Concrete quality detection device and method

Abstract

The present invention belongs to the technical field of concrete detection, and discloses a concrete quality detection device and method, the device includes a detection chamber with an opening at the top and a load mechanism arranged on the detection chamber, and also includes an airbag, which is an annular airbag, and the shape of the inner side of the airbag after inflation is the same as the shape of the test piece; an air pump, the air pump is connected to the airbag through a pipeline, and also includes a protective component, the protective component includes a protective plate and a protective airbag, the protective plate is symmetrically arranged at the top of the detection chamber, the protective airbag is arranged in the protective plate, and the protective airbag extends out of the protective plate after inflation, and the protective airbag is connected to the airbag through a pipeline; this solution inflates the airbag by using the air pump, utilizes the plasticity of the airbag to expand the airbag, and pushes the tilted test piece inside the airbag to place it in the center of the pressure applied by the load mechanism. The present invention solves the problem that the edges of concrete blocks are easily damaged during the straightening process.

Description

Technical Field

[0001] The present invention belongs to the technical field of concrete detection, and specifically relates to a concrete quality detection device and method. Background Art

[0002] Concrete is a crucial building material in construction. Due to its high strength, durability, and plasticity, it is widely used in the construction of structural components, foundations, walls, floors, and bridges. However, the quality of concrete directly affects the lifespan of the entire structure, making concrete testing essential. Testing can assess concrete's compressive strength, durability, and other properties. Compression testing, in particular, directly reflects the concrete's ability to withstand loads in actual use and is a key step in ensuring structural safety.

[0003] Referring to the existing document with the publication (announcement) number CN111693376A, a concrete compressive strength testing device is disclosed. After placing a cubic concrete specimen on a base plate, the concrete specimen is pushed using infrared rays and a push plate to move the center of the concrete specimen to the center of the pressure block so that the centers of the two are located on the same center line. When the hydraulic cylinder controls the pressure block to descend, pressure can be evenly applied to the concrete specimen, ensuring uniform force and preventing the displacement of the concrete specimen from affecting the test effect.

[0004] During the use of the above-mentioned device, the concrete test block is generally placed on the test table manually, and manual operation sometimes causes the concrete test block to be placed at an angle and not to be properly aligned. When a push plate is used to drag the tilted concrete test block, the force is uneven and concentrated on the smaller contact surface of the test block, which increases the pressure on the edges of the concrete test block, and the edges are more fragile than the flat part of the test block. Therefore, the pressure applied by the push plate easily causes stress concentration on the edges, causing damage to the edges or cracks. Once the edges of the test piece to be tested are damaged, the structural integrity of the concrete is destroyed, which directly affects the accuracy of the compressive test data. Furthermore, during the compression test of the concrete test piece, the compression process usually requires the test piece to be crushed in order to determine its maximum compressive strength. However, during the test process of the above-mentioned device, the test piece is always in a state of pressure by the push plates on all sides, and the test piece will expand laterally during the crushing process, and the pressure will be released to the surroundings. However, since the concrete specimen is pressed by the push plates on all sides, the specimen cannot break freely in all directions. In order to overcome the resistance of the push plates and crush the specimen, greater pressure needs to be applied. This will cause the specimen to exceed its actual compressive strength, resulting in higher test data and ultimately affecting the accuracy of the results. Summary of the Invention

[0005] The purpose of this solution is to provide a concrete quality detection device to solve the problem that the edges of concrete blocks are easily damaged during the straightening process.

[0006] In order to achieve the above-mentioned object, the present invention provides a concrete quality detection device, comprising a detection chamber with an opening at the top and a load mechanism provided on the detection chamber, and further comprising:

[0007] An airbag, wherein the airbag is an annular airbag, and the shape of the inner side of the airbag after inflation is the same as the shape of the test piece;

[0008] An air pump is connected to the air bag through a pipeline.

[0009] The principle of this solution is to use an air pump to inflate the airbag, leveraging its plasticity to expand it. The inside of the airbag pushes against the tilted specimen, aligning it with the center of the load mechanism. Furthermore, the airbag's flexibility prevents damage to the specimen's edges during alignment.

[0010] The effects of this solution are as follows: (1) Since the airbag is annular and can be inflated to adapt to the shape of the test piece, the edges of the test piece will not be damaged during the straightening process. The flexibility and plasticity of the airbag ensure that the test piece is evenly supported when it contacts the airbag, avoiding the problem of damage to the edges caused by the mechanical device in the prior art, thereby maintaining the integrity of the test piece structure and making the pressure test results more accurate. (2) During the pressure application process, the airbag is deflated, so that the test piece can naturally break apart when crushed, thereby avoiding the problem of inaccurate test results caused by the push plate being fixed on the side wall of the test piece in the prior art. (3) During the pressure application process, the airbag is deflated and retracted. The retracted airbag can cushion the test piece fragments generated during the pressure application process, reducing the impact of the fragments on the surrounding testing equipment. At the same time, the fragments can be concentrated inside the airbag, thereby reducing the dispersion of concrete fragments in the test chamber, making it easier to clean the fragments.

[0011] Furthermore, it also includes a protective component symmetrically arranged on the top of the detection chamber, the protective component includes a protective plate and a protective airbag, the protective plate is symmetrically arranged on the top of the detection chamber, the protective airbag is arranged in the protective plate, and the protective airbag extends out of the protective plate after being inflated. The protective airbag is connected to the airbag through a pipe, and a first solenoid valve is provided on the pipe.

[0012] The principle and effect of this solution are as follows: (1) The first solenoid valve is controlled to deflate the airbag, allowing the gas inside the airbag to fill the protective airbag, causing the protective airbag to extend outside the protective plate, thereby sealing the detection chamber. (2) During the compression process of the concrete specimen, broken pieces will be generated. The protective airbag is used to seal the opening at the top of the detection chamber, thereby sealing the detection chamber and avoiding the risk of concrete fragments flying around.

[0013] Furthermore, a plurality of exhaust valves are provided on the top of the airbag.

[0014] The principle and effect of this solution are as follows: after the pressure application ends, the gas in the protective airbag is refilled into the airbag, causing it to expand again. First, crushed debris can be collected inside the airbag, making it easier to clean up. Second, by opening the exhaust valve and releasing the airbag gas, concrete debris adhering to the pressure plate of the load mechanism can be cleaned.

[0015] Furthermore, an air jet channel is provided around the inner side of the airbag, and the air jet channel is connected to the airbag through an exhaust valve; a supporting plate with holes is provided at the bottom of the detection chamber, and a through groove is opened at the bottom of the detection chamber.

[0016] The principle and effect of this solution is that after the pressure is applied, large concrete blocks are manually removed, but the small debris left in the detection chamber is difficult to clean. By opening the airbag's exhaust valve, the air in the airbag is ejected from the air jet tunnel, thereby ejecting the small debris remaining inside the airbag through the hole and out of the detection chamber.

[0017] Furthermore, it also includes a detection component, which includes a pressure sensor arranged on the load mechanism and a strain gauge arranged on the test piece; it also includes a CCD camera arranged in the detection chamber and a driving unit for driving the CCD camera to move up and down, and the pressure sensor, strain gauge and CCD camera are all electrically connected to the controller.

[0018] The principle and effectiveness of this solution are as follows: a pressure sensor on the loading mechanism monitors and records the pressure applied to the concrete specimen in real time. A strain gauge, installed on the specimen, measures its deformation during compression. A CCD camera observes and records the development of cracks.

[0019] Furthermore, the driving unit includes a cylinder and a support plate connected to the cylinder piston rod, the CCD camera is arranged on the support plate, the cylinder is connected to the airbag through a pipe, a second solenoid valve is provided on the pipe, and the second solenoid valve is electrically connected to the controller.

[0020] The principle and effect of this solution are as follows: (1) When pressure is applied, the second solenoid valve is controlled to allow part of the gas in the airbag to be filled into the cylinder, and the cylinder piston rod drives the support plate to rise, so that the CCD camera is extended to monitor the changes in the cracks during the test piece's pressure. When the value detected by the pressure sensor and the strain gauge exceeds the threshold, the controller controls the second solenoid valve to allow the gas in the cylinder to return to the airbag, so that the airbag is extended and the CCD camera is retracted. (2) When the test piece is compressed and cracks are generated, concrete debris is generally splashed, which can easily hit the CCD camera and cause damage to the equipment. In the existing technology, a protective cover or other equipment is generally added in front of the CCD camera, but even if transparent protective glass is used, the refraction of light will affect the imaging quality. This solution protects the CCD camera by controlling the downward movement of the CCD camera and the upward movement of the airbag, and at the same time avoids the defects caused by the use of other additional protective equipment.

[0021] Furthermore, a slide groove is provided on the detection chamber, and the support plate is slidably connected to the slide groove.

[0022] The principle and effect of this solution are that the slide groove provides positioning and guidance for the movement of the support plate.

[0023] A method for detecting concrete quality, comprising applying the concrete quality detection device as described above, and comprising the following steps:

[0024] Step S10: manually placing the concrete specimen to be tested into the testing chamber of the airbag, starting the air pump to fill the airbag with high-pressure gas to expand it, and adjusting the position of the specimen;

[0025] Step S20: Controlling the load mechanism to apply pressure to the test piece, and then controlling the first solenoid valve and the second solenoid valve to allow the gas in the airbag to be filled into the protective airbag and the cylinder, respectively, causing the protective airbag to extend and seal the test chamber. The piston rod of the cylinder extends, driving the CCD camera upward to monitor crack changes in the test piece.

[0026] Step S30: When the value detected by the strain gauge or pressure sensor exceeds the threshold, the controller controls the second solenoid valve to allow the gas in the cylinder to flow back into the airbag, and the cylinder piston rod drives the CCD camera downward, and the airbag expands and moves upward;

[0027] Step S40: After the specimen is crushed, the controller controls the first solenoid valve to allow the gas in the protective airbag to flow back into the airbag, and large pieces of the specimen are manually removed;

[0028] Step S50: Open the first exhaust valve and the second exhaust valve to clean small debris in the airbag and the pressure plate of the load mechanism.

[0029] The effects of this solution are as follows: (1) The airbag is used to non-destructively straighten and position the concrete specimen, avoiding damage to its edges caused by the straightening method in the existing technology, making the test results more accurate. (2) The protective airbag seals the test chamber, and the airbag cushions the fragments, preventing the concrete fragments from splashing. (3) When the strain gauge and pressure sensor values are detected to exceed the threshold, the gas in the cylinder flows back, causing the CCD camera to retract and the airbag to extend in time, avoiding damage to the equipment. (4) After the pressure process is completed, the gas in the protective airbag flows back into the airbag, making it easier to clean the fragments. The exhaust valve and the exhaust valve allow small pieces of debris in the airbag and the pressure plate of the load mechanism to be quickly cleaned.

[0030] Furthermore, in step S20, when applying pressure to the test piece, it is necessary to apply pressure intermittently so as to maintain a constant pressure within a period of time.

[0031] The effect of this solution is that: in the prior art, it is usually necessary to apply pressure to the concrete continuously so that the piston rod of the loading mechanism is continuously extended. However, rapid and continuous loading may cause the concrete specimen to be unable to adapt to the rapidly increasing stress in time, and thus cannot accurately reflect the true compressive properties of the material. When the loading rate is too fast, the structural adjustment and stress distribution inside the concrete may not keep up with the rate of increase of the load, resulting in the failure of internal damage and crack formation to fully occur, but cracks have already occurred inside, but have not yet appeared on the outside, which will affect the test results. In contrast, this solution adopts an intermittent pressure method, maintaining a constant pressure for a period of time during the pressure process, so that the piston rod stops extending for a period of time, and maintains the pressure for a period of time before the next step of pressure is applied, so that the internal structure of the time is deformed under constant pressure, thereby detecting cracks to produce more accurate pressure values. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The structure of the concrete quality detection device of the present invention is shown in FIG. Figure 1 ;

[0033] Figure 2 The structure of the concrete quality detection device of the present invention is shown in FIG. Figure 2 ;

[0034] Figure 3 The structure of the concrete quality detection device of the present invention is shown in FIG. Figure 3 ;

[0035] Figure 4 Schematic diagram of the structure of the airbag of the present invention;

[0036] Figure 5 The structure of the concrete quality detection device of the present invention is shown in FIG. Figure 4 ;

[0037] Figure 6The structure of the concrete quality detection device of the present invention is shown in FIG. Figure 5 ;

[0038] Figure 7 It is a structural schematic diagram of the protection component of the present invention;

[0039] Figure 8 Schematic diagram of the detection component of the present invention.

[0040] The figure marks in the drawings of the specification include: detection chamber 1, through groove 11, load mechanism 2, airbag 3, test piece 4, protective component 5, protective plate 51, protective airbag 52, first exhaust valve 6, jet channel 7, supporting plate 8, detection component 9, CCD camera 91, drive unit 92, cylinder 921, support plate 922. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the concept and technical effects of the present invention in conjunction with the embodiments to fully understand the purpose, features and effects of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention:

[0042] Example:

[0043] See also Figure 1-Figure 3 A concrete quality testing device comprises a testing chamber 1 with an opening at the top and a loading mechanism 2 mounted on the testing chamber 1. The testing chamber 1 also houses an annular airbag 3 and an air pump. The airbag 3, when inflated, has an inner shape identical to that of a concrete specimen 4 to be tested. The air pump and airbag 3 are connected by a pipe. Loading mechanism 2 utilizes a hydraulic jack with a pressure plate mounted on the piston rod. A pressure sensor and a strain gauge are mounted on the pressure plate.

[0044] The specific operating principle is as follows: An air pump inflates airbag 3, causing it to collide. The inner side of airbag 3 pushes against the tilted specimen 4, aligning it with the center of the load mechanism. The flexibility of airbag 3 also prevents damage to the edges of specimen 4 during the alignment process. Before applying pressure, a strain gauge is placed on top of specimen 4. A hydraulic jack is then activated to apply pressure to specimen 4. A pressure sensor and a strain gauge collect data from the applied load and the strain gauges, respectively. During the pressure application process, airbag 3 is deflated, allowing specimen 4 to naturally break apart. This avoids the inaccurate test results associated with prior art methods where the push plate remains fixed to the side of specimen 4. Furthermore, during the pressure application process, airbag 3 is deflated and retracts. The retracted airbag 3 cushions any specimen fragments generated during the pressure application process, reducing the impact of these fragments on surrounding testing equipment. At the same time, the fragments can be concentrated on the inner side of the air bag 3, thereby reducing the dispersion of concrete fragments in the detection chamber 1, making it easier to clean the fragments.

[0045] See also Figure 4-Figure 7 During the compression process, concrete specimen 4 will break and produce fragments, so it is necessary to prevent concrete fragments from flying around. A protective assembly 5 is also included, which is located at the top of the detection chamber 1. Protective assembly 5 includes a protective plate 51 and a protective airbag 52. Protective plate 51 is symmetrically located at the top of the detection chamber 1. Protective airbag 52 is located within protective plate 51. After inflation, protective airbag 52 extends out of protective plate 51. Protective airbag 52 is connected to airbag 3 via a pipe, and a first solenoid valve is installed on the pipe connecting protective airbag 52 and airbag 3.

[0046] The specific working principle is: control the first solenoid valve to deflate the airbag 3, so that the gas in the airbag 3 is filled into the protective airbag 52, and the protective airbag 52 is extended to the outside of the protective plate 51, thereby sealing the top of the detection chamber 1. The detection chamber 1 is sealed by the protective airbag 52, avoiding the risk of concrete fragments flying around.

[0047] See also Figure 4 and Figure 5The top of the airbag 3 is equipped with multiple first exhaust valves 6. Air channels 7 are arranged around the inner periphery of the airbag 3, communicating with the airbag 3 through second exhaust valves (not shown). A perforated support plate 8 is provided at the bottom of the detection chamber 1, and a through-slot 11 is also formed in the bottom of the detection chamber 1. After the pressure is applied, the gas within the protective airbag 52 is refilled into the airbag 3, causing it to inflate again. This allows the crushed concrete fragments to be collected inside the airbag 3 for easy cleaning. Simultaneously, by opening the first exhaust valves 6 and releasing the gas within the airbag 3, concrete debris adhered to the pressure plate of the load mechanism 2 is removed. When large concrete blocks are manually removed, the fine debris remaining in the detection chamber 1 is difficult to clean. At this point, the second exhaust valve is opened, allowing the remaining gas within the airbag 3 to be ejected through the exhaust channels 7, ejecting any remaining small debris from the airbag 3 through the holes and out of the detection chamber 1.

[0048] See also Figure 8 , also includes a detection component 9, the detection component 9 includes a CCD camera 91 arranged in the detection chamber 1 and a driving unit 92 for driving the CCD camera 91 to move up and down, the pressure sensor, strain gauge and CCD camera are all electrically connected to the controller; the driving unit 92 includes a cylinder 921 and a support plate 922 connected to the piston rod of the cylinder 921, a slide groove is provided on the detection chamber 1, the support plate 922 is slidably connected to the slide groove, the CCD camera 91 is arranged on the support plate 922, the cylinder 921 is connected to the airbag 3 through a pipe, a second solenoid valve is provided on the pipe, and the second solenoid valve is electrically connected to the controller.

[0049] Detailed operating principle: The CCD camera is used to observe and record the formation of cracks. When pressure is applied, the second solenoid valve is controlled to allow some of the gas in the airbag 3 to flow into the cylinder 921. The piston rod of the cylinder 921 drives the support plate 922 upward, extending the CCD camera 91 to monitor the crack changes during the compression of the test piece 4. When the values detected by the pressure sensor and strain gauge exceed the threshold, the controller controls the second solenoid valve to allow the gas in the cylinder 921 to return to the airbag 3, causing the CCD camera 91 to retract.

[0050] In order to better implement the above concrete quality detection device, the present invention also provides a concrete quality detection method, including applying a concrete quality detection device, comprising the following steps:

[0051] Step S10: manually placing the concrete specimen 4 to be tested into the detection chamber 1 in the airbag 3, starting the air pump to fill the airbag 3 with high-pressure gas to expand the airbag 3, and adjusting the position of the specimen 4;

[0052] Step S20: Controlling the load mechanism 2 to apply pressure to the test piece 4, and then controlling the first and second solenoid valves to allow the gas in the airbag 3 to be filled into the protective airbag 52 and the cylinder 921, respectively, causing the protective airbag 52 to extend, sealing the test chamber 1. The piston rod of the cylinder 921 extends, driving the CCD camera 91 upward to monitor crack changes in the test piece 4.

[0053] Step S30: When the value detected by the strain gauge or pressure sensor exceeds the threshold, the controller controls the second solenoid valve to allow the gas in the cylinder 921 to flow back into the airbag 3. The piston rod of the cylinder 921 drives the CCD camera 91 downward, and the airbag 3 expands and moves upward.

[0054] Step S40: After the specimen 4 is crushed, the controller controls the first solenoid valve to allow the gas in the protective airbag 52 to flow back into the airbag 3, and the large pieces of the specimen are manually removed;

[0055] Step S50 : Open the first exhaust valve 6 and the second exhaust valve to clean small debris in the airbag 3 and the pressure plate of the load mechanism 2 .

[0056] Furthermore, in step S20 , when applying pressure to the test piece 4 , it is necessary to apply pressure intermittently so as to maintain a constant pressure within a period of time.

[0057] The above is only an embodiment of the present invention, and the common knowledge such as the specific structure and characteristics of the scheme is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A concrete quality detection method, comprising a concrete quality detection device, comprising a detection chamber (1) with an opening at the top and a load mechanism (2) provided on the detection chamber (1), and further comprising: An airbag (3), wherein the airbag (3) is an annular airbag (3), and the shape of the inner side of the airbag (3) after being inflated is the same as the shape of the test piece (4); an air pump, wherein the air pump is connected to the airbag (3) through a pipeline; and further comprising a protective component (5) symmetrically arranged on the top of the detection chamber (1), wherein the protective component (5) comprises a protective plate (51) and a protective airbag (52), wherein the protective plate (51) is symmetrically arranged on the top of the detection chamber (1), wherein the protective airbag (52) is arranged inside the protective plate (51), and wherein the protective airbag (52) extends out of the protective plate (51) after being inflated, and wherein the protective airbag (52) is connected to the airbag (3) through a pipeline, wherein a first electromagnetic valve is provided on the pipeline; a plurality of first exhaust valves (6) are provided on the top of the airbag (3); and an air jet tunnel (7) is provided around the inner side of the airbag (3), wherein the air jet tunnel (7) is connected to the airbag (3) through a second exhaust valve. 3) connected; a supporting plate (8) with holes is provided at the bottom of the detection chamber (1), and a through groove (11) is opened at the bottom of the detection chamber (1); it also includes a detection component (9), the detection component (9) includes a pressure sensor provided on the load mechanism (2) and a strain gauge provided on the test piece (4); it also includes a CCD camera (91) provided in the detection chamber (1) and a drive unit (92) for driving the CCD camera (91) to move up and down, the pressure sensor, the strain gauge and the CCD camera are all electrically connected to the controller; the drive unit (92) includes a cylinder (921) and a support plate (922) connected to the piston rod of the cylinder (921), the CCD camera (91) is provided on the support plate (922), the cylinder (921) is connected to the airbag (3) through a pipeline, a second electromagnetic valve is provided on the pipeline, and the second electromagnetic valve is electrically connected to the controller; It is characterized by comprising the following steps: Step S10: manually placing the concrete specimen to be tested into the detection chamber inside the airbag, starting the air pump to fill the airbag with high-pressure gas to expand it, and adjusting the position of the specimen; Step S20: Controlling the load mechanism to apply pressure to the test piece, and then controlling the first solenoid valve and the second solenoid valve to allow the gas in the airbag to be filled into the protective airbag and the cylinder, respectively, causing the protective airbag to extend and seal the test chamber. The piston rod of the cylinder extends, driving the CCD camera upward to monitor crack changes in the test piece. Step S30: When the value detected by the strain gauge or pressure sensor exceeds the threshold, the controller controls the second solenoid valve to allow the gas in the cylinder to flow back into the airbag, and the cylinder piston rod drives the CCD camera downward, and the airbag expands and moves upward; Step S40: After the specimen is crushed, the controller controls the first solenoid valve to allow the gas in the protective airbag to flow back into the airbag, and large pieces of the specimen are manually removed; Step S50: Open the first exhaust valve and the second exhaust valve to clean small debris inside the airbag and the pressure plate of the load mechanism.

2. A concrete quality detection method according to claim 1, characterized in that: In step S20, when applying pressure to the test piece, it is necessary to apply pressure intermittently so as to maintain a constant pressure within a period of time.

3. A concrete quality detection method according to claim 1, characterized in that: The detection chamber (1) is provided with a slide groove, and the support plate (922) is slidably connected to the slide groove.

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