Device for testing ultimate bearing capacity of hollow thin-wall pier

Abstract

The utility model relates to the technical field of bridge engineering, in particular to a hollow thin-wall pier ultimate bearing capacity testing device which comprises a base, lifting adjusting assemblies are fixedly arranged on the left side and the right side of the upper end face of the base, a bearing plate is supported on the upper sides of the two lifting adjusting assemblies, a fixing frame is fixedly arranged on the upper side of the bearing plate, and a water tank is placed in the fixing frame. Supporting columns are fixedly arranged at the bottom of the bearing plate, a round loading plate is fixedly connected to the bottoms of the supporting columns, multiple sets of inclined supporting rods are evenly arranged around the supporting columns, and the upper ends and the lower ends of the supporting rods are fixedly connected with the bearing plate and the loading plate respectively. According to the utility model, the load is applied by water instead of an original cement block or metal block, a large hoisting instrument is not needed, the operation is convenient and fast, the time consumption of preparation work at the early stage of the test can be greatly reduced, the test period is shortened, the applied load is easy to adjust, and the operation difficulty of the test is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, and particularly relates to an ultimate bearing capacity test device for a hollow thin-wall pier. Background Technique

[0002] A hollow thin-wall pier refers to a pier form in which a concrete or reinforced concrete pier is designed as a hollow thin-wall structure. This kind of pier is similar to a gravity pier in appearance, but has the characteristics of good structural stiffness and strength, light self-weight, large cross-sectional modulus and small cross-sectional area. Hollow thin-wall piers are mainly used in the construction of high bridges. Compared with gravity solid piers, the masonry work can generally be reduced by 40%-60%. In addition, hollow thin-wall piers can also save masonry materials and reduce the weight.

[0003] Bridge load test is an important means to evaluate the structural performance of a bridge. By simulating the actual load conditions, the bridge is loaded and tested to detect whether the bearing capacity, stiffness, stability, etc. of the bridge meet the design requirements and service safety. In order to evaluate the bearing capacity and stability of a pier under specific conditions, it is necessary to conduct a bearing capacity test on the hollow thin-wall pier. The static load test is a commonly used method for detecting the bearing capacity of piers at present. It mainly measures the deformation of the pier and the load response by applying static loads. The static load test needs to gradually increase the load under appropriate working conditions, and at the same time measure the deformation of the bearing and the load response. Thus, the deformation amount and the load response curve of the pier under different loads can be obtained, and then the bearing capacity and deformation performance of the pier can be calculated.

[0004] However, in the existing pier bearing capacity tests, cement blocks or metal blocks are usually used to apply static loads, which requires the use of large hoisting equipment, and the operation is cumbersome. Moreover, due to the large mass and volume of cement blocks or metal blocks, they are not easy to hoist and move, resulting in a long time-consuming for the preliminary preparation work of the test, a long test period and high costs. In addition, the magnitude of the applied load is not easy to adjust, and the operation convenience is poor. Therefore, there is an urgent need for a new type of bearing capacity test device with simple operation and accurate load control. Content of the Utility Model

[0005] Aiming at the existing deficiencies, the utility model provides an ultimate bearing capacity test device for a hollow thin-wall pier, which solves the problems put forward in the above background technique. The utility model uses water to apply loads to replace the original cement blocks or metal blocks, without the need to use large hoisting equipment, the operation is convenient, the time-consuming for the preliminary preparation work of the test can be greatly reduced, the test period can be shortened, and the magnitude of the applied load is easy to adjust, greatly reducing the operation difficulty of the test.

[0006] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0007] An experimental device for the ultimate bearing capacity of a hollow thin-walled pier, comprising a base. On the upper end surface of the base, lifting and adjusting components are fixedly arranged on both the left and right sides. A bearing plate is supported on the upper sides of the two groups of lifting and adjusting components. A fixed frame is fixedly arranged on the upper side of the bearing plate. A water tank is placed inside the fixed frame. Pillars are fixedly arranged at the bottom of the bearing plate. The bottom of the pillars is fixedly connected to a circular load plate. A plurality of groups of inclined support rods are evenly arranged around the pillars, and the upper and lower ends of the support rods are respectively fixedly connected to the bearing plate and the load plate.

[0008] Further, the lifting and adjusting component includes a jacking card plate, a hydraulic cylinder, a bottom plate, a sliding plate, a threaded lead screw, a base and a driving motor. The base is fixedly arranged at the upper side edge of the base. The threaded lead screw is penetrated and assembled inside the base. A driving motor is installed at the front end of the base, and the output end of the driving motor is fixedly connected to one end of the threaded lead screw. Two groups of sliding plates are sleeved on the threaded lead screw, and the sliding plates are screwed with the threaded lead screw. The upper ends of the two groups of sliding plates are fixedly connected to the bottom plate. Two groups of hydraulic cylinders are symmetrically arranged on the front and rear sides of the bottom plate. A jacking card plate with a right-angle structure is fixedly arranged at the output end of the hydraulic cylinder, and the jacking card plate is clamped at the outer edge of the bearing plate. A limiting and supporting component is also arranged at the middle position of the bottom plate.

[0009] Further, the limiting and supporting component includes a side support arm, a vertical plate and a roller. The vertical plate is vertically fixedly arranged on the bottom plate. L-shaped side support arms are fixedly arranged at the upper side positions of the front and rear end faces of the vertical plate. A plurality of groups of rollers are assembled on the inner sides of the side support arms and the inner side of the vertical plate, and the surfaces of the rollers are in contact and rolling connection with the surface of the fixed frame.

[0010] Further, a bearing platform is arranged on the upper side of the base. The position of the bearing platform corresponds to that of the load plate, and a groove is opened inside the bearing platform.

[0011] Further, a centrifugal water pump is assembled on the top of the water tank. The input end of the centrifugal water pump is hermetically connected to a water inlet pipe. The output end of the centrifugal water pump is hermetically connected to a water outlet pipe, and the water outlet pipe communicates with the inside of the water tank. A flow meter is assembled on the water outlet pipe.

[0012] Further, a fixing plate is fixedly connected to the front side of the bearing plate. A return water pump is installed on the fixing plate. The output end of the return water pump is hermetically connected to a drain pipe. The input end of the return water pump is hermetically connected to a water extraction pipe, and the water extraction pipe is communicated with the inside of the water tank. An electromagnetic valve is assembled on the water extraction pipe.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] 1. The utility model uses water to apply load to replace the original cement blocks or metal blocks, without the need for large hoisting equipment, which is convenient to operate, can greatly reduce the time-consuming of the pre-test preparation work, reduce the test cycle duration, and the applied load size is easy to adjust, greatly reducing the operation difficulty of the test. This device can simulate the stress conditions in actual bridge engineering, accurately test the ultimate bearing capacity of the hollow thin-walled pier, and provide a reliable basis for bridge design and construction.

[0015] 2. The lifting and adjusting assembly provided by the utility model facilitates the adjustment of the heights of the load plate and the water tank for accurate bearing capacity testing. The driving motor can drive the threaded screw rod to rotate, enabling the sliding plate to move along the threaded screw rod, thereby adjusting the position of the hydraulic cylinder, and then driving the load plate and the water tank to move horizontally, so that the load plate moves backward to facilitate the installation and fixation of the pier during the test. The hydraulic cylinder applies pressure to the bearing plate through the jacking plate, and then facilitates driving the load plate to move up and down, facilitating the contact and separation between the load plate and the pier.

[0016] 3. The limiting and supporting assembly provided by the utility model can support and fix the fixed frame from multiple directions, thereby ensuring the stability of the water tank and the fixed frame during the lifting process. The vertical plate, the side support arm and the roller jointly constitute a stable support system, which can ensure the stable movement of the water tank and the fixed frame in the vertical direction and prevent them from tilting and shifting.

[0017] 4. A bearing platform is arranged on the upper side of the base, and the position of the bearing platform corresponds to that of the load plate, and a groove is opened inside the bearing platform. The provided bearing platform facilitates the support and fixation of the pier during the test to realize the support of the pier, and the provided groove plays a role in limiting the pier, which is beneficial to the positioning and installation of the pier.

[0018] 5. An injection system is formed by the centrifugal water pump, the water outlet pipe and the water inlet pipe, which facilitates injecting water from the outside into the water tank, and uses the gravity of the water to simulate the static load on the pier. At the same time, a flow meter is provided to measure the water flow. During the test, by monitoring and recording the readings of the flow meter, the load pressure applied to the pier model can be accurately controlled and adjusted, so as to more realistically simulate the bearing capacity faced by the pier in actual use.

[0019] 6. A fixed plate is fixedly connected to the front side of the bearing plate, and a return water pump is installed on the fixed plate. The output end of the return water pump is hermetically connected to a drain pipe, the input end of the return water pump is hermetically connected to a water suction pipe, and the water suction pipe is communicated with the inside of the water tank, and a solenoid valve is assembled on the water suction pipe. This design constitutes a drainage system through the return water pump, the water suction pipe and the drain pipe, which facilitates draining the water in the water tank after the test. Description of the Drawings

[0020] Figure 1 This is the overall structural schematic diagram of the present utility model.

[0021] Figure 2 This is the structural schematic diagram of another angle of the present utility model.

[0022] Figure 3 This is the front view of the present utility model.

[0023] Figure 4 This is the partial structural schematic diagram of the present utility model.

[0024] Figure 5 This is the partial structural schematic diagram of the present utility model.

[0025] Figure 6 This is the structural schematic diagram of the limit support assembly and the lifting adjustment mechanism in the present utility model.

[0026] In the figure: 1. Water tank; 2. Fixed frame; 3. Limit support assembly; 31. Side support arm; 32. Vertical plate; 33. Roller; 4. Lifting adjustment mechanism; 41. Jacking card plate; 42. Hydraulic cylinder; 43. Bottom plate; 44. Slide plate; 45. Threaded lead screw; 46. Base; 47. Driving motor; 5. Base; 6. Carrying platform; 7. Centrifugal water pump; 8. Load plate; 9. Bearing plate; 10. Outlet pipe; 11. Flowmeter; 12. Inlet pipe; 13. Fixed plate; 14. Return water pump; 15. Drain pipe; 16. Solenoid valve; 17. Suction pipe; 18. Support rod; 19. Support pillar. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0028] Embodiment:

[0029] As Figures 1 to 6As shown in the figure, a test device for the ultimate bearing capacity of a hollow thin-walled pier includes a base 5. On the upper end surface of the base 5, lifting and adjusting components are fixedly installed on both the left and right sides. A bearing plate 9 is supported above the two groups of lifting and adjusting components. A fixed frame 2 is fixedly installed above the bearing plate 9. A water tank 1 is placed inside the fixed frame 2. A support column 19 is fixedly installed at the bottom of the bearing plate 9. The bottom of the support column 19 is fixedly connected to a circular load plate 8. A plurality of groups of inclined support rods 18 are evenly arranged around the support column 19. The upper and lower ends of the support rod 18 are respectively fixedly connected to the bearing plate 9 and the load plate 8. This design solves the problems that in the existing pier bearing capacity tests, cement blocks or metal blocks are usually used to apply static loads, which requires the use of large hoisting equipment, the operation is cumbersome, and due to the large mass and volume of the cement blocks or metal blocks, they are not easy to hoist and move, resulting in a long time-consuming for the pre-test preparation work, a long test period and high costs. In addition, the magnitude of the applied load is not easy to adjust and the operation convenience is poor.

[0030] The lifting and adjusting component includes a jacking clamping plate 41, a hydraulic cylinder 42, a bottom plate 43, a sliding plate 44, a threaded screw rod 45, a base 46 and a driving motor 47. The base 46 is fixedly installed at the upper side edge of the base 5. The threaded screw rod 45 is penetrated and assembled inside the base 46. The driving motor 47 is installed at the front end of the base 46, and the output end of the driving motor 47 is fixedly connected to one end of the threaded screw rod 45. Two groups of sliding plates 44 are sleeved on the threaded screw rod 45, and the sliding plate 44 is screwed with the threaded screw rod 45. The upper ends of the two groups of sliding plates 44 are fixedly connected to the bottom plate 43. Two groups of hydraulic cylinders 42 are symmetrically arranged on the front and rear sides of the bottom plate 43. A jacking clamping plate 41 with a right-angle structure is fixedly installed at the output end of the hydraulic cylinder 42, and the jacking clamping plate 41 is clamped at the outer edge of the bearing plate 9. A limit support component 3 is also arranged at the middle position of the bottom plate 43. By setting the lifting and adjusting component, it is convenient to adjust the heights of the load plate 8 and the water tank 1 for accurate bearing capacity testing. The driving motor 47 can drive the threaded screw rod 45 to rotate, so that the sliding plate 44 can move along the threaded screw rod 45, thereby adjusting the position of the hydraulic cylinder 42, and then driving the load plate 8 and the water tank 1 to move horizontally, so that the load plate 8 moves backward to facilitate the installation and fixation of the pier during the test. The hydraulic cylinder 42 applies pressure to the bearing plate 9 through the jacking clamping plate 41, and then facilitates driving the load plate 8 to move up and down, so as to facilitate the contact and separation between the load plate 8 and the pier.

[0031] The limit support assembly 3 includes side support arms 31, vertical plates 32 and rollers 33. The vertical plates 32 are vertically fixed on the bottom plate 43. L-shaped side support arms 31 are fixed at positions on the upper sides of the front and rear end faces of the vertical plates 32. Multiple groups of rollers 33 are assembled on the inner sides of the side support arms 31 and the inner sides of the vertical plates 32, and the surfaces of the rollers 33 are in rolling contact with the surface of the fixed frame 2. By providing the limit support assembly 3, the fixed frame 2 can be supported and fixed from multiple directions, thereby ensuring the stability of the water tank 1 and the fixed frame 2 during the lifting process. The vertical plates 32, side support arms 31 and rollers 33 together form a stable support system, which can ensure the stable movement of the water tank 1 and the fixed frame 2 in the vertical direction and prevent them from tilting and shifting.

[0032] A bearing platform 6 is provided on the upper side of the base 5. The position of the bearing platform 6 corresponds to that of the load plate 8, and a groove is formed inside the bearing platform 6. By providing the bearing platform 6, it is convenient to support and fix the bridge pier during the test, realizing the support of the bridge pier. At the same time, the provided groove plays a role in limiting the bridge pier, which is beneficial to the positioning and installation of the bridge pier.

[0033] A centrifugal water pump 7 is assembled on the top of the water tank 1. The input end of the centrifugal water pump 7 is hermetically connected to a water inlet pipe 12, the output end of the centrifugal water pump 7 is hermetically connected to a water outlet pipe 10, and the water outlet pipe 10 communicates with the inside of the water tank 1. A flow meter 11 is assembled on the water outlet pipe 10. This design forms a water injection system through the centrifugal water pump 7, the water outlet pipe 10 and the water inlet pipe 12, which is convenient to inject water from the outside into the water tank 1, and uses the gravity of the water to simulate the static load on the bridge pier. At the same time, the provided flow meter 11 is used to measure the water flow. During the test, by monitoring and recording the readings of the flow meter 11, the load pressure applied to the bridge pier model can be accurately controlled and adjusted, so as to more realistically simulate the bearing capacity faced by the bridge pier in actual use.

[0034] A fixed plate 13 is fixedly connected to the front side of the bearing plate 9. A return water pump 14 is installed on the fixed plate 13. The output end of the return water pump 14 is hermetically connected to a drain pipe 15, and the input end of the return water pump 14 is hermetically connected to a water suction pipe 17. The water suction pipe 17 communicates with the inside of the water tank 1, and a solenoid valve 16 is assembled on the water suction pipe 17. This design constitutes a drainage system through the return water pump 14, the water suction pipe 17 and the drain pipe 15, which is convenient to drain the water in the water tank 1 after the test.

[0035] Working principle of the test device for the ultimate bearing capacity of a hollow thin-walled pier: First, place the pier model to be tested in the groove of the bearing platform 6 and fix it to ensure its stable placement. Then, adjust the position of the load plate 8 through the lifting and adjusting assembly so that it is aligned with the top of the pier model. During this process, drive the threaded lead screw 45 to rotate through the drive motor 47, causing the slide plate 44 to move along the threaded lead screw 45, thereby adjusting the position of the hydraulic cylinder 42, moving the hydraulic cylinder 42 forward, and then driving the load plate 8 and the water tank 1 forward through the hydraulic cylinder 42 until the load plate 8 is directly above the pier model. Then, control the hydraulic cylinder 42 to drive the load plate 8 downward until the load plate 8 contacts the top of the pier model and the jacking plate 41 separates from the bearing plate 9. Then start the centrifugal water pump 7 and inject water into the water tank 1 through the water inlet pipe 12. As the water level rises, the gravity of the water will apply a static load to the pier model. By observing the flow meter 11, accurately control the amount of water injected into the water tank 1, thereby adjusting the magnitude of the load applied to the pier. During the loading process, the limit support assembly 3 ensures the stability of the water tank 1 and the fixed frame 2, preventing them from shifting or tilting. Monitor the deformation and stress distribution of the pier model under the action of the static load and record the relevant data. When the test is completed, turn off the centrifugal water pump 7 and stop injecting water into the water tank 1. Start the return water pump 14, pump out the water in the water tank 1 through the water extraction pipe 17, and discharge it outside the device through the drain pipe 15. Then move the load plate 8 upward through the lifting and adjusting assembly and first move it backward to separate from the pier model, facilitating the removal of the pier model.

[0036] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is impossible to enumerate all the implementation manners here. Any obvious changes or variations derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A hollow thin-wall bridge pier ultimate bearing capacity test device, comprising a base (5), characterized in that: The upper end surface of the base (5) is fixedly provided with lifting and adjusting components on both sides, and the upper sides of the two groups of lifting and adjusting components support a pressure plate (9). The upper side of the pressure plate (9) is fixedly provided with a fixed frame (2), and a water tank (1) is placed inside the fixed frame (2). The bottom of the pressure plate (9) is fixedly provided with a support column (19), and the bottom of the support column (19) is fixedly connected to a circular load plate (8). A plurality of groups of inclined support rods (18) are evenly arranged around the support column (19), and the upper and lower ends of the support rods (18) are fixedly connected to the pressure plate (9) and the load plate (8), respectively.

2. The ultimate bearing capacity test device for hollow thin-walled bridge piers according to claim 1 is characterized in that: The lifting and adjusting assembly comprises a lifting card plate (41), a hydraulic cylinder (42), a bottom plate (43), a slide plate (44), a threaded screw (45), a base (46) and a driving motor (47), wherein the base (46) is fixedly arranged at the upper edge of the base (5), a threaded screw (45) is installed through the inside of the base (46), a driving motor (47) is installed at the front end of the base (46), and an output end of the driving motor (47) is fixedly connected to one end of the threaded screw (45), and the threaded screw (45) is fixedly connected to the output end of the driving motor (47). 5) is provided with two groups of slide plates (44) on the upper sleeve, and the slide plates (44) are screwed to the threaded screw rod (45), and the upper ends of the two groups of slide plates (44) are fixedly connected to the bottom plate (43), and two groups of hydraulic cylinders (42) are symmetrically arranged on the front and rear sides of the bottom plate (43), and a lifting card plate (41) with a right-angle structure is fixed on the output end of the hydraulic cylinder (42), and the lifting card plate (41) is clamped at the outer edge of the pressure plate (9), and a limited support component (3) is also arranged in the middle position of the bottom plate (43).

3. The ultimate bearing capacity test device for hollow thin-walled bridge piers according to claim 2 is characterized in that: The position-limiting support assembly (3) comprises a side support arm (31), a vertical plate (32) and a roller (33); the vertical plate (32) is vertically fixed on the bottom plate (43); an L-shaped side support arm (31) is fixed on the upper side of both front and rear end surfaces of the vertical plate (32); a plurality of groups of rollers (33) are installed on the inner side of the side support arm (31) and the inner side of the vertical plate (32); and the surface of the roller (33) is in contact with and rollingly connected to the surface of the fixed frame (2).

4. The ultimate bearing capacity test device for hollow thin-walled bridge piers according to claim 1 is characterized by: A bearing platform (6) is arranged on the upper side of the base (5); the position of the bearing platform (6) corresponds to the load plate (8), and a groove is provided inside the bearing platform (6).

5. The ultimate bearing capacity test device for hollow thin-walled bridge piers according to claim 1 is characterized by: A centrifugal water pump (7) is mounted on the top of the water tank (1); an input end of the centrifugal water pump (7) is sealedly connected to a water inlet pipe (12); an output end of the centrifugal water pump (7) is sealedly connected to a water outlet pipe (10); the water outlet pipe (10) is connected to the interior of the water tank (1); and a flow meter (11) is mounted on the water outlet pipe (10).

6. The ultimate bearing capacity test device for hollow thin-walled bridge piers according to claim 5 is characterized by: A fixing plate (13) is fixedly connected to the front side of the pressure plate (9), a return water pump (14) is installed on the fixing plate (13), a drainage pipe (15) is sealedly connected to the output end of the return water pump (14), a pumping pipe (17) is sealedly connected to the input end of the return water pump (14), and the pumping pipe (17) is connected to the inside of the water tank (1), and a solenoid valve (16) is installed on the pumping pipe (17).

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