Concrete impermeability test device for hydraulic engineering quality detection

Abstract

The invention belongs to the technical field of concrete testing, and particularly relates to a concrete impermeability test device for hydraulic engineering quality detection, the concrete impermeability test device comprises a rack, a plurality of groups of placing parts and a pressurizing part, test pieces are placed in the placing parts, the placing parts are detachably mounted on the rack, and the pressurizing part is detachably mounted on the rack; a plurality of supporting columns of the supporting assembly are evenly distributed on the rack, stable supporting is formed on the press-fitting assembly, and a horizontal plate is prevented from inclining and shaking in the press-fitting process. The position of the horizontal plate can be firmly limited through cooperation of the lead screw and the lead screw nut, part displacement during press fitting is prevented, the structural stability in the test operation process is guaranteed, and potential safety hazards are reduced.

Description

Technical Field

[0001] This invention belongs to the field of concrete testing technology, specifically relating to a concrete impermeability testing device for quality testing of water conservancy projects. Background Technology

[0002] In the field of water conservancy engineering construction, the impermeability of concrete is one of the core indicators for measuring project quality, directly affecting the seepage prevention effect and long-term durability of water conservancy facilities such as dikes, canals, and sluices. Therefore, before and during the construction of water conservancy projects, it is necessary to test the impermeability of concrete specimens using professional impermeability testing equipment to ensure that the concrete materials meet the engineering design requirements. Currently, the commonly used concrete permeability testing equipment in the industry consists of a fixed frame, an integrated test mold (placement section), and a simple pressure structure. In practical applications, it has the following significant drawbacks: the specimens are easily damaged during disassembly, affecting subsequent analysis.

[0003] Because concrete specimens may bleed and segregate during the molding process, the specimen surface easily forms an adhesive force with the inner wall of the mold. Existing monolithic molds require tools such as pry bars and hammers forcibly peeling them off during disassembly, which is not only time-consuming but also prone to causing edge damage and surface cracking, compromising the specimen's integrity. Severe damage to the specimen may directly affect the accuracy of the impermeability test results and may even necessitate the re-preparation of the specimen, increasing testing costs and time. In summary, the existing concrete permeability testing devices have shortcomings in terms of operational flexibility and specimen protection, and there is an urgent need for a new type of permeability testing device that can solve the above-mentioned problems. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing a concrete impermeability testing device for quality testing in water conservancy projects.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a concrete impermeability testing device for quality testing of water conservancy projects, comprising a frame, an array placement section, and a pressurizing section, wherein the specimen is placed in the placement section and is detachably installed on the frame, and the pressurizing section is detachably installed on the frame.

[0006] Preferably, the placement part includes a first placement component and a second placement component, the first placement component is mounted on the frame, and the second placement component is detachably connected to the first placement component.

[0007] Preferably, the first placement component includes a ring, the bottom surface of which is fixedly connected to the top surface of the frame, and fixing blocks are fixedly installed on the outer end faces of both the front and rear ends of the ring, with a first screw hole opened on one side of the fixing block.

[0008] Preferably, the second placement component includes two half-cylinders, with L-shaped blocks fixedly installed at the front and rear ends of the outer end face of the half-cylinders, a second screw hole opened on one side of the L-shaped block, and a handle fixedly installed on the outer end face of the half-cylinder.

[0009] Preferably, the pressurizing part includes a support assembly and a pressing assembly, the support assembly being mounted on the frame, and the pressing assembly being detachably connected to the support assembly.

[0010] Preferably, the support assembly includes several vertical support columns, the bottom end of which is fixedly connected to the top surface of the frame, and a lead screw is fixedly installed on the top surface of the support column.

[0011] Preferably, the press-fitting assembly includes a horizontal plate with several through holes on its top surface. A lead screw passes through the through holes, the diameter of the support column is larger than the diameter of the through holes, and an array of pressing components are rotatably mounted on the horizontal plate.

[0012] Preferably, the pressing component includes several threaded holes on the top surface of the horizontal plate, a threaded rod is provided in the threaded holes with internal thread engagement, a pressing block is fixedly installed at the bottom end of the threaded rod, and a rotating block is fixedly installed at the top end of the threaded rod.

[0013] Compared with the prior art, the advantages and positive effects of the present invention are as follows: (1) The specimen installation and disassembly operations are flexible and convenient, and adaptable to different test scenarios: The device provides a variety of specimen installation operation methods. The specimen can be placed in the placement part and then installed as a whole on the frame, or the placement part can be installed first and then the specimen can be pressed in, which can adapt to different test process requirements. The design of the placement part being divided into the first and second placement components further enhances the flexibility. The second placement component can be installed first and then the specimen can be placed, or the specimen can be placed first and then the second placement component can be assembled with the first placement component. The operation process can be flexibly adjusted according to the actual test conditions, reducing the operation threshold. (2) The efficiency of specimen disassembly is greatly improved, avoiding the adsorption problem of traditional mold: The second placement component adopts a structure of two half-cylinders. During disassembly, the half-cylinder can be directly taken out from the ring and separated from the specimen, which effectively solves the surface adsorption problem between the specimen and the mold caused by water seepage and segregation in the prior art. There is no need to use additional tools to peel off the specimen, which greatly shortens the disassembly time, reduces the risk of specimen damage due to disassembly operation, and ensures the integrity of the specimen. (3) The pressurization section is designed to be precise and controllable and adaptable to different specifications of specimens: The pressurization component of the pressurization section can precisely control the downward movement distance of the pressurization block by rotating the rotating block through the cooperation of the threaded rod and the threaded hole, so as to achieve slow and uniform pressurization of the specimen, ensuring that the bottom surface of the specimen is tightly attached to the top surface of the frame, and avoiding specimen damage or poor adhesion due to uneven pressurization force; the horizontal plate has two installation methods and the height can be adjusted by the screw nut, which can adapt to concrete specimens of different heights and specifications, and improve the versatility of the device; (4) The structure is highly detachable, making it easy to maintain and store: The placement part and the pressurizing part of the device are detachably connected to the frame. The pressing components and the support components are also detachable. Each component is easy to disassemble and assemble. After the test, the components can be disassembled and stored to save storage space. At the same time, the detachable structure makes it easy to clean, inspect and replace each component (such as replacing the aging seal ring, lubricating the threaded rod, etc.), extending the overall service life of the device and reducing maintenance costs. (5) The support structure is stable and reliable, ensuring the safety of the test operation: The support components are evenly distributed on the frame to form a stable support for the pressing components, avoiding the horizontal plate from tilting or shaking during the pressing process; the screw and screw nut can firmly limit the position of the horizontal plate, prevent the displacement of components during pressing, ensure the structural stability during the test operation, and reduce safety hazards. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below: Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ; Figure 3 This is the front view of the present invention; Figure 4 This is a side view of the present invention; Figure 5 This is a schematic diagram of the installation of the support components and the rack; Figure 6 This is a structural diagram of the press-fit assembly; Figure 7 This is an enlarged view of the structural schematic diagram of the second placement component; Figure 8 yes Figure 1 A magnified view of part A.

[0015] Explanation of reference numerals in the attached figures: 1. Frame; 2. Ring; 3. Fixing block; 4. First screw hole; 5. Half cylinder; 6. L-shaped block; 7. Second screw hole; 8. Support column; 9. Lead screw; 10. Horizontal plate; 11. Threaded rod; 12. Press-in block; 13. Rotating block. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0018] Example 1 The following is combined with Figures 1-8 The concrete impermeability testing device for quality testing of hydraulic engineering in Example 1 is further described below, such as... Figure 1 As shown, it includes a frame 1, an array placement section, and a pressurizing section. The placement section holds the test specimen and is detachably mounted on the frame 1. The pressurizing section is also detachably mounted on the frame 1.

[0019] Several water outlets are opened on the top surface of the frame 1. The separator, water pump, water storage tank, electrical control system, etc. are installed inside the frame 1. Using existing known technology, the water outlets have been purged of air before the specimen is placed. The installation methods of the placement part and the specimen are as follows: First operation method: the specimen is placed in the placement part, and then the placement part and the specimen are installed together on the frame 1. The specimen is pushed downward by the pressurizing part so that the specimen contacts the top surface of the frame 1, and then the impermeability test is carried out; Second operation method: the placement part is installed on the frame 1, and then the specimen is placed on the placement part. The specimen is slowly pressed into the placement part by the pressurizing part, and then the impermeability test is carried out.

[0020] like Figure 1 , Figure 2 , Figure 4 and Figure 7 As shown, the placement part includes a first placement component and a second placement component. The first placement component is mounted on the frame 1, and the second placement component is detachably connected to the first placement component.

[0021] The first placement component is fixedly installed on the frame 1. Then the specimen is placed into the second placement component, and then the second placement component and the specimen are installed onto the first placement component. Alternatively, the second placement component can be installed onto the first placement component first, and then the specimen can be placed into the second placement component. Different operating methods can be performed.

[0022] like Figure 2 As shown, the first placement component includes a ring 2, the bottom surface of the ring 2 is fixedly connected to the top surface of the frame 1, and fixing blocks 3 are fixedly installed on the outer end faces of both the front and rear ends of the ring 2. A first screw hole 4 is opened on one side of the fixing block 3.

[0023] The center of the ring 2 is placed concentrically with the water outlet. The second placement component is placed inside the ring 2, and the parts on the second placement component are connected to the fixing block 3, thus connecting the second placement component to the ring 2.

[0024] like Figure 7As shown, the second placement component includes two half-cylinders 5. L-shaped blocks 6 are fixedly installed at the front and rear ends of the outer end face of the half-cylinders 5 respectively. A second screw hole 7 is opened on one side of the L-shaped block 6. A handle is fixedly installed on the outer end face of the half-cylinders 5.

[0025] Two half-cylinders 5 can be joined together to form a whole cylinder. Sealing strips are embedded at the contact points of the two half-cylinders 5. An annular sealing ring is installed between the half-cylinder 5 and the ring 2. A sealing ring is also placed between the cylinder joined together by the two half-cylinders and the specimen. After assembling the two half-cylinders 5, they are placed inside the ring 2. At this time, the horizontal block of the L-shaped block 6 is above the ring 2, and the vertical block of the L-shaped block 6 is outside the ring 2. The first screw hole 4 and the second screw hole 7 are concentric. Then, a bolt is passed through the first screw hole 4 and the second screw hole 7, which are on the same horizontal axis, to connect the half-cylinder 5 and the ring 2 together. The specimen is installed inside the half-cylinder. When disassembling, after the half-cylinder 5 is taken out from the ring 2, the half-cylinder 5 can be directly separated from the specimen. Compared with the existing method, which is more convenient due to the surface adsorption caused by water seepage or segregation between the specimen and the mold.

[0026] like Figure 1 , Figure 5 , Figure 6 As shown, the pressurizing part includes a support assembly and a pressing assembly. The support assembly is mounted on the frame 1, and the pressing assembly is detachably connected to the support assembly.

[0027] After the specimen and placement part are installed on the frame 1, the pressing assembly is then installed on the support assembly to press the specimen in so that the bottom surface of the specimen is in contact with the top surface of the frame 1.

[0028] like Figure 5 As shown, the support assembly includes several vertical support columns 8, the bottom ends of which are fixedly connected to the top surface of the frame 1, and lead screws 9 are fixedly installed on the top surface of the support columns 8. The support columns 8 are evenly distributed on the frame 1, and the support columns 8 support the press-fitting assembly.

[0029] like Figure 6 As shown, the press assembly includes a horizontal plate 10 with several through holes on its top surface. A lead screw 9 passes through the through holes, and the diameter of the support column 8 is larger than the diameter of the through holes. An array of pressing components is rotatably mounted on the horizontal plate 10.

[0030] The first installation method for the horizontal plate involves installing the horizontal plate 10 onto the lead screw 9, with the lead screw 9 passing through the corresponding through hole, so that the horizontal plate 10 contacts the support column 8. Then, a lead screw nut is installed on the lead screw 9, and the lead screw nut contacts the top surface of the horizontal plate 10, thus defining the horizontal plate 10. The second installation method involves first rotating and installing the lead screw nut on the lead screw 9, and then allowing the lead screw 9 to pass through the through hole of the horizontal plate 10, with the bottom surface of the horizontal plate 10 contacting the top surface of the lead screw nut. Then, a lead screw nut is installed on the lead screw. The two lead screw nuts on the same lead screw define the horizontal plate 10. The height of the horizontal plate 10 can be adjusted as needed. Different installation methods can be selected according to requirements during use.

[0031] like Figure 6 As shown, the pressing component includes several threaded holes on the top surface of the horizontal plate 10, a threaded rod 11 is provided in the threaded holes with internal thread engagement, a pressing block 12 is fixedly installed at the bottom end of the threaded rod 11, and a rotating block 13 is fixedly installed at the top end of the threaded rod 11.

[0032] Rotating the rotating block 13 and engaging the threaded rod 11 with the threaded hole allows the threaded rod to rotate downwards, causing the pressing block 12 to move downwards. The pressing block 12 then contacts the top surface of the specimen, slowly pressing the specimen into the cylinder formed by the assembly of two halves of the cylinder.

[0033] A concrete impermeability test method for quality inspection in water conservancy projects, the process of which is as follows: Step 1: Preparation before the experiment (1) Equipment inspection and debugging: ① Check whether the known components such as the separator, water pump, water tank, and electrical control system inside the frame 1 are operating normally; confirm that the air removal operation has been completed at each water outlet on the top surface of the frame 1 to ensure that there is no air residue in the water system (the test water is clean water that meets the standards) and ensure that there is no residual air at the water outlet that affects the test accuracy; ② Check all components (ring 2, fixing block 3, half cylinder 5, L-shaped block 6, support column 8, lead screw 9, horizontal plate 10, threaded rod 11, etc.) of the placement part (first placement component, second placement component) and the pressurizing part (support component, press-fit component) to ensure that no parts are missing, rusted or stripped; ③Preparation of sealing rings: Prepare the sealing strip at the joint of the half-cylinder, the annular sealing ring between the half-cylinder and the ring, and the sealing ring between the joined cylinder and the test piece. Check that all sealing rings are undamaged and undeformed to ensure sealing performance. (2) Specimen preparation: ①Specimen specifications: Use 6 frustum specimens with an upper inner diameter of 175mm, a lower inner diameter of 185mm, and a height of 150mm. ②Preparation and curing: Prepare according to the "Standard for Test Methods of Physical and Mechanical Properties of Concrete" GB / T 50081. After molding, cure with the mold. After demolding, remove the cement slurry film on both ends with a wire brush and send it to the standard curing room for curing for 28 days. ③ Specimen pretreatment: Remove the specimens from the curing room one day before the test, wipe them clean and let them air dry; the specimen surface should be free of obvious defects and damage; Step 2: Assembly of the placement section and installation of the test specimen (1) Specimen sealing operation ① Select paraffin wax and rosin as the sealing material (the mass ratio of paraffin wax to rosin is 4:1). Apply the sealing material evenly to the side of the specimen, with the thickness controlled at 1-2 mm. ② The second placement component (two half-cylinders 5) is assembled into a whole cylinder. A sealing strip is embedded at the joint, and a sealing ring is placed at a preset position on the inner wall to ensure a tight and gapless fit. ③ Slowly place the sealed specimen into the integral cylinder, ensuring that the specimen fits tightly against the sealing ring without any offset or tilt; (2) Assembly of the placement section ① Hold the handle of half of the cylinder and place the whole cylinder containing the test specimen into the ring 2 on the frame 1, ensuring that the center of the ring 2 is concentric with the outlet of the frame 1; ② Adjust the position of half cylinder 5 so that the horizontal block of L-shaped block 6 is above the ring 2 and the vertical block is outside the ring 2. Ensure that the first screw hole 4 on the fixing block 3 and the second screw hole 7 on the L-shaped block 6 are concentric. Pass the bolt through the first screw hole 4 and the second screw hole 7 on the same horizontal axis, tighten the bolt, and complete the fixing of the second placement component and the first placement component (ring 2). ③ Check that the annular sealing ring between the half-cylinder 5 and the ring 2 is properly fitted, and confirm that the part containing the test piece is fitted with the top surface of the frame 1 without any looseness, offset, or gaps; Step 3: Assembly of the pressure section and pressing of the specimen ① Support component inspection: Confirm that the bottom ends of several vertical support columns 8 are fixedly connected to the top surface of the frame 1, the support columns 8 are evenly distributed on the frame 1, and the lead screw 9 is fixedly connected to the top surface of the support column 8 without any looseness; ② Align the through hole of the horizontal plate 10 with the lead screw 9, so that the lead screw 9 passes through the through hole until the bottom surface of the horizontal plate 10 contacts the top surface of the support column 8; screw the lead screw nut into the lead screw 9 and tighten the nut until its bottom surface contacts the top surface of the horizontal plate 10, thus completing the definition of the horizontal plate 10. ③ Specimen pressing operation: Rotate the pressing component rotating block 13 on the horizontal plate 10, which drives the threaded rod 11 to rotate downward along the threaded hole of the horizontal plate 10. The pressing block 12 at the bottom of the threaded rod 11 moves downward accordingly. After the pressing block 12 contacts the top surface of the specimen, continue to slowly rotate the rotating block 13 so that the pressing block 12 pushes the specimen downward until the bottom surface of the specimen is completely in contact with the top surface of the frame 1, and then stop rotating. During the process, maintain uniform pressure to avoid damage to the specimen due to excessive force. Step 4: Perform the permeability test ① Start the internal electrical control system of frame 1, and inject water into the outlet through the water pump and water tank. According to the standard requirements, raise the water pressure to 1.2±0.05MPa within 5 minutes and keep it constant. The time to reach the stable pressure is the start time of the test, and the pressure is maintained for 24 hours. ②During the test, continuously observe the water seepage at the end face of the specimen. If there is no water seepage at the end face of the specimen, maintain the pressure for 24 hours and then stop the test. Step 5: Measurement of specimen breakage and water seepage height ① After the test, turn off the control system and release the pressure. Rotate the rotating block 13 in the opposite direction. Driven by the threaded rod 11, press the block 12 to separate from the specimen. Then unscrew the screw nut on the screw 9 to remove the horizontal plate 10. Then unscrew the bolt to remove the whole cylinder. After splitting the cylinder in half, remove the specimen (to avoid the problem of the specimen adhering to the mold due to water seepage / separation). The disassembly of the press assembly is completed. ② Place the specimen on the press, and place a 6mm steel pad at the center of each end face of the specimen along the diameter direction (ensure they are on the same vertical plane). Start the press to split the specimen in half along the longitudinal section. ③ Use a waterproof pen to trace the water marks on the split surface of the specimen, attach the trapezoidal plate to the split surface, and use a steel ruler to measure the water seepage height at 10 measuring points at equal intervals along the water marks, with the readings accurate to 1mm.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A concrete impermeability testing device for quality testing of hydraulic engineering projects, characterized in that, It includes a frame (1), an array placement section, and a pressurizing section. The placement section holds the test specimen and is detachably mounted on the frame (1). The pressurizing section is detachably mounted on the frame (1).

2. The concrete impermeability testing device for quality testing of water conservancy projects according to claim 1, characterized in that, The placement part includes a first placement component and a second placement component. The first placement component is mounted on the frame (1), and the second placement component is detachably connected to the first placement component.

3. The concrete impermeability testing device for quality testing of water conservancy projects according to claim 2, characterized in that, The first placement component includes a ring (2), the bottom surface of the ring (2) is fixedly connected to the top surface of the frame (1), and fixing blocks (3) are fixedly installed on the outer end surfaces of the front and rear ends of the ring (2), and a first screw hole (4) is opened on one side of the fixing block (3).

4. The concrete impermeability testing device for quality testing of water conservancy projects according to claim 3, characterized in that, The second placement component includes two half-cylinders (5), with L-shaped blocks (6) fixedly installed at the front and rear ends of the outer end face of the half-cylinders (5), and a second screw hole (7) opened on one side of the L-shaped block (6). A handle is fixedly installed on the outer end face of the half-cylinders (5).

5. A concrete impermeability testing device for quality testing of water conservancy projects according to claim 4, characterized in that, The pressurizing part includes a support component and a pressing component. The support component is mounted on the frame (1), and the pressing component is detachably connected to the support component.

6. The concrete impermeability testing device for quality testing of water conservancy projects according to claim 5, characterized in that, The support assembly includes several vertical support columns (8), the bottom end of the support column (8) is fixedly connected to the top surface of the frame (1), and a lead screw (9) is fixedly installed on the top surface of the support column (8).

7. A concrete impermeability testing device for quality testing of water conservancy projects according to claim 6, characterized in that, The press assembly includes a horizontal plate (10), with several through holes on the top surface of the horizontal plate (10), through which a lead screw (9) passes, and a support column (8) with a diameter greater than that of the through holes. An array of pressing components is rotatably mounted on the horizontal plate (10).

8. A concrete impermeability testing device for quality testing of water conservancy projects according to claim 7, characterized in that, The pressing component includes several threaded holes on the top surface of the horizontal plate (10), a threaded rod (11) is provided in the threaded hole with threaded engagement, a pressing block (12) is fixedly installed at the bottom end of the threaded rod (11), and a rotating block (13) is fixedly installed at the top end of the threaded rod (11).

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