand according to the corrected position, and aligning and erecting the marking point of the reference cable strand and the corrected cable strand alignment point.
The invention has the following advantages: the invention provides a multi-standard-wire-based alignment erection method for main cable strand marks of a suspension bridge; the invention mainly solves the problems that the line shape requirement can be met only by measuring and adjusting the sag for multiple times under a relatively stable weather condition when a main cable strand is erected by a sag method at present, so that the construction period is long and the difficulty is high. After the cable strand erecting method provided by the invention is used, the sag adjustment is not needed, the influence of weather environment is avoided, and the aims of improving the main cable erecting quality and saving the construction period are fulfilled. The main cable strand manufactured by the method has greatly improved manufacturing precision, and the mark point of the main cable strand is superposed with the IP point of the main cable after the reference cable strand is placed in the saddle of the main cable during the erection of the main cable, so that the sag of the main cable is not required to be adjusted. The construction period is saved for the erection of the main cable of the suspension bridge, particularly the erection period from tens of days to months can be saved under the environment with severe weather conditions, and the erection method is simplified.
Drawings
FIG. 1 is a schematic flow diagram of a process embodying the present invention;
FIG. 2 is a schematic diagram of strand lay-up;
FIG. 3 is a schematic diagram of three-span suspension bridge marking point positions;
FIG. 4 is a schematic of a standard silk marking process;
FIG. 5 is a schematic view of the arrangement of standard filaments in a reference cord;
FIG. 6 is a schematic view of a multi-standard strand marker marking location;
FIG. 7 is a factory label of an overhead saddle;
FIG. 8 is a schematic view of correction of the position of the saddle alignment point on the top of the tower;
FIG. 9 is a schematic view of the strand alignment;
fig. 10 is a schematic diagram comparing the position of the reference cable mark with the position of the tower top saddle mark in the example.
Detailed Description
The present invention will be described in detail with reference to fig. 1 to 10, and the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a multi-standard-wire-based suspension bridge main cable strand mark alignment erection method through improvement; the principle of the invention is introduced: currently, for the manufacture of a main cable strand, a single standard wire is used for calibrating the length, and length marking points on the standard wire are length marking points on the cable strand. The invention provides that the length of one strand is calibrated by adopting multiple standard wires during strand manufacturing, the process manufacturing technology of the standard wires and the main cable strand is consistent with the prior art, but the length marking points of the strands take the average value of the positions of the strands after the strands are stranded, so that the length precision of the strands is improved. When the precision is improved to a certain degree, the cable strand can be erected by aligning with the mark points on the cable saddle without complicated verticality adjustment.
The standard wire is generally manufactured by a base line length measuring method, and is affected by the length of the base line, the self-weight sag of the steel wire and the like, and the standard wire has high precision but has errors. The standard wire is woven into the strand, and the length of the strand is not completely equal to the length measured when the standard wire is manufactured at the early stage under the influence of the strength and the uniformity of the steel wire turntable force. The main cable strand manufacturing and measuring are complex manufacturing processes, and the manufacturing length error is influenced by multiple factors, such as temperature change, steel wire elastic modulus, weight tension, steel wire diameter dispersion, base line roller mounting accuracy, base line measuring error and the like. The error of the abnormal processing condition is eliminated, the error of the manufacturing length of the cable strand can be considered to follow the normal distribution rule, and the normal distribution function is as the formula (1):
y-is the probability density of strand manufacturing errors;
x-is a strand error random variable;
mu-is the arithmetic mean of the strand error random variables;
sigma-is the standard deviation of the strand error random variable;
the normal distribution curve reflects that the actual size is mostly concentrated around the average size, the standard deviation reflects the width of the curve, and the smaller the standard deviation value is, the narrower the curve is, namely the size dispersion is smaller, so that the value is reduced, and the manufacturing precision of the cable strand can be improved.
When the single standard wire is adopted for manufacturing the cable strand, the mean value and the standard deviation of the length error of the standard wire are respectively. The manufacturing accuracy of the main cable strand manufactured by using the steel wire as the standard follows a normal distribution function f (mu)1,σ1)
When the double standard wires are used for manufacturing, the average value and the standard deviation of the error of the 2 nd standard wire are respectively set as follows, the manufacturing precision of the cable strand manufactured by using the double standard wires is in accordance with the formula (2):
let us say, the standard deviation of precision of the strand manufactured by the double-standard wire is formula (3):
similarly, the standard deviation of the manufacturing error of the strand when the multi-standard wire is adopted is shown as the formula (4)
Since the standard yarns are manufactured by the same process and the same measuring table, the difference of the error distribution is very small, and the manufacturing error distribution of each strand is considered to be the same in the limit condition, that is, the standard deviation of the manufacturing errors of the plurality of standard yarns is formula (5):
the above formula shows that: the precision of the strand is multiplied as the number of standard filaments increases. In order to quantify the reduction degree of the multi-standard wire method on the strand manufacturing error, the strand error probability function needs to be integrated to obtain the probability of error occurrence, and the integration on the normal distribution function comprises the following steps:
in the formula:
the random error in making length for a multi-standard strand is z sigma,
sigma is the standard deviation of random error of the multi-standard strand manufacturing length,
phi (Z) is the normal probability integral of the random error;
the probability of random errors occurring within is 2 phi (Z) and the probability of overshooting is 1-2 phi (Z). When a P value is given, that is, a confidence probability is given, the distribution range of the error under the confidence probability [ -, + ] is the confidence range, and it can be seen that the smaller the confidence range is, the smaller the error range is, the higher the manufacturing accuracy is. The confidence intervals for making the strand using the multi-standard filaments are shown in the following table:
TABLE 1 confidence interval table for strand production from multi-standard filaments
As can be seen from table 1, under the same confidence, the multi-standard wire method reduces the standard deviation of the strand, thereby reducing the confidence interval and improving the manufacturing accuracy. However, as can be seen from the statistical principle, when the number of standard wires is greater than 10, the accuracy is improved more slowly, and when Z is increased, although the confidence probability is also increased, the number of standard wires required for achieving the cable strand erecting accuracy is also greatly increased, and the manufacturing cost of the cable strand is greatly increased. Therefore, the proper standard number of wires is selected when the main cable is actually erected.
The invention comprises the following implementation steps: the process flow is shown in figure 1; the implementation steps of the invention are as follows;
(1) determining the layer distance of the cable strands: the actual erected section cannot be as compact as the design drawing. In order to definitely judge that the upper layer of cable strand does not press down the lower layer of cable strand and also to enable the erected cable strand to be ventilated and radiated before cable tightening, gaps are required to be reserved among the cable strand layers, the maximum layer distance of the midspan section is delta, and the layer distance D of the cable strand is D + delta, wherein D is the designed layer distance, as shown in FIG. 2 (a schematic diagram of the layer distance of the cable strand in FIG. 2);
(2) accurately calculating the blanking length of the cable strand: the stress-free length L of the main cable strand is obtained through finite element modeling calculation, and the influence of a reserved gap delta between each layer of the strand is considered during calculation. The length of each cable strand is given in a segmented mode, and the segmentation points are the IP position of each cable saddle, the mid-span point and the anchoring point. Taking a three-span main cable suspension bridge as an example, the suspension bridge can be divided into 8 segments of 9 marking points for marking, and the marking positions are as shown in (fig. 3, schematic diagram of marking point positions of the three-span suspension bridge):
m 0-relative position point of anchor cup mouth and cable strand when left bank anchor head is poured;
ml-vertical bending tangent point (cut surface) of left bank cable saddle;
m 2-left bank crossing middle marker point;
m 3-left shore main cable saddle marking point;
m4 — mid-span marker points;
m 5-marking point of main cable saddle on right bank;
m 6-right bank crossing middle marker point;
m 7-vertical bending tangent point (cut surface) of the cable saddle on the right bank;
m 8-marking point of relative position of anchor head and steel wire when casting anchor head on right bank.
When the bridge saddle is manufactured, the cable saddle mark is carried out on the mark position of the cable strand at the saddle, so that the mark point of the cable strand is aligned and erected when the main cable is erected.
(3) Manufacturing standard wires: and drawing the qualified steel wires to a standard wire production line, and marking the steel wires by using an indoor baseline segmentation method or other methods with higher precision to manufacture a plurality of standard wires. The manufacturing precision of the standard wires is above L/20000, and each standard wire is precisely marked. The marking points are made as follows: spraying red paint and blue paint at the marked position along the length direction of the steel wire, wherein the width of each paint is 60mm, and the red and blue boundary is a standard wire marking control section (for example, a schematic diagram of a standard wire marking method in figure 4):
(4) selection and arrangement of the number of standard filaments: and determining the number of standard wires meeting the requirement according to the one-to-one correspondence relationship between the lengths and the line shapes of the strands, the error formula of the multi-standard wire strands and the requirement of the specification on the erection precision of the main cable strands. For the convenience of measurement, a plurality of standard wires are arranged at the top or side position of the reference strand, as shown in (the arrangement diagram of the standard wires in the reference strand in fig. 5).
(5) Length marking of the strand: all steel wires of the drawn cable strand are arranged according to the position of a plurality of standard wires shown in the attached drawing 5, the alignment of the first mark points of the standard wires is ensured, the alignment error is less than 2mm, the starting point and the ending point of the cable strand are calibrated according to the lengths of the selected standard wires, and the accurate blanking length of the main cable strand is determined. In order to align the marking point and the cable saddle IP point during erection, the marking point position of the cable strand needs to be determined according to the marking point position of the standard wire. During marking, the marking point positions of 1 standard wire are selected as reference, and the distance between each marking point position of each standard wire and the reference position is measured, as shown in fig. 6, and the schematic diagram of the marking positions of the marking points of the multi-standard wire strand in fig. 6 is shown.
The positions of the marking points of the standard filaments at intervals in the drawing are the distances from the ith standard filament to the reference standard filament marking point, and the marking positions of the strand marking points are
Wherein
The average of the distance between each standard wire marking point and the reference standard wire marking point (i is the selected number of standard wires). And after the mean value of the positions of all the marking points is obtained, marking the reference cable strand at the mean value position.
(6) Manufacturing marks in saddle factories: in order to align the standard wire marking point and the cable saddle IP point during erection, the main cable saddle IP point needs to be marked at a designed position during machining of the main cable saddle in a factory. The saddle factory internal labeling is shown in fig. 7 (fig. 7 tower top saddle factory internal labeling).
(7) Cable saddle installation: after the construction of the tower top portal frame is completed, hoisting each component of the main cable saddle to the top of the bridge tower in times and installing the components at the designed position.
(8) Strand length change value: due to the construction deviation of the bridge tower, the position deviation of the cable saddle and the deviation of the actual elastic modulus and expansion coefficient of the cable strand and the design deviation in the construction process of the bridge tower, the actual IP point of the saddle has a fixed deviation from a theoretical value, and therefore the cable strand length change value needs to be obtained through anchor tower joint measurement before the reference cable is erected according to the mark point.
(9) Saddle strand pair site correction: the length change of the cable strand caused by the error factors has approximately the same influence on each cable strand, so the length change of the cable strand can be converted into the correction of the mark point of the main cable saddle, and the correction and marking of the cable strand position at the cable saddle are carried out. For example, according to the measurement, when the alignment point at the tower top saddle in the cable strand needs to be moved to the side span, the correction of the alignment point is shown in fig. 8 (fig. 8 is a schematic diagram of the correction of the alignment point position of the tower top saddle).
(10) And (3) positioning and erecting the cable strands: after the strand alignment point at the saddle is corrected, the reference strand is erected according to the corrected position, and as shown in fig. 9 (fig. 9, a strand alignment erection diagram) the marking point of the reference strand is aligned with the corrected strand alignment point.
Has the advantages that: the main cable strand manufactured by the method has greatly improved manufacturing precision, and the mark point of the main cable strand is superposed with the IP point of the main cable after the reference cable strand is placed in the saddle of the main cable during the erection of the main cable, so that the sag of the main cable is not required to be adjusted. The construction period is saved for the erection of the main cable of the suspension bridge, particularly the erection period from tens of days to months can be saved under the environment with severe weather conditions, and the erection method is simplified.
The present invention has been successfully applied to the main cable manufacture and erection of red river bridges, which have four marking point positions of m3 (Guizhou side tower top saddle) and m4 (Sichuan side tower top saddle) as shown in figure 10 after the reference strand is installed in place. As can be seen from fig. 10, the marking position (demarcations of blue-red colored filaments) of the main cable reference strand on the upstream and downstream of the both banks at the tower top saddle is just at the saddle marking position (at the bulkhead joint). The accuracy of the erection line shape of the reference cable strand is consistent with the accuracy of the designed line shape, and the sag adjustment is not needed. The multi-standard-wire-based suspension bridge main cable strand marking and aligning erection method greatly improves the manufacturing precision of the main cable strand, saves the cable adjusting workload and shortens the construction period for bridge construction.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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 invention. Thus, the present invention 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 (1)
1. A multi-standard-wire-based suspension bridge main cable strand mark alignment erection method is characterized by comprising the following steps of: the implementation steps are as follows;
(1) determining the layer distance of the cable strands: in order to definitely judge that the upper layer of cable strands does not press down the lower layer of cable strands and also enable the erected cable strands to be ventilated and radiated before cable tightening, gaps are required to be reserved among the cable strands, the maximum layer distance of the midspan section is delta, and the layer distance D of the cable strands is equal to D + delta, wherein D is the designed layer distance;
(2) accurately calculating the blanking length of the cable strand: obtaining the stress-free length L of the main cable strand through finite element modeling calculation, wherein the influence of a reserved gap delta between each layer of the strand is considered during calculation; the length of each cable strand is given in a segmented mode, and the segmentation points are the IP position of each cable saddle, the mid-span point and the anchoring point;
(3) manufacturing standard wires: drawing the qualified steel wires to a standard wire production line, and marking the steel wires by using an indoor baseline segmentation method or other methods with higher precision to manufacture a plurality of standard wires; the manufacturing precision of the standard wires is above L/20000, and each standard wire is precisely marked;
(4) selection and arrangement of the number of standard filaments: determining the number of standard wires meeting the requirement according to the one-to-one correspondence relationship between the lengths and the line shapes of the strands, the error formula of the multi-standard wire strands and the requirement of the specification on the erection precision of the main cable strands; for convenience of measurement, arranging a plurality of selected standard wires at the top or side positions of the reference strand;
(5) length marking of the strand: drawing all steel wires of the cable strand, arranging the positions of a plurality of standard wires, ensuring that the first mark points of the standard wires are aligned, wherein the alignment error is less than 2mm, calibrating the starting point and the ending point of the cable strand according to the lengths of the selected standard wires, and determining the accurate blanking length of the main cable strand;
in order to align the marking point and the cable saddle IP point during erection, the marking point position of the cable strand needs to be determined according to the marking point position of the standard wire; when marking, selecting the marking point position of 1 standard wire as reference, and measuring the distance between each marking point position of each standard wire and the reference position;
the marking position of the marking point of the strand is the distance from the ith standard wire to the marking point position of the reference standard wire
Wherein
The average value of the distance from each standard silk marking point to the reference standard silk marking point is shown, and i is the number of the selected standard silk; after the mean value of the positions of all the marking points is obtained, marking the reference cable strand at the mean value position;
(6) manufacturing marks in saddle factories: in order to align the standard wire marking point and the cable saddle IP point during erection, the main cable saddle IP point needs to be marked at a design position during processing of the main cable saddle in a factory;
(7) cable saddle installation: after the construction of the tower top portal frame is finished, hoisting each component of the main cable saddle to the top of the bridge tower in multiple times and installing the components at the designed position;
(8) strand length change value: due to bridge tower construction deviation, cable saddle position deviation and deviation between the actual elastic modulus and expansion coefficient of the cable strand and the design deviation existing in the bridge tower construction process, the actual saddle IP point has fixed deviation with a theoretical value, and therefore the cable strand length change value needs to be obtained through anchor tower joint measurement before the reference cable is erected according to the mark point;
(9) saddle strand pair site correction: the influence of the length change of the cable strand caused by the error factors on each cable strand is approximately the same, so that the length change of the cable strand is converted into the correction of the mark point of the main cable saddle, and the position point of the cable strand at the cable saddle is corrected and marked;
(10) and (3) positioning and erecting the cable strands: and after the cable strand alignment point at the cable saddle is corrected, erecting a reference cable strand according to the corrected position, and aligning and erecting the marking point of the reference cable strand and the corrected cable strand alignment point.
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| CN111705674B (en) * | 2020-06-30 | 2021-03-09 | 西南交通大学 | Method for positioning and erecting suspension bridge main cable to prefabricate parallel cable strands based on scale cable strands |
| CN112411388A (en) * | 2020-11-26 | 2021-02-26 | 西南交通大学 | Alignment erection method for main cable strand marks of suspension bridge based on multi-reference cable strands |
| CN113417216B (en) * | 2021-07-09 | 2023-04-25 | 长安大学 | Method for erecting main cable of suspension bridge without reference cable strand |
| CN113945436B (en) * | 2021-08-31 | 2023-01-17 | 江苏法尔胜缆索有限公司 | Manufacturing method of high-precision super-long suspension bridge main cable strand standard wire |
| CN114411552A (en) * | 2021-12-17 | 2022-04-29 | 江苏法尔胜缆索有限公司 | High-precision reference cable strand manufacturing and marking method for main cable of suspension bridge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3435118A1 (en) * | 1984-09-25 | 1986-04-03 | Rudolf Dipl.-Ing. 7000 Stuttgart Bergermann | METHOD AND DEVICE FOR ANCHORING ROPES OF HIGH-STRENGTH STEEL WIRE |
| US6728987B1 (en) * | 2002-04-23 | 2004-05-04 | Ch2M Hill, Inc. | Method of adjusting the vertical profile of a cable supported bridge |
| CN2908602Y (en) * | 2006-04-30 | 2007-06-06 | 江苏法尔胜新日制铁缆索有限公司 | Structure for measuring and controlling length error of steel wire in main wirerope of suspension bridge |
| CN201933410U (en) * | 2011-03-03 | 2011-08-17 | 重庆万桥交通科技发展有限公司 | Main cable strand |
| CN104746428A (en) * | 2013-12-31 | 2015-07-01 | 上海浦江缆索股份有限公司 | Precision control method for stay rope manufacturing |
| CN105421244B (en) * | 2015-12-10 | 2017-07-28 | 江苏法尔胜缆索有限公司 | A kind of preparation method of main rope of suspension bridge Prefabricated parallel preshaping of wire strand |
| CN106284082B (en) * | 2016-08-15 | 2019-03-08 | 云南云岭桥隧科技有限公司 | Main rope of suspension bridge strand is preforming and erection construction method |
| CN108677723B (en) * | 2018-05-30 | 2020-11-27 | 江苏法尔胜缆索有限公司 | Construction method for external prestress finished cable of filled epoxy coating steel strand |
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