A concrete air tightness magnification testing device

Abstract

The utility model discloses a kind of concrete air tightness amplification testing device, it includes: embedded part, it includes sleeve joint section and is used for embedding the embedded section of measured member;Top cover, it is matched with sleeve joint section, and the region on the top inner side surface and the upper end of sleeve joint section is inlaid is equipped with first sealing groove;First sealing ring, it is located in first sealing groove, and make the top inner side wall of top cover and the upper end surface of sleeve joint section between sealing connection;Vacuum pump, it is communicated with the inside of top cover by conduit, before testing, embedded part is poured into jar shape with the concrete to be measured, and the sleeve joint section of concrete test piece embedded part is exposed in the concrete test piece formed by pouring;Subsequently, top cover and the sleeve joint section of embedded part are screwed;Make conduit, top cover, embedded part, and form sealed space between concrete test piece, start vacuum pump and carry out vacuumization to first cavity.Sealing stability is significantly improved, avoid the failure problem of traditional temporary sealing.

Description

Technical Field

[0001] This utility model belongs to the field of concrete performance testing technology, and specifically relates to a concrete airtightness amplification testing device. Background Technology

[0002] Concrete, due to its low cost and structural stability, is widely used in chemical, building materials, and grain storage industries. Its airtightness directly determines the safety (e.g., preventing leakage of volatile materials) and efficiency (e.g., preventing moisture absorption and deterioration of moisture-proof materials). Currently, the industry's airtightness testing of concrete tanks largely relies on traditional methods of "temporary sealing + simple pressure measurement," which have significant drawbacks. These methods depend on rubber membrane covering, pressure ring fixing, or sealant application for temporary sealing, which is prone to gaps due to aging and wrinkling of the rubber membrane, uneven sealant application, or insufficient curing, resulting in poor sealing reliability. Furthermore, the use of pointer-type pressure gauges to indirectly estimate vacuum levels leads to large data acquisition errors and an inability to record pressure changes in real time, only qualitatively determining whether there is a significant pressure drop, making it difficult to quantify the sealing performance level. Additionally, the installation and disassembly of temporary sealing structures are time-consuming, sealing materials are mostly disposable, and the testing cycle for a single tank is long, resulting in low operational efficiency and difficulty in meeting the needs of batch testing. To address these issues, there is an urgent need for a concrete airtightness testing device with a stable sealing structure, accurate test data, and convenient operation to fill the technological gap in the industry. Summary of the Invention

[0003] The purpose of this invention is to provide a more widely applicable amplification testing device for the air tightness of concrete.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is: a concrete airtightness amplification testing device, comprising:

[0005] Embedded parts, including socket sections and embedded sections for embedding the part to be tested;

[0006] The top cover is fitted onto the sleeve segment and fixedly connected to the sleeve segment, and a first sealing groove is provided on the inner side of its top surface in the area that fits against the upper end of the sleeve segment.

[0007] The first sealing ring is disposed in the first sealing groove and provides a sealing connection between the top inner wall of the top cover and the upper end face of the sleeve section.

[0008] A vacuum pump, which is connected to the interior of the top cover via a conduit, is used to evacuate the first cavity formed between the top cover, the embedded part, and the concrete test piece after the top cover is connected and fixed to the embedded part.

[0009] An air nozzle is provided on the top cover and enables the conduit to be quickly and sealingly connected to the top cover;

[0010] A vacuum gauge, which is mounted on the conduit;

[0011] Before testing, the embedded part and the concrete to be tested are poured into a tank shape, with the sleeve section of the embedded part of the concrete test piece exposed in the poured concrete test piece; then the top cover and the sleeve section of the embedded part are tightened; a sealed space is formed between the conduit, the top cover, the embedded part and the concrete test piece, and the vacuum pump is started to evacuate the first chamber.

[0012] In another embodiment, the device further includes a vacuum valve disposed on a conduit between the vacuum gauge and the vacuum pump; the vacuum valve facilitates the operation of evacuating the first chamber.

[0013] In another embodiment, the embedded section is 1 / 3 to 2 / 3 of the length of the embedded part; the optimal length is 1 / 2, to ensure that the embedded section can be cast integrally with the concrete test piece to form a rigid connection.

[0014] In another embodiment, the outer diameter of the sleeve segment is smaller than the outer diameter of the embedded segment. When the sleeve segment is fixedly connected to the top cover, the lower end face of the top cover presses against the upper end face of the embedded segment. A sealing surface is also formed between the lower end face of the top cover and the upper end face of the embedded segment, further improving the sealing effect.

[0015] In another embodiment, the outer diameter of the top cover is larger than the outer diameter of the embedded section; the outer ring of the top cover can press against the upper surface of the concrete test piece, and the upper surface of the concrete test piece provides a certain reaction force to the top cover to ensure the connection strength between the top cover and the sleeve section.

[0016] In another embodiment, an annular second sealing groove is provided on the lower end face of the top cover, and a second sealing ring is provided in the second sealing groove; the second sealing ring is provided between the lower end face of the top cover and the lower end face of the top cover to further improve the sealing effect.

[0017] In another embodiment, the inner ring of the second sealing ring is pressed against the upper end surface of the embedded section, and the outer ring of the second sealing ring extends radially outward beyond the upper end surface of the embedded section; the second sealing ring extends to the upper end surface of the concrete test piece, eliminating air leakage between the embedded section and the concrete test piece, even if such air leakage has only a very small probability.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0019] (1) Significantly improved sealing stability: Through the rigid connection of "embedded parts + top cover", combined with nitrile rubber sealing ring, a dual sealing structure of "mechanical seal + elastic seal" is formed, avoiding the problem of easy failure of traditional temporary seals;

[0020] (2) High test accuracy and quantifiable: The digital absolute pressure vacuum gauge can collect air pressure data in real time with an accuracy of 0.2 grade. It can capture small air pressure changes (such as fluctuations at the 0.0005MPa level) and quantify the air tightness level through data recording.

[0021] (3) Easy to operate and low cost: The top cover and the embedded parts are detachable. During installation, only a torque wrench is needed to tighten them. During disassembly, they can be rotated in the opposite direction. The test cycle of a single tank is shortened to less than 1.5 hours. Moreover, all parts can be reused, and there is no need to consume disposable sealing materials, reducing the test cost by more than 60%.

[0022] (4) Strong structural safety: The embedded parts are cast as one piece with the concrete tank body, with a tensile strength ≥20MPa, avoiding the risk of the sealing structure separating from the tank body during testing. At the same time, the thickness of the top cover is adapted to the vacuum pressure, with no risk of deformation or cracking. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the device in Embodiment 1;

[0024] Figure 2 This is a cross-sectional view of the device in Embodiment 1;

[0025] Figure 3 This is a schematic diagram of the structure of the device in Embodiment 2;

[0026] Figure 4 This is a cross-sectional view of the device in Embodiment 2;

[0027] Figure 5 This is a bottom view of the top cover in Embodiment 2. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0029] like Figure 1-2 As shown, the concrete air tightness amplification test device includes: embedded part 1, top cover 2, first sealing ring 3, vacuum pump 4, conduit 5, air nozzle 6, vacuum gauge 7, and vacuum valve 8.

[0030] The embedded part 1 includes a threaded sleeve section 9 on its outer circumferential surface and an embedded section 10 for embedding the test piece; the inner circumferential surface of the top cover 2 is threaded to the sleeve section 9, and a first sealing groove 11 is provided on the inner side of its top surface that is in contact with the upper end of the sleeve section 9; multiple torque-bearing surfaces 13 are formed on the outer circumferential surface of the top cover 2 or the outer circumferential surface of the air nozzle 6; a first sealing ring 3 is provided in the first sealing groove 11, and a sealing connection is made between the inner side wall of the top cover and the upper end face of the sleeve section 9; a vacuum pump 4 is connected to the interior of the top cover 2 through a conduit 5, and is used to evacuate the first cavity 14 formed between the top cover 2, the embedded part 1, and the concrete test piece 15 after the top cover 2 and the embedded part 1 are threadedly connected and fixed; the air nozzle 6 is provided on the top cover and makes the conduit 5 and the top cover 2 quickly and sealingly connected; a vacuum gauge 7 is installed on the conduit 5; both the top cover 2 and the embedded part 1 are made of steel.

[0031] Specifically, vacuum valve 8 is located on conduit 5 between vacuum gauge 7 and vacuum pump 4; vacuum valve 8 facilitates the vacuuming operation of the first chamber 14. The embedded section 10 is 1 / 3 to 2 / 3 of the length of the embedded part 1; optimally, it is 1 / 2 to ensure that the embedded section 10 can be cast integrally with the concrete test piece 15, forming a rigid connection. The outer diameter of the sleeve section 9 is smaller than the outer diameter of the embedded section 10. When the sleeve section 9 is threadedly fixed to the top cover 2, the lower end face of the top cover 2 presses against the upper end face of the embedded section 10; a sealing surface is also formed between the lower end face of the top cover 2 and the upper end face of the embedded section 10, further improving the sealing effect. The outer diameter of the top cover 2 is larger than the outer diameter of the embedded section 10; the outer ring of the top cover 2 can press against the upper end face of the concrete test piece 15, and the upper end face of the concrete test piece 15 provides a certain reaction force to the top cover 2, ensuring the connection strength between the top cover 2 and the sleeve section 9.

[0032] Before testing, the embedded part 1 and the concrete to be tested are poured into a tank shape. During testing, the first sealing ring 3 is fitted into the first sealing groove 11 of the top cover 2, ensuring that the first sealing ring 3 fits tightly with the top cover 2 without wrinkles or misalignment. The top cover 2 equipped with the first sealing ring 3 is aligned with the embedded part 1 of the concrete test piece 15, and the top cover 2 is rotated clockwise. The external thread of the embedded part 1 and the internal thread of the top cover 2 are used to achieve initial tightening until the lower surface of the top cover 2 is completely in contact with the upper end face of the embedded section 10. During the rotation, the top cover 2 is kept stable to avoid uneven force on the first sealing ring 3. A calibrated torque wrench is used, and a suitable socket connector is selected to connect to the torque bearing surface 13 of the top cover 2. Apply a clockwise torque at a uniform speed to the preset value (set according to the size and material characteristics of the first sealing ring 3, usually 80-150 N·m). During the application process, observe the contact surface between the top cover 2 and the embedded part 1 to ensure that the first sealing ring 3 is uniformly compressed and there are no visually visible gaps between the contact surfaces. After the torque is applied, hold for 10-15 seconds and then release the torque. After standing for 5 minutes, re-measure the torque value to ensure that the torque attenuation is ≤5% to ensure the stability of the sealing state.

[0033] Open vacuum valve 8 and start vacuum pump 4 to evacuate the tank. Vacuum gauge 7 displays the tank pressure value in real time. When the tank pressure drops to 1000Pa±50Pa, maintain vacuum pump 4 running for pressure holding for 1 hour, recording the pressure value every 10 minutes. The pressure fluctuation should be ≤50Pa. Repeat the operation 2-3 times to remove residual air and adsorbed gases from the concrete pores through multiple vacuuming-pressure holding cycles, ensuring the accuracy of subsequent testing. After pretreatment, start vacuum pump 4 again and open vacuum valve 8 to continue vacuuming until the tank pressure stabilizes at 500Pa±20Pa. Close vacuum valve 8 first, then vacuum pump 4 to disconnect the vacuum system from the tank, creating an independent, sealed space. Vacuum gauge 7 remains connected to the tank to continuously monitor the pressure. After the vacuum system is shut down, vacuum gauge 7 immediately begins recording the tank pressure value in real time, setting the sampling interval to 1 minute and recording continuously for at least 24 hours. The recorded data includes the time point and corresponding pressure value. Based on the recorded pressure-time curve, calculate the pressure rise rate v per unit time (unit: Pa / s). The calculation formula is:

[0034] v = (P2 - P1) / (t2 - t1),

[0035] Where P1 is the initial pressure (500 Pa), t1 is the starting point of timing, and P2 is the pressure value at time t2. The airtightness of the concrete is evaluated based on the pressure rise rate v.

[0036] Example 2

[0037] like Figure 3-5 As shown, the concrete air tightness amplification test device includes: embedded part 1, top cover 2, first sealing ring 3, vacuum pump 4, conduit 5, air nozzle 6, vacuum gauge 7, vacuum valve 8, and second sealing ring 16.

[0038] The embedded part 1 includes a sleeve section 9 and an embedded section 10 for embedding the test piece; a first sealing groove 11 is provided on the area where the top cover 2 and the upper end of the sleeve section 9 are in contact; a first sealing ring 3 is provided in the first sealing groove 11 and seals the inner side wall of the top cover with the upper end face of the sleeve section 9; a vacuum pump 4 is connected to the inside of the top cover 2 through a conduit 5 and is used to evacuate the first cavity 14 formed between the top cover 2, the embedded part 1, and the concrete test piece 15 after the top cover 2 and the embedded part 1 are connected and fixed; an air nozzle 6 is provided on the top cover and makes the conduit 5 and the top cover 2 quickly and sealably connected; a vacuum gauge 7 is installed on the conduit 5; both the top cover 2 and the embedded part 1 are made of steel.

[0039] Specifically, vacuum valve 8 is located on conduit 5 between vacuum gauge 7 and vacuum pump 4; vacuum valve 8 facilitates the vacuuming operation of the first chamber 14. The embedded section 10 is 1 / 3 to 2 / 3 the length of the embedded part 1; optimally, it is 1 / 2 to ensure that the embedded section 10 can be cast integrally with the concrete test piece 15, forming a rigid connection. A lower flange ring 21 is formed at the top of the circumference of the concrete test piece 15, and an upper flange ring 22 is formed at the bottom of the circumference of the top cover 2. The upper flange ring 22 and the lower flange ring 21 are connected by bolt assembly 23, thereby achieving a fixed connection between the top cover 2 and the embedded part 1 and the concrete test piece 15. The outer diameter of the sleeve section 9 is smaller than the outer diameter of the embedded section 10. When the sleeve section 9 is fixedly connected to the embedded section 10, the lower end face of the top cover 2 presses against the upper end face of the embedded section 10; a sealing surface is also formed between the lower end face of the top cover 2 and the upper end face of the embedded section 10, further improving the sealing effect. The outer diameter of the top cover 2 is larger than the outer diameter of the embedded section 10; the outer ring of the top cover 2 can press against the upper surface of the concrete test piece 15, and the upper surface of the concrete test piece 15 provides a certain reaction force to the top cover 2 to ensure the connection strength between the top cover 2 and the sleeve section 9. An annular second sealing groove 12 is provided on the lower surface of the top cover 2, and a second sealing ring 16 is provided in the second sealing groove 12; the second sealing ring 16 is provided between the lower surface of the top cover 2 and the upper surface of the embedded section 10 and the concrete test piece 15 to further improve the sealing effect. The inner ring of the second sealing ring 16 presses against the upper end face of the embedded section 10, and the outer ring of the second sealing ring 16 extends radially outward beyond the upper end face of the embedded section 10. The second sealing ring 16 extends to the upper end face of the concrete test piece 15, eliminating air leakage between the embedded section 10 and the concrete test piece 15, even if the air leakage has a very low probability. To ensure that the first sealing ring 3 and the second sealing ring 16 are subjected to uniform force, multiple U-shaped connecting channels 17 are formed inside the top cover 2, which are evenly distributed in a divergent pattern around the central axis of the top cover 2. The two ends of the connecting channels 17 are respectively connected to the first sealing groove 11 and the second sealing groove 12. A balance push rod made of shape memory metal is provided in the connecting channel 17. 18. When the balance push rod 18 is subjected to pressure from the first sealing ring 3 or the second sealing ring 16, it will transfer the pressure to the other sealing ring. In order to improve the synchronization of the first sealing ring 3 or the second sealing ring 16 under force, a first push ring 19 matching the first sealing groove 11 is provided in the first sealing groove 11, and a second push ring 20 matching the second sealing groove 12 is provided in the second sealing groove 12. When one of the push rings is squeezed by the corresponding sealing ring, the squeezing force is transferred to the other push ring through the balance push rod 18, and then the other push ring pushes the other sealing ring, so that the two sealing rings are subjected to balanced force when fixing the top cover 2 to the embedded part 1, thereby ensuring that the two sealing rings have a better sealing effect on their respective splicing surfaces.

[0040] Before testing, the embedded part 1 and the concrete to be tested are poured into a tank shape. During testing, the first sealing ring 3 is fitted into the first sealing groove 11 of the top cover 2, ensuring that the first sealing ring 3 fits tightly with the top cover 2 without wrinkles or misalignment. The top cover 2 equipped with the first sealing ring 3 is aligned with the embedded part 1 of the concrete test piece 15, and the top cover 2 is rotated clockwise to achieve initial tightening using the embedded part 1 and the top cover 2, until the lower surface of the top cover 2 is completely fitted with the upper end surface of the embedded section 10. During the fitting process, the top cover 2 is kept stable. If instability occurs, the balance push rod 18 can balance the first sealing ring 3 and the second sealing ring 16 to avoid uneven force on the first sealing ring 3 and the second sealing ring 16. A calibrated torque wrench is used to control the torque of the bolt assembly 23. Apply clockwise torque at a uniform speed to the preset value (set according to the size and material characteristics of the first sealing ring 3 and the second sealing ring 16). During the application process, observe the contact surface between the top cover 2 and the embedded part 1 to ensure that the first sealing ring 3 and the second sealing ring 16 are uniformly compressed and there are no visually visible gaps between the contact surfaces. After the torque is applied, hold for 10-15 seconds and then release the torque. After standing for 5 minutes, re-measure the torque value to ensure that the torque attenuation is ≤5% to ensure the stability of the sealing state.

[0041] Open vacuum valve 8 and start vacuum pump 4 to evacuate the tank. Vacuum gauge 7 displays the tank pressure value in real time. When the tank pressure drops to 1000Pa±50Pa, maintain vacuum pump 4 running for pressure holding for 1 hour, recording the pressure value every 10 minutes. The pressure fluctuation should be ≤50Pa. Repeat the operation 2-3 times to remove residual air and adsorbed gases from the concrete pores through multiple vacuuming-pressure holding cycles, ensuring the accuracy of subsequent testing. After pretreatment, start vacuum pump 4 again and open vacuum valve 8 to continue vacuuming until the tank pressure stabilizes at 500Pa±20Pa. Close vacuum valve 8 first, then vacuum pump 4 to disconnect the vacuum system from the tank, creating an independent, sealed space. Vacuum gauge 7 remains connected to the tank to continuously monitor the pressure. After the vacuum system is shut down, vacuum gauge 7 immediately begins recording the tank pressure value in real time, setting the sampling interval to 1 minute and recording continuously for at least 24 hours. The recorded data includes the time point and corresponding pressure value. Based on the recorded pressure-time curve, calculate the pressure rise rate v per unit time (unit: Pa / s). The calculation formula is:

[0042] v = (P2 - P1) / (t2 - t1),

[0043] Where P1 is the initial pressure (500 Pa), t1 is the starting point of timing, and P2 is the pressure value at time t2. The airtightness of the concrete is evaluated based on the pressure rise rate v.

[0044] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A scaled-up testing device for the airtightness of concrete, characterized in that: It includes: Embedded parts, including socket sections and embedded sections for embedding the part to be tested; The top cover is fitted onto the sleeve segment and fixedly connected to the sleeve segment, and a first sealing groove is provided on the inner side of its top surface in the area that fits against the upper end of the sleeve segment. The first sealing ring is disposed within the first sealing groove; A vacuum pump, which is connected to the interior of the top cover via a conduit; An air nozzle is located on the top cover; A vacuum gauge is mounted on the conduit.

2. The concrete airtightness amplification testing device according to claim 1, characterized in that: The device also includes a vacuum valve located on a conduit between the vacuum gauge and the vacuum pump.

3. The concrete airtightness amplification testing device according to claim 1, characterized in that: The embedded section is 1 / 3 to 2 / 3 of the length of the embedded part.

4. The concrete airtightness amplification testing device according to claim 1, characterized in that: The outer diameter of the socket segment is smaller than the outer diameter of the embedded segment. When the socket segment is fixedly connected to the top cover, the lower end face of the top cover presses against the upper end face of the embedded segment.

5. The concrete airtightness amplification testing device according to claim 1, characterized in that: The outer diameter of the top cover is larger than the outer diameter of the embedded section.

6. The concrete airtightness amplification testing device according to claim 5, characterized in that: The lower end face of the top cover is provided with an annular second sealing groove, and a second sealing ring is provided in the second sealing groove.

7. The concrete airtightness amplification testing device according to claim 6, characterized in that: The inner ring of the second sealing ring presses against the upper end face of the embedded section, and the outer ring of the second sealing ring extends radially outward beyond the upper end face of the embedded section; the second sealing ring extends to the upper end face of the concrete test piece.

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