A coupling frame for measuring steady-state surface wave wavelength based on vibration detector

Abstract

The present invention aims to provide a coupling frame for measuring the wavelength of a steady-state surface wave based on a vibrating geophone, comprising a vibrating geophone, a vibrating geophone bracket, and a truss. The vibrating geophone bracket comprises a central circular ring extending from two ends, each end being provided with a set of threaded rods and level adjustment nuts, an I-shaped component being provided below the threaded rods, a spring structure being provided on the threaded rods between the I-shaped component and the ends of the circular ring, a level being provided on the inner sides of the two level adjustment nuts, a hole being provided on the circular ring for fixing the vibrating geophone, and the vibrating geophone bracket being mounted on the truss. The present invention enables simpler installation of the vibrating geophone, easier level adjustment (based on the measurement site), more convenient adjustment of the horizontal distance, and clearer distance reading, thereby reducing the operational complexity of steady-state surface wave wavelength measurement and improving the accuracy of steady-state surface wave exploration results.

Description

Technical Field

[0001] The present invention relates to a geological exploration device, in particular to a steady-state surface wave exploration device. Background Art

[0002] When conducting geological exploration and research, conventional drilling methods are often difficult to carry out due to limitations in geology, landforms, and the natural environment. Therefore, surface wave exploration methods in geological exploration have attracted much attention. Surface wave exploration methods in geological exploration generally refer to methods that use Rayleigh waves for exploration. By measuring the dispersion characteristics of surface waves, geological structures can be inverted. Depending on the source of the excitation, surface wave exploration is divided into three types: steady-state method, transient method, and passive method. The passive method relies solely on environmental noise and is not widely used. The transient method uses a hammering method to generate surface wave signals. The vibration detectors used for reception often need to form a dense, uniform linear array, which is relatively expensive.

[0003] Steady-state surface wave exploration uses a computer-controlled vibrator to generate a continuous single-frequency signal, which is then received by a single vibrating geophone. The geophone is moved to detect signals at different propagation distances. When the distance is an integer multiple of the wavelength corresponding to the excitation frequency, the oscilloscope will display the source and received signals as being in phase. Since the steady-state method uses only a single geophone, it is significantly less expensive than the transient method. However, this method comes with the inconvenience of moving the geophone and issues with distance measurement accuracy. The article "Application of Steady-State Surface Waves in Soft Soil Exploration" introduces a GDS continuous surface wave system developed by GDS Instrument Ltd. in the UK, but does not address the aforementioned operational difficulties. Summary of the Invention

[0004] The object of the present invention is to provide a steady-state surface wave wavelength measurement coupling frame based on a vibration detector, which can realize a more convenient operation and wider application of a steady-state surface wave exploration method.

[0005] The object of the present invention is achieved like this:

[0006] The present invention provides a coupling frame for measuring steady-state surface wave wavelength based on a vibration detector, which is characterized by comprising a vibration detector, a vibration detector bracket, and a truss. The vibration detector bracket comprises a circular ring in the middle, the circular ring extending into two ends, each end being provided with a group of threaded rods and horizontal adjustment nuts, an I-shaped component being provided below the threaded rods, a spring structure being sleeved on the threaded rods between the I-shaped component and the ends of the circular ring, a level being provided on the inner sides of the two horizontal adjustment nuts, a hole being provided on the circular ring for fixing the vibration detector, and the vibration detector bracket being mounted on the truss.

[0007] The present invention may also include:

[0008] 1. An I-shaped hollow is set inside the truss, which matches the shape of the I-shaped component, and the I-shaped component is installed in the I-shaped hollow.

[0009] 2. A ruler is set on the outside of the truss and a pointer is set on the I-shaped component.

[0010] 3. Adjustable vibration-damping rubber pads are set at the bottom of the truss.

[0011] The advantages of the present invention are:

[0012] 1. The present invention can effectively reduce the error in the wavelength of artificial surface waves through a slide rail structure with a scale or a matching electronic distance measuring device, which helps to improve the accuracy of surface wave exploration results;

[0013] 2. The vibrating detector bracket of the present invention is designed with a horizontal adjustment function. It only needs to be adjusted once when the device is deployed. There is no need to adjust the vibrating detector again within the entire truss length. This effectively reduces the complexity of the surface wave exploration method and ensures that the measurement plane of any component sensor of the vibrating detector remains parallel during the exploration process.

[0014] 3. The present invention is designed with a vibration-damping rubber foot pad with adjustable height, which has the functions of reducing the transmission of vibration signals through the device structure and adapting to small-scale unevenness of the ground at the exploration site, making the present invention more applicable.

[0015] 4. The support portion of the vibration detector of the present invention is equipped with a vibration reduction device for isolating the vibration signal transmitted to the vibration detector through the truss component;

[0016] 5. The longer truss structure ensures that measurements can be made directly and correctly along the direction of surface wave propagation when measuring on inclined sites, avoiding the trouble of tilt correction after GPS ranging and the difficulty of measuring the tilt itself, such as Figure 7 ;

[0017] 6. After being laid out, the device of the present invention is parallel to the surface of the measurement site, which can avoid measurement errors caused by small-scale unevenness of the surface introduced artificially along the measurement distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention;

[0019] Figure 2 It is the front view of the present invention;

[0020] Figure 3 is a side view of the present invention;

[0021] Figure 4 A top view of the present invention;

[0022] Figure 5This is a schematic diagram of the vibration detector bracket;

[0023] Figure 6 This is a schematic diagram of the ruler and reading pointer;

[0024] Figure 7 Schematic diagram for measurement on a sloping site. DETAILED DESCRIPTION

[0025] The present invention will be described in more detail below with reference to the accompanying drawings:

[0026] Combine Figure 1-7 The overall structure of the steady-state surface wave exploration device is as follows: Figure 1 As shown in FIG, it is composed of a vibration detector bracket 1, a truss with a slide rail 2, a vibration-damping foot pad 3, and a vibration detector 4. The front view, side view, and top view of the overall structure are as follows: Figure 2 、 Figure 3 and Figure 4 shown.

[0027] Vibration detector bracket 1 Figure 5 The overall shape is a hollow cylinder, and three holes 15 for fixing the vibration detector are distributed in an equilateral triangle on the upper surface of the ring with the center of the circle as the center, so that the vibration detector 4 can be fixed to the circular ring part of the vibration detector bracket 1 with bolts; the ring is provided with horizontal adjustment nuts 12 and threaded rods on both sides, and the matching spring structure 13 is inserted into the threaded rod, and the position can be transferred to the vibration isolation component; there is a spirit level 11 for indicating the horizontal state between the adjustment nut 12 and the circular ring part; the lower end of the threaded rod is provided with an "I-shaped" part 14 for connecting to the truss 2 with a slide rail.

[0028] The scale and reading pointer of the exploration device are as follows Figure 6 As shown, the scale is located outside the slide-rail truss 2, and the pointer is located on the "I-shaped" piece 14 of the geophone bracket 1. The two work together to read the distance indication; electronic distance measuring equipment can also be installed in this area. This slide-rail structure (or electronic device) with a scale effectively reduces errors compared to traditional manual measurement and improves the accuracy of surface wave exploration results.

[0029] Schematic diagram of the use of exploration equipment Figure 1 The structural diagram is similar to that of Figure 1 As shown, first place the truss 2 with slide rails at the site to be surveyed. Adjust the vibration-damping rubber feet 3 to ensure that the truss 2 is as horizontal as possible (relative to the measurement site), with the feet 3 in contact with the ground surface as much as possible. The vibration-damping feet 3 under the truss 2 and the vibration isolation components on the geophone bracket 1 significantly minimize errors caused by vibration signals transmitted through the device structure, while also adapting to small-scale unevenness and other unique terrain conditions at the survey site.

[0030] After the truss 2 is horizontal and stable, insert the "I-shaped" piece 14 of the vibration detector bracket into the slide rail, and then insert the spring 13 into the threaded rod of the "I-shaped" piece 14; fix the vibration detector 4 to the annular part of the bracket with bolts through the hole 15; finally, tighten the horizontal adjustment nut 12 and observe the two spirit levels 11 at the same time, so that the vibration detector 4 remains horizontal while the front part of the tapered rod is inserted into the soil layer and does not affect the sliding of the bracket along the track. The horizontal adjustment function designed for the vibration detector bracket of the present invention is simpler than other ice detector horizontal adjustment methods. It only needs to be adjusted once when the device is deployed. There is no need to adjust the vibration detector level again within the entire truss length, which effectively reduces the complexity of the detector installation operation and surface wave exploration and measurement operation; at the same time, it ensures that any component of the vibration detector is parallel to the sensor measurement plane during the exploration process.

[0031] During the exploration process, the distance between the receiving point and the sound source is changed by sliding the vibrometer bracket 1. When the sound source and the received signal are in phase, a reading is taken at the corresponding position of the scale pointer. This sliding rail structure with a scale, or when combined with electronic equipment, effectively reduces manual measurement errors and helps improve the accuracy of surface wave exploration results. By varying the source excitation frequency and repeating this process, the surface wave dispersion characteristics can be directly determined. Therefore, the use of a vibrometer-based state surface wave exploration device can achieve simpler operation, higher measurement accuracy, and wider application of the steady-state surface wave exploration method.

[0032] The present invention has the following characteristics: the vibration detector bracket 1 has an "I-shaped" component 14 for connecting to the truss 2; the vibration detector bracket 1 has an adjusting nut 12 and a matching spring structure 13 for adjusting the level (based on the measurement site), and a spirit level 11 for indicating the horizontal state; the vibration detector bracket 1 has a hole 15 for fixing the vibration detector 4; the annular component of the vibration detector bracket 1 is equipped with a vibration-damping pad 3 for isolating vibration from the "I-shaped" component 14, and other vibration-damping components can also be installed; the vibration detector bracket 1 has a pointer for cooperating with the truss 2 to read the distance indication; the truss 2 is marked with a distance scale; the vibration detector bracket 1 and the truss 2 can also be installed with an electronic distance measuring device to improve measurement accuracy and reduce operation difficulty; the truss 2 is equipped with a rubber foot pad 3 with a vibration-damping function.

[0033] The steps for using the coupling stand for measuring steady-state surface wave wavelengths based on a vibrometer are as follows: First, place the truss 2 with slide rails at the site to be surveyed. Adjust the vibration-damping rubber feet 3 so that the truss 2 is as horizontal as possible relative to the survey site and the feet 3 are in contact with the ground surface as much as possible. Next, insert the "I-shaped" piece 14 of the vibrometer bracket 1 into the slide rails, and then insert the spring 13 into the threaded rod 14 of the "I-shaped" piece. The vibrometer 4 is bolted to the annular component of the bracket 1, which is then fitted onto the threaded rod of the "I-shaped" piece 14. Finally, tighten the leveling nut 12 while simultaneously observing two spirit levels 11, ensuring that the vibrometer 4 remains horizontal while the tapered rod partially penetrates the soil layer without affecting the bracket's sliding along the rails. During the survey, the distance between the receiving point and the sound source is changed by sliding the vibrometer bracket 1. When the sound source and received signals are in phase, a reading can be taken at the corresponding position of the scale pointer (or using a matching electronic distance measuring device). By varying the source excitation frequency and repeating this process, the surface wave dispersion characteristics can be directly obtained. It is important to note that due to the inaccurate measurement of the distance between the sound source and the coupling frame, a distance of one or several times the wavelength is used as the starting point for the measurement and the distance difference is calculated.

Claims

1. A coupling frame for measuring steady-state surface wave wavelength based on a vibration detector, characterized by: The invention comprises a vibration detector, a vibration detector bracket, and a truss. The vibration detector bracket comprises a central ring, the ring extending to two ends, each end being provided with a set of threaded rods and level adjustment nuts, an I-shaped component being provided below the threaded rods, a spring structure being sleeved on the threaded rods between the I-shaped component and the ends of the rings, a level being provided on the inner sides of the two level adjustment nuts, and a hole being provided on the rings for fixing the vibration detectors; An I-shaped slide rail is provided inside the truss to match the shape of the I-shaped component, and the I-shaped component is installed in the I-shaped slide rail; a ruler is provided outside the truss, and a pointer is provided on the I-shaped component.

2. The coupling frame for measuring steady-state surface wave wavelength based on a vibration detector according to claim 1, characterized in that: Adjustable vibration-damping rubber feet are provided at the bottom of the truss.

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