Portable Shear Wave Excitation Device

Abstract

The present invention provides a portable shear wave excitation device, which relates to the technical field of seismic exploration; it includes a mounting plate, an embedded part, a first vibration conduction mechanism, a second vibration conduction mechanism and a percussion backing plate; the embedded part is installed on the bottom surface of the mounting plate and vertically embedded into the soil; the mounting plate is perpendicular to the embedded part; the first vibration conduction mechanism is installed on the top surface of the mounting plate; the second vibration conduction mechanism is installed on the top surface of the mounting plate and is connected to the first vibration conduction mechanism; the percussion backing plate is installed on the second vibration conduction mechanism. The embedded part of the present invention is vertically embedded into the formation, the mounting plate is parallel to the ground, and the vibration is transmitted to the soil through the second vibration conduction mechanism, the first vibration conduction mechanism, the backing plate and the embedded part in sequence by hammering the percussion backing plate, and shear waves can be generated through the embedded part. It not only has a good vibration transmission effect, but also does not require heavy weights to be stacked on the upper part, is convenient to carry and continuously construct on site, improves the low construction efficiency, and avoids the occurrence of safety accidents.

Description

Technical Field

[0001] The invention relates to the technical field of seismic exploration, and in particular to a portable shear wave excitation device. Background Art

[0002] As a traditional geophysical exploration method, seismic exploration is widely used in engineering exploration. Reflection wave seismic exploration is mainly used to determine the thickness and stratification of the Quaternary cover layer, the depth of bedrock and the shape of bedrock surface, and the location, scale, occurrence, and trend of existing adverse geological structures. Seismic exploration includes longitudinal wave exploration and shear wave exploration. In shear wave exploration, the velocity of shallow shear waves is about 1 / 5 to 3 / 5 of the velocity of longitudinal waves. The low velocity and short wavelength of shallow shear waves give them higher resolution.

[0003] In seismic exploration technology, shallow shear wave seismic exploration methods can identify the location of shallow faults, divide different engineering geological zones on the profile, determine the geological structure of the upper loose layer of the Quaternary system, and provide reliable geological basis for urban earthquake prevention planning, earthquake safety evaluation, construction project site selection, foundation treatment, etc., and in conjunction with drilling, it is an effective method for shallow geological surveys and other engineering geological surveys. Shallow shear waves are generated by shear stress, so the excitation of shear waves should try to generate this shear stress.

[0004] There are many existing means of exciting shear waves in engineering surveys, such as having a heavy car press down on a wooden board embedded in the floor trough, and then knocking the two ends of the board horizontally to generate lateral shear force to excite shear waves; or installing a heavy object weighing more than 100KG on the ground to knock on it to excite shear waves; or people standing on heavy objects or iron blocks and hammering them horizontally to generate shear waves.

[0005] The above method requires pressing a car or a human body on the hammered object, or directly hammering a heavy object, which is not conducive to continuous field construction work and has low construction efficiency. Moreover, the use of the human body for stimulation is prone to safety accidents in the case of continuous multi-point operations. Summary of the invention

[0006] The purpose of the present invention is to provide a portable shear wave excitation device to solve the problem that the existing excitation method is not conducive to continuous field construction operations, has low construction efficiency, and is prone to safety accidents.

[0007] In order to solve the above technical problems, the present invention provides a portable shear wave excitation device, and the specific technical solution is as follows:

[0008] A portable shear wave excitation device, comprising a mounting plate, an embedded part, a first vibration conduction mechanism, a second vibration conduction mechanism and a percussion backing plate; the embedded part is installed on the bottom surface of the mounting plate and vertically embedded into the soil; the mounting plate is perpendicular to the embedded part and parallel to the ground; the first vibration conduction mechanism is installed on the top surface of the mounting plate; the second vibration conduction mechanism is installed on the top surface of the mounting plate and is connected to the first vibration conduction mechanism; the percussion backing plate is installed on the second vibration conduction mechanism.

[0009] Further, the first vibration conduction mechanism includes a plurality of first vibration transmission plates arranged in parallel, and adjacent two of the first vibration transmission plates are connected to each other or arranged at intervals.

[0010] Further, from the end far away from the mounting plate to the end close to the mounting plate, the thickness of the first vibration transmission plate gradually increases.

[0011] Further, through holes for ropes to pass through are formed in the first vibration transmission plate.

[0012] Further, the second vibration conduction mechanism includes two second vibration transmission plates, the two second vibration transmission plates are respectively installed at opposite ends of the mounting plate and are connected to the first vibration conduction mechanism; the two percussion backing plates are respectively installed on the two second vibration transmission plates in a one-to-one correspondence.

[0013] Further, the second vibration transmission plate is inclined and installed on the mounting plate in the direction of the first vibration conduction mechanism.

[0014] Further, the included angle between the second vibration transmission plate and the mounting plate is 45° to 65°.

[0015] Further, the embedded part includes a plurality of ground-gripping nails arranged at intervals.

[0016] Further, the ground-gripping nails are arranged in multiple rows, the multiple rows of ground-gripping nails are evenly spaced, and the multiple ground-gripping nails in each row are evenly spaced.

[0017] Further, a hammering mechanism is further included, the hammering mechanism is adjacent to the percussion backing plate or installed on the mounting plate and is used for hammering the percussion backing plate.

[0018] According to the portable shear wave excitation device provided by the present invention, after installation, the embedded part is vertically embedded into the formation. The installation plate is perpendicular to the embedded part and parallel to the ground. By hammering the percussion pad, the vibration is transmitted to the soil body successively through the second vibration conduction mechanism, the first vibration conduction mechanism, the percussion pad and the embedded part, and the shear wave can be quickly generated through the vertical embedded part. It not only has a good vibration transmission effect, but also does not require heavy weights to be piled on the upper part, is convenient to carry and continuously construct on site, improves the low construction efficiency, and avoids the occurrence of safety accidents. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Structural schematic diagram of the portable shear wave excitation device provided by the embodiment of the present invention;

[0021] Figure 2 Bottom view of the portable shear wave excitation device provided by the embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the installation process of the portable shear wave excitation device provided by the embodiment of the present invention;

[0023] Figure 4 Schematic diagram of shear wave excitation (I) of the portable shear wave excitation device provided by the embodiment of the present invention;

[0024] Figure 5 Schematic diagram of shear wave excitation (II) of the portable shear wave excitation device provided by the embodiment of the present invention.

[0025] Icon:

[0026] 1 - Installation plate;

[0027] 2 - Embedded part; 21 - Ground anchor;

[0028] 3 - First vibration conduction mechanism; 31 - First vibration transmission plate; 311 - Through hole;

[0029] 4 - Second vibration conduction mechanism; 41 - Second vibration transmission plate;

[0030] 5 - Percussion pad. Detailed Embodiments

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] Combined with the attached Figure 1 and 2 As shown, this embodiment provides a portable shear wave excitation device, including a mounting plate 1, an embedded part 2, a first vibration conduction mechanism 3, a second vibration conduction mechanism 4, a percussion backing plate 5 and other structures; the above structures are preferably made of metals or alloys with good vibration transmission effects, such as high-grade steel plates are used for all.

[0035] The embedded part 2 of this embodiment is installed on the bottom surface of the mounting plate 1 and is perpendicular to the mounting plate 1. The embedded part 2 is vertically inserted into the soil to facilitate the generation of shear waves. Combined with the attached Figure 3 As shown, during installation, the embedded part 2 of this embodiment is embedded into the formation by hammering (or other means). The embedded part 2 and the mounting plate 1 are preferably welded or integrally formed, so as to ensure the connection stability and vibration transmission effect between the two.

[0036] In this embodiment, both the first vibration conduction mechanism 3 and the second vibration conduction mechanism 4 are installed on the top surface of the mounting plate 1, and the installation method can also be welding; the second vibration conduction mechanism 4 of this embodiment is connected to the first vibration conduction mechanism 3, and the connection method can also be welding, and the first vibration conduction mechanism 3 can be understood as a stabilizing structure of the second vibration conduction mechanism 4. The percussion backing plate 5 of this embodiment is installed on the second vibration conduction mechanism 4, and the installation method can be welding or integral connection.

[0037] When exciting the shear wave, the vibration is transmitted to the soil body in sequence through the percussion of the percussion backing plate 5 by the second vibration conduction mechanism 4, the first vibration conduction mechanism 3, the backing plate and the embedded part 2. Since the embedded part 2 is vertically inserted into the soil body, a shear wave can be generated quickly. This structure not only has a good vibration transmission effect, but also does not require heavy weights to be piled on the upper part, and the weight of the device itself is also relatively light, which is convenient for carrying and continuous on-site construction, improves the low construction efficiency, and avoids the occurrence of safety accidents.

[0038] Combined with the attached Figure 1 As shown, the first vibration conduction mechanism 3 includes a plurality of first vibration transmission plates 31 arranged in parallel. Adjacent two first vibration transmission plates 31 are connected to each other or arranged at intervals, and preferably adjacent two first vibration transmission plates 31 are connected to each other to improve the conduction performance.

[0039] As a preferred implementation manner of this embodiment, in order to improve the structural strength and vibration transmission performance of the mounting plate 1, from the end of the first vibration transmission plate 31 far from the mounting plate 1 to the end close to the mounting plate 1, the thickness of the first vibration transmission plate 31 gradually increases, that is, the cross-sectional shape of the first vibration transmission plate 31 is trapezoidal, specifically it can be an isosceles trapezoid.

[0040] As a preferred implementation manner of this embodiment, the portable shear wave excitation device of this embodiment may further include a rope (not shown in the figure). Correspondingly, through holes 311 for the rope to pass through are provided on the first vibration transmission plate 31 of this embodiment. The number of the through holes 311 can be multiple as shown in the figure. By passing the rope through the through holes 311, the rope can form a closed structure for transporting the portable shear wave excitation device of this embodiment, improving the portability of the device.

[0041] As a preferred implementation manner of this embodiment, the second vibration conduction mechanism 4 of this embodiment includes two second vibration transmission plates 41. The two second vibration transmission plates 41 are respectively installed at opposite ends of the mounting plate 1. One of the second vibration transmission plates 41 is connected to one end of the first vibration conduction mechanism 3, that is, connected to one end of the plurality of above-mentioned first vibration transmission plates 31; the other second vibration transmission plate 41 is connected to the other end of the first vibration conduction mechanism 3, that is, connected to the other end of the plurality of above-mentioned first vibration transmission plates 31; two percussion backing plates 5 are correspondingly installed on the two second vibration transmission plates 41.

[0042] Combined with the attached Figure 4 and 5 As shown, the second vibration conduction mechanism 4 of this structure can excite shear waves in two directions that are 180° apart from each other, respectively generating two S waves with a phase difference of 180°, so as to improve the excitation efficiency.

[0043] As a preferred implementation manner of this embodiment, the second vibration transmission plate 41 of this embodiment is inclined and installed on the mounting plate 1 in the direction of the first vibration conduction mechanism 3, so that the second vibration transmission plate 41 and the mounting plate 1 can form an included angle, and the included angle is determined through experiments according to the density of the formation; and the two second vibration transmission plates 41 are in a symmetric structure.

[0044] As a preferred implementation manner of this embodiment, the inventor found through experiments that when the included angle formed by the second vibration transmission plate 41 and the mounting plate 1 is 45° - 65°, it can adapt to most formations and has good applicability.

[0045] As a preferred implementation manner of this embodiment, the embedded part 2 of this embodiment includes a plurality of ground-gripping nails 21 arranged at intervals. In order to ensure the stability of installation and the uniformity of conduction, the ground-gripping nails 21 of this embodiment are arranged in multiple rows (for example, three rows as shown in the figure), the multiple rows of ground-gripping nails 21 are evenly spaced, and the multiple ground-gripping nails 21 in each row are evenly spaced.

[0046] Of course, the structural form of the embedded part 2 of this embodiment is not limited to this. For example, holes can be drilled in the mounting plate 1, and the entire device can be fixed to the ground through long nails (this structural form is not shown in this embodiment).

[0047] Based on the above structure, the portable shear wave excitation device of this embodiment further includes a hammering mechanism (not shown in the figure). The hammering mechanism is separated from and adjacent to the percussion backing plate 5, or is directly installed on the mounting plate 1 and is used to hammer the percussion backing plate 5; the structural form of the hammering mechanism of this embodiment can be designed by imitating the hammering structure of an existing pile driver, and the hammer body is driven to move by a motor or an oil cylinder. This embodiment will not describe it in too much detail.

[0048] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A portable shear wave excitation device, characterized in that, it includes a mounting plate, an embedded part, a first vibration conduction mechanism, a second vibration conduction mechanism and a percussion backing plate; the embedded part is installed on the bottom surface of the mounting plate and vertically embedded into the soil body; the mounting plate is perpendicular to the embedded part and parallel to the ground; the first vibration conduction mechanism is installed on the top surface of the mounting plate; the second vibration conduction mechanism is installed on the top surface of the mounting plate and connected to the first vibration conduction mechanism; the percussion backing plate is installed on the second vibration conduction mechanism; the first vibration conduction mechanism includes a plurality of first vibration plates arranged in parallel, and adjacent two of the first vibration plates are connected to each other or arranged at intervals; from the end far away from the mounting plate to the end close to the mounting plate, the thickness of the first vibration plate gradually increases; through holes for ropes to pass through are formed in the first vibration plate; the second vibration conduction mechanism includes two second vibration plates, the two second vibration plates are respectively installed at opposite ends of the mounting plate and connected to the first vibration conduction mechanism; the two percussion backing plates are correspondingly installed on the two second vibration plates; the second vibration plate is inclined and installed on the mounting plate in the direction of the first vibration conduction mechanism; the included angle between the second vibration plate and the mounting plate is 45° - 65°.

2. The portable shear wave excitation device according to claim 1, characterized in that, the embedded part includes a plurality of spaced ground nails.

3. The portable shear wave excitation device according to claim 2, characterized in that, the ground nails are arranged in multiple rows, the multiple rows of ground nails are evenly spaced, and the multiple ground nails in each row are evenly spaced.

4. The portable shear wave excitation device according to any one of claims 1 - 3, characterized in that, it further includes a hammering mechanism, the hammering mechanism is adjacent to the percussion backing plate or installed on the mounting plate and is used for hammering the percussion backing plate.

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