A pile foundation high strain detection device

Abstract

The utility model discloses a pile foundation high strain detection device, include: base, gantry, winch, steel cable, limiting component and weight, gantry fixedly connected on the base, winch fixedly connected on the gantry top wall, limiting component swing joint is in the vertical direction frame body of gantry, and limiting component is located between the weight and the gantry top wall, and steel cable one end is wound on the winch, and the other end passes through the gantry top wall and limiting component in proper order and is connected with the weight, and steel cable is matched with the clearance of gantry and limiting component respectively, the utility model discloses the mode of setting limiting component between gantry and weight, reaches the purpose that the hoisting height of weight can be accurate control and adjustment, and then through the mode of changing the height of weight to adjust the impact force of weight, and in order to improve the upper limit of weight impact force, the mode of setting screw disc and spring on the rectangle board is adopted, through the elastic force of spring compression and release, indirectly increase the initial speed of weight release, and then reach the purpose of improving the upper limit of weight impact force.

Description

Technical Field

[0001] This utility model relates to the technical field, and in particular to a high strain detection device for pile foundations. Background Technology

[0002] Strain testing is a testing method for determining the vertical compressive bearing capacity and integrity of a single pile. During the test, a heavy hammer is used to impact the top of the pile, and the velocity and force time history curves at the top of the pile are measured. The results are detected by a strain gauge and an accelerometer, and the signals are transmitted to a pile driving analyzer for analysis using wave theory.

[0003] Existing high-strain pile foundation testing methods typically involve using a crane to directly lift a hammer and then release it to impact the top of the pile. This method has the following problems: First, the hammer sways significantly during the lifting and release process. In such cases, it is usually necessary to lift the hammer and let it stand still until it stabilizes before releasing it, or to manually apply external force to help stabilize the hammer. Both methods result in low work efficiency. Second, when it is necessary to increase the impact force, the existing methods are usually to increase the lifting height of the hammer or increase the weight of the hammer itself. The former requires higher equipment support, while replacing the hammer or adding counterweights to the hammer is inefficient.

[0004] In view of this, there is an urgent need for a high-strain detection device for pile foundations to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a high strain detection device for pile foundations that solves the above-mentioned problems.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a high-strain detection device for pile foundations, comprising:

[0007] The system consists of a base, a gantry frame, a winch, a steel cable, a limit assembly, and a counterweight. The gantry frame is fixedly connected to the base, the winch is fixedly connected to the top wall of the gantry frame, and the limit assembly is movably connected to the vertical frame of the gantry frame, with the limit assembly located between the counterweight and the top wall of the gantry frame. One end of the steel cable is wound around the winch, and the other end passes through the top wall of the gantry frame and the limit assembly in sequence before connecting to the counterweight. The steel cable is clearance-fitted with both the gantry frame and the limit assembly.

[0008] Preferably, the vertical frame of the gantry is provided with multiple sets of matching limiting holes.

[0009] Preferably, the limiting component includes a rectangular plate and multiple limiting handles. The side wall of the rectangular plate is provided with a first screw hole that matches the limiting hole. One end of the limiting handle passes through the limiting hole and is threadedly connected to the first screw hole. The limiting handle and the limiting hole are in clearance fit.

[0010] Preferably, a positioning hole is provided in the middle of the rectangular plate, and a positioning cylinder is provided on the top wall of the hammer that can be detachably connected to it. The end of the positioning cylinder away from the hammer is conical.

[0011] Preferably, the diameter of the end of the positioning cylinder furthest from the counterweight is larger than the diameter of the steel cable.

[0012] Preferably, the rectangular plate has multiple threaded recesses on the side wall near the hammer, each threaded recess has a matching threaded disc, and the threaded disc has a spring fixedly connected to the side wall near the hammer.

[0013] Preferably, the top wall of the hammer is provided with a hook that is fixedly connected to it, and the width of the hook is smaller than the maximum diameter of the positioning cylinder.

[0014] Preferably, the rectangular plate has a threaded mounting hole in the middle, and an annular limiting plate is threadedly connected to the mounting hole. The rectangular plate also has a scale, the lower end of which passes through the rectangular plate and is fitted with a clearance. The upper end of the scale has a positioning plate fixedly connected to it, and the end of the positioning plate away from the scale contacts the top wall of the annular limiting plate.

[0015] Preferably, the base is provided with a position detection component that is detachably connected to it. The position detection component includes an annular baffle, at least two inclined plates, at least two elastic telescopic rods, and at least two position marking rods. The annular baffle has a strip-shaped position marking hole on its side wall. The annular baffle is detachably connected to the base. The lower ends of the at least two inclined plates are symmetrically hinged to the lower end of the inner wall of the annular baffle. One end of the at least two elastic telescopic rods is fixedly connected to the side wall of the annular baffle, and the other end is fixedly connected to the upper end of the inclined plates. One end of the position marking rod passes through the strip-shaped position marking hole and is fixedly connected to the inclined plate.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] This invention uses a limiting component between the gantry and the hammer to achieve precise control and adjustment of the hammer's hoisting height. By changing the hammer's height, the impact force of the hammer can be adjusted. In order to increase the upper limit of the hammer's impact force, a threaded disc and a spring are installed on a rectangular plate. The elastic force released after the spring is compressed indirectly increases the initial velocity of the hammer when it is released, thereby increasing the upper limit of the hammer's impact force. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a high-strain detection device for pile foundations.

[0019] Figure 2 This is a schematic cross-sectional view of a high-strain detection device for pile foundations.

[0020] Figure 3This is a schematic diagram of the dispersed structure of the rectangular plate and the threaded disk in an embodiment of the utility model.

[0021] Figure 4 This is a schematic diagram of the overall structure of the high strain detection device for pile foundations in Embodiment 2 of the utility model;

[0022] Figure 5 This is a schematic diagram of the dispersed structure of the annular limiting disk and the rectangular plate in Embodiment 2 of the utility model;

[0023] Figure 6 This is a schematic diagram of the overall structure of the high strain detection device for pile foundations in Embodiment 3 of the utility model;

[0024] Figure 7 This is a schematic diagram of the position detection component in Embodiment 3 of the utility model.

[0025] In the diagram: 1. Base; 2. Gantry frame; 20. Limiting hole; 3. Winch; 4. Steel cable; 5. Limiting assembly; 50. Rectangular plate; 500. First screw hole; 501. Positioning round hole; 502. Threaded concave hole; 503. Threaded disc; 504. Spring; 51. Limiting handle; 52. Mounting screw hole; 53. Annular limiting disc; 54. Scale; 540. Positioning plate; 6. Counterweight; 60. Positioning cylinder; 61. Hook; 7. Position detection assembly; 70. Annular baffle; 700. Strip-shaped position marking hole; 71. Inclined plate; 72. Elastic telescopic rod; 73. Position marking rod. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Please see the appendix Figure 1-3 A high-strain detection device for pile foundations, comprising:

[0028] The system comprises a base 1, a gantry frame 2, a winch 3, a steel cable 4, a limiting component 5, and a counterweight 6. The gantry frame 2 is fixedly connected to the base 1. The winch 3 is fixedly connected to the top wall of the gantry frame 2. The limiting component 5 is movably connected to the vertical frame of the gantry frame 2 and is located between the counterweight 6 and the top wall of the gantry frame 2. One end of the steel cable 4 is wound around the winch 3, and the other end passes through the top wall of the gantry frame 2 and the limiting component 5 in sequence before connecting to the counterweight 6. The steel cable 4 is clearance-fitted with both the gantry frame 2 and the limiting component 5.

[0029] In practical use, the detection device is placed on the pile foundation using a crane. After ensuring that the pile foundation is in the middle position of the base 1, the maximum suspension height of the hammer 6 is adjusted by adjusting the position of the limiting component 5. Then, the steel cable 4 is wound up by the winch 3, so that the hammer 6 is in a suspended state. The steel cable 4 is then quickly released by the winch 3 again, and the hammer 6 impacts the pile foundation by its own weight. When it is necessary to adjust the position of the limiting component 5, the position lock of the limiting component 5 is released, the hammer 6 is hoisted by the steel cable 4, and the limiting component 5 is lifted to a suitable height by the hammer 6. Then, the position lock of the limiting component 5 is locked.

[0030] Specifically, the vertical frame of the gantry 2 is provided with multiple sets of matching limiting holes 20.

[0031] Specifically, the limiting component 5 includes a rectangular plate 50 and a plurality of limiting handles 51. The side wall of the rectangular plate 50 is provided with a first screw hole 500 that matches the limiting hole 20. One end of the limiting handle 51 passes through the limiting hole 20 and is threadedly connected to the first screw hole 500. The limiting handle 51 and the limiting hole 20 are in clearance fit.

[0032] Considering the ease of adjustment of the limiting component 5, multiple limiting holes 20 are provided on the gantry 2. The limiting handle 51 passes through the limiting holes 20 at different positions and is threadedly connected to the rectangular plate 50 to complete the locking of the limiting component 5. It should be noted that in order to ensure that the rectangular plate 50 will not flip after being fixed, at least two limiting handles 51 need to be provided on one side of the rectangular plate 50, or a cross-shaped gantry 2 can be used, and the position of the rectangular plate 50 can be locked by fixing the positions of the four side walls.

[0033] Specifically, the rectangular plate 50 has a positioning hole 501 in the middle, and the top wall of the hammer 6 has a positioning cylinder 60 that is detachably connected to it. The end of the positioning cylinder 60 away from the hammer 6 is conical.

[0034] Considering that the steel cable 4 needs to pass through the rectangular plate 50 before connecting with the hammer 6 to achieve the hoisting of the hammer 6, a positioning hole 501 is set in the middle of the rectangular plate 50 to ensure that the steel cable 4 can pass through the rectangular plate to complete the hoisting of the hammer 6. At the same time, considering that the hammer 6 may sway during the suspension process, a positioning cylinder 60 is set on the hammer 6 to guide the impact trajectory of the hammer 6. The relative sliding between the positioning cylinder 60 and the positioning hole 501 ensures that the impact trajectory of the hammer 6 is straight when it impacts. In addition, in order to ensure that the positioning cylinder 60 can accurately pass through the positioning hole 501 during the hoisting of the hammer 6, the positioning cylinder 60 is set to be conical.

[0035] Specifically, the diameter of the end of the positioning cylinder 60 furthest from the hammer 6 is smaller than the diameter of the steel cable 4. Considering that the positioning cylinder 50 itself only serves to correct the impact trajectory of the hammer 6 and cannot connect the hammer 6 and the steel cable 4, the end of the positioning cylinder 50 with a smaller diameter needs to be larger than the diameter of the steel cable 4.

[0036] Specifically, the rectangular plate 50 has multiple threaded recesses 502 on its sidewall near the counterweight 6. Each threaded recess 502 has a matching threaded disc 503, and the threaded disc 503 has a spring 504 fixedly connected to it on its sidewall near the counterweight 6. Considering that the impact force of the counterweight 6 may vary during actual testing, and that replacing the heavier counterweight 6 or the taller gantry 2 is difficult and severely affects testing efficiency, multiple threaded recesses 502 are provided on the sidewall of the rectangular plate 50 near the counterweight 60. Simultaneously, a matching threaded disc 503 and spring 504 are installed. When it is necessary to increase the upper limit of the impact force of the hammer 6, an appropriate number of threaded discs 503 are installed. During the process of lifting the hammer 6, the hammer 6 compresses the spring 504. After the winch 3 releases the steel cable 4, the initial speed of the hammer 6 is increased under the action of the spring force of the spring 504, thereby achieving the purpose of increasing the impact force of the hammer 6. It should be noted that, considering the stability of the hammer 6, at least two threaded discs 503 and springs 504 need to be installed, and the positions of multiple threaded discs 503 and springs 504 need to be symmetrical to each other.

[0037] Specifically, the top wall of the hammer 6 is provided with a hook 61 that is fixedly connected to it, and the width of the hook 61 is smaller than the maximum diameter of the positioning cylinder 60. Considering that the hammer 6 may need to be replaced during the preparation stage, the hook 61 is provided on the hammer 6. At the same time, considering the detachable connection between the positioning cylinder 60 and the hammer, the overall width of the hook 61 needs to be smaller than the maximum diameter of the positioning cylinder 60 to avoid the hook 61 affecting the installation of the positioning cylinder 60.

[0038] Example 2

[0039] Please see the appendix Figure 4-5

[0040] Specifically, the rectangular plate 50 has a threaded mounting hole 52 in the middle, and an annular limiting plate 53 is threadedly connected to the mounting hole 52. The rectangular plate 50 is also provided with a scale 54. The lower end of the scale 54 passes through the rectangular plate 50 and is clearance-fitted with it. The upper end of the scale 54 is provided with a positioning plate 540 fixedly connected to it. The end of the positioning plate 540 away from the scale 54 contacts the top wall of the annular limiting plate 53.

[0041] In the embodiment of fixing the rectangular plate 50 by means of the limiting handle 51 and the limiting hole 20, the position adjustment of the rectangular plate 50 is limited because the position of the limiting hole 20 is fixed. For example, if the distance between the two limiting holes 20 is 30 cm, the rectangular plate 50 can only be adjusted in 30 cm increments each time it is moved forward. Moreover, this adjustment method is not continuous. Therefore, based on the existing rectangular plate 50, further optimization has been made. The setting of the annular limiting plate 53 threadedly connected to the threaded mounting screw hole 52 in the middle of the rectangular plate 50, and the contact between the annular limiting plate 53 and the counterweight 6 replaces the contact between the rectangular plate 50 and the counterweight 6 in the embodiment of the present invention, so that the actual application height of the counterweight 6 can be continuously adjusted. At the same time, in order to accurately control the height after adjustment, a scale 54 is also provided on the rectangular plate 50. The height after adjustment can be accurately controlled by the contact between the positioning plate 540 located at the upper end of the scale 54 and the annular limiting plate 53.

[0042] Example 3

[0043] Please see the appendix Figure 6-7

[0044] Specifically, the base 1 is provided with a position detection component 7 detachably connected thereto. The position adjustment component 7 includes an annular baffle 70, at least two inclined plates 71, at least two elastic telescopic rods 72, and at least two position marking rods 73. The annular baffle 70 has a strip-shaped position marking hole 700 on its side wall. The annular baffle 70 is detachably connected to the base 1. The lower ends of the at least two inclined plates 71 are symmetrically hinged to the lower end of the inner wall of the annular baffle 70. One end of the at least two elastic telescopic rods 72 is fixedly connected to the side wall of the annular baffle 70, and the other end is fixedly connected to the upper end of the inclined plate 71. One end of the position marking rod 73 passes through the strip-shaped position marking hole 700 and is fixedly connected to the inclined plate 71.

[0045] Considering that high-strain testing requires the pile foundation and the counterweight 6 to be concentric in the vertical direction to obtain relatively accurate test data, and given the significant weight of the base 1 and gantry 2, it is crucial to quickly adjust the position of the pile foundation and the counterweight 6. To achieve this, a position detection component 7 is installed inside the base 1. The basic position of the position detection component is fixed by a detachable connection between the annular baffle 70 and the base 1. Subsequently, during the lowering of the base 1 and gantry 2, the pile foundation will contact the inclined plate 71 inside the annular baffle 70. As the base 1 continues to lower, the inclined plate 71 will gradually be opened by the pile foundation. At this time, the position marker rod 73, which is fixedly connected to the inclined plate 71, will move horizontally and also move along the bar. The position indicator hole 700 moves vertically. If the pile foundation is located in the middle of the base 1, the two inclined plates 71 will be opened to similar degrees. At this time, the two position indicator rods 73 will be almost the same in both the horizontal and vertical directions. If the pile foundation is not located in the middle of the base 1, one inclined plate will inevitably be opened to a greater degree. At this time, the two position indicator rods 73 will be different. Based on this difference, the position can be adjusted in time before the base 1 and the gantry 2 are fully lowered. It should be noted that in order to quickly understand the degree of opening of the inclined plate 71, multiple segments of different colors can be set for the position indicator rods 73 or the strip position indicator hole 700 to achieve the purpose of quickly obtaining the information of the degree of opening of the inclined plate 71.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-strain detection device for pile foundations, characterized in that, include: The system comprises a base (1), a gantry frame (2), a winch (3), a steel cable (4), a limiting component (5), and a counterweight (6). The gantry frame (2) is fixedly connected to the base (1), the winch (3) is fixedly connected to the top wall of the gantry frame (2), and the limiting component (5) is movably connected to the vertical frame of the gantry frame (2). The limiting component (5) is located between the counterweight (6) and the top wall of the gantry frame (2). One end of the steel cable (4) is wound around the winch (3), and the other end passes through the top wall of the gantry frame (2) and the limiting component (5) in sequence before connecting to the counterweight (6). The steel cable (4) is clearance-fitted with the gantry frame (2) and the limiting component (5) respectively.

2. The high strain testing device for pile foundations according to claim 1, characterized in that: The gantry frame (2) has multiple sets of matching limiting holes (20) on its vertical frame.

3. The high strain testing device for pile foundations according to claim 2, characterized in that: The limiting component (5) includes a rectangular plate (50) and a plurality of limiting handles (51). The side wall of the rectangular plate (50) is provided with a first screw hole (500) that matches the limiting hole (20). One end of the limiting handle (51) passes through the limiting hole (20) and is threadedly connected to the first screw hole (500). The limiting handle (51) and the limiting hole (20) are in clearance fit.

4. The high strain testing device for pile foundations according to claim 3, characterized in that: The rectangular plate (50) has a positioning hole (501) in the middle, and the top wall of the hammer (6) has a positioning cylinder (60) that is detachably connected to it. The end of the positioning cylinder (60) away from the hammer (6) is conical.

5. A high-strain detection device for pile foundations according to claim 4, characterized in that: The diameter of the end of the positioning cylinder (60) away from the hammer (6) is larger than the diameter of the steel cable (4).

6. The high strain testing device for pile foundations according to claim 3, characterized in that: The rectangular plate (50) has a plurality of threaded recesses (502) on the side wall near the hammer (6), and each threaded recess (502) has a matching threaded disc (503). The threaded disc (503) has a spring (504) fixedly connected to the side wall near the hammer (6).

7. A high-strain detection device for pile foundations according to claim 4, characterized in that: The top wall of the hammer (6) is provided with a hook (61) that is fixedly connected to it, and the width of the hook (61) is smaller than the maximum diameter of the positioning cylinder (60).

8. A high-strain detection device for pile foundations according to claim 3, characterized in that: The rectangular plate (50) has a threaded mounting hole (52) in the middle. The mounting hole (52) is provided with an annular limiting plate (53) that is threadedly connected to it. The rectangular plate (50) is provided with a scale (54). The lower end of the scale (54) passes through the rectangular plate (50) and is fitted with it with a clearance. The upper end of the scale (54) is provided with a positioning plate (540) that is fixedly connected to it. The end of the positioning plate (540) away from the scale (54) is in contact with the top wall of the annular limiting plate (53).

9. A high-strain detection device for pile foundations according to claim 1, characterized in that: The base (1) is provided with a position detection component (7) detachably connected to it. The position detection component (7) includes an annular baffle (70), at least two inclined plates (71), at least two elastic telescopic rods (72), and at least two position marking rods (73). The annular baffle (70) has a strip-shaped position marking hole (700) on its side wall. The annular baffle (70) is detachably connected to the base (1). The lower ends of the at least two inclined plates (71) are symmetrically hinged to the lower end of the inner wall of the annular baffle (70). One end of the at least two elastic telescopic rods (72) is fixedly connected to the side wall of the annular baffle (70), and the other end is fixedly connected to the upper end of the inclined plate (71). One end of the position marking rod (73) passes through the strip-shaped position marking hole (700) and is fixedly connected to the inclined plate (71).

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