Hydraulic engineering concrete quality detection device

Abstract

The invention discloses a water conservancy project concrete quality detection device, and relates to the concrete quality detection technology, the water conservancy project concrete quality detection device comprises a bottom plate, the bottom plate is slidingly provided with two mobile supports, the bottom plate is also provided with a top pressurization mechanism, and the water conservancy project concrete quality detection device also comprises a bending tensile strength detection unit; a pre-pressing plate is vertically installed on the bottom plate in a sliding mode through an elastic supporting part, the pre-pressing plate is located over the movable supports, and two passing openings corresponding to the movable supports are formed in the pre-pressing plate. According to the water conservancy project concrete quality detection device, when a concrete test block is carried, one end of the concrete test block can be moved to abut against the upper end of the pre-pressing plate, then the concrete test block is pushed along the upper end of the pre-pressing plate to move to the position over the two movable supports, and therefore the concrete test block is moved to the position over the two movable supports; the phenomenon that the concrete test block directly collides with the bottom plate due to the heavy weight is avoided, and the carrying process of the concrete test block is simplified.

Description

Technical Field

[0001] The invention relates to a concrete quality detection technology, and in particular to a water conservancy project concrete quality detection device. Background Art

[0002] In water conservancy projects, the quality of concrete not only affects the structural strength of the project, but also is related to the durability of the project, such as impermeability, frost resistance, and resistance to sulfate erosion. Therefore, it is necessary to conduct quality inspection on the concrete of water conservancy projects. The inspection indicators are mainly divided into two categories: one is to inspect the quality of concrete raw materials, including cement, aggregates and admixtures; the other is to inspect the quality of finished concrete products, mainly including concrete flexural tensile resistance, density and impermeability. Among them, flexural tensile resistance is an important inspection indicator of concrete used in water conservancy projects, and is generally tested by a press or a universal testing machine; in the prior art, commonly used flexural tensile inspection devices include double-point loading devices at three-point points and three-point free-support flexural tensile inspection devices. In order to more accurately evaluate the strength and toughness of concrete and reduce the impact of local stress concentration, a four-point loading configuration may also be used.

[0003] For example, the patent with the authorization announcement number CN118209399B and the authorization announcement date July 19, 2024, is named a concrete quality detection device for water conservancy projects, which includes a base, a cone breaking unit and a clamping unit; the cone breaking unit includes an air pump and a cylinder installed on the base, the air pump is connected to the cylinder body of the cylinder through an air pipe, a pressure gauge is installed on the air pipe, and the piston rod of the cylinder extends in the horizontal direction and is installed with a cone; the clamping unit includes a positioning ring and a push seat, the positioning ring is installed on the base, one end of the push seat is slidably embedded in the positioning ring, and the other end of the push seat extends out of the positioning ring, the test block can be slidably inserted in the positioning ring and abut against the push seat, and the cylinder can push the cone-breaking test block away from one end of the push seat; a mounting seat is installed on the piston rod of the cylinder, a flexible first dial plate is installed on the mounting seat, and the motion trajectory of the push seat has a first end point and a second end point. The beneficial effects of this application are: improving the quality detection efficiency of concrete.

[0004] For example, the patent with authorization announcement number CN117451535B and authorization announcement date March 8, 2024, is named a concrete quality detection device for water conservancy projects, including a pressure-applying mechanism, and also including a top pressure mechanism and a bottom support mechanism for applying upper and lower pressure to the concrete test block for detection. The top pressure mechanism is arranged at the upper end of the concrete test block, and a pressure balancing component is arranged in the top pressure mechanism to always ensure balanced downward pressure, and the top pressure mechanism is fixed on the pressure part of the pressure-applying mechanism, and the bottom support mechanism is arranged at the lower end of the concrete test block, and the bottom support mechanism is fixed on the support part of the pressure-applying mechanism. Lateral pressure mechanisms for applying pressure to the concrete test block are symmetrically arranged on both sides of the concrete test block, and the lateral pressure mechanisms are fixedly installed on the pressure-applying mechanism to solve the technical problem that when testing the concrete test block, the uneven force and deformation inside the concrete test block cause offset and affect the test results.

[0005] When conducting compression resistance test on concrete test blocks, it is necessary to manually carry the concrete test blocks to the movable supports of the press. However, there is a distance between the two movable supports. During the manual transportation process, due to the presence of the top pressure device, it is difficult to place the concrete test blocks directly on the two movable supports from above. Usually, the concrete test blocks need to be placed against one of the movable supports and carried and aligned by more than two workers. During this process, the concrete test blocks are prone to collision with the work surface of the press, which will increase the workload of the workers. Summary of the invention

[0006] The purpose of the present invention is to provide a water conservancy project concrete quality detection device to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A concrete quality detection device for a water conservancy project comprises a base plate, two movable supports are slidably mounted on the base plate, a top pressure mechanism is also arranged on the base plate, and also comprises a bending tensile strength detection unit, a pre-stressing plate is vertically slidably mounted on the base plate through an elastic support portion, the pre-stressing plate is located directly above the movable support and two through openings corresponding to the movable support are provided on the pre-stressing plate; when the top pressure mechanism applies downward pressure, the pre-stressing plate first moves downward so that the through opening passes through the movable support and supports a concrete test block through the movable support; when the movable support supports the concrete test block, the top pressure mechanism contacts the concrete test block, and the bending tensile strength of the concrete test block is tested through the bending tensile strength detection unit.

[0009] In the above-mentioned hydraulic engineering concrete quality detection device, the elastic support portion includes an elastic telescopic rod connected between the bottom plate and the pre-compression plate.

[0010] In the above-mentioned concrete quality detection device for water conservancy projects, the top end of the elastic telescopic rod is fixedly connected to the bottom of the pre-compression plate, and the pre-compression plate is in a horizontal state.

[0011] In the above-mentioned concrete quality detection device for water conservancy projects, the top end of the elastic telescopic rod is rotatably connected to the bottom of the pre-compression plate, and the pre-compression plate is in an inclined state.

[0012] In the above-mentioned concrete quality detection device for water conservancy projects, a mounting plate is fixed on the bottom plate, two limit grooves are provided on the mounting plate, and the two movable supports slide relatively in the corresponding limit grooves respectively.

[0013] In the above-mentioned water conservancy project concrete quality detection device, a top support roller is rotatably installed on the top of the movable support.

[0014] In the above-mentioned concrete quality detection device for water conservancy projects, a driving member is installed in the limiting groove, and the driving member is used to drive the movable support to slide in the limiting groove to adjust the distance between the two movable supports.

[0015] The above-mentioned concrete quality inspection device for water conservancy projects, the top pressure mechanism includes two limit columns vertically fixed on the bottom plate, a pressure platform is slidably installed on the two limit columns, and also includes a downward pressure drive unit, which is used to drive the pressure platform to move downward.

[0016] In the above-mentioned concrete quality inspection device for water conservancy projects, a connecting plate is detachably fixed to the bottom of the pressurizing platform, a pressurizing support is fixed to the bottom of the connecting plate, and a pressurizing roller is rotatably mounted on the lower end of the pressurizing support.

[0017] In the above-mentioned concrete quality detection device for water conservancy projects, a docking block is fixed on the side wall of the pre-stressing plate, and a pre-stressing rod is detachably fixed to the bottom of the pressurizing support. The pre-stressing rod and the docking block are correspondingly arranged, and the length of the pre-stressing rod is greater than the thickness of the concrete test block. When the pressurizing support moves downward, the pre-stressing rod first contacts the docking block and pushes the docking block and the pre-stressing plate to move downward.

[0018] In the above technical scheme, the present invention provides a concrete quality detection device for water conservancy projects, including a pre-stressing plate and a through-port. When transporting the concrete test block, one end of the concrete test block can be moved to rest against the upper end of the pre-stressing plate, and then the concrete test block can be pushed along the upper end of the pre-stressing plate to move it to directly above the two movable supports. In this way, the phenomenon of the concrete test block directly colliding with the bottom plate due to its own weight is avoided, and the transportation process of the concrete test block is simplified; when the top pressure mechanism applies pressure downward, the pre-stressing plate first moves downward to allow the through-port to pass through the movable support and support the concrete test block through the movable support, thereby ensuring the normal testing process of the concrete test block. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a water conservancy project concrete quality detection device provided by an embodiment of the present invention.

[0021] Figure 2 A schematic diagram of a partial three-dimensional structure of a water conservancy project concrete quality detection device provided by an embodiment of the present invention.

[0022] Figure 3 A partial cross-sectional view of a water conservancy project concrete quality detection device provided by an embodiment of the present invention.

[0023] Figure 4 A partial cross-sectional view of a hydraulic engineering concrete quality detection device provided in yet another embodiment of the present invention.

[0024] Figure 5 A top view of the structure of a blocking plate, a connecting spring, a contact plate and an elastic trapezoidal block provided in another embodiment of the present invention.

[0025] Figure 6 A schematic diagram of the three-dimensional structure of a hydraulic engineering concrete quality detection device provided in yet another embodiment of the present invention.

[0026] Figure 7 For the present invention Figure 6 A local enlarged view of point X.

[0027] Figure 8 A cross-sectional view of a hydraulic engineering concrete quality detection device provided in yet another embodiment of the present invention.

[0028] Fig. 9 For the present invention Figure 8A partial enlarged view of point Y.

[0029] Description of reference numerals:

[0030] 1. Bottom plate; 2. Movable support; 3. Top pressure mechanism; 31. Limiting column; 32. Connecting plate; 33. Pressure roller; 34. Docking block; 341. Through-hole; 342. Trapezoidal extrusion block; 343. Extrusion rod; 344. Limiting bracket 345. Telescopic positioning shaft; 346. Elastic positioning block; 347. Vertical positioning groove; 348. Horizontal positioning groove; 349. Reset pressure rod; 350. Return block; 351. Elastic follower block; 35. Pre-compression rod; 4. Elastic support part; 41. Elastic telescopic rod; 5. Pre-compression plate; 51. Through-hole; 52. Blocking plate; 53. Connecting spring; 54. Contact plate; 541. Elastic trapezoidal block; 6. Mounting plate; 61. Limiting groove; 62. Top support roller; 63. Driving member. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] like Figure 1-9 As shown, a concrete quality detection device for a water conservancy project provided by an embodiment of the present invention comprises a base plate 1, on which two movable supports 2 are slidably mounted, a top pressurizing mechanism 3 is also arranged on the base plate 1, and also comprises a bending tensile strength detection unit, a pre-stressing plate 5 is vertically slidably mounted on the base plate 1 through an elastic support portion 4, the pre-stressing plate 5 is located directly above the movable support 2 and two through openings 51 corresponding to the movable support 2 are provided on the pre-stressing plate 5; when the top pressurizing mechanism 3 applies downward pressure, the pre-stressing plate 5 first moves downward so that the through opening 51 passes through the movable support 2 and supports the concrete test block through the movable support 2; when the movable support 2 supports the concrete test block, the top pressurizing mechanism 3 contacts the concrete test block, and the bending tensile strength of the concrete test block is tested by the bending tensile strength detection unit.

[0033] Specifically in this embodiment, the water conservancy engineering concrete test block is a square block structure, the two movable supports 2 are relatively arranged on the bottom plate 1, and the two movable supports 2 can only slide relative to each other to adjust the distance between the two movable supports 2, the movable support 2 is mainly used to support the concrete test block for three-point or four-point pressurization, and there is a line contact between the top of the movable support 2 and the concrete test block, which can be achieved through a cylindrical structure; the top pressurizing mechanism 3 is used to perform single-point or multi-point pressurization on the top of the concrete test block, which can be adjusted according to actual conditions; the flexural tensile strength The degree detection unit (not shown in the figure) is used to detect the ultimate failure load and the lower edge fracture position of the concrete test block, etc. The above are all prior arts and are not repeated here. In this embodiment, preferably, the pre-compression plate 5 is a plate-like structure with a thickness ranging from 5 to 10 mm. The middle position of the pre-compression plate 5 is aligned with the middle positions of the two movable supports 2. The top height of the movable support 2 is not greater than the top height of the pre-compression plate 5. The through hole 51 is a square through hole. The width of the through hole 51 is greater than the width of the movable support 2. The size of the through hole 51 is sufficient to pass the movable support 2. The elastic support part 4 mainly It is used to elastically support the pre-compression plate 5 and limit its moving direction so that the pre-compression plate 5 can only move in the vertical direction; in the complete detection process, the pre-compression plate 5 has three stable working states. In the first working state, no concrete test block is placed on the pre-compression plate 5, the pre-compression plate 5 and the elastic support part 4 are in a natural state, and the pre-compression plate 5 is located directly above the movable support 2; in the second working state, the concrete test block is transported to the pre-compression plate 5, and under the action of the gravity of the concrete test block, the pre-compression plate 5 moves downward for a distance and squeezes the elastic support part 4, and then remains stationary; in the third working state, the The top pressure mechanism 3 applies pressure downward, and the pre-pressure plate 5 first contacts with a part of the top pressure mechanism 3 and gradually squeezes the elastic support part 4. The pre-pressure plate 5 moves downward to make the through opening 51 pass through the movable support 2. At this time, the pre-pressure plate 5 moves to the bottom of the top of the movable support 2 and there is a certain distance between the pre-pressure plate 5 and the concrete test block. The concrete test block is supported by the movable support 2. The top pressure mechanism 3 continues to apply pressure downward so that another part of it contacts with the concrete test block, and gradually pressurizes the concrete test block. At this time, the flexural tensile strength of the concrete test block is tested by the flexural tensile strength testing unit.

[0034] In the above embodiment, when the concrete test block is transported, one end of the concrete test block can be moved to lean against one side of the upper end of the pre-compression plate 5, and then the concrete test block can be pushed along the upper end of the pre-compression plate 5 to move it to just above the two movable supports 2. In this way, the concrete test block is avoided from directly colliding with the bottom plate 1 due to its own weight, thereby simplifying the transportation process of the concrete test block. Obviously, the pre-compression plate 5 has two effects. One is that when the pre-compression plate 5 is located just above the movable support 2, it is convenient to transport the concrete test block, and the contact between the pre-compression plate 5 and the concrete test block is elastic contact, thereby avoiding the phenomenon of collision between the concrete test block. The second is that when the pre-compression plate 5 is located just below the movable support 2 (the third working state), it continues to move upward. When pressure is applied to the concrete test block, the middle part of the concrete test block may gradually break, or it may break directly (when the thickness of the concrete test block is small). In either case, fragments may fall out when the concrete test block cracks. The pre-compression plate 5 can concentrate the fallen fragments on the pre-compression plate 5 for easy handling, thereby avoiding splashing of the fragments after falling. Moreover, more importantly, if the middle part of the concrete test block breaks, the fractured part in the middle part of the concrete test block will tilt downward and may fall out between the top pressure mechanism 3 and the movable support 2 and hit the bottom plate 1. At this time, the pre-compression plate 5 has the function of buffering the impact and protecting the detection device; that is, the two relative positions of the pre-compression plate 5 and the movable support 2 respectively have two different functions.

[0035] In another embodiment provided by the present invention, the elastic support part 4 includes an elastic telescopic rod 41 connected between the bottom plate 1 and the pre-stressing plate 5; the top end of the elastic telescopic rod 41 is fixedly connected to the bottom of the pre-stressing plate 5, and the pre-stressing plate 5 is in a horizontal state. When the concrete test block moves onto the pre-stressing plate 5, under the action of the gravity of the concrete test block, the pre-stressing plate 5 moves downward and squeezes the elastic telescopic rod 41 to be compressed; when the top pressure mechanism 3 applies pressure downward, the pre-stressing plate 5 continues to move downward, and at this time the elastic telescopic rod 41 also continues to move downward, and the elastic telescopic rod 41 is further compressed, so as to elastically support the pre-stressing plate 5 and limit its moving direction so that the pre-stressing plate 5 can only move in the vertical direction.

[0036] When carrying the concrete test block, one end of the mobile concrete test block is pressed against one side of the upper end of the pre-stressing plate 5, and then the concrete test block is pushed along the upper end of the pre-stressing plate 5 to move it to the top of the two movable supports 2. In this process, since the concrete test block itself is heavy, it also brings certain difficulties to moving the concrete test block. In another embodiment provided by the present invention, the top end of the elastic telescopic rod 41 is rotatably connected to the bottom of the pre-stressing plate 5, and the initial state of the pre-stressing plate 5 is an inclined state, in which the length of one of the elastic telescopic rods 41 is greater than the length of the other elastic telescopic rod 41, and the height of one side of the pre-stressing plate 5 connected to the longer elastic telescopic rod 41 is greater than the height of one side of the pre-stressing plate 5 connected to the shorter elastic telescopic rod 41 (the inclination direction of the pre-stressing plate 5 at this time is defined as positive inclination). In this way, when carrying the concrete test block, one end of the concrete test block is placed on the higher end of the pre-stressing plate 5 ( The end of the pre-stressing plate 5 close to the shorter elastic telescopic rod 41 is defined as the first end, and the end of the pre-stressing plate 5 close to the longer elastic telescopic rod 41 is defined as the second end). At this time, the pre-stressing plate 5 moves, and the movement of the pre-stressing plate 5 is a combination of downward sliding and deflection. The inclination degree of the pre-stressing plate 5 also changes. However, the inclination direction of the pre-stressing plate 5 will not be reversed due to the increase in the weight of the concrete test block. In other words, the pre-stressing plate 5 is still forwardly tilted (which can be achieved by setting the elastic coefficient of the longer elastic telescopic rod 41). In this way, when one end of the concrete test block is placed on the higher end of the pre-stressing plate 5, the concrete test block can be moved along the inclination direction of the pre-stressing plate 5, which reduces the workload and facilitates the movement of the concrete test block. The concrete test block in this embodiment can not only achieve elastic contact to avoid bumps, but also use the inclination angle of the pre-stressing plate 5 to assist the concrete test block in loading.

[0037] In another embodiment provided by the present invention, a mounting plate 6 is fixed on the base plate 1, and two limit grooves 61 are provided on the mounting plate 6. The limit groove 61 is preferably arranged in the middle of the upper end surface of the base plate 1, and the two movable supports 2 slide relatively in the corresponding limit grooves 61 respectively, so as to limit the moving direction of the movable support 2 to adapt to different working scenes; a top support roller 62 is rotatably installed on the top of the movable support 2 to realize the line contact between the concrete test block and the top support roller 62. At the same time, when the concrete test block is pressed on the top support roller 62, it is also convenient to adjust the position of the concrete test block; a driving member 63 is installed in the limit groove 61, and the driving member 63 is used to drive the movable support 2 to slide in the limit groove 61 to adjust the distance between the two movable supports 2. The driving member 63 is preferably an electric push rod. Before the test, it is necessary to drive the movable support 2 to slide slightly in the limit groove 61 through the driving member 63, so as to perform a slight adjustment in advance.

[0038] In another embodiment provided by the present invention, the top pressurizing mechanism 3 includes two limit columns 31 vertically fixed on the base plate 1, and a pressurizing platform is slidably installed on the two limit columns 31. The downward pressurizing mechanism also includes a downward pressurizing drive unit (not shown in the figure), and the downward pressurizing drive unit is used to drive the pressurizing platform to move downward. The downward pressurizing drive unit is a prior art, and it is only necessary to drive the pressurizing platform to move downward. There are multiple solutions in the prior art. Optionally, the downward pressurizing drive unit is a hydraulic cylinder. When the concrete test block is installed, the pressurizing platform is driven by the downward pressurizing drive unit to gradually move downward on the limit columns 31 and contact the concrete test block. The downward pressurizing drive unit then continuously and stably pressurizes the concrete test block, thereby performing a flexural tensile strength test on the concrete test block.

[0039] In another embodiment provided by the present invention, a connecting plate 32 is detachably fixed to the bottom of the pressurizing platform, a pressurizing support is fixedly provided at the bottom of the connecting plate 32, a pressurizing roller 33 is rotatably installed at the lower end of the pressurizing support, the pressurizing roller 33 is used to contact with the concrete test block and squeeze its upper end surface, the two pressurizing rollers 33 are arranged relative to each other, and the spacing between the two pressurizing rollers 33 is smaller than the spacing between the two supporting rollers 62, so that the middle position of the concrete test block can be pressurized to cause the middle part of the concrete test block to tilt downward and break.

[0040] In another embodiment provided by the present invention, a plurality of docking blocks 34 are fixed on the side wall of the pre-stressing plate 5, and the docking blocks 34 are preferably four, and the four docking blocks 34 are arranged opposite to each other in pairs. A pre-stressing rod 35 is detachably fixed to the bottom of the pressurizing support, and the pre-stressing rod 35 and the docking blocks 34 are arranged in a corresponding manner. The contact surfaces of the pre-stressing rod 35 and the docking blocks 34 are both horizontal planes. The pre-stressing rod 35 will contact the docking block 34 when it moves vertically downward, and the length of the pre-stressing rod 35 is greater than the thickness of the concrete test block. When the pressurizing support moves downward, the pre-stressing rod 35 first contacts the docking block 34 and pushes the docking block 34 and the pre-stressing plate 5 to move downward, so that the concrete test block falls on the movable support 2 and is lifted up by the movable support 2. When the pre-stressing plate 5 is completely out of contact with the concrete test block, the pressurizing roller 33 starts to contact and apply pressure to the upper end surface of the concrete test block; of course, for the convenience of detection, an additional driving mechanism can also be used to drive the docking block 34 to move downward to push the pre-stressing plate 5 to move.

[0041] Obviously, in the third working state, the concrete test block is arranged horizontally, that is, the pre-stressing plate 5 is first pressurized by the top pressurizing mechanism 3 to become a horizontal state before continuing to pressurize the concrete test block. In this process, the pre-stressing rod 35 first contacts the docking block 34 with a higher horizontal height.

[0042] Obviously, when the concrete test block slides along the inclined direction of the pre-stressing plate 5, it will slide out of the pre-stressing plate 5 if there is no obstacle, and it is difficult to maintain the inclined state on the inclined pre-stressing plate 5. For this reason, this embodiment provides a solution, and a blocking plate 52 is installed on the pre-stressing plate 5. The blocking plate 52 is perpendicular to the pre-stressing plate 5, and the upward inclined end of the blocking plate 52 is installed with a contact plate 54 through a connecting spring 53. When the concrete test block slides downward along the inclined direction of the pre-stressing plate 5, the side wall of the concrete test block will contact the contact plate 54 and make the contact plate 54 slide and squeeze the connecting spring 53. In this way, the concrete test block is elastically blocked to prevent the concrete test block from sliding off the pre-stressing plate 5.

[0043] For further information, see Figure 5-6 , two elastic trapezoidal blocks 541 are arranged at the upward end of the contact plate 54, and the two elastic trapezoidal blocks 541 are arranged opposite to each other, and the shortest distance between the two elastic trapezoidal blocks 541 is equal to the width of the concrete test block. The end of the elastic trapezoidal block 541 close to the concrete test block is an inclined surface, and the inclined surface can push the concrete test block to move to the middle position. When the concrete test block slides along the inclined direction of the pre-compression plate 5, the concrete test block can be guided to slide between the two elastic trapezoidal blocks 541, so that the concrete test block can be centered in the width direction of the pre-compression plate 5 (the centering of the concrete test block in the width direction of the pre-compression plate 5 is defined as width centering, and the centering of the concrete test block in the length direction of the pre-compression plate 5 is defined as length centering). In this way, the accuracy of the test results is ensured. In this embodiment, the inclined pre-compression plate 5 is used to assist the concrete test block to enter between the two elastic trapezoidal blocks 541, and the concrete test block is passively driven to be centered in the width direction of the pre-compression plate 5.

[0044] In summary, the contact plate 54 has two functions. One is to prevent the concrete test block from sliding out of the preloading plate 5 , and the other is to passively drive the concrete test block to the center by utilizing the tilted state of the preloading plate 5 .

[0045] Further, see Figure 6-9When detecting the ultimate breaking load, the pre-stressing plate 5 is also subjected to a certain pressure, which will affect the detection result. For this reason, the present embodiment provides a further solution to solve the above technical problem (taking the pre-stressing plate 5 arranged horizontally as an example); the pre-stressing plate 5 is arranged horizontally, and the pre-stressing plate 5 is a split structure, and the pre-stressing plate 5 is divided into a first plate and a second plate by its midline (parallel to the length direction of the pre-stressing plate 5) as a dividing line, and the two are connected by an elastic connecting member, such as a spring rod, etc., and the movable direction of the elastic connecting member is parallel to the extension direction of the width of the pre-stressing plate 5 (the length direction of the pre-stressing plate 5 is defined as the front-to-back direction, and the width direction of the pre-stressing plate 5 is the left-to-right direction), that is, the first plate and the second plate can be separated horizontally from left to right, and in the initial state, the first plate and the second plate are tightly attached together under the elastic action of the elastic connecting member; in order to assist the horizontal sliding separation of the first plate and the second plate, four elastic support parts 4 are preferably provided, and the front and rear sides of the first plate or the second plate are slidably connected with an elastic support part 4, and the bottom of the elastic support part 4 is fixed on the bottom plate 1; the The docking block 34 is provided with a through opening 341, and a trapezoidal extrusion block 342 is formed at the bottom of the docking block 34. The end of the trapezoidal extrusion block 342 close to the pre-pressing plate 5 is an inclined surface, and the trapezoidal extrusion block 342 is arranged adjacent to the through opening 341. An extrusion rod 343 corresponding to the docking block 34 is also detachably fixed on the bottom plate 1. When the trapezoidal extrusion block 342 moves vertically downward, it will contact the upper end of the extrusion rod 343. There is a certain distance between the upper end of the extrusion rod 343 and the bottom of the trapezoidal extrusion block 342. The distance is When the pre-compression plate 5 moves vertically downward, a mounting groove is provided at the upper end of the extrusion rod 343, the width of the through-hole 341 is greater than the width of the extrusion rod 343, and the width of the mounting groove is greater than the width of the pre-compression rod 35, that is, the extrusion rod 343 can be inserted into the through-hole 341, and the pre-compression rod 35 can also be inserted into the through-hole 341, and when the extrusion rod 343 contacts the pre-compression rod 35, the pre-compression rod 35 will move downward into the mounting groove, and this design is to prevent the extrusion rod 343 from blocking the downward movement of the pre-compression rod 35;The limit bracket 344 is also rotatably installed on the extrusion rod 343 through a torsion spring (not shown in the figure). The limit bracket 344 is composed of a limit shaft and a connecting square plate. The limit shaft is rotatably penetrated on the extrusion rod 343, and the connecting square plate is fixed to the end of the limit shaft away from the pre-stressing plate 5. A telescopic positioning shaft 345 is also slidably installed on the upper end of the limit bracket 344. A limit spring is connected between the telescopic positioning shaft 345 and the limit bracket 344. An elastic positioning block 346 is formed on the telescopic positioning shaft 345. The elastic positioning block 346 is trapezoidal and can undergo a certain elastic deformation. The end of the elastic positioning block 346 close to the pre-stressing plate 5 is an inclined surface. A vertical positioning groove 347 is provided at the end of the docking block 34 away from the pre-stressing plate 5. The vertical cross-section of the vertical positioning groove 347 is arc-shaped, and the ends of the two vertical positioning grooves 347 on the first plate or the second plate that are close to each other pass through the docking block 34, this design is to facilitate the telescopic positioning shaft 345 to leave the vertical positioning groove 347 in the direction of circular movement. The vertical positioning groove 347 is also formed with a horizontal positioning groove 348 on the side close to the pre-pressing plate 5. The horizontal positioning groove 348 and the elastic positioning block 346 are arranged in a corresponding manner to facilitate the positioning of the docking block 34 in the horizontal direction; in addition, a reset pressure rod 349 is detachably fixed to one end of the pre-pressing rod 35 close to the pre-pressing plate 5, and a return block 350 is formed at the lower end of the reset pressure rod 349. A horizontal elastic follower block 351 is formed at one end of the limit rotating shaft close to the pre-pressing plate 5. The elastic follower block 351 is arranged correspondingly to the return block 350, and when the pre-pressing plate 5 is in a stationary state, the reset pressure rod 349 will be directly inserted into it when it moves downward. When the pre-pressing rod 35 drives the reset pressure rod 349 to move downward, the return block 350 will squeeze the elastic follower block 351. ;

[0046] During the downward movement of the pre-stress rod 35, the pre-stress plate 5 has three movement strokes, namely a vertical downward stroke, an oblique separation stroke and a reset stroke; vertical downward stroke: the pre-stress rod 35 moves downward and contacts the docking block 34. At this time, the pre-stress rod 35 pushes the docking block 34 and the pre-stress plate 5 to move vertically downward, and the trapezoidal extrusion block 342 also approaches the extrusion rod 343. This stroke is used to move the pre-stress plate 5 downward and enable the movable support 2 to lift the concrete test block.

[0047] During the oblique separation stroke, the trapezoidal extrusion block 342 gradually contacts the top of the extrusion rod 343. At this time, the trapezoidal extrusion block 342 is squeezed by the extrusion rod 343 and moves in the direction away from the pre-pressing plate 5, which also causes the docking block 34 to move in the direction away from the pre-pressing plate 5. The first plate and the second plate then slide horizontally apart, and the elastic connector is stretched. At the same time, the pre-pressing plate 5 also moves downward. Therefore, the movement of the first plate or the second plate is a combination of the downward movement and the horizontal movement, which causes the first plate or the second plate to move obliquely downward. The first plate is moved. At this time, (taking the first plate as an example) the side wall of the docking block 34 on the first plate begins to contact the telescopic positioning shaft 345 and squeeze the telescopic positioning shaft 345 to slide. At the same time, the limit spring is compressed, and the telescopic positioning shaft 345 slides close to the side wall of the docking block 34 and contacts the vertical positioning groove 347. Under the elastic action of the limit spring, the telescopic positioning shaft 345 enters the vertical positioning groove 347, and the elastic positioning block 346 is squeezed and deformed and stuck in the horizontal positioning groove 348. When the elastic positioning block 346 is stuck in the horizontal positioning groove 348, When the pre-stressing rod 35 is in the middle of the concrete test block, the pre-stressing rod 35 also moves to the top of the through-hole 341 and no longer contacts and presses the docking block 34. In this way, the pre-stressing plate 5 is limited in the vertical and horizontal directions by the telescopic positioning shaft 345 and the elastic positioning block 346, so that when the pre-stressing rod 35 does not apply pressure to the pre-stressing plate 5, the pre-stressing plate 5 can also stop under the concrete test block. At this time, the pre-stressing rod 35 will not be subjected to horizontal and vertical pressure. It should be noted that in this process, the extrusion rod 343 also moves to the bottom of the through-hole 341, and the pre-stressing rod 35 continues to move downward. When the pre-compression rod 35 is inserted into the installation groove, the extrusion rod 343 at this time will not block the downward movement of the pre-compression rod 35; in addition, in this process, the downward movement of the reset pressure rod 349 will drive the return block 350 to contact the elastic follower block 351, and the return block 350 squeezes the elastic follower block 351 to make the limiting shaft tend to rotate, but the rotation trend of the limiting shaft cannot make the telescopic positioning shaft 345 rotate out of the vertical positioning groove 347. Therefore, the movement of the limiting shaft is blocked, and the elastic follower block 351 is squeezed, so that the return block 350 moves to the bottom of the elastic follower block 351.

[0048] During the reset stroke, the reset pressure rod 349 moves upward with the pre-compression rod 35. At this time, the return block 350 contacts and squeezes the driven block 351 to move. At this time, the limit shaft is driven and rotated (the torsion spring also moves accordingly), so that the telescopic positioning shaft 345 and the elastic positioning block 346 rotate out of the vertical positioning groove 347 and the horizontal positioning groove 348. Under the elastic action of the elastic connecting piece and the elastic support part 4, the pre-compression plate 5 is reset accordingly. After the pre-compression plate 5 is reset, under the elastic action of the torsion spring, the limit bracket 344 is also Reset to facilitate the next bending and tensile strength test of the concrete specimen; obviously, through the above scheme, the pre-stressing plate 5 can be limited and positioned in a completely passive manner after moving downward, so as to avoid giving continuous reverse pressure to the pre-stressing rod 35, and reduce the interference items when detecting the ultimate destructive load, which is beneficial to the detection of the bending and tensile strength of the concrete specimen, and can also avoid excessive squeezing of the elastic support part 4. At the same time, the movement and resetting of the pre-stressing plate 5 in the above technical scheme are passive, which can avoid the installation of additional drives on the pre-stressing plate 5.

[0049] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A water conservancy project concrete quality detection device, comprising a bottom plate, two movable supports are slidably mounted on the bottom plate, a top pressure mechanism is also arranged on the bottom plate, and a bending tensile strength detection unit is also included, characterized in that: A pre-pressing plate is vertically slidably mounted on the bottom plate through an elastic support portion, the pre-pressing plate is located directly above the movable support and has two through openings corresponding to the movable support; When the top pressure mechanism applies downward pressure, the pre-pressing plate first moves downward so that the through opening passes through the movable support and supports the concrete test block through the movable support; When the movable support supports the concrete test block, the top pressurizing mechanism contacts the concrete test block, and the flexural tensile strength test of the concrete test block is performed through the flexural tensile strength test unit.

2. A water conservancy project concrete quality detection device according to claim 1, characterized in that: The elastic support part comprises an elastic telescopic rod connected between the bottom plate and the pre-pressing plate.

3. A water conservancy engineering concrete quality detection device according to claim 2, characterized in that: The top end of the elastic telescopic rod is fixedly connected to the bottom of the pre-pressing plate, and the pre-pressing plate is in a horizontal state.

4. A water conservancy engineering concrete quality detection device according to claim 2, characterized in that: The top end of the elastic telescopic rod is rotatably connected to the bottom of the pre-pressing plate, and the pre-pressing plate is in an inclined state.

5. A water conservancy engineering concrete quality detection device according to claim 1, characterized in that: A mounting plate is fixed on the bottom plate, and two limiting grooves are arranged on the mounting plate. The two movable supports slide relatively in the corresponding limiting grooves respectively.

6. A water conservancy engineering concrete quality detection device according to claim 5, characterized in that: A top supporting roller is rotatably mounted on the top of the movable support.

7. A water conservancy engineering concrete quality detection device according to claim 6, characterized in that: A driving member is installed in the limiting groove, and the driving member is used to drive the movable support to slide in the limiting groove to adjust the distance between the two movable supports.

8. A water conservancy engineering concrete quality detection device according to claim 1, characterized in that: The top pressurizing mechanism includes two limit columns vertically fixed on the bottom plate, a pressurizing platform is slidably mounted on the two limit columns, and also includes a downward pressing driving unit, and the downward pressing driving unit is used to drive the pressurizing platform to move downward.

9. A water conservancy engineering concrete quality detection device according to claim 8, characterized in that: A connecting plate is detachably fixed at the bottom of the pressurizing platform, a pressurizing support is fixedly arranged at the bottom of the connecting plate, and a pressurizing roller is rotatably mounted at the lower end of the pressurizing support.

10. A water conservancy engineering concrete quality detection device according to claim 9, characterized in that: A docking block is fixed on the side wall of the pre-stressing plate, and a pre-stressing rod is detachably fixed to the bottom of the pressurizing support. The pre-stressing rod and the docking block are correspondingly arranged, and the length of the pre-stressing rod is greater than the thickness of the concrete test block. When the pressurizing support moves downward, the pre-stressing rod first contacts the docking block and pushes the docking block and the pre-stressing plate to move downward.

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