High-strain drop hammer device for pile foundation detection

Abstract

The utility model relates to the field of pile foundation detection equipment, in particular to a high-strain drop hammer device for pile foundation detection. The utility model provides a high strain drop hammer device for pile foundation detection, which comprises a support frame and a drop hammer arranged in the support frame, the top of the drop hammer is provided with a lifting ring for hooking and lifting of a lifting appliance, and the side wall, close to the drop hammer, of the support frame is provided with a vertical graduated scale. According to the high-strain drop hammer device for pile foundation detection, the height from the drop hammer to the top face of the pile foundation to be detected can be accurately given, manual measurement of detection personnel is not needed, and potential safety hazards are few.

Description

Technical Field

[0001] This utility model relates to the field of pile foundation testing equipment, specifically to a high-strain drop hammer device for pile foundation testing. Background Technology

[0002] Pile foundations have a significant impact on building performance parameters. To ensure building quality, testing personnel need to inspect the pile foundations after they have been formed to obtain performance indicators such as compressive strength and density, thereby determining whether the pile foundations meet the standards. A commonly used pile foundation measurement method is the high-strain method, which requires testing personnel to install a large falling weight device directly above the pile foundation to conduct the measurement. Existing falling weight devices include a support frame, a lifting device mounted on the support frame, and a large falling weight mounted in the support frame. The top of the falling weight has a lifting ring for the lifting device to hook onto. To implement high-strain method measurements, inspectors first install multiple sensors (such as displacement sensors, stress wave sensors, and acceleration sensors) around the pile foundation to be tested. The ground around the pile foundation is then leveled. A support frame for the drop hammer device is erected on the leveled ground, positioned above the pile foundation. A lifting hook is used to attach the top ring of the drop hammer, suspending it at a certain height directly above the pile foundation. Then, the inspectors operate the lifting hook to release the drop hammer, allowing it to fall freely under its own weight and strike the top surface of the pile foundation. Multiple sensors installed around the pile foundation measure and output corresponding data in real time. The inspectors then calculate and analyze this data to obtain information about the pile foundation's integrity. During the testing process, to ensure the accuracy of the data measured by the sensors, the direction and force of the drop hammer when striking the top surface of the pile foundation under test are crucial. Specifically: whether the ground around the pile foundation is level determines whether the support frame will tilt after installation, thus affecting the direction of the drop hammer; while the height of the drop hammer directly above the pile foundation affects the striking force. For the former, the testing personnel can ensure that the support frame is installed vertically and without tilt by leveling the ground around the pile foundation, thus ensuring that the drop hammer on the support frame is vertically downward and aimed at the pile foundation. However, for the latter, the testing personnel can only operate the hoist to suspend the drop hammer while manually measuring the height of the drop hammer from the top surface of the pile foundation with a ruler. This manual measurement method is both inaccurate and poses safety hazards. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a high-strain drop hammer device for pile foundation testing, which can accurately give the height of the drop hammer from the top surface of the pile foundation to be tested, without requiring manual measurement by the testing personnel, and with fewer safety hazards.

[0004] To solve the above problems, this utility model provides a high-strain drop hammer device for pile foundation testing, including a support frame and a drop hammer installed in the support frame. The top of the drop hammer is provided with a lifting ring for a lifting device to hook and lift it. A vertical scale is provided on the side wall of the support frame near the drop hammer.

[0005] Furthermore, a hydraulic foot is installed at each of the four corners of the bottom surface of the support frame, and each hydraulic foot can be raised or lowered individually.

[0006] Furthermore, the scale is movably mounted on the side wall and can move up and down relative to the support frame.

[0007] Furthermore, a vertical slot is provided on the side wall, which leads to the bottom surface of the support frame. Specifically, the scale is movably engaged in the vertical slot and can move up and down along the vertical slot.

[0008] Furthermore, the edge of the scale is a rack, and a gear that meshes with the rack is installed on the side wall. When the gear rotates in the forward or reverse direction, it drives the scale to move upward or downward along the vertical groove via the edge of the rack.

[0009] Furthermore, it includes a rotating wheel for human rotation, the wheel being equipped with a connecting shaft, one end of which is fixedly connected to the center of the rotating wheel and the other end of which is fixedly connected to the center of the gear. The rotating wheel rotates in the forward or reverse direction by driving the gear through the rotating shaft to achieve the forward or reverse rotation.

[0010] Furthermore, the support frame is equipped with a level.

[0011] Furthermore, it includes a positioning ring that can be fitted around the periphery of the pile foundation to be tested, and the positioning ring has multiple positioning through holes for assisting in the installation of sensors.

[0012] Beneficial effects: The drop hammer device of this utility model has a vertical scale on the side wall of the support frame near the drop hammer. The tester can visually observe the scale corresponding to the drop hammer to obtain the height of the drop hammer from the top surface of the pile foundation to be tested with relatively high accuracy. The tester does not need to manually measure as in the prior art, and there are fewer safety hazards. Attached Figure Description

[0013] Figure 1 This is a simplified structural diagram of a high-strain drop hammer device used for pile foundation testing.

[0014] Figure 2 This is a simplified structural diagram of a high-strain drop hammer device for pile foundation testing, viewed from below.

[0015] Figure 3 This is a simplified diagram of a high-strain drop hammer device used for pile foundation testing, with the partial explosion after the hammer falls hidden.

[0016] Figure 4It is a schematic structural diagram of the rear view angle of the high-strain drop hammer device for pile foundation detection.

[0017] Figure 5 It is a partial explosion schematic diagram of the rear view angle of the high-strain drop hammer device for pile foundation detection.

[0018] Figure 6 It is a schematic structural diagram of the positioning ring.

[0019] Figure 7 It is a schematic structural diagram of the high-strain drop hammer device for pile foundation detection erected on the pile foundation to be measured.

[0020] Figure 8 It is a front schematic diagram of the high-strain drop hammer device for pile foundation detection erected on the pile foundation to be measured.

[0021] Symbol description:

[0022] 1 - Support frame; 11 - Top plate; 111 - Vertically disposed through hole; 12 - Rear side plate; 121 - Vertical card slot; 122 - Accommodation bin; 21 - Level gauge; 22 - Hydraulic floor feet; 3 - Drop hammer; 31 - Hoisting ring; 4 - Scale ruler; 41 - Edge; 5 - Elastic positioning ring; 51 - Positioning through hole; 6 - Pile foundation to be measured; 61 - Installation hole; 71 - Gear; 72 - Runner; 73 - Coupling shaft. Specific embodiments

[0023] The following further elaborates on the present invention in detail in conjunction with specific embodiments.

[0024] The high-strain drop hammer device for pile foundation detection is shown in Figure 1 , including a support frame 1, which is a frame structure. A level gauge 21 is installed at the bottom of the support frame 1; a hydraulic floor foot 22 (see Figure 2 ) is installed at each of the four corners of the bottom surface of the support frame 1. These hydraulic floor feet 22 can be individually raised or lowered to level the level gauge 21 at the bottom of the support frame 1, so that the support frame 1 can be in a horizontal and vertical state. The hydraulic floor feet 22 and the level gauge 21 are prior arts, and their specific structures and working principles are not elaborated here. In other embodiments, the hydraulic floor feet 22 can be replaced with mechanical lifting floor feet or telescopic cylinders.

[0025] A drop hammer 3 is provided in the support frame 1, and a hoisting ring 31 is provided at the top of the drop hammer 3. The support frame 1 has a top plate 11, on which a vertically disposed through hole 111 aligned with the hoisting ring 31 is opened; the high-strain drop hammer device for pile foundation detection is equipped with a hoisting tool such as a crane or a hoisting rope (not shown in the figure, which is a prior art). The hoisting tool extends downward through the vertically disposed through hole 111 above the top plate 11 to the top of the drop hammer 3 and hooks the hoisting ring 31 at the top of the drop hammer 3, so that the drop hammer 3 can be suspended in the air. The support frame 1 has a rear side plate Figure 2 The vertical slot 121 extends upward to the top plate 11 of the support frame 1 and downward to the bottom surface of the support frame 1. A vertical scale 4 is movably engaged in the vertical slot 121. The shape of the scale 4 matches the vertical slot 121. The scale 4 is marked with graduations on the front surface of the drop hammer 3, which is convenient for the tester to visually determine the height of the drop hammer 3.

[0026] The high-strain drop hammer device for pile foundation testing has an elastic positioning ring 5 outside the support frame 1, see Figure 6 The elastic positioning ring 5 has six radially arranged positioning through holes 51. These six positioning through holes 51 are divided into two groups, with three positioning through holes 51 in the same group arranged at intervals, and the three positioning through holes 51 in the first group and the three positioning through holes 51 in the second group arranged symmetrically to each other. To perform high strain gauge measurements, the testing personnel need to first place the elastic positioning ring 5 around the pile foundation 6 to be tested (see...). Figure 7 Around the perimeter, use a drill bit to drill six mounting holes 61 around the pile foundation to be tested through the six positioning through holes 51 on the elastic positioning ring 5 (see...). Figure 8 These six mounting holes 61 are thus divided into two groups arranged symmetrically at the center. The inspectors installed one displacement sensor (not shown in the figure), one stress wave sensor (not shown in the figure), and one acceleration sensor (not shown in the figure) into each of the three mounting holes 61 in each group. The two displacement sensors, two stress wave sensors, and two acceleration sensors of different groups were then installed on the pile foundation 6 to be measured in a symmetrical manner for measurement. This completes the preparatory work before measurement.

[0027] See Figure 8After completing the preparatory work before measurement, the inspectors need to level the ground around the pile foundation 6 to be measured. On the leveled ground, they then erect the support frame 1 for the drop hammer device, positioning it above the pile foundation 6 and placing the drop hammer 3 directly above it. If, after erecting the support frame 1, the inspectors find that the level 21 of the support frame 1 is not completely level, it indicates that the ground is not completely level and the support frame 1 is not in a horizontal and vertical position. In this case, the inspectors can adjust the four hydraulic feet 22 of the support frame 1 to level the level 21, ensuring the support frame 1 is in a horizontal and vertical position without dismantling the erected support frame 1 and re-leveling the ground. After the support frame 1 is erected, the testing personnel operate the lifting tool to extend downwards through the vertical through-hole 111 of the top plate 11 of the support frame 1 to the top of the drop hammer 3 and hook it onto the lifting ring 31 at the top of the drop hammer 3. Then, the lifting tool is operated to retract upwards, suspending the drop hammer 3 directly above the pile foundation 6 to be tested. The testing personnel can observe the scale 4 on the rear side plate 12 of the drop hammer 3 and the support frame 1, and judge the actual height of the drop hammer 3 from the top surface of the pile foundation 6 by visually observing the scale 4 corresponding to the drop hammer 3. At the same time, the lifting tool is operated to adjust the height of the drop hammer 3 until the drop hammer 3 is suspended at the required height. Since the testing personnel do not need to manually measure the height of the drop hammer 3 as in the background technology, there are fewer safety hazards. After the drop hammer 3 is suspended to the required height, the inspector can operate the lifting device to release the hook. The drop hammer 3 will no longer be suspended by the lifting device and will fall freely under its own weight, landing on the top surface of the pile foundation 6 under test directly below to complete the impact. Multiple sensors installed around the pile foundation 6 under test will measure and output corresponding data in real time. The inspector can calculate and analyze the data to obtain the integrity information of the pile foundation.

[0028] During actual measurements, because the height of each pile foundation 6 protruding above the ground is not exactly the same, after the testing personnel set up the support frame 1 as described above, sometimes the bottom surface (starting surface) of the scale 4 is not aligned with the top surface of the pile foundation 6. For this, see... Figure 5 A partial opening is left on the rear side wall of the rear panel 12 of the support frame 1 to form a receiving compartment 122, which leads to the vertical slot 121 (see Figure 3 This allows part of the edge 41 of the scale 4 in the vertical slot 121 to be exposed. See Figure 3 , Figure 4 and Figure 5The edge 41 of the scale 4 near the accommodating compartment 122 is a rack (not shown in the figure), and a gear 71 meshing with the rack is installed in the accommodating compartment 122. A rotating wheel 72 for human rotation is provided at the rear of the accommodating compartment 122. The rotating wheel 72 is equipped with a rotating shaft. The front end of the rotating shaft extends into the accommodating compartment 122 and is rotatably connected to the bottom wall of the accommodating compartment 122 (i.e., the rear side wall of the rear side plate 12), so that the rotating shaft can rotate relative to the rear side plate 12 around its own axis. The rear end of the rotating shaft is fixedly connected to the center of the rotating wheel 72, while the front end is fixedly connected to the center of the gear 71. In this way, when the testing personnel find that the bottom surface of the scale 4 is not aligned with the top surface of the pile foundation 6 to be tested after the support frame 1 has been erected, the rotating wheel 72 can be rotated in the forward or reverse direction. The rotating wheel 72 drives the gear 71 to rotate in the forward or reverse direction through the rotating shaft. The scale 4 is then moved upward or downward relative to the support frame 1 along the vertical groove 121 via the rack edge 41 of the scale 4 until the bottom surface of the scale 4 is aligned with the top surface of the pile foundation 6 to be tested.

[0029] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection. Any non-substantial changes or substitutions made by those skilled in the art based on the present invention will still fall within the scope of patent protection.

Claims

1. A high strain drop hammer device for pile testing, comprising a support frame and a drop hammer arranged in the support frame, a lifting ring is arranged at the top of the drop hammer for a lifting device to hook and lift, characterized in that, The side wall close to the falling hammer of the support frame is provided with a vertical scale ruler.

2. The high strain drop hammer device for pile testing according to claim 1, wherein, Each hydraulic foot can be individually raised or lowered.

3. A high strain drop hammer device for pile testing as claimed in claim 2, wherein, The side wall is provided with a vertical clamping groove, which is connected to the bottom surface of the support frame, and the scale ruler is specifically clamped in the vertical clamping groove and can be vertically translated along the vertical clamping groove.

4. A high strain drop hammer device for pile testing as claimed in claim 3 wherein, The scale ruler is provided with a gear rack, and a gear is arranged on the side wall and engaged with the gear rack.

5. A high strain drop hammer device for pile testing as claimed in claim 4 wherein, The support frame is provided with a level.

6. The high strain drop hammer device for pile testing according to claim 1, wherein The positioning ring is provided with a plurality of positioning through holes for assisting the installation of sensors.

7. The high strain drop hammer device for pile testing according to claim 1, wherein ​

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