CN107907167B - Safety monitoring method and system for bridge cable hoisting device - Google Patents
Safety monitoring method and system for bridge cable hoisting device Download PDFInfo
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- CN107907167B CN107907167B CN201810011311.6A CN201810011311A CN107907167B CN 107907167 B CN107907167 B CN 107907167B CN 201810011311 A CN201810011311 A CN 201810011311A CN 107907167 B CN107907167 B CN 107907167B
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Abstract
The application discloses a safety monitoring method and system for a bridge cable hoisting device, and relates to the technical field of bridge construction and monitoring. The system comprises: the monitoring equipment comprises an inclinometer set, an acceleration sensor, a cable force sensor set, a wind speed and direction sensor and a strain gauge set. The method is realized based on a data processing method installed on the monitoring terminal; according to the data processing method, whether the bridge cable hoisting device monitored by each monitoring device is at risk or not is judged by directly comparing the real-time monitoring data of each monitoring device with a preset threshold value and/or comparing an analysis processing result obtained after the real-time monitoring data is analyzed and processed with a preset analysis result threshold value, and a risk prompt message is sent out. The application aims at the safety monitoring method of the system for forming the lifting heavy object lifting posture, the stress of the cable tower structure and the stress of the cable tower main cable ground anchor, and solves the construction safety problem caused by multiple risk sources in the cable crane construction process.
Description
Technical Field
The application relates to the technical field of bridge construction and safety guarantee monitoring of large temporary structures for bridge construction, in particular to a safety monitoring method and system of a bridge cable hoisting device.
Background
The cable hoisting method is one of the main methods for realizing self-erection construction of the large-span arch bridge, and is applied to an environment field with complex terrain conditions, such as a river section with canyons or water depth emergency, and a navigation river which needs to meet the smooth passing of ships. Although the construction process of the cable hoisting method is mature, the hoisting capacity of the cable crane is limited as the span of the steel pipe arch bridge is increased, and the construction safety problem of the cable hoisting method is increasingly remarkable. The research direction of the prior hoisting technology mainly aims at a large-structure independent integral hoisting construction method, a hoisting part hoisting gesture control method and a multi-crane cooperative hoisting method, and does not have research on how to realize safety monitoring of a cable hoisting system and monitoring of a hoisting operation environment field.
Disclosure of Invention
The application aims to provide a safety monitoring method and system for a bridge cable hoisting device, so as to solve the problems in the prior art.
In order to achieve the above purpose, the safety monitoring system of the bridge cable hoisting device comprises a cable tower and a main cable connected with the cable tower, wherein the cable tower comprises a hoisting tower and a buckling tower; the system comprises: the monitoring device comprises an inclinometer set, an acceleration sensor, a cable force sensor set, a wind speed and direction sensor and a strain gauge set; the inclinometer group comprises an inclinometer arranged on the crane tower, an inclinometer arranged on the buckling tower and an inclinometer arranged on the arch rib section; the cable sensor group comprises a cable sensor arranged on a main cable, a cable sensor arranged on a buckling cable connected with the crane tower, a cable sensor arranged on a buckling cable connected with the buckling tower and a cable sensor arranged on a back cable of the bridge cable hoisting device; the wind speed and direction sensor is arranged on the cable tower; the acceleration sensor is arranged on the arch rib section; the strain gauge set includes a strain gauge disposed at the ground anchor and a strain gauge disposed on the bottom of the cable tower.
Preferably, a bidirectional inclinometer is arranged in the middle of the arch rib section, and a three-way acceleration sensor is arranged in the middle of the arch rib section; the two side uprights of the tower crane top are provided with inclinometers, and the two side uprights of the tower buckling top are provided with inclinometers; the cable force sensor arranged on the main cable is a magnetic flux cable force test sensor.
The application discloses a safety detection method based on a safety monitoring system of a bridge cable hoisting device, which is realized based on a data processing method installed on a monitoring terminal;
the data processing method is realized by the following steps: acquiring real-time monitoring data of each monitoring device connected with the monitoring terminal in the construction process of hoisting the arch rib section through the monitoring terminal, directly comparing the real-time monitoring data with a preset threshold value and/or comparing an analysis processing result obtained after the real-time monitoring data is analyzed and processed with a preset analysis result threshold value, judging whether a bridge cable hoisting device monitored by each monitoring device has risks or not, and if so, sending out a prompt message; if not, continuing to judge.
Preferably, the monitoring of the states of the buckling towers is specifically: the two side uprights at the top of the tower are provided with tower buckling inclinometers, and the state of the tower buckling is judged according to the inclination angles obtained from the two tower buckling inclinometers in real time:
acquiring inclination angles monitored by two buckling tower inclinometers in real time, and acquiring displacement deviation of the buckling tower top according to a formula (2);
when theta is as j Not less than 5 DEG or max { L 1 /L 2 ，L 2 /L 1 The construction method comprises the steps that (1) the buckling tower is in a high risk state in the current construction operation process, and immediately sends out a prompt for stopping construction and evacuating a dangerous area by constructors;
when the angle is less than or equal to 3 DEGθ j Less than 5 DEG or 1 ∈max { L 1 /L 2 ，L 2 /L 1 The method comprises the steps that (1) a buckling tower is in a moderate risk state in the current construction operation process, and a prompt for requesting constructors to verify the stress state of the buckling tower is sent;
when theta is as j < 3 DEG and max { L 1 /L 2 ，L 2 /L 1 The number of the buckling towers is less than 1, the buckling towers are in an allowable state in the construction operation process, and no alarm is sent out;
L j representing displacement deviation of the tower top of the buckling tower side upright post j, wherein H represents the height of the buckling tower and theta j Represents the tilt angle monitored by the buckling tower inclinometer j, j represents the side column number of the buckling tower, and j=1 or j=2.
More preferably, the monitoring of the crane status is in particular: a crane inclinometer is arranged on two side uprights at the top of the crane tower, and the state of the crane is judged according to the inclination angles obtained from the two crane inclinometers in real time:
acquiring the tilt angles monitored by two crane inclinometers in real time, and acquiring the displacement offset of the top of the crane according to the formula (1);
when theta is as i ' is more than or equal to 10 DEG or max { L ] 1 ′/L 2 ′，L 2 ′/L 1 When the' } is more than or equal to 2, the crane tower is in a high risk state in the current construction operation process, and immediately sends out a prompt for stopping construction and evacuating a dangerous area by constructors;
when the angle is less than or equal to 5 DEG theta i ' < 10 DEG or 1 < max { L ] 1 ′/L 2 ′，L 2 ′/L 1 When the' } is less than 2, the crane is in a moderate risk state in the current construction operation process, and a prompt for requesting constructors to verify the stress state of the crane is sent;
when θ' < 5 DEG and max { L 1 ′/L 2 ′，L 2 ′/L 1 When the' } is less than 1, the crane is in an allowable state in the construction operation process, and no alarm is sent out;
L i ' representing displacement bias of tower crane side column i topBit, H' represents the height of the crane, L j Representing the displacement deviation of the tower top of the buckling tower side upright post j, theta i ' represents the tilt angle monitored by the crane inclinometer i, i represents the side column number of the crane, i=1 or i=2, j=1 or j=2.
Preferably, the monitoring of the rib segments during construction includes monitoring based on rib segment roll angle and pitch angle and monitoring based on rib segment acceleration values;
based on the monitoring of arch rib section roll angle and pitch angle, specifically do: a bidirectional inclinometer for monitoring the rolling angle and the pitch angle is arranged in the middle of the arch rib section, and the state of the arch rib section is judged according to the inclination angle value obtained from the bidirectional inclinometer in real time; in the construction operation process of the arch rib section, when the acquired real-time rolling angle and real-time pitch angle are both more than or equal to 3 degrees, the arch rib section is in a dangerous state in the construction operation process, a high risk alarm is sent out, and meanwhile, a prompt message for stopping hoisting immediately is sent out; when the obtained real-time rolling angle and real-time pitch angle are smaller than 3 degrees in the construction operation process of the arch rib section, the arch rib section is in an allowable state in the construction operation process, and no alarm is sent out;
based on the monitoring of arch rib segment acceleration value, specifically: a three-way acceleration sensor is arranged in the middle of the arch rib section, and the state of the arch rib section is judged according to the acceleration value obtained from the three-way acceleration sensor in real time: acquiring acceleration values from the moment of hoisting the arch rib section to the moment of the current moment, forming a set by all the acquired acceleration values, judging whether the acceleration values at the current moment are obvious in the set, if so, the arch rib section is affected by disturbance of the construction environment in the hoisting process and/or the horizontal movement process, and immediately sending a prompt for stopping hoisting construction operation when the arch rib section is in a high risk state at the current moment; if not, the state of the arch rib section at the current moment is the allowed state in the construction operation process, is a low-level risk, and does not give an alarm.
Preferably, monitoring each ground anchor of the bridge cable hoisting device in the construction operation process is specifically as follows: the strain gauge is arranged in each ground anchor, and the state of the ground anchor monitored by the strain gauge is judged according to the real-time stress value monitored by the strain gauge, specifically:
the method comprises the steps of obtaining stress values of a ground anchor at each moment from the beginning of hoisting construction operation to the current moment, calculating to obtain a stress average value, and calculating the real-time stress value of a strain gauge and the stress variation amplitude value of the stress average value;
when the stress change amplitude is more than or equal to 50% of the design allowable value of the ground anchor, the safety coefficient of the ground anchor is less than 2, and the ground anchor is in a high risk state, an prompt of immediate shutdown is sent out;
when the stress variation amplitude value of the ground anchor design allowable value is less than or equal to 20 percent and less than 50 percent of the ground anchor design allowable value, the ground anchor is in a moderate risk state, and in the hoisting operation process, an unbalanced load or unreasonable stress state exists, and a prompt for requesting constructors to verify and adjust the ground anchor is sent;
when the stress change amplitude is less than 20% of the design allowable value of the ground anchor, the ground anchor is in a normal construction state.
Preferably, the monitoring of the cable tower in the bridge cable hoisting device comprises: monitoring cable force stress on the front side and the rear side of the cable tower and monitoring unbalanced load stress state of the cable tower;
the cable force stress monitoring of the front side and the rear side of the cable tower is specifically as follows: the method comprises the steps of acquiring a cable force value group i in real time from a cable force sensor group i on a buckling cable connected with a crane tower, acquiring a cable force value group ii in real time from a cable force sensor group ii on a buckling cable connected with the crane tower, and acquiring a cable force value group iii in real time from a cable force sensor group iii on a back cable, wherein the distinguishing method comprises the following steps:
each cable force value group comprises two cable force values, the two cable force values are respectively obtained by monitoring two cable force sensors, the first cable force sensor monitors the cable force value of the position A, the second cable force sensor monitors the cable force value of the position B, the position A and the position B are respectively arranged on the stay cables of the stand columns at the two sides of the cable tower, and the position A and the position B are symmetrically arranged;
let one of the cable force value sets be delta 1 Another cable force value is delta 2 ；
When max { Δδ 1 /Δδ 2 ，Δδ 2 /Δδ 1 When the cable tension is more than or equal to 10, the unbalance of the cable tension on the front side and the rear side of the cable tower is obvious in the current construction operation process, the cable tower is in a high risk state, the construction is immediately stopped, and a prompt for requesting constructors to adjust the cable tension is sent;
when 5 is less than or equal to max { delta 1 /Δδ 2 ，Δδ 2 /Δδ 1 When the cable tension is less than 10, in the current construction operation process, unbalanced load exists on the cable tension stress of the front side and the rear side of the cable tower, the cable tower is in a moderate risk state, and a prompt of continuously paying attention to cable tension change is sent out;
when max { Δδ 1 /Δδ 2 ，Δδ 2 /Δδ 1 When the cable force is less than 5, the cable force on the front side and the rear side of the cable tower are balanced in the current construction operation process, and the cable tower is in a normal state;
the monitoring of the unbalanced load stress state of the cable tower is specifically as follows: the strain gauges are respectively arranged at the bottom of a left tower column and the bottom of a right tower column of the cable tower buckle tower, and the unbalanced load stressed state of the cable tower is judged according to the real-time monitoring value of the strain gauges:
acquiring a tower column stress value of the left tower column in real time and recording the tower column stress value as delta epsilon 1 The tower column stress value of the right tower column is obtained in real time and recorded as delta epsilon 2 ，
When max { Δε 1 /Δε 2 ，Δε 2 /Δε 1 When the number of the construction steps is more than or equal to 3, in the current construction operation process, the cable tower is in a high risk state, and a prompt for stopping the construction operation immediately and asking constructors to withdraw from a dangerous area is sent, and meanwhile, a prompt for asking corresponding personnel to find out the reason of the unbalanced load is sent;
when 1 is less than or equal to max { delta epsilon ] 1 /Δε 2 ，Δε 2 /Δε 1 When the stress of the left tower column and the right tower column of the cable tower is unbalanced, the cable tower is in a moderate risk state, corresponding personnel are prompted to find out the problem of unbalanced load stress in time, and after a feedback message after the problem is solved is received, a construction continuing prompt is sent;
when max { Δε 1 /Δε 2 ，Δε 2 /Δε 1 When the stress of the left tower column and the right tower column of the cable tower is consistent in the current construction operation process,the cable tower is in a normal state.
Preferably, the monitoring of the state of the wind environment field of the construction area is specifically: a wind speed and direction sensor is arranged at the top of the cable tower, and the state of a wind environment field of a construction area is judged according to the wind speed and direction sensor:
calculating to obtain the wind power at the current moment according to the wind speed value and the wind power value obtained in real time from the wind speed and direction sensor;
when the wind power is greater than 6 levels of wind, in the current construction operation process, the state of the wind environment field of the construction area is in a high risk state, and a prompt for stopping the hoisting operation of the arch rib sections and asking constructors to withdraw from a dangerous operation area is sent out;
when the wind power is less than or equal to 6-level wind, in the current construction operation process, the state of the wind environment field of the construction area is in a working state, and meanwhile, a prompt for setting windproof measures is sent to high-altitude operators.
Preferably, the cable force change of the main cable is monitored, specifically: the method comprises the steps that a magnetic flux cable force test sensor is arranged on a main cable, and the state of the main cable is judged according to implementation monitoring data of the magnetic flux cable force test sensor:
when the implementation monitoring data is larger than or equal to a preset cable force threshold value, at the current moment, the main cable is in an abnormal working state, and an alarm is sent out;
when the implementation monitoring data is smaller than a preset cable force threshold value, the main cable is in a normal working state at the current moment.
The beneficial effects of the application are as follows:
the safety monitoring method of the bridge cable hoisting system is used for safety monitoring of temporary structures in the cable hoisting construction process in the bridge construction period. The method provided by the application is used for monitoring the hoisting posture of the hoisting weight, monitoring the stress of a cable tower structure in a cable crane system under different working conditions, and monitoring the stress of a main cable anchor of the cable tower, so that a system safety monitoring method is formed, and the construction safety problem caused by multiple risk sources in the cable crane construction process is solved.
Drawings
FIG. 1 is a schematic diagram of a bridge cable hoist safety monitoring system;
fig. 2 is a schematic illustration of a bridge cable hoist apparatus hoisting rib segments.
Detailed Description
The present application will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the detailed description is presented by way of example only and is not intended to limit the application.
The cable hoisting system is used as a large temporary structure in the construction period of the steel pipe arch bridge, the reliability of the cable hoisting system directly determines the safety of main engineering, and the construction safety of the cable hoisting system is directly affected by swinging of hoisting steel pipe sections caused by overlarge wind power in a construction operation environment, overturning caused by uneven stress of a cable tower, main cable safety problems caused by overlarge stress of a ground anchor and the like. The application provides a multi-index comprehensive monitoring method aiming at the environmental wind field, the hoisting posture of a steel pipe arch rib section, the stress balance and deviation of a cable tower, the main cable force, the ground anchor stress, the buckling cable force balance and the like in the cable hoisting process, and the working and running states of potential risk sources at each part of a cable hoisting system are mastered, so that the safety control under the coupling effect of multiple risk sources in the construction process is realized, and the safety of personnel and the integrity of equipment are ensured. The effect of the safety monitoring method of the bridge cable hoisting system is described in detail by the embodiment.
Examples
The cable crane safety monitoring is realized by:
(1) The main cable is a bearing member of the whole bridge cable hoisting device, the cable force difference of the main cable under different hoisting working conditions is large, and a magnetic flux cable force test sensor is arranged on the main cable to monitor the cable force change state in the hoisting process in real time.
(2) Wind speed, wind pressure and wind direction sensors are arranged at the top of the cable tower, the characteristics of the environmental wind field of the operation area are mastered, the influence of environmental disturbance on the hoisting area of the segmental steel pipe arch rib is known, and the hoisting operation is stopped by more than six stages of strong winds.
(3) The cable tower is divided into a buckling tower and a hanging tower, wherein the buckling tower is arranged at the lower part, the hanging tower is arranged at the upper part, two displacement measuring points are transversely arranged at the top part of the buckling tower (the connecting part with the hanging tower), and the cooperativity of deformation at two sides of the cable tower is monitored.
(4) Strain gauges are arranged around the truss structure at the lower part of the buckling tower and used for monitoring the balance of the stress of the upright posts at the two sides of the buckling tower, and the stress of the cable tower is prevented from being obviously unbalanced in the hoisting process.
(5) The hoisting of the arch rib segments to be hoisted is usually limited by a field, and single hoisting tool is adopted to hoist, so that plane rotation is completed, and double hoisting tools are converted to hoist and assemble in place. The application arranges a bidirectional inclinometer and an acceleration sensor on the arch rib section to be hoisted; the acceleration sensor is used for monitoring whether the arch rib section to be hoisted is uniform in the hoisting process; the bidirectional inclinometer is used for monitoring the rolling angle and the pitch angle of the arch rib section to be hoisted in the process of turning in the air and the process of hoisting in place, so that the hoisting gesture of the arch rib section to be hoisted is ensured to be within a specified limit range.
(6) The construction quality and the stress state of the ground anchor determine whether the main cable can work normally, strain gauges are arranged at the ground anchor, the stress state under the anchor is monitored, and the structural safety of the ground anchor member is ensured.
(7) The cable force of symmetrical positions of tower columns (hanging towers and buckling towers) at two sides of the cable tower under each construction working condition is monitored through a cable force meter, and the cable force of a back cable at the symmetrical position of the cable tower is monitored to compare and analyze whether the stress of the cable tower is balanced.
(8) Description about each monitoring device and monitoring terminal in this embodiment: the monitoring terminal is in wireless connection with the monitoring equipment. The monitoring terminal comprises one or more of a notebook computer, a tablet computer and a smart phone.
The monitoring indexes and threshold values of each monitoring device set in the application are as follows (the serial numbers of the monitoring indexes correspond to fig. 1):
by adopting the technical scheme disclosed by the application, the following beneficial effects are obtained: the application realizes the comprehensive monitoring and evaluation of multiple risk sources in the cable hoisting process, and the existing monitoring means and products monitor multiple single risk indexes. The cable hoisting system is used as a complex large-scale temporary construction structure, and has no comprehensive safety monitoring method, the important risk points in the cable hoisting process are extracted, and the monitoring indexes and the early warning threshold values are respectively set from the bearing structure, the force transmission structure and the foundation structure, so that the safety monitoring of dangerous behaviors in the construction process is realized, and the overall management and control of risks by construction managers are facilitated.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application, which is also intended to be covered by the present application.
Claims (7)
1. A safety monitoring system for a bridge cable hoist device, the bridge cable hoist device comprising a cable tower and a main cable connected to the cable tower, the cable tower comprising a hoist tower and a buckling tower, the system comprising: the monitoring device comprises an inclinometer set, an acceleration sensor, a cable force sensor set, a wind speed and direction sensor and a strain gauge set;
the inclinometer group comprises an inclinometer arranged on the crane tower, an inclinometer arranged on the buckling tower and an inclinometer arranged on the arch rib section;
the cable sensor group comprises a cable sensor arranged on a main cable, a cable sensor arranged on a buckling cable connected with the crane tower, a cable sensor arranged on a buckling cable connected with the buckling tower and a cable sensor arranged on a back cable of the bridge cable hoisting device;
the wind speed and direction sensor is arranged on the cable tower;
the acceleration sensor is arranged on the arch rib section;
the strain gauge group comprises strain gauges arranged at the ground anchors and strain gauges arranged on the bottoms of the cable towers;
the safety monitoring system realizes safety monitoring of the bridge cable hoisting device by adopting a safety monitoring method, and the safety monitoring method is realized based on a data processing method installed on the monitoring terminal:
the data processing method is realized by the following steps: acquiring real-time monitoring data of each monitoring device connected with the monitoring terminal in the construction process of hoisting the arch rib section through the monitoring terminal, directly comparing the real-time monitoring data with a preset threshold value and/or comparing an analysis processing result obtained after the real-time monitoring data is analyzed and processed with a preset analysis result threshold value, judging whether a bridge cable hoisting device monitored by each monitoring device has risks or not, and if so, sending out a prompt message; if not, continuing to judge;
the monitoring of the buckling tower state specifically comprises the following steps: the two side uprights at the top of the tower are provided with tower buckling inclinometers, and the state of the tower buckling is judged according to the inclination angles obtained from the two tower buckling inclinometers in real time:
acquiring inclination angles monitored by two buckling tower inclinometers in real time, and acquiring displacement deviation of the buckling tower top according to a formula (2);
when theta is as j Not less than 5 DEG or max { L 1 /L 2 ，L 2 /L 1 The buckling tower is in a high risk state in the current construction operation process and is more than or equal to 2, and the buckling tower is immediately in a high risk stateSending a prompt for stopping construction and evacuating a dangerous area by constructors;
when the angle is less than or equal to 3 DEG theta j <5 DEG or 1.ltoreq.max { L 1 /L 2 ，L 2 /L 1 }<2, the buckling tower is in a moderate risk state in the current construction operation process, and a prompt for requesting constructors to verify the stress state of the buckling tower is sent;
when theta is as j <3 DEG and max { L 1 /L 2 ，L 2 /L 1 }<1, the buckling tower is in an allowed state in the construction operation process, and no alarm is sent out;
L j representing displacement deviation of the tower top of the buckling tower side upright post j, wherein H represents the height of the buckling tower and theta j Representing the inclination angle monitored by a buckling tower inclinometer j, wherein j represents the side column number of the buckling tower, and j=1 or j=2;
monitoring a cable tower in a bridge cable hoisting device comprises the following steps: monitoring cable force stress on the front side and the rear side of the cable tower and monitoring unbalanced load stress state of the cable tower;
the cable force stress monitoring of the front side and the rear side of the cable tower is specifically as follows: the method comprises the steps of acquiring a cable force value group i in real time from a cable force sensor group i on a buckling cable connected with a crane tower, acquiring a cable force value group ii in real time from a cable force sensor group ii on a buckling cable connected with the crane tower, and acquiring a cable force value group iii in real time from a cable force sensor group iii on a back cable, wherein the distinguishing method comprises the following steps:
each cable force value group comprises two cable force values, the two cable force values are respectively obtained by monitoring two cable force sensors, the first cable force sensor monitors the cable force value of the position A, the second cable force sensor monitors the cable force value of the position B, the position A and the position B are respectively arranged on the stay cables of the stand columns at the two sides of the cable tower, and the position A and the position B are symmetrically arranged;
let one of the cable force value sets be delta 1 Another cable force value is delta 2 ；
When max { Δδ 1 /Δδ 2 ，Δδ 2 /Δδ 1 When the number of the cable force is more than or equal to 10, in the current construction operation process, the unbalance of the cable force stress at the front side and the rear side of the cable tower is obvious, the cable tower is in a high risk state, the construction is immediately stopped, and a constructor is required to adjustPrompting the whole cable force;
when 5 is less than or equal to max { delta 1 /Δδ 2 ，Δδ 2 /Δδ 1 }<10, in the current construction operation process, unbalanced load exists on cable force stress on the front side and the rear side of the cable tower, the cable tower is in a moderate risk state, and a prompt of continuously paying attention to cable force change is sent out;
when max { Δδ 1 /Δδ 2 ，Δδ 2 /Δδ 1 }<5, in the current construction operation process, the cable force on the front side and the rear side of the cable tower are balanced, and the cable tower is in a normal state;
the monitoring of the unbalanced load stress state of the cable tower is specifically as follows: the strain gauges are respectively arranged at the bottom of a left tower column and the bottom of a right tower column of the cable tower buckle tower, and the unbalanced load stressed state of the cable tower is judged according to the real-time monitoring value of the strain gauges:
acquiring a tower column stress value of the left tower column in real time and recording the tower column stress value as delta epsilon 1 The tower column stress value of the right tower column is obtained in real time and recorded as delta epsilon 2 ，
When max { Δε 1 /Δε 2 ，Δε 2 /Δε 1 When the number of the construction steps is more than or equal to 3, in the current construction operation process, the cable tower is in a high risk state, and a prompt for stopping the construction operation immediately and asking constructors to withdraw from a dangerous area is sent, and meanwhile, a prompt for asking corresponding personnel to find out the reason of the unbalanced load is sent;
when 1 is less than or equal to max { delta epsilon ] 1 /Δε 2 ，Δε 2 /Δε 1 }<3, when the stress of the left tower column and the right tower column of the cable tower is unbalanced, the cable tower is in a moderate risk state, corresponding personnel are prompted to find out the problem of unbalanced load stress in time, and after a feedback message after the problem is solved is received, a construction continuing prompt is sent out;
when max { Δε 1 /Δε 2 ，Δε 2 /Δε 1 }<1, in the current construction operation process, the left tower column and the right tower column of the cable tower are stressed consistently, and the cable tower is in a normal state.
2. A safety monitoring system for a bridge cable hoist according to claim 1,
the middle of each arch rib section is provided with a bidirectional inclinometer, and the middle of each arch rib section is provided with a three-way acceleration sensor;
the two side uprights of the tower crane top are provided with inclinometers, and the two side uprights of the tower buckling top are provided with inclinometers;
the cable force sensor arranged on the main cable is a magnetic flux cable force test sensor.
3. The safety monitoring system of a bridge cable hoisting device according to claim 1, wherein the monitoring of the crane status is specifically: a crane inclinometer is arranged on two side uprights at the top of the crane tower, and the state of the crane is judged according to the inclination angles obtained from the two crane inclinometers in real time:
acquiring the tilt angles monitored by two crane inclinometers in real time, and acquiring the displacement offset of the top of the crane according to the formula (1);
when theta is as i ' is more than or equal to 10 DEG or max { L ] 1 ′/L 2 ′，L 2 ′/L 1 When the' } is more than or equal to 2, the crane tower is in a high risk state in the current construction operation process, and immediately sends out a prompt for stopping construction and evacuating a dangerous area by constructors;
when the angle is less than or equal to 5 DEG theta i ′<10 DEG or 1.ltoreq.max { L 1 ′/L 2 ′，L 2 ′/L 1 ′}<2, when the crane is in a moderate risk state in the current construction operation process, sending a prompt for requesting constructors to verify the stress state of the crane;
when theta'.<5 DEG and max { L 1 ′/L 2 ′，L 2 ′/L 1 ′}<1, the crane tower is in an allowed state in the construction operation process, and no alarm is sent out;
L i 'represents displacement offset of tower crane side column i tower top, H' represents height of tower crane, L j Representing the displacement deviation of the tower top of the buckling tower side upright post j, theta i ' representationThe inclination angle monitored by the crane inclinometer i, i represents the side column number of the crane, i=1 or i=2, j=1 or j=2.
4. The safety monitoring system of a bridge cable hoist of claim 1, wherein monitoring of rib segments during construction includes monitoring based on rib segment roll angle and pitch angle and monitoring based on rib segment acceleration values;
based on the monitoring of arch rib section roll angle and pitch angle, specifically do: a bidirectional inclinometer for monitoring the rolling angle and the pitch angle is arranged in the middle of the arch rib section, and the state of the arch rib section is judged according to the inclination angle value obtained from the bidirectional inclinometer in real time; in the construction operation process of the arch rib section, when the acquired real-time rolling angle and real-time pitch angle are both more than or equal to 3 degrees, the arch rib section is in a dangerous state in the construction operation process, a high risk alarm is sent out, and meanwhile, a prompt message for stopping hoisting immediately is sent out; when the obtained real-time rolling angle and real-time pitch angle are smaller than 3 degrees in the construction operation process of the arch rib section, the arch rib section is in an allowable state in the construction operation process, and no alarm is sent out;
based on the monitoring of arch rib segment acceleration value, specifically: a three-way acceleration sensor is arranged in the middle of the arch rib section, and the state of the arch rib section is judged according to the acceleration value obtained from the three-way acceleration sensor in real time: acquiring acceleration values from the moment of hoisting the arch rib section to the moment of the current moment, forming a set by all the acquired acceleration values, judging whether the acceleration values at the current moment are obvious in the set, if so, the arch rib section is affected by disturbance of the construction environment in the hoisting process and/or the horizontal movement process, and immediately sending a prompt for stopping hoisting construction operation when the arch rib section is in a high risk state at the current moment; if not, the state of the arch rib section at the current moment is the allowed state in the construction operation process, is a low-level risk, and does not give an alarm.
5. The safety monitoring system of a bridge cable hoisting device according to claim 1, wherein the monitoring of each ground anchor of the bridge cable hoisting device during construction operation is specifically: the strain gauge is arranged in each ground anchor, and the state of the ground anchor monitored by the strain gauge is judged according to the real-time stress value monitored by the strain gauge, specifically:
the method comprises the steps of obtaining stress values of a ground anchor at each moment from the beginning of hoisting construction operation to the current moment, calculating to obtain a stress average value, and calculating the real-time stress value of a strain gauge and the stress variation amplitude value of the stress average value;
when the stress change amplitude is more than or equal to 50% of the design allowable value of the ground anchor, the safety coefficient of the ground anchor is less than 2, and the ground anchor is in a high risk state, an prompt of immediate shutdown is sent out;
when the stress variation amplitude value of the ground anchor design allowable value is less than or equal to 20 percent and less than 50 percent of the ground anchor design allowable value, the ground anchor is in a moderate risk state, and in the hoisting operation process, an unbalanced load or unreasonable stress state exists, and a prompt for requesting constructors to verify and adjust the ground anchor is sent;
when the stress change amplitude is less than 20% of the design allowable value of the ground anchor, the ground anchor is in a normal construction state.
6. The safety monitoring system of a bridge cable hoisting device according to claim 1, characterized in that the monitoring of the state of the wind environment field of the construction area is specifically: a wind speed and direction sensor is arranged at the top of the cable tower, and the state of a wind environment field of a construction area is judged according to the wind speed and direction sensor:
calculating to obtain the wind power at the current moment according to the wind speed value and the wind power value obtained in real time from the wind speed and direction sensor;
when the wind power is greater than 6 levels of wind, in the current construction operation process, the state of the wind environment field of the construction area is in a high risk state, and a prompt for stopping the hoisting operation of the arch rib sections and asking constructors to withdraw from a dangerous operation area is sent out;
when the wind power is less than or equal to 6-level wind, in the current construction operation process, the state of the wind environment field of the construction area is in a working state, and meanwhile, a prompt for setting windproof measures is sent to high-altitude operators.
7. The safety monitoring system of a bridge cable hoisting device according to claim 1, characterized in that the cable force change monitoring of the main cable is specifically: the method comprises the steps that a magnetic flux cable force test sensor is arranged on a main cable, and the state of the main cable is judged according to implementation monitoring data of the magnetic flux cable force test sensor:
when the implementation monitoring data is larger than or equal to a preset cable force threshold value, at the current moment, the main cable is in an abnormal working state, and an alarm is sent out;
when the implementation monitoring data is smaller than a preset cable force threshold value, the main cable is in a normal working state at the current moment.
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