Knocking hammer for foundation pile dynamic tester

Abstract

The utility model discloses a knocking hammer for a foundation pile dynamic testing instrument, which comprises a mounting plate, four vertically arranged supporting legs are fixedly mounted on the mounting plate downwards, the supporting legs are arranged in a rectangular shape, a sliding hole is formed in the mounting plate, a sliding rod is in sliding fit with the sliding hole, a guide structure is further arranged between the mounting plate and the sliding rod, and the guide structure is arranged on the mounting plate. A handle is fixed to the upper end of the sliding rod, a hammer head base is fixed to the lower end of the sliding rod, a hammer head is fixed to the hammer head base downwards, the outer side of the sliding rod is sleeved with a compression spring, and the two ends of the compression spring abut against the mounting plate and the hammer head base. An in-place locking structure and a releasing structure are further arranged between the mounting plate and the sliding rod. The knocking hammer for the foundation pile dynamic tester has the advantages of being simple, stable, long in service life and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction equipment, in particular to a percussion hammer for a foundation pile dynamic measuring instrument. Background Art

[0002] The pile dynamic tester is an instrument for testing pile foundations. The method is usually to use a hammer to hit the top of the pile, and the stress wave generated is received by the acceleration or velocity sensor installed on the top of the pile. The reflected wave signal is then received by the pile tester after signal amplification and other processing to obtain the acceleration time history curve. The impedance change position or pile length can be determined from the curve shape characteristics, and the strength grade of the concrete can be estimated from the average wave velocity.

[0003] When using a hammer to hit the pile surface, the energy should be moderate. If the energy is small, the stress wave will decay quickly, so that the defects at the bottom of the pile and the reflection at the bottom of the pile cannot be seen. In addition, the direction of the hammering should be perpendicular to the pile surface, the excitation point should be flat, the excitation point should be crisp, and the excitation point should be far away from the main reinforcement of the steel cage to form a single disturbance. However, the hammering force and hammering direction are controlled by the test personnel, and it is difficult to stably meet the above requirements, which is not conducive to improving the accuracy of the test results.

[0004] The detection hammer for the pile foundation dynamic testing instrument disclosed in Chinese Patent 201920440629.6 has a force sensor installed in the detection hammer, which increases the structural complexity of the detection hammer. In addition, the detection hammer is transmitted through a clamp, has poor stability and a short lifespan. Summary of the invention

[0005] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by this patent application is how to provide a percussion hammer for a pile foundation dynamic measuring instrument that is simple, stable, has a long service life, and is easy to operate.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A percussion hammer for a pile foundation dynamic measuring instrument comprises a mounting plate, wherein four vertically arranged legs are fixedly mounted downward on the mounting plate, and the legs are arranged in a rectangular shape.

[0008] The mounting plate is provided with a sliding hole, the sliding hole is slidably matched with a sliding rod, a guiding structure is further provided between the mounting plate and the sliding rod, a handle is fixed to the upper end of the sliding rod, a hammer head seat is fixed to the lower end of the sliding rod, a hammer head is fixed downwardly to the hammer head seat, a compression spring is sleeved on the outer side of the sliding rod, and both ends of the compression spring are in contact with the mounting plate and the hammer head seat;

[0009] A locking structure and a releasing structure are also provided between the mounting plate and the slide bar.

[0010] In this way, when in use, place the support leg on the pile, pull the handle upward to drive the slide bar to move upward, and after moving into position, the release structure locks the slide bar, which can ensure that the slide bar reaches the same position each time it is pulled upward, and better ensure the stability of the elastic potential energy of the compression spring each time. During detection, the release structure is unlocked and the compression spring is reset. Under the action of elastic potential energy, the slide bar moves downward and drives the hammer head to strike the pile. At the same time, the locking structure in place locks the lowest point state of the slide bar to avoid repeated striking of the hammer head under the action of the compression spring, thereby improving the accuracy of detection.

[0011] Wherein, the guide structure comprises a guide groove provided on the mounting plate, the guide groove is communicated with the slide hole, and a guide rail which is slidably matched with the guide groove is fixed on the outer side of the slide rod.

[0012] Among them, the locking structure in place includes a wheel axle, and the first support and the second support are rotatably provided at both ends of the wheel axle, and the first support and the second support are fixedly mounted on the mounting plate, and a gear and a ratchet are fixed on the wheel axle, and a rack meshing with the gear is fixed on the outer side of the sliding rod, and a yield groove connected to the sliding hole is opened on the mounting plate opposite to the rack; a rotating shaft is fixed on the first support, and a pawl is rotatably provided on the rotating shaft, and a torsion spring is sleeved on the rotating shaft, and the two ends of the torsion spring are respectively fixedly connected to the rotating shaft and the pawl, and the pawl cooperates with the ratchet.

[0013] Among them, the release structure includes a vertical plate fixedly installed on the mounting plate, the vertical plate is slidably matched with a pin shaft, the outer end of the pin shaft is fixed with a pin handle, the outer side of the pin shaft is sleeved with a tension spring, the two ends of the tension spring are fixedly connected to the vertical plate and the pin handle, and the sliding rod is provided with a pin hole that can be plugged and matched with the pin shaft.

[0014] Among them, reinforcing rods are fixed between the legs, and four reinforcing rods are arranged in a rectangular shape.

[0015] In summary, the percussion hammer used in the pile dynamic tester has the advantages of being simple and stable, having a long service life and being easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of the structure of a percussion hammer for a pile foundation dynamic measuring instrument.

[0017] Figure 2 for Figure 1 Schematic diagram of another orientation.

[0018] Figure 3 for Figure 2 Enlarged schematic diagram at point A in the middle. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "upper, lower" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0020] like Figure 1-3 As shown, a percussion hammer for a pile foundation dynamic measuring instrument comprises a mounting plate 1, on which four vertically arranged legs 2 are fixedly mounted downward, and the legs are arranged in a rectangular shape.

[0021] The mounting plate is provided with a sliding hole, and a sliding rod 3 is slidably matched with the sliding hole. A guiding structure is also provided between the mounting plate and the sliding rod. A handle 4 is fixed to the upper end of the sliding rod, and a hammer head seat 5 is fixed to the lower end of the sliding rod. A hammer head 6 is fixed downwardly to the hammer head seat. A compression spring 7 is sleeved on the outer side of the sliding rod, and both ends of the compression spring are in contact with the mounting plate and the hammer head seat.

[0022] A locking structure and a releasing structure are also provided between the mounting plate and the slide bar.

[0023] In this way, when in use, place the support leg on the pile, pull the handle upward to drive the slide bar to move upward, and after moving into position, the release structure locks the slide bar, which can ensure that the slide bar reaches the same position each time it is pulled upward, and better ensure the stability of the elastic potential energy of the compression spring each time. During detection, the release structure is unlocked and the compression spring is reset. Under the action of elastic potential energy, the slide bar moves downward and drives the hammer head to strike the pile. At the same time, the locking structure in place locks the lowest point state of the slide bar to avoid repeated striking of the hammer head under the action of the compression spring, thereby improving the accuracy of detection.

[0024] During implementation, the guide structure includes a guide groove provided on the mounting plate, the guide groove is connected to the slide hole, and a guide rail 8 is fixed on the outer side of the slide bar to slide with the guide groove, so as to guide the movement of the slide bar.

[0025] During implementation, the locking structure in place includes a wheel axle, and the first support 9 and the second support 10 are rotatably provided at both ends of the wheel axle, and the first support and the second support are fixedly mounted on the mounting plate, and a gear 11 and a ratchet 12 are fixed on the wheel axle, and a rack 13 meshing with the gear is fixed on the outer side of the slide rod, and a yield groove connected to the sliding hole is provided on the mounting plate opposite to the rack; a rotating shaft is fixed on the first support, and a pawl 14 is rotatably provided on the rotating shaft, and a torsion spring is sleeved on the rotating shaft, and the two ends of the torsion spring are respectively fixedly connected to the rotating shaft and the pawl, and the pawl cooperates with the ratchet.

[0026] In this way, the pawl cooperates with the ratchet to form a locking structure, which requires the slide bar to move upward and rotate the pawl outward, so that the pawl releases the lock on the ratchet. After the slide bar moves into place, the pawl is released, and the release structure locks the slide bar. After the release structure is unlocked, the slide bar moves downward under the elastic potential energy of the compression spring, and the gear, axle and ratchet are driven to rotate through the rack. When the slide bar reaches the lowest end, the hammer head collides with the pile, and the pile provides a reaction force to the hammer head, causing the hammer head to tend to move upward. At this time, the pawl can stably lock the ratchet position, thereby locking the current slide bar position and preventing the slide bar from rebounding.

[0027] During implementation, the release structure includes a vertical plate 15 fixedly mounted on the mounting plate, the vertical plate is slidably matched with a pin shaft, a pin handle 16 is fixed to the outer end of the pin shaft, a tension spring 17 is sleeved on the outer side of the pin shaft, the two ends of the tension spring are fixedly connected to the vertical plate and the pin handle, and a pin hole 19 capable of plugging and matching with the pin shaft is provided on the slide bar. When the handle is pulled upward to drive the slide bar to move upward, when the pin hole is facing the pin shaft, under the action of the tension spring, the pin shaft enters the pin hole and locks the slide bar position in the current state. When release is required, the pin handle is pulled outward, the pin shaft is disengaged from the pin hole, and the release is completed.

[0028] During implementation, reinforcing rods 18 are fixed between the legs, and four reinforcing rods are arranged in a rectangular shape to improve stability.

[0029] Finally, it should be noted that those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.

Claims

1. A percussion hammer for a pile foundation dynamic measuring instrument, comprising a mounting plate, wherein four vertically arranged legs are fixedly mounted downward on the mounting plate, and the legs are arranged in a rectangular shape, characterized in that: The mounting plate is provided with a sliding hole, the sliding hole is slidably matched with a sliding rod, a guiding structure is further provided between the mounting plate and the sliding rod, a handle is fixed to the upper end of the sliding rod, a hammer head seat is fixed to the lower end of the sliding rod, a hammer head is fixed downwardly to the hammer head seat, a compression spring is sleeved on the outer side of the sliding rod, and both ends of the compression spring are in contact with the mounting plate and the hammer head seat; A locking structure and a releasing structure are also provided between the mounting plate and the slide bar.

2. The percussion hammer for a pile foundation dynamic measuring instrument according to claim 1, characterized in that: The guide structure comprises a guide groove formed on the mounting plate, the guide groove is communicated with the slide hole, and a guide rail which is slidably matched with the guide groove is fixed on the outer side of the slide rod.

3. The percussion hammer for pile foundation dynamic measuring instrument according to claim 2, characterized in that: The in-place locking structure includes a wheel axle, and a first support and a second support are rotatably provided at both ends of the wheel axle, and the first support and the second support are fixedly mounted on a mounting plate, a gear and a ratchet are fixed on the wheel axle, a rack meshing with the gear is fixed on the outer side of the slide rod, and a yield groove connected to the sliding hole is provided on the mounting plate opposite to the rack; a rotating shaft is fixed on the first support, a pawl is rotatably provided on the rotating shaft, a torsion spring is sleeved on the rotating shaft, and both ends of the torsion spring are fixedly connected to the rotating shaft and the pawl respectively, and the pawl cooperates with the ratchet.

4. The percussion hammer for a pile foundation dynamic measuring instrument according to claim 1, characterized in that: The release structure includes a vertical plate fixedly mounted on the mounting plate, the vertical plate slidably cooperates with a pin shaft, a pin handle is fixed to the outer end of the pin shaft, a tension spring is sleeved on the outer side of the pin shaft, both ends of the tension spring are fixedly connected to the vertical plate and the pin handle, and a pin hole that can be plugged and cooperated with the pin shaft is opened on the sliding rod.

5. The percussion hammer for a pile foundation dynamic measuring instrument according to claim 1, characterized in that: Reinforcement rods are fixed between the legs, and four reinforcement rods are arranged in a rectangular shape.

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