Drop hammer device for foundation pile high strain detection

Abstract

The utility model provides a drop hammer device for foundation pile high strain detection, which comprises a base and a track, the top of the base is fixedly connected with the track, four corners of the top surface of the base are fixedly connected with stand columns, the top ends of the stand columns are fixedly connected with a top seat, the top surface of the top seat is provided with a speed reducing motor, and the speed reducing motor is connected with the track. The output end of the gear motor is fixedly connected with a first gear, the upper portion of the top seat is movably connected with a main shaft, and the two ends of the main shaft are fixedly connected with traction wheels. The utility model has the advantages that when the speed reducing motor rotates forwards, the layer plate and the falling hammer head move upwards under the action of the traction wheel, the steel wire rope and the traction wheel, the layer plate moves on the track through the guide wheels on the two sides, and due to the limiting action of the track, the layer plate and the falling hammer head can move along the vertical track in a standard way; when the falling hammer head and the laminate fall along the track, the falling hammer head is always coaxial with the pile head of the pile foundation, the coaxiality of the falling hammer head and the pile foundation to be detected can be ensured, and the detection precision can be effectively ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of pile foundation detection, in particular to a drop hammer device for high strain detection of foundation piles. Background Art

[0002] Existing high-strain detection of pile foundations generally adopts the free-fall method of lifting a falling hammer for detection. When the falling hammer falls freely, it will hit the pile head of the building pile foundation. The potential energy of the falling hammer is converted into mechanical energy, and the signal is collected by the sensor to analyze the integrity and bearing capacity of the pile foundation. The sensor for collecting signals is generally installed on the pile body.

[0003] In the prior art, the drop hammer is generally lifted by a crane or an excavator through a steel wire rope. The steel wire rope inevitably shakes when the crane or the excavator is working, which makes it difficult to ensure the coaxiality of the drop hammer and the pile foundation to be tested, resulting in inaccurate positioning of the drop hammer on the pile foundation head, resulting in inaccurate high-strain detection results of the pile foundation. Utility Model Content

[0004] The purpose of the present invention is to solve at least one of the above technical deficiencies.

[0005] Therefore, one purpose of the utility model is to provide a drop hammer device for high strain detection of foundation piles to solve the problems mentioned in the background technology and overcome the shortcomings of the prior art.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the utility model provides a drop hammer device for pile foundation high strain detection, comprising a base and a track, wherein the top of the base is fixedly connected to the track, and the four corners of the top surface of the base are fixedly connected to columns;

[0007] The top of the column is fixedly connected to a top seat, a reduction motor is installed on the top surface of the top seat, a first gear is fixedly connected to the output end of the reduction motor, a main shaft is movably connected to the top of the top seat, both ends of the main shaft are fixedly connected to traction wheels, and a steel wire rope is wound around the outer surface of the traction wheel;

[0008] A plurality of layer plates are movably connected to the inner side of the track, the layer plates are connected to each other, guide wheels are installed on both sides of the layer plates, and the guide wheels are movably connected to the track;

[0009] A drop hammer head is fixedly connected to the bottom of the lowest layer plate;

[0010] The four side surfaces of the base are threadedly connected with a screw rod with a scale, and the outer end of the screw rod with a scale is fixedly connected with a hand wheel;

[0011] A second gear is fixedly connected to the outer surface of the main shaft, and one side of the first gear is movably connected to the second gear;

[0012] A traction wheel is installed above the uppermost layer plate, and the outer surface of the traction wheel is movably connected with the wire rope.

[0013] Preferably, any of the above schemes is that the movable connection surface between the track and the guide wheel is a V-surface, the column is welded to the base, and the top end of the column is welded to the top seat.

[0014] Adopting the above technical solution: This device is specially used for high strain detection of pile foundation, specifically, the falling hammer head freely hammers onto the pile head of the pile foundation after falling.

[0015] Preferably, any of the above schemes is that the reduction motor is arranged horizontally, and the diameter of the first gear is smaller than the diameter of the second gear.

[0016] Adopting the above technical solution: the device can be divided into three parts, the first part is the body part, which is composed of a base, a track, a column, a top seat, a reduction motor, a first gear, a main shaft, a traction wheel, and a wire rope;

[0017] The second part is the drop hammer part, which consists of a layer plate, a guide wheel, and a drop hammer head. The axis of the drop hammer head coincides with the center line of the entire device.

[0018] The third part is the positioning part of the device, which consists of a scaled screw and a handwheel.

[0019] Preferably, any of the above schemes is provided with a through hole for the wire rope to pass through on the top seat, and the main shaft is arranged transversely.

[0020] Adopt the above technical scheme: The core advantages of this device are: designing a new type of drop hammer mechanism and positioning mechanism, the entire device frame is framed from the top around the pile head to be tested, at this time the device does not fall to the ground, it is suspended by a crane, and the hand wheel is used to adjust the scaled screw so that the scales of the two screws on the opposite side are the same, the inner end of the scaled screw abuts the pile head, at this time the center line of the device coincides with the axis of the pile head, and the device falls to the ground smoothly, when the reduction motor rotates forward, the layer plate and the drop hammer head are moved up by the action of the traction wheel, wire rope, and traction wheel, and the layer plate moves on the track through several guide wheels on both sides. Due to the limiting effect of the track, the layer plate and the drop hammer head can move along the vertical track in a standard manner, and the drop hammer head and the layer plate fall along the track. When the drop hammer head and the layer plate fall along the track, the drop hammer head is always coaxial with the pile head, the coaxiality of the drop hammer head and the pile foundation to be tested can be guaranteed, which can effectively guarantee the detection accuracy.

[0021] Preferably, any of the above schemes comprises at least three layers of the layer plates, which are welded to each other.

[0022] Preferably, the guide wheel is a V-wheel, and the axis of the drop hammer is colinear with the center line of the base.

[0023] Preferably, in any of the above schemes, the graduated screw is made of stainless steel.

[0024] Compared with the prior art, the advantages and beneficial effects of the utility model are:

[0025] The drop hammer device for high-strain detection of pile foundation is designed with a new drop hammer mechanism and positioning mechanism. The entire device frame is framed from above around the pile head to be detected. At this time, the device does not fall to the ground but is suspended by a crane. The hand wheel is used to adjust the scaled screw rod so that the scales of the two screw rods on the opposite sides are the same. The inner end of the scaled screw rod abuts the pile head. At this time, the center line of the device coincides with the axis of the pile head. At this time, the device falls to the ground smoothly. When the reduction motor rotates forward, the layer plate and the drop hammer head are moved up by the action of the traction wheel, wire rope and traction wheel. The layer plate moves on the track through several guide wheels on both sides. Due to the limiting effect of the track, the layer plate and the drop hammer head can move along the vertical track in a standard manner. When the drop hammer head and the layer plate fall along the track, the drop hammer head is always coaxial with the pile head. The coaxiality of the drop hammer head and the pile foundation to be tested can be guaranteed, which can effectively ensure the detection accuracy.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 It is a structural schematic diagram of the utility model from the first perspective;

[0029] Figure 2 It is a structural schematic diagram of the utility model from a second viewing angle;

[0030] Figure 3 This is a front view structural schematic diagram of the utility model;

[0031] Figure 4 For this utility model Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0032] In the figure: 1-base, 2-track, 3-column, 4-top seat, 5-reduction motor, 6-first gear, 7-spindle, 8-traction wheel, 9-wire rope, 10-layer plate, 11-guide wheel, 12-drop hammer head, 13-screw with scale, 14-handwheel, 15-second gear, 16-traction wheel. DETAILED DESCRIPTION

[0033] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figure 1-4 As shown, the drop hammer device for pile foundation high strain detection includes a base 1 and a track 2. The top of the base 1 is fixedly connected to the track 2, and the four corners of the top surface of the base 1 are fixedly connected to columns 3;

[0036] The top of the column 3 is fixedly connected to a top seat 4, a reduction motor 5 is installed on the top surface of the top seat 4, a first gear 6 is fixedly connected to the output end of the reduction motor 5, a main shaft 7 is movably connected to the top of the top seat 4, both ends of the main shaft 7 are fixedly connected to traction wheels 8, and a steel wire rope 9 is wound around the outer surface of the traction wheel 8;

[0037] A plurality of layer plates 10 are movably connected to the inner side of the track 2. The layer plates 10 are connected to each other. Guide wheels 11 are installed on both sides of the layer plates 10. The guide wheels 11 are movably connected to the track 2.

[0038] A drop hammer 12 is fixedly connected to the bottom of the bottommost layer 10;

[0039] The four sides of the base 1 are threadedly connected with a graduated screw rod 13, and the outer end of the graduated screw rod 13 is fixedly connected with a hand wheel 14;

[0040] The outer surface of the main shaft 7 is fixedly connected with a second gear 15, and one side of the first gear 6 is movably connected with the second gear 15;

[0041] A traction wheel 16 is installed above the uppermost layer plate 10 , and the outer surface of the traction wheel 16 is movably connected to the wire rope 9 .

[0042] Embodiment 1: The movable connection surface between the track 2 and the guide wheel 11 is a V-surface, the column 3 is welded to the base 1, and the top of the column 3 is welded to the top seat 4. This device is specially used for high strain detection of pile foundations, specifically, the drop hammer head 12 falls and freely hammers onto the pile head of the pile foundation. The reduction motor 5 is arranged horizontally, and the diameter of the first gear 6 is smaller than the diameter of the second gear 15.

[0043] Embodiment 2: This device can be divided into three parts. The first part is the body part, which is composed of a base 1, a track 2, a column 3, a top seat 4, a reduction motor 5, a first gear 6, a main shaft 7, a traction wheel 8, and a wire rope 9;

[0044] The second part is the drop hammer part, which is composed of a layer plate 10, a guide wheel 11, and a drop hammer head 12. The axis of the drop hammer head 12 coincides with the center line of the entire device;

[0045] The third part is the device positioning part, which consists of a graduated screw 13 and a hand wheel 14. A through hole for the wire rope 9 to pass through is provided on the top seat 4, and the main shaft 7 is arranged horizontally. The layer plates 10 are provided with at least three layers, and the layer plates 10 are welded. The guide wheel 11 is specifically a V wheel, and the axis of the drop hammer head 12 is in line with the center line of the base 1. The material of the graduated screw 13 is stainless steel.

[0046] The working principle of the utility model is as follows:

[0047] The entire device frame is framed around the pile head to be tested from above. At this time, the device does not fall to the ground, but is suspended by a crane. The hand wheel 14 is used to adjust the scale screw 13 so that the scales of the two screws on the opposite sides are the same. The inner end of the scale screw 13 abuts against the pile head. At this time, the center line of the device coincides with the axis of the pile head. At this time, the device falls to the ground smoothly, and the scale screw 13 is removed;

[0048] When the reduction motor 5 rotates forward, the traction wheel 8, the wire rope 9, and the traction wheel 16 move the layer plate 10 and the drop hammer 12 upward, and the layer plate 10 moves on the track 2 through a plurality of guide wheels 11 on both sides. Due to the limiting effect of the track 2, the layer plate 10 and the drop hammer 12 can move along the vertical track 2 in a standard manner;

[0049] The weight of the hammer head 12 and the layer plate 10 as a whole is usually more than 10% of the weight of the pile body. The reduction motor 5 unwinds quickly, and the layer plate 10 and the hammer head 12 fall freely along the track 12 and hit the top of the pile foundation, and relative displacement occurs between the pile body and the soil. This process will increase the resistance of the soil at the pile tip and improve the interaction force between the pile body and the soil. The pile body will produce a strain response after being impacted, that is, the deformation of the pile body material when subjected to external force. These strain responses can be captured and recorded by the strain gauge pre-installed on the pile body. The strain gauge is connected to the strain measurement equipment to record the strain data of each measuring point of the pile body during the impact process in real time. The collected strain data is sorted and analyzed, and the pile body integrity parameters and the vertical bearing capacity of a single pile are obtained through a specific calculation program (such as the Case method or the Cap-wape method). According to the analysis results, the integrity and bearing capacity of the pile foundation are evaluated.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] The drop hammer device for high strain detection of pile foundation is designed with a new drop hammer mechanism and positioning mechanism. The entire device frame is framed from above around the pile head to be detected. At this time, the device does not fall to the ground, but is suspended by a crane. The hand wheel 14 is used to adjust the scaled screw 13 so that the scales of the two screws on the opposite sides are the same. The inner end of the scaled screw 13 abuts against the pile head. At this time, the center line of the device coincides with the axis of the pile head. At this time, the device falls to the ground smoothly. When the reduction motor 5 rotates forward, the traction wheel 8, the wire rope 9, and the traction wheel 16 make the layer plate 10 and the drop hammer 12 move upward, and the layer plate 10 moves on the track 2 through a plurality of guide wheels 11 on both sides. Due to the limiting effect of the track 2, the layer plate 10 and the drop hammer 12 can move along the vertical track 2 in a standard manner. When the drop hammer 12 and the layer plate 10 fall along the track 2, the drop hammer 12 is always coaxial with the pile head of the pile foundation. The coaxiality of the drop hammer 12 and the pile foundation to be tested can be guaranteed, which can effectively ensure the detection accuracy.

Claims

1. A drop hammer device for high strain detection of pile foundation, characterized in that: It comprises a base (1) and a track (2), wherein the top of the base (1) is fixedly connected to the track (2), and the four corners of the top surface of the base (1) are fixedly connected to columns (3); The top of the column (3) is fixedly connected to a top seat (4), the top surface of the top seat (4) is equipped with a reduction motor (5), the output end of the reduction motor (5) is fixedly connected to a first gear (6), the top of the top seat (4) is movably connected to a main shaft (7), both ends of the main shaft (7) are fixedly connected to traction wheels (8), and the outer surface of the traction wheel (8) is wound with a steel wire rope (9); the inner side of the track (2) is movably connected to a plurality of layer plates (10), the layer plates (10) are connected to each other, and guide wheels (11) are installed on both sides of the layer plates (10), and the guide wheels (11) are movably connected to the track (2); A drop hammer (12) is fixedly connected to the bottom of the lowermost layer (10); The four side surfaces of the base (1) are threadedly connected with a graduated screw rod (13), and the outer end of the graduated screw rod (13) is fixedly connected with a hand wheel (14); A second gear (15) is fixedly connected to the outer surface of the main shaft (7), and one side of the first gear (6) is movably connected to the second gear (15); A traction wheel (16) is installed above the uppermost layer plate (10), and the outer surface of the traction wheel (16) is movably connected to the steel wire rope (9).

2. A drop hammer device for pile foundation high strain detection as claimed in claim 1, characterized in that: The movable connection surface between the track (2) and the guide wheel (11) is a V-surface, the column (3) is welded to the base (1), and the top end of the column (3) is welded to the top seat (4).

3. A drop hammer device for pile foundation high strain detection as claimed in claim 2, characterized in that: The reduction motor (5) is arranged transversely, and the diameter of the first gear (6) is smaller than the diameter of the second gear (15).

4. A drop hammer device for pile foundation high strain detection as claimed in claim 3, characterized in that: The top seat (4) is provided with a through hole for the steel wire rope (9) to pass through, and the main shaft (7) is arranged transversely.

5. A drop hammer device for pile foundation high strain detection as claimed in claim 4, characterized in that: The layer plates (10) are provided with at least three layers, and the layer plates (10) are welded to each other.

6. A drop hammer device for pile foundation high strain detection as claimed in claim 5, characterized in that: The guide wheel (11) is specifically a V wheel, and the axis of the drop hammer (12) is colinear with the center line of the base (1).

7. A drop hammer device for pile foundation high strain detection as claimed in claim 6, characterized in that: The material of the graduated screw rod (13) is stainless steel.

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