A piezoelectric impedance method concrete strength monitoring device

Abstract

The application relates to the technical field of concrete strength monitoring, in particular to a piezoelectric impedance method concrete strength monitoring device, which comprises wires, a plug and a PZT (Piezoelectric Transducer), one end of the wires is fixedly connected with the plug, the other end of the wires is fixedly connected with the PZT, an epoxy resin protective layer is fixedly connected with the outside of the wire and PZT connection position, the PZT is fixedly connected inside a mortar outer coating, a conical mortar block is fixedly connected at the bottom of the mortar outer coating, a hollow internal thread pipe is fixedly connected inside the mortar outer coating, and a hollow external thread pipe is spirally connected inside one end of the hollow internal thread pipe. In the application, the conical mortar block, the micro motor, the rotating shaft, the elastic sheet and the fixed plate are arranged, the whole device can vibrate in the process of concrete pouring, the structure of the conical mortar block can reduce the bubbles and gaps in the concrete around the monitoring device, and the accuracy of the monitoring data in the later period can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of concrete strength monitoring, in particular to a piezoelectric impedance method concrete strength monitoring device. BACKGROUND

[0002] The piezoelectric impedance method utilizes PZT to drive structure vibration and perceive the structure response under the vibration, when the impedance analyzer applies a sinusoidal alternating voltage to the PZT, the PZT as a driver vibrates according to the direction of the applied voltage and drives the structure to vibrate, and the structure vibration changes the original vibration behavior of the PZT, at this time, the PZT as a sensor receives the signal to express the difference between the two vibration responses by admittance or impedance, thus the relationship between the admittance, impedance and the structural damping, stiffness and strength related to the structural characteristic information can be established, so as to infer the internal performance change of the structure, the piezoelectric effect of the PZT can be used to monitor the strength change of the concrete, and in the actual application process, the frequency range with obvious peak value change of the electric conductance of the PZT before and after packaging is generally selected as the monitoring frequency range, and the frequency range with the most obvious peak value change of the electric conductance is 50-200 kHz, so as to take the frequency range as the main frequency range for monitoring the strength development of the concrete;

[0003] In the process of monitoring the strength of the concrete, if the initial and later strengths of the pouring are needed to be monitored, the monitoring device is pre-buried in the concrete pouring layer during the pouring process by the pre-buried method, generally the pre-buried is made by pouring the mortar outer layer on the outside of the PZT to make the aggregate, but in the pre-buried process, the aggregate around the concrete has more bubbles and gaps due to the need to avoid the damage of the aggregate caused by the vibration rod during the vibration process, so as to affect the accuracy of the monitoring data in the later period, therefore, the piezoelectric impedance method concrete strength monitoring device is provided for the above problems. SUMMARY

[0004] The present application aims to provide a piezoelectric impedance method concrete strength monitoring device to solve the problem that the aggregate around the concrete has more bubbles and gaps due to the damage of the aggregate caused by the vibration rod during the vibration process, so as to affect the accuracy of the monitoring data in the later period.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] The utility model provides a kind of piezoelectric impedance method concrete strength monitoring device, including wire, plug and PZT, one end of the wire and plug fixed connection, the wire other end and PZT fixed connection, epoxy resin protective layer is fixedly connected outside wire and PZT connection position, PZT is fixedly connected in mortar outer cladding inside, the bottom end of mortar outer cladding is fixedly connected with conical mortar block, the inside of hollow internal thread pipe inside fixedly connected with hollow external thread pipe, the inside of hollow external thread pipe one end spiral connection has hollow external thread pipe, the other end of hollow external thread pipe and sealing plate fixed connection, the other end of sealing plate and cover shell fixed connection, the inside of cover shell is equipped with micro motor, the top of micro motor main shaft is fixedly connected with rotating shaft, the top of rotating shaft is fixedly connected with fixed plate, the outside of fixed plate is equipped with elastic sheet.

[0007] Preferably, the inside of the hollow internal thread pipe and the hollow external thread pipe is fixedly connected with arc-shaped partition plate, the arc-shaped partition plate is provided with two, the arc-shaped partition plate is arranged in the same horizontal plane, and the hollow internal thread pipe and the hollow external thread pipe are coaxially arranged.

[0008] Preferably, the elastic sheet is provided with a plurality of elastic sheets, the elastic sheet is fixedly connected on the arc-shaped partition plate and the hollow internal thread pipe in a ring-shaped arrangement, one end of the fixed plate is arranged at a position between the elastic sheets, and the other end of the fixed plate is arranged outside the elastic sheets.

[0009] Preferably, the sealing plate is arranged in a ring shape, the sealing plate is fixedly connected with a sealing washer at one end, a threaded hole is formed in the inside of the sealing plate, the threaded hole is provided with two, the sealing plate is fixedly connected with the pouring mold plate through the threaded hole and the fixed bolt, a reserved hole is formed in the inside of the pouring mold plate, the vertical section of the reserved hole is equal in size to the vertical section of the cover shell, the pouring mold plate is slidably connected with the cover shell through the reserved hole, a fixed hole is formed in the inside of the pouring mold plate, the fixed hole is provided with two, and the fixed hole, the threaded hole and the fixed bolt are one-to-one corresponding.

[0010] Preferably, the mortar outer cladding, the conical mortar block and the PZT are coaxially arranged, and the mortar outer cladding and the PZT are centrally arranged.

[0011] Preferably, a clamping groove is formed in the inside of one end of the cover shell, a motor fixing block is clamped in the inside of the clamping groove, and the motor fixing block is fixedly connected with the micro motor at one end close to the central axis of the cover shell.

[0012] Preferably, the wire passes through the hollow internal thread pipe, the hollow external thread pipe, the sealing plate and the cover shell in sequence at the middle position, the wire is arranged on the side of the arc-shaped partition plate away from the rotating shaft, one end of the plug is fixedly connected with a sealing cover plate, and the vertical section of the sealing cover plate is arranged in a "T" shape.

[0013] Preferably, the wires are two, one end of the wires is fixedly connected with the upper and lower ends of the PZT respectively, the PZT is arranged in a circular plate shape, and half of the position where the wires contact the PZT is arranged inside the PZT.

[0014] Compared with the prior art, the present application has the following advantages:

[0015] 1、In the present application, the device as a whole is vibrated in the process of concrete pouring, and the structure of the conical mortar block can reduce the bubbles and gaps in the concrete around the monitoring device, thereby improving the accuracy of the monitoring data in the later period.

[0016] 2、In the present application, the micro motor can be disassembled for repeated use in the later period, and the sealing between the monitoring device and the formwork during the concrete pouring process and the sealing during the later use of the device can be ensured.

[0017] 3、In the present application, the epoxy resin protective layer and the PZT are arranged, which can effectively prevent the problem of rust at the contact position caused by the moisture return of the concrete poured wall in the later period, thereby improving the actual service life of the monitoring device and having good practical value. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 is a schematic diagram of the structure at A in the present application; Figure 1

[0020] Figure 3 is a schematic diagram of the PZT structure of the present application;

[0021] Figure 4 is a schematic diagram of the internal structure of the hollow internal thread pipe of the present application;

[0022] Figure 5 is a schematic diagram of the structure at B in the present application. Figure 4

[0023] ​​In the figure: 1-sand mortar outer cladding, 2-conical mortar block, 3-hollow inner threaded pipe, 4-hollow outer threaded pipe, 5-pouring formwork, 6-reserved hole, 7-fixing hole, 8-fixing bolt, 9-sealing plate, 10-sealing washer, 11-threaded hole, 12-enclosure, 13-motor fixing block, 14-micro motor, 15-clamping groove, 16-wire, 17-sealing cover plate, 18-plug, 19-epoxy resin protective layer, 20-PZT, 21-arc-shaped partition plate, 22-rotating shaft, 23-elastic sheet, 24-fixing plate. DETAILED DESCRIPTION

[0024] Referring to Figures 1-5 , the present application provides a technical solution:

[0025] A piezoelectric impedance method concrete strength monitoring device, comprising a wire 16, a plug 18 and a PZT 20, one end of the wire 16 is fixedly connected with the plug 18, the other end of the wire 16 is fixedly connected with the PZT 20, an epoxy resin protective layer 19 is fixedly connected outside the connection position of the wire 16 and the PZT 20, the PZT 20 is fixedly connected inside the sand mortar outer cladding 1, a conical mortar block 2 is fixedly connected at the bottom end of the sand mortar outer cladding 1, a hollow inner threaded pipe 3 is fixedly connected inside the sand mortar outer cladding 1, a hollow outer threaded pipe 4 is spirally connected inside one end of the hollow inner threaded pipe 3, the other end of the hollow outer threaded pipe 4 is fixedly connected with the sealing plate 9, the other end of the sealing plate 9 is fixedly connected with the enclosure 12, a micro motor 14 is arranged inside the enclosure 12, a rotating shaft 22 is fixedly connected at the top end of the main shaft of the micro motor 14, a fixing plate 24 is fixedly connected at the top end of the rotating shaft 22, and the elastic sheet 23 is arranged outside the fixing plate 24.

[0026] Referring to Figure 4 and Figure 5 , the arc-shaped partition plates 21 are fixedly connected inside the hollow inner threaded pipe 3 and the hollow outer threaded pipe 4, the arc-shaped partition plates 21 are provided in two, the arc-shaped partition plates 21 are arranged on the same horizontal plane, the hollow inner threaded pipe 3 and the hollow outer threaded pipe 4 are coaxially arranged, which can prevent the wire 16 and the rotating shaft 22 from being in contact during the actual application of the monitoring device, thereby preventing the problem of excessive wear of the wire 16; the elastic sheet 23 is provided in a plurality of, the elastic sheet 23 is fixedly connected in a ring-shaped arrangement on the arc-shaped partition plate 21 and the hollow inner threaded pipe 3, one end of the fixing plate 24 is arranged at a position between the elastic sheets 23, and the other end of the fixing plate 24 is arranged outside the elastic sheets 23, the fixing plate 24 can be continuously knocked against the elastic sheet 23 by driving the fixing plate 24 through the rotating shaft 22, thereby causing the monitoring device to vibrate during the pouring of the concrete, which can prevent the concrete around the monitoring device from having bubbles and gaps, and effectively improves the accuracy of the monitoring data in the later stage.

[0027] Referring to Figures 1-3The sealing plate 9 is annularly arranged, one end of the sealing plate 9 is fixedly connected with a sealing gasket 10, a threaded hole 11 is formed in the inner side of the sealing plate 9, the threaded hole 11 is provided with two, the sealing plate 9 is fixedly connected with the pouring formwork 5 through the threaded hole 11 and the fixing bolt 8, a reserved hole 6 is formed in the inner side of the pouring formwork 5, the vertical section of the reserved hole 6 is equal to the vertical section of the cover shell 12, the pouring formwork 5 is slidably connected with the cover shell 12 through the reserved hole 6, a fixing hole 7 is formed in the inner side of the pouring formwork 5, the fixing hole 7 is provided with two, the fixing hole 7, the threaded hole 11 and the fixing bolt 8 are one-to-one corresponding, such arrangement can fix the monitoring device on the pouring formwork 5 for positioning in the actual pre-embedded installation process; the mortar outer cladding 1, the conical mortar block 2 and the PZT 20 are coaxially arranged, the mortar outer cladding 1 and the PZT 20 are coaxially arranged, which further improves the stability of the overall structure of the monitoring device; a clamping groove 15 is formed in the inner side of one end of the cover shell 12, a motor fixing block 13 is clamped in the inner side of the clamping groove 15, the motor fixing block 13 is fixedly connected with a micro motor 14 at the end close to the central axis of the cover shell 12, which facilitates the disassembly of the micro motor 14 in the later period;

[0028] Specifically refer to Figures 1-5 The middle position of the wire 16 passes through the hollow inner threaded pipe 3, the hollow outer threaded pipe 4, the sealing plate 9 and the cover shell 12 in sequence, and the wire 16 is arranged on the side of the arc-shaped partition plate 21 away from the rotating shaft 22, the plug 18 is fixedly connected with the sealing cover plate 17 at one end, and the vertical section of the sealing cover plate 17 is arranged in a "T" shape, which can well protect the wire 16; the wire 16 has two, one end of the wire 16 is fixedly connected with the upper and lower ends of the PZT 20, the PZT 20 is arranged in a circular plate shape, and the position where the wire 16 and the PZT 20 contact is arranged on the inner side of the PZT 20 by half, which can stably connect the wire 16 and the PZT 20 together.

[0029] Work flow: in the process of monitoring the strength of concrete by using a kind of piezoelectric impedance method concrete strength monitoring device, especially in the process of monitoring by embedding the monitoring device in the concrete pouring layer: first, the staff needs to install the monitoring device on the pouring formwork 5 according to the actual situation and the needs of measurement, and fix it, in the process of fixing, the fixing bolt 8 is screwed through the fixing hole 7 and the threaded hole 11, which can tightly connect the sealing plate 9 and the pouring formwork 5, and then the cover shell 12 can be fixed, after the cover shell 12 is fixed, the mortar outer cladding 1 can be positioned through the hollow inner threaded pipe 3 and the hollow outer threaded pipe 4, and the positioning of the PZT 20 is completed after the positioning of the mortar outer cladding 1 is completed;

[0030] Then the staff can pour concrete to monitor the whole pre-burying process, the staff can install a micro motor 14 in the shell 12 during the pouring process, the micro motor 14 is installed, and the micro motor 14 is controlled by an external power supply to drive the rotating shaft 22 to rotate, the rotating shaft 22 will drive the fixed plate 24 to rotate during rotation, the fixed plate 24 will continuously hit the elastic sheet 23 during rotation, thereby the whole monitoring device can vibrate, the tapered mortar block 2 fixedly connected at the bottom of the mortar outer cover 1 can prevent the concrete around the monitoring device from having many bubbles and large voids, thereby the accuracy of the monitoring device in the later monitoring can be improved;

[0031] After the concrete is poured, the plug 18 and the controller are connected during the concrete setting stage, thereby the setting degree of the concrete can be monitored in real time, the next process can be carried out after the concrete strength reaches the design standard, thereby the construction progress can be accelerated within the safe range, and the concrete pouring project can be monitored in the later period, which is of great significance for improving the concrete strength monitoring system, perfecting the concrete strength monitoring system, and promoting the sustainable development of social economy.

[0032] The principles and embodiments of the present application are described in this paper by applying specific examples, and the above examples are only used to help understand the method of the present application and its core idea. The above description is only the preferred embodiment of the present application, and it should be pointed out that due to the limitation of language expression, there are infinite specific structures, and for ordinary technical personnel in this technical field, some improvements, decorations or changes can be made without departing from the principles of the present application, and the above technical features can be combined in an appropriate way; these improvements, decorations, changes or combinations, or the direct application of the inventive concept and technical scheme to other occasions without improvement, shall be regarded as the protection scope of the present application.

Claims

1. A piezoelectric impedance method concrete strength monitoring device comprising a lead wire (16), a plug (18) and a PZT (20), characterized in that: One end of the lead wire (16) is fixedly connected with the plug (18), the other end of the lead wire (16) is fixedly connected with the PZT (20), the outer side of the connecting position of the lead wire (16) and the PZT (20) is fixedly connected with an epoxy resin protective layer (19), the PZT (20) is fixedly connected to the inner side of the mortar outer cladding (1), the bottom end of the mortar outer cladding (1) is fixedly connected with a conical mortar block (2), the inner side of the mortar outer cladding (1) is fixedly connected with a hollow inner threaded pipe (3), the inner side of one end of the hollow inner threaded pipe (3) is spirally connected with a hollow outer threaded pipe (4), the other end of the hollow outer threaded pipe (4) is fixedly connected with a sealing plate (9), the other end of the sealing plate (9) is fixedly connected with a cover shell (12), the inner side of the cover shell (12) is provided with a micro motor (14), the top end of the main shaft of the micro motor (14) is fixedly connected with a rotating shaft (22), the top end of the rotating shaft (22) is fixedly connected with a fixed plate (24), the outer side of the fixed plate (24) is provided with an elastic sheet (23); the inner sides of the hollow inner threaded pipe (3) and the hollow outer threaded pipe (4) are fixedly connected with arc-shaped partition plates (21), the arc-shaped partition plates (21) are provided with two, the arc-shaped partition plates (21) are arranged on the same horizontal plane, and the hollow inner threaded pipe (3) and the hollow outer threaded pipe (4) are coaxially arranged.

2. The piezoelectric impedance method-based concrete strength monitoring device according to claim 1, characterized in that: The elastic sheet (23) is provided with a plurality of, the elastic sheet (23) is fixedly connected in an annular arrangement on the arc-shaped partition plate (21) and the hollow inner threaded pipe (3), one end of the fixed plate (24) is arranged at a position between the elastic sheets (23), and the other end of the fixed plate (24) is arranged on the outer side of the elastic sheet (23).

3. The piezoelectric impedance-based concrete strength monitoring device of claim 1, wherein: The sealing plate (9) is arranged in an annular shape, one end of the sealing plate (9) is fixedly connected with a sealing gasket (10), the inner side of the sealing plate (9) is provided with threaded holes (11), the threaded holes (11) are provided with two, the sealing plate (9) is fixedly connected with the pouring mold plate (5) through the threaded holes (11) and fixed bolts (8), the inner side of the pouring mold plate (5) is provided with a reserved hole (6), the vertical section of the reserved hole (6) is equal in size to the vertical section of the cover shell (12), the pouring mold plate (5) is slidably connected with the cover shell (12) through the reserved hole (6), the inner side of the pouring mold plate (5) is provided with fixed holes (7), the fixed holes (7) are provided with two, and the fixed holes (7), the threaded holes (11) and the fixed bolts (8) are one-to-one corresponding.

4. The piezoelectric impedance-based concrete strength monitoring device of claim 1, wherein: The mortar outer cladding (1), the conical mortar block (2) and the PZT (20) are coaxially arranged, and the mortar outer cladding (1) and the PZT (20) are centrally arranged.

5. The piezoelectric impedance-based concrete strength monitoring device of claim 1, wherein: One end of the cover shell (12) is provided with a clamping groove (15) in the inner side, the clamping groove (15) is clamped with a motor fixed block (13), and one end of the motor fixed block (13) close to the central axis of the cover shell (12) is fixedly connected with the micro motor (14).

6. The piezoelectric impedance method-based concrete strength monitoring device according to claim 1, wherein: The middle position of the wire (16) passes through hollow inner threaded pipe (3), hollow outer threaded pipe (4), sealing plate (9) and cover (12) in turn, and the wire (16) is arranged on the side of the arc-shaped partition plate (21) away from the rotating shaft (22), one end of the plug (18) is fixedly connected with the sealing cover plate (17), and the vertical section of the sealing cover plate (17) is arranged in a T shape.

7. The piezoelectric impedance-based concrete strength monitoring device of claim 1, wherein: The wire (16) is shared by two, one end of the wire (16) is fixedly connected with the upper and lower ends of the PZT (20) respectively, the PZT (20) is arranged in a circular plate shape, and half of the position where the wire (16) and the PZT (20) contact is arranged on the inner side of the PZT (20).

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