CN212391422U - Openable and closable in-hole resistivity testing device - Google Patents

Abstract

The utility model discloses an downthehole resistivity testing arrangement that can open and shut, including urceolus and the inner tube of setting in the urceolus, seted up a set of work hole according to certain interval on the lateral wall of urceolus, fixed mounting has a set of spring leaf that corresponds with the work hole on the outer wall of inner tube, is fixed with the electrode on every spring leaf, and the diameter of work hole is greater than the diameter of electrode, is provided with the cable conductor in the urceolus, the electrode pass through the cable conductor and be connected with outside resistivity tester. The utility model discloses it has the working hole to open on the urceolus, when rotating the inner tube through rotating the hand dish, fixes the electrode on the spring leaf then can slide along the arc guide way, stretches out from the working hole until the electrode, and testing arrangement gets into operating condition this moment, and the soil body contact in electrode and the drilling realizes laminating drilling and carries out the electrical test, lets the test data result more accurate reliable.

Description

Openable and closable in-hole resistivity testing device

Technical Field

The utility model relates to an downthehole resistivity testing arrangement that can open and shut belongs to solution cavity detection technical field.

Background

In the new century, with the improvement of building level and the increasing shortage of land resources, people need to turn the attention of building land to karst areas which are not beneficial to building, overcome the defects brought by the karst areas and build safe buildings suitable for people to live, move and work. Therefore, the handling of the cavern becomes a critical issue, and the most important step is the detection of the cavern. In the current common karst cave detection method, the electrodes are generally only arranged on the ground surface, and a plurality of electrodes (generally not less than 60 electrodes) are arranged on the ground surface at the same time to measure the resistivity distribution of the underground two-dimensional ground electrical section so as to form an underground resistivity profile. However, the existing earth surface resistivity testing device is simple and crude, the detection process is easily interfered by external factors, the electrode running mode is complicated, when the section to be detected is large, a large number of electrodes are often arranged, the electrodes are translated point by point, the device cannot be well suitable for some complex terrains to detect, and a wide field is needed to detect the complete section. In addition, the current earth surface test has shallow detection depth which cannot go deep into the stratum, only electrodes are arranged at the earth surface, a deeper karst cave cannot be detected sometimes, the detection depth range is insufficient, and accurate geoelectrical information and data are difficult to obtain.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a resistivity testing arrangement in hole that can open and shut with low costs, easy operation, convenient and practical, the device can let the electrode can stretch into in the drilling, realizes laminating drilling and carries out the earth electricity test, lets the test data result more accurate reliable.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a device for testing resistivity in a hole capable of being opened and closed comprises an outer barrel and an inner barrel arranged in the outer barrel, wherein a group of working holes are formed in the side wall of the outer barrel at certain intervals, a group of spring pieces corresponding to the working holes are fixedly installed on the outer wall of the inner barrel, an electrode is fixed on each spring piece, the diameter of each working hole is larger than that of each electrode, a cable is arranged in the inner barrel, and the electrodes are connected with an external resistivity tester through the cables.

Further, an arc-shaped guide groove extending to the working hole is formed in the inner wall of the outer barrel, and the depth of the arc-shaped guide groove is gradually deepened towards the working hole.

Furthermore, the upper port part of the outer cylinder is provided with a marking line, and the position of the marking line and the center of the working hole are on the same vertical plane.

Further, two fixing rings are symmetrically fixed at the upper end of the outer cylinder.

Further, the upper end and the lower end of the outer barrel are both provided with female screw joints.

Furthermore, the upper end of the inner cylinder is connected with a prefabricated connecting pipe through an external thread connector in a threaded manner, and the upper end of the prefabricated connecting pipe is connected with a rotating hand disc in a threaded manner.

Further, the spring piece is fixed on the outer wall of the inner barrel through a screw.

Since the technical scheme is used, the utility model discloses an advantage has below: the utility model discloses it has the working hole to open on the urceolus, when rotating the inner tube through rotating the hand dish, fixes the electrode on the spring leaf then can slide along the arc guide way, stretches out from the working hole until the electrode, and testing arrangement gets into operating condition this moment, and the soil body contact in electrode and the drilling realizes laminating drilling and carries out the electrical test, lets the test data result more accurate reliable. Therefore, the utility model discloses break away from the limitation of earth's surface exploration resistivity, can stretch into in the drilling to the device can receive and close and disassemble, has the characteristics of assembled, and transportation storage and reuse nature are strong, use in the various places of convenient practical application.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a partial cross-sectional view of the outer barrel;

FIG. 3 is a schematic view of the connection structure of the inner cylinder.

Fig. 4 is a schematic diagram of soil layer conditions in the embodiment of the present invention.

Description of reference numerals: 1-outer cylinder, 2-inner cylinder, 3-spring piece, 4-electrode, 5-cable, 6-fixing ring, 7-working hole, 8-arc guide groove, 9-marking line, 10-internal thread joint, 11-external thread joint, 12-rotating hand disc, 13-prefabricated adapter and 14-screw.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The embodiment of the utility model provides a: referring to fig. 1 to 3, a retractable in-hole resistivity testing device includes an outer cylinder 1 and an inner cylinder 2 disposed in the outer cylinder 1, a set of working holes 7 are disposed on a side wall of the outer cylinder 1 at an interval of 0.5m, a set of spring strips 3 corresponding to the working holes 7 are fixedly mounted on an outer wall of the inner cylinder 2, an electrode 4 is fixed on each spring strip 3, a diameter of the working hole 7 is larger than that of the electrode 4, a cable 5 is disposed in the inner cylinder 2, and the electrode 4 is connected with an external resistivity tester through the cable 5. An arc-shaped guide groove 8 extending to the working hole 7 is formed in the inner wall of the outer barrel 1, and the depth of the arc-shaped guide groove 8 is gradually deepened towards the working hole 7. The upper port part of the outer cylinder 1 is provided with a marking line 9, and the position of the marking line 9 and the center of the working hole 7 are on the same vertical plane, so that the position of the working hole 7 can be determined through the marking line 9, and the operation is convenient. Two fixing rings 6 are symmetrically fixed at the upper end of the outer cylinder 1 and are fixed with soil at the mouth of a drill hole through the fixing rings 6. The upper end and the lower end of the outer barrel 1 are provided with female screw joints 10, and the outer barrels 1 can be connected through the female screw joints 10 and used for detecting drill holes in different depths. The upper end of the inner cylinder 2 is in threaded connection with a prefabricated connecting pipe 13 through an external thread connector 11, and the upper end of the prefabricated connecting pipe 13 is in threaded connection with a rotary hand disc 12. The spring plate 3 is fixed on the outer wall of the inner barrel 2 through a screw 14.

The utility model discloses a theory of operation: the utility model discloses it has work hole 7 to open on urceolus 1, when slowly rotating inner tube 2 through rotating hand dish 12, fixes electrode 4 on spring leaf 3 then can slide along arc guide way 8, stretches out from work hole 7 until electrode 4, and testing arrangement gets into operating condition this moment, and electrode 4 and the soil body contact in the drilling realize laminating drilling and carry out the earth electricity test, and it is more accurate reliable to let the test data result. Therefore, the utility model discloses break away from the limitation of earth's surface exploration resistivity, can stretch into in the drilling to the device can receive and close and disassemble, has the characteristics of assembled, and transportation storage and reuse nature are strong, use in the various places of convenient practical application.

The embodiment of the utility model provides a: referring to fig. 4, for a project being drilled in a karst area of Guangdong province, the following soil layer conditions are obtained by analyzing the soil sample results of the soil cores of the drill holes in the area to be detected, which are sequentially from top to bottom: A. filling soil with impurities, wherein the average layer thickness is 1.5 m; B. mucky soil with an average layer thickness of 2.1 m; C. fine sand with an average layer thickness of 3.25 m; D. coarse sand, the average layer thickness is 3.5 m; E. powdery clay with an average layer thickness of 2.38 m; F. strongly weathered, moderately weathered, and weakly weathered limestone; one of the drill hole soil samples has a hollow at the underground depth of 18 m. In the area, a karst cave may exist underground, the soil layer needs to be further detected, the resistivity of the drilled hole with the soil core is detected, and a resistivity tester is placed on one side of the drilled hole.

The utility model discloses a concrete application step:

splicing the outer cylinder 1 to the depth (18m) of a predicted cavity through the internal thread joint 10 section by section, and temporarily fixing the outer cylinder 1 to the ground through the fixing ring 6 at the upper end of the outer cylinder;

step two, screwing the inner barrel 2 with the electrode 4 and the prefabricated adapter 13 through the external thread joint 11, enabling the inner barrel 2 to reach the depth to be detected, enabling one side of the inner barrel 2 with the electrode 4 to be arranged near one side of the outer barrel 1 with the working hole 7, enabling the position of the electrode 4 to be located in the arc-shaped guide groove 8 on the inner side of the outer barrel, and then connecting the electrode 4 with an external resistivity tester through a cable 5;

step three, after the outer cylinder 1, the inner cylinder 2 and the prefabricated connecting pipe 13 are fixed, the rotating hand disc 12 is installed at the top of the prefabricated connecting pipe 13;

step four, rotating the rotating hand disc 12 at the top to enable the electrode 4 to slide along the arc-shaped guide groove 8 until the electrode is ejected out of the working hole 7;

and step five, the testing device enters a working state at the moment, the electrode 4 is in contact with the soil body in the drilled hole, the ground electricity test of the attached drilled hole is realized, and the test data result is more accurate and reliable.

Claims (7)

1. The utility model provides an downthehole resistivity testing arrangement that can open and shut, includes urceolus (1) and sets up inner tube (2) in urceolus (1), its characterized in that: a set of working holes (7) are formed in the side wall of the outer barrel (1) at a certain interval, a set of spring pieces (3) corresponding to the working holes (7) are fixedly mounted on the outer wall of the inner barrel (2), an electrode (4) is fixed on each spring piece (3), the diameter of each working hole (7) is larger than that of each electrode (4), a cable (5) is arranged in the inner barrel (2), and the electrodes (4) are connected with an external resistivity tester through the cable (5).

2. The openable and closable in-hole resistivity test apparatus according to claim 1, wherein: an arc-shaped guide groove (8) extending to the working hole (7) is formed in the inner wall of the outer barrel (1), and the depth of the arc-shaped guide groove (8) is gradually deepened towards the working hole (7).

3. The openable and closable in-hole resistivity test apparatus according to claim 1, wherein: the outer barrel is characterized in that a marking line (9) is arranged at the upper end opening of the outer barrel (1), and the position of the marking line (9) and the center of the working hole (7) are on the same vertical plane.

4. The openable and closable in-hole resistivity test apparatus according to claim 1, wherein: two fixing rings (6) are symmetrically fixed at the upper end of the outer cylinder (1).

5. The openable and closable in-hole resistivity test apparatus according to claim 1, wherein: the upper end and the lower end of the outer barrel (1) are provided with female screw joints (10).

6. The openable and closable in-hole resistivity test apparatus according to claim 1, wherein: the upper end of the inner barrel (2) is connected with a prefabricated connecting pipe (13) through an external thread connector (11), and the upper end of the prefabricated connecting pipe (13) is connected with a rotating hand disc (12) through a thread.

7. The openable and closable in-hole resistivity test apparatus according to claim 1, wherein: the spring piece (3) is fixed on the outer wall of the inner cylinder (2) through a screw (14).

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