CN-121992722-A - Suspension bridge main cable erection method and system

CN121992722ACN 121992722 ACN121992722 ACN 121992722ACN-121992722-A

Abstract

The invention provides a method and a system for erecting a main cable strand of a suspension bridge, which realize systematic management and control of the main cable strand erection of the suspension bridge by installing a cable strand position restraining frame, dragging double-reference cable strands, linear adjustment, stability observation and a complete process of conventional cable strand erection. The cable strand position restraining frame is installed at equal intervals, a uniform supporting base is provided for cable strands, load distribution is reasonable, local stress concentration risks are reduced, symmetrical arrangement of double reference cable strands covers the lower half area of a main cable, installation freedom of the conventional cable strands is remarkably reduced through the addition of positioning reference objects, deviation accumulation caused by insufficient single reference positioning is avoided, a stability observation link judges a reference state through a preset threshold value, environmental fluctuation interference is eliminated, long-term reliability of the reference cable strands serving as references is guaranteed, and a solid foundation is laid for subsequent conventional cable strand erection.

Inventors

ZHOU JIN
LIU HONGYU
AI GUOQING
WANG KUN
CHEN XIN
Lu Hangchi
WANG YIFAN
LI HONGTAO
Ou changyang
YU XIANLIN
GUAN JIAN
Jiang Taiqi
ZHANG LONG
GUO LIFEI
LI CHAOCHENG

Assignees

中交二公局华东建设有限公司
江苏省交通工程建设局

Dates

Publication Date: 20260508
Application Date: 20260211

Claims (10)

1. A method of erecting a main cable strand for a suspension bridge, comprising: s1, installing cable strand position suppression frames, namely fixedly installing a plurality of cable strand position suppression frames on a catwalk according to main cable design parameters, so that the plurality of cable strand position suppression frames are equidistantly installed on the catwalk; S2, installing reference cable strands, namely pulling two reference cable strands to enable the two reference cable strands to be sequentially installed on all the position suppression frames and symmetrically arranged on the lower half part of the design section of the main cable, wherein an optical fiber grating sensor is integrated in each reference cable strand and used for monitoring stress data of the reference cable strands in real time; S3, reference cable strand shape adjustment, namely respectively carrying out linear detection on the two reference cable strands to obtain linear data, and carrying out linear adjustment on the two reference cable strands based on the linear data to enable the two reference cable strands to be in a designed linear condition; S4, carrying out stability observation on the reference cable strand, acquiring stress fluctuation of the reference cable strand through a fiber grating sensor in the process of stability observation, acquiring linear fluctuation of the reference cable strand through a total station, judging that the reference cable strand is in a stable state when the linear fluctuation and the stress fluctuation are both lower than a preset threshold value, and executing the step S5, otherwise, re-executing the step S3; And S5, conventional strand erection, namely traction erection of conventional strands by taking two reference strands as references, so that the conventional strands are arranged on all strand position restraining frames, and in the traction erection process, position rechecking is carried out on the two reference strands regularly until the traction erection operation of all conventional strands is completed.
2. The method for erecting a main cable strand of a suspension bridge according to claim 1, wherein said step S1 comprises: s1.1, selecting the installation interval between cable strand position suppression frames according to the design span of a main cable; S1.2, according to the installation interval between the strand restraining frames, the strand restraining frames are fixedly installed on the cross beam at the bottom of the catwalk by bolts in sequence.
3. The method for erecting a main cable strand of a suspension bridge according to claim 1, wherein said step S2 comprises: s2.1, respectively utilizing a winch to pull the reference cable strands on the supporting rollers, so that the two reference cable strands are respectively pulled into position; S2.2, respectively lifting the two reference strands into the set positions of the steel grooves on the corresponding strand restraining racks by using a transverse winch on the catwalk, and symmetrically arranging the two reference strands at the lower half part of the design section of the main cable; And S2.3, carrying out communication connection on the two reference strands and the demodulator to finish the installation of the reference strands.
4. The method for erecting a main cable strand of a suspension bridge according to claim 3, wherein in the step S2.2, the two reference cable strands are symmetrically arranged in a specific manner that a vertical central axis is established by taking a center of a cross section of the main cable as an origin, and the two reference cable strands are deflected 45 degrees to two sides respectively to form positioning extension lines, so that geometric centers of the two reference cable strands are overlapped with the positioning extension lines.
5. The method for erecting a main cable strand of a suspension bridge according to claim 1, wherein said step S3 comprises: S3.1, respectively installing reflecting prisms at positions corresponding to the two reference cable strands and the main cable characteristic points, wherein the main cable characteristic points are 1/2 span, 1/4 span, 1/8 span and 1/16 span positions of the main cable, and the distance between adjacent characteristic points is not more than 200 meters; s3.2, based on the reflecting prisms on the two reference strands, synchronously acquiring the characteristic point elevation and the reference strand line shape by using a total station respectively; and S3.3, according to the acquired characteristic point elevation and the reference strand shape, carrying out linear adjustment on the two reference strands so as to enable the two reference strands to be under the designed linear condition.
6. The method for erecting a main rope strand of a suspension bridge according to claim 1, wherein the step S4 of observing the stability of the reference rope strand comprises: S4.1, selecting the days of a stability observation period, respectively acquiring stress fluctuation of a reference strand through a fiber grating sensor in at least three periods of each day in the observation period, acquiring linear fluctuation of the reference strand through a total station, and transmitting the stress fluctuation and the linear fluctuation of the reference strand to a central control module; s4.2, in the data processing module, respectively comparing the stress fluctuation and the linear fluctuation of the reference cable strand with a preset threshold value to obtain a comparison result, wherein the preset threshold value is that the linear fluctuation is less than or equal to 1 millimeter and the stress fluctuation is less than or equal to 2 megapascals; And S4.3, when the comparison result shows that the linear fluctuation and the stress fluctuation are lower than the preset threshold value, executing the step S5, otherwise, executing the step S3 again.
7. The method according to claim 1, wherein in step S5, after each 10 conventional strands are erected in the traction erection process, the position of two reference strands is rechecked, and the total station and demodulator are used to re-measure the alignment and stress data and correspondingly adjust the two reference strands.
8. A suspension bridge main cable erection system for realizing the suspension bridge main cable erection method according to any one of claims 1 to 7, which is characterized by comprising a central control module, a display module, a plurality of cable strand position restraining frames, a traction device, a total station, a demodulator, a reflecting prism, two reference cable strands and a plurality of conventional cable strands; The strand suppression frame is fixed on the catwalk and is used for installing a reference strand and a conventional strand; the traction device comprises a winch and a supporting roller, wherein the winch and the supporting roller are arranged on the catwalk and are used for traction of a standard strand and a conventional strand; The fiber bragg grating sensor is integrated in the reference cable strand, and the reference cable strand is in communication connection with the demodulator and is used for monitoring stress data in the reference cable strand in real time and transmitting the stress data to the demodulator; the total station and the reflecting prism are used for acquiring linear data of the reference strand; The central control module is in communication connection with the display module, the demodulator and the total station, and is used for acquiring and comparing stress data and linear data of the reference cable strand.
9. The suspension bridge main cable strand erection system of claim 8, wherein the strand restraint frame is spliced from steel components and has a steel channel structure therein for mounting the reference strand and the conventional strand.
10. The suspension bridge main cable erection system of claim 9 wherein the steel channel structure has a non-slip protrusion therein.

Description

Suspension bridge main cable erection method and system Technical Field The invention belongs to the technical field of suspension bridge construction, and particularly relates to a method and a system for erecting a main cable strand of a suspension bridge. Background The main cable of the suspension bridge is used as a core bearing member of the bridge, and the positioning accuracy of the erection of the cable strand directly determines the overall stress balance and operation safety of the bridge. In suspension bridge construction, the main cable is composed of a plurality of strands, and a reference strand is used as a first erected strand to provide a positioning reference for other conventional strands. In the traditional main cable erection method, the positioning is generally carried out only by relying on a single reference cable, but along with the continuous increase of the span of a suspension bridge and the diameter of a main cable exceeding 1 meter, the positioning coverage range of the single reference cable is limited, the installation freedom degree of the lower half cable of the large-diameter main cable cannot be effectively restrained, meanwhile, the reference is monitored only by adopting single-point monitoring in the prior art, a real-time monitoring means for the internal stress of the reference cable is lacking, the linear fluctuation or the stress fluctuation of the reference cable cannot be found in time, and the erection deviation of the conventional cable easily exceeds a standard threshold value in the main cable erection process, so that the safety hazards such as local stress concentration and later creep deformation of the main cable are caused. Disclosure of Invention In order to solve the technical problems that in the background art, in the process of erecting a main cable, the erection deviation of a conventional cable strand easily exceeds a standard threshold value, and potential safety hazards such as local stress concentration, later creep deformation and the like of the main cable are caused, the invention provides a method and a system for erecting the main cable strand of a suspension bridge. In order to achieve the above purpose, the present invention adopts the following technical scheme: in a first aspect, the present invention provides a method of erecting a main cable strand of a suspension bridge, comprising: s1, installing cable strand position suppression frames, namely fixedly installing a plurality of cable strand position suppression frames on a catwalk according to main cable design parameters, so that the plurality of cable strand position suppression frames are equidistantly installed on the catwalk; S2, installing reference cable strands, namely pulling two reference cable strands to enable the two reference cable strands to be sequentially installed on all the position suppression frames and symmetrically arranged on the lower half part of the design section of the main cable, wherein an optical fiber grating sensor is integrated in each reference cable strand and used for monitoring stress data of the reference cable strands in real time; S3, reference cable strand shape adjustment, namely respectively carrying out linear detection on the two reference cable strands to obtain linear data, and carrying out linear adjustment on the two reference cable strands based on the linear data to enable the two reference cable strands to be in a designed linear condition; S4, carrying out stability observation on the reference cable strand, acquiring stress fluctuation of the reference cable strand through a fiber grating sensor in the process of stability observation, acquiring linear fluctuation of the reference cable strand through a total station, judging that the reference cable strand is in a stable state when the linear fluctuation and the stress fluctuation are both lower than a preset threshold value, and executing the step S5, otherwise, re-executing the step S3; And S5, conventional strand erection, namely traction erection of conventional strands by taking two reference strands as references, so that the conventional strands are arranged on all strand position restraining frames, and in the traction erection process, position rechecking is carried out on the two reference strands regularly until the traction erection operation of all conventional strands is completed. Optionally, the step S1 includes: s1.1, selecting the installation interval between cable strand position suppression frames according to the design span of a main cable; S1.2, according to the installation interval between the strand restraining frames, the strand restraining frames are fixedly installed on the cross beam at the bottom of the catwalk by bolts in sequence. Optionally, the step S2 includes: s2.1, respectively utilizing a winch to pull the reference cable strands on the supporting rollers, so that the two reference cable strands are respectively pulled into position; S