Foundation pile stress wave excitation device

Abstract

The foundation pile stress wave excitation device comprises a base, a stand column, a sliding block, a first swing rod, a second swing rod and a driving hammer, the stand column is vertically installed on the base, the sliding block is installed in the stand column in a sliding mode, one end of the first swing rod is hinged to the sliding block, the other end of the first swing rod is hinged to one end of the second swing rod, and the other end of the second swing rod is connected with the driving hammer; a supporting frame is arranged on one side of the sliding block, one side of the supporting frame is fixedly connected with the sliding block, a first supporting block is arranged on the upper end face of the supporting frame, and the upper portion of the first supporting block abuts against the lower portion of the first swing rod. After the first swing rod and the second swing rod are hinged, the falling point of the driving hammer can be controlled, the hammering force is controlled through the height of the driving hammer, and after the driving hammer hammers the top face of the foundation pile, the bounce kinetic energy of the driving hammer can be consumed through the elastic piece, so that the driving hammer is prevented from hammering the top face of the foundation pile for the second time, and the accuracy of a detection result is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of foundation pile detection, and in particular to a foundation pile stress wave excitation device. Background Art

[0002] During the construction of high-rise buildings, towers and other facilities, it is necessary to set up foundation piles underground to improve the stability of the building. There are many forms of foundation piles, such as cast-in-place piles, bored piles, and prefabricated piles. After the foundation piles are constructed, they are mainly embedded in the ground. In order to detect the condition of the foundation piles, people often use the stress wave reflection method for detection. The operation steps are to apply coupling agent to the probe and fix it on the top surface of the foundation pile, then generate stress waves by hammering the top surface of the foundation pile, and record the vibration waveform through the probe to detect the condition of the foundation pile. Existing stress wave excitation is mainly carried out by the inspector holding a hammer for hammering, and its strength and position are somewhat random, which is easy to affect the detection results. Therefore, people have designed some excitation devices to replace manual hammering. For example, Chinese patent application number 202321009488.5 discloses a foundation pile stress wave reflection method detection excitation device, which guides the heavy hammer through a guide rod so that it falls accurately on the position where excitation is required, and the hammering force can be controlled by the height of the heavy hammer falling. However, when the device is in use, after the heavy hammer falls and hits the bottom plate, it will bounce back and continue to hammer the bottom plate, that is, it is excited multiple times. Although the intensity of the secondary excitation is not high, since the excitation position is close to the probe, it will still have a certain impact on the detection results. Therefore, a foundation pile stress wave excitation device is needed, which has accurate landing point and controllable strength. At the same time, it can prevent the hammer from hitting the pile top for the second time after the first excitation, so as to ensure the accuracy of the detection results. Utility Model Content

[0003] In order to solve the above problems, the present application proposes a foundation pile stress wave excitation device, which has the advantages of accurate landing point and controllable force, and can prevent the hammer from hitting the pile top for the second time after the first excitation, thereby ensuring the accuracy of the detection result.

[0004] This application is implemented through the following technical solutions:

[0005] The present application proposes a foundation pile stress wave excitation device, comprising: a base, a column, a slider, a first pendulum, a second pendulum, and a hammer, wherein the column is vertically installed on the base, the slider is slidably installed in the column, one end of the first pendulum is hinged to the slider, the other end of the first pendulum is hinged to one end of the second pendulum, and the other end of the second pendulum is connected to the hammer; a support frame is provided on one side of the slider, one side of the support frame is fixedly connected to the slider, a first support block is provided on the upper end surface of the support frame, and the upper part of the first support block is close to the lower part of the first pendulum.

[0006] Furthermore, a limit frame is provided at the end of the first swing arm, the limit frame is fixedly connected to the first swing arm, the end of the second swing arm is hinged to the limit frame, a second support block is provided at the lower part of the limit frame, and the upper part of the second support block is close to the lower part of the second swing arm.

[0007] Furthermore, a spring piece is provided in the limiting frame, an opening is provided on one side of the spring piece, and the middle part of the spring piece is circular.

[0008] Furthermore, there are two spring pieces, both of which are installed in the limiting frame, and when the second swing arm rotates to be parallel or perpendicular to the first swing arm, the second swing arm is stuck in the middle of the spring piece.

[0009] Furthermore, a long hole is provided on one side of the column, a screw rod is provided on one side of the slider, one end of the screw rod is connected to the slider, the other end of the screw rod extends out of the long hole, and a nut is provided on the screw rod.

[0010] Furthermore, a counterweight block is provided on the upper part of the hammer. The counterweight block has multiple specifications and is connected to the hammer through threads.

[0011] The beneficial effects of the present application are as follows: after the first rocker arm is hinged with the second rocker arm, the landing point of the hammer can be controlled, and the hammering force can be controlled by the height of the hammer; after the hammer hits the top surface of the foundation pile, the kinetic energy of the hammer's rebound can be consumed by the shrapnel, thereby preventing the hammer from hitting the top surface of the foundation pile for the second time, thereby ensuring the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the utility model;

[0013] Figure 2 It is a structural diagram of the column;

[0014] Figure 3 It is a structural schematic diagram of the limit frame;

[0015] Figure 4 It is a schematic diagram of the structure with the hammer raised;

[0016] In the figure: 1-base, 2-column, 3-slider, 4-first pendulum, 5-second pendulum, 6-hammer, 7-support frame, 8-first support block, 9-limiting frame, 10-second support block, 11-shrapnel, 12-screw, 13-counterweight. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0018] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0019] In addition, the descriptions of "first", "second", etc. in this application are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0020] like Figures 1 to 4 As shown, an embodiment of the utility model provides a foundation pile stress wave excitation device, including: a base 1, a column 2, a slider 3, a first pendulum 4, a second pendulum 5, and a hammer 6. The column 2 is vertically installed on the base 1, and the slider 3 is slidably installed in the column 2. One end of the first pendulum 4 is hinged to the slider 3, and the other end of the first pendulum 4 is hinged to one end of the second pendulum 5, and the other end of the second pendulum 5 is connected to the hammer 6; a support frame 7 is provided on one side of the slider 3, and one side of the support frame 7 is fixedly connected to the slider 3. A first support block 8 is provided on the upper end surface of the support frame 7, and the upper part of the first support block 8 is close to the lower part of the first pendulum 4.

[0021] During the test, after the stress wave sensor is coated with coupling agent, it is installed on the top surface of the foundation pile, and then the vibration excitation device is placed on one side of the foundation pile. Then, the height position of the slider 3 in the column 2 is adjusted so that when the first pendulum 4 and the second pendulum 5 are horizontal, the hammer 6 can just hit the top surface of the foundation pile. After the slider 3 is adjusted, the nut is tightened to fix the slider 3 in the column 2. Then, the second pendulum 5 is adjusted to be stuck in the spring piece 11, and the hammer 6 is moved to the position where the hammer is required. During the vibration, the worker steps on the base 1 to prevent the vibration excitation device from shifting, and then lifts the first pendulum 4. Under the support of the second support block 10 and the limit of the spring piece 11, the second pendulum 5 and the hammer 6 swing synchronously. After the hammer 6 is raised to an appropriate height, the first pendulum 4 is released. Under the action of gravity, the first pendulum 4, the second pendulum 5, and the hammer 6 swing, causing the hammer 6 to fall, converting potential energy into kinetic energy. At the same time, the moving trajectory of the hammer 6 passes through the first pendulum 4 With the second pendulum rod 5 limited, the hammer 6 can accurately hammer to the position where the top surface of the foundation pile needs to be hammered, and the hammering force of the hammer 6 can be controlled by the falling height of the hammer 6. After the hammer 6 hammers to the top surface of the foundation pile, since the lower end of the hammer 6 is made of plastic, under the action of plastic elasticity, the hammer 6 and the second pendulum rod 5 end bounce upward, and the first pendulum rod 4 still moves downward under the action of inertia, so that the second pendulum rod 5 overcomes the clamping of the spring piece 11 and then bounces upward. After the second pendulum rod 5 bounces up, it can be clamped by another spring piece 11, or when the rebound force of the second pendulum rod 5 is small, the second pendulum rod 5 cannot be clamped by another spring piece 11. Since the kinetic energy of the second pendulum rod 5 and the hammer 6 is consumed by the spring piece 11, it is also impossible to overcome the resistance of the spring piece 11 again to hammer the top surface of the foundation pile, thereby preventing the hammer 6 from hammering the top surface of the foundation pile for the second time, avoiding the generation of noise that affects the signal acquisition of the sensor, and ensuring the accuracy of the detection result.

[0022] In a preferred embodiment, a limit frame 9 is provided at the end of the first rocker arm 4, the limit frame 9 is fixedly connected to the first rocker arm 4, the end of the second rocker arm 5 is hinged to the limit frame 9, and a second support block 10 is provided at the lower part of the limit frame 9. The upper part of the second support block 10 is close to the lower part of the second rocker arm 5. The first rocker arm 4 is supported by the first support block 8, and the second rocker arm 5 is supported by the second support block 10, so that when the first rocker arm 4 is lifted, the first rocker arm 4 can drive the second rocker arm 5 and the hammer 6 to move together, and after hammering, the first rocker arm 4 can remain horizontal to prevent the hammer 6 from hammering the top surface of the foundation pile for the second time.

[0023] In a preferred embodiment, a spring sheet 11 is provided in the limit frame 9, an opening is provided on one side of the spring sheet 11, and the middle part of the spring sheet 11 is circular. The middle part of the spring sheet 11 can clamp the second rocker arm 5, and can drive the first rocker arm 4 and the second rocker arm 5 to be lifted together. After the hammer 6 hits the top surface of the foundation pile for the first time, when the hammer 6 rebounds, the kinetic energy of the hammer 6 and the second rocker arm 5 is consumed to prevent the hammer 6 from hitting the top surface of the foundation pile for the second time.

[0024] Specifically, Figure 3 As shown, there are two spring pieces 11, and both spring pieces 11 are installed in the limit frame 9. When the second swing rod 5 rotates to be parallel or perpendicular to the first swing rod 4, the second swing rod 5 is stuck in the middle of the spring piece 11. After the hammer 6 bounces up, the second swing rod 5 will slide out of the first spring piece 11. At this time, two situations will occur. When the speed of the hammer 6 is relatively high, the hammer 6 will drive the second swing rod 5 to be stuck in the second spring piece 11 to prevent the hammer 6 from hammering the foundation pile for the second time. When the speed of the hammer 6 is relatively low, the second swing rod 5 cannot overcome the elastic force of the second spring piece 11, and the second swing rod 5 It cannot be stuck by the second spring piece 11. At this time, the kinetic energy of the rebound of the hammer 6 and the second pendulum rod 5 is consumed by the two spring pieces. When the hammer 6 swings toward the top surface of the foundation pile again under gravity, the kinetic energy of the hammer 6 is small and cannot overcome the elastic force of the first spring piece 11, thereby failing to rotate the second pendulum rod 5 to a horizontal position, so that the hammer 6 finally stays above the foundation pile. By adjusting the thickness of the spring piece 11, the elastic force of the spring piece 11 can be adjusted, so that in both cases it can be ensured that the hammer 6 cannot hit the top surface of the foundation pile for a second time, thereby ensuring the accuracy of the detection result.

[0025] Specifically, Figure 2 As shown, a long hole is provided on one side of the column 2, and a screw rod 12 is provided on one side of the slider 3. One end of the screw rod 12 is connected to the slider 3, and the other end of the screw rod 12 extends out from the long hole. A nut is provided on the screw rod 12 to facilitate the operator to control the height of the slider 3, so that when the first rocker arm 4 and the second rocker arm 5 are horizontal, the hammer 6 can just hammer on the top surface of the foundation pile, so that the vibration excitation device can use foundation piles of different heights.

[0026] Specifically, a counterweight block 13 is provided on the upper part of the hammer 6. The counterweight block 13 has multiple specifications. The counterweight block 13 is connected to the hammer 6 through a thread. The total weight of the hammer 6 can be adjusted by replacing the counterweight blocks 13 of different specifications, so as to adjust the hammering force of the hammer 6 according to the type and size of the foundation pile.

[0027] Of course, the present application may have many other implementations. Based on the present implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present application.

Claims

1. A foundation pile stress wave excitation device, characterized in that: include: A base (1), a column (2), a slider (3), a first swing rod (4), a second swing rod (5), and a hammer (6), wherein the column (2) is vertically mounted on the base (1), the slider (3) is slidably mounted in the column (2), one end of the first swing rod (4) is hinged to the slider (3), the other end of the first swing rod (4) is hinged to one end of the second swing rod (5), and the other end of the second swing rod (5) is connected to the hammer (6); a support frame (7) is provided on one side of the slider (3), one side of the support frame (7) is fixedly connected to the slider (3), a first support block (8) is provided on the upper end surface of the support frame (7), and the upper part of the first support block (8) is closely attached to the lower part of the first swing rod (4).

2. A foundation pile stress wave excitation device according to claim 1, characterized in that: A limiting frame (9) is provided at the end of the first swing rod (4), the limiting frame (9) is fixedly connected to the first swing rod (4), the end of the second swing rod (5) is hinged to the limiting frame (9), a second support block (10) is provided at the lower part of the limiting frame (9), and the upper part of the second support block (10) is closely attached to the lower part of the second swing rod (5).

3. A foundation pile stress wave excitation device according to claim 2, characterized in that: A spring sheet (11) is arranged inside the limiting frame (9), an opening is arranged on one side of the spring sheet (11), and the middle part of the spring sheet (11) is circular.

4. A foundation pile stress wave excitation device according to claim 3, characterized in that: There are two spring sheets (11), both of which are installed in the limiting frame (9). When the second swing rod (5) rotates to be parallel or perpendicular to the first swing rod (4), the second swing rod (5) is stuck in the middle of the spring sheet (11).

5. The foundation pile stress wave excitation device according to claim 1, characterized in that: A long hole is provided on one side of the column (2), a screw rod (12) is provided on one side of the slider (3), one end of the screw rod (12) is connected to the slider (3), the other end of the screw rod (12) extends out of the long hole, and a nut is provided on the screw rod (12).

6. The foundation pile stress wave excitation device according to claim 1, characterized in that: A counterweight block (13) is provided on the upper part of the hammer (6). The counterweight block (13) has multiple specifications and is connected to the hammer (6) via a thread.

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