KR101941945B1 - Apparatus and method for controling tensile stress of bridge girder based on big data - Google Patents

Abstract

The present invention relates to an apparatus and a method for controlling tension stress of an active bridge girder based on big data. The purpose of the present invention is to improve durability of a bridge girder by reducing tension stress of a bridge girder by applying tension through a tension material only when a load is increased due to an excessive load or an increase in traffic volume, while enduring a load by self-load carrying capacity of the bridge girder without tension stress of a tension material in the usual time. According to the present invention, the apparatus comprises: a database (10) which measures a load applied to a bridge girder and stores event information of an allowable load or more which requires a tension work among measurement values together with time information; a tension material (20) which is installed on the bridge girder in a tensile direction and reduces tension stress generated in the bridge girder; an actuator (30) which pulls at least one of both longitudinal sides of the tension material in a tension direction and makes tension or releases tension from a tension state to release tension stress; and a controller (40) which tensions the tension material through control of the actuator to reduce the tension stress of the bridge girder when current time information is matched with the time information of the event information after comparing the time information of the event information stored in the database with the current time information, and returns the tension material through control of the actuator when the time information of the event information passes. Therefore, the bridge girder is set on the basis of self-load carrying capacity of the bridge girder, and the bridge girder is tensioned when a load greater than or equal to an allowable load occurs in the bridge girder, and thus it is possible to reduce tension stress of the bridge girder.

Description

TECHNICAL FIELD [0001] The present invention relates to an active bridge type girder tensile stress control apparatus and method,

The present invention relates to a bridge girder tensile stress control apparatus, and more particularly, to a bridge girder tensile stress control apparatus for a bridge girder which improves the durability of a bridge girder by reducing the tensile stress of the bridge girder through tension only when necessary, And more particularly, to a data-based active bridge girder tensile stress control apparatus and method.

This section provides background information related to the subject matter of this application and is not necessarily prior art.

Bridge is a structure that can withstand a wide variety of dynamic loads as well as fixed loads during the life cycle. Most dynamic loads are theoretically secured within the design vehicle load by the vehicle load. However, in the case of overloaded vehicles or heavy traffic, There are occasions when they are adjacent or momentarily exceeded. These relatively large dynamic loads cause additional fatigue stresses in the bridges, which cause fatigue damage and are a major cause of reduced bridge life.

On the other hand, the external prestressing method which introduces external tensile force is introduced in order to effectively correct the deflection of the mold of the old bridge by the technique for improving the durability of the bridge. This method is a method of applying a compressive force to a bridge by tensioning tensile material (stranded wire) installed along the direction of the bridge's axis to give restoring force to offset the deflection generated at the center of the bridge by the action of the load, thereby effectively increasing the load- .

The technique of introducing external tensions such as patent documents is a method for reinforcing old bridges in which permanent load is generated by reducing the load-bearing capacity to less than design, so that the bridges are always taut by tensioning the tension members permanently, Control. In addition, the present invention can be applied not only to old bridges but also to normal bridges for the purpose of increasing the service life, and there is a difference in that the following problems arise when applying the existing external tensions to normal bridges.

When a normal bridge is tensed through an external tension member, the upper concrete deck generates tensile force and thus the packing portion is broken. In the case of concrete, the waterproof layer between the concrete bottom plate and the packing layer, which is a compression member, is damaged, There is a problem that maintenance cost is increased due to deterioration (neutralization, etc.) and the lifetime of the bridge is greatly reduced.

Patent No. 10-0357332 Patent No. 10-0554026

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a bridge girder which is capable of enduring a load by its own load without tension of a normal tension member and giving a tensile force through a tension member only when an excessive load, The present invention aims to provide a large data-based active bridge-girder tensile stress control apparatus and method that can reduce the tensile stress of a bridge-type bridge structure, and can perform simple and quick control without field sensing based on previously built big data.

A large data-based active bridge girder tensile stress control device according to the present invention comprises: a database for storing load information on a bridge girder and storing event information of an allowable load or the like that requires a tension operation among measured values together with time information; A tensile member installed in the tensile direction on the bridge girder and reducing a tensile stress generated in the bridge girder; An actuator for pulling at least one side of both sides in the longitudinal direction of the tensile material in a tension direction to release tension in a tensioned state; When the current time information matches the time information of the event information through comparing the time information of the event information stored in the database with the current time information, the tensile stress of the bridge girder is reduced by tightening the tensioner through the control of the actuator, And a controller for returning the tensioned material through the control of the actuator when the time information of the event information has elapsed. Accordingly, the load carrying capacity of the bridge girder is set as a default, and when the bridge load exceeds a permissible load, And tensioning the girder.

The controller includes a sensor for sensing the load of the bridge girder in real time, and the controller compares the current sensed value by the sensor with the reference value to control the tension of the bridge girder when the current sensed value is higher than the reference value .

According to the large data-based active bridge girder tensile stress control device according to the present invention, the load is restrained only by the bearing load of the bridge girder itself during normal operation, thereby preventing the damage of the pavement due to tension when there is no load, This is a method to predict the load through comparison of the big data constructed by measuring the load in various cases (date, time, etc.) where the load actually acts on the bridge girder, Thus, there is an effect of preventing the damage of the bridge from a load change due to an overload or an increase in traffic volume, and also an error caused by a malfunction of a sensor for sensing a load.

In the case of the second embodiment, by controlling the tension member based on the big data, the bridge girder is tensioned when necessary, and when a large load that can not be managed by the big data is detected, the bridge girder is tightened to improve the durability of the bridge There is an effect of improving.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a big data based active bridge girder tensile stress control device according to a first embodiment of the present invention; FIG.
Fig. 2 is an illustration of a data sheet according to a big data-based active bridge girder tensile stress control method according to a first embodiment of the present invention; Fig.
3 is a graph showing a load distribution on a weekday basis for a large data-based active bridge girder tensile stress control method according to Embodiment 1 of the present invention.
4 is a block diagram of a big data based active bridge girder tensile stress control device according to a second embodiment of the present invention.
5 is a graph showing an example of real-time load sensing for a large data-based active bridge girder tensile stress control method according to a second embodiment of the present invention.
6 is a view showing another installation position of a sensor applied to a big data based active bridge girder tensile stress control device according to a second embodiment of the present invention.
FIG. 7 is a plan view showing an example in which a tension material applied to a large data-based active bridge girder tensile stress control device according to the present invention is installed on both right and left sides.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

≪ Example 1 >

1, the big data-based active bridge type girder tensile stress control apparatus according to the present embodiment includes a database 10 for storing load-related big data acting on the bridge girder 1, a bridge girder 1 A controller 40 for controlling the operation of the actuator 30 based on the big data stored in the database 10, an actuator 30 for controlling the tension of the actuator 30 by pulling or loosening the tension member 20, ), The bridge girder 1 is maintained in a manufactured state under a constant load (i.e., a load that the bridge girder can withstand without additional tension), and only when a load equal to or greater than a predetermined load is applied, Thereby reducing the tensile stress of the girder 1.

First, the present invention is applicable to all kinds of bridge girders (various girders such as box girders, concrete girders, I-type girders).

The database 10 stores big data for loads at various times.

Big data is divided into data based on date and time, data on characteristics of date and time.

1. Date and time data.

For example, by measuring the load acting on the bridge girder 1 every hour for one year, a load data sheet for each hour is created. The event information (when a load larger than the allowable load of the bridge girder acts and the tension operation is required through the tension member 20) is extracted through comparison of the load data and the allowable load at the time of day, / Day / time, and the controller 40 controls the actuator 30 when the event information matches the current time information. The time information is in the form of a range based on the measured load to be removed after increasing the tension. That is, the range from the time when the allowable load is started to the time when the allowable load is extinguished.

This method does not satisfy the characteristics of the weekday, holiday, and holiday that change every year, and errors can occur.

That is, since April 1, 2018 is Sunday, April 1, 2019 is Monday, and traffic on a Sunday (weekends) and weekdays is different, the load acting on the bridge girder 1 is greatly different. If only the date is compared without considering the characteristics of the day of the week, an error may occur in the control of the tensile stress according to the present characteristics.

2. Data that takes into account the characteristics of the date.

In order to eliminate the errors of the date and time data, the measurement date is divided into weekday, weekend, holiday, national holiday, holiday, etc. by statistical analysis, and the database 10 is divided into 24 hours for each classification.

FIG. 2 is an exemplary view of a data sheet in a tabular form, and FIG. 3 is a graph showing an example of a load measurement result of 24 hours on a weekday basis. In FIG. 2, an event is an example of extracting and arranging a tension work time. In FIG. 3, L2 is an allowable load of event information.

Event information (tension operation) is determined on the basis of the measurement data for each date / time. For example, in the case of a weekday, since the load increases at the commute time, Can be classified. Also, in the case of holiday, it is possible to classify many time periods of return and nape as tension work time of bridge girder.

In the case of measuring the load of the bridge girder for the construction of the database 10, when the tension is applied to the bridge girder 1 through the tension member, it is excluded from the data analysis in order to increase the reliability of the database 10.

The tension member 20 is a typical product used for tensioning the bridge girder 1 and is wired along the longitudinal direction on the bottom surface of the bridge girder 1 and fixed on both sides in the longitudinal direction. Is connected to the actuator (30).

The tension members 20 are installed symmetrically with respect to the center of the bridge girder 1 (left-right symmetry in FIG. 1).

Although the tension member 20 is shown as an external tension member installed on the outside of the bridge girder 1 in the figure, it is also possible to install the tension member 20 inside the bridge girder 1.

The actuator 30 is, for example, a hydraulic cylinder and connected to one side or both sides of the tension member 20 to pull the tension member 20 to give the tension to the bridge girder 1. In this state, the tension member 20 is released, , And this operation is performed through the control of the controller (40).

The controller 40 controls the actuator 30 through comparison between the information of the database 10 and the current time information to control the tension of the bridge girder 1 before the load greater than the allowable load acts on the bridge girder 10 Of course, there are calendar information and time information for controlling the tension relief after the time information of the range has passed (after the load more than the allowable load has disappeared), and for checking the date information that can be compared with the data of the database 10.

The specific control of this embodiment will be described in the following control method.

The big data based active bridge girder tensile stress control method according to this embodiment is as follows.

1. Everyday.

The tension member 20 is in a state in which the bridge girder 1 is not tense, and therefore, the bridge girder 1 is in a state of having only the load-bearing capacity in the manufacturing state.

2. Compare data.

The controller 40 compares the information of the day with the data of the database 10 and matches the corresponding day of the week with the classification of the weekday / holiday / holiday / holiday, and compares the current time with the event information of the database 10 For example, in the case of weekday, if the event information is the commute time zone (8:00 to 10:00, 18:00 to 20:00), the current time is compared with the commute time zone.

3. Nervousness.

If it is determined that the current time matches the event information of the database as a result of the data comparison process, the controller 40 controls the operation of the actuator 30 to apply tension to the bridge girder 1 by pulling the tension member 20 As a result, the tensile stress due to the action of the load is reduced. For example, when the current time is 8:00, the controller 40 controls the operation of the actuator 30 (when the actuator 30 is a hydraulic cylinder, the hydraulic oil is supplied to one side to cause the tensile member 20 to be pulled).

The controller (40) maintains the tension of the bridge girder (1) through the control of the actuator (30). Therefore, the bridge girder 1 supports the dynamic load of the vehicle with a greater load-bearing capacity than before the tension, and reduces the tensile stress due to the load. The degree of tension of the tensile member 20 under the control of the controller 40 can be freely changed according to the allowable load or the like, and thus is not limited to a specific numerical value.

In this state, when the current time reaches 9 o'clock, the tension member 20 is released to the initial state through the reverse control of the actuator 30, and the bridge girder 1 is switched to a state having only its own load-bearing capacity without the forced tensions.

≪ Example 2 >

4, the present embodiment detects the load acting on the bridge girder in real time through the sensor 50 and determines that the detected value is a load required to tense the bridge girder 1, The first embodiment differs from the first embodiment in that it tensions the second embodiment. That is, the first embodiment uses the data of the database 10 without real-time detection of the load, and the second embodiment uses the data of the database 10 and the real-time sensing value of the load.

Therefore, the present embodiment is characterized in that the first permissible criterion (the first criterion load compared with the real-time sensed value) using the sensed value of the sensor and the second permissible load (the data constructed in the database, The first allowable load and the second allowable load are different from each other, for example, the first allowable load is 90% of the maximum allowable load, the second allowable load is the first reference load, It may be 80% of the maximum allowable load with a load smaller than the allowable load.

The sensor 50 may be a load sensor for sensing the load of the bridge girder 1, a crack sensor for detecting the crack of the bridge girder 1, or the like.

As shown in FIG. 6, it is preferable that the sensor 50 is installed in front of the center of the bridge girder 1 (when the running direction of the reference vehicle of FIG. 1 is the right side from the left side of the bridge girder 1) This is because, when the sensor 50 is installed in the center of the bridge girder 1, when the vehicle senses a load when the vehicle passes the center of gravity and tensions the tension member 20, the tension is generated after the vehicle has already passed through the center, There is no stress reduction effect and the bridge girder 1 is subjected to a large load. If the sensor 50 is installed in front of the center, tensile stress of the bridge girder 1 can be reduced before a large load passes through the center .

FIG. 5 is an exemplary view of a graph showing the load sensed in real time by the sensor 50. FIG.

The big data based active bridge girder tensile stress control method according to this embodiment is as follows. 1. Normal - 2. Comparison of data - 3. The process of tension is the same as that of the first embodiment described above, and the authentication stress of the bridge girder 1 is controlled through the event information stored in the database 10 and the current time information, The embodiment includes the following additional steps.

4. Sensing.

The sensor 50 senses a load acting on the bridge girder 1 in real time (every hour or minute, etc.).

5. Comparison of sensing value and reference value.

The controller 40 compares the sensed value sensed by the sensor 50 with the reference value (allowable load) and compares the sensed value with the reference value (allowable load). If the sensed value is equal to or higher than the reference value It is possible to control the operation of the actuator 30 so that the tensile stress of the bridge girder 1 can be reduced due to the tension of the tension member 20. [ If the sensed value of the sensor 50 is lower than the reference value, the actuator 30 releases the tensile force 20. The tension of the tension member 20 is released before the tension, that is, the load bearing state of the bridge girder 1 or the tension member 20 in a primary tension state.

The present embodiment has an effect of reducing the tensile stress of the bridge girder 1 even when a large load acts on the database 10 without being managed as event information, The tension of the bridge girder 1 is further increased and the tensile stress is further reduced even if a larger load is applied during tensioning through the bridge girder 1. [

≪ Example 3 >

In this embodiment, the tensile stress reduction state of the bridge girder is set to the initial state by tensing the tension member from the installation stage, and the additional tensile stress of the bridge girder is further increased by further tensing the tension member through the method of Example 1 or Example 2 Reduction. While the first and second embodiments are in a state in which there is no external tension force when the tension is extinguished, the present embodiment is a state in which a tensile force is basically given through the tension member even if the tension disappears.

Therefore, it is applied to old bridges where external tensions are already introduced.

A technique not specifically described in this embodiment is similar to the second embodiment.

Although at least one tension member 20 is installed on the basis of a lane road, it is possible to control both the lane road control and the slab full control. In the above description, the tension member 20 is installed at the bottom of the bridge girder 1, It may be difficult to install the bridge girder 1 at the bottom of the bridge girder 1 in consideration of the shape of the bridge girder 1. Therefore, the bridge girder 1 may be installed on both sides of the bridge girder 1 as shown in Fig. More specifically, one or more tension members 20L and 20R are provided on the left and right sides of the bridge girder 1, respectively, and both sides of the bridge girder 1 are provided along the longitudinal direction of the bridge girder 1. The tension members 20L and 20R Are respectively tensed through the left and right actuators 30L and 30R, respectively.

<Example 4>

The present embodiment is a load control using a controller for sensing a load of a bridge girder in real time and a controller for controlling a tension of the bridge through control of an actuator. The sensor senses the load of the bridge girder in real time and transmits it to the controller. If the current sensing value is higher than the reference value by comparing the reference value (allowable load) with the current sensing value, the actuator is controlled to tense the tension member. If the current sensing value becomes lower than the reference value in this state, Let it go.

Meanwhile, the present invention may include a communication module for monitoring the control of the controller 40, the operation of the actuator 30, and the like in a remote control room.

The communication module is capable of various communication methods such as wireless, and transmits control information provided from the controller 40 to a server of the control room. The server of the control room stores the control information and outputs the control information to the monitor, .

1: Bridge girder, 10: Database
20: Tension material, 30: Actuator
40: controller, 50: sensor

Claims (10)

A database for storing the event information of an allowable load or more which requires a tension operation among the measured values by measuring a load acting on the bridge girder together with time information;
A tensile member installed in the tensile direction on the bridge girder and reducing a tensile stress generated in the bridge girder;
An actuator for pulling at least one side of both sides in the longitudinal direction of the tensile material in a tension direction to release tension in a tensioned state;
And a controller for comparing the time information of the event information stored in the database with the current time information and controlling the tense or the relaxation of the tense through the actuator,
The database is classified into a weekday, a weekend, a holiday, a national holiday, and a holiday, and classified into 24 hours for each major classification,
The controller compares the current day with information of the current day, weekday, holiday, holiday, holidays and holidays of the main category, selects the corresponding major category from among the major categories, compares the time range of the event information with the current time in the selected major category, Wherein the control unit controls tension of the bridge girder through the tension member prior to the start of the event information and controls the tension relief through the tension member after the end of the event information. controller. A database for storing the event information of an allowable load or more which requires a tension operation among the measured values by measuring a load acting on the bridge girder together with time information;
A tensile member installed in the tensile direction on the bridge girder and reducing a tensile stress generated in the bridge girder;
An actuator for pulling at least one side of both sides in the longitudinal direction of the tensile material in a tension direction to release tension in a tensioned state;
A sensor installed on the bridge girder and sensing a change in load of the bridge girder;
And a controller for comparing the time information of the event information stored in the database with the current time information and controlling the tensions or strains of the tensions through the actuator,
The sensor is installed in front of a central portion between both fulcrums of the bridge girder
The database is classified into a weekday, a weekend, a holiday, a national holiday, and a holiday, and classified into 24 hours for each major classification,
The controller compares the current day with information of the current day, weekday, holiday, holiday, holidays and holidays of the main category, selects the corresponding major category from among the major categories, compares the time range of the event information with the current time in the selected major category, Wherein the control unit controls tension of the bridge girder through the tension member before the start of the event information and controls the tension relief through the tension member after the end of the event information, Controlling tension and tension in tension,
The control unit controls the tension of the vehicle passing through the bridge girder before passing through the center of the bridge girder on the basis of the first allowable load smaller than the maximum load when the actuator is controlled based on the sensing value of the sensor, And controlling the actuator based on the event information constructed in the database based on a second allowable load smaller than the first allowable load. delete delete delete The big data-based active bridge girder tensile stress control device according to claim 1 or 2, further comprising a communication module for transmitting the control information of the controller to a server of the control room.
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