Transient surface wave method seismic source excitation device

Abstract

The utility model discloses a transient surface wave method seismic source excitation device, and belongs to the field of field ground wave testing devices in engineering investigation. A transient surface wave method seismic source excitation device is structurally characterized in that a connecting rod is fixedly mounted on a base, a hand-operated winch is arranged in the middle of the connecting rod, a steel wire rope is wound on the winch, a pulley supporting rod is fixedly mounted at the upper end of the connecting rod, a fixed pulley is fixedly mounted on the pulley supporting rod, and the steel wire rope bypasses the fixed pulley and is fixedly connected with a detacher. The upper end of the guide rod penetrates through the drop hammer, the lower end of the guide rod is inserted into the excitation plate, and the diameter of the upper portion of the guide rod is smaller than that of the lower portion of the guide rod. The device is convenient to transport, disassemble and assemble, can be moved at any time, is high in multi-point seismic source excitation efficiency, is low in cost, and is more suitable for shallow engineering investigation.

Description

Technical Field

[0001] The utility model relates to a field ground wave testing device for engineering survey, in particular to a transient surface wave method source excitation device, which can achieve stable excitation energy by controlling a falling hammer and a height. Background Art

[0002] Surface wave testing technology is an in-situ testing method with the advantages of high efficiency and non-destructiveness. It is commonly used to delineate stratum and overburden thickness, detect underground cavities and goafs, and test the effectiveness of foundation reinforcement. Surface waves are a type of Rayleigh wave, often referred to as "ground roll." By deploying a series of detectors on the ground and exciting them remotely, a set of surface wave data is generated. Spectral and phase analysis of this surface wave data reveals subsurface information. Good data requires a stable excitation source.

[0003] When testing surface waves on-site, manual excitation is often used, using a hammer to strike the excitation plate. However, the energy of manual excitation is low, the detection depth is shallow, and due to human factors, the energy of each excitation is inconsistent due to physical strength and individual differences, resulting in unstable energy. Furthermore, the weight of the hammer during each excitation requires a high level of physical fitness from the excitation operator, which also poses certain risks.

[0004] Electric excitation devices are often powered by large machinery or preloading devices, but they are expensive, bulky, and cannot be disassembled, requiring specialized vehicles for transportation. A Chinese patent, patent number 202420175735.7, discloses a modular vibration source generator for transient surface wave detection. The device consists of a detachable winch 1, a power supply 2, a pulley 4, a decoupler 5, a modular steel gantry, an excitation plate 9, and an excitation drop hammer 8. Each component is disassembled and transported to the site for installation and commissioning. This complex installation and commissioning process is costly and bulky, making it unsuitable for special working environments such as mountainous areas. It requires a stable power supply and lacks the ability to be moved at any time. Summary of the Invention

[0005] The present invention is to solve the above technical problems and provides a transient surface wave method source excitation device. The present invention is easy to transport and disassemble, can be moved at any time, has high efficiency and low cost for multi-point source excitation, and is more suitable for shallow engineering surveys.

[0006] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0007] The transient surface wave method source excitation device has the following structure: a connecting rod is fixedly installed on the base, a hand-cranked winch is provided in the middle of the connecting rod, a wire rope is wound around the winch, a pulley support rod is fixedly installed on the upper end of the connecting rod, a fixed pulley is fixedly installed on the pulley support rod, the wire rope passes around the fixed pulley and is fixedly connected to the unhooker, the unhooker is connected to the drop hammer, the upper end of the guide rod passes through the drop hammer, the lower end of the guide rod is inserted into the excitation plate, and the upper diameter of the guide rod is smaller than the lower diameter.

[0008] Preferably, the connecting rod is arranged in sections, and each section of the connecting rod is connected by a screw thread.

[0009] Preferably, the guide rod is arranged in sections, and the connecting rods of each section are connected by screw threads.

[0010] Preferably, two fixed pulleys are fixedly mounted on the pulley support rod.

[0011] Preferably, the base is a V-shaped structure, which is composed of two metal rods fixed together, a connecting rod fixedly installed at the upper end of the connection between the two metal rods, and a support rod is provided between the two metal rods and between the metal rod and the connecting rod.

[0012] Preferably, a universal wheel is provided at the bottom of each end of the two metal rods of the base, and a universal wheel is also provided at the lower end of the connection between the two metal rods.

[0013] Preferably, the excitation plate is a 300×300 mm aluminum plate, the center point of which penetrates the guide rod.

[0014] Preferably, the structure of the above-mentioned winch is as follows: a winch bracket is installed on the connecting rod, the winch bracket is provided with a rocker arm, the rocker shaft of the rocker arm is inserted into the winch bracket, a small gear is fixedly installed on the rocker shaft, the small gear is engaged with the large gear, the large gear is fixedly installed on the rotating shaft, the rotating shaft is installed in the winch bracket, and the wire rope is wound around the rotating shaft.

[0015] Preferably, the hoisting bracket is fixed to the connecting rod via a ring-shaped connecting piece.

[0016] Preferably, the steel wire rope passes around the fixed pulley and is divided into two strands through a triangular bracket and fixedly connected to the unhooking device.

[0017] Due to the adoption of the above technical solution, the utility model has the following advantages and effects:

[0018] Surface wave testing is a crucial task in engineering investigations. The accuracy of numerical values ​​is crucial for the delineation of rock and soil overburden and the physical properties of the soil. This device can be easily transported, assembled, and disassembled, allowing for immediate mobility. It provides excellent surface wave excitation results at varying depths, is highly efficient for multi-point source excitation, and offers low cost, making it particularly suitable for shallow-level engineering investigations and suitable for specialized environments such as mountainous areas.

[0019] The connecting rod and guide rod can be configured in multiple sections to meet the needs of different excitation heights. This device can be equipped with two ordinary workers on site to complete the excitation, reducing the labor intensity of the workers and ensuring stable excitation energy. Pulleys are installed on flat sites for more convenient and labor-saving movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of the utility model.

[0021] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure of the middle winch position.

[0022] In the figure, 1, base, 2, connecting rod, 3, winch, 4, wire rope, 5, pulley support rod, 6, fixed pulley, 7, triangular bracket, 8, unhooking device, 9, drop hammer, 10, guide rod, 11, excitation plate, 12, universal wheel, 13, support rod, 301, winch bracket, 302, rocker arm, 303, rocking shaft, 304, small gear, 305, large gear, 306, rotating shaft, 307, annular connector. DETAILED DESCRIPTION

[0023] The following embodiments are only specific embodiments of the present invention. In order to make the purpose, technical solutions and advantages of the present invention clear at a glance, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The protection scope of the present invention is not limited by the embodiments.

[0024] like Figure 1 As shown, the transient surface wave method seismic source excitation device of the present invention has the following structure: a connecting rod 2 is fixedly mounted on the base 1, a hand-cranked winch 3 is provided in the middle of the connecting rod 2, a steel wire rope 4 is wound on the winch 3, a pulley support rod 5 is fixedly mounted on the upper end of the connecting rod 2, two fixed pulleys 6 are fixedly mounted on the pulley support rod 5, the steel wire rope 4 passes around the two fixed pulleys 6 and is divided into two strands through a triangular bracket 7 and is fixedly connected to a decoupler 8, the decoupler 8 is connected to a drop hammer 9, the upper end of a guide rod 10 passes through the drop hammer 9, the lower end of the guide rod 10 is inserted into an excitation plate 11, and the upper diameter of the guide rod 10 is smaller than the lower diameter.

[0025] like Figure 1 The guide rod 10 is a multi-section structure, with each section screwed together. The connecting rod 2 is also a multi-section structure, with each section screwed together. This allows the height of the entire device to be adjusted.

[0026] like Figure 1The base 1 shown is a V-shaped structure, consisting of two metal rods fixed together. A connecting rod 2 is fixed to the upper end of the connection between the two rods. Support rods 13 are installed between the two rods and between the metal rods and the connecting rod 2 to enhance stability. The three support rods 13 form a triangular structure. Universal wheels 12 are installed at the bottom of each end of the two rods, and another universal wheel 12 is installed at the lower end of the connection between the two rods. This facilitates movement.

[0027] like Figure 1 As shown, the excitation plate 11 is preferably an aluminum plate measuring 300 x 300 mm, with its center point penetrating the guide rod 10. Aluminum is used for excitation because it has relatively low rigidity, resulting in a stable excitation effect after being struck by the drop hammer 9. The decoupler 8 and drop hammer 9 utilize existing structures.

[0028] like Figure 2 As shown, the structure of the hoist 3 is as follows: a hoist bracket 301 is mounted on the connecting rod 2. The hoist bracket 301 is provided with a rocker arm 302. The rocker shaft 303 of the rocker arm 302 penetrates into the hoist bracket 301. A small gear 304 is fixedly mounted on the rocker shaft 303. The small gear 304 meshes with a large gear 305. The large gear 305 is fixedly mounted on a rotating shaft 306. The rotating shaft 306 is mounted in the hoist bracket 301. The wire rope 4 is wound around the rotating shaft 306. The hoist bracket 301 is fixed to the connecting rod 2 via an annular connector 307.

[0029] The rocking arm 302 is manually shaken, and the rocking arm 302 drives the rocking shaft 303 to rotate. The small gear 304 on the rocking shaft 303 rotates to drive the large gear 305 to rotate, and the large gear 305 rotates to drive the rotating shaft 306 to rotate, so that the wire rope 4 wound thereon can be retracted and released.

[0030] The drop hammer 9 is made of metal and can be replaced at any time according to the test depth, ranging from 10kg to 50kg. The upper part of the drop hammer is provided with a decoupler 8. When the drop hammer is lifted to a certain height, it is automatically triggered and falls.

[0031] The working principle of this utility model is as follows:

[0032] During operation, all parts need to be connected. After the hand-cranked hoist 3 is installed, the drop hammer 9 is manually cranked to the top through the hoist 3, and automatically falls and hits the aluminum plate to complete the excitation. Depending on the depth of the surface wave test, different weight drop hammers are replaced.

[0033] The working process of the winch 3 is as follows: manually shake the rocker arm 302, the rocker arm 302 drives the rocker shaft 303 to rotate, the small gear 304 on the rocker shaft 303 rotates to drive the large gear 305 to rotate, and the large gear 305 rotates to drive the rotating shaft 306 to rotate, so that the wire rope 4 wound thereon can be retracted and released.

[0034] The working principle of the unhooker 8 and the drop hammer: The lower end of the wire rope 4 is fixedly connected to the unhooker 8. The unhooker is flanked by a stopper and steel balls of different sizes (the existing commercial structure). The small steel ball is at the bottom and the large steel ball is at the top. As the rope is pulled upward, the small steel ball is aligned with the center of the large steel ball. The stopper controls the lifting height. The large steel ball is squeezed by the small steel balls to the edge of the stopper, and a portion of the protrusion is locked with the drop hammer. As the rope is pulled further, the drop hammer is lifted. When the rope reaches the narrowing section at the top of the guide rod 10, the small steel ball is no longer squeezed by the thick section of the guide rod. The large steel ball on the left side is squeezed laterally and pushed to the edge of the other end of the stopper. At this time, the drop hammer no longer has the large steel ball to hold it in place and will automatically fall. When the drop hammer falls to the bottom, the limiter is lowered and the small steel ball returns to the bottom. Without the squeezing of the small steel ball, the large steel ball will retract into the inside when passing the drop hammer. After reaching the bottom, it will be lifted upward and then clamped to the drop hammer again.

[0035] The above-described embodiments are only preferred specific implementation methods of the present invention, and the protection scope of the present invention is not limited thereto. Any simple changes or equivalent replacements of the technical solutions that can be obviously obtained by any technician familiar with the field within the technical scope disclosed in the present invention fall within the protection scope of the present invention.

Claims

1. A transient surface wave method source excitation device, characterized in that: A connecting rod (2) is fixedly mounted on the base (1), a hand-cranked winch (3) is provided in the middle of the connecting rod (2), a steel wire rope (4) is wound around the winch (3), a pulley support rod (5) is fixedly mounted on the upper end of the connecting rod (2), a fixed pulley (6) is fixedly mounted on the pulley support rod (5), the steel wire rope (4) passes around the fixed pulley (6) and is fixedly connected to the unhooking device (8), the unhooking device (8) is connected to the drop hammer (9), the upper end of the guide rod (10) passes through the drop hammer (9), the lower end of the guide rod (10) is inserted into the excitation plate (11), and the upper diameter of the guide rod (10) is smaller than the lower diameter; the connecting rod (2) is arranged in sections, and each section of the connecting rod is connected by screws. The guide rod (10) is arranged in sections, and the connecting rods of each section are connected by screw threads. The structure of the hoist (3) is as follows: a hoist bracket (301) is installed on the connecting rod (2), a rocker arm (302) is provided on the hoist bracket (301), a rocker shaft (303) of the rocker arm (302) penetrates into the hoist bracket (301), a small gear (304) is fixedly installed on the rocker shaft (303), the small gear (304) is meshed with a large gear (305), the large gear (305) is fixedly installed on a rotating shaft (306), the rotating shaft (306) is installed in the hoist bracket (301), and the wire rope (4) is wound around the rotating shaft (306).

2. The transient surface wave method source excitation device according to claim 1, characterized in that Two fixed pulleys (6) are fixedly mounted on the pulley support rod (5).

3. The transient surface wave method source excitation device according to claim 1, characterized in that The base (1) is a V-shaped structure, which is composed of two metal rods fixed together, the connecting rod (2) is fixedly installed at the upper end of the connection between the two metal rods, and a support rod (13) is provided between the two metal rods and between the metal rod and the connecting rod (2).

4. The transient surface wave method source excitation device according to claim 1 or 3, characterized in that A universal wheel (12) is provided at the bottom of each end of the two metal rods of the base (1), and a universal wheel (12) is also provided at the lower end of the connection between the two metal rods.

5. The transient surface wave method source excitation device according to claim 1 or 3, characterized in that The excitation plate (11) is a 300×300 mm aluminum plate, the center point of which penetrates the guide rod (10).

6. The transient surface wave method source excitation device according to claim 1, characterized in that The hoisting bracket (301) is fixed to the connecting rod (2) via a ring-shaped connecting piece (307).

7. The transient surface wave method source excitation device according to claim 1, characterized in that The steel wire rope (4) passes around the fixed pulley (6) and is divided into two strands through the triangular bracket (7) and fixedly connected to the unhooking device (8).

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