Concrete crack resistance detection device for building civil engineering

Abstract

The invention discloses a concrete crack resistance detection device for building civil engineering, and relates to the technical field of concrete performance detection.The concrete crack resistance detection device comprises a base, the upper surface of the base is sunken downwards to form a mounting groove, and the middle of the mounting groove is sunken downwards to form a first image acquisition chamber; the transparent aluminum oxide objective table is arranged in the mounting groove, and the concrete sample is arranged on the transparent aluminum oxide objective table; the first camera is arranged in the first image acquisition chamber, the image acquisition end of the first camera faces the transparent aluminum oxide objective table, and the first camera can acquire an image of the lower surface of the concrete sample; the heating mechanism is arranged in the transparent aluminum oxide objective table and / or on the lower surface of the transparent aluminum oxide objective table, and the heating mechanism is used for heating the sample to a target temperature; a pressing plate is arranged at the end of a telescopic rod of the hydraulic press, and the hydraulic press applies pressure to the upper surface of the sample through the pressing plate. Different stress conditions and different temperature and humidity environments can be accurately simulated, the cracking condition of the sample can be comprehensively observed, and large-batch tests can be carried out.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete performance detection, and particularly to a device for detecting the crack resistance of concrete used in building civil engineering. Background Art

[0002] In building civil engineering, concrete is a composite material formed by the hydration reaction of cement, water, aggregates (sand, stone), and additives. It has the characteristics of high compressive strength, strong plasticity, and low cost, and is widely used in engineering fields such as buildings, bridges, and roads. However, concrete is prone to cracking under the action of factors such as load, temperature, and humidity changes. Cracks will lead to a decrease in the safety of the concrete structure, a reduction in durability, and damage to functionality. Therefore, it is necessary to simulate the performance of concrete under different stress, temperature, and humidity conditions to evaluate its ability to resist cracking.

[0003] The existing detection devices have the following deficiencies:

[0004] 1. It can only simulate different stress conditions and cannot accurately simulate the temperature and humidity environment. For temperature simulation, since the specimen is under compressive stress, it is impossible to normally arrange heating equipment (which may cause damage to the heating equipment), and heating chambers such as aging rooms cannot accurately heat the specimen to the preset temperature. For humidity simulation, it is difficult to couple the humidity adjustment device with pressure application equipment such as hydraulic cylinders. Only by arranging the humidity adjustment device in a large-area chamber and conducting tests in the large-area chamber, but the humidity control of the large-area chamber is difficult and the control accuracy is low.

[0005] 2. The tests are generally divided into multiple groups, and the required environments for each group are different. The existing equipment has fixed simulated environmental parameters and cannot meet the requirements of batch tests.

[0006] 3. When the specimen is under pressure, the upper surface of the specimen is in contact with the hydraulic cylinder, and the lower surface is in contact with the test platform. Therefore, the existing technology can only observe the cracking situation on the side of the specimen, and the test results are not accurate enough.

[0007] In view of this, how to provide a device for detecting the crack resistance of concrete that can accurately simulate different stress conditions and different temperature and humidity environments, comprehensively observe the cracking situation of the specimen, and be able to conduct a large number of tests is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0008] The purpose of the present invention is to provide a device for detecting the crack resistance of concrete used in building civil engineering to solve the problems existing in the prior art.

[0009] To achieve the above purpose, the present invention provides a device for detecting the crack resistance of concrete used in building civil engineering, including:

[0010] A base, on whose upper surface a downward depression forms a mounting groove, and a middle part of the mounting groove forms a downward depression to form a first image acquisition chamber;

[0011] A transparent alumina stage, disposed in the mounting groove, on which a concrete specimen is arranged;

[0012] A first camera, disposed in the first image acquisition chamber, whose image acquisition end faces the transparent alumina stage and can acquire an image of the lower surface of the concrete specimen;

[0013] A heating mechanism, disposed inside the transparent alumina stage and / or on the lower surface of the transparent alumina stage, which is used to heat the specimen to a target temperature;

[0014] A hydraulic press, at the end of whose telescopic rod a pressing plate is provided, and the hydraulic press presses on the upper surface of the specimen through the pressing plate.

[0015] Furthermore, it further includes:

[0016] A pressure sensor, the mounting groove defines support platforms on the left and right sides of the first image acquisition chamber, the pressure sensor is disposed on the support platforms, and the lower surface of the transparent alumina stage is in contact with the pressure sensor.

[0017] Furthermore, the heating mechanism includes:

[0018] A heating pipe, the area of the transparent alumina stage corresponding to the support platform is a support area, and the area corresponding to the first image acquisition chamber is an acquisition area, and the heating pipe is embedded in the support area.

[0019] Furthermore, the heating mechanism further includes:

[0020] A transparent conductive film, disposed on the lower surface of the acquisition area and electrically connected to an external power supply;

[0021] A temperature sensor, disposed on the base and connected to the specimen through an induction wire, and the temperature sensor is used to monitor the temperature of the specimen;

[0022] A controller, electrically connected to the heating pipe and the transparent conductive film, and the controller is used to adjust the heating temperature of the transparent conductive film and the heating pipe.

[0023] Furthermore, it further includes:

[0024] A humidity adjustment chamber, disposed on the base, the specimen is located inside the humidity adjustment chamber, and the humidity adjustment chamber can adjust the internal humidity; an inlet is opened at the top of the humidity adjustment chamber, and the inlet corresponds to the specimen;

[0025] A plurality of sector-shaped elastic retaining rods, one end of which is fixedly connected to the inner edge of the inlet, and the other end extends towards the center of the inlet. The inlet is a circular hole, and the plurality of sector-shaped elastic retaining rods are arranged in sequence along the circumferential direction to form an elastic baffle that fits the shape of the inlet. The sector-shaped elastic retaining rods have an upward elastic tendency and can close the inlet;

[0026] A second image acquisition chamber, which is arranged below the pressing plate, and a transparent contact plate is arranged at the bottom of the second image acquisition chamber;

[0027] A second camera, which is arranged in the second image acquisition chamber, and its image acquisition end corresponds to the transparent contact plate. The second camera is used to acquire an image of the upper surface of the concrete specimen;

[0028] The transparent contact plate corresponds to the inlet. When the telescopic rod moves downward, the transparent contact plate pushes open the sector-shaped elastic retaining rod downward and enters the humidity adjustment chamber to press down the concrete specimen.

[0029] Furthermore, it further includes:

[0030] A plurality of atomizing nozzles, which are arranged in the humidity adjustment chamber and are communicated with an external water tank;

[0031] An internal circulation drying mechanism, which is arranged in the humidity adjustment chamber and can absorb water vapor;

[0032] A third camera, which is arranged in the humidity adjustment chamber, and its image acquisition end corresponds to the side surface of the specimen, and is used to acquire an image of the side surface of the specimen;

[0033] A humidity sensor, which is arranged in the humidity adjustment chamber and is electrically connected to the controller. The controller is used to adjust the spraying amount of the atomizing nozzles and the start and stop of the internal circulation drying mechanism.

[0034] Furthermore, the internal circulation drying mechanism includes:

[0035] A drying box, which is arranged on the inner side surface of the humidity adjustment chamber. A drying chamber and a wind chamber that are communicated with each other are defined in the drying box. An absorbent filler is arranged in the drying chamber. The drying box is provided with an air inlet communicated with the drying chamber and an air outlet communicated with the wind chamber;

[0036] A circulation fan, which is arranged in the wind chamber and corresponds to the position of the air outlet.

[0037] Furthermore, it further includes:

[0038] The inner ring body is provided with a plurality of first test stations along the circumferential direction. The base extends downward to form a connecting member. The first test station is provided with a first connecting groove corresponding to the connecting member and a first cavity corresponding to the first image acquisition chamber. The base can be clamped through the connecting member and the first connecting groove. At this time, the first image acquisition chamber is located in the first cavity.

[0039] The outer ring body is provided with a plurality of second test stations along the circumferential direction. The second test station is provided with a second connecting groove corresponding to the connecting member and a second cavity corresponding to the first image acquisition chamber. The base can be clamped through the connecting member and the second connecting groove. At this time, the first image acquisition chamber is located in the second cavity.

[0040] The inner ring body and the outer ring body rotate through a rotating mechanism and can drive the base to move to a position corresponding to the transparent contact plate and the inlet. The inner ring body and the outer ring body are connected by a bearing.

[0041] Furthermore, the rotating mechanism includes:

[0042] The first external tooth-shaped slewing bearing has a first external tooth-shaped rotating part and a first supporting part. The first external tooth-shaped rotating part is arranged on the lower surface of the inner ring body and is connected to the first driving motor. The first driving motor is used to drive the first external tooth-shaped rotating part and the inner ring body to rotate horizontally.

[0043] The hydraulic press has a first telescopic rod and a second telescopic rod. The first telescopic rod and the second telescopic rod are arranged at intervals and the ends of the first telescopic rod and the second telescopic rod are both provided with pressing plates. The first driving motor can drive the inner ring body to rotate to a position where the first test station corresponds to the first telescopic rod.

[0044] Furthermore, the rotating mechanism further includes:

[0045] The second external tooth-shaped slewing bearing has a second external tooth-shaped rotating part and a second supporting part. The second external tooth-shaped rotating part is arranged on the lower surface of the outer ring body and is connected to the second driving motor. The second driving motor is used to drive the second external tooth-shaped rotating part and the outer ring body to rotate horizontally.

[0046] The second driving motor can drive the outer ring body to rotate to a position where the second test station corresponds to the second telescopic rod.

[0047] The present invention discloses the following technical effects:

[0048] 1. The present invention uses a transparent alumina stage to support the specimen. The transparent alumina stage has excellent thermal conductivity and strength and is transparent in material. On the one hand, a heating mechanism can be arranged inside the transparent alumina stage to transfer heat to the specimen in a contact heat exchange manner, thereby ensuring that the specimen temperature reaches the preset temperature and improving the temperature control accuracy. On the other hand, a camera can be arranged below the transparent alumina stage to collect images of the lower surface of the specimen. During the anti-cracking performance test of the concrete specimen, the cracking situation of the specimen can be accurately grasped, and the test accuracy can be improved.

[0049] 2. The present invention sets a humidity adjustment chamber on the base and an inlet is arranged at the top of the chamber. Sector-shaped elastic blocking rods are arranged in the inlet. Before the test, the external air can be isolated by multiple sector-shaped elastic blocking rods to maintain the internal humidity. During the test, the sector-shaped elastic blocking rods can be pushed open by the hydraulic press to apply pressure to the specimen. Compared with the prior art, the humidity adjustment mechanism and the hydraulic press are coupled on the premise of ensuring the sealing performance, greatly reducing the area of the humidity adjustment chamber, reducing the difficulty of humidity adjustment, thereby improving the humidity control accuracy and the test accuracy.

[0050] 3. The heating mechanism includes a heating tube embedded inside the transparent alumina stage and a transparent conductive film arranged on the lower surface of the transparent alumina stage. This setting can, on the one hand, utilize the rapid heating function of the heating tube to increase the temperature of the transparent alumina stage and the concrete specimen in a short time, and the heating tube is located outside the specimen (support area), which does not affect the image collection of the lower surface of the specimen. On the other hand, utilize the transparent property and the conductive heat generation property of the transparent conductive film to perform auxiliary heating below the transparent alumina stage, avoiding poor heating effect in the central area of the transparent alumina stage and affecting the heating uniformity of the concrete specimen, and the transparent conductive film is transparent in material and does not affect the image collection of the lower surface of the specimen.

[0051] 4. The present invention adopts a turntable support structure composed of an inner ring body and an outer ring body, and test stations are arranged on the inner ring body and the outer ring body. Since each humidity adjustment chamber is independent, each heating mechanism is independent, and each specimen is located in the humidity adjustment chamber without affecting each other, different test parameters can be set at each test station according to specific test requirements. Setting the inner ring body and the outer ring body can place multiple groups of specimens with similar test temperature differences on the same ring body. Taking the concrete specimens on the inner ring body with lower temperature as an example, multiple groups of specimens on the inner ring body can quickly reach the target temperature in a short time, thereby achieving the purpose of continuous testing of multiple groups of specimens, while the multiple groups of specimens on the outer ring body require longer heating time and need to continue heating, but it will not destroy the test continuity of the specimens on the inner ring body, thus improving the test efficiency.

[0052] 5. The output end of the hydraulic press is provided with a second image acquisition chamber, a second camera, and a transparent contact plate. During the process of pressurizing the specimen, images of the upper surface of the specimen can be synchronously acquired. Combining with the first camera and the third camera, all-round image acquisition of the specimen can be completed, and the cracking condition of the specimen can be monitored in a timely and comprehensive manner. Description of the Drawings

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0054] Figure 1 Schematic diagram of the cooperation between the humidity adjustment chamber and the base of the present invention;

[0055] Figure 2 Schematic diagram of the structure of the present invention;

[0056] Figure 3 Schematic diagram of the second image acquisition chamber;

[0057] Figure 4 Schematic diagram of the single-sided cross-section of the inner ring body and the outer ring body;

[0058] Figure 5 Schematic diagram of the external structure of the humidity adjustment mechanism;

[0059] Figure 6 Top view of the inner ring body and the outer ring body;

[0060] Figure 7 Schematic diagram of the structure of the hydraulic press;

[0061] Figure 8 Schematic diagram of the structure of the internal circulation drying mechanism;

[0062] Among them, 1. Base; 101. Installation groove; 1011. Support platform; 102. First image acquisition chamber; 103. Connector; 2. Transparent alumina stage; 201. Support area; 202. Acquisition area; 3. Concrete specimen; 4. First camera; 5. Hydraulic press; 501. First telescopic rod; 502. Second telescopic rod; 6. Pressure sensor; 7. Heating tube; 8. Transparent conductive film; 9. Temperature sensor; 10. Humidity adjustment chamber; 11. Sector elastic stop bar; 12. Second image acquisition chamber; 13. Second camera; 14. Transparent contact plate; 15. Atomizing nozzle; 16. External water tank; 17. Third camera; 18. Drying oven; 19. Water-absorbing filler; 20. Circulating fan; 21. Inner ring body; 2101. First connection groove; 2102. First cavity; 22. Outer ring body; 2201. Second connection groove; 2202. Second cavity; 23. First externally toothed slewing bearing; 24. First driving motor; 25. Second externally toothed slewing bearing; 26. Second driving motor; 27. Pressure plate. Detailed implementation

[0063] In the existing technologies retrieved:

[0064] CN109187196B discloses a test device for the early anti-cracking performance of concrete to solve the defects that the detection of the anti-cracking performance of the concrete by the existing test device is relatively single, resulting in low accuracy of the detection results of the concrete anti-cracking performance, which easily causes cracks in the concrete, affecting the integrity, durability, and even safety and stability of the building, and the dust collection and treatment effect of the device during the test process is poor, resulting in easy dispersion of dust, entering the gaps of the equipment, increasing the wear of the equipment, and reducing the service life.

[0065] Technical solution: A test device for the early anti-cracking performance of concrete, the structure of which includes an adjustment controller top plate, a hydraulic telescopic cylinder, an anti-cracking stress rod, a support column, a fixed support base, a compression and dust removal multi-faceted test device, and an operation table. The hydraulic telescopic cylinder is provided below the adjustment controller top plate and is connected by a nested manner. The anti-cracking stress rod is embedded at the bottom of the hydraulic telescopic cylinder and is connected by a sliding manner. The top of the support column is nested with the adjustment controller top plate. The bottom of the support column is embedded on the upper surface of the operation table. The bottom of the fixed support base is connected to the upper surface of the operation table by an adhesive manner. The compression and dust removal multi-faceted test device is embedded inside the operation table. The top of the fixed support base is connected to the adjustment controller top plate by a nested manner.

[0066] Multi - aspect test device for compression and dust removal: The multi - aspect test device for compression and dust removal includes a protective housing, a concrete slab to be tested, a rotary variable - speed motor, a wind - powered dust - suction drive mechanism, a repeated collection and pushing mechanism, a mechanical connection drive mechanism, a hydraulic compression and block - forming mechanism, a transition rotary connection mechanism, a gas compression and collection mechanism, and a temperature - control simulation test drive mechanism. The rotary variable - speed motor is embedded inside the protective housing and connected by adhesion. The concrete slab to be tested is connected to the upper surface of the protective housing by fitting. The wind - powered dust - suction drive mechanism is provided on the right side of the rotary variable - speed motor and connected by rotation. The wind - powered dust - suction drive mechanism is mechanically connected to the repeated collection and pushing mechanism. The mechanical connection drive mechanism is installed on the left side of the wind - powered dust - suction drive mechanism and rotationally connected by meshing. The hydraulic compression and block - forming mechanism is provided below the mechanical connection drive mechanism and connected by sliding. The transition rotary connection mechanism is mechanically connected to the wind - powered dust - suction drive mechanism. The transition rotary connection mechanism is installed on the left side of the gas compression and collection mechanism and connected by machinery. The gas compression and collection mechanism is embedded below the temperature - control simulation test drive mechanism and connected by adhesion.

[0067] Working principle: Start the rotary variable - speed motor, and make it rotate at a high speed to drive the motor screw rod to rotate, so that the mating gear meshing with it moves. Drive the turbine disc to rotate through the connecting belt, so that the double - headed screw rod connected to it rotates, drive the horizontal screw rod meshing with it to rotate, so that the blades rotate, generating wind and sucking dust. At the same time, the mating gear drives the active internal gear to rotate through the connecting belt, so that the transmission chain drives the installation movable block to move, so that the collection push rod moves left and right, collecting the inhaled dust to the left end. At the same time, the horizontal screw rod drives the linked vertical worm meshing with it to rotate, so that the transmission worm rod coaxial with it rotates together, driving the meshing turbine to act, driving the piston slider to move back and forth left and right inside the transition piston cylinder through the connecting push rod, so that the hydraulic oil in the oil storage tank enters the transition piston cylinder through the liquid guide pipe, and then enters the extension rod sleeve to push the compression piston rod to move downward, compressing the collected dust to prevent it from spreading. When the temperature detection of the concrete slab to be tested is required, reduce the rotation speed of the rotary variable - speed motor, so that the centrifugal force is reduced. The centrifugal wheel is connected to the mating gear and rotates accordingly. Then, push the repeated slider to slide back and forth along the outer surface of the limit chute rod through the movable connecting rod, so that the guiding frame connected to the repeated slider through the moving push rod moves along the direction of the track, so that the positioning pin acts inside the guiding frame, driving the linked rotating disc to rotate. Then, drive the semi - gear to rotate through the conveying connecting belt, so that the linked tooth block frame meshing with it drives the connecting shaft to move up and down, achieving the purpose of gas collection through the repeated compression air - collecting cylinder. Then, enter the air temperature controller through the air guide pipe for temperature control. Finally, conduct a test on the concrete slab to be tested through the aerator.

[0068] Patent CN113340725B discloses a test device for the crack resistance performance of concrete to solve the problems in the prior art that the labor intensity of manually replacing concrete test pieces frequently is large, and it is difficult for the existing crack resistance test devices to fully simulate the crack resistance performance of concrete test pieces in an environment with set temperature and humidity.

[0069] Technical solution: A test device for the crack resistance performance of concrete, including a test chamber with a test space inside. In the internal space of the test chamber, there is a positioning tray for placing concrete test pieces, and at the bottom end of the positioning tray, there is a tray base mechanism for carrying the positioning tray. Inside the test chamber, there is a detection environment generation device installed to provide a specific test environment to the inside of the positioning tray by cooperating with the tray base mechanism. Inside the test chamber, there is a stamping device installed to apply stress tests to the concrete test pieces in cooperation with the positioning tray. Outside the telescopic structure of the stamping device, there is a tray detection top cover installed to cooperate with the stamping device to extend out to close the top opening of the positioning tray and detect the variable of the test environment inside the positioning tray. On the test chamber, there is a control module installed to receive the detection signals of the tray detection top cover in real time and control each device of the detection environment generation device.

[0070] Working principle: By using the positioning tray to hold the concrete test pieces, and using the tray base mechanism installed in the test chamber to quickly position and carry the positioning tray, and during the process of taking out the positioning tray, it can be quickly slid out of the test chamber through the cooperation of both sides of the positioning tray and the tray base mechanism, thus simplifying the process of replacing the concrete test pieces and reducing the labor intensity; and after the positioning tray is placed in the tray base mechanism, the concrete test piece is directly below the stamping device inside the test chamber, which is convenient for conducting stress crack resistance tests on the concrete test pieces, and the stress intensity borne by the concrete test pieces can be displayed in real time through the tray base mechanism at the bottom end, which is convenient for observing the stress crack resistance performance of the concrete test pieces; in addition, by setting a tray detection top cover on the telescopic structure of the stamping device to cooperate with covering the top opening of the positioning tray, and during the process of installing the positioning tray on the tray base mechanism, the detection environment generation device quantitatively applies hot air or humidity to the inside of the positioning tray through the tray base mechanism, so as to simulate the crack resistance performance of the concrete test pieces in different environments; and the suction device can be controlled to generate suction communicating with the outside in the positioning tray. When a large amount of suspended dust is generated due to the fragmentation of the concrete test piece, the suction device can be started to quickly evacuate the dust generated inside the positioning tray.

[0071] CN115508232B discloses a device for detecting the crack resistance performance of manufactured sand concrete, which includes an impact platform, a first track, a limiting track, a screw propelling rod, a limiting plate, an impact sliding seat and a clamping rod. Reciprocating sliders are slidably connected to the inner walls of the two first tracks, and first mounting holes are formed in the outer walls of one sides of the two reciprocating sliders. First rotating shafts are connected to the inner walls of the two first mounting holes through bearings. The outer walls of the two first rotating shafts are fixedly connected to the same rotating platform. A rotating handle is fixedly connected to the outer wall of one side of the screw propelling rod. A spiral hole is formed in the outer wall of one side of one of the reciprocating sliders, and the screw propelling rod is located inside the spiral hole. A reciprocating sliding seat is slidably connected to the inner wall of the limiting track, and a rack is fixedly connected to the outer wall of one side of the reciprocating sliding seat. A second mounting hole is formed in the outer wall of one side of the limiting plate. A second rotating shaft is connected to the inner wall of the second mounting hole through a bearing, and a toothed plate is fixedly connected to the outer wall of the second rotating shaft. A first connecting plate is fixedly connected to the outer wall of one side of the limiting plate, and a first motor is fixedly connected to the outer wall of one side of the first connecting plate. An impact rod is fixedly connected to the outer wall of one side of the impact sliding seat, and a pressure sensor is fixedly connected to the outer wall of one side of the impact rod. A clamping block is fixedly connected to the outer wall of one side of the clamping rod. A resisting block is fixedly connected to the outer wall of one side of the impact sliding seat. A limiting seat is fixedly connected to the outer wall of one side of the reciprocating sliding seat, and a telescopic spring is fixedly connected between the outer wall of one side of the limiting seat and the outer wall of one side of the impact sliding seat.

[0072] Working principle: By setting up a rotating ejection impact component, when conducting a toughness impact test on a concrete block, start the first motor. The first motor drives the toothed plate to rotate, causing the toothed plate to drive the reciprocating sliding seat to move within the limiting track. The reciprocating sliding seat drives the impact sliding seat to move forward. During the movement of the impact sliding seat, the resisting block on the impact sliding seat abuts against the clamping block above the clamping rod, causing the impact sliding seat to be subjected to resistance. At this time, the telescopic spring is compressed. When the first motor drives the toothed plate to continue rotating, when the resisting block and the clamping block suddenly separate, the telescopic spring instantaneously ejects, driving the pressure sensor on the impact rod on the impact sliding seat to impact the concrete block. The concrete block can be effectively tested through the ejection impact method. At the same time, the rotating handle can be rotated to make the screw propelling rod drive one of the reciprocating sliders to move within the first track, and the rotating platform drives the other reciprocating slider to move within the first track, enabling the rotating platform to adjust the impact angle of the ejection impact component and conduct impact tests on multiple locations on the surface of the concrete block, improving the test results.

[0073] None of the above patents can solve the technical problems described in the background art of this application.

[0074] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0075] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0076] An embodiment of the present invention provides a device for detecting the crack resistance of concrete for building civil engineering, including:

[0077] A base 1, the upper surface of which is recessed downward to form a mounting groove 101, and the middle part of the mounting groove 101 is recessed downward to form a first image acquisition chamber 102. The first image acquisition chamber 102 and the mounting groove 101 are arranged in a T shape as a whole;

[0078] A transparent alumina carrier 2, which is arranged in the mounting groove 101, and a concrete specimen 3 is arranged on the transparent alumina carrier 2;

[0079] A first camera 4, which is arranged in the first image acquisition chamber 102, and its image acquisition end faces the transparent alumina carrier 2 and can acquire an image of the lower surface of the concrete specimen 3;

[0080] A heating mechanism, which is arranged inside and / or on the lower surface of the transparent alumina carrier 2, and the heating mechanism is used to heat the specimen to a target temperature;

[0081] A hydraulic press 5, the end of the telescopic rod of which is provided with a pressing plate 27, and the hydraulic press 5 presses on the upper surface of the specimen through the pressing plate 27.

[0082] In this embodiment, it further includes:

[0083] A pressure sensor 6, the mounting groove 101 defines support platforms 1011 on the left and right sides of the first image acquisition chamber 102, the pressure sensor 6 is arranged on the support platforms 1011, and the lower surface of the transparent alumina carrier 2 is in contact with the pressure sensor 6.

[0084] In this embodiment, the heating mechanism includes:

[0085] A heating pipe 7, the area of the transparent alumina carrier 2 corresponding to the support platform 1011 is a support area 201, and the area corresponding to the first image acquisition chamber 102 is an acquisition area 202. The heating pipe 7 is embedded in the support area 201.

[0086] In this embodiment, the heating mechanism further includes:

[0087] A transparent conductive film 8 is disposed on the lower surface of the collection area 202 and electrically connected to an external power source.

[0088] A temperature sensor 9 is disposed on the base 1 and connected to the specimen through an induction wire. The temperature sensor 9 is used to monitor the temperature of the specimen.

[0089] A controller is electrically connected to the heating tube 7 and the transparent conductive film 8. The controller is used to adjust the heating temperature of the transparent conductive film 8 and the heating tube 7.

[0090] In this embodiment, it further includes:

[0091] A humidity adjustment chamber 10 is disposed on the base 1. The specimen is located inside the humidity adjustment chamber 10, and the humidity adjustment chamber 10 can adjust the internal humidity. An inlet is provided at the top of the humidity adjustment chamber 10, and the inlet corresponds to the specimen.

[0092] A plurality of sector-shaped elastic blocking rods 11 are made of a flexible and elastic material, such as rubber. One end is fixedly connected to the inner edge of the inlet, and the other end extends towards the center of the inlet. The inlet is a round hole. The plurality of sector-shaped elastic blocking rods 11 are arranged in sequence along the circumference to form an elastic baffle matching the shape of the inlet. The sector-shaped elastic blocking rods 11 have an upward elastic tendency and can close the inlet. To improve the sealing performance of the sector-shaped elastic blocking rods 11, in this embodiment, multiple layers of sector-shaped elastic blocking rods 11 are arranged in the up and down direction.

[0093] A second image acquisition chamber 12 is disposed below the pressing plate 27 and made of a transparent and high-pressure resistant material. The specific material is not limited as long as it meets the test requirements. A transparent contact plate 14 is provided at the bottom of the second image acquisition chamber 12. The second image acquisition chamber 12 is made of a transparent material, which can increase the image acquisition range of the second camera 13.

[0094] A second camera 13 is disposed inside the second image acquisition chamber 12, and its image acquisition end corresponds to the transparent contact plate 14. The second camera 13 is used to acquire images of the upper surface of the concrete specimen 3.

[0095] The transparent contact plate 14 corresponds to the inlet. When the telescopic rod moves downward, the transparent contact plate 14 pushes open the sector-shaped elastic blocking rods 11 downward and enters the humidity adjustment chamber 10 to press down the concrete specimen 3.

[0096] In this embodiment, it further includes:

[0097] A plurality of atomizing nozzles 15 are disposed inside the humidity adjustment chamber 10 and communicated with an external water tank 16. An internal circulation drying mechanism is disposed inside the humidity adjustment chamber 10 and can absorb water vapor.

[0098] The third camera 17 is disposed within the humidity adjustment chamber 10, and its image acquisition end corresponds to the side surface of the specimen, for acquiring the side image of the specimen;

[0099] The humidity sensor is disposed within the humidity adjustment chamber 10 and electrically connected to the controller, and the controller is used to adjust the spraying amount of the atomizing nozzle 15 and the start and stop of the internal circulation drying mechanism.

[0100] In this embodiment, the internal circulation drying mechanism includes:

[0101] The drying box 18 is disposed on the inner side surface of the humidity adjustment chamber 10. A drying chamber and a wind chamber that communicate with each other are defined within the drying box 18. An absorbent filler 19 is disposed within the drying chamber. The drying box 18 is provided with an air inlet communicating with the drying chamber and an air outlet communicating with the wind chamber;

[0102] The circulation fan 20 is disposed within the wind chamber and corresponds to the position of the air outlet.

[0103] In this embodiment, it further includes:

[0104] The inner ring body 21 is provided with a plurality of first test stations along the circumferential direction. The base 1 extends downward to form a connecting member 103, and the connecting member 103 is annular; the first test station is provided with a first connection groove 2101 corresponding to the connecting member 103 and a first cavity 2102 corresponding to the first image acquisition chamber 102. The base 1 can be snap-connected through the connecting member 103 and the first connection groove 2101. At this time, the first image acquisition chamber 102 is located within the first cavity 2102;

[0105] The outer ring body 22 is provided with a plurality of second test stations along the circumferential direction. The second test station is provided with a second connection groove 2201 corresponding to the connecting member 103 and a second cavity 2202 corresponding to the first image acquisition chamber 102. The shapes of the first connection groove 2101, the second connection groove 2201 and the connecting member 103 are adapted to each other. The first cavity 2102 and the second cavity 2202 are slightly larger than the first image acquisition chamber 102. The base 1 can be snap-connected through the connecting member 103 and the second connection groove 2201. At this time, the first image acquisition chamber 102 is located within the second cavity 2202;

[0106] The inner ring body 21 and the outer ring body 22 rotate through a rotating mechanism and can drive the base 1 to move to the position corresponding to the transparent contact plate 14 and the inlet. The inner ring body 21 and the outer ring body 22 are connected through a bearing.

[0107] In this embodiment, the rotating mechanism includes:

[0108] The first externally toothed slewing bearing 23 has a first externally toothed rotating part and a first supporting part. The first externally toothed rotating part is arranged on the lower surface of the inner ring body 21 and is connected to the first driving motor 24. The first driving motor 24 is used to drive the first externally toothed rotating part and the inner ring body 21 to rotate horizontally.

[0109] The hydraulic press 5 has a first telescopic rod 501 and a second telescopic rod 502. The first telescopic rod 501 and the second telescopic rod 502 are arranged at intervals, and pressing plates 27 are provided at the ends of the first telescopic rod 501 and the second telescopic rod 502. The first driving motor 24 can drive the inner ring body 21 to rotate to a position corresponding to the first telescopic rod 501 at the first test station.

[0110] In this embodiment, the rotating mechanism further includes:

[0111] The second externally toothed slewing bearing 25 has a second externally toothed rotating part and a second supporting part. The second externally toothed rotating part is arranged on the lower surface of the outer ring body 22 and is connected to the second driving motor 26. The second driving motor 26 is used to drive the second externally toothed rotating part and the outer ring body 22 to rotate horizontally.

[0112] The second driving motor 26 can drive the outer ring body 22 to rotate to a position corresponding to the second telescopic rod 502 at the second test station.

[0113] In this embodiment, the hydraulic press 5 is located on one side of the outer ring body 22. The top of the hydraulic press 5 extends upward towards the inner ring body 21 and the outer ring body 22 to form an extension part. The first telescopic rod 501, the second telescopic rod 502 and the corresponding power mechanism are located on the lower surface of the above extension part.

[0114] The specific working process is as follows:

[0115] According to the test temperature requirements of multiple groups of concrete specimens 3, multiple groups of concrete specimens 3 are divided into an inner ring group and an outer ring group. The specimens in the inner ring group are arranged at the first test station, and the specimens in the outer ring group are arranged at the second test station. The heating tubes 7 and the transparent conductive films 8 are started to start heating the specimens in the inner ring group, and the specimens in the outer ring group are also heated synchronously.

[0116] According to the test humidity requirements, the controller adjusts the spraying amount of the atomizing nozzle 15 to make the humidity in the humidity adjustment chamber 10 reach the preset value.

[0117] The specimens in the inner ring group quickly reach the preset temperature. The first driving motor 24 is started to drive the inner ring body 21 to rotate until the first test station rotates to the position where the first telescopic rod 501 is located. The hydraulic press 5 presses the pressing plate 27, the second image acquisition chamber 12 and the transparent contact plate 14 through the first telescopic rod 501. The transparent contact plate 14 pushes open the sector-shaped elastic stop rod 11 downward and enters the humidity adjustment chamber 10 to press the concrete specimen 3.

[0118] The first camera 4, the second camera 13, and the third camera 17 collect images of the upper surface, the lower surface, and the outer side surface of the concrete specimen 3 to monitor the cracking condition of the concrete specimen 3. When the concrete specimen 3 cracks, the pressure detected by the pressure sensor 6 and the corresponding temperature and humidity environment parameters of the specimen are recorded.

[0119] The hydraulic press 5 drives the transparent contact plate 14 to reset, and the first drive motor 24 is started again to drive the inner ring body 21 to rotate until the next first specimen station rotates to the position where the first telescopic rod 501 is located, and the above operations are repeated.

[0120] For the outer ring group specimens, their heating rate is slower than that of the inner ring group specimens. When the outer ring group specimens reach the target temperature, the operation steps are the same as above, and the only difference is that the second drive motor 26 drives the outer ring body 22 to rotate, thereby driving the second specimen station to rotate to the position where the second telescopic rod 502 is located.

[0121] When the detection of the concrete specimen 3 is completed, the heating tube 7 and the transparent conductive film 8 are turned off, and the heating roller and the transparent conductive film 8 automatically cool down. For the humidity adjustment chamber 10, since its environment is sealed, the circulating fan 20 needs to be turned on, and the water-absorbing filler 19 in the drying box 18 is used to absorb moisture, thereby reducing it to the initial state or reducing it to the humidity level required for the next group of concrete specimens 3.

[0122] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0123] The above-described embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A device for detecting the crack resistance of concrete used in building civil engineering, characterized in that, Comprising: A base (1), the upper surface of which is recessed downward to form a mounting groove (101), and the middle part of the mounting groove (101) is recessed downward to form a first image acquisition chamber (102); A transparent alumina stage (2), arranged in the mounting groove (101), and a concrete specimen (3) is arranged on the transparent alumina stage (2); A first camera (4), arranged in the first image acquisition chamber (102), and its image acquisition end faces the transparent alumina stage (2) and can acquire an image of the lower surface of the concrete specimen (3); A heating mechanism, arranged inside the transparent alumina stage (2) and / or on the lower surface of the transparent alumina stage (2), and the heating mechanism is used to heat the specimen to a target temperature; A hydraulic press (5), the end of the telescopic rod of which is provided with a pressing plate (27), and the hydraulic press (5) presses on the upper surface of the specimen through the pressing plate (27).

2. The concrete crack resistance detection device for building civil engineering according to claim 1, characterized in that, Further comprising: A pressure sensor (6), the mounting groove (101) defines support platforms (1011) on the left and right sides of the first image acquisition chamber (102), the pressure sensor (6) is arranged on the support platforms (1011), and the lower surface of the transparent alumina stage (2) is in contact with the pressure sensor (6).

3. A concrete crack resistance detection device for building civil engineering according to claim 2, characterized in that, The heating mechanism includes: A heating pipe (7), the area of the transparent alumina stage (2) corresponding to the support platform (1011) is a support area (201), and the area corresponding to the first image acquisition chamber (102) is an acquisition area (202), and the heating pipe (7) is embedded in the support area (201).

4. An anti-cracking detection device for building civil engineering concrete according to claim 3, characterized in that, The heating mechanism further includes: A transparent conductive film (8), arranged on the lower surface of the acquisition area (202) and electrically connected to an external power supply; A temperature sensor (9), arranged on the base (1) and connected to the specimen through an induction wire, and the temperature sensor (9) is used to monitor the temperature of the specimen; A controller, electrically connected to the heating pipe (7) and the transparent conductive film (8), and the controller is used to adjust the heating temperature of the transparent conductive film (8) and the heating pipe (7).

5. The concrete crack resistance detection device for building civil engineering according to claim 4, characterized in that, Further comprising: A humidity adjustment chamber (10), arranged on the base (1), the specimen is located in the humidity adjustment chamber (10), and the humidity adjustment chamber (10) can adjust the internal humidity; an inlet is opened at the top of the humidity adjustment chamber (10), and the inlet corresponds to the specimen; A plurality of sector-shaped elastic stop rods (11), one end of which is fixedly connected to the inner edge of the inlet, and the other end extends towards the center of the inlet. The inlet is a circular hole, and the plurality of sector-shaped elastic stop rods (11) are arranged in sequence along the circumference to form an elastic baffle adapted to the shape of the inlet. The sector-shaped elastic stop rods (11) have an upward elastic tendency and can close the inlet; A second image acquisition chamber (12), arranged below the pressing plate (27), and a transparent contact plate (14) is arranged at the bottom of the second image acquisition chamber (12); A second camera (13) is disposed within the second image acquisition chamber (12), and its image acquisition end corresponds to the transparent contact plate (14). The second camera (13) is configured to acquire an image of the upper surface of the concrete specimen (3). The transparent contact plate (14) corresponds to the entrance. When the telescopic rod moves downward, the transparent contact plate (14) pushes down the fan-shaped elastic stop rod (11) and enters the humidity adjustment chamber (10) to press down the concrete specimen (3).

6. The concrete crack resistance detection device for building civil engineering according to claim 5, characterized in that, Further included are: A plurality of atomizing nozzles (15) are disposed within the humidity adjustment chamber (10) and are in communication with an external water tank (16); an internal circulation drying mechanism is disposed within the humidity adjustment chamber (10) and is capable of absorbing water vapor. A third camera (17) is disposed within the humidity adjustment chamber (10), and its image acquisition end corresponds to the side surface of the specimen and is configured to acquire an image of the side surface of the specimen. A humidity sensor is disposed within the humidity adjustment chamber (10) and is electrically connected to the controller. The controller is configured to adjust the spraying amount of the atomizing nozzles (15) and the start / stop of the internal circulation drying mechanism.

7. An anti-cracking detection device for building civil engineering concrete according to claim 6, characterized in that, The internal circulation drying mechanism includes: A drying box (18) is disposed on the inner side surface of the humidity adjustment chamber (10). A drying chamber and a wind chamber that are in communication with each other are defined within the drying box (18). An absorbent filler (19) is disposed within the drying chamber. The drying box (18) is provided with an air inlet that is in communication with the drying chamber and an air outlet that is in communication with the wind chamber. A circulation fan (20) is disposed within the wind chamber and corresponds to the position of the air outlet.

8. A concrete crack resistance detection device for building civil engineering according to any one of claims 5-7, characterized in that, Further included are: An inner ring body (21) is provided with a plurality of first test stations along the circumferential direction. The base (1) extends downward to form a connecting member (103). The first test station is provided with a first connection groove (2101) corresponding to the connecting member (103) and a first cavity (2102) corresponding to the first image acquisition chamber (102). The base (1) can be snap-connected through the connecting member (103) and the first connection groove (2101). At this time, the first image acquisition chamber (102) is located within the first cavity (2102). An outer ring body (22) is provided with a plurality of second test stations along the circumferential direction. The second test station is provided with a second connection groove (2201) corresponding to the connecting member (103) and a second cavity (2202) corresponding to the first image acquisition chamber (102). The base (1) can be snap-connected through the connecting member (103) and the second connection groove (2201). At this time, the first image acquisition chamber (102) is located within the second cavity (2202). The inner ring body (21) and the outer ring body (22) rotate through a rotating mechanism and can drive the base (1) to move to a position where the transparent contact plate (14) corresponds to the entrance. The inner ring body (21) and the outer ring body (22) are connected through a bearing.

9. An anti-cracking detection device for building civil engineering concrete according to claim 8, characterized in that, The rotating mechanism includes: The first externally toothed slewing bearing (23) has a first externally toothed rotating part and a first supporting part. The first externally toothed rotating part is arranged on the lower surface of the inner ring body (21) and is connected to the first driving motor (24). The first driving motor (24) is used to drive the first externally toothed rotating part and the inner ring body (21) to rotate horizontally. The hydraulic press (5) has a first telescopic rod (501) and a second telescopic rod (502). The first telescopic rod (501) and the second telescopic rod (502) are arranged at intervals, and pressing plates (27) are provided at the ends of the first telescopic rod (501) and the second telescopic rod (502). The first driving motor (24) can drive the inner ring body (21) to rotate to a position corresponding to the first telescopic rod (501) at the first test station.

10. A concrete crack resistance detection device for building civil engineering according to claim 9, characterized in that, The rotating mechanism further includes: The second externally toothed slewing bearing (25) has a second externally toothed rotating part and a second supporting part. The second externally toothed rotating part is arranged on the lower surface of the outer ring body (22) and is connected to the second driving motor (26). The second driving motor (26) is used to drive the second externally toothed rotating part and the outer ring body (22) to rotate horizontally. The second driving motor (26) can drive the outer ring body (22) to rotate to a position corresponding to the second telescopic rod (502) at the second test station.

Images