An engineering road surface compressive strength measuring device

Abstract

The present invention discloses a device for measuring the compressive strength of an engineering road surface, which relates to the technical field of road surface detection and includes a bearing component, a squeezing component, and a feeding component. The squeezing component is located above the bearing component. The bearing component includes a base, a moving seat is installed on the base, a compressive seat is installed in the moving seat, an embedded groove is arranged on the upper side of the compressive seat, a support bar is fixedly installed in the embedded groove, and sandy soil is installed in the embedded groove to simulate the bottom layer of the real road surface. Through the above technical solution, the environment on the lower side of the real road surface is simulated in the embedded groove, and the forces received by the road surface are also squeezing and bending forces. By setting the base and the sandy soil, when pressure is applied to the upper end of the road surface to be tested, the force received by the road surface to be tested is similar to the real situation.

Description

Technical Field

[0001] The present invention relates to the technical field of road surface detection, and in particular to an engineering road surface compressive strength measuring device. Background Art

[0002] The compressive test of engineering road surfaces is an important link in evaluating the structural strength and durability of road surfaces, aiming to ensure that the road surface can withstand the expected traffic loads and environmental factors within the designed service life. The test usually adopts standardized methods, such as using a pressure testing machine to apply gradually increasing pressure to the road surface sample until the sample fails, and recording the maximum pressure value at the time of failure, that is, the compressive strength. This process requires strict control of test conditions, including the preparation, curing of the sample, and the temperature and humidity of the test environment, to ensure the accuracy and repeatability of the test results. The test results are not only used to verify whether the road surface design meets the specification requirements, but also provide a scientific basis for the maintenance and repair of the road surface. Through regular compressive tests, potential problems in the road surface structure can be detected in time, corresponding reinforcement measures can be taken, the service life of the road surface can be extended, and driving safety can be guaranteed. In addition, the compressive test data can also be used to optimize the road surface material ratio and construction process, improve the project quality and economic benefits. In short, the compressive test of engineering road surfaces is a key step to ensure the quality, safety and durability of road projects, and is of great significance for improving the overall performance of traffic infrastructure.

[0003] However, in the prior art, only simple extrusion tests are performed on the samples. In reality, the lower layer of the road surface is often compacted soil or sand, and the pressure on the road surface is converted into bending force. Therefore, it is necessary to simulate the actual force. Summary of the Invention

[0004] In view of the above technical problems, the present invention discloses an engineering road surface compressive strength measuring device, including a bearing assembly, an extrusion assembly, and a feeding assembly. The extrusion assembly is located above the bearing assembly. The bearing assembly includes a base, on which a moving seat is installed. Inside the moving seat, a compressive seat is installed. An embedded groove is provided on the upper side of the compressive seat. Inside the embedded groove, support bars are fixedly installed. Inside the embedded groove, sand is installed to simulate the lowest layer of the real road surface. Through the above technical solution, the environment of the lower side of the real road surface is simulated in the embedded groove, and the force on the road surface is also the force of extrusion and bending. By setting the base and the sand, when pressure is applied to the upper end of the road surface to be tested, the force received by the road surface to be tested is similar to the actual situation.

[0005] Furthermore, a straight slideway is fixedly installed on the base. A slider is slidably installed inside the straight slideway. A rotating shaft is rotatably installed on the slider. The rotating shaft is fixedly connected to the moving seat. A torsion spring is fixedly installed between the slider and the rotating shaft. A long spring is fixedly installed inside the straight slideway and connected to the slider.

[0006] Furthermore, a large notch is set in the middle of the base, the moving seat is located at the edge of the notch for testing, and the moving seat slides onto the notch and the anti-compression seat falls. Through the above technical solution, the bottom of the moving seat contacts the base during the test and is located at the edge of the opening, which is more stable when squeezed. After the test is completed, it can be moved to the notch to put down the anti-compression seat and test the road surface, and it can also be restored to its original state through the torsion spring and the long spring, which greatly improves the degree of automation.

[0007] Furthermore, the extrusion assembly includes a sliding shaft, a motor seat is fixedly mounted on the top of the sliding shaft, a test motor is fixedly mounted on the motor seat, a test disc is fixedly mounted on the rotating shaft of the test motor, a connecting rod is connected to the test disc by a ball joint, a lifting plate is slidably mounted on the sliding shaft, a connecting block is slidably mounted on the lifting plate, the connecting block is ball-jointed with the connecting rod, the connecting rod is eccentrically connected to the test disc, and the connecting rod is eccentrically connected to the lifting plate.

[0008] Furthermore, the upper rotation of the lifting plate is equipped with a lead screw, which cooperates with the connecting block to drive the connecting block to move. Through the above technical solution, the test disc rotates to drive the connecting rod, and the connecting rod drives the lifting plate to move up and down. During the rapid downward movement, the road surface to be tested is squeezed, so that the force it receives is similar to the repeated impact of the real road surface, and the position of the connecting block is adjustable, and the height of the squeezing impact can be adjusted.

[0009] Furthermore, the unloading assembly includes a side plate, a slide rail is installed on the side plate, a unloading motor is fixedly installed on the hand wheel, a first connecting rod is fixedly installed on the rotating shaft of the unloading motor, a second connecting rod is hinged on the first connecting rod, a second sliding shaft is hinged on the second connecting rod, an intermediate plate is fixedly installed on the second sliding shaft, a first sliding shaft and a second sliding shaft are fixedly installed at both ends of the intermediate plate, a material picking rod is fixedly installed on the second sliding shaft, the material picking rod supports the anti-pressure seat and drives the anti-pressure seat to move to the notch of the base.

[0010] Furthermore, the slide rail includes an upper slide and a lower slide, a first arc slide and a second arc slide are arranged between the upper slide and the lower slide, and the first slide shaft switches and slides between the upper slide and the lower slide.

[0011] Furthermore, a first blocking plate is hinged at the connection between the upper slide and the first arc-shaped slide, and the first blocking plate rotates upward and is limited by the side plate when rotating downward.

[0012] Further, a second right baffle is hinged to the upper side of the lower slideway. The lower side of the second baffle contacts the lower side of the lower slideway. The second baffle rotates towards the side close to the bearing assembly and is limited by the bottom of the lower slideway in the reverse direction. A jack is provided at the bottom of the compression-resistant seat, and the jack cooperates with the material-taking rod. Through the above technical solution, when moving in the slide rail, the material-taking rod first moves horizontally and inserts into the jack of the compression-resistant seat, then drives the moving seat to move to the notch of the base. The compression-resistant seat rotates, driving the moving seat to rotate. The compression-resistant seat and the road surface to be tested move downward following the material-taking rod. Then the material-taking rod moves horizontally and retracts. Finally, the material-taking rod rotates and resets, and the moving seat contacts the bottom of the side plate and is pulled out and dropped.

[0013] The beneficial effects of the present invention compared with the prior art are as follows:

[0014] (1) Through the technical solution of the present invention, the environment under the real road surface is simulated in the embedded groove, and the forces received by the road surface are also extrusion and bending forces. By setting the base and sand, when applying pressure to the upper end of the road surface to be tested, the forces received by the road surface to be tested are similar to the real situation.

[0015] (2) Through the technical solution of the present invention, the bottom of the moving seat contacts the base during the detection, is located at the edge of the opening, and is more stable during extrusion. After the detection is completed, it can move to the notch to drop the compression-resistant seat and the road surface to be detected, and can also return to the original state through the torsion spring and the long spring, greatly improving the degree of automation.

[0016] (3) Through the technical solution of the present invention, the test disc rotates to drive the connecting rod, and the connecting rod drives the lifting plate to move up and down. During the rapid downward movement, the road surface to be tested is extruded, so that the force it receives is approximately the repeated impact of the real road surface, and the position of the connecting block is adjustable, and the height of the extrusion impact can be adjusted.

[0017] (4) Through the technical solution of the present invention, when moving in the slide rail, the material-taking rod first moves horizontally and inserts into the jack of the compression-resistant seat, then drives the moving seat to move to the notch of the base. The compression-resistant seat rotates, driving the moving seat to rotate. The compression-resistant seat and the road surface to be tested move downward following the material-taking rod. Then the material-taking rod moves horizontally and retracts. Finally, the material-taking rod rotates and resets, and the moving seat contacts the bottom of the side plate and is pulled out and dropped. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention.

[0019] Figure 2 It is a schematic diagram of a partial structure of an embodiment of the present invention.

[0020] Figure 3 It is Figure 2 an enlarged view of part A in

[0021] Figure 4Schematic diagram of the extrusion assembly according to an embodiment of the present invention.

[0022] Figure 5 Schematic diagram of the blanking assembly according to an embodiment of the present invention Figure 1 。

[0023] Figure 6 Schematic diagram of the blanking assembly according to an embodiment of the present invention Figure 2 。

[0024] Figure 7 Schematic diagram of the blanking assembly according to an embodiment of the present invention Figure 3 。

[0025] Figure 8 Schematic diagram of the blanking assembly according to an embodiment of the present invention Figure 4 。

[0026] Reference numerals in the drawings: 1 - bearing assembly; 2 - extrusion assembly; 3 - blanking assembly; 101 - base; 102 - straight slideway; 103 - slider; 104 - torsion spring; 105 - rotating shaft; 106 - long spring; 107 - moving seat; 108 - compression-resistant seat; 109 - embedded groove; 110 - support bar; 111 - housing; 201 - sliding shaft; 202 - lifting plate; 203 - connecting block; 204 - motor seat; 205 - test motor; 206 - test disc; 207 - connecting rod; 208 - lead screw; 209 - hand wheel; 301 - blanking motor; 302 - first connecting rod; 303 - second connecting rod; 304 - first sliding shaft; 305 - intermediate plate; 306 - vertical plate; 307 - second sliding shaft; 308 - material taking rod; 309 - side plate; 310 - upper slideway; 311 - first partition; 312 - first arc slideway; 313 - lower slideway; 314 - second arc slideway; 315 - opening; 316 - second partition. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figures 1-8As shown in the figure, an engineering road surface compressive strength measuring device includes a bearing assembly 1, a pressing assembly 2, and a feeding assembly 3. The pressing assembly 2 is located above the bearing assembly 1, and the feeding assembly 3 is located on one side of the bearing assembly 1. In this embodiment, the bearing assembly 1 includes a base 101, a moving seat 107 is installed on the base 101, a compressive seat 108 is installed in the moving seat 107, an embedded groove 109 is provided on the upper side of the compressive seat 108, a support bar 110 is fixedly installed in the embedded groove 109, and sandy soil is installed in the embedded groove 109 to simulate the bottom layer of the real road surface. There are two support bars 110. Usually, small pieces of the road surface to be tested are placed on the support bars 110. Through the downward pressing of the pressing assembly 2, the road surface to be tested is squeezed and deformed. Through the above technical solution, the environment on the lower side of the real road surface is simulated in the embedded groove 109, and the forces received by the road surface are also squeezing and bending forces. By setting the base 101 and the sandy soil, when a pressure is applied to the upper end of the road surface to be tested, the force received by the road surface to be tested is similar to the real situation.

[0029] In this embodiment, a straight slideway 102 is fixedly installed on the base 101, a slider 103 is slidably installed in the straight slideway 102, a rotating shaft 105 is rotatably installed on the slider 103, and the rotating shaft 105 is fixedly connected to the moving seat 107. A torsion spring 104 is fixedly installed between the slider 103 and the rotating shaft 105. A long spring 106 is fixedly installed in the straight slideway 102 and connected to the slider 103. A large notch is provided in the middle of the base 101, and the moving seat 107 is located at the edge of the notch for testing. When the moving seat 107 slides to the notch, the compressive seat 108 drops. After the detection is completed, the compressive seat 108 is pushed by the feeding assembly 3, the moving seat 107 follows, the slider 103 slides in the straight slideway 102, and then is located on the notch. At this time, the moving seat 107 will rotate, and the compressive seat 108 and the road surface to be tested will drop. The moving seat 107 can be restored to its original position by the resilience of the torsion spring 104 and the rotating shaft 105. Through the above technical solution, the bottom of the moving seat 107 contacts the base 101 during the detection, is located at the edge of the opening, and is more stable during extrusion. After the detection is completed, it can move to the notch to drop the compressive seat 108 and the test road surface, and at the same time can be restored to its original state through the torsion spring 104 and the long spring 106, greatly improving the degree of automation.

[0030] In this embodiment, the extrusion assembly 2 includes a sliding shaft 201. A motor base 204 is fixedly installed at the top of the sliding shaft 201. A test motor 205 is fixedly installed on the motor base 204. A test disc 206 is fixedly installed on the rotating shaft of the test motor 205. A connecting rod 207 is ball-jointed to the test disc 206. A lifting plate 202 is slidably installed on the sliding shaft 201. A connecting block 203 is slidably installed on the lifting plate 202. The connecting block 203 is ball-jointed to the connecting rod 207. The connecting rod 207 is eccentrically connected to the test disc 206 and the lifting plate 202. Since the connecting rod 207 is eccentrically connected to the test disc 206, the top of the connecting rod 207 moves around the axis of the test disc 206. Since the bottom of the connecting rod 207 is connected to the connecting block 203 and the connecting block 203 is not coaxial with the test disc 206, the lifting plate 202 will be pulled upward and then downward during the movement, making a reciprocating motion.

[0031] In this embodiment, a lead screw 208 is rotatably installed on the lifting plate 202. The lead screw 208 cooperates with the connecting block 203 to drive the connecting block 203 to move. By changing the position of the connecting block 203, when the test disc 206 rotates, the lifting plate 202 can be pulled to different heights, and at the same time, the position where the lifting plate 202 can exert extrusion can also be changed, which can be selected according to different road surfaces. Through the above technical solution, the rotation of the test disc 206 drives the connecting rod 207, and the connecting rod 207 drives the lifting plate 202 to move up and down. During the rapid downward movement, the road surface to be detected is extruded, so that the force it receives is approximately the same as the repeated impact on the real road surface. Moreover, the position of the connecting block 203 is adjustable, and the height of the extrusion impact can be adjusted.

[0032] In this embodiment, the blanking assembly 3 includes a side plate 309. A slide rail is installed on the side plate 309. A blanking motor 301 is fixedly installed on the hand wheel 209. A first connecting rod 302 is fixedly installed inside the rotating shaft of the blanking motor 301. A second connecting rod 303 is hinged on the first connecting rod 302. A second sliding shaft 307 is hinged on the second connecting rod 303. An intermediate plate 305 is fixedly installed on the second sliding shaft 307. A first sliding shaft 304 and a second sliding shaft 307 are fixedly installed at both ends of the intermediate plate 305. A material taking rod 308 is fixedly installed on the second sliding shaft 307. The material taking rod 308 abuts against the compression resistance seat 108 and drives the compression resistance seat 108 to move to the notch of the base 101. The slide rail includes an upper slideway 310 and a lower slideway 313. A first arc slideway 312 and a second arc slideway 314 are arranged between the upper slideway 310 and the lower slideway 313. The first sliding shaft 304 slides and switches between the upper slideway 310 and the lower slideway 313. A first barrier 311 is hinged at the connection of the upper slideway 310 and the first arc slideway 312. The first barrier 311 rotates upward and is limited by the side plate 309 when rotating downward. A second barrier 316 is hinged on the upper side of the lower slideway 313. The lower side of the second barrier 316 contacts the lower side of the lower slideway 313. The second barrier 316 rotates toward the side close to the bearing assembly 1 and is limited by the bottom of the lower slideway 313 when rotating in the reverse direction. A jack is arranged at the bottom of the compression resistance seat 108. The jack cooperates with the material taking rod 308. Through the above technical solution, the material taking rod 308 first moves horizontally and inserts into the jack of the compression resistance seat 108 by moving in the slide rail, and then drives the moving seat 107 to move to the notch of the base 101. The compression resistance seat 108 rotates, driving the moving seat 107 to rotate. The compression resistance seat 108 and the road surface to be measured move downward following the material taking rod 308. Then the material taking rod 308 moves horizontally and retracts. Finally, the material taking rod 308 rotates and resets, and the moving seat 107 contacts the bottom of the side plate 309 and is pulled out and dropped.

[0033] Working principle: Fine sand or other fillers simulating real road surfaces are placed in the embedded groove 109. The road surface to be detected is cut into pieces and placed on the support bar 110, close to the lower side of the filler. Then, manually rotate the handwheel 209. The handwheel 209 drives the lead screw 208 to rotate, and the lead screw 208 drives the connection block 203 to move. Since the connection block 203 is pulled by the connecting rod 207, the entire lifting plate 202 moves up and down. If the lower end of the connecting rod 207 gradually approaches the upper end of the connecting rod 207, the lifting plate 202 descends; if the lower end of the connecting rod 207 moves away from the upper end of the connecting rod 207, the lifting plate 202 ascends. In this way, it can adapt to road surfaces to be detected with different thicknesses. Subsequently, start the test motor 205. The test motor 205 drives the test disc 206 to rotate. The test disc 206 drives the connecting rod 207, the connecting rod 207 drives the connection block 203, and the connection block 203 drives the lifting plate 202 to reciprocate up and down. It is similar to a crank-slider structure. The bottom end of the lifting plate 202 continuously hammers the upper end of the road surface to be detected. The lower end of the road surface to be detected is squeezed by the support bar 110 and the filler and gradually deforms. A pressure sensor is set on the lifting plate 202 to record the pressure. It can be hammered quickly and repeatedly, or a certain force can be applied and maintained. Finally, when the road surface to be detected shows deformation or damage, record the pressure and time.

[0034] After that, start the blanking assembly 3. The blanking motor 301 drives the first connecting rod 302, the first connecting rod 302 drives the second connecting rod 303, the second connecting rod 303 drives the vertical plate 306, the vertical plate 306 drives the middle plate 305 to move, the middle plate 305 drives the first sliding shaft 304 and the second sliding shaft 307, and the second sliding shaft 307 drives the material taking rod 308 to move. The specific movement trajectory is as follows: The initial position is as Figure 5 、 Figure 6, both the first sliding shaft 304 and the second sliding shaft 307 are within the lower slideway 313 and move towards the position closer to the bearing assembly 1. At this time, the material taking rod 308 also moves accordingly and is inserted into the jack of the compression resistance seat 108. Subsequently, it continues to move, pushing the compression resistance seat 108 and the moving seat 107 to move. The slider 103 moves within the straight slideway 102 and pulls the long spring 106 until the moving seat 107 is located above the notch of the base 101. When the first sliding shaft 304 abuts against the end of the lower slideway 313, it starts to rotate. The first sliding shaft 304 enters the first arc-shaped slideway 312, pushes open the first partition plate 311 upwards and enters the upper slideway 310. At this time, the material taking rod 308 also rotates around the second sliding shaft 307, driving the compression resistance seat 108 and the moving seat 107. The moving seat 107 rotates around the rotating shaft 105. Subsequently, the compression resistance seat 108 is separated from the moving seat 107, and the compression resistance seat 108 is stuck on the material taking rod 308. The moving seat 107 resets under the action of the torsion spring 104 and the long spring 106. The road surface to be detected on the compression resistance seat 108 is clamped on the compression resistance seat 108 by a fixture. This is the prior art and is not disclosed. The compression resistance seat 108 follows the material taking rod 308 and moves to the lower side of the bearing assembly 1. Then the first sliding shaft 304 and the second sliding shaft 307 move in the reverse direction. At this time, the first partition plate 311 restricts the first sliding shaft 304 from descending, so it moves horizontally away from the bearing assembly 1 at the same time. Then the second sliding shaft 307 abuts against the second partition plate 316. The second partition plate 316 is restricted by the ground of the lower slideway 313 and cannot move, and starts to rotate. The first sliding shaft 304 enters the second arc-shaped slideway 314. At this time, the material taking rod 308 returns to its original position and drives the compression resistance seat 108. The compression resistance seat 108 contacts the lower surface of the side plate 309 and is ejected. A box for receiving the material taking rod 308 and the road surface to be detected is placed below. Subsequently, the first sliding shaft 304 returns to the lower slideway 313.

[0035] At this time, for the next road surface to be detected, it is fixed in the embedded groove 109 of the compression resistance seat 108 and then placed on the moving seat 107. The bearing assembly 1 and the moving extrusion assembly 2 conduct tests. The bearing assembly 1 and the moving extrusion assembly 2 are located within the housing 111. After that, the feeding assembly 3 is started again. The first sliding shaft 304 will push the second partition plate 316 to rotate into the opening 315 and then pick up the compression resistance seat 108.

[0036] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for measuring the compressive strength of an engineering pavement, characterized in that: The invention comprises a bearing assembly (1), an extrusion assembly (2), and a material discharge assembly (3), wherein the extrusion assembly (2) is located on the upper side of the bearing assembly (1), and the bearing assembly (1) comprises a base (101), a movable seat (107) is mounted on the base (101), a pressure-resistant seat (108) is mounted in the movable seat (107), an embedded groove (109) is arranged on the upper side of the pressure-resistant seat (108), a support bar (110) is fixedly mounted in the embedded groove (109), and sand is filled in the embedded groove (109) to simulate the bottom layer of a real road surface; A straight slideway (102) is fixedly mounted on the base (101), a slider (103) is slidably mounted in the straight slideway (102), a rotating shaft (105) is rotatably mounted on the slider (103), the rotating shaft (105) is fixedly connected to a movable seat (107), a torsion spring (104) is fixedly mounted between the slider (103) and the rotating shaft (105), and a long spring (106) is fixedly mounted in the straight slideway (102) and is connected to the slider (103); A large notch is provided in the middle of the base (101), and the movable seat (107) is located at the edge of the notch for testing. The movable seat (107) slides onto the notch and the pressure-resistant seat (108) falls down.

2. The device for measuring the compressive strength of an engineering pavement according to claim 1, characterized in that: The extrusion assembly (2) comprises a sliding shaft (201), a motor seat (204) is fixedly mounted on the top of the sliding shaft (201), a test motor (205) is fixedly mounted on the motor seat (204), a test disc (206) is fixedly mounted on the rotating shaft of the test motor (205), a ball joint is connected to a connecting rod (207) on the test disc (206), a lifting plate (202) is slidably mounted on the sliding shaft (201), a connecting block (203) is slidably mounted on the lifting plate (202), a ball joint is formed between the connecting block (203) and the connecting rod (207), the connecting rod (207) and the test disc (206) are eccentrically connected, and the connecting rod (207) and the lifting plate (202) are eccentrically connected.

3. The device for measuring the compressive strength of an engineering pavement according to claim 2, characterized in that: The upper rotation of the lifting plate (202) is provided with a lead screw (208), and the lead screw (208) cooperates with the connecting block (203) to drive the connecting block (203) to move.

4. The device for measuring the compressive strength of an engineering pavement according to claim 3, characterized in that: The material unloading assembly (3) comprises a side plate (309), a slide rail is mounted on the side plate (309), a material unloading motor (301) is fixedly mounted on the hand wheel (209), a first connecting rod (302) is fixedly mounted on the rotating shaft of the material unloading motor (301), a second connecting rod (303) is hingedly mounted on the first connecting rod (302), a second sliding shaft (307) is hingedly mounted on the second connecting rod (303), an intermediate plate (305) is fixedly mounted on the second sliding shaft (307), a first sliding shaft (304) and a second sliding shaft (307) are fixedly mounted at both ends of the intermediate plate (305), a material picking rod (308) is fixedly mounted on the second sliding shaft (307), and the material picking rod (308) supports the anti-pressure seat (108) and drives the anti-pressure seat (108) to move to the notch of the base (101).

5. The device for measuring the compressive strength of an engineering pavement according to claim 4, characterized in that: The slide rail comprises an upper slide (310) and a lower slide (313); a first arc-shaped slide (312) and a second arc-shaped slide (314) are arranged between the upper slide (310) and the lower slide (313); and a first slide shaft (304) switches and slides between the upper slide (310) and the lower slide (313).

6. The device for measuring the compressive strength of an engineering pavement according to claim 5, characterized in that: A first blocking plate (311) is hingedly connected at the connection between the upper slideway (310) and the first arc-shaped slideway (312); the first blocking plate (311) rotates upwards and is limited by the side plate (309) when rotating downwards.

7. The device for measuring the compressive strength of an engineering pavement according to claim 6, characterized in that: The upper side of the lower slideway (313) is hinged to the right second blocking plate (316), and the lower side of the second blocking plate (316) contacts the lower side of the lower slideway (313). The second blocking plate (316) rotates toward the side close to the bearing assembly (1) and is limited by the bottom of the lower slideway (313) in the opposite direction. A socket is provided at the bottom of the anti-pressure seat (108), and the socket cooperates with the material picking rod (308).

Images