Device for testing bearing capacity of regenerated cement macadam base

Abstract

The utility model provides a regenerated cement macadam base bearing capacity testing device, and relates to the field of bearing capacity testing, the regenerated cement macadam base bearing capacity testing device comprises a frame and a plurality of supporting legs installed at the bottom of the frame, each supporting leg is of a telescopic structure, and the supporting legs are arranged on the frame. A hydraulic cylinder is fixedly mounted at the bottom of the frame, a push rod is fixedly connected to the output end of the hydraulic cylinder, and bases are rotationally mounted at the bottom ends of the push rod and the supporting legs; according to the device for testing the bearing capacity of the regenerated cement macadam base, the pressure application area of the bearing assembly can be selected according to actual test requirements, for a thicker base, the pressure application area can be increased, the load can be more uniformly distributed on the surface of the base, the bearing capacity of the base is more comprehensively reflected, and for a thinner base, the pressure application area can be selectively reduced, so that the test efficiency is improved. The bearing plate with a small pressure application area can avoid test data distortion caused by the fact that the bearing plate is too large to exceed the effective bearing range of the base layer.

Description

Technical Field

[0001] This utility model relates to the field of load-bearing capacity testing, specifically a testing device for the load-bearing capacity of recycled cement crushed stone base courses. Background Technology

[0002] Load-bearing capacity testing is a method for evaluating the performance of materials or structures under external loads. In the field of road engineering, for recycled cement-aggregate base courses, load-bearing capacity testing mainly determines how much traffic load they can withstand without excessive deformation or damage. The load-bearing capacity test for recycled cement-aggregate base courses typically uses the bearing plate method, which involves placing a bearing plate on the surface of the recycled cement-aggregate base course and applying a gradually increasing static vertical load using loading equipment such as jacks. According to elasticity theory, when a circular uniformly distributed load is applied to the surface of a semi-infinite elastic medium (the base course can be approximated as this medium), there is a certain relationship between the load and deformation. The load-bearing capacity of the base course is evaluated through the resilient modulus. The higher the resilient modulus, the stronger the base course's resistance to deformation under load, and the better its load-bearing capacity.

[0003] The size of the bearing plate in existing testing devices is fixed, making it difficult to adjust flexibly according to different base thicknesses or terrain conditions. For example, for thicker bases, if the bearing plate area is too small, the load transfer will be uneven, making it difficult to accurately reflect the overall bearing capacity of the base. For thinner bases, an excessively large bearing plate may exceed the effective bearing range of the base, leading to distorted test data. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a testing device for the load-bearing capacity of recycled cement-aggregate base courses, thus solving the problem of improving the load-bearing capacity of base courses.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a testing device for the bearing capacity of recycled cement crushed stone base course, comprising a frame and legs installed at the bottom of the frame, wherein the number of legs is set to several, each of which is a telescopic structure, a hydraulic cylinder is fixedly installed at the bottom of the frame, a push rod is fixedly connected to the output end of the hydraulic cylinder, a base is rotatably installed at the bottom end of the push rod and the several legs, a guide rail is fixedly connected to the bottom surface of the base near the push rod, two movable blocks are slidably connected in the guide rail, a screw for adjusting the position of the movable blocks is installed in the guide rail, and a bearing component is installed at the bottom of the two movable blocks.

[0006] The load-bearing assembly includes several load-bearing plates and several connectors. Each load-bearing plate has a groove inside that is adapted to the movable block. Every two load-bearing plates are hinged together by connectors.

[0007] Preferably, the two ends of the lead screw are rotatably connected to the two sides of the guide rail, and the outer surface of the lead screw is threadedly connected to two movable blocks, with the two threads on the outer surface of the lead screw arranged in opposite directions.

[0008] Preferably, each of the legs includes an I-beam, a fixing member, a column, and a fixing cylinder. The I-beam is fixed to the fixing member and the frame by screws. The fixing member is fixedly connected to the column and slidably connected to the fixing cylinder. The bottom ends of the push rod and the fixing cylinder are rotatably connected to the base adjacent to them by a rotating shaft.

[0009] Preferably, each of the fixed cylinders has a connecting block fixedly connected to its outer surface, and each connecting block has an insertion hole inside. The frame has two threaded rods rotatably connected inside, and the outer surfaces of the two threaded rods are threadedly connected to lifting blocks. The two sides of the two lifting blocks are fixedly connected to insertion rods, and the other end of each insertion rod is inserted into the insertion hole adjacent to it.

[0010] Preferably, the connecting component includes steel component A, steel component B, and a fixed shaft. The bottom surfaces of steel component A and steel component B are fixedly connected to the upper surface of the adjacent bearing plate, and the fixed shaft is rotatably connected to both steel component A and steel component B.

[0011] Compared with existing technologies, this utility model has the following advantages: By adjusting the position between the two movable blocks through the set bearing components, the pressure area can be changed, which can be selected according to actual testing needs. For thicker base layers, the pressure area can be increased, allowing the load to be distributed more evenly on the base surface and more comprehensively reflecting the load-bearing capacity of the base layer. For thinner base layers, the pressure area can be reduced. A smaller pressure area bearing plate can avoid the test data distortion caused by the bearing plate being too large and exceeding the effective load-bearing range of the base layer. When facing different terrains, the height of the outriggers can be adjusted to allow the hydraulic cylinder to apply pressure vertically, avoiding deviations in test results due to the generation of horizontal components. Moreover, for base layers of different thicknesses, the adjustable outriggers can appropriately adjust the height of the support frame. When the base layer is thicker, the outriggers can be raised, and when the base layer is thinner, the outrigger height can be lowered to ensure the stability of the device and thus ensure testing accuracy. Furthermore, the entire device is detachable, facilitating transportation and storage. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 This is a sectional view of the guide rail, movable block, and load-bearing component of this utility model from the side.

[0014] Figure 3 This is a sectional view of the front view of the guide rail, movable block and load-bearing component of this utility model;

[0015] Figure 4This is a schematic diagram of the structure of the support leg of this utility model;

[0016] Figure 5 This is a structural schematic diagram of the connecting block, threaded rod, and lifting block of this utility model;

[0017] Figure 6 This is a schematic diagram of the load-bearing component structure of this utility model;

[0018] Figure 7 This is a schematic diagram of the structure of the connector of this utility model;

[0019] Figure 8 This is an exploded view of the connector of this utility model;

[0020] Figure 9 This is a schematic diagram of the base structure of this utility model;

[0021] Figure 10 This is a schematic diagram of the frame structure of this utility model.

[0022] The components are as follows: 1. Frame; 2. Support leg; 201. I-beam; 202. Fixing component; 203. Column; 204. Fixing cylinder; 205. Rotating shaft; 3. Hydraulic cylinder; 4. Push rod; 5. Base; 6. Guide rail; 7. Movable block; 8. Lead screw; 9. Bearing assembly; 901. Bearing plate; 902. Connecting component; 911. Steel component A; 912. Steel component B; 913. Fixing shaft; 17. Slide groove; 18. Connecting block; 19. Threaded rod; 20. Lifting block; 10. Insert rod. Detailed Implementation

[0023] like Figures 1-10As shown, a testing device for the bearing capacity of recycled cement-aggregate base course includes a frame 1 and several legs 2 installed at the bottom of the frame 1. Each leg 2 includes an I-beam 201, a fixing member 202, a column 203, and a fixing cylinder 204. The I-beam 201 is fixed to the fixing member 202 and the frame 1 by screws. The fixing member 202 is fixedly connected to the column 203 and slidably connected to the fixing cylinder 204. The bottom ends of the push rod 4 and the fixing cylinder 204 are close to each other via a rotating shaft 205. The base 5 is rotatably connected, and the I-beam 201 is fixed to the fixing part 202 and the frame 1 by screws, which facilitates the disassembly and assembly of the support leg 2. The fixing cylinder 204 and the column 203 can also be easily disassembled and assembled, thus facilitating transportation and storage. Each fixing cylinder 204 has a connecting block 18 fixedly connected to its outer surface, and each connecting block 18 has an insertion hole inside. Two threaded rods 19 are rotatably connected inside the frame 1, and lifting blocks 20 are threadedly connected to the outer surfaces of the two threaded rods 19. The two lifting blocks 20 have lifting blocks on both sides... Each support leg 2 is fixedly connected to a plug rod 10, with the other end of each plug rod 10 inserted into a nearby plug hole. A handle is fixedly connected to the upper end of each of the two threaded rods 19. Rotating the handle allows the threaded rod 19 to rotate, thus enabling the support legs 2 to extend and retract. Each support leg 2 is a telescopic structure. A hydraulic cylinder 3 is fixedly installed at the bottom of the frame 1. A push rod 4 is fixedly connected to the output end of the hydraulic cylinder 3. A base 5 is rotatably installed at the bottom end of the push rod 4 and several support legs 2. A guide rail 6 is fixedly connected to the bottom surface of the base 5 near the push rod 4. There are two movable blocks 7 slidingly connected inside the guide rail 6. The movable blocks 7 are I-shaped. A lead screw 8 for adjusting the position of the movable blocks 7 is installed inside the guide rail 6. The two ends of the lead screw 8 are rotatably connected to the two sides of the guide rail 6 respectively. The outer surface of the lead screw 8 is threadedly connected to the two movable blocks 7. The two threads on the outer surface of the lead screw 8 are arranged in opposite directions. By rotating the lead screw 8, the two movable blocks 7 can be moved in opposite directions, thereby adjusting the position of the two movable blocks 7. A bearing assembly 9 is installed at the bottom of the two movable blocks 7. The bottom of the bearing assembly 9 is used to install a pressure sensor.

[0024] The load-bearing assembly 9 includes several load-bearing plates 901 and several connecting parts 902. The connecting parts 902 include steel parts A911, steel parts B912 and a fixed shaft 913. The bottom surfaces of steel parts A911 and B912 are fixedly connected to the upper surfaces of the adjacent load-bearing plates 901. The fixed shaft 913 is rotatably connected to steel parts A911 and B912. Each load-bearing plate 901 has a sliding groove 17 adapted to the movable block 7. The sliding groove 17 is T-shaped. Several sliding grooves 17 are connected in sequence. Each movable block 7 is slidably connected to its adjacent sliding groove 17. The movable block 7 and the load-bearing assembly 9 are easy to disassemble and assemble. Every two load-bearing plates 901 are hinged together by the connecting parts 902. Every two load-bearing plates 901 are in contact with each other.

[0025] In use, the entire unit is first placed on the recycled cement aggregate base to be tested. Then, pressure is applied to the push rod 4 by the hydraulic cylinder 3. The push rod 4 descends via the base 5 and the guide rail 6, which transmits the pressure to the two movable blocks 7. The two movable blocks 7 apply pressure to the adjacent bearing plate 901. The bottom of the bearing plate 901 is used to install pressure sensors. By installing the pressure sensors on the contact surface between the bearing plate 901 and the recycled cement aggregate base, the pressure transmitted by the bearing plate 901 to the base can be directly measured, accurately obtaining the magnitude of the load applied to the base. This provides key data for calculating the resilience modulus of the base. It should be noted that the dimensions of the bearing plate 901 in the existing testing device are fixed, making it difficult to flexibly adjust according to different base thicknesses or terrain conditions. For example, for thicker bases, if the area of ​​the bearing plate 901 is too small, the load distribution will be uneven, making it difficult to accurately reflect the overall bearing capacity of the base. For thinner bases, an excessively large bearing plate 901 may exceed the effective bearing range of the base, leading to distorted test data. Therefore, the bearing plate 901 can be adjusted by rotating the screw 8. The two movable blocks 7 move in opposite directions, allowing them to move along the groove 17 in the bearing component 9. The greater the distance between the two movable blocks 7 after they move, the more bearing plates 901 participate in applying pressure, thus increasing the pressure area. Conversely, the smaller the distance between the two movable blocks 7 after they move, the fewer bearing plates 901 participate in applying pressure, thus reducing the pressure area. It should be noted that the choice can be made according to actual testing needs. For thicker base layers, increasing the pressure area allows the load to be distributed more evenly on the base layer surface, more comprehensively reflecting the base layer's bearing capacity. This is because a larger area of ​​bearing plate 901 can cover a larger area of ​​base layer material, reducing the impact of local stress concentration on test results. For thinner base layers, a smaller pressure area can be chosen. A smaller pressure area of ​​bearing plate 901 can avoid the test data being distorted due to the bearing plate 901 being too large and exceeding the effective bearing range of the base layer. For example, in some repair tests on thin base roads, a smaller pressure area of ​​bearing plate 901 can provide more accurate measurements.

[0026] Next, several connecting pieces 902 are installed, their structure resembling a hinge, but with greater structural strength. These connecting pieces 902 are mounted on the upper surface of the support plates 901, allowing the support plates 901 to be hinged. Furthermore, they support changes in the pressure area of ​​the support plates 901; for example, when the two movable blocks 7 move to the two support plates 901 on either side of the center, as shown... Figure 1As shown, during the pressing process, the two outermost bearing plates 901 are subjected to the squeezing force of the recycled cement crushed stone base layer and will fold over, that is, they will not participate in the pressing. The bearing plate 901 closer to the movable block 7 applies pressure to the recycled cement crushed stone base layer, and applies pressure to the bearing plate 901 located in the middle through the connector 902, thereby achieving the purpose of adjusting the pressing area.

[0027] Next, by turning the handle, the threaded rod 19 can be rotated, which drives the lifting block 20 to move. The lifting block 20 drives the adjacent insertion rod 10 to move, the insertion rod 10 drives the connecting block 18 to move, and the connecting block 18 drives the fixed cylinder 204 to move. This allows the fixed cylinder 204 and the column 203 to slide relative to each other, achieving the purpose of adjustable height of the support leg 2. When facing different terrains, such as testing on the base layer of mountain roads, the base layer surface may have a large slope. By adjusting the support leg 2, the frame 1 can be kept in a horizontal state. This ensures that the bearing plate 901 is loaded with pressure vertically downward, avoiding deviations in test results due to the generation of horizontal component forces. Moreover, for base layers of different thicknesses, the adjustable support leg 2 can appropriately adjust the height of the supporting frame 1, so that the hydraulic cylinder 3 and the bearing plate 901 are in the appropriate position. For example, when the base layer is thick, the support leg 2 can be raised to ensure smooth loading operation. When the base layer is thin, the height of the support leg 2 can be lowered to ensure the stability of the device, thereby ensuring test accuracy.

[0028] Next, when the test base surface has a slope, the base 5 is rotatably connected to the fixed cylinder 204. While the base 5 is in contact with the test base surface and remains stable, the hydraulic cylinder 3 can be vertically downward applied pressure by adjusting the extension and retraction of the support leg 2. Similarly, the bearing component 9 can also be in contact with the test base surface to ensure that the test base surface can be evenly stressed and improve the accuracy of the test.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A testing device for the bearing capacity of recycled cement-aggregate base course, comprising a frame (1) and legs (2) installed at the bottom of the frame (1), wherein the number of legs (2) is set to several, characterized in that: Each of the legs (2) is a telescopic structure. A hydraulic cylinder (3) is fixedly installed at the bottom of the frame (1). A push rod (4) is fixedly connected to the output end of the hydraulic cylinder (3). A base (5) is rotatably installed at the bottom end of the push rod (4) and several legs (2). A guide rail (6) is fixedly connected to the bottom surface of the base (5) near the push rod (4). Two movable blocks (7) are slidably connected in the guide rail (6). A screw (8) for adjusting the position of the movable blocks (7) is installed in the guide rail (6). A load-bearing component (9) is installed at the bottom of the two movable blocks (7). The support assembly (9) includes several support plates (901) and several connectors (902). Each support plate (901) has a groove (17) inside that is adapted to the movable block (7). Every two support plates (901) are hinged together by connectors (902).

2. The testing device for the bearing capacity of recycled cement-aggregate base course according to claim 1, characterized in that: The two ends of the lead screw (8) are rotatably connected to the two sides of the guide rail (6), and the outer surface of the lead screw (8) is threadedly connected to two movable blocks (7). The two threads on the outer surface of the lead screw (8) are arranged in opposite directions.

3. The testing device for the bearing capacity of recycled cement-aggregate base course according to claim 1, characterized in that: Each of the legs (2) includes an I-beam (201), a fixing member (202), a column (203), and a fixing cylinder (204). The I-beam (201) is fixed to the fixing member (202) and the frame (1) by screws. The fixing member (202) is fixedly connected to the column (203) and slidably connected to the fixing cylinder (204). The bottom ends of the push rod (4) and the fixing cylinder (204) are rotatably connected to the base (5) adjacent to them by a rotating shaft (205).

4. The testing device for the bearing capacity of recycled cement-aggregate base course according to claim 3, characterized in that: Each of the fixed cylinders (204) has a connecting block (18) fixedly connected to its outer surface. Each connecting block (18) has an insertion hole inside. The frame (1) has two threaded rods (19) rotatably connected inside. The outer surfaces of the two threaded rods (19) are threadedly connected to lifting blocks (20). The two sides of the two lifting blocks (20) are fixedly connected to insert rods (10). The other end of each insert rod (10) is inserted into the insertion hole adjacent to it.

5. The testing device for the bearing capacity of recycled cement-aggregate base course according to claim 1, characterized in that: The connector (902) includes steel part A (911), steel part B (912) and fixed shaft (913). The bottom surfaces of steel part A (911) and steel part B (912) are fixedly connected to the upper surface of the adjacent bearing plate (901). The fixed shaft (913) is rotatably connected to steel part A (911) and steel part B (912).

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