Roadbed and pavement strength tester

Abstract

The utility model discloses a roadbed and pavement strength tester, which belongs to the technical field of roadbed and pavement detection, and comprises a bottom plate, four guide posts are fixed on the bottom plate, a top plate is fixed at the ends of the guide posts far away from the bottom plate, a support plate is connected outside every two guide posts in a sliding manner, a fixed rod is fixed between every two support plates, and the fixed rod is fixed on the bottom plate. The fixing rods are rotatably connected with fixing discs, the sides, away from the fixing rods, of the fixing discs are rotatably connected with clamping rods, a testing ball is placed between the two clamping rods, and the side face of the supporting plate is connected with a lifting driving piece. The tester is high in test accuracy, convenient to operate and high in test efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of subgrade and pavement detection, and particularly relates to a subgrade and pavement strength tester. Background Art

[0002] The subgrade is the foundation of the track or pavement and is a geotechnical structure formed by excavation or filling. The main function of the subgrade is to provide necessary conditions for the laying of the track or pavement and the operation of trains or vehicles, and to bear the static and dynamic loads of the track and rolling stock or the pavement and traffic loads, and at the same time transfer and disperse the loads deep into the foundation. The pavement refers to a layered structure directly bearing the vehicle loads paved on the road subgrade with various road construction materials. A pavement with good quality should have sufficient strength and good stability, and its surface should meet the requirements of flatness, density and anti-skid. The pavement structure consists of a surface layer, a base layer and a cushion layer.

[0003] The test of subgrade strength needs to detect multiple points to achieve the accuracy of the test. The existing subgrade strength test devices are more troublesome to operate, resulting in low work efficiency.

[0004] For the above problems, a subgrade and pavement strength test device is disclosed in Patent CN 201921550368.X, including a movable frame. A guide rod is longitudinally penetrated through the movable frame, and the guide rod is slidably connected with the movable frame. And a screw rod is longitudinally penetrated through one side of the movable frame, and the screw rod is threadedly connected with the movable frame. The upper and lower ends of the guide rod and the screw rod are respectively connected with a top plate and a bottom plate, and the upper end of the screw rod passes through the top plate and is connected with a crank. The two sides of the movable frame are respectively transversely provided with a first support rod and a second support rod. The first support rod penetrates through the movable frame and is threadedly connected with the movable frame. And one ends of the first support rod and the second support rod are respectively connected with a positioning plate, and a sphere is clamped between the positioning plates. A through hole is opened on the bottom plate. The subgrade and pavement strength test device adopts the structural design of the positioning plate, which can conveniently fix the sphere, and through the structural design of the screw rod and the movable frame, the height adjustment of the sphere is more convenient, so that the operation of the staff for testing the strength of the subgrade is more convenient.

[0005] However, the inventor believes that in the above technology, during the test, the level of the tester needs to be adjusted multiple times to keep it level, resulting in low test efficiency. At the same time, the test sphere is clamped by the movable frame, and its structure is not restricted, so the sphere cannot ensure that its center of gravity is located at the center of the movable frame. Therefore, the accuracy of the test result is reduced, and the above technology can be further improved. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a subgrade and pavement strength tester, which has high test accuracy, convenient operation and high test efficiency.

[0007] To achieve the above object, the utility model provides the following technical solution: A roadbed and pavement strength tester, including a bottom plate, on which a guiding column is fixed. The end of the guiding column far from the bottom plate is fixed with a top plate. There are four guiding columns. A support plate is slidably connected to the outside of every two guiding columns. A fixing rod is fixed between the two support plates. A fixing disk is rotatably connected to the fixing rod. A clamping rod is rotatably connected to the side of the fixing disk far from the fixing rod. A test sphere is placed between the two clamping rods. A lifting driving member is connected to the side of the support plate.

[0008] Further, a scale bar is provided on one of the guiding columns.

[0009] Further, a first spherical clamping groove is fixed in the middle of the fixing rod. A first spherical connecting block is rotatably connected inside the first spherical clamping groove. The fixing disk is fixed to the end of the first spherical connecting block far from the first spherical clamping groove.

[0010] Further, a traction rope is fixed to the side of the fixing disk far from the first spherical connecting block. A number of traction ropes are arranged along the circumferential direction of the fixing disk. A lead ball is fixed to the end of the traction rope far from the fixing disk.

[0011] Further, a connecting seat is fixed on the fixing disk. The connecting seats are symmetrically arranged about the middle of the fixing disk. The clamping rod is rotatably connected inside the connecting seat. A clamping plate is fixed to the end of the clamping rod far from the connecting seat. A number of wedge-shaped blocks are fixed on the inner wall of the clamping plate. At a position corresponding to the wedge-shaped blocks, a groove is provided on the side of the test sphere for clamping the wedge-shaped blocks. A piston rod is fixed to the end of the clamping rod close to the connecting seat. The other end of the piston rod is fixed to a cylinder. The cylinder is fixed to the bottom of the fixing disk.

[0012] Further, the lifting driving member includes an ear plate fixed to the side of the support plate. A lead screw is threadedly connected inside the ear plate. The two ends of the lead screw are respectively rotatably connected to the side of the top plate and the bottom plate. A servo motor is fixed to the end of the lead screw close to the top plate. The servo motor is screwed to the top plate. The two servo motors are connected in series.

[0013] Further, a second spherical clamping groove is fixed to the bottom plate. A second spherical connecting block is rotatably connected inside the second spherical clamping groove. A support column foot is fixed to the end of the second spherical connecting block far from the second spherical clamping groove.

[0014] The beneficial effects of the utility model are:

[0015] The roadbed and pavement strength tester is provided with a spherical connection structure at the upper end of the fixed plate for placing the test sphere. Combined with the application of the lead ball, the test sphere can be automatically kept in the vertical direction without additional fine adjustment steps, so the test efficiency is improved. The roadbed and pavement strength tester is provided with a clamping plate with a wedge block for fixing the test sphere, and a groove is correspondingly arranged on the test sphere. Thus, when the test sphere is placed, its center of gravity position remains unchanged and the test result is accurate. The servo motor and the cylinder are used for driving, respectively for adjusting the height of the test sphere and lowering the test sphere, and it can be remotely controlled, which is convenient for operation. Brief Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the roadbed and pavement strength tester provided by the present utility model;

[0017] Figure 2 is of the roadbed and pavement strength tester provided by the present utility model Figure 1 side schematic diagram;

[0018] Figure 3 is a schematic structural diagram of the fixed plate of the roadbed and pavement strength tester provided by the present utility model.

[0019] In the figure: 1, bottom plate; 2, guide post; 3, top plate; 4, support plate; 5, fixed rod; 6, fixed plate; 7, clamping rod; 8, test sphere; 9, scale bar; 10, first spherical card slot; 11, first spherical connection block; 12, support column foot; 13, towing rope; 14, lead ball; 15, connecting seat; 16, clamping plate; 17, wedge block; 18, groove; 19, piston rod; 20, cylinder; 21, ear plate; 22, lead screw; 23, servo motor; 24, second spherical card slot; 25, second spherical connection block. Detailed Description of the Preferred Embodiment

[0020] In order to further understand the content, features and effects of the present utility model, the following embodiments are exemplified and described in detail in conjunction with the accompanying drawings.

[0021] Please refer to Figures 1 to 3 simultaneously. The roadbed and pavement strength tester according to the embodiment of the present utility model will be described in detail below with reference to the accompanying drawings.

[0022] As shown in Figure 1As shown in the figure, the subgrade and pavement strength tester includes a bottom plate 1. A guiding column 2 is fixed on the bottom plate 1. The top plate 3 is fixed at the end of the guiding column 2 away from the bottom plate 1. There are four guiding columns 2. A scale bar 9 is provided on one of the guiding columns 2. A support plate 4 is slidably connected to the outside of every two guiding columns 2. A fixing rod 5 is fixed between the two support plates 4. A fixing disk 6 is rotatably connected to the fixing rod 5. A clamping rod 7 is rotatably connected to the side of the fixing disk 6 away from the fixing rod 5. A test sphere 8 is placed between the two clamping rods 7. A lifting driving member is connected to the side of the support plate 4.

[0023] A first spherical card slot 10 is fixed in the middle of the fixing rod 5. A first spherical connecting block 11 is rotatably connected inside the first spherical card slot 10. The fixing disk 6 is fixed at the end of the first spherical connecting block 11 away from the first spherical card slot 10. Thus, the fixing disk 6 can rotate freely relative to the fixing rod 5. Through the spherical connection method, the fixing disk 6 can rotate freely, and then the clamping rod 7 connected to the fixing disk 6 can rotate freely.

[0024] At the same time, a traction rope 13 is fixed at the end of the fixing disk 6 away from the first spherical connecting block 11. A number of traction ropes 13 are arranged along the circumferential direction of the fixing disk 6. A lead ball 14 is fixed at the end of the traction rope 13 away from the fixing disk 6. Under the action of its own gravity, the lead ball 14 always maintains the vertical direction. Thus, under the action of multiple lead balls 14, the fixing disk 6 can always be kept vertically placed.

[0025] At the same time, a connecting seat 15 is fixed on the fixing disk 6. The connecting seats 15 are symmetrically arranged about the middle of the fixing disk 6. The clamping rod 7 is rotatably connected inside the connecting seat 15. A clamping plate 16 is fixed at the end of the clamping rod 7 away from the connecting seat 15. A number of wedge-shaped blocks 17 are fixed on the inner wall of the clamping plate 16. A groove 18 is provided on the side of the test sphere 8 corresponding to the position of the wedge-shaped block 17 for clamping the wedge-shaped block 17. A piston rod 19 is fixed at the end of the clamping rod 7 close to the connecting seat 15. The other end of the piston rod 19 is fixed with a cylinder 20. The cylinder 20 is fixed at the bottom of the fixing disk 6. The test sphere 8 can be placed between the two clamping rods 7. At the same time, in order to improve the placement stability of the test sphere 8, a groove 18 is provided on the side of the test sphere 8. The position of the groove 18 corresponds to the position of the wedge-shaped block 17 on the clamping rod 7. After the test sphere 8 slides horizontally into the space between the two clamping rods 7 along the side direction, the test sphere 8 can be stably placed between the two clamping rods 7. At the same time, after the test sphere 8 is placed, combined with the above-mentioned lead balls 14, the test sphere 8 can always be kept in the vertical direction.

[0026] In addition, the lifting drive member includes an ear plate 21 fixed to the side surface of the support plate 4. A lead screw 22 is threadedly connected inside the ear plate 21. The two ends of the lead screw 22 are respectively rotatably connected to the side surfaces of the top plate 3 and the bottom plate 1. A servo motor 23 is fixed to the end of the lead screw 22 close to the top plate 3. The servo motor 23 is fixed to the top plate 3 by screws. The two servo motors 23 are connected in series. In this embodiment, when the servo motor 23 rotates forward, it can drive the lead screw 22 to rotate clockwise, and then the support plate 4 moves downward synchronously with the ear plate 21. On the contrary, the support plate 4 moves upward. When the support plate 4 moves, it drives the fixing rod 5 and the fixing disk 6 to move synchronously.

[0027] In addition, a second spherical card slot 24 is fixed to the bottom plate 1. A second spherical connection block 25 is rotatably connected inside the second spherical card slot 24. A support column foot 12 is fixed to the end of the second spherical connection block 25 away from the second spherical card slot 24. The support column foot 12 can rotate freely. Due to the spherical connection method, after the entire tester is placed on the road surface, it can be used directly without fine-tuning.

[0028] The principle of the present utility model: Place the entire tester at the test position. Since the support column foot 12 can rotate freely, the tester can be kept stable during placement. Generally, the test road surface is a concrete or asphalt road surface, which has a little pothole and inclination. Therefore, no fine-tuning is required. Under the action of the gravity of the lead ball 14, the test sphere 8 can be automatically kept vertical. At the same time, the height of the support plate 4 is controlled by controlling the servo motor 23. Taking the scale on the guide post 2 as a reference, the support plate 4 is adjusted to the test height. Open the air cylinder 20. The air cylinder 20 drives the clamping rod 7 to rotate at the rotation point with the connecting seat 15, and lower the test sphere 8. Under the action of gravity, it makes a free fall motion and hits the roadbed. The smaller the penetration depth, the higher the strength of the roadbed. According to the principle that the work done by the test sphere 8 falling freely from a certain height into the roadbed is equal to the work done by the indoor standard test penetration depth, the on-site CBR value can be deduced from the value of the drop ball indentation diameter D.

[0029] In this embodiment, the power supply of the servo motor 23 and the air cylinder 20 can be realized by an external battery pack. At the same time, the control of the servo motor 23 and the air cylinder 20 can be remotely controlled, which are all realized based on the existing technology.

[0030] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A roadbed and pavement strength tester, characterized in that, The tester includes a bottom plate (1), on which a guide post (2) is fixed. The end of the guide post (2) far from the bottom plate (1) is fixed with a top plate (3). There are four guide posts (2). A support plate (4) is slidably connected to the outside of every two guide posts (2). A fixing rod (5) is fixed between the two support plates (4). A fixing disk (6) is rotatably connected to the fixing rod (5). A clamping rod (7) is rotatably connected to the side of the fixing disk (6) far from the fixing rod (5). A test sphere (8) is placed between the two clamping rods (7). A lifting driving member is connected to the side of the support plate (4).

2. The subgrade and pavement strength tester according to claim 1, wherein A scale bar (9) is provided on one of the guide posts (2).

3. The roadbed and pavement strength tester according to claim 1, characterized in that, A first spherical clamping groove (10) is fixed in the middle of the fixing rod (5). A first spherical connecting block (11) is rotatably connected inside the first spherical clamping groove (10). The fixing disk (6) is fixed to the end of the first spherical connecting block (11) far from the first spherical clamping groove (10).

4. The roadbed and pavement strength tester according to claim 3, characterized in that, A traction rope (13) is fixed to the end of the fixing disk (6) far from the first spherical connecting block (11). A number of traction ropes (13) are arranged along the circumferential direction of the fixing disk (6). A lead ball (14) is fixed to the end of the traction rope (13) far from the fixing disk (6).

5. The roadbed and pavement strength tester according to claim 1, characterized in that, A connecting seat (15) is fixed on the fixing disk (6). The connecting seats (15) are symmetrically arranged about the middle of the fixing disk (6). The clamping rod (7) is rotatably connected inside the connecting seat (15). A clamping plate (16) is fixed to the end of the clamping rod (7) far from the connecting seat (15). A number of wedge-shaped blocks (17) are fixed on the inner wall of the clamping plate (16). At the position corresponding to the wedge-shaped block (17), a groove (18) is provided on the side of the test sphere (8) for clamping the wedge-shaped block (17). A piston rod (19) is fixed to the end of the clamping rod (7) close to the connecting seat (15). The other end of the piston rod (19) is fixed with a cylinder (20). The cylinder (20) is fixed to the bottom of the fixing disk (6).

6. The roadbed and pavement strength tester according to claim 1, wherein The lifting driving member includes an ear plate (21) fixed to the side of the support plate (4). A lead screw (22) is threadedly connected inside the ear plate (21). The two ends of the lead screw (22) are respectively rotatably connected to the side of the top plate (3) and the bottom plate (1). A servo motor (23) is fixed to the end of the lead screw (22) close to the top plate (3). The servo motor (23) is fixed to the top plate (3) with screws. The two servo motors (23) are connected in series.

7. The roadbed and pavement strength tester according to claim 1, characterized in that, A second spherical clamping groove (24) is fixed to the bottom plate (1). A second spherical connecting block (25) is rotatably connected inside the second spherical clamping groove (24). A support column foot (12) is fixed to the end of the second spherical connecting block (25) far from the second spherical clamping groove (24).

Images