CN-122015756-A - Suspension bridge suspender abnormity monitoring method based on main cable morphological variation

CN122015756ACN 122015756 ACN122015756 ACN 122015756ACN-122015756-A

Abstract

The invention relates to the technical field of suspension bridge suspension rod abnormity monitoring and discloses a suspension bridge suspension rod abnormity monitoring method based on main cable morphological variation, which comprises the following steps of S1, connecting main cable intersection points on two sides of one suspension rod of a suspension bridge in a straight line manner through auxiliary cables, S2, vertically arranging a displacement sensor at the main cable intersection point of the suspension bridge, connecting a magnetic ring with the auxiliary cables, S3, repeating S1-S2, connecting main cable intersection points on two sides of all suspension rods of the suspension bridge in a straight line manner through the auxiliary cables, vertically arranging the displacement sensor at the corresponding main cable intersection point of the suspension rod, connecting the magnetic ring with the auxiliary cables, and S4, connecting the first control module with the auxiliary cables Comparing the displacement data with the initial displacement, if the first The difference value between the secondary monitored displacement data and the initial displacement is larger than a preset first threshold value and is continuously 3-5 times, the first The difference value between the secondary monitored displacement data and the initial displacement is larger than a preset first threshold value, and the control module controls the alarm to send out an acousto-optic signal. The invention can accurately and rapidly monitor the abnormal suspender.

Inventors

ZHOU YIN
Huang Longhang
WANG CHUANDONG
Yan Lupeng
ZHANG HONG
WANG YUE
CHEN XUAN
ZHOU JIANTING
LIAO YUAN
TANG QIZHI
YANG JIPENG
YANG CHANGXI

Assignees

重庆交通大学
湖北省交通规划设计院股份有限公司
重庆市建设信息中心
重庆市九龙坡区建设事务中心

Dates

Publication Date: 20260512
Application Date: 20260210

Claims (8)

1. The suspension bridge suspender abnormality monitoring method based on the main cable morphological variation is characterized by comprising the following steps of: s1, connecting main cable intersection points on two sides of one suspender of a suspension bridge in a straight line through auxiliary cables; S2, a displacement sensor which is vertical to a horizontal plane and is used for monitoring the vertical linear distance between the hanger rod main cable intersection point and an auxiliary cable above the main cable intersection point is vertically arranged at the hanger rod main cable intersection point of the suspension bridge, and a magnetic ring on the displacement sensor is connected with the auxiliary cable right above the hanger rod main cable intersection point; s3, repeating the steps S1-S2, wherein the main cable intersection points on the two sides of all the suspenders of the suspension bridge are connected through auxiliary cables in a straight line, displacement sensors perpendicular to the horizontal plane are vertically arranged at the corresponding main cable intersection points of the suspenders, and a magnetic ring on each displacement sensor is connected with the auxiliary cable right above the main cable intersection point of the suspender; S4, transmitting the displacement data between the primary cable intersection point monitored for the first time and the auxiliary cable above the primary cable intersection point to a control module by all the displacement sensors, transmitting the monitored displacement data to the control module by the displacement sensors according to preset frequency as initial displacement, and transmitting the first time of displacement data by the control module Comparing the displacement data with the initial displacement, if the first The difference value between the secondary monitored displacement data and the initial displacement is larger than a preset first threshold value and is continuously 3-5 times, the first The difference value between the displacement data monitored for the second time and the initial displacement is larger than a preset first threshold value, and the control module controls the alarm to send out an acousto-optic signal and prompts the corresponding boom number.
2. The suspension bridge suspender abnormity monitoring method based on main cable morphological variation according to claim 1 is characterized in that in S4, when a first threshold value is 3% -5% of an initial displacement value, a first-stage early warning is started, sampling frequency is automatically increased, a corresponding suspender is marked as an important attention object, when the first threshold value is 5% -10% of the initial displacement value, a second-stage early warning is started, a control module triggers a yellow audible and visual alarm, a short message or mail push is sent to maintainers through a background, on-site manual inspection is needed in one working day, when the first threshold value is more than 10% of the initial displacement value, a third-stage early warning is started, a control module triggers a red rapid audible and visual warning, and detailed structural flaw detection is immediately organized.
3. The method for monitoring an abnormality of a suspension bridge boom based on a morphological variation of a main rope according to claim 1, wherein in S4, if the following is The displacement data of the intersection points of the main cables of three adjacent or more booms and the initial displacement are monitored to be larger than a preset first threshold value at the same time, and the change trend is consistent, so that local damage of the non-single booms is judged, regional abnormal mode reminding is triggered, if all the difference values are linearly and uniformly changed, the full-bridge temperature effect or overweight vehicle passing through the bridge is judged, the alarm is suspended, the load is retested after passing through, and if all the difference values are in regional uneven settlement, the main cable linear abnormality or the main beam abnormality is judged, and the highest-level full-bridge structure safety response is triggered.
4. The method for monitoring the abnormality of the suspension bridge suspension rod based on the morphological variation of the main rope according to claim 1, wherein in S4, the control module controls the received suspension bridge to make the intersection point of each suspension rod main rope And comparing the secondary monitored displacement data with initial displacement of the corresponding hanger rod main cable intersection point, and obtaining a relative displacement deformation diagram of each hanger rod main cable intersection point of the suspension bridge, wherein if the line in the diagram is M-shaped, the hanger rod damage is vertical damage, and the hanger rod corresponding to the inward bending position in the M-shaped line is the hanger rod with corresponding damage.
5. The method for monitoring the abnormality of the suspension bridge suspension rod based on the morphological variation of the main rope according to claim 1, wherein in S4, the control module controls the received suspension bridge to make the intersection point of each suspension rod main rope And comparing the secondary monitored displacement data with initial displacement of the intersection point of the main cable of the corresponding suspension rod, and obtaining a relative displacement deformation diagram of the intersection point of the main cable of each suspension rod of the suspension bridge, wherein if the line in the diagram is W-shaped, the damage of the suspension rod is transverse damage, and the corresponding abscissa at the outward bending position in the W-shaped line is the suspension rod with corresponding damage.
6. The method for monitoring the suspension bridge suspension rod abnormality based on the main cable morphological variation according to claim 4, wherein when the line in the main cable intersection point relative displacement variation graph is M-shaped, if the differences between the relative displacement of the main cable intersection point corresponding to one suspension rod and the relative displacement of the main cable intersection point corresponding to the suspension rod adjacent to the suspension rod are respectively smaller than a preset threshold value, the suspension rod is a damaged suspension rod, namely an M-shaped inward bending point, as shown in formulas (1) and (2), (1), (2), In the formulas (1) and (2), Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is a preset threshold.
7. The method for monitoring the suspension bridge suspender abnormality based on main cable morphological variation as claimed in claim 5, wherein when the line in the main cable intersection point relative displacement variation graph is W-shaped, if the differences between the relative displacement of the main cable intersection point corresponding to one suspender and the relative displacement of the main cable intersection point corresponding to the suspender adjacent to the suspender are respectively larger than a preset threshold value, the suspender is a damaged suspender, namely a W-shaped outward bending point, as shown in formulas (3) and (4), (3), (4), In the formulas (3) and (4), Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is the first The corresponding main cable intersection point of the boom is relatively displaced, Is a preset threshold.
8. The method for monitoring the suspension bridge suspension rod abnormality based on the main cable morphological variation according to claim 1, wherein the displacement sensor is connected with the suspension bridge cable clamp through a first connecting component and is vertical to a horizontal plane through the first connecting component; The first connecting assembly comprises a first connecting plate and a first supporting piece used for placing the displacement sensor, the first supporting piece comprises a first supporting column, a universal joint, a second supporting column and a connecting disc, the first supporting column is connected with the first connecting plate, the universal joint, the second supporting column and the connecting disc are connected with the corresponding second connecting plates, the diameter of the first supporting column is larger than the width of the second connecting plate, the first supporting column and the second supporting column are connected through the universal joint, and the displacement sensor is detachably connected with the second supporting column through the connecting disc.

Description

Suspension bridge suspender abnormity monitoring method based on main cable morphological variation Technical Field The invention relates to the technical field of suspension bridge suspension rod abnormality monitoring, in particular to a suspension bridge suspension rod abnormality monitoring method based on main cable morphological variation. Background 2021, 3 Months, the office of the transportation department issues "construction implementation scheme of health monitoring System for Long and Long bridge structures of highway", including highway, municipal administration, track, railway suspension bridge, require 401 road bridges to install health monitoring System, and carry out routine detection and health monitoring on hundreds of long and long suspension bridges in the whole life cycle. The current mainstream boom abnormality monitoring method is mostly based on monitoring the boom itself directly, for example, measuring the boom force of a suspension bridge by a frequency method, and calculating the boom force according to a theoretical formula by actually measuring the self-vibration frequency of the boom. Although the frequency method is a common method of measuring the boom force, it has significant limitations. The method has extremely high requirement on the accuracy of input parameters, and is difficult to ensure the reliability because of the complicated structure and different lengths of the suspenders in the actual engineering, and is especially not applicable to short suspenders. Thus, there is still a lack of a method in the industry to monitor boom anomalies stably and reliably over the life of a bridge. Disclosure of Invention In order to overcome the defects of the prior art, the invention aims to provide the suspension bridge suspender abnormity monitoring method based on the main cable morphological variation, which can accurately and rapidly monitor the abnormal suspender, prevent maintenance in time, prolong the service life of the bridge and reduce the life cycle cost. The suspension bridge suspender abnormality monitoring method based on the main cable morphological variation comprises the following steps: s1, connecting main cable intersection points on two sides of one suspender of a suspension bridge in a straight line through auxiliary cables; S2, a displacement sensor which is vertical to a horizontal plane and is used for monitoring the vertical linear distance between the hanger rod main cable intersection point and an auxiliary cable above the main cable intersection point is vertically arranged at the hanger rod main cable intersection point of the suspension bridge, and a magnetic ring on the displacement sensor is connected with the auxiliary cable right above the hanger rod main cable intersection point; s3, repeating the steps S1-S2, wherein the main cable intersection points on the two sides of all the suspenders of the suspension bridge are connected through auxiliary cables in a straight line, displacement sensors perpendicular to the horizontal plane are vertically arranged at the corresponding main cable intersection points of the suspenders, and a magnetic ring on each displacement sensor is connected with the auxiliary cable right above the main cable intersection point of the suspender; S4, transmitting the displacement data between the primary cable intersection point monitored for the first time and the auxiliary cable above the primary cable intersection point to a control module by all the displacement sensors, transmitting the monitored displacement data to the control module by the displacement sensors according to preset frequency as initial displacement, and transmitting the first time of displacement data by the control module Comparing the displacement data with the initial displacement, if the firstThe difference value between the secondary monitored displacement data and the initial displacement is larger than a preset first threshold value and is continuously 3-5 times, the firstThe difference value between the displacement data monitored for the second time and the initial displacement is larger than a preset first threshold value, and the control module controls the alarm to send out an acousto-optic signal and prompts the corresponding boom number. In S4, when the first threshold is 3% -5% of the initial displacement value, a first-stage early warning is started, the sampling frequency is automatically increased, the corresponding suspender is marked as a focus object, when the first threshold is 5% -10% of the initial displacement value, a second-stage early warning is started, a control module triggers a yellow audible and visual alarm, a short message or mail push is sent to maintenance personnel through a background, on-site manual inspection is needed in one working day, when the first threshold is more than 10% of the initial displacement value, a third-stage early warning is started, a control module triggers a red rapid audible and v