CN116448301A - Wireless transmission stress measurement system based on Lora - Google Patents
Wireless transmission stress measurement system based on Lora Download PDFInfo
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- CN116448301A CN116448301A CN202310448465.2A CN202310448465A CN116448301A CN 116448301 A CN116448301 A CN 116448301A CN 202310448465 A CN202310448465 A CN 202310448465A CN 116448301 A CN116448301 A CN 116448301A
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- acquisition
- lora
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- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 title claims abstract description 25
- 230000005540 biological transmission Effects 0.000 title claims abstract description 24
- 238000013500 data storage Methods 0.000 claims abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000007726 management method Methods 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 claims description 30
- 238000012360 testing method Methods 0.000 claims description 15
- 238000004458 analytical method Methods 0.000 claims description 10
- 238000002955 isolation Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 239000013307 optical fiber Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 238000010276 construction Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 6
- 238000009412 basement excavation Methods 0.000 abstract description 5
- 239000011435 rock Substances 0.000 abstract description 5
- 238000007781 pre-processing Methods 0.000 abstract description 2
- 238000011156 evaluation Methods 0.000 abstract 1
- 238000002474 experimental method Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 6
- 239000011378 shotcrete Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007405 data analysis Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a wireless transmission stress measurement system based on Lora, which comprises a lower computer hardware system and an upper computer software system, wherein the lower computer hardware system is used for real-time acquisition and preprocessing of stress data, wireless data receiving and transmitting and real-time data storage; the upper computer software system receives the measurement data through the USB interface, displays stress distribution of each measuring point in real time, and synchronously draws stress characteristic curves of each measuring point. The lower computer hardware system comprises a signal acquisition and transmission device and a signal receiving device, and the upper computer software system comprises a parameter input and management module, a data acquisition module and a data processing module. The system is used for monitoring the stress of the supporting anchor rod in the tunnel excavation construction process, has wireless acquisition and storage functions, and adopts the Lora wireless transmission protocol to transmit data to a remote control computer, so that the real-time online monitoring of the supporting anchor rod is realized, the problem that the stability of surrounding rock is difficult to measure in the initial stage of tunnel excavation can be solved, and the data support is provided for the safety evaluation of the tunnel.
Description
Technical Field
The invention relates to a supporting anchor rod safety detection system, in particular to a wireless transmission stress measurement system based on Lora.
Background
In the underground engineering construction process, unavoidable influence can be generated on the surrounding environment, wherein one of the most concerned problems is surrounding rock stress around the tunnel and ground surface subsidence in the tunnel excavation process. The shotcrete support is a support means commonly used in tunnel construction, and the anchor bolt support is adopted independently to be only used locally in the subway tunnel, and the anchor bolt is usually combined with the shotcrete, namely the anchor bolt support, so that the shotcrete support is widely applied in the subway tunnel.
Since the new oersted 60 th 20 th century, the surrounding rock monitoring and measuring technology is widely applied and developed as an important basis for judging the stability of the surrounding rock. The technology is mainly characterized in that strain gauges, stress meters, multipoint displacement meters and the like are adopted in construction to closely monitor surrounding rock strain, stress and displacement change conditions, so that corresponding supporting time and supporting scheme are determined, and dynamic informationized construction is realized.
Aiming at the limitations that the traditional on-site anchor rod stress test cable is difficult to lay, easy to damage and high in cost, a novel wireless transmission stress measurement system based on lora is developed and used for monitoring the stress of a supporting anchor rod in the excavation construction process. The system has wireless acquisition and storage functions, adopts the lora wireless transmission protocol to transmit data to a remote control computer, thereby realizing the real-time on-line monitoring of the supporting anchor rod and providing data support for the tunnel security assessment.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a wireless transmission stress measurement system based on Lora, which has the advantages of stable and reliable operation, high test precision, simple layout, low cost and no data missing caused by the damage of a test cable. On the basis of keeping the offline stress analysis function, the wireless stress tester not only can monitor the stress state of the tunnel anchor rod on line, but also can be widely applied to stress strain measurement of projects such as dams, bridges, foundation pits and the like, and has wide application prospect.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a wireless transmission stress measurement system based on Lora, its characterized in that includes lower computer hardware system and host computer software system, lower computer hardware system includes a plurality of stress sensor, a plurality of signal transmission module, wireless signal acquisition equipment and remote computer, and a plurality of stress sensor one-to-one sets up on the support stock, and every stress sensor all disposes and connects a signal transmission module, and a plurality of signal transmission modules and wireless signal acquisition equipment communication connection, wireless signal acquisition equipment and remote computer communication connection.
Preferably, the signal transmitting module comprises an electrical isolation unit, a signal amplifying unit, a main control unit A, a wireless transmitting unit and a data storage unit, wherein the electrical isolation unit is connected to a strain gauge of the stress sensor, the electrical isolation unit is connected with the main control unit A through the signal amplifying unit, and the main control unit A is connected with the wireless transmitting unit and the data storage unit;
the wireless signal acquisition equipment comprises a wireless receiving unit and a main control unit B, wherein the wireless receiving unit is in communication connection with the wireless transmitting unit, the wireless receiving unit is connected with the main control unit B, and the main control unit B is connected with a remote computer through an optical fiber network;
the signal transmitting module and the wireless signal acquisition equipment are realized through a Lora wireless acquisition and communication controller, and the Lora wireless acquisition and communication controller is used for data interval acquisition, storage and transmission and is internally provided with a lithium battery.
Preferably, the upper computer software system comprises a parameter input and management module, a data acquisition module, a data storage module and a data processing module, wherein the parameter input and management module is used for inputting the ID of the strain gauge and inputting the sampling interval; the data acquisition module is divided into an upper computer acquisition part and a lower computer acquisition part, the upper computer acquisition part sends an acquisition instruction to the lower computer acquisition part through a USB port, and the lower computer acquisition part acquires data according to a certain time sequence according to the instruction, uploads the data according to a defined format and displays the data in real time; the data storage module is used for automatically storing the test data of each test working condition in a file and attaching a working parameter file for later analysis; and the data processing module performs conversion processing on the measurement data according to the standard.
Preferably, the stress sensor is a steel bar stress sensor, the tensile stress range is 300Mpa, the compressive stress range is 100Mpa, the sampling rate is up to 3 min/time, the A/D resolution is 24 bits, the wireless communication distance is not less than 2km, and the wireless communication protocol is Lora wireless communication.
Preferably, the main control unit A and the main control unit B are all MCUs, and the main control unit A performs analog-to-digital conversion, real-time storage and real-time wireless transmission; the main control unit B controls the wireless receiving unit to receive real-time data and transmits the real-time data to the upper computer software system through the USB interface so as to realize the display analysis of stress-strain data; the wireless receiving unit and the wireless transmitting unit are in communication connection with each other by adopting an ISM frequency band common to RF433 MHz.
Preferably, the strain gauge on the stress sensor is provided with a bridge excitation circuit, so that nonlinear errors are reduced, and the measurement accuracy of the strain gauge is ensured.
Compared with the prior art, the invention has the following advantages:
1. the method is used for monitoring the stress of the supporting anchor rod in the tunnel excavation construction process. The system has wireless acquisition and storage functions, adopts the lora wireless transmission protocol to transmit data to a remote control computer, thereby realizing the real-time on-line monitoring of the supporting anchor rod and providing data support for the tunnel security assessment.
2. The invention has the advantages of stable and reliable operation, high test precision, simple layout, low cost and no data missing caused by the damage of the test cable. On the basis of keeping the offline stress analysis function, the wireless stress tester not only can monitor the stress state of the tunnel anchor rod on line, but also can be widely applied to stress strain measurement of projects such as dams, bridges, foundation pits and the like, and has wide application prospect.
The invention is described in further detail below with reference to the drawings and examples.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present invention.
FIG. 2 is a schematic diagram of a lower computer hardware system according to the present invention.
Fig. 3 is a schematic circuit diagram of wireless transmission in the present invention.
Fig. 4 is a schematic circuit diagram of a data storage unit in the present invention.
Fig. 5 is a schematic diagram of a power circuit in the present invention.
Fig. 6 is a schematic circuit diagram of the master control unit a in the present invention.
FIG. 7 is a schematic representation of two counterweights used in the comparative experiments of the present invention.
Detailed Description
As shown in fig. 1 to 6, the invention comprises a lower computer hardware system and an upper computer software system, wherein the lower computer hardware system is mainly used for real-time acquisition and preprocessing of stress data, wireless data receiving and transmitting and real-time data storage; the upper computer software system receives the measurement data through the USB interface, displays the stress distribution of each measuring point in real time, and synchronously draws the stress characteristic curve of each measuring point. The lower computer hardware system comprises a plurality of stress sensors, a plurality of signal transmitting modules, wireless signal acquisition equipment and a remote computer, wherein the stress sensors are arranged on the supporting anchor rod in one-to-one correspondence, each stress sensor is configured and connected with one signal transmitting module, the signal transmitting modules are in communication connection with the wireless signal acquisition equipment, and the wireless signal acquisition equipment is in communication connection with the remote computer.
In this embodiment, the signal transmitting module includes an electrical isolation unit, a signal amplifying unit, a main control unit a, a wireless transmitting unit and a data storage unit, where the electrical isolation unit is connected to a strain gauge of the stress sensor, the electrical isolation unit is connected to the main control unit a through the signal amplifying unit, and the main control unit a is connected to the wireless transmitting unit and the data storage unit;
the wireless signal acquisition equipment comprises a wireless receiving unit and a main control unit B, wherein the wireless receiving unit is in communication connection with the wireless transmitting unit, the wireless receiving unit is connected with the main control unit B, and the main control unit B is connected with a remote computer through an optical fiber network;
the signal transmitting module and the wireless signal acquisition equipment are realized through a Lora wireless acquisition and communication controller, and the Lora wireless acquisition and communication controller is used for data interval acquisition, storage and transmission and is internally provided with a lithium battery.
In this embodiment, the upper computer software system includes a parameter input and management module, a data acquisition module, a data storage module and a data processing module, where the parameter input and management module implements input of a strain gauge ID and input of a sampling interval; the data acquisition module is divided into an upper computer acquisition part and a lower computer acquisition part, the upper computer acquisition part sends an acquisition instruction to the lower computer acquisition part through a USB port, and the lower computer acquisition part acquires data according to a certain time sequence according to the instruction, uploads the data according to a defined format and displays the data in real time; the data storage module is used for automatically storing the test data of each test working condition in a file and attaching a working parameter file for later analysis; and the data processing module performs conversion processing on the measurement data according to the standard.
In this embodiment, the stress sensor is a steel bar stress sensor, the tensile stress range is 300Mpa, the compressive stress range is 100Mpa, the sampling rate is the highest 3 min/time, the uncertainty of the system is 0.3%, the null shift is 3 mu epsilon/4 h, the A/D resolution is 24 bits, the wireless communication distance is not less than 2km, the wireless communication protocol is Lora wireless communication, and the measurement channel is 4 channels.
In this embodiment, the master control unit a and the master control unit B are both MCUs, and the master control unit a performs analog-to-digital conversion, real-time storage, and real-time wireless transmission; the main control unit B controls the wireless receiving unit to receive real-time data and transmits the real-time data to the upper computer software system through the USB interface so as to realize the display analysis of stress-strain data; the wireless receiving unit and the wireless transmitting unit are in communication connection with each other by adopting an ISM frequency band common to RF433 MHz.
In this embodiment, the strain gauge on the stress sensor is configured with a bridge excitation circuit, so that nonlinear errors are reduced, and measurement accuracy of the strain gauge is ensured.
When the intelligent monitoring system is used, the stress sensor intermittently collects stress values of the supporting anchor rod and sends the stress values to the main control unit A, the stress values are stored in real time by the data storage unit, the main control unit A processes data information and then sends the processed data information to the wireless receiving unit through the wireless transmitting unit and finally sends the processed data information to the remote computer to display the data information, and a chart is drawn to complete real-time sampling monitoring.
In order to verify the accuracy and stability of the system, a reinforcing steel bar counterweight loading and unloading experiment is designed. Experimental results show that the weight of the balancing weight obtained through the wireless stress acquisition and test system is identical with the actual value, and the data acquired through multiple experiments are good in consistency.
Experimental comparative example:
instrument appliance
Two kinds of balancing weights A and B are shown in figure 7 (the balancing weight A is about 265kg on the left side of the drawing, the balancing weight B is about 145kg on the right side of the drawing), a magnetic hanger (42 kg), 2 anchor rods (containing strain gauge type pressure sensors), a lora wireless acquisition and communication controller and a wireless data acquisition instrument.
Principle of experiment
The strain gauge type pressure sensor is used for measuring the balancing weight with known weight through an anchor rod tension experiment, and measuring data of the balancing weight is transmitted to the testing host through the Lora wireless acquisition and communication controller, so that a measuring result is read.
Experimental procedure
This experiment is divided into two groups
The strain gauge type pressure sensor is connected with the wireless acquisition and communication controller firstly and then is connected to the data acquisition instrument through the lora wireless connection. After the wireless data acquisition instrument is started, the sensor number is required to be set, the wireless data acquisition instrument is connected to the corresponding pressure sensor, and then pressure data are acquired.
Experimental results and data processing
Given that the weight of the balancing weight A is 265kg and the weight of the balancing weight B is 145kg, the weights of the balancing weights A and B are calculated to be 2.60KN and 1.42KN respectively.
A first group: tension data of the balancing weights A under different configuration conditions of the anchor rod 1 are measured through a loading and unloading experiment of the wireless stress system, and measurement results are shown in tables 1 and 2.
Table 1 pressure data displayed by wireless data acquisition instrument
Table 2 tension of each weight a applied to the anchor 1
| Balancing weight number | A1 | A2 | A3 | A4 |
| Pulling force (kN) | 2.37* | 2.44 | 2.45 | 2.48 |
Note that: 2.37*: the weight force of the balancing weight A needs to be removed from the magnetic suspension system by 0.41KN when the pulling force of the balancing weight A is calculated.
Second group: tension data of balancing weights A and B under different calculation configuration conditions of the anchor rod 2 are measured through a loading and unloading experiment of a wireless stress system, and measurement results are shown in tables 3 and 4.
Table 3 pressure data displayed by the wireless data acquisition instrument
| Balancing weight number | Pulling force (kN) |
| A1 | 2.33* |
| A2 | 2.42 |
| B1 | 1.38 |
| B1’ | 1.36 |
| B1+B2 | 2.73 |
| A3 | 2.43 |
| A4 | 2.45 |
Table 4 tension of each weight applied to the anchor rod 2
The tensile force data analysis of the balancing weights A, B applied to the anchor rods is shown in tables 5 and 6. As shown in Table 5, the tension data of the balancing weights A of the anchor rods, which are obtained through experiments, are 8 groups, the standard deviation is 0.045, the deviation between the data and the average value of 2.42kN is smaller, and the data consistency is better. The pull value of the balancing weight A borne by the anchor rod is known to be about 2.60kN in theory and is close to the average value measured by the experiment, so that the accurate data measured by the experiment is shown.
Table 5 analysis of tension data of weight a applied to anchor rod
As shown in Table 5, the tension data of the weight B of the anchor rod, which is measured by the experiment, is 3 groups, the standard deviation of the tension data is 0.008, which indicates that the deviation between the tension data and the average value of 1.37kN is smaller, and the data consistency is better. The pull force of the balancing weight B applied to the anchor rod is about 1.42N in theory and is close to the average value measured by experiments, and the data measured by the second group of experiments are accurate. By combining the data analysis results, the weight of the balancing weight obtained by the wireless stress acquisition test system has small error with the actual value, and the data acquired by multiple experiments have good consistency, so that the accuracy and the stability of the test system can be verified.
Table 6 analysis of tension data of weight B applied to anchor rod
Note that: 1.37*: assuming that the weights B1 and B2 are exactly equal, the weight of a single weight is about 1.37KN.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (6)
1. The utility model provides a wireless transmission stress measurement system based on Lora, its characterized in that includes lower computer hardware system and host computer software system, lower computer hardware system includes a plurality of stress sensor, a plurality of signal transmission module, wireless signal acquisition equipment and remote computer, and a plurality of stress sensor one-to-one sets up on the support stock, and every stress sensor all disposes and connects a signal transmission module, and a plurality of signal transmission modules and wireless signal acquisition equipment communication connection, wireless signal acquisition equipment and remote computer communication connection.
2. The wireless transmission stress measurement system based on Lora according to claim 1, wherein the signal transmitting module comprises an electrical isolation unit, a signal amplifying unit, a main control unit A, a wireless transmitting unit and a data storage unit, wherein the electrical isolation unit is connected to a strain gauge of the stress sensor, the electrical isolation unit is connected with the main control unit A through the signal amplifying unit, and the main control unit A is connected with the wireless transmitting unit and the data storage unit;
the wireless signal acquisition equipment comprises a wireless receiving unit and a main control unit B, wherein the wireless receiving unit is in communication connection with the wireless transmitting unit, the wireless receiving unit is connected with the main control unit B, and the main control unit B is connected with a remote computer through an optical fiber network;
the signal transmitting module and the wireless signal acquisition equipment are realized through a Lora wireless acquisition and communication controller, and the Lora wireless acquisition and communication controller is used for data interval acquisition, storage and transmission and is internally provided with a lithium battery.
3. The Lora-based wireless transmission stress measurement system according to claim 1, wherein the upper computer software system comprises a parameter input and management module, a data acquisition module, a data storage module and a data processing module, wherein the parameter input and management module realizes the input of a strain gauge ID and the input of a sampling interval; the data acquisition module is divided into an upper computer acquisition part and a lower computer acquisition part, the upper computer acquisition part sends an acquisition instruction to the lower computer acquisition part through a USB port, and the lower computer acquisition part acquires data according to a certain time sequence according to the instruction, uploads the data according to a defined format and displays the data in real time; the data storage module is used for automatically storing the test data of each test working condition in a file and attaching a working parameter file for later analysis; and the data processing module performs conversion processing on the measurement data according to the standard.
4. The Lora-based wireless transmission stress measurement system according to claim 1, wherein the stress sensor is a steel bar stress sensor, the tensile stress range is 300Mpa, the compressive stress range is 100Mpa, the sampling rate is up to 1 s/time, the a/D resolution is 24 bits, the wireless communication distance is not less than 2km, and the wireless communication protocol is Lora wireless communication.
5. The Lora-based wireless transmission stress measurement system according to claim 2, wherein the master control unit a and the master control unit B are both MCUs, and the master control unit a performs analog-to-digital conversion, real-time storage and real-time wireless transmission; the main control unit B controls the wireless receiving unit to receive real-time data and transmits the real-time data to the upper computer software system through the USB interface so as to realize the display analysis of stress-strain data; the wireless receiving unit and the wireless transmitting unit are in communication connection with each other by adopting an ISM frequency band common to RF433 MHz.
6. The Lora-based wireless transmission stress measurement system of claim 2, wherein the strain gauge on the stress sensor is configured with a bridge excitation circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310448465.2A CN116448301A (en) | 2023-04-24 | 2023-04-24 | Wireless transmission stress measurement system based on Lora |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310448465.2A CN116448301A (en) | 2023-04-24 | 2023-04-24 | Wireless transmission stress measurement system based on Lora |
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