Concrete member punching and grinding cyclic test device

Abstract

The invention discloses a concrete member punching and grinding cyclic test device which comprises a central rotating shaft, an annular water tank, a first bearing arm and a first stirring arm, the central rotating shaft is rotatably and vertically arranged in the center of the annular water tank, and the top of the central rotating shaft upwards extends out of the tank top surface of the annular water tank; the first bearing arm comprises a first end part and a second end part which are opposite to each other, the first end part is fixedly connected to the top of the central rotating shaft, the second end part outwards extends to the position over a notch of the annular water tank in the radial direction of the central rotating shaft, and a bearing mechanism is arranged on the second end part; the bearing mechanism extends downwards into the annular water tank and is used for bearing the concrete member, a stirring mechanism is arranged on the first stirring arm, and the stirring mechanism extends downwards into the annular water tank and is used for stirring a water body in the annular water tank; and by adopting a loading mode of water immobility and component rotation, the energy consumption of the device is greatly reduced, and the device is energy-saving and environment-friendly.

Description

Technical Field

[0001] The invention belongs to the field of hydraulic test equipment, and in particular relates to a concrete component impact and abrasion cycle test device. Background Art

[0002] In the field of hydraulic concrete engineering, it is necessary to test the wear resistance of concrete, that is, it is necessary to test the relative resistance of the concrete surface to wear by high-speed flowing media in order to evaluate the relative anti-abrasion performance of the concrete surface.

[0003] The current "Test Code for Hydraulic Concrete" (SL / T 352-2020) specifies the concrete abrasion resistance test methods including the ring method and the underwater steel ball method. The corresponding abrasion devices are the concrete abrasion resistance test machine and the concrete scour resistance test machine. The test objects and results are only for the material level and cannot reflect the changes in the bearing capacity of concrete components. However, the bearing capacity of concrete components after abrasion is a key indicator for structural design and protection. On the other hand, the media for concrete abrasion damage caused by floods include water flow, sand and boulders, while the two test methods specified in the specification simulate water flow and sand as the media, without considering the influence of boulder or gravel abrasion. In summary, the existing abrasion test methods cannot test the abrasion resistance of components. The concrete abrasion environment simulated by the test methods is somewhat different from the actual one. The accuracy of the test results needs to be verified, and the test results are difficult to apply to engineering abrasion resistance design.

[0004] The traditional water tank flushing test device adopts the "dynamic water + fixed components" method. The device needs to use a high-power water pump to meet the rapid flow of large volumes of sand-containing water. It has high energy consumption and is not conducive to energy conservation and environmental protection.

[0005] The present invention aims to develop a concrete abrasion resistance test device at the component level. The test parameters can be adjusted according to the flood velocity, sand content, and gravel grading at the actual bridge site, so as to simulate the cyclic abrasion of bridge piers / pile foundation components under the joint action of various media such as water flow, sand and boulders. After the abrasion test, the test pieces are analyzed for changes in the bearing capacity of the concrete components through quasi-static tests, etc., to finally achieve quantitative testing of the abrasion resistance of concrete components. Summary of the invention

[0006] In view of the above problems, the present invention provides a concrete component impact and grinding cycle test device that overcomes the above problems or at least partially solves the above problems. The technical solution is as follows:

[0007] A concrete component impact and grinding cycle test device comprises a central rotating shaft, an annular water tank, a first bearing arm and a first stirring arm, wherein the central rotating shaft is rotatably arranged vertically at the center of the annular water tank, the top of the central rotating shaft extends upwardly from the groove top surface of the annular water tank, the first bearing arm comprises opposite first and second ends, the first end is fixedly connected to the top of the central rotating shaft, the second end extends radially outwardly from the central rotating shaft to just above the notch of the annular water tank, a bearing mechanism is arranged on the second end, the bearing mechanism extends downward into the annular water tank for carrying the concrete component, a rotation angle is formed between the first stirring arm and the first bearing arm, the first stirring arm comprises opposite third and fourth ends, the third end is fixedly connected to the top of the central rotating shaft, the fourth end extends radially outwardly from the central rotating shaft to just above the notch of the annular water tank, a stirring mechanism is arranged on the fourth end, the stirring mechanism extends downward into the annular water tank for stirring the water in the annular water tank.

[0008] Compared with the prior art, the concrete component impact and abrasion cycle test device of the present invention has the following advantages:

[0009] By setting the central rotating shaft, annular water tank, first bearing arm and first stirring arm, the first bearing arm and the first stirring arm are driven by the central rotating shaft to rotate along the circumferential direction of the annular water tank, so as to drive the concrete component on the bearing mechanism to collide with the water in the annular water tank to carry out the anti-impact and abrasion test. The "water does not move + component rotates" loading method greatly reduces the energy consumption of the device, and is energy-saving and environmentally friendly; at the same time, the first stirring arm and the stirring mechanism can further stir the water in the annular water tank, so that the test process is closer to the actual environment, and the authenticity of the test results is greatly improved, forming a set of concrete anti-impact and abrasion test equipment that can be used for material performance research, equipment performance verification, and structural design analysis.

[0010] The above-mentioned concrete component impact and abrasion cycle test device has the advantages of simple structure and easy implementation, is suitable for installation and use in existing concrete component impact and abrasion tests, and has low cost of use and can improve benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall top view structure of the present invention;

[0012] Figure 2 It is a schematic diagram of the cross-sectional structure of the first bearing arm carrying the concrete component in the annular water tank;

[0013] Figure 3 It is a schematic diagram of the cross-sectional structure of the first carrying arm being arranged in the annular water tank;

[0014] Figure 4 It is a schematic diagram of the cross-sectional structure of a first stirring arm arranged in an annular water tank;

[0015] Description of Reference Numerals

[0016] 100 center shaft;

[0017] 200 annular water tank;

[0018] 310 first bearing arm, 320 second bearing arm;

[0019] 410 a first stirring arm, 420 a second stirring arm;

[0020] 510 support arm, 520 support seat, 530 base rail, 540 convex rail, 550 dust-proof brush;

[0021] 610 stirring rod, 620 stirring fan. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] When implementing: Figure 1-4 As shown, a concrete component impact and grinding cycle test device includes a central rotating shaft 100, an annular water tank 200, a first bearing arm 310 and a first stirring arm 410. The central rotating shaft 100 is rotatably arranged vertically at the center of the annular water tank 200, and the top of the central rotating shaft 100 extends upward from the groove top surface of the annular water tank 200. The first bearing arm 310 includes a first end and a second end opposite to each other. The first end is fixedly connected to the top of the central rotating shaft 100, and the second end extends radially outward from the central rotating shaft 100 to just above the notch of the annular water tank 200. The second end is provided with A bearing mechanism, the bearing mechanism extends downward into the annular water trough 200 and is used to bear the concrete member. A rotation angle is defined between the first stirring arm 410 and the first bearing arm 310. The first stirring arm 410 includes a third end and a fourth end opposite to each other. The third end is fixedly connected to the top of the central rotating shaft 100, and the fourth end extends radially outwardly along the central rotating shaft 100 to just above the notch of the annular water trough 200. A stirring mechanism is disposed on the fourth end and the stirring mechanism extends downward into the annular water trough 200 and is used to stir the water in the annular water trough 200.

[0024] Compared with the prior art, the concrete component impact and abrasion cycle test device of the present invention has the following advantages:

[0025] By setting the central rotating shaft 100, the annular water tank 200, the first bearing arm 310 and the first stirring arm 410, the central rotating shaft 100 drives the first bearing arm 310 and the first stirring arm 410 to rotate along the circumferential direction of the annular water tank 200, so as to drive the concrete components on the bearing mechanism to collide with the water in the annular water tank 200 to carry out the anti-impact and abrasion test. The "water does not move + component rotates" loading method greatly reduces the energy consumption of the device, and is energy-saving and environmentally friendly; at the same time, the first stirring arm 410 and the stirring mechanism can further stir the water in the annular water tank 200, so that the test process is closer to the actual environment, and the authenticity of the test results is greatly improved, forming a set of concrete anti-impact and abrasion test equipment that can be used for material performance research, equipment performance verification, and structural design analysis.

[0026] The above-mentioned concrete component impact and abrasion cycle test device has the advantages of simple structure and easy implementation, is suitable for installation and use in existing concrete component impact and abrasion tests, and has low cost of use and can improve benefits.

[0027] During implementation, a motor is disposed at the bottom of the central rotating shaft 100 , and the rotating shaft of the motor is coaxially connected to the central rotating shaft 100 to drive the central rotating shaft 100 to rotate automatically.

[0028] During implementation, an outflow pipe is provided at the bottom of the annular water trough 200 , and an outflow port is provided between the outflow pipe and the annular water trough 200 .

[0029] During implementation, the rotation angle between the first stirring arm 410 and the first carrying arm 310 is ninety degrees.

[0030] In this embodiment, Figure 1-4 As shown, the bearing mechanism includes a support arm 510 and a support seat, the support arm 510 includes a relative connecting end and a bearing end, the connecting end is connected to the second end of the first bearing arm 310, the bearing end extends downward to the bottom of the annular water tank 200, and the support seat 520 is installed on the bearing end for bearing the concrete member.

[0031] In this way, by setting the support arm 510 and the support seat, the concrete component can be hoisted under the first bearing arm 310 to better collide and rub with the water in the annular water tank 200, reduce the rotational resistance during rotational collision, and the bearing structure is relatively simple, easy to implement, and has high reliability.

[0032] In this embodiment, Figure 1-4 As shown, an annular track is arranged on the bottom surface of the annular water tank 200, and the annular track is arranged coaxially with the annular water tank 200. A sliding groove is opened at the bottom of the support seat 520, and the support seat 520 is slidably arranged on the annular track through the sliding groove.

[0033] In this way, by setting up the circular track, the support seat 520 can move along the circular track, thereby enhancing the stability of the support seat 520 during movement, and preventing the centrifugal force generated during rotation from generating a large pulling force on the first supporting arm 310. The rotation is more stable, reducing wear and tear, and enhancing the service life of the first supporting arm 310 and the support seat 520.

[0034] In this embodiment, Figure 1-4 As shown, the annular track includes a base rail 530 and a convex rail 540. The base rail 530 is fixed to the bottom surface of the annular water tank 200, and the convex rail 540 is fixed to the middle of the top surface of the base rail 530 and is coaxially arranged with the base rail 530. The inner contour of the cross section of the sliding groove is the same as the outer contour of the cross section of the annular track.

[0035] In this way, by setting the base rail 530 and the convex rail 540, the base rail 530 can better support the support seat 520 and resist the radial centrifugal force, and the convex rail 540 can reduce the deflection centrifugal force generated by the support seat 520 relative to the base rail 530 due to the different specific gravity during the rotation process, thereby further enhancing the stability and reliability of the support seat 520 during rotation.

[0036] In this embodiment, Figure 1-4 As shown, a sliding gap is provided between the bottom surface of the support seat 520 and the bottom surface of the annular water tank 200 , and a dustproof brush is provided in the sliding gap, and the dustproof brush is fixedly connected to the bottom surface of the support seat 520 .

[0037] In this way, by setting the sliding gap, the friction force generated between the support seat 520 and the bottom surface of the annular water tank 200 when the support seat 520 moves on the annular track is reduced, thereby enhancing the smoothness of movement of the support seat 520 on the annular slide rail.

[0038] In this embodiment, Figure 1-4 As shown, the stirring mechanism includes a plurality of stirring components, which are arranged side by side in sequence along the length direction of the first stirring arm 410 and can stir the water in the annular water tank 200 at the same time.

[0039] In this way, by setting up multiple stirring components, the water at different radial positions of the annular water tank 200 can be stirred more fully, further approaching the actual water mixing degree, and improving the test precision and accuracy.

[0040] In this embodiment, Figure 1-4As shown, the stirring assembly includes a stirring rod 610 and a stirring fan 620. One end of the stirring rod 610 is fixedly connected to the first stirring arm 410, and the other end extends downward to the bottom of the annular water tank 200. There are multiple stirring fans 620, and the multiple stirring fans 620 are arranged in sequence on the stirring rod 610 along the axial direction of the stirring rod 610.

[0041] In this way, by setting the stirring rod 610 and the stirring fan 620, the stirring rod 610 can control the depth of the stirring fan 620 in a diversified manner, and multiple stirring fans 620 can stir water bodies of different depths at the same time, further improving the adequacy of stirring.

[0042] During implementation, the stirring fan 620 includes a connecting shaft and fan blades. The connecting shaft is coaxially fixed to the stirring rod 610. There are two fan blades that are relatively fixedly connected to the two side edges of the connecting shaft.

[0043] In this embodiment, Figure 1-4 As shown, it also includes a second supporting arm 320, which is fixedly connected to the central rotating shaft 100 and arranged opposite to the first supporting arm 310. The second supporting arm 320 is also provided with the supporting mechanism, and the supporting mechanism on the second supporting arm 320 is arranged opposite to the supporting mechanism on the first supporting arm 310.

[0044] In this way, by providing the second carrying arm 320, the second carrying arm 320 can operate together with the first carrying arm 310, so that two concrete components can be tested at the same time, thereby improving the efficiency of the impact and abrasion test.

[0045] In this embodiment, Figure 1-4 As shown, it also includes a second stirring arm 420, which is fixedly connected to the central rotating shaft 100 and is arranged opposite to the first stirring arm 410. The second stirring arm 420 is also provided with the stirring mechanism, and the stirring mechanism on the second stirring arm 420 is arranged opposite to the stirring mechanism on the first supporting arm 310.

[0046] In this way, by providing the second stirring arm 420, the second stirring arm 420 can operate together with the first stirring arm 410, thereby improving the stirring effect on the water body and stirring more fully.

[0047] In this embodiment, Figure 1-4 As shown, the inner and outer side walls of the annular water tank 200 are both made of transparent tempered glass.

[0048] In this way, by setting the inner and outer side walls of the annular water tank 200 as transparent tempered glass, it is convenient to observe the test status.

[0049] Working principle: The test device uses structural movement instead of water flow movement to simulate the abrasion and impact of gravel-containing water flow on the test piece. The gravel and water are evenly mixed through the front stirring mechanism. The bearing mechanism and concrete components move in the gravel-containing water body under the rotation of the central shaft 100 and interact with the gravel. The test is carried out in a circulation system without the need for additional water or sand. The movement speed can be adjusted by the rotation speed of the central shaft 100, and the impact simulation under different water flow speeds can be realized. Simulation tests of two concrete components can be carried out at the same time.

[0050] Test run before the test: Before the test, check that all parts are connected reliably, close the outlet, add water and sand / gravel of the target ratio into the annular water tank 200, turn on the power, close the first-level switch, and the stirring rod 610 drives the fan blades to start rotating and stir the gravel evenly. Close the second-level switch, and the central shaft 100 starts gradually. The initial speed runs at a low speed to ensure that the first bearing arm 310 drives the support seat to rotate at a uniform speed and the gravel is stirred evenly. After normal operation, the speed of the central shaft 100 is gradually increased slowly until it reaches the test speed and stabilizes. Maintain the test speed for 10 minutes, then disconnect the second-level switch, and the central shaft 100 gradually decelerates until it stops. After the central shaft 100 stops rotating and stabilizes, disconnect the first-level switch, and the stirring rod 610 gradually stops stirring.

[0051] Test piece test: Anchor the two concrete components to be tested on the support seat with bolts, and gradually open the first and second level switches, the stirring rod 610 and the central shaft 100 to ensure that the test piece rotates smoothly and reaches the test speed. During the test, monitor the torque of the first bearing arm 310 and the first stirring arm 410, and disconnect the second and first level switches respectively when the set threshold is exceeded. After the test time is reached, turn off all switches and disconnect the power supply. After the rotation stops, remove the anchor bolts and concrete components, open the outlet, drain the water and gravel in the annular water tank 200, and clean the annular water tank 200.

[0052] The present invention can simulate the impact and abrasion of media such as water flow, sand and boulders on bridge pier components. Compared with the existing standard method, the influence of boulders is added, the test conditions are closer to the actual environment, the authenticity of the test results is greatly improved, and a set of concrete anti-impact and abrasion test equipment is formed that can be used for material performance research, equipment performance verification, and structural design analysis.

[0053] The above are only preferred implementations of the present invention. It should be pointed out that a number of modifications and improved technical solutions made by those skilled in the art without departing from the technical solution should also be deemed to fall within the scope of protection required by the claims.

Claims

1. Concrete component impact and grinding cycle test device, characterized in that: The invention comprises a central rotating shaft, an annular water trough, a first bearing arm and a first stirring arm, wherein the central rotating shaft is rotatably arranged vertically at the center of the annular water trough, the top of the central rotating shaft extends upwardly from the groove top surface of the annular water trough, the first bearing arm comprises a first end portion and a second end portion opposite to each other, the first end portion is fixedly connected to the top of the central rotating shaft, the second end portion extends radially outwardly from the central rotating shaft to just above the notch of the annular water trough, a bearing mechanism is arranged on the second end portion, the bearing mechanism extends downwardly into the annular water trough for carrying the concrete component, a rotation angle is formed between the first stirring arm and the first bearing arm, the first stirring arm comprises a third end portion and a fourth end portion opposite to each other, the third end portion is fixedly connected to the top of the central rotating shaft, the fourth end portion extends radially outwardly from the central rotating shaft to just above the notch of the annular water trough, a stirring mechanism is arranged on the fourth end portion, the stirring mechanism extends downwardly into the annular water trough for stirring the water in the annular water trough.

2. The concrete component impact and abrasion cycle test device according to claim 1, characterized in that: The bearing mechanism includes a support arm and a supporting seat, the support arm includes opposite connecting ends and a bearing end, the connecting end is connected to the second end of the first bearing arm, the bearing end extends downward to the bottom of the annular water trough, and the supporting seat is installed on the bearing end for bearing the concrete member.

3. The concrete component impact and abrasion cycle test device according to claim 2, characterized in that: An annular track is arranged on the bottom surface of the annular water tank, and the annular track is arranged coaxially with the annular water tank. A sliding groove is opened at the bottom of the support seat, and the support seat is slidably arranged on the annular track through the sliding groove.

4. The concrete component impact and abrasion cycle test device according to claim 3, characterized in that: The annular track includes a base rail and a convex rail. The base rail is fixed to the bottom surface of the annular water tank. The convex rail is fixed to the middle of the top surface of the base rail and is coaxially arranged with the base rail. The inner contour of the cross section of the sliding groove is the same as the outer contour of the cross section of the annular track.

5. The concrete component impact and abrasion cycle test device according to claim 4, characterized in that: A sliding gap is provided between the bottom surface of the support seat and the bottom surface of the annular water tank, a dustproof brush is provided in the sliding gap, and the dustproof brush is fixedly connected to the bottom surface of the support seat.

6. The concrete component impact and abrasion cycle test device according to claim 4, characterized in that: The stirring mechanism comprises a plurality of stirring components, which are arranged in parallel in sequence along the length direction of the first stirring arm and can stir the water in the annular water tank at the same time.

7. The concrete component impact and abrasion cycle test device according to claim 6, characterized in that: The stirring assembly includes a stirring rod and a stirring fan. One end of the stirring rod is fixedly connected to the first stirring arm, and the other end extends downward to the bottom of the annular water tank. There are multiple stirring fans, and the multiple stirring fans are arranged in sequence on the stirring rod along the axial direction of the stirring rod.

8. The concrete component impact and abrasion cycle test device according to any one of claims 1 to 7, characterized in that: It also includes a second bearing arm, which is fixedly connected to the central rotating shaft and arranged opposite to the first bearing arm. The second bearing arm is also provided with the bearing mechanism, and the bearing mechanism on the second bearing arm is arranged opposite to the bearing mechanism on the first bearing arm.

9. The concrete component impact and abrasion cycle test device according to claim 8, characterized in that: It also includes a second stirring arm, which is fixedly connected to the central rotating shaft and arranged opposite to the first stirring arm. The second stirring arm is also provided with the stirring mechanism, and the stirring mechanism on the second stirring arm is arranged opposite to the stirring mechanism on the first supporting arm.

10. The concrete component impact and abrasion cycle test device according to any one of claims 1 to 7, characterized in that: The inner and outer side walls of the annular water tank are both made of transparent tempered glass.

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