A roller compacted concrete in-situ shearing test device

Abstract

The application provides a roller compacted concrete in-situ shearing test device, which comprises a jack body, a connecting structure is arranged at the lower end of the jack body, the connecting structure comprises two groups of connecting plates, one group of connecting plates comprises two connecting plates, a center stop plate is arranged between the two connecting plates, a bottom plate body is arranged at the lower end of the center stop plate, a bottom surface is arranged at the lower end of the bottom plate body, two groups of base grooves are symmetrically arranged on the upper surface of the bottom surface, and anti-skid cylinders are arranged in the base grooves. The connecting structure is arranged at the lower end of the jack body, the height difference between the supporting legs and the bottom plate body is changed through the connecting plates arranged at the lower ends of the supporting legs, the center stop plate is arranged between the two connecting plates, the pressure of the jack body on the test block is more uniform, the service life of the structure is greatly prolonged, and the outer wall of the fixing screw is provided with a fixing petal body, the fixing petal body is opened, the fixing protrusion is pierced into the base groove, and the problem of excessively large diameter of the base groove during the opening of the base groove is solved.

Description

Technical Field

[0001] This invention relates to the field of shear resistance of roller-compacted concrete, specifically to an in-situ shear resistance testing device for roller-compacted concrete. Background Technology

[0002] To test the shear resistance of roller-compacted concrete layers, evaluate its compaction quality, and provide parameters for checking the shear stability of the dam body, the concrete around the specimens is usually removed manually and mechanically after a planar arrangement at a certain distance. The removal depth on three sides extends to the interface between the upper and lower concrete layers. For the specimens subjected to shear loads, the removal depth extends to 15cm below the concrete interface to facilitate the installation of jacks. Existing jack equipment requires drilling holes at the installation location during installation, followed by inserting fixing anchors or bolts. However, in actual jack installation, problems often arise such as: inclined drilling, the four corners of the jack not being horizontal, and large drilling holes leading to insecure jack fixation. Therefore, this paper proposes an in-situ shear test device for roller-compacted concrete to address these issues. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: A roller-compacted concrete in-situ shear resistance testing device includes a jack body, a connecting structure at the lower end of the jack body, the connecting structure including two sets of connecting plates, each set of connecting plates including two connecting plates, a central support plate between the two connecting plates, a base plate at the lower end of the central support plate, a bottom surface at the lower end of the base plate, two sets of base grooves symmetrically formed on the upper surface of the bottom surface, and anti-slip cylinders installed inside the base grooves.

[0004] As a preferred embodiment of the present invention, a semi-circular sphere is provided at one end of the central abutment plate near the support leg. An abutment groove is formed on the upper surface of the semi-circular sphere, and the inner wall of the abutment groove contacts the lower outer wall of the support leg. A fixed opening is formed through the outer wall of the central abutment plate at one end away from the semi-circular sphere. A movable groove is formed on one side of the outer wall of the central abutment plate, and a support rod is provided inside the movable groove. A rotating shaft is formed through one end of the support rod, and the center of one side of the outer wall of the rotating shaft contacts the inner wall of the support rod and is rotatably connected.

[0005] As a preferred embodiment of the present invention, a second insertion hole is provided through the upper end of one side outer wall of the connecting plate, and a first insertion rod is provided on the inner wall of the second insertion hole. The outer walls of both ends of the first insertion rod are in contact with the inner wall of the second insertion hole and are rotatably connected. The center of one side outer wall of the first insertion rod is in contact with the inner wall of the first insertion hole and is rotatably connected. A third insertion hole is provided through the lower end of one side outer wall of the connecting plate, and a second insertion rod is provided inside the third insertion hole. The two ends of one side outer wall of the second insertion rod are in contact with the inner wall of the third insertion hole and are rotatably connected.

[0006] As a preferred embodiment of the present invention, a fixing block is provided on one side of the upper surface of the base plate, the lower surface of the fixing block is in contact with the upper surface of the base plate and is welded, a buckle groove is provided through one side of the outer wall of the fixing block, and a fourth insertion hole is symmetrically provided through the two outer walls of the fixing block away from the buckle groove, and the outer wall of the central abutment plate is in contact with the inner wall of the buckle groove and is rotatably connected.

[0007] As a preferred embodiment of the present invention, a set of base grooves includes two parts. A fixing screw is provided inside the anti-slip cylinder. The upper surface of the fixing screw is in contact with the center of the lower surface of the base plate and is fixedly connected. An elastic connecting block is provided at the upper end of the anti-slip cylinder. One side of the lower surface of the elastic connecting block is in contact with the outer wall of the upper surface of the anti-slip cylinder and is fixedly connected. A fixing petal is provided on the side of the lower surface of the elastic connecting block away from the anti-slip cylinder. The upper surface of the fixing petal is in contact with one side of the lower surface of the elastic connecting block and is fixedly connected.

[0008] As a preferred embodiment of the present invention, the anti-slip cylinder is cylindrical in shape, hollow inside and open at both ends. Several movable openings are provided through one side of the outer wall of the anti-slip cylinder. The inner wall of the anti-slip cylinder is in contact with and movably connected to the outer wall of the fixed valve body. The outer wall of the fixed valve body is provided with a fixed protrusion that matches the movable opening. One side of the outer wall of the fixed protrusion is in contact with and fixedly connected to the outer wall of the fixed valve body.

[0009] As a preferred embodiment of the present invention, the outer wall of the fixed protrusion is in contact with the inner wall of the movable opening and is movably connected; the outer wall of the fixed protrusion is in contact with the inner wall of the base groove and is snap-fit ​​connected; the inner wall of the fixed petal body is provided with a threaded groove; the inner wall of the threaded groove is in contact with the outer wall of the fixed screw and is threadedly connected.

[0010] As a preferred embodiment of the present invention, a support leg is provided through the upper surface of the jack body, the outer wall of the support leg is in contact with the inner wall of the jack body and is connected by a snap fastener, and a first insertion hole is provided through one side of the lower outer wall of the support leg.

[0011] As a preferred embodiment of the present invention, the center of the outer wall of one side of the second insertion rod is in contact with the inner wall of the fourth insertion hole and the fixing opening and is rotatably connected. The upper surface of the base plate is provided with a number of fixing grooves on the side away from the fixing block. The inner wall of the fixing groove is in contact with the lower outer wall of the support rod and is snap-fit ​​connected.

[0012] As a preferred embodiment of the present invention, the outer walls at both ends of the rotating shaft are in contact with the inner walls on both sides of the movable groove and are inlaid together, and the outer wall of the support rod is in contact with the inner wall of the movable groove.

[0013] In summary, the present invention has the following main beneficial effects: The device has a connecting structure at the lower end of the jack body. By connecting plates at the lower end of each support leg, the height difference between the support leg and the base plate is changed, thereby offsetting the unevenness of the bottom surface and making the pressure of the jack body on the test block more uniform. At the same time, considering the large pressure of the jack body on the test block, a central abutment plate is set between the two connecting plates. Through the central abutment plate, the abutment groove and the fixed opening, the reaction force generated by the jack body during operation can be transmitted not only through the connecting plate to the base plate, but also through the central abutment plate, which greatly extends the service life of the structure. Meanwhile, a fixing flap is provided on the outer wall of the fixing screw. When the worker screws the fixing screw into the fixing flap, the fixing flap gradually opens under the pressure of the fixing screw, so that the fixing protrusion extends out from the movable opening and inserts into the base groove. While ensuring the fixing effect, it also makes up for the problem of the base groove opening diameter being too large. Attached Figure Description

[0014] Figure 1 This is an isometric view of the entire invention; Figure 2 This is an exploded view of the connection structure of the present invention; Figure 3 This is an isometric view of the central abutment plate structure of the present invention; Figure 4 This is a cross-sectional view of the inside of the anti-slip cylinder of the present invention; Figure 5 This is an isometric view of the anti-slip cylinder of the present invention; Figure 6 for Figure 1 Enlarged view of the structure at point A in the middle.

[0015] Figure Descriptions: 100. Jack body; 111. Support leg; 112. First insertion hole; 200. Connecting structure; 211. Connecting plate; 212. Second insertion hole; 213. First insertion rod; 214. Third insertion hole; 215. Second insertion rod; 221. Central abutment plate; 222. Semi-circular sphere; 2221. Abutment groove; 223. Fixed opening; 224. Movable groove; 225. Support rod; 226. Rotating shaft; 231. Base plate; 232. Fixing block; 233. Snap-fit ​​groove; 234. Fourth insertion hole; 235. Fixing groove; 241. Anti-slip cylinder; 242. Movable opening; 243. Fixing flap; 2431. Elastic connecting block; 244. Fixing protrusion; 245. Threaded groove; 246. Fixing screw; 251. Base groove; 252. Bottom surface. Detailed Implementation

[0016] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0017] Example Please refer to Figures 1-6 A roller-compacted concrete in-situ shear resistance testing device includes a jack body 100. The jack body 100 adopts the existing technology structure and is used to test the test block. A support leg 111 is provided through the upper surface of the jack body 100. The outer wall of the support leg 111 is in contact with the inner wall of the jack body 100 and is connected by a snap-fit. A first insertion hole 112 is provided through one side of the lower end outer wall of the support leg 111. The lower end of the jack body 100 is provided with a connecting structure 200, which includes two sets of connecting plates 211. Each set of connecting plates 211 includes two plates, and a central abutment plate 221 is provided between the two connecting plates 211. A semi-circular sphere 222 is provided at the end of the central abutment plate 221 near the support leg 111. The front of the semi-circular sphere 222 is semi-circular, and the side is rectangular. This is to allow the force of the support leg 111 to be better transmitted to the bottom surface 252. The upper surface of the semi-circular sphere 222 has an abutment groove 2221, and the inner wall of the abutment groove 2221 is flush with the lower part of the support leg 111. The outer walls of the center plate 221 are in contact with each other. A fixed opening 223 is provided through the outer wall of the center plate 221 away from the semi-circular sphere 222. A movable groove 224 is provided on one side of the outer wall of the center plate 221. A support rod 225 is provided inside the movable groove 224. A rotating shaft 226 is provided through one end of the support rod 225. The center of one side of the outer wall of the rotating shaft 226 is in contact with the inner wall of the support rod 225 and is rotatably connected. The outer walls of both ends of the rotating shaft 226 are in contact with the inner walls of both sides of the movable groove 224 and are embedded. The outer wall of the support rod 225 is in contact with the inner wall of the movable groove 224. A second insertion hole 212 is provided through the upper end of one side outer wall of the connecting plate 211. A first insertion rod 213 is provided on the inner wall of the second insertion hole 212. The outer walls of both ends of the first insertion rod 213 are in contact with the inner wall of the second insertion hole 212 and are rotatably connected. The center of one side outer wall of the first insertion rod 213 is in contact with the inner wall of the first insertion hole 212 and is rotatably connected. A third insertion hole 214 is provided through the lower end of one side outer wall of the connecting plate 211. A second insertion rod 215 is provided inside the third insertion hole 214. The two ends of one side outer wall of the second insertion rod 215 are in contact with the inner wall of the third insertion hole 214 and are rotatably connected. A base plate 231 is provided at the lower end of the center abutment plate 221. A fixing block 232 is provided on one side of the upper surface of the base plate 231. The lower surface of the fixing block 232 is in contact with the upper surface of the base plate 231 and is welded. A snap-fit ​​groove 233 is provided through one side of the outer wall of the fixing block 232. A fourth insertion hole 234 is symmetrically provided through the outer walls of the fixing block 232 away from the snap-fit ​​groove 233. The outer wall of the center abutment plate 221 is in contact with the inner wall of the snap-fit ​​groove 233 and is rotatably connected. The center of one side of the outer wall of the second insertion rod 215 is in contact with the inner wall of the fourth insertion hole 234 and the fixing opening 223 and is rotatably connected. Several fixing grooves 235 are provided on the upper surface of the base plate 231 away from the fixing block 232. The inner wall of the fixing groove 235 is in contact with the lower outer wall of the support rod 225 and is snap-fit ​​connected. The lower end of the base plate 231 is provided with a bottom surface 252. Two sets of base grooves 251 are symmetrically formed on the upper surface of the bottom surface 252. Each set of base grooves 251 includes two base grooves. An anti-slip cylinder 241 is installed inside the base groove 251. A fixing screw 246 is installed inside the anti-slip cylinder 241. The upper surface of the fixing screw 246 contacts and is fixedly connected to the center of the lower surface of the base plate 231. An elastic connecting block 2431 is provided at the upper end of the anti-slip cylinder 241. One outer wall of the lower surface of the elastic connecting block 2431 contacts and is fixedly connected to the outer wall of the upper surface of the anti-slip cylinder 241. A fixing petal 243 is provided on the lower surface of the elastic connecting block 2431 away from the anti-slip cylinder 241. The upper surface of the fixing petal 243 contacts and is fixedly connected to one side of the lower surface of the elastic connecting block 2431. When the fixed screw 246 compresses the 243, the elastic connecting block 2431 and the fixed petal 243 deform simultaneously. At this time, the fixed protrusion 244 on the outer wall of the fixed petal 243 extends out from the movable opening 242 and inserts into the inner wall of the base groove 251. In this way, even if the worker accidentally opens the hole of the base groove 251 too large, it can still be well fixed inside the base groove 251, effectively reducing the labor intensity of the workers. Moreover, after the in-situ shear test of the test block is completed, the worker removes the fixed screw 246. Under the action of the elastic connecting block 2431, the fixed protrusion 244 will generally pop out of the base groove 251. At this time, the worker can use tools to retrieve it in time. The anti-slip cylinder 241 is inside the base groove 251 and is hollow in the middle, so it will not affect the subsequent construction. The anti-slip cylinder 241 is cylindrical in shape, hollow inside and open at both ends. Several movable openings 242 are provided through one outer wall of the anti-slip cylinder 241. The inner wall of the anti-slip cylinder 241 is in contact with and movably connected to the outer wall of the fixed valve body 243. The outer wall of the fixed valve body 243 is provided with a fixed protrusion 244 that matches the movable opening 242. One outer wall of the fixed protrusion 244 is in contact with and fixedly connected to the outer wall of the fixed valve body 243. The outer wall of the fixed protrusion 244 is in contact with and movably connected to the inner wall of the movable opening 242. The outer wall of the fixed protrusion 244 is in contact with and snap-fit ​​connected to the inner wall of the base groove 251. The inner wall of the fixed valve body 243 is provided with a threaded groove 245. The inner wall of the threaded groove 245 is in contact with and threadedly connected to the outer wall of the fixed screw 246.

[0018] When performing in-situ shear tests on roller-compacted concrete: First, the staff divided the construction site into zones as needed, and prepared a set of test specimens for each selected working condition. Each set of test specimens consisted of 5 to 6 pieces, with 1 spare piece. The design shear area of ​​the test specimens was also set. Next, after arranging the specimens at a certain distance, the concrete around the specimens was removed manually and mechanically. The removal depth on three sides reached the interface between the upper and lower concrete layers. On the specimens subjected to shear loads, the removal depth was reduced to 15cm below the concrete interface to facilitate the installation of jacks. Then, four base grooves 251 were drilled at a certain distance around the specimens in the pre-arranged positions. When the diameter of the base groove 251 is large, the staff uses tools to drive the anti-slip cylinder 241 into the base groove 251. Then, the fixing screw 246 is screwed into the anti-slip cylinder 241, and the lower surface of the base plate 231 is in contact with the upper surface of the bottom surface 252. Then, the staff takes out the two connecting plates 211 and the center abutment plate 221. First, insert one end of the fixing opening 223 of the center abutment 221 into the buckle groove 233 of the fixing block 232. Then, place the other two center abutments 221 on the outer walls of both sides of the fixing block 232. Next, the worker takes out the second insertion rod 215 and passes one end of the second insertion rod 215 through the third insertion hole 214, the fourth insertion hole 234 and the fixing opening 223 in sequence. Then, the worker manually tightens the nuts to fix it by using the characteristics of friction. Next, the staff took out the jack body 100 and placed one end of the support leg 111 of the jack body 100 between the two connecting plates 211 of the connecting plate 211, and ensured that the outer wall of one end of the support leg 111 was in contact with the inner wall of the abutment groove 2221 of the semi-circular sphere 222. Then, one end of the first insertion rod 213 was passed through the second insertion hole 212 and the first insertion hole 112 in sequence and manually tightened with a nut to fix it by utilizing the characteristics of friction. Afterwards, the staff used a level to check whether the output end of the jack body 100 was in a horizontal position and made timely adjustments. After the adjustment was completed, the staff used machinery to fix the first insertion rod 213 and the second insertion rod 215 a second time to ensure their integrity. Next, vertical loads can be applied using the multi-point peak load method, with 5 specimens per group, applied in stages and progressively increasing to the predetermined normal stress. Time control is used, with readings taken every 5 minutes after each stage of load application. When the last stage of load is applied, if two consecutive vertical deformation readings are the same, it indicates stability, and shear (horizontal) loads can be applied. For shear load application, the multi-point peak load method is used to apply 10% of the estimated maximum load. After each load application, a reading is taken immediately, and then taken again after 5 minutes. This loading and reading method is continued until the shear deformation caused by the current load is 1.5 times that of the previous load. At this point, the shear load is applied at 5% until shearing occurs. After shearing, shear loads are continued to be applied while the vertical load remains unchanged. The strength when the deformation continuously increases under the constant shear load is the residual strength. The remaining shear load is gradually reduced to zero, and the rebound deformation is observed. The shear test is then completed. After the shear test, all equipment and instruments are checked and adjusted. The original applied vertical load is maintained. Shear load is applied in stages according to the remaining load, and friction test is carried out along the shear surface using the same procedure. Next, for each group of tests, the stress and corresponding deformation on the shear surface of each specimen under each load level were calculated. Calculate the normal stress σ and shear stress τ acting on the shear plane using the following formulas: ……………………………………………………(1) ……………………………………………………(2) Where: σ – normal stress (MPa) acting on the shear plane; τ – Shear stress (MPa) acting on the shear plane; P – Total vertical load acting on the shear plane, including jack output, equipment weight and test block weight, N; - The horizontal load acting on the shear plane is equal to the total applied horizontal load minus the frictional force of the roller support, in N; F – Shear area, mm²; Plot the τ-σ relationship curve based on shear stress τ and normal stress σ; calculate the peak strength f′, c′ and residual strength f, c values ​​using the Coulomb expression and regression and graphical methods (point group center method); Shear strength is expressed by Coulomb's formula. τ=σf′+c′ τresidual = σfresidual + cresidual In the formula: τ and τresidual represent the shear strength and residual shear strength, respectively, in MPa; f′ and fresidual are the shear friction coefficient and the residual shear friction coefficient, respectively. c′ and cresidual represent shear cohesion and residual shear cohesion, respectively, in MPa; This allows for the completion of in-situ shear tests on concrete.

[0019] The device can change the height difference between the support leg 111 and the base plate 231 by using the connecting plate 211 at the lower end of each support leg 111, thereby offsetting the unevenness of the bottom surface 252 and making the pressure of the jack body 100 on the test block more uniform.

[0020] The working principle of this invention is as follows: When performing in-situ shear tests on roller-compacted concrete: First, the staff divided the construction site into zones as needed, and prepared a set of test specimens for each selected working condition. Each set of test specimens consisted of 5 to 6 pieces, with 1 spare piece. The design shear area of ​​the test specimens was also set. Next, after arranging the specimens at a certain distance, the concrete around the specimens was removed manually and mechanically. The removal depth on three sides reached the interface between the upper and lower concrete layers. On the specimens subjected to shear loads, the removal depth was reduced to 15cm below the concrete interface to facilitate the installation of jacks. Then, four base grooves 251 were drilled at a certain distance around the specimens in the pre-arranged positions. When the diameter of the base groove 251 is large, the staff uses tools to drive the anti-slip cylinder 241 into the base groove 251. Then, the fixing screw 246 is screwed into the anti-slip cylinder 241, and the lower surface of the base plate 231 is in contact with the upper surface of the bottom surface 252. Then, the staff takes out the two connecting plates 211 and the center abutment plate 221. First, insert one end of the fixing opening 223 of the center abutment 221 into the buckle groove 233 of the fixing block 232. Then, place the other two center abutments 221 on the outer walls of both sides of the fixing block 232. Next, the worker takes out the second insertion rod 215 and passes one end of the second insertion rod 215 through the third insertion hole 214, the fourth insertion hole 234 and the fixing opening 223 in sequence. Then, the worker manually tightens the nuts to fix it by using the characteristics of friction. Next, the staff took out the jack body 100 and placed one end of the support leg 111 of the jack body 100 between the two connecting plates 211 of the connecting plate 211, and ensured that the outer wall of one end of the support leg 111 was in contact with the inner wall of the abutment groove 2221 of the semi-circular sphere 222. Then, one end of the first insertion rod 213 was passed through the second insertion hole 212 and the first insertion hole 112 in sequence and manually tightened with a nut to fix it by utilizing the characteristics of friction. Afterwards, the staff used a level to check whether the output end of the jack body 100 was in a horizontal position and made timely adjustments. After the adjustment was completed, the staff used machinery to fix the first insertion rod 213 and the second insertion rod 215 a second time to ensure their integrity. Next, vertical loads can be applied using the multi-point peak load method, with 5 specimens per group, applied in stages and progressively increasing to the predetermined normal stress. Time control is used, with readings taken every 5 minutes after each stage of load application. When the last stage of load is applied, if two consecutive vertical deformation readings are the same, it indicates stability, and shear (horizontal) loads can be applied. For shear load application, the multi-point peak load method is used to apply 10% of the estimated maximum load. After each load application, a reading is taken immediately, and then taken again after 5 minutes. This loading and reading method is continued until the shear deformation caused by the current load is 1.5 times that of the previous load. At this point, the shear load is applied at 5% until shearing occurs. After shearing, shear loads are continued to be applied while the vertical load remains unchanged. The strength when the deformation continuously increases under the constant shear load is the residual strength. The remaining shear load is gradually reduced to zero, and the rebound deformation is observed. The shear test is then completed. After the shear test, all equipment and instruments are checked and adjusted. The original applied vertical load is maintained. Shear load is applied in stages according to the remaining load, and friction test is carried out along the shear surface using the same procedure. Next, for each group of tests, the stress and corresponding deformation on the shear surface of each specimen under each load level were calculated. Calculate the normal stress σ and shear stress τ acting on the shear plane using the following formulas: ……………………………………………………(1) ……………………………………………………(2) Where: σ – normal stress (MPa) acting on the shear plane; τ – Shear stress (MPa) acting on the shear plane; P – Total vertical load acting on the shear plane, including jack output, equipment weight and test block weight, N; - The horizontal load acting on the shear plane is equal to the total applied horizontal load minus the frictional force of the roller support, in N; F – Shear area, mm²; Plot the τ-σ relationship curve based on shear stress τ and normal stress σ; calculate the peak strength f′, c′ and residual strength f, c values ​​using the Coulomb expression and regression and graphical methods (point group center method); Shear strength is expressed by Coulomb's formula. τ=σf′+c′ τresidual = σfresidual + cresidual In the formula: τ and τresidual represent the shear strength and residual shear strength, respectively, in MPa; f′ and fresidual are the shear friction coefficient and the residual shear friction coefficient, respectively. c′ and cresidual represent shear cohesion and residual shear cohesion, respectively, in MPa; This allows for the completion of in-situ shear tests on concrete.

[0021] Embodiments of the present invention have been shown and described, but these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A device for in-situ shear testing of roller-compacted concrete, comprising a jack body (100), characterized in that, The lower end of the jack body (100) is provided with a connecting structure (200), the connecting structure (200) includes two sets of connecting plates (211), one set of the connecting plates (211) includes two, a central abutment plate (221) is provided between the two connecting plates (211), a base plate body (231) is provided at the lower end of the central abutment plate (221), a bottom surface (252) is provided at the lower end of the base plate body (231), two sets of base grooves (251) are symmetrically opened on the upper surface of the bottom surface (252), and an anti-slip cylinder (241) is provided inside the base groove (251). A set of the base grooves (251) includes two anti-slip cylinders (241). A fixing screw (246) is provided inside the anti-slip cylinder (241). The upper surface of the fixing screw (246) is in contact with the center of the lower surface of the base plate (231) and is fixedly connected. An elastic connecting block (2431) is provided at the upper end of the anti-slip cylinder (241). The outer wall of one side of the lower surface of the elastic connecting block (2431) is in contact with the outer wall of the upper surface of the anti-slip cylinder (241) and is fixedly connected. A fixing petal (243) is provided on the side of the lower surface of the elastic connecting block (2431) away from the anti-slip cylinder (241). The upper surface of the fixing petal (243) is in contact with one side of the lower surface of the elastic connecting block (2431) and is fixedly connected. The anti-slip cylinder (241) is cylindrical in shape, hollow inside and open at both ends. Several movable openings (242) are provided through one side of the outer wall of the anti-slip cylinder (241). The inner wall of the anti-slip cylinder (241) is in contact with the outer wall of the fixed valve body (243) and is movably connected. The outer wall of the fixed valve body (243) is provided with a fixed protrusion (244) that matches the movable opening (242). One side of the outer wall of the fixed protrusion (244) is in contact with the outer wall of the fixed valve body (243) and is fixedly connected. The outer wall of the fixed protrusion (244) is in contact with the inner wall of the movable opening (242) and is movably connected. The outer wall of the fixed protrusion (244) is in contact with the inner wall of the base groove (251) and is snap-fit ​​connected. The inner wall of the fixed petal body (243) is provided with a threaded groove (245). The inner wall of the threaded groove (245) is in contact with the outer wall of the fixed screw (246) and is threaded connected.

2. The in-situ shear test device for roller-compacted concrete according to claim 1, characterized in that, A semi-circular sphere (222) is provided at one end of the central abutment plate (221) near the support leg (111). An abutment groove (2221) is provided on the upper surface of the semi-circular sphere (222). The inner wall of the abutment groove (2221) is in contact with the lower outer wall of the support leg (111). A fixed opening (223) is provided through the outer wall of the central abutment plate (221) away from the semi-circular sphere (222). A movable groove (224) is provided on one side of the outer wall of the central abutment plate (221). A support rod (225) is provided inside the movable groove (224). A rotating shaft (226) is provided through one end of the support rod (225). The center of one side of the outer wall of the rotating shaft (226) is in contact with the inner wall of the support rod (225) and is rotatably connected.

3. The in-situ shear test device for roller-compacted concrete according to claim 1, characterized in that, A second insertion hole (212) is provided through the upper end of one side of the connecting plate (211). A first insertion rod (213) is provided on the inner wall of the second insertion hole (212). One end of the outer wall of the first insertion rod (213) is in contact with the inner wall of the second insertion hole (212) and is rotatably connected. The center of one side of the outer wall of the first insertion rod (213) is in contact with the inner wall of the first insertion hole (112) and is rotatably connected. A third insertion hole (214) is provided through the lower end of one side of the connecting plate (211). A second insertion rod (215) is provided inside the third insertion hole (214). One side of the outer wall of the second insertion rod (215) is in contact with the inner wall of the third insertion hole (214) and is rotatably connected.

4. The in-situ shear test device for roller-compacted concrete according to claim 1, characterized in that, A fixing block (232) is provided on one side of the upper surface of the base plate (231). The lower surface of the fixing block (232) is in contact with the upper surface of the base plate (231) and is welded. A snap-fit ​​groove (233) is provided through one side of the outer wall of the fixing block (232). A fourth insertion hole (234) is symmetrically provided through the outer walls of the fixing block (232) away from the snap-fit ​​groove (233). The outer wall of the central abutment plate (221) is in contact with the inner wall of the snap-fit ​​groove (233) and is rotatably connected.

5. The in-situ shear test device for roller-compacted concrete according to claim 1, characterized in that, A support leg (111) is provided through the upper surface of the jack body (100). The outer wall of the support leg (111) is in contact with the inner wall of the jack body (100) and is connected by a snap-fit. A first insertion hole (112) is provided through one side of the lower outer wall of the support leg (111).

6. The in-situ shear test device for roller-compacted concrete according to claim 3, characterized in that, The center of the outer wall of one side of the second insertion rod (215) is in contact with the inner wall of the fourth insertion hole (234) and the fixed opening (223) and is rotatably connected. The upper surface of the base plate (231) away from the fixed block (232) is provided with several fixing grooves (235). The inner wall of the fixing groove (235) is in contact with the lower outer wall of the support rod (225) and is snap-fit ​​connected.

7. The in-situ shear test device for roller-compacted concrete according to claim 2, characterized in that, The outer walls at both ends of the rotating shaft (226) are in contact with the inner walls on both sides of the movable groove (224) and are embedded in each other. The outer wall of the support rod (225) is in contact with the inner wall of the movable groove (224).

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