CN212255335U - In-situ freezing and thawing damage monitoring device for underwater concrete member - Google Patents
In-situ freezing and thawing damage monitoring device for underwater concrete member Download PDFInfo
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- CN212255335U CN212255335U CN202021837906.6U CN202021837906U CN212255335U CN 212255335 U CN212255335 U CN 212255335U CN 202021837906 U CN202021837906 U CN 202021837906U CN 212255335 U CN212255335 U CN 212255335U
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Abstract
The utility model belongs to the technical field of concrete structure durability monitoring, a concrete member freeze thawing damage normal position monitoring devices under water is related to, major structure includes the upper connecting rod, the concrete member, horizontal seal box, vertical seal box, the mobile guide pole, probe launching box, multichannel data collection station, the frequency modulation transmitter, a computer, the auxiliary wheel, lower connecting rod and wireless temperature sensor, the probe transmits the acceleration data that record to multichannel data collection station after through frequency modulation signal transmitter real-time transmission for the computer, the computer is according to the change relation of probe striking concrete member in-process acceleration along with time, obtain the elastic modulus of concrete member via the computational formula, and draw the elastic modulus change curve of concrete member in real time, the probe that can reciprocate, be convenient for monitor the elastic modulus at different positions of concrete member, simple has been realized, The elastic modulus of the underwater concrete member is rapidly, accurately and continuously measured.
Description
The technical field is as follows:
the utility model belongs to the technical field of concrete structure durability monitoring, a concrete member freeze thawing damage normal position monitoring devices under water is related to, through the elastic modulus of monitoring concrete member under water, carries out the normal position aassessment to the freeze thawing damage of concrete member under water.
Background art:
in cold regions or freeze-thaw environments, water in pores inside the concrete member generates frost heaving stress due to freezing, so that the concrete member is damaged to different degrees, and the safety and the durability are adversely affected. In the prior art, the device and the method for testing the elasticity modulus of the concrete member on site are mainly applicable to the concrete member on land, such as: the device for measuring the elastic modulus of the concrete with the leveling, disclosed by the Chinese patent 201710222638.3, comprises an upper ring and a lower ring, wherein the upper ring and the lower ring are arranged up and down, and the upper ring and the lower ring are provided with fastening devices for fixing the concrete to be measured; the upper ring is also provided with a circular level, a positioning plate is fixed between the upper ring and the lower ring, and the positioning plate is used for fixing the distance between the upper ring and the lower ring; a dial indicator bracket is arranged on the upper ring, a contact rod is arranged on the lower ring, and a dial indicator is arranged between the dial indicator bracket and the contact rod; the elastic modulus value of the concrete is calculated through the micro-deformation amount between the fixing frames. Chinese patent 201810780463.2 discloses a portable dynamic elastic modulus tester controlled by a mobile terminal, which includes: host computer, transmitter and receiver, the host computer includes broadcast module, equipment connection module, treater and lithium ion battery, the host computer is the cuboid, host computer internally mounted broadcast module, equipment connection module, treater and lithium ion battery, transmitter and receiver are outside at the host computer, and transmitter and receiver pass through the cable with the host computer and are connected, and mobile terminal carries out one-to-one with the equipment connection module of the device and carries out two-way wireless communication through broadcast module. The equipment connection module is used for sending the device identification information to the target mobile terminal before the broadcast module broadcasts, so that the mobile terminal can accurately and quickly control the device. The broadcast module is used for transmitting the information of the mobile terminal and the device. The processor is used for controlling the on-off and adjustment of the transmitter and the receiver, simultaneously carrying out digital signal conversion on information received by the broadcasting module, transmitting the signal to the transmitter, transmitting the detected signal to the processor by the receiver, and converting the signal by the processor and transmitting the converted signal to the mobile terminal through the broadcasting module. The mobile terminal is used for controlling the device, calculating data and displaying results, wherein the calculation of the data and the display of the results means that the mobile terminal performs a series of calculations such as Fourier transform and the like on received data through a processor of the mobile terminal to obtain resonance frequency, displays a spectrogram of real-time frequency and current amplitude frequency under the current frequency, and automatically displays the resonance frequency and calculates the dynamic elasticity modulus after scanning is finished. The mobile terminal can control the device by downloading a social client or an offline app; the resonance frequency is obtained by measuring the frequency and the amplitude of the test piece and performing a series of calculations such as Fourier transform, and the dynamic elastic modulus is calculated by utilizing the resonance frequency. However, the underwater concrete member is in a low-temperature and high-pressure environment for a long time, and is more easily subjected to freeze-thaw damage compared with a concrete member on the land, and the current elastic modulus testing device cannot play a role in the underwater special environment, so that the mechanical property of the underwater concrete member is tested in the manner of underwater coring by divers and elastic modulus on the land at the present stage, which not only brings a certain life risk to underwater operators, but also the obtained elastic modulus testing result is limited by factors such as season, temperature, time and economic conditions, and has no continuity and representativeness, and the degree of freeze-thaw damage of the concrete member cannot be accurately evaluated. Therefore, the in-situ elastic modulus test of the built underwater concrete member to evaluate the freeze-thaw damage degree of the underwater concrete member has very important significance.
The utility model has the following contents:
the utility model aims to overcome the shortcoming that the concrete member freeze thawing damage under water of unable real-time, continuous normal position monitoring that prior art exists, seek to design a normal position monitoring devices based on elastic modulus's concrete member freeze thawing damage under water.
In order to achieve the purpose, the main structure of the in-situ freezing and thawing damage monitoring device for the underwater concrete member comprises an upper connecting rod, a concrete member, a transverse sealing box, a longitudinal sealing box, a movable guide rod, a probe transmitting box, a multi-channel data acquisition unit, a frequency modulation transmitter, a computer, an auxiliary wheel, a lower connecting rod and a wireless temperature sensor; one end of the upper connecting rod is connected with the concrete member, the other end of the upper connecting rod is connected with the transverse sealing box, the transverse sealing box is respectively connected with the longitudinal sealing box and the movable guide rod, the longitudinal sealing box is connected with the probe transmitting box through a secondary pulley arranged in the longitudinal sealing box, the probe transmitting box is connected with the multi-channel data collector, the multi-channel data collector is connected with the computer through a frequency modulation transmitter, the movable guide rod penetrates through two rows of auxiliary wheels arranged on the probe transmitting box and is connected with one end of the lower connecting rod, the other end of the lower connecting rod is connected with the concrete member, and the lower connecting rod is provided with a wireless temperature sensor; and the computer is respectively connected with the transverse sealing box, the probe transmitting box and the wireless temperature sensor.
The utility model relates to a be provided with waterproof power supply and dive motor in the transverse seal case, waterproof power supply and dive motor are connected through wireless switch, are provided with head pulley, reel and leading wheel on the dive motor.
The utility model relates to a drive chain is connected with main pulley, reel and secondary pulley through the leading wheel in proper order.
The utility model relates to an inside of probe transmission case is provided with No. two waterproof power supplies and spring assembly, No. two waterproof power supplies are connected with the electro-magnet through No. two wireless switches, the spring assembly is connected with the steel sheet frame, the left end of steel sheet frame is provided with the iron plate, the right-hand member of steel sheet frame is provided with magnet No. one, the tip of probe transmission case is provided with the pipe of cavity formula structure, the inner of pipe is provided with magnet No. two, the outer end of pipe is provided with the pulley, be provided with the transmission guide arm in the pipe, be provided with the sealing rubber circle between pipe and the transmission guide arm, the tip of transmission guide arm is.
The utility model relates to an upper connecting rod and concrete component and transverse seal box, lower connecting rod and concrete component and movement guide arm and probe launching box and auxiliary wheel are all connected through locknut, the transverse seal box and probe launching box and locknut and between probe launching box and secondary pulley are all sealed, has good waterproof effect; the transverse sealing box, the longitudinal sealing box and the probe launching box are electric sealing boxes made of stainless steel with the thickness of 5 mm; the upper connecting rod and the lower connecting rod are seamless steel tubes with the outer diameter of 15mm and the inner diameter of 8mm, so that the upper connecting rod and the lower connecting rod are uniformly stressed and the dead weight can be reduced; the multi-channel data acquisition unit is electrically connected with the probe; the frequency modulation transmitter is a bidirectional frequency modulation transmitter; the first waterproof power supply and the second waterproof power supply are both lithium batteries; the wireless temperature sensor can monitor the water temperature in real time to reflect whether the concrete member is in a freeze-thaw state or not; the submersible motor is an oil-filled submersible motor; the first magnet and the second magnet are N magnets with strong force; the probe is an acceleration type probe.
Compared with the prior art, the utility model, the acceleration data that the probe will record transmit for the computer through the frequency modulation signal transmitter real-time transmission after the multichannel data collection station, the computer is according to the change relation of acceleration along with time in the probe striking concrete member process, obtain the elastic modulus of concrete member via the computational formula, and draw the elastic modulus change curve of concrete member in real time, the probe that can reciprocate, be convenient for monitor the elastic modulus at different positions of concrete member, the elastic modulus of measuring the concrete member under water has simply been realized, fast, accurately, continuously; its simple structure, convenient operation, can reuse, the transmission that adopts homopolar high-strength magnet to pass power through the non-contact provides power for the probe through the mode of non-contact, has solved sealed problem, the elastic modulus of concrete member is calculated to the acceleration data that obtains through the probe, and then obtains the loss of elastic modulus, carries out real-time normal position monitoring to the freeze-thaw damage of concrete member under water, it is big to have solved the freeze-thaw damage monitoring of concrete member under water problem such as with high costs, danger coefficient is high, data discontinuity, the error that has avoided the artificial reading to cause.
Description of the drawings:
fig. 1 is a schematic diagram of the main structure principle of the present invention.
Fig. 2 is a schematic view of a partial structure of the present invention.
Fig. 3 is a schematic view of the internal structure of the probe launching box according to the present invention.
Fig. 4 is a schematic diagram of the data transmission principle of the present invention.
The specific implementation mode is as follows:
the invention will be further described by means of an embodiment example in conjunction with the accompanying drawings.
Example 1:
the main structure of the freeze-thaw damage in-situ monitoring device for the underwater concrete member comprises an upper connecting rod 1, a concrete member 2, a transverse sealing box 3, a longitudinal sealing box 4, a movable guide rod 5, a probe transmitting box 6, a multi-channel data collector 7, a frequency modulation transmitter 8, a computer 9, an auxiliary wheel 10, a lower connecting rod 11, a wireless temperature sensor 12, a transmission chain 13, a locknut 14, a first waterproof power supply 31, a submersible motor 32, a first wireless switch 33, a main pulley 34, a winding drum 35, a guide wheel 36, a secondary pulley 41, a second waterproof power supply 601, a spring set 602, a second wireless switch 603, an electromagnet 604, a steel plate frame 605, an iron block 606, a first magnet 607, a guide pipe 608, a second magnet 609, a pulley 610, a transmitting guide rod 611, a sealing rubber ring 612 and a probe 613; one end of an upper connecting rod 1 with an internal hollow tubular structure is connected with a concrete member 2 of an underwater structure, the other end of the upper connecting rod is connected with a transverse sealing box 3 with a cuboid structure, the transverse sealing box 3 is respectively connected with a longitudinal sealing box 4 with the cuboid structure and a moving guide rod 5 with the internal hollow structure, a waterproof power supply 31 and a diving motor 32 are arranged in the transverse sealing box 3, the waterproof power supply 31 and the diving motor 32 are connected through a wireless switch 33, the diving motor 32 is provided with a main pulley 34 with a circular structure, a winding drum 35 and a guide wheel 36, a secondary pulley 41 with a circular structure is arranged in the longitudinal sealing box 4, a transmission chain 13 is sequentially connected with the main pulley 34, the winding drum 35 and the secondary pulley 41 through the guide wheel 36 to form a closed loop, the longitudinal sealing box 4 is connected with a probe launching box 6 with the cuboid structure, a second waterproof power supply 601 and a spring group 602 consisting of four springs are arranged in the probe launching, the second waterproof power supply 601 is connected with an electromagnet 604 through a second wireless switch 603, a spring group 602 is sleeved inside a steel plate frame 605, the left end of the steel plate frame 605 is provided with an iron block 606, the right end of the steel plate frame 605 is provided with a first magnet 607, the end part of the probe launching box 6 is provided with a guide pipe 608 with an inner hollow structure, the inner end of the guide pipe 608 is provided with a second magnet 609, the outer end of the guide pipe 608 is provided with a pulley 610, a launching guide rod 611 is arranged in the guide pipe 608, a sealing rubber ring 612 is arranged between the guide pipe 608 and the launching guide rod 611, the end part of the launching guide rod 611 is provided with a probe 613, the probe launching box 6 is connected with a multi-channel data collector 7, the multi-channel data collector 7 is connected with a computer 9 through a frequency modulation transmitter 8, a movable guide rod 5 passes through an auxiliary wheel 10 arranged on the probe launching box 6 and is connected, a wireless temperature sensor 12 is arranged on the lower connecting rod 11, and the computer 9 is respectively connected with the transverse sealing box 3, the probe transmitting box 6 and the wireless temperature sensor 12; the upper connecting rod 1 and the concrete member 2 and the transverse sealing box 3, the lower connecting rod 11 and the concrete member 2 and the moving guide rod 5, and the probe launching box 6 and the auxiliary wheel 10 are connected through locknuts 14; the multi-channel data collector 7 is electrically connected to the probe 613.
When the in-situ freeze-thaw damage monitoring device for the underwater concrete member related to the embodiment is used, the electromagnet 604 is electrified to attract the iron block 606, the steel plate frame 605 compresses the spring group 602, after the electromagnet 604 is powered off, the magnetic force disappears, the spring group 602 recovers to the original state to drive the steel plate frame 605 to move right rapidly, so that the first magnet 607 and the second magnet 609 repel each other, and the repulsive force launches the probe 613 to the concrete member 2 through the launching guide rod 611 to generate impact.
The upper connecting rod 1 and the lower connecting rod 11 related to the embodiment are in lossless connection with the concrete member 2, so that the integrity of the concrete member 2 is ensured; a main pulley 34 on the submersible motor 32 is connected with a secondary pulley 41 on the probe launching box 6, and the moving guide rod 5 is contacted with an auxiliary wheel 10 on the probe launching box 6, so that the probe 613 can move up and down smoothly; the probe 613 is connected with the multi-channel data collector 7, the multi-channel data collector 7 is connected with the frequency modulation transmitter 8, and the frequency modulation transmitter 8 is connected with the computer 9, so that data acquired by the probe 613 can be rapidly transmitted to the computer 9.
Example 2:
the in-situ freezing and thawing damage monitoring method for the underwater concrete member according to the embodiment is used for monitoring a certain underwater concrete member 2, when the wireless temperature sensor 12 displays that the underwater temperature is higher than 0 ℃, the water temperature is uploaded to the computer 9, the computer 9 turns on the first wireless switch 33, the submersible motor 32 drives the main pulley 34 to rotate, the winding drum 35 collects the transmission chain 13 transmitted by the main pulley 34, the transmission chain 13 drives the probe launching box 6 to move upwards through the secondary pulley 41, the probe 613 is positioned at the upper end of the concrete member 2, meanwhile, the computer 9 turns on the second wireless switch 603, the electromagnet 604 is electrified and generates magnetism, the iron block 606 is attracted to the electromagnet 604, the steel plate frame 605 moves to the left, the spring group 602 is compressed, the computer 9 turns off the second wireless switch 603, the magnetism of the electromagnet 604 disappears, the iron block 606 is released, and the steel plate frame 605 moves to the right in the process of recovering the original shape of the spring group 602, repulsive force is generated between the first magnet 607 and the second magnet 609, the repulsive force pushes the launching guide rod 611 out, and the probe 613 impacts the concrete member 2; the concrete member 2 is monitored once every 20cm, the multichannel collector 7 transmits the collected data of the speed of the probe 613 impacting the concrete member 2 and the collision duration to the computer 9 through the frequency modulation transmitter 8, the computer 9 draws the change curve of the elastic modulus of the concrete member 2 in real time through Matlab (matrix laboratory) and Origin (function drawing software), analyzes the change rule of the elastic modulus along with time, and judges whether the concrete member 2 is damaged by freezing and thawing according to the principle that whether the loss rate of the elastic modulus reaches 60%.
Claims (4)
1. An in-situ freezing and thawing damage monitoring device for an underwater concrete member is characterized in that a main structure comprises an upper connecting rod, the concrete member, a transverse sealing box, a longitudinal sealing box, a movable guide rod, a probe transmitting box, a multi-channel data acquisition unit, a frequency modulation transmitter, a computer, auxiliary wheels, a lower connecting rod and a wireless temperature sensor; one end of the upper connecting rod is connected with the concrete member, the other end of the upper connecting rod is connected with the transverse sealing box, the transverse sealing box is respectively connected with the longitudinal sealing box and the movable guide rod, the longitudinal sealing box is connected with the probe transmitting box through a secondary pulley arranged in the longitudinal sealing box, the probe transmitting box is connected with the multi-channel data collector, the multi-channel data collector is connected with the computer through a frequency modulation transmitter, the movable guide rod penetrates through two rows of auxiliary wheels arranged on the probe transmitting box and is connected with one end of the lower connecting rod, the other end of the lower connecting rod is connected with the concrete member, and the lower connecting rod is provided with a wireless temperature sensor; and the computer is respectively connected with the transverse sealing box, the probe transmitting box and the wireless temperature sensor.
2. The in-situ freeze-thaw damage monitoring device for the underwater concrete member as claimed in claim 1, wherein a first waterproof power supply and a submersible motor are arranged in the transverse sealing box, the first waterproof power supply and the submersible motor are connected through a first wireless switch, and a main pulley, a winding drum and a guide wheel are arranged on the submersible motor.
3. The in-situ freeze-thaw damage monitoring device for the underwater concrete member according to claim 2, wherein the transmission chain is connected with the main pulley, the winding drum and the secondary pulley in sequence through the guide wheel.
4. The in-situ freeze-thaw damage monitoring device for the underwater concrete member as claimed in claim 3, wherein a second waterproof power supply and a spring set are arranged inside the probe launching box, the second waterproof power supply is connected with the electromagnet through a second wireless switch, the spring set is connected with the steel plate frame, an iron block is arranged at the left end of the steel plate frame, a first magnet is arranged at the right end of the steel plate frame, a guide pipe with an inner hollow structure is arranged at the end of the probe launching box, a second magnet is arranged at the inner end of the guide pipe, a pulley is arranged at the outer end of the guide pipe, a launching guide rod is arranged in the guide pipe, a sealing rubber ring is arranged between the guide pipe and the launching guide rod, and a probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021837906.6U CN212255335U (en) | 2020-08-28 | 2020-08-28 | In-situ freezing and thawing damage monitoring device for underwater concrete member |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021837906.6U CN212255335U (en) | 2020-08-28 | 2020-08-28 | In-situ freezing and thawing damage monitoring device for underwater concrete member |
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| CN212255335U true CN212255335U (en) | 2020-12-29 |
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| CN202021837906.6U Active CN212255335U (en) | 2020-08-28 | 2020-08-28 | In-situ freezing and thawing damage monitoring device for underwater concrete member |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022041660A1 (en) * | 2020-08-28 | 2022-03-03 | 青岛理工大学 | Freeze-thaw damage in situ monitoring device and method for underwater concrete member |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022041660A1 (en) * | 2020-08-28 | 2022-03-03 | 青岛理工大学 | Freeze-thaw damage in situ monitoring device and method for underwater concrete member |
| US11946923B2 (en) | 2020-08-28 | 2024-04-02 | Qingdao university of technology | Device and method for monitoring freezing-thawing damage of underwater concrete member in situ |
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