Device for measuring crack resistance and bearing capacity of cover plate and pedestrian plate

Abstract

The invention discloses a device for measuring crack resistance and bearing capacity of a cover plate and a pedestrian plate, and belongs to the technical field of civil engineering detection equipment.The device comprises a pressure applying assembly, a lifting assembly, two mounting frames, a plurality of cross beams and a supporting seat, the two mounting frames are arranged on the cross beams, and a detection space is defined by the two mounting frames and the cross beams; each of the two mounting frames comprises two vertical columns and two longitudinal beams, and the two vertical columns are arranged on the two longitudinal beams; the pressure applying assembly is arranged at the top of the detection space, the multiple supporting seats are installed on the two longitudinal beams, and the lifting assembly is arranged at the bottom of the stand column. According to the invention, the detection requirements of cover plates or pedestrian plates of various specifications can be met, the application range is expanded, and the use flexibility and universality are improved; the device is convenient to disassemble and assemble, low in manufacturing cost and convenient to transport and carry, and the use convenience is improved; according to the invention, complex working conditions can be simulated, the deviation between the test result and the actual bearing performance is effectively reduced, and the accuracy of the test result is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering detection equipment, and particularly to a device for measuring the crack resistance and bearing capacity of cover plates and pedestrian tread plates. Background Art

[0002] In railway bridge and culvert projects, cover plates and pedestrian tread plates are the main load-bearing structures, and their mechanical properties directly affect the safe operation of the line. With the increase of service time, problems such as crack propagation, fracture, and steel bar corrosion will occur in the cover plates and pedestrian tread plates, resulting in a decrease in their bearing capacity and deterioration of crack resistance. In severe cases, it may even cause a collapse accident, threatening the safety of trains and pedestrians. To ensure the structural reliability, it is necessary to detect the crack resistance and bearing capacity of the cover plates and pedestrian tread plates.

[0003] The applicant retrieved and obtained the following prior art. Specifically, the patent with the publication number CN213933384U discloses a device for testing the crack resistance and bearing capacity of cover plates, including a support frame, a pressing component, and a support base; the support frame is a cuboid support frame, and a bearing platform for placing the cover plate is provided on the support frame, and an avoidance hole is provided in the middle of the bearing platform; the support base includes two cross bars and a bidirectional lead screw, the bidirectional lead screw is rotatably installed on the support frame, and the two cross bars are installed on the bidirectional lead screw. By rotating the bidirectional lead screw, the two cross bars are driven to approach or move away from each other, and the two cross bars are located directly above the bearing platform. This utility model improves the versatility of the test device by setting a bearing platform for the cover plate, a pressing component, a bidirectional lead screw, and two cross bars on the support frame, and adjusting the distance between the two cross bars by rotating the bidirectional lead screw to adapt to the test of cover plates of different sizes.

[0004] It can be seen from the above patent that although the device for testing the crack resistance and bearing capacity of cover plates has high versatility, the method of adjusting two cross bars is only applicable to cover plates of different lengths, that is, it can only be adjusted adaptively according to a single dimension of the cover plate, and it is difficult to detect cover plates of different widths or thicknesses, thus limiting the scope of use and reducing the flexibility of use.

[0005] In view of the problems that the existing testing devices for the crack resistance and bearing capacity of cover plates limit the scope of use and reduce the flexibility of use, the patent with the publication number CN115615808A discloses a loading device for testing the bearing capacity and crack resistance of cover plates of multiple specifications, which relates to the technical field of cover plate performance testing devices. The loading device includes a frame with a double-layer truss structure composed of an upper support and a lower support arranged in parallel, and four support columns vertically installed at the four corners of the two layers of supports. A transmission mechanism installed above the upper support and driving the upper support to lift along the support columns, two supports hung on the lower surface of the upper support by means of bolt connection, a sample feeding mechanism with one half lapped on the upper surface of the lower support and the other end extending outward along the length direction of the frame, a hydraulic jacking mechanism arranged directly below the center of the frame, and a cushion block connected to the telescopic top end of the hydraulic jacking mechanism by means of bolt connection. Therefore, the present invention can flexibly meet the loading requirements of cover plates with various thickness specifications and various width specifications, and then conveniently and smoothly test the bearing capacity and crack resistance of cover plates of corresponding specifications.

[0006] As can be seen from the above patent, although the loading device for testing the bearing capacity and crack resistance of cover plates of multiple specifications can flexibly meet the loading requirements of cover plates with various thickness specifications and various width specifications, in the actual use process of cover plates or pedestrian slabs in railway bridge and culvert projects, due to problems such as soft foundations (such as graded gravel layers), foundation pit drainage, and concrete cracks in railway bridge and culvert construction, the cover plates will tilt and be eccentrically loaded after long-term use. In the use process of this loading device and the existing testing devices, the cover plates are supported by rigid rods and the like to make the cover plates placed horizontally, thus unable to truly simulate complex working conditions such as cover plate tilt and eccentric load, resulting in a deviation between the test results and the actual bearing performance (paper data: the error reaches 3% under the Q / CR 2.1—2014 standard). Therefore, it is not only difficult to provide reliable technical support for the safety assessment of railway bridge cover plates, but also reduces the accuracy of the test results. Summary of the Invention

[0007] The main purpose of the present invention is to overcome the defects existing in the prior art, and provide a measuring device with a simple structure, easy to transport, capable of meeting the crack resistance and bearing capacity tests of cover plates and pedestrian slabs of various specifications and sizes under complex working conditions, and improving the accuracy of test results at the same time.

[0008] To achieve the above object, the present invention provides a device for measuring the crack resistance and bearing capacity of a cover plate and a pedestrian step plate, which includes a pressing component, a lifting component, two mounting frames, several cross beams and support seats. The two mounting frames are respectively arranged on the several cross beams at intervals in a limited and movable manner. The two mounting frames and the several cross beams enclose a detection space for placing the cover plate or the pedestrian step plate. The two mounting frames each include two columns and a longitudinal beam. The two columns are respectively arranged on the two longitudinal beams at intervals in a limited and movable manner. At least one of the cross beams passes through the two columns of the two mounting frames;

[0009] The pressing component is arranged at the top of the detection space through the cross beam. The several support seats are located at the bottom of the detection space and are installed on the two longitudinal beams of the two mounting frames in a limited and movable manner. The several support seats are used for supporting and driving the cover plate or the pedestrian step plate to swing relative to the pressing component. The lifting component is arranged at the bottom of the column.

[0010] Preferably, several positioning holes are formed in any one of the longitudinal beams along its own extending direction. The several support seats each include a support, an adjusting rod and several limit pins. The adjusting rod is used for detachably connecting with any one of the positioning holes. The top of the adjusting rod is spherically hinged to the support. Several limit pins are arranged in the support and are used for abutting against the cover plate or the pedestrian step plate.

[0011] Preferably, the adjusting rod is an L-shaped rod. One end of the adjusting rod is detachably connected to the column, and the other end of the adjusting rod is spherically hinged to the support. Two mutually perpendicular baffles are formed on both sides of the support away from the detection space.

[0012] Preferably, the several limit pins each include a movable part, a fixed part and an elastic part. The fixed part is detachably connected to the support. A guide rod for plugging and matching with the movable part is vertically formed on the fixed part. The elastic part is sleeved on the guide rod and is located between the fixed part and the movable part.

[0013] Preferably, several first brackets are arranged on the side wall of any one of the columns. The several first brackets are all used for detachably connecting with the positioning holes.

[0014] Preferably, several limiting holes are formed in any one of the cross beams along its own extending direction. Several second brackets are further arranged on the side wall of any one of the columns. The several second brackets are all used for detachably connecting with the limiting holes.

[0015] Preferably, the lifting component includes several foot pads, and the several foot pads are respectively and correspondingly installed on the bottom surfaces of the several columns.

[0016] Beneficial effects:

[0017] 1. During the use of the device for measuring the crack resistance and load-bearing capacity of the cover plate and the pedestrian step plate of the present invention, the staff can adaptively adjust the size of the detection space according to the actual size of the cover plate or the pedestrian step plate, so as to meet the detection requirements for cover plates or pedestrian step plates of various specifications. This not only expands the scope of use but also improves the flexibility and versatility of use.

[0018] 2. The overall structure of the device for measuring the crack resistance and load-bearing capacity of the cover plate and the pedestrian step plate of the present invention is simply designed, with low manufacturing cost and convenient disassembly and assembly. When transporting, the present invention can be disassembled into several rods (i.e., several cross beams, longitudinal beams, and columns) to reduce space occupation, facilitate transportation and handling, and achieve rapid deployment, significantly improving the convenience of use.

[0019] 3. In the device for measuring the crack resistance and load-bearing capacity of the cover plate and the pedestrian step plate of the present invention, the cover plate or the pedestrian step plate can be supported at multiple points through several support seats, so as to ensure the installation stability of the cover plate or the pedestrian step plate in the detection space, avoid random shaking of the cover plate or the pedestrian step plate during the detection process, which may affect the detection results, and ensure the accuracy of the detection results.

[0020] 4. In the device for measuring the crack resistance and load-bearing capacity of the cover plate and the pedestrian step plate of the present invention, by adjusting several support seats, complex working conditions such as inclination or eccentric loading that occur after long-term use of the cover plate or the pedestrian step plate can be simulated. At this time, the crack resistance and load-bearing capacity are detected through the pressure application component. This can not only effectively reduce the deviation between the test results and the actual load-bearing performance but also provide reliable technical support for the safety assessment of the cover plates of railway bridges and pedestrian walkways, further improving the accuracy of the test results.

[0021] 5. The device for measuring the crack resistance and load-bearing capacity of the cover plate and the pedestrian step plate of the present invention can not only detect the crack resistance and load-bearing capacity of the cover plate or the pedestrian step plate in a horizontal state but also detect the crack resistance and load-bearing capacity of the cover plate or the pedestrian step plate in an inclined or eccentric loading state by adjusting the height positions of several support seats, expanding the detection range and being reliable in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 The structural schematic diagram of the device for measuring the crack resistance and load-bearing capacity of the cover plate and the pedestrian step plate of the present invention from a first perspective;

[0024] Figure 2 It is a schematic structural diagram of the device for measuring the crack resistance and bearing capacity of the cover plate and pedestrian walkway slab in a second perspective according to an embodiment of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the device for measuring the crack resistance and bearing capacity of the cover plate and pedestrian walkway slab in a third perspective according to an embodiment of the present invention;

[0026] Figure 4 It is a schematic structural diagram of the support base in the device for measuring the crack resistance and bearing capacity of the cover plate and pedestrian walkway slab according to an embodiment of the present invention;

[0027] Figure 5 It is a schematic structural diagram of the limit pin in the device for measuring the crack resistance and bearing capacity of the cover plate and pedestrian walkway slab according to an embodiment of the present invention.

[0028] In the figure: 1 - pressure - applying assembly; 2 - lifting assembly; 3 - mounting frame; 4 - cross beam; 5 - support base; 6 - detection space; 7 - column; 8 - longitudinal beam; 9 - positioning hole; 10 - support; 11 - adjusting rod; 12 - limit pin; 13 - baffle; 14 - movable part; 15 - fixed part; 16 - elastic member; 17 - guide rod; 18 - first bracket; 19 - limit hole; 20 - second bracket; 21 - foot pad. Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0031] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they should not be construed as indicating or implying relative importance.

[0033] In addition, in the description of the present application, if terms such as "horizontal" and "vertical" are used, it does not mean that the components are required to be absolutely horizontal or hanging vertically, but they can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0034] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "linked" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0035] Embodiment 1:

[0036] The present invention provides a device for measuring the crack resistance and bearing capacity of a cover plate and a pedestrian step plate.

[0037] In an embodiment of the present invention, the device for measuring the crack resistance and bearing capacity of a cover plate and a pedestrian step plate includes a pressing component 1, a lifting component 2, two mounting frames 3, several cross beams 4 and support seats 5. The two mounting frames 3 are respectively and spaced apart and movably limited on the several cross beams 4. The two mounting frames 3 and the several cross beams 4 enclose a detection space 6 for placing the cover plate or the pedestrian step plate. Each of the two mounting frames 3 includes two columns 7 and a longitudinal beam 8. The two columns 7 are respectively and spaced apart and movably limited on the two longitudinal beams 8. At least one cross beam 4 passes through the two columns 7 of the two mounting frames 3;

[0038] The pressing component 1 is arranged at the top of the detection space 6 through the cross beam 4. Several support seats 5 are located at the bottom of the detection space 6 and are movably limited and installed on the two longitudinal beams 8 of the two mounting frames 3. The several support seats 5 are used to support and drive the cover plate or the pedestrian step plate to swing relative to the pressing component 1. The lifting component 2 is arranged at the bottom of the column 7.

[0039] Specifically, as Figures 1 to 5 shown, in the device for measuring the crack resistance and bearing capacity of the cover plate and the pedestrian step plate of the present invention, since the two mounting frames 3 are respectively arranged at intervals on a plurality of cross beams 4 in a limited and movable manner, the extending direction of the plurality of cross beams 4 is the left-right direction, and the mounting manner of the two mounting frames 3 and the plurality of cross beams 4 in a limited and movable manner can be adopted as sliding clamping, etc., so that the plurality of mounting frames 3 can be limitedly moved along the left-right direction on the plurality of cross beams 4, and the structural design is simple and reasonable; at the same time, since the two mounting frames 3 can enclose a detection space 6 with the plurality of cross beams 4, that is, the staff can place the cover plate or the pedestrian step plate in a plurality of support seats 5 on the two mounting frames 3. At this time, the cover plate or the pedestrian step plate is accommodated in the detection space 6, and the pressure application component 1 at the top of the detection space 6 applies pressure to the cover plate or the pedestrian step plate, so as to complete the detection of the crack resistance and bearing capacity of the cover plate or the pedestrian step plate.

[0040] Furthermore, since the two columns 7 in the mounting frame 3 are respectively arranged at intervals on the two longitudinal beams 8 in a limited and movable manner, the extending direction of the two longitudinal beams 8 is the front-back direction, and a plurality of support seats 5 are arranged on the two longitudinal beams 8 in a limited and movable manner. The mounting manner of the two columns 7 and the plurality of support seats 5 on the longitudinal beams 8 in a limited and movable manner can also be adopted as sliding clamping, so that the two columns 7 and the plurality of support seats 5 can be limitedly moved along the front-back direction on the two longitudinal beams 8, and thereby the staff can adaptively adjust the size of the detection space 6 according to the actual size of the cover plate or the pedestrian step plate, and further can meet the detection requirements for cover plates or pedestrian step plates of various specifications, which not only expands the use range, but also improves the use flexibility and versatility. It should be noted that in the actual production and manufacturing process of the present invention, the staff can respectively insert and cooperate with a plurality of cross beams 4 and longitudinal beams 8 along the left-right and front-back directions with a plurality of mounting holes opened at intervals on the columns 7, so that the plurality of columns 7 can slide relative to the cross beams 4 and the longitudinal beams 8, and can be limited and fixed by means of bolt connection, etc., so as to realize the rapid assembly of the present invention and meet the use requirements of adjusting the detection space 6. The overall structural design is simple, the manufacturing cost is low, and the disassembly and assembly are convenient. When transporting, the present invention can be disassembled into a plurality of rods (i.e., a plurality of cross beams 4, longitudinal beams 8 and columns 7) to reduce the space occupation, facilitate transportation and handling, and realize rapid deployment, significantly improving the use convenience.

[0041] Understandably, after the staff assembles several cross beams 4, longitudinal beams 8 and columns 7, the lifting assembly 2 at the bottom of the column 7 can be used to adjust the lifting of each single column 7 respectively. Since several cross beams 4 and longitudinal beams 8 are inserted through the column 7, the horizontal inclination states of several cross beams 4 and longitudinal beams 8 can be adjusted synchronously. At the same time, detection instruments such as a horizontal bubble level can be used in cooperation with the lifting assembly 2 to level several cross beams 4 and longitudinal beams 8. After several cross beams 4 and longitudinal beams 8 are leveled, the staff adjusts several support seats 5 to preset positions, and places a cover plate or a pedestrian step plate on several support seats 5. The cover plate or the pedestrian step plate is supported at multiple points by several support seats 5, so as to ensure the installation stability of the cover plate or the pedestrian step plate in the detection space 6, prevent the cover plate or the pedestrian step plate from shaking randomly during the detection process and affecting the detection result, and ensure the accuracy of the detection result. Further, since several support seats 5 can drive the cover plate or the pedestrian step plate to swing relative to the pressing assembly 1. For example, several support seats 5 can be installed on the longitudinal beam 8 by means of bolt connection respectively. That is, the staff can adjust the height of the support seat 5 in the up and down direction by screwing the screw rod, and thereby can place the cover plate or the pedestrian step plate obliquely, and then can simulate complex working conditions such as inclination or eccentric load of the cover plate or the pedestrian step plate after long-term use. At this time, the anti-cracking property and bearing capacity of the cover plate or the pedestrian step plate are detected by the pressing assembly 1. This can not only effectively reduce the deviation between the test result and the actual bearing performance, but also provide reliable technical support for the safety assessment of the cover plate of the railway bridge culvert and the pedestrian walkway, and further improve the accuracy of the test result. The actual use results show that in the detection of a culvert cover plate on the Chengdu-Kunming Railway, the present invention successfully reproduced the 12° inclination working condition caused by uneven foundation settlement. The measured actual bearing capacity of the cover plate decreased by 18.7% compared with the horizontal working condition (the deviation from the traditional calculation result reached 4.2%), providing accurate working condition data support for the reinforcement design.

[0042] In addition, it is obvious that during the actual use of the present invention, when the staff does not adjust the support seat 5, the anti-cracking property and bearing capacity of the cover plate or the pedestrian step plate can be detected in the horizontal state at this time; at the same time, the staff can detect the anti-cracking property and bearing capacity of the cover plate or the pedestrian step plate in the inclined or eccentric load state by adjusting the height positions of several support seats 5, expanding the detection range, and especially suitable for the safety assessment of the cover plate or the pedestrian step plate of the bridge and culvert structure in the section with geological hazards.

[0043] In an embodiment, each longitudinal beam 8 is provided with several positioning holes 9 along its own extending direction. Several support seats 5 each include a support 10, an adjusting rod 11 and several limit pins 12. The adjusting rod 11 is used for detachably connecting with any one of the positioning holes 9. The top of the adjusting rod 11 is spherically hinged to the support 10. Several limit pins 12 are arranged in the support 10 and are used for abutting against the cover plate or the pedestrian step plate.

[0044] Specifically, as Figures 2 to 5 shown, since a plurality of positioning holes 9 are formed in any longitudinal beam 8 in the front-rear direction, when the specification sizes of the cover plate or the pedestrian step plate to be detected change, the staff can detach the support base 5 and detachably connect its adjusting rod 11 to the corresponding positioning hole 9 (such as a threaded connection), thereby enabling the precise positioning and installation of the support base 5 in the front-rear direction, ensuring that a plurality of support bases 5 can adapt to and support the cover plate or the pedestrian step plate of the corresponding specification size. Further, when it is necessary to simulate the off-center load condition of the cover plate or the pedestrian step plate, after the cover plate or the pedestrian step plate is placed on the support 10, the staff can rotate the adjusting rods 11 of a plurality of support bases 5 to drive the corresponding supports 10 to move up and down relative to the longitudinal beam 8 in the vertical direction. Since the top of the adjusting rod 11 is spherically hinged to the support 10, the support 10 can be allowed to adaptively deflect relative to the adjusting rod 11, and then the cover plate or the pedestrian step plate can be adjusted to an inclined placement state. At this time, the anti-cracking property and bearing capacity of the cover plate or the pedestrian step plate under the inclined condition can be detected through the pressing assembly 1, and the structural design is simple and reasonable. It should be noted that a damping ring is provided at the hinge joint between the top of the adjusting rod 11 and the support 10 to prevent the support 10 from shaking during the detection process, and at the same time, its adaptive fine adjustment freedom is retained.

[0045] In addition, since the cover plate and the pedestrian step plate usually have anti-slip patterns on their surfaces, in order to improve the installation stability of the cover plate or the pedestrian step plate in the inclined state, a plurality of limit pins 12 are provided in the support 10 of the present invention. By abutting the plurality of limit pins 12 against the anti-slip patterns of the cover plate or the pedestrian step plate, that is, the plurality of limit pins 12 can adapt to the grooves of the anti-slip patterns and be engaged with the grooves, thereby effectively restricting the displacement of the cover plate or the pedestrian step plate in the inclined state and ensuring the stability of the cover plate or the pedestrian step plate during the test.

[0046] In another embodiment, the adjusting rod 11 is an L-shaped rod. One end of the adjusting rod 11 is detachably connected to the column 7, and the other end of the adjusting rod 11 is spherically hinged to the support 10; mutually perpendicular baffles 13 are formed on both sides of the support 10 away from the detection space 6. It can be understood that, as Figures 1 to 5As shown in the figure, by making the adjusting rod 11 into an L-shaped rod and detachably connecting one end of the adjusting rod 11 to the column 7, the detachable connection method can be bolt connection. This facilitates the disassembly, assembly, and replacement of the adjusting rod 11 and the support 10, and is convenient for maintenance. At the same time, when the staff adjusts the installation position of the column 7, since the adjusting rod 11 is detachably connected to the column 7, the installation position of the support 10 can be adjusted synchronously. There is no need for the staff to repeatedly disassemble, assemble, and adjust the adjusting rod 11 on the longitudinal beam 8, which simplifies the operation steps, reduces the labor intensity of the staff, and improves the assembly and detection efficiency of the present invention. Further, since baffles 13 perpendicular to each other are formed on both sides of the support 10 away from the detection space 6, the baffles 13 can stop and limit the cover plate or the pedestrian step plate, preventing the cover plate or the pedestrian step plate from moving during the detection process and falling off from several support seats 5, significantly improving the installation stability of the cover plate or the pedestrian step plate.

[0047] In one embodiment, several limit pins 12 all include a movable part 14, a fixed part 15, and an elastic member 16. The fixed part 15 is detachably connected to the support 10. A guide rod 17 inserted and matched with the movable part 14 is vertically formed on the fixed part 15. The elastic member 16 is sleeved on the guide rod 17 and is located between the fixed part 15 and the movable part 14. Specifically, as Figure 4 and Figure 5 shown, the fixed part 15 can be fixed on the support 10 by means of threaded connection or snap connection. Since the guide rod 17 is vertically formed on the fixed part 15, the movable part 14 can slide up and down along the vertical direction through the insertion and cooperation between the guide rod 17 and the movable part 14, ensuring the linearity of the movement direction of the movable part 14. Further, since the elastic member 16 is sleeved on the guide rod 17 and is located between the fixed part 15 and the movable part 14, the elastic member 16 can be a spring, etc. The spring has the characteristics of compact structure, easy material selection, and large elastic restoring force. Through the elastic member 16, the movable part 14 can adaptively extend into the groove of the anti-slip pattern of the cover plate or the pedestrian step plate, thereby not only improving the positioning accuracy of the cover plate or the pedestrian step plate, but also absorbing the slight vibration energy during the pressing process and providing more dynamic constraint conditions closer to the actual working conditions for the test process.

[0048] In one embodiment, several first brackets 18 are arranged on the side wall of any column 7, and the several first brackets 18 are all used for detachably connecting with the positioning holes 9. Specifically, as Figure 2 and Figure 3 shown, through the several first brackets 18, the structural strength between the column 7 and the longitudinal beam 8 can be significantly improved, ensuring the installation stability between the column 7 and the longitudinal beam 8, and the structural design is simple and reasonable.

[0049] In one embodiment, a plurality of limiting holes 19 are formed in any cross beam 4 along its extending direction, and a plurality of second brackets 20 are further arranged on the side wall of any column 7. The plurality of second brackets 20 are all used for detachably connecting with the limiting holes 19. Specifically, as Figure 2 shown, since a plurality of limiting holes 19 are formed in any cross beam 4 along the left-right direction, the structural strength between the column 7 and the cross beam 4 can be significantly improved through the detachable connection (such as threaded connection, etc.) between the plurality of second brackets 20 and the limiting holes 19, and the installation stability between the column 7 and the cross beam 4 can be ensured.

[0050] In one embodiment, the lifting assembly 2 includes a plurality of foot pads 21, and the plurality of foot pads 21 are respectively and correspondingly installed on the bottom surfaces of the plurality of columns 7. Specifically, as Figures 1 to 3 shown, the plurality of foot pads 21 can be detachably connected with the corresponding columns 7 by means of threaded connection, etc., and the staff can adjust the plurality of foot pads 21 respectively by checking the level bubble instrument used in cooperation, so as to level the cross beam 4 and the longitudinal beam 8, so that the present invention can adapt to different ground conditions and is reliable in use.

[0051] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A device for measuring the crack resistance and bearing capacity of a cover plate and a pedestrian step plate, characterized in that, It includes a pressing component (1), a lifting component (2), two mounting frames (3), several cross beams (4) and supporting seats (5). The two mounting frames (3) are respectively arranged at intervals on the several cross beams (4) in a limited and movable manner. The two mounting frames (3) and the several cross beams (4) enclose a detection space (6) for placing a cover plate or a pedestrian step plate. The two mounting frames (3) each include two vertical columns (7) and a longitudinal beam (8). The two vertical columns (7) are respectively arranged at intervals on the two longitudinal beams (8) in a limited and movable manner. At least one of the cross beams (4) passes through the two vertical columns (7) of the two mounting frames (3). The pressing component (1) is arranged at the top of the detection space (6) through the cross beam (4). The several supporting seats (5) are located at the bottom of the detection space (6) and are mounted on the two longitudinal beams (8) of the two mounting frames (3) in a limited and movable manner. The several supporting seats (5) are used to support and drive the cover plate or the pedestrian step plate to swing relative to the pressing component (1). The lifting component (2) is arranged at the bottom of the vertical column (7).

2. The device for measuring the crack resistance and bearing capacity of the cover plate and the pedestrian step plate according to claim 1, wherein Any one of the longitudinal beams (8) is provided with several positioning holes (9) along its own extending direction. The several supporting seats (5) each include a support (10), an adjusting rod (11) and several limit pins (12). The adjusting rod (11) is used for detachably connecting with any one of the positioning holes (9). The top of the adjusting rod (11) is spherically hinged to the support (10). Several limit pins (12) are arranged in the support (10). The several limit pins (12) are used to abut against the cover plate or the pedestrian step plate.

3. The device for measuring the crack resistance and bearing capacity of the cover plate and the pedestrian step plate according to claim 2, characterized in that, The adjusting rod (11) is an L-shaped rod. One end of the adjusting rod (11) is detachably connected to the vertical column (7), and the other end of the adjusting rod (11) is spherically hinged to the support (10). Two mutually perpendicular baffles (13) are formed on both sides of the support (10) away from the detection space (6).

4. The cover plate and the device for measuring the crack resistance and load-bearing capacity of the pedestrian step plate according to claim 3, characterized in that, The several limit pins (12) each include a movable part (14), a fixed part (15) and an elastic member (16). The fixed part (15) is detachably connected to the support (10). A guide rod (17) inserted and matched with the movable part (14) is vertically formed on the fixed part (15). The elastic member (16) is sleeved on the guide rod (17) and is located between the fixed part (15) and the movable part (14).

5. The cover plate, pedestrian step anti-cracking and bearing capacity measuring device according to claim 2, characterized in that, Several first brackets (18) are arranged on the side wall of any one of the vertical columns (7). The several first brackets (18) are all used for detachably connecting with the positioning holes (9).

6. The cover plate, pedestrian step anti-cracking and load-bearing capacity measuring device according to claim 1, characterized in that, Any one of the cross beams (4) is provided with several limit holes (19) along its own extending direction. Several second brackets (20) are also arranged on the side wall of any one of the vertical columns (7). The several second brackets (20) are all used for detachably connecting with the limit holes (19).

7. The cover plate, the anti-cracking and load-bearing capacity measuring device for the pedestrian step plate according to any one of claims 1-6, characterized in that, The lifting component (2) includes several foot pads (21). The several foot pads (21) are respectively and correspondingly mounted on the bottom surfaces of the several vertical columns (7).

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