Concrete product strength testing device

Abstract

The invention relates to the technical field of concrete product strength testing, in particular to a concrete product strength testing device which is characterized in that an internal pressure mechanism and an external pressure mechanism are jointly arranged on a testing table, and a pressure equalizing mechanism is arranged on the external pressure mechanism; internal pressure and external pressure testing of the concrete pipeline can be performed on the same equipment in sequence or as required, a pipe body does not need to be moved in the detection process, and meanwhile, on the basis of meeting internal and external pressure testing requirements specified by the national standard, the internal and external pressure testing device can also adapt to pipelines with different diameters; a complex stress state of uniform multi-point pressure application of external soil after the pipeline is buried can be simulated, the pressure of each loading point can be independently adjusted according to actual working condition requirements, and meanwhile, a cooperative loading test can be realized with pipeline internal pressure detection; therefore, in a test environment, the highly-reduced pipeline simultaneously bears a composite stress condition of internal fluid pressure and external complex soil mass constraint in an actual working process.

Description

Technical Field

[0001] This invention relates to the field of concrete product strength testing technology, specifically to a concrete product strength testing device. Background Technology

[0002] Concrete products are prefabricated products with specific shapes and functions, made from cement, aggregates and water as the main raw materials through a series of processes such as mixing, molding and curing. Among them, concrete tubular products are widely used in infrastructure fields such as sewage discharge and water supply, and are important components of urban underground pipe networks. To ensure their long-term reliable operation, before they are put into actual use or delivered from the factory, key strength indicators such as the external pressure bearing capacity and internal pressure bearing capacity of concrete pipes are usually tested to verify their structural safety and applicability.

[0003] In existing technologies, when conducting internal and external pressure strength tests on concrete pipes, the pipes are generally pressurized by filling them with water and maintaining the pressure for a specified time to test their ability to resist the action of internal fluids and ensure that they do not leak or crack under service conditions. At the same time, the external pressure bearing capacity of the concrete pipes is tested by the plate method external pressure test. This involves using two hard parallel plates to apply loads to the pipe body simultaneously in the vertical direction to detect the overall structural response and bearing performance of the pipe when subjected to uniformly distributed external pressure, ensuring that it does not crack or break under service conditions, thereby comprehensively verifying its mechanical reliability in the actual buried environment.

[0004] However, traditional methods for internal and external pressure testing of concrete pipelines have the following problems: 1. In existing technologies, internal and external pressure tests need to be completed on different equipment, requiring repeated transfer of the concrete pipeline during the testing process. This not only reduces testing efficiency but may also cause potential damage to the pipe body during handling. Furthermore, when using the plate method for external pressure testing, only two plates can be used to apply concentrated loads to the pipeline, which cannot realistically simulate the complex mechanical state of the pipeline being uniformly pressurized at multiple points by backfill soil in the actual buried environment. Therefore, it is difficult to fully reflect the comprehensive structural performance of the pipeline under real working conditions. 2. In existing technologies, because the internal and external pressure testing processes of concrete pipelines are separated, it is difficult to achieve synchronous or continuous loading using the same equipment. It is impossible to achieve the synchronous effect of internal pressure loading and uniform external pressure at multiple points. This results in significant differences between the test conditions and the complex mechanical environment in actual working conditions where the pipeline is simultaneously subjected to internal fluid pressure and uniform constraint by the surrounding backfill soil. Consequently, the test results cannot fully reflect the structural response and potential failure modes of the pipeline under real composite loads, and may mask hidden damage and performance abnormalities that exist in production or use, thereby weakening the effective assessment and control capabilities for the long-term operational risks of the pipeline. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a concrete product strength testing device, comprising a test platform symmetrically arranged on the left and right sides, wherein an internal pressure mechanism and an external pressure mechanism are commonly arranged on the test platform, and an equalizing mechanism is arranged on the external pressure mechanism.

[0006] The internal pressure mechanism includes a transverse centering section that is set on two test platforms and moves left and right to connect with the concrete pipe. The transverse centering section is provided with a sealing and pressurizing section that seals the pipe end and pressurizes the pipe by filling it with water, and an internal support section that limits the pipe.

[0007] The external pressure mechanism includes a support mounting part shared by two test benches. The support mounting part is provided with a limit and centering part for supporting and adjusting the pipeline and an external pressure detection part for the pipeline external pressure using the flat plate method.

[0008] The pressure equalization mechanism includes a movable adjustment part that is mounted on the external pressure detection part and can be adjusted back and forth. The movable adjustment part is provided with a pressure equalization part that evenly fits the outside of the pipe and applies pressure at multiple points. The movable adjustment part and the pressure equalization part are jointly provided with a reinforcement support part that supports and reinforces the pressure equalization part.

[0009] Preferably, the transverse alignment includes multiple guide rods uniformly fixed between the two test benches. A hydraulic cylinder is fixedly installed on the opposite side of each of the two test benches. A movable frame that is slidably connected to all the guide rods and moves left and right is fixedly installed at the telescopic end of the hydraulic cylinder. A support roller is rotatably installed on the upper side of the movable frame via a support. A mounting plate is symmetrically fixed at the lower end of the movable frame. A movable wheel is symmetrically rotatably installed on the side of the mounting plate away from the corresponding movable frame.

[0010] Preferably, the sealing and pressurizing part includes a docking ring 1 fixedly disposed on the left side of the right movable frame, a sealing ring 1 fixedly disposed on the left side of the docking ring 1, a docking ring 2 fixedly disposed on the right side of the left movable frame, and a sealing ring 2 fixedly disposed on the right side of the docking ring 2, wherein the outer diameter of the docking ring 2 and the sealing ring 2 is larger than the outer diameter of the docking ring 1 and the sealing ring 1, respectively, and a water inlet is provided on the left movable frame that is open from left to right and located inside the docking ring 2.

[0011] Preferably, the limiting inner support includes a mounting sleeve fixedly disposed on the left side of the right movable frame and located inside the docking ring. A cylinder is fixedly disposed inside the mounting sleeve. The telescopic end of the cylinder slides left and right through the left end of the mounting sleeve. Multiple inner support plates are evenly disposed circumferentially on the telescopic end of the cylinder and the outer side of the mounting sleeve. A transmission rod is hinged between the left end of the inner support plate and the telescopic end of the cylinder. A transmission rod is hinged between the right section of the inner support plate and the outer side of the mounting sleeve. Two transmission rods are distributed left and right.

[0012] Preferably, the support mounting part includes a base plate disposed between two movable frames, a support platform is symmetrically fixedly disposed on the upper side of the base plate, an mounting platform is fixedly disposed on the upper side of the two support platforms, and a fixed platform located above the support roller is fixedly disposed on the upper side of the two test platforms.

[0013] Preferably, the limiting center includes a hydraulic cylinder two fixedly installed on the lower side of the mounting platform. A lifting plate that moves up and down is fixedly installed on the telescopic end of the hydraulic cylinder two. The lifting plate has circular through slots that run vertically through the left and right sides symmetrically. Multiple guide rods two that are slidably connected to the mounting platform are evenly fixedly installed on the lower side of the lifting plate. An L-shaped limiting platform is fixedly installed symmetrically on the upper side of the lifting plate.

[0014] Preferably, the external pressure detection unit includes two hydraulic cylinders three symmetrically fixed on the upper side of the fixed platform. The telescopic ends of the two hydraulic cylinders three are jointly fixed with an upper pressure plate that moves up and down. Multiple guide rods three that are slidably connected to the fixed platform are uniformly fixed on the upper side of the upper pressure plate. Two hydraulic cylinders four symmetrically fixed on the lower side of the mounting platform are connected with a lower pressure plate that moves up and down and is located above the lifting plate. Multiple guide rods four that are slidably connected to the mounting platform are uniformly fixed on the lower side of the lower pressure plate. Rectangular through slots that are symmetrically opened on the lower pressure plate and pass through the corresponding L-shaped limiting platform are provided for sliding up and down.

[0015] Preferably, the movable adjustment part includes two sets of guide rails that are symmetrically fixed on opposite sides of the upper and lower pressure plates. Each set consists of left and right symmetrical guide rails. A sliding table that moves back and forth is slidably arranged on each set of guide rails. A second cylinder is symmetrically fixed on both the upper and lower pressure plates. The extension and retraction ends of the second cylinder are fixedly connected to the corresponding sliding table.

[0016] Preferably, the pressure equalization part includes a rotating seat that is symmetrically fixed on the side of the sliding table away from the corresponding cylinder two. A rotating shaft is fixedly fixed between the two rotating seats. A pressure equalization plate is rotatably mounted on the rotating shaft one. A support seat is symmetrically fixed on the side of the sliding table near the corresponding cylinder two. The support seat is located on the upper side of the corresponding guide rail. A hydraulic cylinder five with its telescopic end hinged to the corresponding pressure equalization plate is rotatably mounted on the support seat.

[0017] Preferably, the reinforcing support includes a limiting seat symmetrically fixed on the upper side of the corresponding sliding platform. The limiting seat has a straight groove that runs through the left and right and extends forward and backward. A rotating shaft 2 that runs through the left and right is rotatably arranged in the middle of the pressure equalizing plate. Connecting rods are symmetrically fixed on the rotating shaft 2. The ends of the two connecting rods away from the corresponding rotating shaft 2 are fixedly connected to a connecting shaft. The opposite sides of the two connecting rods are each fixedly connected to a sliding shaft that is coaxial with the corresponding connecting shaft and slidably connected to the corresponding straight groove.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention, through the cooperation of the internal pressure mechanism, the external pressure mechanism and the pressure equalization mechanism, can realize the internal and external pressure testing of concrete pipes on the same equipment as needed, without moving the pipe body during the testing process. This effectively avoids the low testing efficiency and potential pipe damage risk caused by repeated transfer of work positions, significantly improving testing efficiency and operational safety. At the same time, while meeting the internal and external pressure testing requirements stipulated by national standards, it can also be adapted to pipes of different diameters, ensuring the flexibility and practicality of the testing equipment.

[0019] 2. This invention, through the cooperation of an internal pressure mechanism, an external pressure mechanism, and a pressure equalization mechanism, can simulate the complex stress state of a pipeline after it has been buried and subjected to uniform multi-point pressure from the external soil. The pressure at each loading point can be independently adjusted according to actual working conditions. It can also be used in conjunction with pipeline internal pressure detection to achieve collaborative loading tests. This allows for a high degree of replication of the composite stress conditions of a pipeline under both internal fluid pressure and external complex soil constraints during actual operation in the test environment. This greatly improves the accuracy of assessing the structural behavior and potential failure modes of pipelines in real service environments, providing a more reliable technical basis for comprehensively controlling the quality of concrete pipeline products and long-term operational risks. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention.

[0021] Figure 2 This is a side cross-sectional view of the structure of the present invention.

[0022] Figure 3 This is a partial cross-sectional schematic diagram of the internal pressure mechanism.

[0023] Figure 4 This is a side sectional view of the sealing and pressurizing section.

[0024] Figure 5 This is a partial cross-sectional schematic diagram of the external pressure mechanism.

[0025] Figure 6 This is a side view sectional diagram of the external pressure mechanism.

[0026] Figure 7 This is a schematic diagram of the middle section of the limiting device.

[0027] Figure 8 This is a partial structural diagram of the external pressure detection unit.

[0028] Figure 9 This is a schematic diagram of part of the pressure equalization mechanism.

[0029] Figure 10 This is a partial cross-sectional schematic diagram of the structure of the pressure equalization section.

[0030] In the diagram: 1. Test bench; 2. Internal pressure mechanism; 21. Lateral alignment section; 211. Guide rod one; 212. Hydraulic cylinder one; 213. Moving frame; 214. Support roller; 215. Mounting plate; 216. Moving wheel; 22. Sealing and pressurizing section; 221. Connecting ring one; 222. Sealing ring one; 223. Connecting ring two; 224. Sealing ring two; 225. Water inlet; 23. Limiting inner support section; 231. Mounting sleeve; 232. Cylinder one; 233. Inner support plate; 234. Transmission rod one; 235. Transmission rod two; 3. External pressure mechanism; 31. Support mounting section; 311. Base plate; 312. Support platform; 313. Mounting platform; 314. Fixed platform; 32. Limiting alignment section; 321. Hydraulic cylinder two; 32 2. Lifting plate; 323. Circular through groove; 324. Guide rod two; 325. L-shaped limiting platform; 33. External pressure detection unit; 331. Hydraulic cylinder three; 332. Upper pressure plate; 333. Guide rod three; 334. Hydraulic cylinder four; 335. Lower pressure plate; 336. Guide rod four; 337. Rectangular through groove; 4. Pressure equalizing mechanism; 41. Moving adjustment unit; 411. Guide rail; 412. Sliding table; 413. Cylinder two; 42. Fitting pressure equalizing unit; 421. Rotating seat; 422. Rotating shaft one; 423. Pressure equalizing plate; 424. Support seat; 425. Hydraulic cylinder five; 43. Reinforcing support unit; 431. Limiting seat; 432. Straight groove; 433. Rotating shaft two; 434. Connecting rod; 435. Connecting shaft; 436. Sliding shaft. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1 A concrete product strength testing device includes a test platform 1 symmetrically distributed on the left and right sides. An internal pressure mechanism 2 and an external pressure mechanism 3 are jointly arranged on the test platform 1, and a pressure equalization mechanism 4 is arranged on the external pressure mechanism 3.

[0033] Please see Figure 1 and Figure 2 The internal pressure mechanism 2 includes a transverse centering part 21 that is set on two test benches 1 and moves laterally to connect with the concrete pipe. The transverse centering part 21 is provided with a sealing and pressurizing part 22 that seals the end of the concrete pipe and pressurizes the pipe with water, and a limiting internal support part 23 that limits the pipe.

[0034] Please see Figure 1 , Figure 2 and Figure 3 The transverse movement center section 21 includes multiple guide rods 211 uniformly fixed between two test benches 1. A hydraulic cylinder 212 is fixedly installed on the opposite side of each of the two test benches 1. A moving frame 213 is fixedly installed at the telescopic end of the hydraulic cylinder 212 and is slidably connected to all the guide rods 211 and moves left and right. A support roller 214 is rotatably installed on the upper side of the moving frame 213 via a support. A mounting plate 215 is symmetrically fixed at the lower end of the moving frame 213. A moving wheel 216 is symmetrically rotatably installed on the side of the mounting plate 215 away from the corresponding moving frame 213.

[0035] The hydraulic cylinder 212 can drive the corresponding movable frame 213 to move steadily left and right along the guide rod 211. The movable wheel 216 on the movable frame 213 can stably support the movable frame 213 to reduce the resistance of the movable frame 213 movement adjustment and ensure the stability and accuracy of the movable frame 213 movement adjustment.

[0036] Please see Figure 2 , Figure 3 and Figure 4 The sealing and pressurizing part 22 includes a docking ring 221 fixedly disposed on the left side of the right movable frame 213. A sealing ring 222 is fixedly disposed on the left side of the docking ring 221. A docking ring 223 is fixedly disposed on the right side of the left movable frame 213. A sealing ring 224 is fixedly disposed on the right side of the docking ring 223. The outer diameters of the docking ring 223 and the sealing ring 224 are larger than the outer diameters of the docking ring 221 and the sealing ring 222, respectively. A water inlet 225 is provided on the left movable frame 213, which is open from left to right and located inside the docking ring 223.

[0037] When conducting an internal pressure test on a concrete pipe, the pipe is first stabilized and limited by the external pressure mechanism 3, and the pipe is adjusted up and down to be coaxial with the first docking ring 221 and the second docking ring 223. Then, the hydraulic cylinder 212 drives the moving frame 213 to move left and right until the sealing ring 222 on the first docking ring 221 is stably pressed and sealed with the inlet of the pipe with the smaller diameter, and the sealing ring 224 on the second docking ring 223 is stably pressed and sealed with the socket of the pipe with the larger diameter, thus completing the sealing connection of the two ends of the pipe. At this time, water can be injected into the pipe through the water inlet 225 to pressurize it, and the internal pressure of the pipe is monitored in real time by the pressure sensor (neither of which is shown in the figure) integrated in the existing water filling equipment until the internal pressure of the pipe reaches the standard set value and is maintained within a specified time. At the same time, it is observed whether the pipe leaks or bursts. If the pipe does not leak or burst, it meets the internal pressure test standard.

[0038] Please see Figure 2 , Figure 3 and Figure 4The limiting inner support 23 includes a mounting sleeve 231 fixedly installed on the left side of the right movable frame 213 and located inside the docking ring 221. A cylinder 232 is fixedly installed inside the mounting sleeve 231. The telescopic end of the cylinder 232 slides through the left end of the mounting sleeve 231. Multiple inner support plates 233 are evenly arranged circumferentially on the telescopic end of the cylinder 232 and the outer side of the mounting sleeve 231. A transmission rod 234 is hinged between the left end of the inner support plate 233 and the telescopic end of the cylinder 232. A transmission rod 235 distributed on the left and right sides is hinged between the right section of the inner support plate 233 and the outer side of the mounting sleeve 231.

[0039] Before conducting the flat plate method external pressure test on the concrete pipe using the external pressure mechanism 3, the moving frame 213 drives the sealing ring 1 222 and sealing ring 224 to press the two ends of the pipe tightly. The mounting sleeve 231 then moves synchronously into the pipe spigot end. Next, the telescopic end of the cylinder 1 232 moves to the left. The telescopic end of the cylinder 1 232 then drives the corresponding inner support plate 233 to move away from the mounting sleeve 231 via the transmission rod 1 234. The transmission rod 235 then adjusts synchronously and provides stable support and reinforcement to the right section of the corresponding inner support plate 233 until the inner support plate 233 is stably attached to the inner surface of the pipe, thereby stably limiting the pipe position. This ensures that the pipe will not shift left or right when the external pressure mechanism 3 conducts the flat plate method external pressure test on the concrete pipe, thus ensuring the stability and accuracy of the external pressure test.

[0040] Please see Figure 1 and Figure 2 The external pressure mechanism 3 includes a support mounting part 31 that is shared on two test benches 1. The support mounting part 31 is provided with a limiting and centering part 32 for supporting and adjusting the pipeline and an external pressure detection part 33 for performing external pressure testing on the pipeline using the flat plate method.

[0041] Please see Figure 1 , Figure 2 and Figure 5 The support mounting part 31 includes a base plate 311 disposed between two movable frames 213. Support platforms 312 are symmetrically fixed on the upper side of the base plate 311. Mounting platform 313 is fixedly disposed on the upper side of the two support platforms 312. Fixing platform 314 located above support roller 214 is fixedly disposed on the upper side of the two test platforms 1.

[0042] Please see Figure 5 , Figure 6 and Figure 7The limiting part 32 includes a hydraulic cylinder 321 fixedly installed on the lower side of the mounting platform 313. A lifting plate 322 that moves up and down is fixedly installed on the telescopic end of the hydraulic cylinder 321. A circular through groove 323 that runs vertically through the left and right sides is symmetrically opened on the lifting plate 322. A plurality of guide rods 324 that slide and connect with the mounting platform 313 are evenly fixedly installed on the lower side of the lifting plate 322. An L-shaped limiting platform 325 is symmetrically fixedly installed on the upper side of the lifting plate 322.

[0043] Please see Figure 5 , Figure 6 and Figure 8 The external pressure detection unit 33 includes hydraulic cylinders 331 that are symmetrically fixed on the upper side of the fixed platform 314. The telescopic ends of the two hydraulic cylinders 331 are jointly fixed with an upper pressure plate 332 that moves up and down. Multiple guide rods 333 that are slidably connected to the fixed platform 314 are uniformly fixed on the upper side of the upper pressure plate 332. Hydraulic cylinders 334 that slide through the corresponding circular through slots 323 are symmetrically fixed on the lower side of the mounting platform 313. The telescopic ends of the two hydraulic cylinders 334 are jointly fixed with a lower pressure plate 335 that moves up and down and is located above the lifting plate 322. Multiple guide rods 336 that are slidably connected to the mounting platform 313 are uniformly fixed on the lower side of the lower pressure plate 335. Rectangular through slots 337 that are symmetrically opened on the lower pressure plate 335 and pass through the corresponding L-shaped limiting platform 325.

[0044] When it is necessary to limit and support the concrete pipe, the lifting plate 322 is first moved upward by the hydraulic cylinder 321 until the lifting plate 322 is in contact with the lower surface of the lower pressure plate 335 and the L-shaped limiting platform 325 is fully extended from the corresponding rectangular through groove 337. At this time, the concrete pipe to be tested can be placed between the two L-shaped limiting platforms 325, so that the concrete pipe can be stably limited and supported by the two L-shaped limiting platforms 325.

[0045] When the concrete pipe with the limit is to be moved up and down, the L-shaped limit platform 325 and the lower pressure plate 335 are moved up and down by hydraulic cylinder 2 321 and hydraulic cylinder 4 334 respectively. The concrete pipe, which is stably limited by the L-shaped limit platform 325, moves up and down synchronously until the pipe is adjusted to be coaxial with the connecting ring 1 221 and connecting ring 2 223. Thus, internal and external pressure tests can be performed on pipes with different diameters and axial positions.

[0046] When performing a flat plate external pressure test on a concrete pipe, cylinder 232 first drives the inner support plate 233 to stabilize and lock the pipe. Then, hydraulic cylinder 331 drives the upper pressure plate 332 to move downward and press it against the upper side of the pipe. Hydraulic cylinder 334 drives the lower pressure plate 335 to move upward and press it against the lower side of the pipe. At the same time, hydraulic cylinder 321 drives the L-shaped limiting platform 325 to move downward a small distance until it no longer supports the pipe. At this time, the upper pressure plate 332 and the lower pressure plate 335 continuously apply load to the pipe synchronously. The pressure sensor (not shown in the figure) integrated in the upper pressure plate 332 and the lower pressure plate 335 monitors the applied load in real time until the applied load reaches the standard set value. The pipe is continuously observed for cracking or breakage. If the pipe does not crack or break, it meets the flat plate external pressure test standard.

[0047] The above-described operation method enables on-demand internal and external pressure testing of concrete pipes on the same equipment without moving the pipe during the testing process. This effectively avoids the low testing efficiency and potential pipe damage risks caused by repeated work station transfers, significantly improving testing efficiency and operational safety. In addition, while meeting the internal and external pressure testing requirements specified in the standards, it can also be adapted to pipes of different diameters, ensuring the flexibility and practicality of the testing equipment.

[0048] Please see Figure 1 and Figure 9 The pressure equalization mechanism 4 includes a movable adjustment part 41 that is installed on the external pressure detection part 33 and can be moved back and forth. The movable adjustment part 41 is provided with a bonding pressure equalization part 42 that evenly adheres to the outside of the pipe and applies pressure at multiple points. The movable adjustment part 41 and the bonding pressure equalization part 42 are jointly provided with a reinforcement support part 43 that stably supports and reinforces the bonding pressure equalization part 42.

[0049] Please see Figure 1 , Figure 9 and Figure 10 The movable adjustment unit 41 includes two sets of guide rails 411 that are symmetrically fixed on opposite sides of the upper pressure plate 332 and the lower pressure plate 335. Each set consists of left and right symmetrical guide rails 411. A sliding table 412 that moves back and forth is slidably arranged on each set of guide rails 411. A second cylinder 413 is symmetrically fixed on the upper pressure plate 332 and the lower pressure plate 335. The extension end of the second cylinder 413 is fixedly connected to the corresponding sliding table 412.

[0050] Please see Figure 1 , Figure 9 and Figure 10The pressure equalization part 42 includes a rotating seat 421 symmetrically fixed on the side of the sliding table 412 away from the corresponding cylinder 2 413. A rotating shaft 422 is fixedly fixed between the two rotating seats 421. A pressure equalization plate 423 is rotatably mounted on the rotating shaft 422. A support seat 424 is symmetrically fixed on the side of the sliding table 412 near the corresponding cylinder 2 413. The support seat 424 is located on the upper side of the corresponding guide rail 411. A hydraulic cylinder 5 425 with its telescopic end hinged to the corresponding pressure equalization plate 423 is rotatably mounted on the support seat 424.

[0051] When the pressure equalizing plate 423 is to be pressed against the desired position on the pipeline, the cylinder 413 drives the corresponding sliding table 412 and the pressure equalizing plate 423 to move back and forth along the guide rail 411 for adjustment. The hydraulic cylinder 425 drives the corresponding pressure equalizing plate 423 to rotate around the rotating shaft 422 towards the pipeline until the side of the pressure equalizing plate 423 away from the corresponding hydraulic cylinder 425 contacts and presses against the pipeline. At the same time, the pressure equalizing plate 423 can be moved back and forth and the rotation angle can be adjusted simultaneously to ensure that the pressure equalizing plate 423 can be stably pressed against the desired position on the pipeline. The pressure equalizing plate 423 can also be stably adapted to pipelines of different diameters. The support of the corresponding support seat 424 by the guide rail 411 ensures the stable support of the hydraulic cylinder 425 for the pressure equalizing plate 423 and the stable pressing of the pressure equalizing plate 423 against the pipeline.

[0052] Please see Figure 9 and Figure 10 The reinforcing support part 43 includes a limiting seat 431 symmetrically fixed on the upper side of the corresponding sliding table 412. The limiting seat 431 has a straight groove 432 that runs through the left and right and extends forward and backward. The middle of the pressure equalizing plate 423 is rotatably provided with a rotating shaft 433 that runs through the left and right. The rotating shaft 433 is symmetrically fixed on the left and right. The ends of the two connecting rods 434 away from the corresponding rotating shaft 433 are fixedly provided with a connecting shaft 435. The opposite sides of the two connecting rods 434 are both fixedly provided with a sliding shaft 436 that is coaxial with the corresponding connecting shaft 435 and slidably connected to the corresponding straight groove 432.

[0053] When the rotation angle of the equalizing plate 423 is adjusted, the equalizing plate 423 drives the corresponding rotating shaft 433 to rotate synchronously. The rotating shaft 433 then drives the connecting shaft 435 and the sliding shaft 436 to adjust synchronously through the corresponding connecting rod 434. The sliding shaft 436 then moves back and forth synchronously along the corresponding straight groove 432. Thus, the rotating shaft 433, connecting rod 434, connecting shaft 435 and sliding shaft 436 provide reinforced support for the equalizing plate 423 to adjust its rotation angle, so as to prevent the equalizing plate 423 from deforming during the loading process and ensure the stability of the equalizing plate 423 during the working process.

[0054] When applying pressure evenly to multiple points on the outside of the pipeline, the upper pressure plate 332 and the lower pressure plate 335 are used to apply external pressure to the pipeline using the flat plate method. Then, the equalizing plate 423 is adjusted to apply the same or different loads to the required positions on the outside of the pipeline simultaneously. Thus, the upper pressure plate 332, the lower pressure plate 335 and each equalizing plate 423 work together to achieve even pressure on multiple points on the outside of the pipeline. The loading pressure can be adjusted independently as needed. At the same time, the pressure sensor (not shown in the figure) integrated in the upper pressure plate 332, the lower pressure plate 335 and each equalizing plate 423 monitors the applied load in real time until the corresponding applied load reaches the required size. The pipeline is continuously observed for cracking or breakage, thus simulating the complex stress state of the pipeline being evenly pressured by the external soil after it is buried.

[0055] When applying pressure to multiple points on the outside of the pipeline, the internal pressure mechanism 2 can simultaneously pressurize the inside of the pipeline with water to conduct an internal pressure test, thereby simulating the combined stress conditions of the pipeline under the combined pressure of internal fluid pressure and external complex soil constraints during actual operation.

[0056] The above-described operation method can simulate the complex stress state of a pipeline under uniform multi-point pressure from the external soil after installation. The pressure at each loading point can be independently adjusted according to actual working conditions. It can also be used in conjunction with pipeline internal pressure testing to achieve coordinated loading tests. This allows for a high degree of replication of the composite stress conditions of a pipeline under both internal fluid pressure and external complex soil constraints during actual operation in the test environment. This greatly improves the accuracy of assessing the structural behavior and potential failure modes of pipelines in real service environments, providing a more reliable technical basis for comprehensively controlling the quality of concrete pipeline products and long-term operational risks.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0059] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0060] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A concrete product strength testing device, comprising symmetrically arranged testing platforms, characterized in that: The test bench is equipped with an internal pressure mechanism and an external pressure mechanism, and the external pressure mechanism is equipped with a pressure equalization mechanism. The internal pressure mechanism includes a transverse centering part that is set on two test platforms and moves left and right to connect with the concrete pipe. The transverse centering part is provided with a sealing and pressurizing part that seals the pipe end and pressurizes the pipe by filling it with water, and an internal support part that limits the pipe. The external pressure mechanism includes a support mounting part shared by two test benches. The support mounting part is provided with a limit and centering part for supporting and adjusting the pipeline and an external pressure detection part for the external pressure of the pipeline using the flat plate method. The pressure equalization mechanism includes a movable adjustment part that is installed on the external pressure detection part and can be adjusted back and forth. The movable adjustment part is provided with a pressure equalization part that evenly fits the outside of the pipe and applies pressure at multiple points. The movable adjustment part and the pressure equalization part are jointly provided with a reinforcement support part that supports and reinforces the pressure equalization part. The concrete pipe is subjected to internal and external pressure tests by internal and external pressure mechanisms respectively. The pressure equalization mechanism, in conjunction with the internal and external pressure mechanisms, applies internal fluid pressure and externally uniformly distributed multi-point pressure to the pipe simultaneously to restore the combined pressure experienced by the pipe in actual operation.

2. The concrete product strength testing device according to claim 1, characterized in that: The transverse movement includes multiple guide rods evenly fixed between two test platforms. A hydraulic cylinder is fixedly installed on the opposite side of each of the two test platforms. A movable frame that is slidably connected to all the guide rods and moves left and right is fixedly installed at the telescopic end of the hydraulic cylinder. A support roller is rotatably installed on the upper side of the movable frame via a support. A mounting plate is symmetrically fixed at the lower end of the movable frame. A movable wheel is symmetrically rotatably installed on the side of the mounting plate away from the corresponding movable frame.

3. The concrete product strength testing device according to claim 2, characterized in that: The sealing and pressurizing part includes a docking ring 1 fixedly installed on the left side of the right movable frame. A sealing ring 1 is fixedly installed on the left side of the docking ring 1. A docking ring 2 is fixedly installed on the right side of the left movable frame. A sealing ring 2 is fixedly installed on the right side of the docking ring 2. The outer diameters of the docking ring 2 and the sealing ring 2 are larger than the outer diameters of the docking ring 1 and the sealing ring 1, respectively. A water inlet is provided on the left movable frame that runs through the left and right sides and is located inside the docking ring 2.

4. The concrete product strength testing device according to claim 3, characterized in that: The limiting inner support includes a mounting sleeve fixedly installed on the left side of the right movable frame and located inside the docking ring. A cylinder is fixedly installed inside the mounting sleeve. The telescopic end of the cylinder slides left and right through the left end of the mounting sleeve. Multiple inner support plates are evenly arranged circumferentially on the telescopic end of the cylinder and the outer side of the mounting sleeve. A transmission rod is hinged between the left end of the inner support plate and the telescopic end of the cylinder. A transmission rod is hinged between the right section of the inner support plate and the outer side of the mounting sleeve. Two transmission rods are distributed left and right.

5. The concrete product strength testing device according to claim 2, characterized in that: The support mounting part includes a base plate disposed between two movable frames. Support platforms are symmetrically fixedly disposed on the upper side of the base plate, and mounting platforms are fixedly disposed on the upper side of the two support platforms. A fixed platform located above the support roller is fixedly disposed on the upper side of the two test platforms.

6. The concrete product strength testing device according to claim 5, characterized in that: The limiting center includes a hydraulic cylinder two fixedly installed on the lower side of the mounting platform. A lifting plate that moves up and down is fixedly installed on the telescopic end of the hydraulic cylinder two. A circular through groove that runs vertically through the left and right sides is symmetrically opened on the lifting plate. A plurality of guide rods two that are slidably connected to the mounting platform are evenly fixedly installed on the lower side of the lifting plate. An L-shaped limiting platform is symmetrically fixedly installed on the upper side of the lifting plate.

7. A concrete product strength testing device according to claim 6, characterized in that: The external pressure detection unit includes two hydraulic cylinders three that are symmetrically fixed on the upper side of the fixed platform. The telescopic ends of the two hydraulic cylinders three are fixedly mounted with an upper pressure plate that moves up and down. Multiple guide rods three that are slidably connected to the fixed platform are evenly fixed on the upper side of the upper pressure plate. The lower side of the mounting platform has two hydraulic cylinders four that are symmetrically fixed on the left and right, with their telescopic ends sliding through the corresponding circular slots. The telescopic ends of the two hydraulic cylinders four are fixedly mounted with a lower pressure plate that moves up and down and is located above the lifting plate. Multiple guide rods four that are slidably connected to the mounting platform are evenly fixed on the lower side of the lower pressure plate. The lower pressure plate has rectangular slots that are symmetrically opened front and back and pass through the corresponding L-shaped limiting platform.

8. The concrete product strength testing device according to claim 7, characterized in that: The movable adjustment unit includes two sets of guide rails that are symmetrically fixed on opposite sides of the upper and lower pressure plates. Each set consists of left and right symmetrical guide rails. A sliding table that moves back and forth is slidably arranged on each set of guide rails. Cylinders are symmetrically fixed on the upper and lower pressure plates. The extension and retraction ends of cylinders are fixedly connected to the corresponding sliding tables.

9. A concrete product strength testing device according to claim 8, characterized in that: The pressure equalization part includes rotating seats that are symmetrically fixed on the side of the sliding table away from the corresponding cylinder two. A rotating shaft one is fixedly fixed between the two rotating seats. A pressure equalization plate is rotatably mounted on the rotating shaft one. A support seat is symmetrically fixed on the side of the sliding table near the corresponding cylinder two. The support seat is located on the upper side of the corresponding guide rail. A hydraulic cylinder five with its telescopic end hinged to the corresponding pressure equalization plate is rotatably mounted on the support seat.

10. A concrete product strength testing device according to claim 9, characterized in that: The reinforced support includes a limiting seat that is symmetrically fixed on the upper side of the corresponding sliding platform. The limiting seat has a straight groove that runs through the left and right and extends forward and backward. The middle of the pressure equalizing plate is rotatably provided with a rotating shaft that runs through the left and right. The rotating shaft is symmetrically fixed on the rotating shaft. The ends of the two connecting rods away from the corresponding rotating shaft are fixed together with a connecting shaft. The opposite sides of the two connecting rods are both fixed with a sliding shaft that is coaxial with the corresponding connecting shaft and slidably connected to the corresponding straight groove.

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