Hammer for small strain detection

Abstract

When the hammer for small strain detection is used, the left end and the right end of the cross rod are held by two hands respectively, the hammer is lifted, the lower end of the vertical rod of the hammer abuts against the pile top of a pile foundation to be detected, one end of the pull rope is wound through the pull rope winding device, and therefore the balance weight and the knocking head are pulled to rise. The counterweight is blocked by the lower end of the first vertical hole until reaching the upper limit position and cannot continue to rise; then, one end of the pull rope is not wound through the pull rope winding device any more, the balance weight and the knocking head freely fall, and knocking is completed through the knocking head. The hammer for small strain detection can conveniently and quickly knock a pile top in a small strain experiment, so that the working efficiency is improved, the same knocking force is ensured each time, and errors are reduced.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation integrity testing technology, and particularly to the field of small strain pile foundation testing technology, specifically referring to a hammer for small strain testing. Background Technology

[0002] Low-strain dynamic testing, also known as small-strain dynamic testing, is used in contrast to large-strain dynamic testing. It is commonly used in pile foundation integrity testing. The basic principle is as follows: A stress wave is generated by applying an excitation signal to the pile top. As this stress wave propagates along the pile, it encounters discontinuities (such as honeycomb, mud inclusions, fractures, and voids) and the pile bottom surface, generating reflected waves. By detecting and analyzing the propagation time, amplitude, and waveform characteristics of these reflected waves, the integrity of the pile can be determined. Advantages include simple equipment, rapid operation, and low cost, making it a powerful tool for assessing pile quality and highly popular with construction companies and contractors.

[0003] Traditional methods for small strain testing involve tapping the top of the pile with a small hammer during instrument testing. This method is not only inefficient and requires squatting next to the pile to be tested, making it inconvenient, but also the varying force of each tap can easily lead to deviations in the measurement data.

[0004] Therefore, it is desirable to provide a hammer for small strain testing that can conveniently and quickly strike the top of the pile during small strain experiments, thereby improving work efficiency while ensuring that the striking force is the same each time and reducing errors. Utility Model Content

[0005] In order to overcome the shortcomings of the prior art, one objective of this utility model is to provide a hammer for small strain testing, which can conveniently and quickly strike the top of the pile during small strain experiments, improve work efficiency, ensure the same striking force each time, reduce errors, and is suitable for large-scale promotion and application.

[0006] Another objective of this invention is to provide a hammer for small strain testing, which is ingeniously designed, has a simple structure, is easy to manufacture, has low manufacturing cost, and is suitable for large-scale application.

[0007] To achieve the above objectives, this utility model provides a hammer for small strain testing, characterized in that it includes a vertical bar, a horizontal bar, a counterweight, a striking head, a pull rope, and a pull rope winding device, wherein:

[0008] The middle part of the crossbar is located on the upper end of the vertical bar. The vertical bar has a vertical through hole, which includes a first vertical hole and a second vertical hole. The lower end of the first vertical hole is connected to the upper end of the second vertical hole. The crossbar has an inner cavity, which is connected to the upper end of the first vertical hole.

[0009] The counterweight and the striking head are both located in the second vertical hole and are vertically movable relative to the second vertical hole. The counterweight is disposed on the striking head.

[0010] The pull rope is located in the inner cavity, the first vertical hole and the second vertical hole. The pull rope winding device is disposed in the crossbar and extends into the inner cavity and is connected to one end of the pull rope for winding one end of the pull rope. The other end of the pull rope is located on the counterweight and connected to the counterweight.

[0011] The counterweight has an upper limit position, in which the counterweight is located below and abuts against the lower end of the first vertical hole, and the rope winding device winds one end of the rope.

[0012] Preferably, both the first vertical hole and the second vertical hole are circular holes, the counterweight is a cylindrical counterweight, and the diameter of both the second vertical hole and the counterweight is larger than the diameter of the first vertical hole.

[0013] Preferably, the vertical rod includes an upper tube and a lower tube, the lower end of the upper tube is vertically inserted into the upper end of the lower tube, the first vertical hole is disposed in the upper tube, the second vertical hole is disposed in the lower tube, and the middle part of the horizontal rod is disposed on the upper end of the upper tube.

[0014] Preferably, both the left and right ends of the crossbar are anti-slip ends.

[0015] Preferably, the crossbar is a transverse tube, and the inner cavity is the lumen of the transverse tube.

[0016] Preferably, the pull rope is a steel wire rope.

[0017] Preferably, the striking head is made of nylon.

[0018] Preferably, the rope winding device is located at the middle position of the right half of the crossbar.

[0019] Preferably, the rope winding device is an electric winding device, and the power on / off control switch of the electric winding device is exposed outside the crossbar.

[0020] More preferably, the electric winding device is a motor.

[0021] The main beneficial effects of this utility model are as follows:

[0022] 1. When using the small strain testing hammer of this utility model, hold the left and right ends of the horizontal bar of this utility model with both hands respectively, lift this utility model, and place the lower end of the vertical bar of this utility model against the top of the pile foundation to be tested. By winding one end of the rope through the rope winding device, the counterweight and the striking head are pulled up until the counterweight reaches the upper limit position and is blocked by the lower end of the first vertical hole, and cannot rise further. Then, the rope winding device is no longer used to wind one end of the rope, and the counterweight and the striking head fall freely. The striking head is used to complete the striking. Therefore, it can conveniently and quickly strike the top of the pile in small strain experiments, improve work efficiency, ensure the same striking force each time, reduce errors, and is suitable for large-scale promotion and application.

[0023] 2. When using the small strain testing hammer of this utility model, hold the left and right ends of the horizontal bar of this utility model with both hands respectively, lift this utility model, and place the lower end of the vertical bar of this utility model against the top of the pile foundation to be tested. The pull rope is wound around one end of the pull rope through the pull rope winding device, thereby pulling the counterweight and the striking head upward until the counterweight reaches the upper limit position and is blocked by the lower end of the first vertical hole, and cannot rise further. Then, the pull rope is no longer wound around one end of the pull rope through the pull rope winding device, and the counterweight and the striking head fall freely. The striking head completes the striking. Therefore, its design is ingenious, its structure is simple, its manufacturing is convenient, its manufacturing cost is low, and it is suitable for large-scale promotion and application.

[0024] These and other objects, features and advantages of this utility model will be fully apparent from the following detailed description and drawings, and can be achieved by the means, devices and combinations thereof specifically pointed out in the description of the utility model. Attached Figure Description

[0025] Figure 1 This is a three-dimensional perspective schematic diagram of a specific embodiment of the small strain detection hammer of this utility model.

[0026] Figure 2 yes Figure 1 The rear-view perspective diagram of the specific embodiment is shown.

[0027] Figure 3 yes Figure 1 The diagram shows a left-side perspective view of a specific embodiment.

[0028] Figure 4 yes Figure 1 The diagram shows a top perspective view of a specific embodiment.

[0029] (Symbol Explanation)

[0030] 1. Vertical rod; 2. Horizontal rod; 3. Counterweight; 4. Striking head; 5. Pull rope; 6. Pull rope winding device; 7. Vertical through hole; 8. First vertical hole; 9. Second vertical hole; 10. Inner cavity; 11. Upper pipe fitting; 12. Lower pipe fitting; 13. Power on / off control switch. Detailed Implementation

[0031] In order to better understand the technical content of this utility model, the following embodiments are provided for detailed description.

[0032] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0033] Please see Figures 1-4 As shown, in a specific embodiment of this utility model, the small strain testing hammer of this utility model includes a vertical rod 1, a horizontal rod 2, a counterweight 3, a striking head 4, a pull rope 5, and a pull rope winding device 6, wherein:

[0034] The middle part of the crossbar 2 is located on the upper end of the vertical bar 1. The vertical bar 1 is provided with a vertical through hole 7, which includes a first vertical hole 8 and a second vertical hole 9. The lower end of the first vertical hole 8 is connected to the upper end of the second vertical hole 9. The crossbar 2 is provided with an inner cavity 10, which is connected to the upper end of the first vertical hole 8.

[0035] The counterweight 3 and the striking head 4 are both located in the second vertical hole 9 and are vertically movable relative to the second vertical hole 9. The counterweight 3 is disposed on the striking head 4.

[0036] The pull rope 5 is located in the inner cavity 10, the first vertical hole 8 and the second vertical hole 9. The pull rope winding device 6 is disposed in the crossbar 2 and extends into the inner cavity 10 and is connected to one end of the pull rope 5 for winding one end of the pull rope 5. The other end of the pull rope 5 is located on the counterweight 3 and is connected to the counterweight 3.

[0037] The counterweight 3 has an upper limit position. At the upper limit position, the counterweight 3 is located below and abuts against the lower end of the first vertical hole 8. The rope winding device 6 winds one end of the rope 5.

[0038] The first vertical hole 8, the second vertical hole 9, and the counterweight 3 can have any suitable shape. In a specific embodiment of this utility model, the first vertical hole 8 and the second vertical hole 9 are both circular holes, and the counterweight 3 is a cylindrical counterweight. The diameter of the second vertical hole 9 and the diameter of the counterweight 3 are both larger than the diameter of the first vertical hole 8.

[0039] The vertical rod 1 can have any suitable configuration; please refer to [link / reference]. Figures 1-4 As shown, in a specific embodiment of this utility model, the vertical rod 1 includes an upper tube 11 and a lower tube 12. The lower end of the upper tube 11 is vertically inserted into the upper end of the lower tube 12. The first vertical hole 8 is disposed in the upper tube 11, and the second vertical hole 9 is disposed in the lower tube 12. The middle part of the horizontal rod 2 is disposed on the upper end of the upper tube 11. In the above case, the diameter of the second vertical hole 9 is equal to the outer diameter of the upper tube 11.

[0040] The upper pipe fitting 11 and the lower pipe fitting 12 can be pipe fittings of any suitable material. In a specific embodiment of this utility model, the upper pipe fitting 11 and the lower pipe fitting 12 are both steel pipes.

[0041] The left and right ends of the crossbar 2 can be any suitable ends. In a specific embodiment of this utility model, the left and right ends of the crossbar 2 are both anti-slip ends, used as anti-slip handles.

[0042] The crossbar 2 can have any suitable shape. In a specific embodiment of this utility model, the crossbar 2 is a transverse tube, and the inner cavity 10 is the cavity of the transverse tube.

[0043] The transverse fitting can be made of any suitable material. In one specific embodiment of this utility model, the transverse fitting is a steel pipe.

[0044] The pull rope 5 can be made of any suitable material. In a specific embodiment of this utility model, the pull rope 5 is a steel wire rope.

[0045] The striking head 4 can be made of any suitable material. In a specific embodiment of this utility model, the striking head 4 is made of nylon.

[0046] The striking head 4 can have any suitable shape. In a specific embodiment of this utility model, the striking head 4 is a cylindrical striking head.

[0047] The rope winding device 6 can be set at any suitable position on the crossbar 2. Please refer to [link / reference]. Figures 1-2 and Figure 4 As shown, in a specific embodiment of this utility model, the rope winding device 6 is located at the middle position of the right half of the crossbar 2.

[0048] The rope winding device 6 can be any suitable type of rope winding device; please refer to [link / reference]. Figures 1-4As shown, in a specific embodiment of this utility model, the rope winding device 6 is an electric winding device, and the power-on / power-off control switch 13 of the electric winding device is exposed outside the crossbar 2. With this configuration, when it is necessary to wind one end of the rope 5 through the rope winding device 6, the electric winding device is energized through the power-on / power-off control switch 13; when it is no longer necessary to wind one end of the rope 5 through the rope winding device 6, the electric winding device is de-energized through the power-on / power-off control switch 13.

[0049] The power-on / power-off control switch 13 can be any suitable type of control switch. In a specific embodiment of this utility model, the power-on / power-off control switch 13 is a lever control switch.

[0050] The electric winding device can be any suitable electric winding device. In one specific embodiment of this utility model, the electric winding device is a motor.

[0051] In use, hold the left and right ends of the horizontal bar 2 of this utility model with both hands respectively, lift the utility model, and place the lower end of the vertical bar 1 of this utility model against the top of the pile foundation to be tested. The pull rope 5 is wound around one end by the pull rope winding device 6, thereby pulling the counterweight 3 and the striking head 4 upward until the counterweight 3 reaches the upper limit position and is blocked by the lower end of the first vertical hole 8, and cannot continue to rise. Then, the pull rope 5 is no longer wound around one end by the pull rope winding device 6, and the counterweight 3 and the striking head 4 fall freely, and the striking head 4 completes the striking.

[0052] Therefore, with this invention, each strike involves raising the counterweight to its upper limit position and then letting it fall freely, with the striking head completing the strike. Since the counterweight rises to the same height, the striking force is the same each time.

[0053] This invention uses a rope winding device to pull a counterweight up to the same height, then the counterweight falls freely, repeating the same amount of striking force. The experimenter can use it standing up, making the process of striking the pile top more convenient, improving work efficiency, ensuring consistent striking force each time, and reducing experimental errors. This invention has a simple structure, is easy to operate, and is inexpensive, making it suitable for daily use and maintenance.

[0054] In summary, the small strain testing hammer of this invention can conveniently and quickly strike the top of the pile during small strain experiments, improving work efficiency while ensuring the same striking force each time, reducing errors. It has an ingenious design, simple structure, is easy to manufacture, and has low manufacturing cost, making it suitable for large-scale promotion and application.

[0055] Therefore, it is evident that the objective of this utility model has been fully and effectively achieved. The function and structural principles of this utility model have been demonstrated and explained in the embodiments. Without departing from the stated principles, any modifications can be made to the implementation methods. Therefore, this utility model includes all modified embodiments based on the spirit and scope of the claims.

Claims

1. A hammer for small strain testing, characterized in that, Includes a vertical bar, a horizontal bar, a counterweight, a striking head, a pull rope, and a pull rope winding device, wherein: The middle part of the crossbar is located on the upper end of the vertical bar. The vertical bar has a vertical through hole, which includes a first vertical hole and a second vertical hole. The lower end of the first vertical hole is connected to the upper end of the second vertical hole. The crossbar has an inner cavity, which is connected to the upper end of the first vertical hole. The counterweight and the striking head are both located in the second vertical hole and are vertically movable relative to the second vertical hole. The counterweight is disposed on the striking head. The pull rope is located in the inner cavity, the first vertical hole and the second vertical hole. The pull rope winding device is disposed in the crossbar and extends into the inner cavity and is connected to one end of the pull rope for winding one end of the pull rope. The other end of the pull rope is located on the counterweight and connected to the counterweight. The counterweight has an upper limit position, in which the counterweight is located below and abuts against the lower end of the first vertical hole, and the rope winding device winds one end of the rope.

2. The hammer for small strain testing as described in claim 1, characterized in that, Both the first vertical hole and the second vertical hole are circular holes, and the counterweight is a cylindrical counterweight. The diameter of the second vertical hole and the diameter of the counterweight are both larger than the diameter of the first vertical hole.

3. The hammer for small strain testing as described in claim 1, characterized in that, The vertical rod includes an upper tube and a lower tube. The lower end of the upper tube is vertically inserted into the upper end of the lower tube. The first vertical hole is provided in the upper tube, and the second vertical hole is provided in the lower tube. The middle part of the horizontal rod is provided on the upper end of the upper tube.

4. The hammer for small strain testing as described in claim 1, characterized in that, Both the left and right ends of the crossbar are anti-slip ends.

5. The hammer for small strain testing as described in claim 1, characterized in that, The crossbar is a transverse tube, and the inner cavity is the lumen of the transverse tube.

6. The hammer for small strain testing as described in claim 1, characterized in that, The pull rope is a steel wire rope.

7. The hammer for small strain testing as described in claim 1, characterized in that, The striking head is made of nylon.

8. The hammer for small strain testing as described in claim 1, characterized in that, The rope winding device is located in the middle of the right half of the crossbar.

9. The hammer for small strain testing as described in claim 1, characterized in that, The rope winding device is an electric winding device, and the power on / off control switch of the electric winding device is exposed outside the crossbar.

10. The hammer for small strain testing as described in claim 9, characterized in that, The electric winding device is a motor.

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