A method for detecting and treating karst caves during vertical shaft pilot hole drilling

Abstract

The present invention relates to the technical field of karst cave disposal, specifically to a karst cave detection and disposal method used in the process of drilling a pilot hole of a vertical shaft, comprising the following steps: connecting and installing equipment; turning on the control system, and starting to lower a video probe into the pilot hole of the vertical shaft through a line surveying winch; real-time surveying the internal conditions of the pilot hole of the vertical shaft, and displaying the shape, size, and specific depth of the karst cave; filling the karst cave with cement slurry; after the cement slurry solidifies, using a drilling rig to continue drilling the pilot hole of the vertical shaft, and after drilling through the karst cave section, using a video probe to inspect the filled karst cave. The present invention can accurately detect the shape, size, and specific depth of the karst cave through the coordinated use of a control system, a line surveying winch, a meter, and a video probe, so that subsequent workers can more accurately inject an appropriate amount of cement slurry, which not only reduces the waste of cement slurry, but also reduces the number of repeated fillings, and speeds up the construction process.

Description

Technical Field

[0001] The invention relates to the technical field of karst cave treatment, and in particular to a karst cave detection and treatment method used in the process of vertical shaft pilot hole drilling. Background Art

[0002] During the drilling process of the pilot hole of the vertical shaft, the development of karst caves often causes the drill pipe to leak and fail to return slag. In serious cases, drill jams and drill burial accidents may occur. This will seriously affect the construction period and increase construction costs. Therefore, during the drilling process of the pilot hole of the vertical shaft in the karst area, how to accurately detect the karst caves and effectively deal with them is a key issue.

[0003] At present, for the detection of karst caves in the pilot hole of a vertical shaft, a microprobe is often placed into the pilot hole using a thin rope, and the development of the karst caves in the pilot hole is observed by recording with the microprobe. Although the method of using a microprobe to observe the karst caves in the pilot hole is convenient to operate, it cannot accurately detect the development position of the pilot hole, and it cannot transmit the detection results to the ground in real time. At the same time, the microprobe is also prone to fall into the hole. Based on this, a karst cave detection and disposal method for the process of drilling a pilot hole in a vertical shaft is proposed. Summary of the invention

[0004] In order to address the deficiencies in the prior art, the present invention provides a method for detecting and handling caves encountered during the drilling of a pilot hole in a vertical shaft. Through the coordinated use of a control system, a line measuring winch, a meter and a video probe, subsequent staff can more accurately inject an appropriate amount of cement slurry, thereby accelerating the construction process.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for detecting and treating karst caves during the drilling of a pilot hole in a vertical shaft, comprising the following steps:

[0006] (1) Equipment connection: connect the control system, line measuring winch, meter and video probe in sequence;

[0007] (2) Detection preparation: Turn on the control system, reset the meter data to zero, and then use the survey line winch to lower the video probe into the pilot hole of the shaft. The video probe has a built-in LED light and is waterproof.

[0008] (3) Cave exploration: During the lowering process, the video probe will survey the internal conditions of the pilot hole of the shaft in real time. The exploration results will be transmitted to the control system in real time, and the shape, size and specific depth of the cave will be displayed on the display of the control system.

[0009] (4) Cave filling: Fill the cave with cement slurry, and stop filling when the liquid level of the cement slurry is above the cave;

[0010] (5) Result inspection: After the cement slurry solidifies, continue drilling the pilot hole of the vertical shaft using a drilling rig. After drilling through the cave section, use a video probe to inspect the filled cave. Based on the inspection results, choose to continue drilling or continue filling with cement slurry.

[0011] Preferably, in step (1), the control system and the line measuring winch are connected via a connecting line; the cable in the line measuring winch is installed on a meter, and the end of the cable facing away from the line measuring winch passes through the meter and is installed with the video probe.

[0012] Preferably, in step (2), the video probe includes two groups of cameras arranged along the well depth direction and the horizontal direction, and the displays of the two groups of cameras can be switched by the control system.

[0013] Preferably, in step (3), in sections without cave development, a camera in the well depth direction is used for survey; in sections with cave development, a camera in the horizontal direction is used for survey; and the survey results are transmitted to the control system in real time via cables and connecting lines.

[0014] Preferably, in step (4), the liquid level of the cement slurry is 3-8 m higher than the cave.

[0015] Preferably, in step (5), when it is detected that the cave treatment effect is good, it is selected to continue drilling; when it is detected that the cave treatment effect is not good, it is selected to continue filling with cement slurry.

[0016] The present invention provides a method for detecting and treating karst caves during the drilling of a pilot hole in a vertical shaft, which has the following beneficial effects compared with the prior art:

[0017] 1. Through the coordinated use of the control system, line winch, meter and video probe, the shape, size and specific depth of the cave can be accurately detected and displayed in real time, so that subsequent staff can more accurately inject the right amount of cement slurry, which not only reduces the waste of cement slurry, but also reduces the number of repeated fillings and speeds up the construction process.

[0018] 2. Since cement undergoes hydration reaction during solidification, its volume usually shrinks to a certain extent. The liquid level of the cement slurry filled in the pilot hole of the vertical shaft in the present invention is higher than that of the cave. Reserving part of the cement slurry in the pilot hole can avoid the formation of gaps in the cave due to volume shrinkage of the cement slurry, thereby ensuring the filling effect of the cave. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0020] Figure 1 This is a schematic diagram of the video probe of the present invention surveying a karst cave;

[0021] Figure 2 This is a schematic diagram of the present invention after the cement slurry is filled into the cave. DETAILED DESCRIPTION

[0022] The following examples are used to explain the implementation methods of the present application in detail, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0023] Example 1

[0024] A method for detecting and treating karst caves during the drilling of a pilot hole in a vertical shaft comprises the following steps:

[0025] (1) Equipment connection: The control system, line measuring winch, meter counter and video probe are connected in sequence; the control system and line measuring winch are connected via a connecting wire; the cable in the line measuring winch is installed on the meter counter, and the end of the cable away from the line measuring winch passes through the meter counter and is installed on the video probe.

[0026] (2) Detection preparation: Turn on the control system, reset the meter data to zero, and then use the survey line winch to lower the video probe into the pilot hole of the vertical shaft; the video probe includes two sets of cameras set along the depth direction and horizontal direction of the well. The display of the two sets of cameras can be switched through the control system.

[0027] (3) Cave exploration: During the lowering process, the video probe will conduct real-time exploration of the internal conditions of the pilot hole of the vertical shaft. That is, in the section without cave development, the camera in the well depth direction will be used for exploration; in the section with cave development, the camera in the horizontal direction will be used for exploration; the exploration results will be transmitted to the control system in real time through cables and connecting lines, and the shape, size and specific depth of the cave will be displayed on the display of the control system.

[0028] (4) Cave filling: Use cement slurry to fill the cave. Stop filling when the liquid level of the cement slurry (the liquid level of the cement slurry in the pilot hole of the vertical shaft) is 5m above the cave.

[0029] (5) Result inspection: After the cement slurry solidifies, continue drilling the pilot hole of the vertical shaft using a drilling rig. After drilling through the cave section, use a video probe to inspect the filled cave. If the cave treatment effect is good, continue drilling.

[0030] Example 2

[0031] The same as steps (1) to (3) in Example 1, except for the following:

[0032] (4) Cave filling: Use cement slurry to fill the cave. Stop filling when the liquid level of the cement slurry (the liquid level of the cement slurry in the pilot hole of the vertical shaft) is 3m above the cave.

[0033] (5) Result inspection: After the cement slurry solidifies, continue drilling the pilot hole of the vertical shaft using a drilling rig. After drilling through the cave section, use a video probe to inspect the filled cave. If the cave treatment effect is good, continue drilling.

[0034] Example 3

[0035] The same as steps (1) to (3) in Example 1, except for the following:

[0036] (4) Cave filling: Use cement slurry to fill the cave. Stop filling when the liquid level of the cement slurry (the liquid level of the cement slurry in the pilot hole of the vertical shaft) is 8m above the cave.

[0037] (5) Result inspection: After the cement slurry solidifies, continue drilling the pilot hole of the vertical shaft using a drilling rig. After drilling through the cave section, use a video probe to inspect the filled cave. If the cave treatment effect is good, continue drilling.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for detecting and treating karst caves during the drilling of a pilot hole in a vertical shaft, characterized in that: The following steps are included: (1) Equipment connection: connect the control system, line measuring winch, meter and video probe in sequence; (2) Detection preparation: Turn on the control system, reset the meter data to zero, and then start lowering the video probe into the pilot hole of the shaft using the survey line winch; (3) Cave exploration: During the lowering process, the video probe will survey the internal conditions of the pilot hole of the shaft in real time. The exploration results will be transmitted to the control system in real time, and the shape, size and specific depth of the cave will be displayed on the display of the control system. (4) Cave filling: Fill the cave with cement slurry, and stop filling when the liquid level of the cement slurry is above the cave; (5) Result inspection: After the cement slurry solidifies, continue drilling the pilot hole of the vertical shaft using a drilling rig. After drilling through the cave section, use a video probe to inspect the filled cave. Based on the inspection results, choose to continue drilling or continue filling with cement slurry.

2. The method for cave detection and treatment in the process of vertical shaft pilot hole drilling according to claim 1 is characterized in that: In step (1), the control system and the line measuring winch are connected via a connecting line; the cable in the line measuring winch is installed on a meter, and the end of the cable away from the line measuring winch passes through the meter and is installed with the video probe.

3. The method for treating a karst cave in a vertical shaft pilot hole according to claim 2, characterized in that: In step (2), the video probe includes two groups of cameras arranged along the well depth direction and the horizontal direction, and the displays of the two groups of cameras can be switched through the control system.

4. The method for cave detection and treatment in the process of vertical shaft pilot hole drilling according to claim 3 is characterized in that: In step (3), in the section without cave development, a camera in the well depth direction is used for survey; in the section with cave development, a camera in the horizontal direction is used for survey; the survey results are transmitted to the control system in real time through cables and connecting lines.

5. The method for cave detection and treatment in the process of vertical shaft pilot hole drilling according to claim 1 is characterized in that: In step (4), the liquid level of the cement slurry is 3-8 m higher than the cave.

6. The method for cave detection and treatment in the process of vertical shaft pilot hole drilling according to claim 1, characterized in that: In step (5), when it is found that the cave treatment effect is good, it is selected to continue drilling; when it is found that the cave treatment effect is not good, it is selected to continue filling with cement slurry.

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