Bridge reinforcement control method and system

Abstract

The invention discloses a bridge reinforcement control method and system, a shape memory alloy is mounted at a set position of a to-be-reinforced bridge through an anchorage device, and the method comprises the following steps: acquiring tension data of the shape memory alloy; calculating the current prestress of the shape memory alloy according to the tension data of the shape memory alloy; the current prestress of the shape memory alloy is compared with a preset prestress threshold value, when the comparison result meets a preset activation criterion, an activation program is started to activate the shape memory alloy, and therefore the needed prestress is provided for the to-be-reinforced bridge. Real-time monitoring of the prestress loss of the reinforcing material is achieved, automatic prestress compensation can be conducted in time after the prestress loss of the reinforcing material is achieved, long-term maintenance and reinforcement of the old dangerous and damaged bridge are achieved, and the reinforcement construction difficulty and the management and maintenance cost are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge repair, and in particular relates to a bridge reinforcement control method and system. Background Art

[0002] As bridges age and vehicle loads increase, they begin to suffer from various defects, such as concrete cracking, steel corrosion, prestress loss, and excessive deformation. These problems seriously impact the normal operation of bridges and the safety of life and property, necessitating the reinforcement and renovation of these old and damaged bridges.

[0003] Existing active bridge reinforcement technologies include external prestressed tendon reinforcement and external prestressed carbon fiber plate / reinforcement. These reinforcement technologies can effectively reduce the deflection of the beam, control concrete cracks, improve the stress state of unfavorable sections, and enhance the bearing capacity of the bridge. However, because existing reinforcement technologies generally do not have corresponding monitoring systems during construction, problems such as unclear loss of prestress in the reinforcement materials may occur during use. In addition, after prestress loss occurs, existing reinforcement technologies generally require secondary tensioning of the reinforcement materials using heavy tensioning equipment such as jacks and oil pumps, which leads to problems such as difficult construction and cumbersome procedures, and also increases the management and maintenance costs of the bridge. Summary of the Invention

[0004] In order to address the deficiencies in the prior art, the present invention provides a bridge reinforcement control method and system, which realizes real-time monitoring of the prestress loss of reinforcement materials. When the prestress of the reinforcement materials is lost, the prestress can be automatically compensated in time, thereby realizing long-term repair and reinforcement of old and damaged bridges, reducing the difficulty of reinforcement construction and management and maintenance costs.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: In a first aspect, a bridge reinforcement control method is provided, in which a shape memory alloy is installed at a set position of a bridge to be reinforced by an anchor. The method comprises: obtaining tension data of the shape memory alloy; calculating the current prestress of the shape memory alloy based on the tension data of the shape memory alloy; comparing the current prestress of the shape memory alloy with a preset prestress threshold value, and when the comparison result meets a preset activation criterion, starting an activation program to activate the shape memory alloy, thereby providing the required prestress for the bridge to be reinforced.

[0006] Furthermore, the current prestress of the shape memory alloy is calculated according to the tensile force data of the shape memory alloy, including: , in, represents the current prestress of the shape memory alloy, represents the collected tensile data of shape memory alloy, Represents the cross-sectional area of the shape memory alloy.

[0007] Furthermore, the preset activation criterion is: ,in, Indicates the preset prestress threshold.

[0008] Furthermore, starting an activation program to activate the shape memory alloy includes: starting a heating unit to heat the shape memory alloy; collecting the surface temperature of the shape memory alloy; and with the preset target activation temperature Compare, if: , the heating unit is turned off; when the surface temperature of the shape memory alloy Reduce to no higher than ambient temperature When the activation time is up, the review procedure is started to review the prestress of the activated shape memory alloy.

[0009] Furthermore, the prestressing of the activated shape memory alloy is reviewed, including: collecting the tensile force data of the shape memory alloy after activation , and calculate the current prestress after the shape memory alloy is activated , , If the current prestress of the shape memory alloy after activation With the preset prestress threshold Not satisfied with: , then increase the preset target activation temperature to After that, the shape memory alloy is reactivated until the following conditions are met: ,in, Indicates a single increment of the target activation temperature.

[0010] In a second aspect, a bridge reinforcement control system is provided, comprising: a data acquisition module configured in a control unit, for acquiring tension data of the shape memory alloy; a prestress calculation module, for calculating the current prestress of the shape memory alloy based on the tension data of the shape memory alloy; a comparison module, for comparing the current prestress of the shape memory alloy with a preset prestress threshold, and when the comparison result meets the preset activation criterion, starting an activation program to activate the shape memory alloy, thereby providing the required prestress for the bridge to be reinforced.

[0011] Furthermore, it also includes: a reinforcement unit, which is used to install the shape memory alloy at a set position of the bridge to be reinforced through an anchor; a temperature control unit, which is used to collect the ambient temperature and the surface temperature of the shape memory alloy and transmit them to the control unit; a heating unit, which is used to start / stop heating the shape memory alloy according to the instructions of the control unit; a force measuring unit, which is used to collect the tensile force data of the shape memory alloy and transmit it to the control unit; an alarm unit, which is used to issue an alarm message when the comparison result meets the preset activation criterion; and a storage unit, which is used to store the preset prestress threshold, target activation temperature, and the single increase temperature of the preset target activation temperature.

[0012] Furthermore, the reinforcement unit also includes: an insulating layer for preventing electric current from passing through the shape memory alloy and the anchor into the bridge to be reinforced; a heat-insulating layer for preventing heat generated during the activation of the shape memory alloy from being transferred to the bridge to be reinforced; and a heat-resistant protective layer for protecting the shape memory alloy from environmental corrosion and mechanical damage, while also having an aesthetic effect.

[0013] Furthermore, the force measuring unit includes a pressure sensor for collecting tensile force data of the shape memory alloy and a signal processing module 1 for converting the collected tensile force data into an electrical signal and transmitting it to the control unit; the temperature control unit includes a temperature sensor 2 for collecting ambient temperature, a temperature sensor 1 for collecting the surface temperature of the shape memory alloy, and a signal processing module 2 for converting the collected ambient temperature and the surface temperature of the shape memory alloy into electrical signals and transmitting them to the control unit.

[0014] Furthermore, the heating unit includes a resistance heating module for heating the shape memory alloy.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention installs the shape memory alloy at a set position of the bridge to be reinforced through an anchor; calculates the current prestress of the shape memory alloy based on the tensile force data of the shape memory alloy and compares it with a preset prestress threshold; when the comparison result meets the preset activation criterion, starts the activation program to activate the shape memory alloy, thereby providing the required prestress for the bridge to be reinforced; the present invention realizes real-time monitoring of the prestress loss of the reinforcement material, and can automatically compensate for the prestress in time when the prestress of the reinforcement material is lost, thereby realizing long-term maintenance and reinforcement of old and damaged bridges, reducing the difficulty of reinforcement construction and management and maintenance costs; (2) The present invention can gradually release the shape memory effect of the Fe-Mn-Si based alloy by controlling the activation temperature, and accurately provide the prestress required for the reinforcement of old and damaged bridges over a long period of time; (3) The control system of the present invention can monitor the prestress value of the Fe-Mn-Si based alloy in real time and clearly identify the prestress loss situation; (4) The control system of the present invention can promptly provide feedback on prestress loss to bridge maintenance personnel and automatically compensate for the lost prestress; (5) The control system of the present invention does not require heavy tensioning equipment such as jacks and oil pumps when compensating for prestress loss, effectively reducing the management and maintenance costs of the bridge; (6) The control system of the present invention can be applied to a variety of bridges, including steel bridges, wooden bridges, masonry bridges, reinforced concrete bridges, prestressed concrete bridges and steel-concrete composite beam bridges. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural block diagram of a bridge reinforcement control system provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the bridge reinforcement control process in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0018] Example 1 A bridge reinforcement control method is disclosed, in which a shape memory alloy is installed at a set position of the bridge to be reinforced via an anchor. The method comprises: obtaining tension data of the shape memory alloy; calculating the current prestress of the shape memory alloy based on the tension data of the shape memory alloy; comparing the current prestress of the shape memory alloy with a preset prestress threshold value; and when the comparison result meets a preset activation criterion, starting an activation program to activate the shape memory alloy, thereby providing the required prestress for the bridge to be reinforced.

[0019] The current prestress of the shape memory alloy is calculated according to the tensile force data of the shape memory alloy, including: , in, represents the current prestress of the shape memory alloy, represents the collected tensile data of shape memory alloy, Represents the cross-sectional area of the shape memory alloy.

[0020] The preset activation criteria are: ,in, Indicates the preset prestress threshold.

[0021] Start the activation program to activate the shape memory alloy, including: start the heating unit to heat the shape memory alloy; collect the surface temperature of the shape memory alloy and with the preset target activation temperature Compare, if: , the heating unit is turned off; when the surface temperature of the shape memory alloy Reduce to no higher than ambient temperature When the activation time is up, the review procedure is started to review the prestress of the activated shape memory alloy.

[0022] Conduct prestress review on the activated shape memory alloy, including: collecting tensile force data after shape memory alloy activation , and calculate the current prestress after the shape memory alloy is activated , , If the current prestress of the shape memory alloy after activation With the preset prestress threshold Not satisfied with: , then increase the preset target activation temperature to After that, the shape memory alloy is reactivated until the following conditions are met: ,in, Indicates a single increment of the target activation temperature.

[0023] The present invention gradually releases the shape memory effect stored inside the shape memory alloy, thereby achieving long-term repair and reinforcement of old and damaged bridges, and solving the problems of existing reinforcement technology such as unclear prestress loss, difficult construction, cumbersome operation and high management and maintenance costs.

[0024] Example 2 Based on the bridge reinforcement control method described in Example 1, this embodiment provides a bridge reinforcement control system, including: a data acquisition module configured in a control unit, for obtaining tension data of the shape memory alloy; a prestress calculation module, for calculating the current prestress of the shape memory alloy based on the tension data of the shape memory alloy; a comparison module, for comparing the current prestress of the shape memory alloy with a preset prestress threshold, and when the comparison result meets the preset activation criterion, starting an activation program to activate the shape memory alloy, thereby providing the required prestress for the bridge to be reinforced.

[0025] like Figure 1 As shown, the bridge reinforcement control system also includes a reinforcement unit, a force measuring unit, a heating unit, a temperature control unit, a control unit, a power supply unit, a switch unit, a storage unit, a display unit and an alarm unit.

[0026] The reinforcement unit consists of a shape memory alloy (Fe-Mn-Si-based alloy), anchors, nuts, thermal insulation, insulating layers, and heat-resistant protective layers. Fe-Mn-Si-based alloy is a shape memory alloy material with a unique shape memory effect and excellent mechanical properties. By applying external stretching to induce plastic deformation in the Fe-Mn-Si-based alloy, and then heating it through methods such as electrical activation, the stored shape memory effect is released, generating the prestress required for bridge reinforcement.

[0027] Threads matching the nuts are provided at both ends of the Fe-Mn-Si-based alloy within a certain length range (about 20 cm); the anchor is used to install and fix the Fe-Mn-Si-based alloy and transfer the prestress generated by the alloy to the bridge to be reinforced; the nut is used to fix and pre-tighten the Fe-Mn-Si-based alloy; the insulating layer is used to prevent current from passing through the Fe-Mn-Si-based alloy and the anchor into the bridge to be reinforced, thereby preventing electrical accidents such as electric shock and short circuit during the power-on activation process; the thermal insulation layer is used to prevent the heat generated during the activation of the Fe-Mn-Si-based alloy from being transferred to the bridge to be reinforced, thereby avoiding heat loss to the bridge; the heat-resistant protective layer is used to protect the Fe-Mn-Si-based alloy from environmental corrosion and mechanical damage, while also having an aesthetic effect.

[0028] The force measuring unit consists of a pressure sensor and a signal processing module. The pressure sensor passes through the end of the Fe-Mn-Si alloy and is placed between the anchor and the nut to collect tensile force data of the Fe-Mn-Si alloy. The signal processing module is used to obtain and process the electrical signal from the pressure sensor and transmit it to the control chip.

[0029] The heating unit is composed of a resistance heating module, which is used to activate the Fe-Mn-Si based alloy by electricity and generate prestress.

[0030] The temperature control unit consists of temperature sensor 1, temperature sensor 2, and signal processing module 2. Temperature sensor 1 is placed on the surface of the Fe-Mn-Si alloy to collect the alloy's surface temperature. Temperature sensor 2 is placed on the surface of the beam to be reinforced, far away from the Fe-Mn-Si alloy, to collect the ambient temperature. Signal processing module 2 is used to acquire and process the electrical signals from the temperature sensors and transmit them to the control chip.

[0031] The control unit consists of a control chip. The functions of the control chip include: (1) obtaining the data processed by the signal processing module 1 and converting it into the prestress data of the Fe-Mn-Si based alloy, and judging whether to start the alarm unit and the heating unit based on the prestress data; (2) obtaining the surface temperature and ambient temperature data of the Fe-Mn-Si based alloy processed by the signal processing module 2, and judging whether to start or stop the heating unit based on the temperature data; (3) displaying the prestress and temperature in real time on the display unit and storing them in real time in the storage unit; (4) reading the preset data of the bridge maintenance personnel in the storage unit.

[0032] The storage unit is used to store preset data for bridge maintenance personnel, as well as prestress and temperature data. The power supply unit is used to supply power to the control system. The switch unit is used to start or shut down the control system.

[0033] The specific embodiments of the present invention are as follows Figure 2 As shown, the description is as follows: S1: Lay the insulation layer and thermal insulation layer in sequence on the tension side of the bridge to be reinforced, install and fix the anchor; pre-install the Fe-Mn-Si based alloy on the anchor, and apply a heat-resistant protective layer on the alloy surface.

[0034] S2: Install the pressure sensor at the end of the Fe-Mn-Si-based alloy; fix the first temperature sensor on the surface of the Fe-Mn-Si-based alloy; fix the second temperature sensor on the surface of the bridge to be reinforced, and it should be far away from the Fe-Mn-Si-based alloy to measure the ambient temperature; use nuts to fix and pre-tighten the Fe-Mn-Si-based alloy.

[0035] S3: Real-time acquisition of the tensile force of Fe-Mn-Si based alloy by the force measuring unit , and transmit it to the control chip for analysis and processing to obtain the prestressed state of the alloy. ,in A is the cross-sectional area of the Fe-Mn-Si based alloy.

[0036] S4: The control chip retrieves the prestress threshold value preset by the bridge maintenance personnel in the storage unit , determine the prestress of Fe-Mn-Si based alloy Is it below the threshold? ,Right now If not, continue to monitor the prestress of the Fe-Mn-Si based alloy on a daily basis; if so, activate the alarm unit to notify the bridge maintenance personnel and automatically enter the activation stage.

[0037] S5: Start the resistance heating module to activate the Fe-Mn-Si based alloy, and the control unit calls the target activation temperature preset by the bridge maintenance personnel in the storage unit At the same time, the temperature control unit is started and the real-time temperature of the Fe-Mn-Si based alloy surface is obtained through the temperature sensor. , and transmitted to the control chip for analysis.

[0038] S6: Determine the real-time temperature Is it higher than the target activation temperature? ,Right now If not, repeat step S5 to continue energizing the Fe-Mn-Si based alloy; if so, stop heating and enter the cooling stage.

[0039] S7: Get the ambient temperature from the temperature sensor 2 , and transmitted to the control chip for analysis.

[0040] S8: Determine the real-time temperature of Fe-Mn-Si based alloy Is it not higher than the ambient temperature? ,Right now Is it established? If not, continue cooling. If so, it means that the surface temperature of the Fe-Mn-Si based alloy has been cooled to the ambient temperature, and then enter the prestressing review stage.

[0041] S9: The tensile force of Fe-Mn-Si based alloy is obtained by the force measuring unit , and transmit it to the control chip for analysis and processing to obtain the compensated prestress of the alloy .

[0042] S10: Determine the prestress after compensation Is it higher than the prestress threshold? ,Right now Is it true? If so, it means that the prestress of the Fe-Mn-Si based alloy after activation compensation meets the structural reinforcement requirements, and the control system enters the daily monitoring stage; if not, increase the preset target activation temperature , that is, ,in The single increase temperature of the target activation temperature is recommended to be in the range of 15℃~50℃, or it can be set by the bridge maintenance personnel. Then, repeat steps S5~S7 until Established.

[0043] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A bridge reinforcement control method, characterized in that: The shape memory alloy is installed at a set position of the bridge to be reinforced by an anchor, and the method includes: Obtaining tensile force data of shape memory alloys; Calculating the current prestress of the shape memory alloy according to the tensile force data of the shape memory alloy; The current prestress of the shape memory alloy is compared with a preset prestress threshold. When the comparison result meets the preset activation criterion, the activation program is started to activate the shape memory alloy, thereby providing the required prestress for the bridge to be reinforced.

2. The bridge reinforcement control method according to claim 1, characterized in that: Calculate the current prestress of the shape memory alloy based on the tensile force data of the shape memory alloy, including: ， in, represents the current prestress of the shape memory alloy, represents the collected tensile data of shape memory alloy, Represents the cross-sectional area of the shape memory alloy.

3. The bridge reinforcement control method according to claim 2, characterized in that: The preset activation criteria are: ,in, Indicates the preset prestress threshold.

4. The bridge reinforcement control method according to claim 3, characterized in that: Initiate an activation procedure to activate the shape memory alloy, including: Starting the heating unit to heat the shape memory alloy; Collecting the surface temperature of shape memory alloy and with the preset target activation temperature Compare, if: , then turn off the heating unit; When the surface temperature of the shape memory alloy Reduce to no higher than ambient temperature When the activation time is up, the review procedure is started to review the prestress of the activated shape memory alloy.

5. The bridge reinforcement control method according to claim 4, characterized in that: Perform prestress review on activated shape memory alloy, including: Collecting tensile force data after shape memory alloy activation , and calculate the current prestress after the shape memory alloy is activated , ， If the current prestress of the shape memory alloy after activation With the preset prestress threshold Not satisfied with: , then increase the preset target activation temperature to After that, the shape memory alloy is reactivated until the following conditions are met: ,in, Indicates a single increment of the target activation temperature.

6. A bridge reinforcement control system, characterized in that: Included in the control unit: A data acquisition module, used to obtain tensile force data of the shape memory alloy; A prestress calculation module, used for calculating the current prestress of the shape memory alloy based on the tension data of the shape memory alloy; The comparison module is used to compare the current prestress of the shape memory alloy with a preset prestress threshold. When the comparison result meets the preset activation criterion, the activation program is started to activate the shape memory alloy, thereby providing the required prestress for the bridge to be reinforced.

7. The bridge reinforcement control system according to claim 6, characterized in that: Also includes: A reinforcement unit, used for installing the shape memory alloy at a set position of the bridge to be reinforced through an anchor; A temperature control unit, used to collect the ambient temperature and the surface temperature of the shape memory alloy and transmit them to the control unit; a heating unit, configured to start / stop heating the shape memory alloy according to an instruction of the control unit; A force measuring unit, used for collecting tensile force data of the shape memory alloy and transmitting the data to the control unit; An alarm unit, configured to issue an alarm message when the comparison result meets a preset activation criterion; The storage unit is used to store a preset prestress threshold, a target activation temperature, and a single increase temperature of the preset target activation temperature.

8. The bridge reinforcement control system according to claim 7, characterized in that: The reinforcement unit further includes: An insulating layer to prevent electric current from passing through the shape memory alloy and anchors into the bridge to be reinforced; A heat-insulating layer for preventing heat generated during activation of the shape memory alloy from being transferred to the bridge to be reinforced; The heat-resistant protective layer is used to protect the shape memory alloy from environmental corrosion and mechanical damage, while also serving an aesthetic purpose.

9. The bridge reinforcement control system according to claim 7, characterized in that: The force measuring unit includes a pressure sensor for collecting tension data of the shape memory alloy and a signal processing module 1 for converting the collected tension data into an electrical signal and transmitting the signal to the control unit; The temperature control unit includes a second temperature sensor for collecting ambient temperature, a first temperature sensor for collecting the surface temperature of the shape memory alloy, and a second signal processing module for converting the collected ambient temperature and the surface temperature of the shape memory alloy into electrical signals and transmitting them to the control unit.

10. The bridge reinforcement control system according to claim 7, characterized in that: The heating unit includes a resistance heating module for heating the shape memory alloy.

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