A device for improving grounding resistance in magnetotelluric sounding in desert areas

Abstract

The present invention discloses a device for improving the grounding resistance in magnetotelluric sounding in desert areas, which relates to the technical field of magnetotelluric sounding. The device includes a water supply tank, a water supply ring cylinder, a ring cover and a sunshade. The water supply ring cylinder is configured to be placed in an electrode pit. The water supply ring cylinder includes an inner cylinder and an outer cylinder sleeved outside the inner cylinder. An annular space is formed between the inner cylinder and the outer cylinder, and an anti-blocking material is filled in the annular space. The inner cylinder is filled with a grounding filler, and electrodes are buried in the grounding filler. A plurality of water permeable holes are provided on the side wall of the inner cylinder. The ring cover covers the upper end port of the annular space, and the lower end of the annular space is closed. A water supply switch is provided at the bottom of the water supply tank, and the water supply switch is communicated with the annular space through a water pipe. The sunshade is used to cover above the water supply ring cylinder to shield the grounding filler. The device for improving the grounding resistance in magnetotelluric sounding in desert areas provided by the present invention can obtain a stable grounding resistance in an electrode pit with a conventional volume, reduce the construction cost and improve the work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic sounding, and in particular to a device for improving the grounding resistance of magnetotelluric sounding in desert areas. Background Art

[0002] In magnetotelluric sounding work, data of the alternating electric field of the natural field source is obtained by measuring the potential difference between dipoles composed of non-polarizing electrodes in contact with the earth. The grounding resistance is the DC resistance between the electrode dipoles, which reflects the conductivity of the shallow surface of the surveyed area and directly affects the quality of data acquisition.

[0003] In the magnetotelluric sounding work in desert areas, due to the fine sand with large porosity and large permeability coefficient around the electrode pits of the site, and due to the high proportion of gas phase volume in the soil and the inability to ensure that the soil around the electrodes maintains an appropriate water content, the grounding resistance is often too large and difficult to control. When collecting data for magnetotelluric sounding work in desert areas, construction workers often use the raw materials of the site to bury the electrodes and backfill the electrode pits, making it difficult for the measured grounding resistance data to meet the requirements of industry specifications. Only by continuously trying to bury the electrodes at different locations for experimental measurement can the positions with appropriate grounding resistance be found for data acquisition, or by using an excavator or a large number of workers to increase the volume of the electrode pits and transporting a large amount of cohesive soil to fill the electrodes for improvement, which not only greatly reduces the work efficiency but also greatly increases the construction cost. Summary of the Invention

[0004] The purpose of the present invention is to provide a device for improving the grounding resistance of magnetotelluric sounding in desert areas, so as to solve the problems existing in the above-mentioned prior art, obtain a stable grounding resistance in an electrode pit with a conventional volume, reduce the construction cost, and improve the work efficiency.

[0005] To achieve the above purpose, the present invention provides the following solution:

[0006] The present invention provides a device for improving the grounding resistance of magnetotelluric sounding in desert areas, including a water supply tank, a water supply ring cylinder, a ring cover and a sunshade. The water supply ring cylinder is used to be placed in the electrode pit. The water supply ring cylinder includes an inner cylinder and an outer cylinder sleeved outside the inner cylinder. An annular space is formed between the inner cylinder and the outer cylinder. The annular space is filled with anti-blocking material. The inner cylinder is filled with grounding filler, and electrodes are buried in the grounding filler. A plurality of water permeable holes are provided on the side wall of the inner cylinder. The ring cover covers the upper end port of the annular space, and the lower end of the annular space is closed. A water supply switch is provided at the bottom of the water supply tank, and the water supply switch is communicated with the annular space through a water pipe. The sunshade is used to cover above the water supply ring cylinder to shield the grounding filler.

[0007] Preferably, a plurality of grooves that are recessed inwardly and extend longitudinally are provided on the side wall of the inner cylinder, a plurality of the water permeable holes are provided at the bottom of each groove, and the anti-blocking material is filled in each groove.

[0008] Preferably, each of the grooves is uniformly distributed circumferentially on the side wall of the inner cylinder.

[0009] Preferably, the water supply tank is a plastic water tank, and the water supply ring cylinder is a reinforced plastic ring cylinder.

[0010] Preferably, a leak-proof gasket is provided at the top of the anti-blocking material.

[0011] Preferably, the anti-blocking material is filter cotton, and a geomembrane is wrapped outside the filter cotton.

[0012] Preferably, the water supply switch is a stepless variable flow switch.

[0013] The present invention has achieved the following technical effects compared with the prior art:

[0014] The present invention provides a device for improving the grounding resistance of magnetotelluric sounding in desert areas. Through the water supply tank, a stable water supply can be provided to the grounding filler in the inner cylinder. Through the sunshade, the grounding filler can be shielded to prevent the moisture in the grounding filler from evaporating too quickly due to solar heating, ensuring the wetness of the grounding filler. Thus, after the electrodes are buried in the grounding filler, a stable grounding resistance can be obtained. Compared with the traditional method of continuously trying to find suitable grounding resistance points, or using an excavator or a large number of workers to increase the volume of the electrode pit and transporting a large amount of viscous soil to fill the electrodes for improvement, by using this device, only the water supply ring cylinder needs to be placed in the electrode pit with a conventional volume at the measuring point, filling the anti-blocking material and the grounding filler, and ensuring the wetness of the grounding filler, which reduces the construction cost and improves the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only 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.

[0016] Figure 1 It is a schematic structural diagram of the device for improving the grounding resistance of magnetotelluric sounding in desert areas provided by the present invention;

[0017] Figure 2 It is a schematic structural diagram of the water supply ring cylinder and the ring cover in the present invention;

[0018] Figure 3 It is a schematic bottom view structural diagram of the water supply ring cylinder in the present invention;

[0019] In the figure: 1 - water supply tank, 2 - water supply ring cylinder, 21 - inner cylinder, 22 - outer cylinder, 23 - annular space, 3 - ring cover, 4 - sunshade, 5 - anti - blocking material, 6 - grounding filler, 7 - water - permeable holes, 8 - water supply switch, 9 - water pipe, 10 - groove. Specific embodiments

[0020] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. 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.

[0021] The purpose of the present invention is to provide a device for improving the grounding resistance in magnetotelluric sounding in desert areas, so as to solve the problems existing in the prior art, obtain a stable grounding resistance in an electrode pit with a conventional volume, reduce the construction cost, and improve the work efficiency.

[0022] In order to make the above - mentioned objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] As Figures 1 - 3 shown, this embodiment provides a device for improving the grounding resistance in magnetotelluric sounding in desert areas, including a water supply tank 1, a water supply ring cylinder 2, a ring cover 3 and a sunshade 4. The water supply ring cylinder 2 is used to be placed in an electrode pit. The water supply ring cylinder 2 includes an inner cylinder 21 and an outer cylinder 22 sleeved outside the inner cylinder 21. An annular space 23 is formed between the inner cylinder 21 and the outer cylinder 22. An anti - blocking material 5 is filled in the annular space 23. A grounding filler 6 is filled in the inner cylinder 21. Electrodes are buried in the grounding filler 6. A plurality of water - permeable holes 7 are provided on the side wall of the inner cylinder 21. The ring cover 3 covers the upper end port of the annular space 23. The lower end of the annular space 23 is closed. A water supply switch 8 is provided at the bottom of the water supply tank 1. The water supply switch 8 is communicated with the annular space 23 through a water pipe 9. The sunshade 4 is used to cover above the water supply ring cylinder 2 to shield the grounding filler 6.

[0024] Before use, pre-fill the water supply tank 1 with water, correctly fill the anti-blocking material 5 into the water supply ring cylinder 2, and cover the ring cover 3; after arriving at the measuring point, first level the site and dig an electrode pit, connect the water supply tank 1 and the water supply ring cylinder 2 through the water pipe 9. The water supply tank 1 should be placed at a high place for convenient water supply, and then the water supply ring cylinder 2 is lowered into the electrode pit; fill the grounding filler 6 into the interior of the water supply ring cylinder 2, and at the same time bury the electrodes according to the requirements of magnetotelluric sounding work, so that the grounding filler 6 fully contacts the sandy soil at the bottom of the pit and completely buries the electrodes; backfill the electrode pit, lay the sunscreen cover 4 flat on it, and evenly press it with the on-site stones or sandy soil; after measuring that the grounding resistance is appropriate, the magnetotelluric sounding data acquisition can be carried out. Through the water supply tank 1, this device can provide a stable water supply to the grounding filler 6 in the inner cylinder 21. Through the sunscreen cover 4, the grounding filler 6 can be shielded to prevent the moisture in the grounding filler 6 from evaporating too quickly due to the rising temperature of sunlight, so as to ensure the moisture of the grounding filler 6. Thus, after burying the electrodes in the grounding filler 6, a stable grounding resistance can be obtained. Compared with the traditional method of continuously trying to find a suitable grounding resistance point, or using an excavator or a large number of workers to increase the volume of the electrode pit and transporting a large amount of viscous soil to fill and improve the electrodes, using this device only requires placing the water supply ring cylinder 2 in an electrode pit with a conventional volume at the measuring point, filling the anti-blocking material 5 and the grounding filler 6, and ensuring the moisture of the grounding filler 6, which reduces the construction cost and improves the work efficiency.

[0025] In this embodiment, a plurality of grooves 10 that are recessed inward and extend longitudinally are provided on the side wall of the inner cylinder 21. A plurality of water permeable holes 7 are provided at the bottom of each groove 10, and the anti-blocking material 5 is filled in each groove 10. Through the setting of the anti-blocking material 5, the sandy soil is prevented from blocking the water permeable holes 7, so as to supply water to the inner cylinder 21 through the water permeable holes 7 to ensure the moisture of the grounding filler 6.

[0026] In this embodiment, the grooves 10 are evenly distributed along the circumferential direction on the side wall of the inner cylinder 21, and can evenly supply moisture to the grounding filler 6.

[0027] In this embodiment, the water supply tank 1 is a plastic water tank, and the water supply ring cylinder 2 is a reinforced plastic annular cylinder. The volume of the water supply tank 1 is 200L, and the water pipe 9 is a 1-inch water pipe.

[0028] In this embodiment, an anti-leakage gasket is provided on the top of the anti-blocking material 5.

[0029] In this embodiment, the anti-blocking material 5 is filter cotton, and the filter cotton is wrapped with a geomembrane.

[0030] In this embodiment, the water supply switch 8 is a stepless variable flow switch, such as a tap water faucet, which is convenient for adjusting the water supply volume.

[0031] In the present invention, specific examples are used to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A device for improving the grounding resistance in magnetotelluric sounding in desert areas, characterized in that: It includes a water supply tank, a water supply ring cylinder, a ring cover and a sunshade. The water supply ring cylinder is used to be placed in the electrode pit. The water supply ring cylinder includes an inner cylinder and an outer cylinder sleeved outside the inner cylinder. An annular space is formed between the inner cylinder and the outer cylinder. The annular space is filled with anti-blocking material. The inner cylinder is filled with grounding filler, and electrodes are buried in the grounding filler. A plurality of water permeable holes are provided on the side wall of the inner cylinder. The ring cover covers the upper end port of the annular space, and the lower end of the annular space is closed. A water supply switch is provided at the bottom of the water supply tank. The water supply switch is communicated with the annular space through a water pipe. The sunshade is used to cover above the water supply ring cylinder to shield the grounding filler; A plurality of grooves which are recessed inward and extend longitudinally are provided on the side wall of the inner cylinder. A plurality of the water permeable holes are provided at the bottom of each groove, and the anti-blocking material is filled in each groove; The anti-blocking material is filter cotton, and the filter cotton is wrapped with geomembrane.

2. The device for improving the grounding resistance in magnetotelluric sounding in desert areas according to claim 1, characterized in that: Each of the grooves is uniformly distributed on the side wall of the inner cylinder in the circumferential direction.

3. The device for improving the grounding resistance in magnetotelluric sounding in desert areas according to claim 1, wherein: The water supply tank is a plastic water tank, and the water supply ring cylinder is a reinforced plastic annular cylinder.

4. The device for improving the grounding resistance in magnetotelluric sounding in desert areas according to claim 1, wherein: An anti-leakage gasket is provided at the top of the anti-blocking material.

5. The device for improving the grounding resistance in magnetotelluric sounding in desert areas according to claim 1, wherein: The water supply switch is a stepless variable current switch.

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