Vibration water tight test equipment for construction waste recycled fine aggregate and method thereof

Abstract

The present application relates to the technical field of compression test, and discloses a vibration water tightness test equipment and method for building waste recycled fine aggregate, which comprises a base and a hydraulic control system. Through the linkage structure of the inserted sleeve, the pressure arm and the limiting seat, the pressure rod is gradually moved to the rotation center of the rocker arm during the constant angular velocity deflection of the rocker arm, the length of the pressure arm is continuously shortened, the continuous decrease of the displacement and the moving speed is realized under the same rotation angle, the gradual pressure effect of the rapid settlement in the early stage and the slow pressure stabilization in the later stage is formed, and the pressure pressure can be simultaneously and adaptively increased according to the change rule of the continuously increased resistance and stiffness of the test piece during the compression process. The nonlinear deformation rule of the recycled fine aggregate test piece, that is, the large initial pore, the fast settlement, the small resistance in the early stage, and the particle embedding and compacting, the sudden increase of the hardness and the resistance in the later stage, is adapted, and the detection authenticity and accuracy of the core parameters such as the ultimate compressive strength, the steady creep and the settlement deformation are greatly improved.

Description

Technical Field

[0001] This invention belongs to the field of compressive strength testing technology, specifically, it relates to a vibration watertightness testing device and method for recycled fine aggregates from construction waste. Background Technology

[0002] Recycled fine aggregate from construction waste is a recycled building material produced by crushing, screening, and shaping construction waste. It is widely used in civil engineering projects such as roadbed backfilling, site leveling, and subbase filling. This type of aggregate differs from natural aggregates, exhibiting characteristics such as a softer texture, higher porosity, unstable particle size distribution, and lack of cementation. Its overall strength relies entirely on the interlocking and bonding between particles after molding. Backfill specimens molded using a vibration-watertight process exhibit significant nonlinear and staged mechanical characteristics during compressive deformation: initially, the specimens have well-developed pores and loose particles, resulting in low overall stiffness and low compressive resistance, leading to rapid settlement under external force; as pressure continues, the internal pores are gradually compacted and closed, the aggregate particles are tightly interlocked, and the overall density and structural stiffness of the specimen continuously increase. Macroscopically, this manifests as increased overall hardness, a sharp rise in compressive resistance, and a significant slowdown in the settlement deformation rate. Therefore, for the pressure resistance and stability testing of this type of special specimen, it is necessary to match the pressure application method with adaptive speed and dynamic pressure output according to resistance in order to conform to the actual compaction evolution law of the specimen and ensure the authenticity and reliability of the test data.

[0003] The existing equipment maintains a relatively constant hydraulic output pressure throughout the test, adapting to the test process only by changing the downward displacement rate. However, in the early stages of the test when the specimen is loose and has low stiffness, the constant output pressure combined with the adjustable speed can still complete the conventional compression operation. But in the middle and later stages of the test, when the specimen particles are densely interlocked, the overall hardness increases significantly, and the pressure resistance increases substantially, the constant output force of the equipment cannot keep up with the increase in specimen stiffness. This easily leads to problems such as insufficient pressure application, delayed downward pressure, and attenuation of the stabilizing pressure. As a result, the specimen cannot be fully compacted in the later stages, and the detection of key parameters such as steady-state creep characteristics and ultimate compressive strength is distorted.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows: A vibration watertightness testing device for recycled fine aggregates from construction waste includes a base and a hydraulic control system. A bearing platform is provided on the base, and a pressure sensor is installed between the base and the bearing platform. A top rod is installed at the output end of the hydraulic control system, and a pressure plate is installed at the bottom of the top rod, with the pressure plate vertically corresponding to the bearing platform. The top rod is rotatably mounted with a pair of rocker arms. A sleeve is mounted at the rotation center of the rocker arms. A drive assembly is mounted on the top rod, and the drive assembly is used to drive the sleeve and rocker arms to deflect synchronously. A pressure rod is slidably mounted on the rocker arm, and the bottom of the pressure rod is slidably connected to the pressure plate. The deflection of the rocker arm causes the pressure rod to move downward, and the pressure rod squeezes the pressure plate to move downward synchronously to perform compressive strength testing on the vibratory watertight recycled fine aggregate backfill specimen. The sleeve is rotatably mounted with a pressure arm, and a horizontally sliding limit seat is rotatably mounted at the end of the pressure arm. The limit seat is movably connected to the pressure rod. The rotation of the sleeve drives the pressure rod to move towards the center of rotation of the rocker arm, so that the downward speed of the pressure rod decreases synchronously when the rocker arm rotates at the same angle. This is suitable for the stress characteristics of the vibrating watertight recycled fine aggregate backfill specimen, which has rapid settlement in the early stage and increasing compaction resistance in the later stage.

[0006] In a preferred embodiment of the present invention, a support rod is installed at each corner of the base. The support rod has a thread at its bottom and an adjustment plate is screwed onto the thread. An anti-slip pad is installed at the bottom of the adjustment plate, and the cross-sectional area of ​​the adjustment plate is trapezoidal.

[0007] In a preferred embodiment of the present invention, a hydraulic control system is installed on the base, which is used to control the pressure plate to move gradually to the surface of the vibrating watertight recycled fine aggregate backfill specimen. A baffle is also installed on the outer wall of the pressure plate to prevent debris from splashing. A controller is also installed on the base, which is connected to the drive assembly, pressure sensor and hydraulic control system respectively.

[0008] In a preferred embodiment of the present invention, a notch is provided on the top rod, and a drive assembly is installed inside the notch. The drive assembly includes a drive motor, and the housing of the drive motor is installed on the top of the notch. A lead screw shaft is installed at the output end of the drive motor, and a connecting seat is rotatably installed at the end of the lead screw shaft. The end of the connecting seat is installed at the bottom of the notch. A lead screw sleeve is engaged with the outer wall of the lead screw shaft, and a pair of insert rods are rotatably installed on the outer wall of the lead screw sleeve. The ends of the insert rods are inserted into the corresponding insert sleeves.

[0009] In a preferred embodiment of the present invention, a sliding plate is installed on the outer wall of the lead screw sleeve, and a sliding rod is movably installed through the sliding plate. The sliding rod is in a vertical state, and sliding seats are installed at both ends of the sliding rod. The ends of the sliding seats are installed on the side wall of the notch.

[0010] In a preferred embodiment of the present invention, a positioning seat is installed on the outer side wall of the top rod, and a positioning shaft is rotatably mounted on the positioning seat. The positioning shaft is connected to the rotation centers of the rocker arm and the socket respectively.

[0011] In a preferred embodiment of the present invention, a strip groove is provided on the rocker arm, a light rod is slidably installed inside the strip groove, a connecting frame is installed on the light rod, and the connecting frame is U-shaped. A pressure rod is installed at the bottom of the connecting frame, a slider is installed at the bottom of the pressure rod, a guide rod is installed through the slider, and guide seats are installed at both ends of the guide rod. The guide seats are installed above the pressure plate.

[0012] In a preferred embodiment of the present invention, the pressure rod is in a vertical state, and a limiting rod is movably inserted into the end of the limiting seat. The limiting rod is in a horizontal state, and the end of the limiting rod is installed on the outer wall of the top rod.

[0013] In a preferred embodiment of the present invention, a guide cavity is provided at the bottom of the top rod, an auxiliary rod is installed on the pressure plate and inserted into the guide cavity, and a baffle is installed at the end of the auxiliary rod and slides on the side wall of the guide cavity. An assembly spring is sleeved on the auxiliary rod located inside the guide cavity. One end of the assembly spring is engaged with the side wall of the guide cavity, and the other end of the assembly spring is engaged with the baffle. The assembly spring is used to limit the initial position of the pressure plate during the assembly process.

[0014] A test method for a vibration watertightness testing device for recycled fine aggregates from construction waste, comprising the following steps: Step 1: Before the test, use the adjustment plates on each support rod at the bottom of the base to fine-tune the overall level and installation height of the equipment. In conjunction with the anti-slip pads at the bottom of the adjustment plates, the equipment can be stably positioned to reduce shaking and displacement during the test. Step 2: Place the pre-prepared construction waste recycled fine aggregate backfill specimen, which has been formed by vibration watertight process, stably in the center of the bearing platform above the base, ensuring that the specimen is placed flat; Step 3: Start the hydraulic control system through the controller to drive the top rod to move vertically and slowly downward, so that the bottom pressure plate moves smoothly close to the surface of the specimen until the pressure plate is completely in contact with the upper surface of the specimen, forming a rigid clamping structure between the pressure plate and the bearing platform for the specimen. Step 4: Start the drive motor inside the top rod to drive the lead screw shaft to rotate. Through the lead screw meshing transmission, the lead screw sleeve is driven to slide precisely in the vertical direction. Under the limiting action of the sliding plate and the sliding rod, the lead screw sleeve is ensured to only make vertical linear movements. The lead screw sleeve pulls the insert sleeve and the rocker arm to rotate synchronously around the positioning axis. The rocker arm drives the U-shaped connecting frame and the bottom pressure rod to move vertically downward, squeezing the pressure plate to apply pressure to the specimen. At the same time, the rotation of the insert sleeve drives the pressure arm to pull the limiting seat to slide horizontally, pulling the pressure rod closer to the rotation center of the rocker arm, shortening the force arm of the pressure rod, and realizing the gradual pressure application of the pressure plate with rapid downward pressure in the early stage and slow and stable pressure in the later stage. Step 5: Data Acquisition and Result Analysis. Throughout the pressure testing process, the pressure sensor continuously collects the pressure value, pressure settlement deformation, and pressure fluctuation data during the stabilization phase of the specimen in real time. All test data is transmitted to the controller for storage, processing, and analysis in real time. After the test, the ultimate compressive bearing capacity, pressure settlement deformation characteristics, pressure stabilization creep performance, and compaction stability of the specimen are determined by the pressure-settlement change law throughout the entire process. Finally, the particle interlocking strength, overall structural stability, and deformation resistance of the recycled fine aggregate backfill specimen after vibration watertight molding are accurately evaluated, thus completing the test and inspection work.

[0015] Compared with the prior art, the present invention has the following advantages: This invention utilizes a linked structure of a sleeve, a pressure arm, and a limiting seat. During the constant angular velocity deflection of the rocker arm, the pressure rod gradually moves closer to the center of rotation of the rocker arm, continuously shortening the length of the pressure arm. Under the same rotation angle, this achieves a continuous decrease in the downward displacement and downward speed, forming a gradual pressure effect of rapid settlement in the early stage and slow and stable pressure in the later stage. Simultaneously, based on the changing law of the continuous increase in resistance and stiffness of the specimen during the compression process, the pressure can be synchronously and adaptively increased. This adapts to the nonlinear deformation law of recycled fine aggregate specimens, which initially have large pores, fast settlement, and low resistance, and later have dense particle interlocking, hardness, and resistance that increase sharply. This effectively reduces the problems of insufficient pressure power, pressure decay, and downward pressure lag in the later stage, ensuring that the dense structure of the specimen in the middle and later stages can be fully compacted. This significantly improves the authenticity and accuracy of the detection of core parameters such as ultimate compressive strength, steady-state creep, and settlement deformation.

[0016] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] In the attached diagram: Figure 1 A three-dimensional diagram of a vibration watertightness testing device for recycled fine aggregates from construction waste; Figure 2 A front view of a vibration watertightness testing device for recycled fine aggregates from construction waste; Figure 3 A partial vibratory watertightness testing device for recycled fine aggregates from construction waste. Figure 1 ; Figure 4 A partial vibratory watertightness testing device for recycled fine aggregates from construction waste. Figure 2 ; Figure 5 Notch structure for a vibration watertightness testing device for recycled fine aggregates from construction waste Figure 1 ; Figure 6 Notch structure for a vibration watertightness testing device for recycled fine aggregates from construction waste Figure 2 ; Figure 7 A vibration watertightness testing device for recycled fine aggregates from construction waste Figure 6 Enlarged view of point A in the middle; Figure 8 This is a cross-sectional view of the bottom of the top rod of a vibration watertightness testing device for recycled fine aggregates from construction waste.

[0018] In the diagram: 1. Base; 2. Support rod; 3. Adjusting plate; 4. Controller; 5. Bearing platform; 6. Pressure sensor; 7. Hydraulic control system; 8. Top rod; 9. Pressure plate; 10. Cover plate; 11. Notch; 12. Drive motor; 13. Lead screw shaft; 14. Connecting seat; 15. Lead screw sleeve; 16. Slide plate; 17. Slide rod; 18. Slide seat; 19. Rocker arm; 20. Positioning shaft; 21. Positioning seat; 22. Insert sleeve; 23. Insert rod; 24. Strip groove; 25. Smooth rod; 26. Connecting frame; 27. Pressure rod; 28. Slider; 29. ​​Guide rod; 30. Guide seat; 31. Limit seat; 32. Limit rod; 33. Pressure arm; 34. Guide cavity; 35. Auxiliary rod; 36. Baffle; 37. Assembly spring. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention. Example 1:

[0020] like Figures 1 to 8 As shown, a vibration watertightness test device for recycled fine aggregates from construction waste includes a base 1 and a hydraulic control system 7. A bearing platform 5 is provided on the base 1, and a pressure sensor 6 is installed between the base 1 and the bearing platform 5. A top rod 8 is installed at the output end of the hydraulic control system 7, and a pressure plate 9 is installed at the bottom of the top rod 8, and the pressure plate 9 is vertically corresponding to the bearing platform 5. A pair of rocker arms 19 are rotatably mounted on the top rod 8. A sleeve 22 is mounted on the center of rotation of the rocker arms 19. A drive assembly is mounted on the top rod 8, and the drive assembly is used to drive the sleeve 22 and the rocker arms 19 to deflect synchronously. A pressure rod 27 is slidably mounted on the rocker arms 19, and the bottom of the pressure rod 27 is slidably connected to the pressure plate 9. The deflection of the rocker arms 19 causes the pressure rod 27 to move downward, and the pressure rod 27 presses the pressure plate 9 to move downward synchronously to perform compressive strength testing on the vibrating watertight recycled fine aggregate backfill specimen. The side wall of the insert 22 is rotatably mounted with a pressure arm 33, and the end of the pressure arm 33 is rotatably mounted with a horizontally sliding limit seat 31. The limit seat 31 is movably inserted into the pressure rod 27. The rotation of the insert 22 drives the pressure rod 27 to move towards the rotation center of the rocker arm 19, so that the downward speed of the pressure rod 27 decreases synchronously when the rocker arm 19 rotates at the same angle. This is suitable for the stress characteristics of the vibrating watertight recycled fine aggregate backfill specimen, which has rapid settlement in the early stage and increasing compaction resistance in the later stage.

[0021] like Figures 1 to 8 As shown in the specific embodiment, support rods 2 are installed at the bottom corners of the base 1. The bottom of the support rods 2 is threaded, and an adjusting plate 3 is screwed onto the thread. An anti-slip pad is installed on the bottom of the adjusting plate 3, and the cross-sectional area of ​​the adjusting plate 3 is trapezoidal. This section, through the cooperative structure of the support rods 2, the threaded adjusting plate 3, and the anti-slip pad, allows for precise fine-tuning of the overall level and installation height of the equipment. The trapezoidal structure of the adjusting plate 3, combined with the anti-slip pad, significantly improves the grounding stability of the equipment, effectively avoiding interference from equipment shaking and displacement during the test on the detection accuracy.

[0022] like Figures 1 to 8 As shown, a hydraulic control system 7 is further installed on the base 1. The hydraulic control system 7 is used to control the pressure plate 9 to move gradually to the surface of the vibrating watertight recycled fine aggregate backfill specimen. A shield 10 is also installed on the outer wall of the pressure plate 9 to prevent debris from splashing. A controller 4 is also installed on the base 1. The controller 4 is interconnected with the drive assembly, pressure sensor 6 and hydraulic control system 7. The hydraulic control system 7 achieves precise feed control of the pressure plate 9, and the controller 4 enables coordinated and automated control of various electrical components. At the same time, the shield 10 is used to shield and protect against debris, which not only improves the automation level of the equipment, but also avoids test errors caused by fine material loss of the specimen and environmental dirt, ensuring a clean test environment and standardized testing process. Example 2:

[0023] The difference between the above embodiments and this embodiment is that: Figures 1 to 8 As shown, a notch 11 is provided on the top rod 8, and a drive assembly is installed inside the notch 11. The drive assembly includes a drive motor 12, and the housing of the drive motor 12 is installed on the top of the notch 11. A lead screw shaft 13 is installed at the output end of the drive motor 12, and a connecting seat 14 is rotatably installed at the end of the lead screw shaft 13. The end of the connecting seat 14 is installed at the bottom of the notch 11. A lead screw sleeve 15 is meshed on the outer wall of the lead screw shaft 13, and a pair of insert rods 23 are rotatably installed on the outer wall of the lead screw sleeve 15. The ends of the insert rods 23 are inserted into the corresponding insert sleeves 22. This section achieves a smooth conversion and output of motor power through the drive structure of the drive motor 12, lead screw shaft 13, connecting seat 14, lead screw sleeve 15, and insert rods 23 built into the notch 11. The lead screw meshing transmission has high precision and uniform power transmission, which can ensure that the insert sleeves 22 and the rocker arm 19 rotate synchronously and smoothly, reducing the problems of transmission jamming and uneven power.

[0024] like Figures 1 to 8 As shown in the specific embodiment, a sliding plate 16 is installed on the outer wall of the lead screw sleeve 15. A sliding rod 17 is movably installed through the sliding plate 16. The sliding rod 17 is in a vertical state, and sliding seats 18 are installed at both ends of the sliding rod 17. The ends of the sliding seats 18 are installed on the side wall of the notch 11. Through the limiting and cooperating structure of the sliding plate 16, the sliding rod 17 and the sliding seats 18, the rotational freedom of the lead screw sleeve 15 is effectively restricted, ensuring that the lead screw sleeve 15 only slides vertically in a straight line, further improving the transmission accuracy and stability, and ensuring that the gradual pressure application process is uniform, stable and without deviation. Example 3:

[0025] The difference between the above embodiments and this embodiment is that: Figures 1 to 8 As shown, a positioning seat 21 is installed on the outer wall of the push rod 8, and a positioning shaft 20 is rotatably mounted on the positioning seat 21. The positioning shaft 20 is connected to the rotation centers of the rocker arm 19 and the insert sleeve 22 respectively. Through the positioning structure of the positioning seat 21 and the positioning shaft 20, a precise and stable rotation fulcrum is provided for the rocker arm 19 and the insert sleeve 22, ensuring that the two rotate synchronously and coaxially, preventing rotational deviation and asynchrony, and ensuring the accuracy of lever arm adjustment and gradual pressure application.

[0026] like Figures 1 to 8 As shown, in a specific embodiment, the rocker arm 19 has a strip groove 24, and a smooth rod 25 is slidably installed inside the strip groove 24. A connecting frame 26 is installed on the smooth rod 25, and the connecting frame 26 is U-shaped. A pressure rod 27 is installed at the bottom of the connecting frame 26, and a slider 28 is installed at the bottom of the pressure rod 27. A guide rod 29 is installed through the slider 28, and guide seats 30 are installed at both ends of the guide rod 29. The guide seats 30 are installed above the pressure plate 9. The above structure ensures that the pressure rod 27 remains vertical during the pressing process, effectively offsetting the horizontal offset stress, avoiding uneven local stress on the specimen, and greatly improving the stability and uniformity of the pressing.

[0027] like Figures 1 to 8 As shown, the pressure rod 27 is in a vertical position, and a limit rod 32 is movably inserted into the end of the limit seat 31. The limit rod 32 is in a horizontal position, and its end is installed on the outer wall of the top rod 8. The horizontally positioned limit rod 32 provides precise limiting and guidance for the limit seat 31, ensuring that the limit seat 31 only slides horizontally and linearly. This ensures that the lever arm adjustment of the pressure rod 27 is precise and controllable, and guarantees a stable and reliable gradual speed regulation effect.

[0028] like Figures 1 to 8As shown, further, a guide cavity 34 is provided at the bottom of the top rod 8, and an auxiliary rod 35 is installed on the pressure plate 9. The auxiliary rod 35 is inserted into the guide cavity 34, and a baffle 36 is installed at the end of the auxiliary rod 35. The baffle 36 slides on the side wall of the guide cavity 34. An assembly spring 37 is sleeved on the auxiliary rod 35 located inside the guide cavity 34. One end of the assembly spring 37 is engaged with the side wall of the guide cavity 34, and the other end is engaged with the baffle 36. The assembly spring 37 is used to limit the initial position of the pressure plate 9 during the assembly process. Through the cooperative structure of the guide cavity 34, the auxiliary rod 35, the baffle 36, and the assembly spring 37, the initial assembly position of the pressure plate 9 is accurately limited and the downward pressure process is smoothly guided, effectively avoiding the problems of initial offset and downward tilt of the pressure plate 9, and improving the assembly accuracy and test stability of the equipment.

[0029] This invention also discloses a test method for a vibration watertightness test device for recycled fine aggregates from construction waste, the steps of which are as follows: Step 1: Before the test, use the adjustment plates 3 on each support rod 2 at the bottom of the base 1 to fine-tune the overall level and installation height of the equipment. The anti-slip pads at the bottom of the adjustment plates 3 help to stabilize the equipment and reduce the shaking and displacement of the equipment during the test. Step 2: Place the pre-prepared construction waste recycled fine aggregate backfill specimen, which has been formed by vibration watertight process, stably on the center of the bearing platform 5 above the base 1, ensuring that the specimen is placed flat; Step 3: Start the hydraulic control system 7 through the controller 4, drive the top rod 8 to move vertically and slowly downward, and drive the bottom pressure plate 9 to move smoothly close to the surface of the specimen until the pressure plate 9 is completely in contact with the upper surface of the specimen, forming a rigid clamping structure between the pressure plate 9 and the support platform 5 for the specimen. Step 4: Start the drive motor 12 inside the top rod 8 to drive the lead screw shaft 13 to rotate. Through the lead screw meshing transmission, the lead screw sleeve 15 is driven to slide precisely in the vertical direction. Under the limiting action of the slide plate 16 and the slide rod 17, the lead screw sleeve 15 is ensured to only make vertical linear movements. The lead screw sleeve 15 pulls the insert sleeve 22 and the rocker arm 19 to rotate synchronously around the positioning shaft 20 through the insert rod 23. The rocker arm 19 drives the U-shaped connecting frame 26 and the bottom pressure rod 27 to move vertically downward, squeezing the pressure plate 9 to apply pressure to the specimen. At the same time, the insert sleeve 22 rotates and drives the pressure arm 33 to pull the limiting seat 31 to slide horizontally, pulling the pressure rod 27 closer to the rotation center of the rocker arm 19, shortening the force arm of the pressure rod 27, and realizing the gradual pressure application of the pressure plate 9 with rapid downward pressure in the early stage and slow and stable pressure in the later stage. Step 5: Data Acquisition and Result Analysis. Throughout the entire pressure testing process, pressure sensor 6 continuously collects the pressure value, pressure settlement deformation, and pressure fluctuation data during the stabilization phase of the specimen in real time, and transmits all the test data to controller 4 for storage, processing, and analysis. After the test, the ultimate compressive bearing capacity, pressure settlement deformation characteristics, pressure creep performance, and compaction stability of the specimen are determined by the pressure-settlement change law throughout the entire process. Finally, the particle interlocking strength, overall structural stability, and deformation resistance of the recycled fine aggregate backfill specimen after vibration watertight molding are accurately evaluated, and the test operation is completed.

[0030] The implementation principle of the vibration watertightness testing equipment for recycled fine aggregate from construction waste of the present invention is as follows: When using this equipment, the level and height of the whole machine are first finely adjusted by the threaded adjustment plate 3 on the bottom support rod 2 of the base 1. The anti-slip pad at the bottom of the adjustment plate 3 ensures the overall stability of the equipment during the test and avoids the equipment shaking from affecting the detection accuracy. The prepared vibration watertightness recycled fine aggregate backfill specimen is placed stably on the surface of the bearing platform 5 above the base 1. The specimen is then pressed down by the pressure plate 9, forming an upper and lower clamping fit with the bearing platform 5. The pressure sensor 6 installed between the base 1 and the bearing platform 5 monitors the test pressure data in real time and accurately. At the same time, the controller 4 on the base 1 completes the coordinated control of the electrical components of the whole machine. After the test is started, the hydraulic control system 7 first drives the push rod 8 to move vertically downward, which in turn drives the bottom pressure plate 9 to slowly approach the surface of the specimen. During the downward movement of the push rod 8, the assembly spring 37, which is sleeved inside the guide cavity 34 and connected to the outside of the auxiliary rod 35, maintains the initial support state. With the sliding cooperation between the baffle 36 and the guide cavity 34, the stability of the pressure plate 9 during movement is ensured, and the initial assembly position of the pressure plate 9 is effectively limited to prevent it from shifting or tilting.

[0031] After the pressure plate 9 is attached to the surface of the specimen, the drive motor 12 inside the notch 11 of the top rod 8 starts, driving the lead screw shaft 13 to rotate stably under the support of the connecting seat 14. Through the lead screw meshing transmission, the lead screw sleeve 15 is driven to slide smoothly in the vertical direction. During the movement of the lead screw sleeve 15, the outer slide plate 16 is driven to slide vertically along the slide rod 17. The cooperation between the slide rod 17 and the slide seats 18 at both ends can effectively limit the rotational freedom of the lead screw sleeve 15, ensuring that it only makes vertical linear motion and avoiding transmission jamming. As the lead screw sleeve 15 slides, the insert sleeve 22 is pulled synchronously by the insert rods 23 on both sides, so that the insert sleeve 22 and the rocker arm 19 rotate synchronously around the positioning shaft 20 on the positioning seat 21. During the rotation, the rocker arm 19 drives the U-shaped connecting frame 26 and the vertically set pressure rod 27 at the bottom to move down synchronously through the sliding cooperation of the strip groove 24 and the smooth rod 25. The slider 28 at the bottom of the pressure rod 27 slides horizontally along the guide rod 29 above the pressure plate 9. With the limiting and guiding effect of the guide seat 30, the verticality and stability of the pressure rod 27 during the pressing process are ensured, and the uneven force on the specimen is avoided due to the downward displacement.

[0032] While the rocker arm 19 and the insert sleeve 22 are deflecting, the pressure arm 33 on the side wall of the insert sleeve 22 rotates synchronously, pulling the end limit seat 31 to slide horizontally. This causes the limit seat 31 to drive the plugged pressure rod 27 to gradually approach the rotation center of the rocker arm 19, changing the lever arm distance of the pressure rod 27. As a result, the lever arm length of the pressure rod 27 relative to the rotation center of the rocker arm 19 continuously shortens. Under the premise that the rocker arm 19 maintains the same rotation angle and constant angular velocity deflection, the vertical linear displacement stroke of the pressure rod 27 continuously decreases, corresponding to a gradual decrease in the vertical downward movement speed. This creates a gradual downward pressure effect of rapid pressure in the early stage and slow, stable pressure in the later stage, accurately adapting to the special mechanical characteristics of the vibrating watertight recycled fine aggregate backfill specimen, which has large porosity and fast settling speed in the early stage, and gradually increasing compressive resistance in the later stage. During the compressive strength test under the steady pressure of the pressure plate 9, the shield 10 on the outside of the pressure plate 9 can effectively prevent the splashing of fine material debris generated by the crushing of the specimen under pressure, keeping the test environment clean. During the testing process, the pressure plate 9 and the bearing platform 5 are rigidly clamped together, and the pressure sensor 6 collects the pressure value, the pressure settlement deformation, and the pressure change data during the stabilization process of the specimen in real time. The data is then transmitted to the controller 4 for storage and analysis. Finally, the ultimate compressive bearing capacity, pressure settlement deformation characteristics, pressure creep performance, and pressure compaction stability of the specimen are determined. By observing the pressure and settlement change patterns throughout the process, the overall structural strength, interlocking compaction stability, and deformation resistance of the recycled fine aggregate backfill specimen after vibration watertight molding are accurately determined. This effectively adapts to the structural characteristics of soft recycled aggregates that are non-aggregate and formed by particle interlocking.

[0033] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vibration watertightness testing device for recycled fine aggregates from construction waste, comprising a base (1) and a hydraulic control system (7), characterized in that: A support platform (5) is provided on the base (1), and a pressure sensor (6) is installed between the base (1) and the support platform (5). A push rod (8) is installed at the output end of the hydraulic control system (7), and a pressure plate (9) is installed at the bottom of the push rod (8), and the pressure plate (9) is vertically aligned with the support platform (5). The top rod (8) is rotatably mounted with a pair of rocker arms (19). A sleeve (22) is mounted at the rotation center of the rocker arm (19). A drive assembly is mounted on the top rod (8), and the drive assembly is used to drive the sleeve (22) and the rocker arm (19) to deflect synchronously. A pressure rod (27) is slidably mounted on the rocker arm (19), and the bottom of the pressure rod (27) is slidably connected to the pressure plate (9). The deflection of the rocker arm (19) causes the pressure rod (27) to move down, and the pressure rod (27) squeezes the pressure plate (9) to move down synchronously to perform compressive strength testing on the vibrating watertight recycled fine aggregate backfill specimen. The sleeve (22) is rotatably mounted with a pressure arm (33), and the end of the pressure arm (33) is rotatably mounted with a horizontally sliding limit seat (31). The limit seat (31) is movably inserted into the pressure rod (27). The rotation of the sleeve (22) drives the pressure rod (27) to move towards the rotation center of the rocker arm (19), so that the downward speed of the pressure rod (27) decreases synchronously when the rocker arm (19) rotates at the same angle, which is suitable for the stress characteristics of the vibrating watertight recycled fine aggregate backfill specimen, which has fast early settlement and increasing compaction resistance in the later stage.

2. The vibration watertightness testing equipment for recycled fine aggregates from construction waste according to claim 1, characterized in that, Support rods (2) are installed at the bottom corners of the base (1). The bottom of the support rods (2) is threaded, and an adjustment plate (3) is screwed onto the thread. The bottom of the adjustment plate (3) is equipped with an anti-slip pad, and the cross-sectional area of ​​the adjustment plate (3) is trapezoidal.

3. The vibration watertightness testing equipment for recycled fine aggregates from construction waste according to claim 1, characterized in that, A hydraulic control system (7) is installed on the base (1). The hydraulic control system (7) is used to control the pressure plate (9) to move gradually to the surface of the vibrating watertight recycled fine aggregate backfill specimen. A shield (10) is also installed on the outer wall of the pressure plate (9). The shield (10) is used to prevent debris from splashing. A controller (4) is also installed on the base (1). The controller (4) is connected to the drive assembly, pressure sensor (6) and hydraulic control system (7) respectively.

4. The vibration watertightness testing equipment for recycled fine aggregates from construction waste according to claim 1, characterized in that, The top rod (8) has a notch (11) and a drive assembly is installed inside the notch (11). The drive assembly includes a drive motor (12) and the housing of the drive motor (12) is installed on the top of the notch (11). A lead screw shaft (13) is installed at the output end of the drive motor (12), and a connecting seat (14) is rotatably installed at the end of the lead screw shaft (13). The end of the connecting seat (14) is installed at the bottom of the notch (11). A lead screw sleeve (15) is meshed on the outer wall of the lead screw shaft (13). A pair of insert rods (23) are rotatably installed on the outer wall of the lead screw sleeve (15). The ends of the insert rods (23) are inserted into the corresponding insert sleeves (22).

5. The vibration watertightness testing equipment for recycled fine aggregates from construction waste according to claim 4, characterized in that, A slide plate (16) is installed on the outer wall of the lead screw sleeve (15). A slide rod (17) is movably installed on the slide plate (16). The slide rod (17) is in a vertical state. Slide seats (18) are installed at both ends of the slide rod (17). The end of the slide seat (18) is installed on the side wall of the notch (11).

6. The vibration watertightness testing equipment for recycled fine aggregates from construction waste according to claim 1, characterized in that, A positioning seat (21) is installed on the outer wall of the top rod (8), and a positioning shaft (20) is rotatably installed on the positioning seat (21). The positioning shaft (20) is connected to the rotation center of the rocker arm (19) and the sleeve (22) respectively.

7. The vibration watertightness testing equipment for recycled fine aggregates from construction waste according to claim 1, characterized in that, The rocker arm (19) has a strip groove (24) with a light rod (25) slidably installed inside the strip groove (24). A connecting frame (26) is installed on the light rod (25) and the connecting frame (26) is U-shaped. A pressure rod (27) is installed at the bottom of the connecting frame (26). A slider (28) is installed at the bottom of the pressure rod (27). A guide rod (29) is installed through the slider (28). Guide seats (30) are installed at both ends of the guide rod (29) and the guide seats (30) are installed above the pressure plate (9).

8. The vibration watertightness testing equipment for recycled fine aggregates from construction waste according to claim 1, characterized in that, The pressure rod (27) is in a vertical state, and the end of the limiting seat (31) is movably connected to a limiting rod (32). The limiting rod (32) is in a horizontal state, and the end of the limiting rod (32) is installed on the outer wall of the top rod (8).

9. The vibration watertightness testing equipment for recycled fine aggregates from construction waste according to claim 1, characterized in that, The bottom of the top rod (8) is provided with a guide cavity (34). An auxiliary rod (35) is installed on the pressure plate (9) and the auxiliary rod (35) is inserted into the guide cavity (34). A baffle (36) is installed at the end of the auxiliary rod (35) and the baffle (36) slides on the side wall of the guide cavity (34). An assembly spring (37) is sleeved on the auxiliary rod (35) located inside the guide cavity (34). One end of the assembly spring (37) is engaged with the side wall of the guide cavity (34), and the other end of the assembly spring (37) is engaged with the baffle (36). The assembly spring (37) is used to limit the initial position of the pressure plate (9) during the assembly process.

10. A test method for a vibration watertightness testing device for recycled fine aggregates from construction waste, characterized in that, The vibration watertightness testing equipment for recycled fine aggregates from construction waste, as described in any one of claims 1 to 9, comprises the following steps: Step 1: Before the test, adjust the overall level and installation height of the equipment by adjusting the adjustment plate (3) on each support rod (2) at the bottom of the base (1). The anti-slip pad at the bottom of the adjustment plate (3) is used to achieve stable positioning of the equipment and reduce the shaking and displacement of the equipment during the test. Step 2: Place the pre-prepared construction waste recycled fine aggregate backfill specimen, which has been formed by vibration watertight process, stably in the center of the bearing platform (5) above the base (1) to ensure that the specimen is placed flat; Step 3: Start the hydraulic control system (7) through the controller (4), drive the top rod (8) to move vertically and slowly downward, and drive the bottom pressure plate (9) to approach the surface of the specimen smoothly until the pressure plate (9) is completely attached to the upper surface of the specimen, forming a rigid clamping structure between the pressure plate (9) and the bearing platform (5) for the specimen. Step 4: Start the drive motor (12) inside the top rod (8) to drive the lead screw shaft (13) to rotate. Through the lead screw meshing transmission, the lead screw sleeve (15) is driven to slide precisely in the vertical direction. Under the limiting action of the slide plate (16) and the slide rod (17), the lead screw sleeve (15) is ensured to only make vertical linear movements. The lead screw sleeve (15) pulls the insert sleeve (22) and the rocker arm (19) with the positioning shaft (20) as the center through the insert rod (23). Synchronous deflection, the rocker arm (19) drives the U-shaped connecting frame (26) and the bottom pressure rod (27) to move vertically downward, squeezing the pressure plate (9) to apply pressure to the specimen; at the same time, the insert (22) rotates to drive the pressure arm (33) to pull the limiting seat (31) to slide horizontally, pulling the pressure rod (27) closer to the rotation center of the rocker arm (19), shortening the force arm of the pressure rod (27), realizing the gradual pressure application of the pressure plate (9) with rapid downward pressure in the early stage and slow and stable pressure in the later stage; Step 5: Data acquisition and result analysis. During the entire pressure test, the pressure sensor (6) continuously collects the pressure value, pressure settlement deformation, and pressure fluctuation data of the specimen in real time, and transmits all the test data to the controller (4) for storage, sorting and analysis in real time. After the test, the ultimate compressive bearing capacity, pressure settlement deformation characteristics, pressure creep performance and compaction stability of the specimen are determined by the pressure-settlement change law throughout the process. Finally, the particle interlocking strength, overall structural stability and deformation resistance of the recycled fine aggregate backfill specimen after vibration watertight molding are accurately evaluated, and the test operation is completed.

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