A bridge concrete durability testing device

Abstract

The present invention discloses a bridge concrete durability test device, which belongs to the field of bridge performance technology. The device comprises a test box and a concrete component. The test box is provided with a mounting base, and the concrete component is detachably connected to the mounting base. A plurality of support shafts are distributed in a circular array on the mounting base with the concrete component as the center. Support plates are provided between adjacent support shafts. A force-applying airbag wrapping the concrete component is provided between the support plates and the concrete component. A liquid storage tank for pumping a filling liquid into the force-applying airbag is provided in the test box, and the filling liquid is a salt water mixture. A plurality of pressure relief valves are provided on the inner wall of the force-applying airbag. A detection device is provided on the concrete component. The purpose of the present invention is to simulate an ocean environment and conduct a bridge concrete durability performance test.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge performance, and in particular relates to a bridge concrete durability testing device. Background Art

[0002] Under normal circumstances, concrete has good durability. However, in the marine environment, concrete bridges are not only under load for a long time, but also eroded by external factors such as seawater and temperature. The piers are also oppressed by the pressure of seawater, which has a serious impact on the durability of concrete. Therefore, the durability test of concrete is even more important. Summary of the Invention

[0003] In view of this, the present invention provides a bridge concrete durability testing device, the purpose of which is to conduct a bridge concrete durability performance test in a simulated marine environment.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A bridge concrete durability test device comprises a test box and a concrete component, wherein the test box is provided with a built-in mounting base, and the concrete component is detachably connected to the mounting base; a plurality of support shafts are distributed in a circular array on the mounting base with the concrete component as the center, support plates are provided between adjacent support shafts, and a force-applying airbag wrapping the concrete component is provided between the support plate and the concrete component; a liquid storage tank is provided in the test box for pumping a filling liquid into the force-applying airbag, and the filling liquid is a salt water mixture; a plurality of pressure relief valves are provided on the inner wall of the force-applying airbag; and a detection device is provided on the concrete component.

[0006] In this solution, a salt water mixture of the required concentration is prepared as the filling liquid, and the concrete component is connected to the mounting base. The filling liquid simulating seawater is then pumped into the force-applying airbag through a liquid storage tank. After the force-applying airbag expands, it is supported and restricted by the support plate and wraps the concrete component more evenly, thereby applying pressure to the concrete component. When the pressure inside the force-applying airbag reaches the intensity required for the test, the excess filling liquid is discharged through the pressure relief valve, so that the filling liquid is sprayed onto the concrete component, keeping the pressure of the force-applying airbag maintained at the parameters required for the test.

[0007] The effective effect of this solution: using the force-applying airbag to apply relatively uniform pressure to the concrete components, simulating the impact of seawater pressure on bridge piers, can more accurately test the durability of bridge concrete in the marine environment. In addition, the excess filling fluid is discharged to the surface of the concrete component through the pressure relief valve, while stabilizing the pressure applied by the force-applying airbag on the concrete component. This simulates the corrosiveness of seawater on the bridge concrete, thereby more accurately simulating the impact of the marine environment on the bridge concrete and improving the accuracy of the test.

[0008] Furthermore, the force-applying airbag includes several groups of airbag assemblies, which are stacked in sequence from bottom to top to wrap around the concrete component; the liquid storage tank is provided with several liquid storage cavities corresponding to the number of airbag assemblies, each of which is filled with filling liquid, and the liquid storage cavities are connected to the corresponding airbag assemblies.

[0009] The force-applying airbag is configured as a number of airbag assemblies, and the filling liquid can be pumped into different airbag assemblies through the corresponding liquid storage chamber. The regional height of the pressure on the concrete component can be adjusted to simulate the ocean environment at different depths, thereby improving the test accuracy. In addition, the concentration of the filling liquid in the liquid storage chamber can be adjusted according to the test requirements, so that different parts of the concrete component are exposed to different filling liquid concentrations, thereby simulating different residual seawater concentrations and improving the test accuracy.

[0010] Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion. The swing arm ends up being rotated with the hook portion. The swing arm ends are rotated with the hook portion.

[0011] According to the different sizes of concrete components, the distance between the support shaft and the concrete component is adjusted by sliding the slide, and the area between the support plate and the concrete component is adjusted by coordinating the relative sliding between the fixed plate and the movable plate, thereby controlling the collision degree of the airbag assembly, thereby limiting the pressure applied to the concrete component after the airbag assembly is expanded, and preventing the pressure from being too large or too small, which affects the experimental results; in addition, during the adjustment process of the support shaft, the length of the airbag team is adjusted by stretching the other end of the airbag assembly, so that the airbag assembly can wrap the concrete component more accurately, and cooperate with the position adjustment of the support shaft to be suitable for concrete components of different sizes; and during the adjustment process of the airbag assembly, the connection groove and the limit block are used to prevent the airbag assembly from detaching, and it also plays a guiding role.

[0012] Furthermore, the pressure relief valve includes a tubular valve body, which is fixed to the airbag assembly and communicated with the same. The inner diameter of the end of the valve body facing the concrete component is larger than the inner diameter of the other end. A closing plate is slidably provided in the valve body, and the closing plate is used to close the end of the valve body with a smaller diameter. A connecting spring facing the concrete component is fixed to the closing plate. A connecting sleeve is threadedly connected to the end of the valve body facing the concrete component. An annular groove is provided on the inner wall of the connecting sleeve. A connecting ring is rotatably connected in the annular groove. A support rod is fixed between the connecting ring and the connecting spring.

[0013] In this solution, when the pressure in the airbag assembly is low, the force exerted by the filling liquid on the closing plate cannot overcome the elastic force of the connecting spring, and the closing plate is prohibited; as the pressure inside the airbag assembly increases, the filling liquid squeezes the closing plate toward the larger end of the valve body and continuously squeezes the connecting spring; when the pressure inside the airbag assembly reaches the required level, the filling liquid pushes the closing plate to the end with the larger inner diameter of the valve body, causing a gap to appear between the closing plate and the valve body, allowing excess filling liquid to flow out through the valve body, thereby maintaining the pressure inside the airbag assembly at the required level, thereby improving the accuracy of the airbag assembly in exerting pressure on the concrete component, thereby improving the test accuracy.

[0014] In addition, by rotating the connecting sleeve, the relative position relationship between the connecting sleeve and the valve body is adjusted, and the distance between the closing plate and the end with the larger inner diameter of the valve body is adjusted, that is, the pressure required to be reached inside the airbag assembly when the filling liquid is discharged is adjusted.

[0015] Furthermore, a plurality of depressions are provided on the end surface of the airbag assembly facing the concrete component, and the pressure relief valves are all provided in the corresponding depressions.

[0016] By providing the depression, when the airbag assembly expands and covers the concrete component, the pressure relief valve is prevented from contacting the concrete component, thereby causing damage to the concrete component and affecting the test accuracy.

[0017] Furthermore, a clamping plate is hinged at the edge of each through slot, the clamping plate is locked with the through slot, and a receiving groove for accommodating the guide block is provided on the side wall of the clamping plate.

[0018] Furthermore, the locking structure includes a through hole provided on the slide seat, a plurality of limiting grooves are evenly distributed on the bottom of the slide seat, and a limiting pin is inserted between the through hole and the limiting groove.

[0019] Furthermore, a coaxial cavity is provided on the mounting base, a drainage facility is provided at the bottom of the cavity, a pedestal is provided in the cavity, and the concrete component is detachably connected to the pedestal.

[0020] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0022] Figure 1 Schematic diagram of the structure of an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A magnified schematic diagram of point A in the middle;

[0024] Figure 3 A top view of the mounting base according to an embodiment of the present invention;

[0025] Figure 4 is a longitudinal sectional view of the mounting base in an embodiment of the present invention;

[0026] Figure 5 for Figure 4 Enlarged schematic diagram of point B in the middle.

[0027] The markings in the accompanying drawings are as follows: test box 1, mounting base 2, concrete component 3, support shaft 4, liquid storage tank 5, airbag assembly 6, pipeline 7, slide 8, slide seat 9, fixed plate 10, movable plate 11, guide block 12, connecting groove 13, limit block 14, valve body 15, closing plate 16, connecting spring 17, threaded sleeve 18, connecting ring 19, support rod 20, clamping plate 21, receiving groove 22, limit groove 23, limit pin 24, concave cavity 25, and base 26. DETAILED DESCRIPTION

[0028] like Figures 1 to 5 As shown:

[0029] A bridge concrete durability test device includes a test box 1 and a concrete component 3. The test box 1 is equipped with a mounting base 2, and the concrete component 3 is detachably connected to the mounting base 2. A plurality of support shafts 4 are distributed in a circular array on the mounting base 2 with the concrete component 3 as the center. Support plates are provided between adjacent support shafts 4. A force-applying airbag wrapping the concrete component 3 is provided between the support plate and the concrete component 3. A liquid storage tank 5 is provided in the test box 1 for pumping a filling liquid into the force-applying airbag, and the filling liquid is a salt water mixture. A plurality of pressure relief valves are provided on the inner wall of the force-applying airbag. Detection equipment is provided on the concrete component 3.

[0030] In this solution, a salt water mixture of the required concentration is prepared as the filling liquid, and the concrete component 3 is connected to the mounting base 2. The filling liquid simulating seawater is then pumped into the force-applying airbag through the liquid storage tank 5. After the force-applying airbag expands, it is supported and restricted by the support plate and relatively evenly wraps the concrete component 3, thereby applying pressure to the concrete component 3. When the pressure inside the force-applying airbag reaches the intensity required for the test, the excess filling liquid is discharged through the pressure relief valve, so that the filling liquid is sprayed onto the concrete component 3, keeping the pressure of the force-applying airbag at the parameters required for the test.

[0031] The effective effect of this solution is: the force-applying airbag is used to apply pressure to the concrete component 3 more evenly, simulating the scenario where seawater pressure affects the bridge pier, and can more accurately test the durability of the bridge concrete in the marine environment; in addition, the excess filling liquid is discharged to the surface of the concrete component 3 through the pressure relief valve, while stabilizing the pressure applied by the force-applying airbag to the concrete component 3, thereby simulating the corrosiveness of seawater on the bridge concrete, thereby more accurately simulating the impact of the marine environment on the bridge concrete and improving the accuracy of the test.

[0032] In this embodiment, the force-applying airbag includes several groups of airbag assemblies 6, which are stacked in sequence from bottom to top to wrap around the concrete component 3; the liquid storage tank 5 is provided with several liquid storage chambers (not shown in the figure) corresponding to the number of airbag assemblies 6, and the liquid storage chambers are all filled with filling liquid. The liquid storage chambers are all connected to pipes 7, and the pipes 7 pass through the corresponding movable plates 11 and are connected to the corresponding airbag assemblies 6.

[0033] The force-applying airbags are configured as a plurality of airbag assemblies 6, and the filling liquid can be pumped into different airbag assemblies 6 through the corresponding liquid storage chambers. The height of the area to which the concrete component 3 is subjected to pressure can be adjusted, thereby simulating the ocean environment at different depths, thereby improving the test accuracy. In addition, the concentration of the filling liquid in the liquid storage chamber can be adjusted according to the test requirements, so that different parts of the concrete component 3 are exposed to different concentrations of filling liquid, thereby simulating different conditions with different concentrations of residual seawater, thereby improving the test accuracy.

[0034] In this embodiment, the mounting base 2 is provided with a plurality of slide grooves 8 distributed in a circular array, and the slide grooves 8 are all facing the concrete member 3. The bottom of the support shaft 4 is fixed with a slide seat 9 connected to the slide groove 8, and a locking structure is provided between the support shaft 4 and the slide groove 8; the support plate includes a fixed plate 10 and a movable plate 11, and the fixed plate 10 and the movable plate 11 are both arc-shaped. The opposite ends of the fixed plate 10 and the movable plate 11 are hinged to the corresponding support shaft 4, and an arc-shaped groove is provided on the other end of the fixed plate 10, and the groove is hinged to the corresponding support shaft 4. The fixed plate 10 has the same arc, and the other end of the movable plate 11 is slidably connected to the groove; one end of the airbag assembly 6 is fixedly connected to one of the movable plates 11, and a through groove is provided on the movable plate 11. The other end of the airbag assembly 6 extends from the through groove, and a guide block 12 made of rubber is provided on the side of the airbag assembly 6 facing the support plate. A guide groove is provided on the guide block 12, and a plurality of connecting grooves 13 for accommodating the guide blocks 12 are provided on the side wall of the support shaft 4, and a limit block 14 inserted into the groove is rotatably provided in the connecting groove 13.

[0035] According to the different sizes of the concrete component 3, the distance between the support shaft 4 and the concrete component 3 is adjusted by sliding the slide 9, and the area between the support plate and the concrete component 3 is adjusted by coordinating the relative sliding between the fixed plate 10 and the movable plate 11, thereby controlling the collision degree of the airbag assembly 6, thereby limiting the pressure applied to the concrete component 3 after the airbag assembly 6 is expanded, and preventing the pressure from being too large or too small, which affects the experimental results; in addition, during the adjustment process of the support shaft 4, the length of the airbag team is adjusted by stretching the other end of the airbag assembly 6, so that the airbag assembly 6 can wrap the concrete component 3 more accurately, and cooperate with the position adjustment of the support shaft 4 to be suitable for concrete components 3 of different sizes; and during the adjustment process of the airbag assembly 6, the connection groove 13 and the limit block 14 cooperate to prevent the airbag assembly 6 from detaching, and also play a guiding role.

[0036] In this embodiment, the pressure relief valve includes a tubular valve body 15, which is fixed to and communicates with the airbag assembly 6. The inner diameter of the end of the valve body 15 facing the concrete member 3 is larger than the inner diameter of the other end. A closing plate 16 is slidably provided in the valve body 15. The closing plate 16 is used to close the end of the valve body 15 with a smaller inner diameter, and a connecting spring 17 facing the concrete member 3 is fixed to the closing plate 16. A connecting sleeve is threadedly connected to the end of the valve body 15 facing the concrete member 3. An annular groove is provided on the inner wall of the connecting sleeve. A connecting ring 19 is rotatably connected to the annular groove. A support rod 20 is fixed between the connecting ring 19 and the connecting spring 17.

[0037] In this solution, when the pressure in the airbag assembly 6 is low, the force exerted by the filling liquid on the closing plate 16 cannot overcome the elastic force of the connecting spring 17, and the closing plate 16 is prohibited; as the pressure inside the airbag assembly 6 increases, the filling liquid squeezes the closing plate 16 toward the end with a larger inner diameter in the valve body 15, and continuously squeezes the connecting spring 17; when the pressure inside the airbag assembly 6 reaches the required level, the filling liquid pushes the closing plate 16 to the end with a larger inner diameter of the valve body 15, so that a gap appears between the closing plate 16 and the valve body 15, and the excess filling liquid flows out through the valve body 15, thereby maintaining the pressure inside the airbag assembly 6 at the required level, thereby improving the accuracy of the airbag assembly 6 in applying pressure to the concrete component 3, thereby improving the test accuracy.

[0038] In addition, by rotating the connecting sleeve, the relative position relationship between the connecting sleeve and the valve body 15 is adjusted, and the distance between the closing plate 16 and the end with the larger inner diameter of the valve body 15 is adjusted, that is, the pressure required to be reached inside the airbag assembly 6 when the filling liquid is discharged is adjusted.

[0039] In this embodiment, a plurality of depressions are provided on the end surface of the airbag assembly 6 facing the concrete component 3 , and the pressure relief valves are all provided in the corresponding depressions.

[0040] By providing the recess, when the airbag assembly 6 expands and covers the concrete component 3, the pressure relief valve is prevented from abutting against the concrete component 3, thereby damaging the concrete component 3 and affecting the test accuracy.

[0041] In this embodiment, a clamping plate 21 is hinged at the edge of the through slot, and the clamping plate 21 is locked with the through slot. A receiving groove 22 for accommodating the guide block 12 is opened on the side wall of the clamping plate 21.

[0042] Through the cooperation between the clamping plate 21 and the through groove, the airbag assembly 6 is clamped at the required length position to prevent the filling liquid from flowing into the excess length area of ​​the airbag assembly 6; in addition, the hand guide block 12 is accommodated to a certain extent by the storage groove 22 to prevent the guide block 12 from being squeezed by the clamping plate 21 and excessively deformed.

[0043] In this embodiment, the locking structure includes a through hole provided on the slide 9 , a plurality of limiting grooves 23 are evenly distributed on the bottom of the slide 8 , and limiting pins 24 are inserted between the through hole and the limiting grooves 23 .

[0044] When the position of the support shaft 4 needs to be adjusted, the limit pin 24 is removed and the slide 9 is slid; after the adjustment is completed, the limit pin 24 is inserted into the limit groove 23 and the corresponding through hole to lock the slide 9 and the support shaft 4. The whole operation process is convenient and fast.

[0045] In this embodiment, a coaxial cavity 25 is provided on the mounting base 2 , a drainage facility is provided at the bottom of the cavity 25 , a pedestal 26 is provided in the cavity 25 , and the concrete component 3 is detachably connected to the pedestal 26 .

[0046] The inflowing filling liquid is discharged through the drainage facility at the bottom of the cavity 25 to avoid accumulation of the filling liquid.

[0047] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A bridge concrete durability testing device, characterized by: The test chamber comprises a test chamber and a concrete component. The test chamber has a mounting base built into it, and the concrete component is detachably connected to the mounting base. The mounting base is provided with a plurality of support shafts arranged in a circular array centered on the concrete component, with support plates disposed between adjacent support shafts. A force-applying airbag is disposed between the support plates and the concrete component, wrapping around the concrete component. The test chamber contains a liquid reservoir for pumping a filling liquid into the force-applying airbag, wherein the filling liquid is a salt water mixture. Several pressure relief valves are disposed on the inner walls of the force-applying airbags. A detection device is disposed on the concrete component. The pressure relief valve comprises a tubular valve body, which is fixed to and communicates with the airbag assembly. The inner diameter of the valve body at one end facing the concrete component is larger than that at the other end. A sealing plate is slidably disposed within the valve body, which is used to seal the smaller end of the valve body. A connecting spring facing the concrete component is fixed to the sealing plate. A connecting sleeve is threadedly connected to the end of the valve body facing the concrete component. The inner wall of the connecting sleeve has an annular groove formed therein, and a connecting ring is rotatably connected within the annular groove. A support rod is fixed between the connecting ring and the connecting spring.

2. A bridge concrete durability testing device according to claim 1, characterized in that: The force-applying airbag includes several groups of airbag assemblies, which are stacked in sequence from bottom to top to wrap around the concrete component; the liquid storage tank is provided with several liquid storage cavities corresponding to the number of airbag assemblies, each of which is filled with filling liquid, and the liquid storage cavities are connected to the corresponding airbag assemblies.

3. A bridge concrete durability testing device according to claim 2, characterized in that: Material toggling mechanism, its both sides respectively have a cylinder pressure, and the cylinder pressure bar connects swing arm, and the swing arm end face has hook portion, and a bar passes position between the end of two swing arms and the hook portion. The swing arm ends up being rotated with the hook portion. The swing arm ends are rotated with the hook portion.

4. A bridge concrete durability testing device according to claim 3, characterized in that: The airbag assembly is provided with a plurality of recesses on the end surface facing the concrete component, and the pressure relief valves are all provided in the corresponding recesses.

5. The bridge concrete durability testing device according to claim 4, characterized in that: A clamping plate is hinged at the edge of each through slot, and the clamping plate is clamped with the through slot. A receiving groove for accommodating the guide block is provided on the side wall of the clamping plate.

6. A bridge concrete durability testing device according to claim 5, characterized in that: The locking structure includes a through hole arranged on the slide seat, a plurality of limiting grooves are evenly distributed on the bottom of the slide seat, and a limiting pin is inserted between the through hole and the limiting groove.

7. A bridge concrete durability testing device according to claim 6, characterized in that: A coaxial concave cavity is provided on the installation base, a drainage facility is provided at the bottom of the concave cavity, a pedestal is provided in the concave cavity, and the concrete component is detachably connected to the pedestal.

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