Pile test piece impact experiment equipment

Abstract

The utility model provides impact experiment equipment for a pile test piece. The impact experiment equipment comprises a rack main body, a lifting device, a drop hammer assembly and an electromagnetic device, a bearing platform capable of adjusting the horizontal position is arranged at the bottom of the rack main body and is used for placing a test piece; the drop hammer assembly is mounted above the test piece through a guide mechanism, a lifting device is mounted on the rack main body, an electromagnetic device is mounted at the lifting end of the lifting device, and the electromagnetic device is used for adsorbing or releasing the drop hammer assembly. According to the utility model, the impact load under the actual working condition can be simulated, and the reciprocating impact test is carried out on the test piece to evaluate the impact resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical property testing equipment for pipe piles, and particularly relates to an impact test equipment for pile specimens. Background Technique

[0002] In the fields of civil and construction engineering, concrete pipe piles have become an indispensable key element in constructing bridge hubs, seaport facilities, skyscrapers, and various industrial and civil infrastructure due to their excellent load-bearing efficiency and long-lasting durability. PHC pipe piles are prestressed high-strength concrete pipe piles, which not only bear huge static and dynamic loads but also face the tests of complex and changing natural environments. Their quality stability is directly related to the safety and service life of the overall project.

[0003] With the continuous progress of construction technology and the continuous expansion of project scale, more stringent requirements are put forward for the performance indicators of concrete pipe piles. Especially during the construction process of using the traditional hammer-driven pile sinking method, the pipe piles need to withstand continuous high-intensity impact loads, which can easily cause microcracks inside the pile body, leading to serious problems such as pile body fracture, pile head damage, and vertical cracks. This not only affects the construction progress but also may pose potential safety hazards.

[0004] Therefore, conducting scientific impact performance tests on concrete pipe piles has become a key link in improving material quality, optimizing engineering design, and ensuring construction quality. Impact tests are an important means to evaluate the impact performance of concrete pipe piles. By simulating the impact loads that may be encountered in actual projects, the concrete solid components are impacted in the laboratory, and the impact resistance of the pipe piles is judged based on their test process, relevant parameters, and failure states. At the same time, the dynamic response, failure mode, and ultimate bearing capacity of the pipe piles are detected, providing a scientific basis for continuous material optimization, engineering design, and construction quality control.

[0005] The prior art discloses a magnetic switch-controlled drop hammer type flexural impact test bench. It is adsorbed on the cantilever through a magnetic switch, and then the center of the impact hammer is manually adjusted to let the impact hammer fall freely. When using this equipment, the manual adjustment of the centroid depends on the experience of the operator, and the data reliability is low. On the other hand, the impact hammer may shift during the free fall process, and the force application point and force application direction will also change accordingly. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the utility model provides an impact test equipment for pile specimens, which can simulate the impact loads under actual working conditions and conduct reciprocating impact tests on the specimens to evaluate their impact resistance.

[0007] The utility model achieves the above technical objectives through the following technical means.

[0008] A pile specimen impact test device, comprising a frame body, a lifting device, a drop hammer assembly and an electromagnetic device; the bottom of the frame body is provided with a bearing platform with adjustable horizontal position, and the bearing platform is used for placing specimens; the drop hammer assembly is installed above the specimen through a guiding mechanism, a lifting device is installed on the frame body, and an electromagnetic device is installed at the lifting end of the lifting device, and the electromagnetic device is used for adsorbing or releasing the drop hammer assembly.

[0009] Furthermore, the lifting device is installed on the top of the frame body through a lifting device mounting seat, two guiding columns are arranged between the lifting device mounting seat and the bottom of the frame body, and the drop hammer assembly can move axially along the guiding columns.

[0010] Furthermore, the two guiding columns are connected into one body through a guiding column fixing plate, the guiding column fixing plate is connected to the lifting device mounting seat through a connecting rod, and the lower ends of the guiding columns are connected to the bottom of the frame body; a guide rope seat is arranged on the guiding column fixing plate, and the lifting end of the lifting device passes through the guide rope seat and is connected to the electromagnetic device.

[0011] Furthermore, a top protection ring is installed at the upper end of the guiding column for limit protection; a buffer structure is arranged at the lower end of the guiding column for buffering the impact of the drop hammer assembly on the frame body.

[0012] Furthermore, the drop hammer assembly includes a hammer body, a clamping plate, a hammer body mounting plate and a guiding seat; the guiding seat passes through the guiding mechanism, and the guiding seat is in non-frictional contact with the guiding mechanism; the hammer body mounting plate is installed on the guiding seat, and the hammer body is installed on the hammer body mounting plate through the clamping plate.

[0013] Furthermore, the bearing platform is placed on the horizontal ground, and a bearing platform limiting rod in contact with the side surface of the bearing platform is installed on the base, and the position of the plane of the bearing platform is adjusted by adjusting the bearing platform limiting rod.

[0014] Furthermore, a leveling seat is installed at the bottom of the frame body for adjusting the level of the frame body.

[0015] Furthermore, an electric control system and sensors are further included, the electric control system is used for controlling the lifting of the lifting device and the start and stop control of the electromagnetic device; the sensors are used for directly or indirectly obtaining the lifting height of the lifting device; the electric control system controls the electromagnetic device to adsorb or release the drop hammer assembly according to the lifting height obtained by the sensors.

[0016] Furthermore, a horizontal detector is further arranged on the frame body for detecting whether the base is in a horizontal state.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. For the pile specimen impact test equipment described in the present utility model, when the electromagnetic device is energized, the hammer device is adsorbed and lifted. After power-off, the magnetic force disappears and the hammer device falls to impact. The fall of the hammer device is not affected by any traction, simulating and restoring the free-fall impact state to the greatest extent, ensuring the accuracy and authenticity of test data.

[0019] 2. For the pile specimen impact test equipment described in the present utility model, the guide seat passes through the guiding mechanism, and there is no frictional contact between the guide seat and the guiding mechanism, which can minimize the frictional resistance suffered by the hammer during descent in the test process to the greatest extent and improve the test accuracy. A protection spring is provided at the bottom of the guide post, and a top protection ring is installed above the guide post to prevent the electric control switch from malfunctioning or human operation errors, and to prevent the hammer device from directly contacting the base or the guide post fixing plate rigidly, causing equipment damage.

[0020] 3. For the pile specimen impact test equipment described in the present utility model, a pile cap is set on the specimen to simulate the actual working condition, and the impact load is evenly dispersed on the specimen, preventing the hammer from directly hitting the specimen and damaging the pile body, resulting in cracking.

[0021] 4. For the pile specimen impact test equipment described in the present utility model, the hammer (with different specifications and weights) can be replaced, and the overall lifting height of the drop hammer device can be adjusted to meet the needs of different impact load tests.

[0022] 5. For the pile specimen impact test equipment described in the present utility model, leveling seats are provided at the bottom of the frame body to ensure the overall verticality of the equipment and the horizontality of the hammer striking surface; by adjusting the bearing platform limit rod, the position of the plane of the bearing platform can be adjusted to ensure that the specimen is located directly below the hammer. During impact, the bearing platform can be limited to prevent it from moving during impact.

[0023] 6. For the pile specimen impact test equipment described in the present utility model, it has a fully automatic control system, which can achieve automatic impact according to the setting, and is equipped with a data acquisition and recording function, directly outputting the test results, which is convenient and fast. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, it is obvious that other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a three-dimensional view of the pile specimen impact test equipment described in the present utility model.

[0026] Figure 2 It is a front view of the pile specimen impact test equipment described in the present utility model.

[0027] Figure 3 Schematic diagram of the drop hammer assembly described in the present utility model.

[0028] Figure 4 Schematic diagram of the installation of the bearing platform limiting rod described in the present utility model.

[0029] In the figure:

[0030] 1 - connecting rod; 2 - frame; 3 - base; 4 - bearing platform limiting rod; 5 - lifting device mounting seat; 6 - wire guiding seat; 7 - pile cap; 8 - specimen; 9 - mounting seat; 10 - leveling seat; 11 - bearing platform; 12 - top protection ring; 13 - guide post fixing plate; 14 - hoist; 15 - electromagnetic device; 16 - drop hammer assembly; 16 - 1 - hammer body; 16 - 2 - clamping plate; 16 - 3 - hammer body mounting plate; 16 - 4 - guide seat; 17 - guide post; 18 - spring; 19 - electric control system. Specific embodiments

[0031] The following details the embodiments of the present utility model. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model and should not be construed as limiting the present utility model.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0033] In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] As Figure 1 and Figure 2 shown, the impact test equipment for pipe pile specimens of the present invention includes a frame body, a lifting device, a drop hammer assembly 16 and an electromagnetic device 15; the frame body includes a frame 2 and a base 3. The frame 2 is spliced by steel sections and is a gantry bracket. The base 3 is installed at the bottom of the gantry bracket. An adjustable horizontal position bearing platform 11 is provided at the bottom of the frame body. The bearing platform 11 is directly placed on the horizontal ground to release the impact force to the ground. The bearing platform 11 is used to place the specimen 8; a leveling seat 10 is installed at the bottom of the frame body. The leveling seat 10 adjusts the height up and down by rotation to ensure the equipment is horizontal after installation.

[0035] As Figure 2 shown, a lifting device mounting seat 5 is provided at the top of the frame 2. A hoist 14 is installed on the lifting device mounting seat 5. The hoist 14 can be of a winch mechanism or a chain hoist type; there are two guide columns 17 between the lifting device mounting seat 5 and the bottom of the frame body. The lifting device mounting seat 5 installs a guide column fixing plate 13 through a connecting rod 1. One end of the guide column 17 is installed on the guide column fixing plate 13; the other end of the guide column 17 is connected to the bottom of the frame body; a rope guide seat 6 is provided on the guide column fixing plate 13. The steel wire rope of the hoist 14 passes through the rope guide seat 6 and is connected to the electromagnetic device 15. The electromagnetic device 15 is used to adsorb or release the drop hammer assembly 16. The drop hammer assembly 16 is installed above the specimen 8 through the guide column 17, and the drop hammer assembly 16 can move axially along the guide column 17. The lifting device mounting seat 5 and the guide column 17 are connected and fixed through the connecting rod 1 to form a stable overall structure.

[0036] A top protection ring 12 is installed at the upper end of the guide column 17, and a buffer structure is provided at the lower end of the guide column 17. The buffer structure is a spring 18, which is used to buffer the impact of the drop hammer assembly 16 on the frame body to protect the equipment from accidental impact.

[0037] As Figure 3As shown, the drop hammer assembly 16 includes a hammer body 16-1, a clamping plate 16-2, a hammer body mounting plate 16-3, and a guide seat 16-4; the guide seat 16-4 passes through the guiding mechanism, and the guide seat 16-4 is in non-frictional contact with the guide post 17; the hammer body mounting plate 16-3 is mounted on the guide seat 16-4, and the hammer body 16-1 is mounted on the hammer body mounting plate 16-3 through the clamping plate 16-2, facilitating the replacement of the hammer body 16-1 with different specifications and weights. The guide seat 16-4 is in non-frictional contact with the guide post 17.

[0038] The electromagnetic device 15 adsorbs and releases the drop hammer assembly 16 using electromagnetism. The electromagnetic device 15 is connected to the hoist 14 through a steel wire rope. When the electromagnetic device 15 descends to contact the top surface of the hammer body 16-1, electricity is applied to generate magnetic force to adsorb the hammer body. After the hoist 14 winds up the rope to lift the hammer body 16-1 to the designated position, the power is cut off to release the magnetic force, and the hammer body 16-1 freely falls to impact the test piece 8. The test piece 8 is mounted on the mounting seat 9, and a pile cap 7 is provided above the test piece 8 to disperse the impact load and prevent the test piece 8 from being directly damaged.

[0039] As Figure 4 As shown, a bearing platform limiting rod 4 that contacts the side surface of the bearing platform 11 is mounted on the base 3. By adjusting the bearing platform limiting rod 4, the position of the plane of the bearing platform 11 can be adjusted. In the embodiment, the bearing platform limiting rods 4 are provided in four directions of the bearing platform 11, which can limit the movement of the bearing platform 11 and facilitate the planar adjustment of the bearing platform 11. Adjusting the bearing platform limiting rod 4 adjusts the horizontal position when the bearing platform 11 is first installed or the accuracy is calibrated; during impact, adjusting the bearing platform limiting rod 4 limits the bearing platform 11 to prevent it from moving during impact.

[0040] It also includes an electric control system 19 and sensors. The electric control system 19 is used to control the lifting of the lifting device; the sensors are used to directly or indirectly obtain the lifting height of the lifting device; the electric control system 19 controls the electromagnetic device 15 to adsorb or release the drop hammer assembly 16 according to the lifting height obtained by the sensors. The electric control system 19 controls the lifting and lowering of the hoist, the energization and power-off of the electromagnetic device, etc. according to preset parameters, realizes an automatic impact test, and is equipped with a data acquisition and recording function to directly output the test results.

[0041] Working process:

[0042] After the equipment is assembled, first, check whether the connections of all components are firm and whether all transmission components are flexible without jamming. Then, turn on the power and start the electric control system to conduct no-load trial operation on key components such as the hoist 14 and the electromagnetic device 15. During the trial operation, pay attention to observing the operating state of the equipment and whether various parameters meet the requirements. Conduct debugging on the drop hammer assembly 16. Lift the drop hammer assembly 16 to a certain height and then release it, and observe whether its descent process along the guide column is stable without shaking. At the same time, check whether the power on and off of the electromagnetic device are accurate and reliable and whether the working states of the protection spring and the top protection ring are normal.

[0043] After the equipment debugging is completed, the impact test on the PHC pipe pile specimen can be carried out:

[0044] Install the specimen 8 on the mounting seat 9 and fix the pile cap 7. Then, after the hoist 14 is controlled by the electric control system 19 to bring the electromagnetic device 15 into contact with the top surface of the hammer body of the drop hammer assembly 16, the electric control system 19 controls the electromagnetic device 15 to be energized to generate magnetic force, and the entire drop hammer assembly 16 is adsorbed through the hammer body 16-1;

[0045] The electric control system 19 controls the hoist 14 to take in the rope, and the electromagnetic device 15 drives the drop hammer assembly 16 to vertically rise along the guide column 17 to the specified position. During the lifting process, pay attention to observing whether the tension state of the steel wire rope and the guiding function of the wire guiding seat are normal.

[0046] When the drop hammer assembly 16 is lifted to the specified height, the electric control system 19 controls the electromagnetic device 15 to cut off the power and release the magnetic force, and the electromagnetic device 15 vertically descends along the guide column 17, and the hammer body 16-1 strikes the specimen pile cap 7 to achieve the impact on the specimen 8;

[0047] Repeat the operation to achieve the reciprocating impact test on the specimen 8. During the impact process, record key parameters such as the impact load and the impact speed.

[0048] It should be understood that although this specification is described according to each embodiment, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0049] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and they are not used to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention should be included within the protection scope of the present invention.

Claims

1. A pile specimen impact test equipment, characterized in that: The invention comprises a frame body, a lifting device, a drop hammer assembly (16) and an electromagnetic device (15); a support platform (11) with an adjustable horizontal position is provided at the bottom of the frame body, and the support platform (11) is used to place a test piece (8); the drop hammer assembly (16) is installed above the test piece (8) through a guide mechanism, the lifting device is installed on the frame body, and the electromagnetic device (15) is installed at the lifting end of the lifting device, and the electromagnetic device (15) is used to absorb or release the drop hammer assembly (16).

2. The pile specimen impact test equipment according to claim 1, characterized in that: The lifting device is installed on the top of the frame body through a lifting device mounting seat (5); two guide columns (17) are arranged between the lifting device mounting seat (5) and the bottom of the frame body; and the drop hammer assembly (16) can move axially along the guide columns (17).

3. The pile specimen impact test equipment according to claim 2, characterized in that: The two guide columns are connected as one body via a guide column fixing plate (13); the guide column fixing plate (13) is connected to a lifting device mounting seat (5) via a connecting rod (1); the lower end of the guide column (17) is connected to the bottom of the frame body; a guide rope seat (6) is provided on the guide column fixing plate (13); the lifting end of the lifting device passes through the guide rope seat (6) and is connected to an electromagnetic device (15).

4. The specimen impact test equipment according to claim 2, characterized in that: A top protection ring (12) is installed on the upper end of the guide column (17) for position limiting protection; a buffer structure is provided on the lower end of the guide column (17) for buffering the impact of the drop hammer assembly (16) on the frame body.

5. The pile specimen impact test equipment according to claim 1, characterized in that: The drop hammer assembly (16) comprises a hammer body (16-1), a clamping plate (16-2), a hammer body mounting plate (16-3) and a guide seat (16-4); the guide seat (16-4) passes through a guide mechanism, and the guide seat (16-4) and the guide mechanism are in frictionless contact; the hammer body mounting plate (16-3) is mounted on the guide seat (16-4), and the hammer body (16-1) is mounted on the hammer body mounting plate (16-3) through the clamping plate (16-2).

6. The pile specimen impact test equipment according to claim 1, characterized in that: The support platform (11) is placed on a horizontal ground, and a support platform limiting rod (4) in contact with the side of the support platform (11) is installed on the base (3). The position of the plane of the support platform (11) can be adjusted by adjusting the support platform limiting rod (4).

7. The pile specimen impact test equipment according to claim 1, characterized in that: A leveling seat (10) is installed at the bottom of the frame body for adjusting the level of the frame body.

8. The pile specimen impact test equipment according to claim 1, characterized in that: It also includes an electric control system (19) and a sensor, wherein the electric control system (19) is used to control the lifting of the lifting device and the start and stop control of the electromagnetic device (15); the sensor is used to directly or indirectly obtain the lifting height of the lifting device; the electric control system (19) controls the electromagnetic device (15) to absorb or release the drop hammer assembly (16) according to the lifting height obtained by the sensor.

9. The pile specimen impact test equipment according to claim 1, characterized in that: It also includes a level detector arranged on the frame body, which is used to detect whether the base is in a horizontal state.

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