A long-term hole wall maintaining system for easily caving boreholes

Abstract

The present invention discloses a long-term hole wall maintenance system for easily caving boreholes, which includes a transparent cylinder body, a support frame and a cleaning device. A transparent filling layer is arranged between the outer part of the transparent cylinder body and the inner wall of the borehole; an anti-reflection coating is arranged on the inner wall of the transparent cylinder body; the cleaning device is movably arranged inside the transparent cylinder body. Advantages: It overcomes the problem of difficult imaging caused by cave-ins of the borehole wall due to soft and broken rock masses, and can achieve long-term maintenance of the borehole and multi-frequency and long-period acquisition of hole wall images; it can ensure the visualization of the hole wall on the basis of maintaining the integrity of the borehole wall; through the cleaning device, the transparent cylinder body can be cleaned efficiently, quickly and safely, removing dust, mud stains, water stains and water mist inside the transparent cylinder body, ensuring the visualization effect of the downhole TV in the borehole, and providing observation conditions and data for quantifying the evolution process of joint fissures inside the rock mass under the action of factors such as mining disturbance.

Description

Technical Field:

[0001] The present invention relates to the technical field of observation methods for internal joint fissures in rock masses during mine exploitation, and specifically to a long-term hole wall retention system for easily caving boreholes. Background Art:

[0002] Stress disturbances during the development of mineral resources can affect the rock mass structure and mechanical properties. The typical phenomenon is the formation and expansion of internal fracture surfaces in the rock mass and the reduction of the rock mass strength. Therefore, the observation and analysis of internal joint fissures in the rock mass are the basis for accurately evaluating the physical and mechanical parameters and stability of the rock mass.

[0003] Since the self-stabilizing ability of relatively fractured or soft rock masses is poor, boreholes formed in such rock masses will experience phenomena such as hole wall collapse and borehole blockage within a certain period of time, resulting in the inability of downhole television and other instrument equipment to be normally lowered into the borehole to re-observe the formation structure of the hole wall and the development of structural planes.

[0004] Traditional large-diameter borehole maintenance methods include: steel sheet pile support, row pile support, soil nail support, diaphragm wall support, deep mixing support, anchor pile construction, and soil nail support, etc. For geological boreholes, their maintenance costs are too high, and there are few maintenance methods for small-diameter boreholes. Therefore, it is very necessary to develop a long-term hole wall retention method for small-diameter easily caving boreholes for long-term retention of the borehole wall and multi-frequency and long-cycle borehole wall imaging, and it has good application prospects. Summary of the Invention:

[0005] The purpose of the present invention is to provide a long-term hole wall retention system for easily caving boreholes, which can ensure hole wall visualization on the basis of maintaining the integrity of the borehole wall.

[0006] The present invention is implemented by the following technical solution: A long-term hole wall retention system for easily caving boreholes, which includes a transparent cylinder, a support frame, and a cleaning device. The transparent cylinder is arranged inside the borehole through the support frame, and a plurality of the support frames are arranged on the outer wall of the transparent cylinder; a transparent filling layer is arranged between the outer part of the transparent cylinder and the inner wall of the borehole; an anti-reflection coating is arranged on the inner wall of the transparent cylinder; the cleaning device is movably arranged inside the transparent cylinder.

[0007] Further, the support frame includes a fixed shaft, a fixed rod, and a pulley. The fixed shaft is arranged horizontally, and both ends of the fixed shaft are fixedly connected to the outer wall of the transparent cylinder through the fixed rod, and the pulley is rotatably arranged outside the fixed shaft.

[0008] Furthermore, the fixed rod is a telescopic fixed rod, and both ends of the fixed shaft are respectively fixed to the outer wall of the transparent cylinder through the two fixed rods; a spring is arranged between the fixed shaft and the transparent cylinder.

[0009] Furthermore, a guide rod is fixed to the outer wall of the transparent round tube between the two fixed rods. One end of the spring is sleeved outside the guide rod, and the other end of the spring is connected to the fixed shaft.

[0010] Furthermore, the cleaning device includes a water supply pump, a water suction pump, an air pump, a water outlet nozzle, an air outlet nozzle and a water suction head. The outlet of the water pump is connected to the water outlet nozzle through a water outlet pipe. The inlet of the water suction pump is communicated with the water suction head through a water suction pipe. The outlet of the air pump is communicated with the air outlet nozzle through a high-pressure air pipe; the water outlet nozzle, the air outlet nozzle and the water suction head are movably arranged inside the transparent cylinder.

[0011] Furthermore, the water outlet pipe, the water suction pipe and the high-pressure air pipe are arranged inside a cleaning pipe.

[0012] Furthermore, it further includes a cleaning head. An annular water pipe is arranged on the upper part of the cleaning head main body. A plurality of obliquely arranged water outlet nozzles are communicated with the outer wall of the annular water pipe. The outlet of the water outlet pipe is communicated with the annular water pipe; an annular air pipe is arranged on the lower side wall of the cleaning head. A plurality of air outlet nozzles are communicated with the outer wall of the annular air pipe. The outlet of the high-pressure air pipe is communicated with the annular air pipe; the water suction head is arranged at the bottom of the cleaning head. The inlet of the water suction pipe is communicated with the inlet of the water suction head.

[0013] Furthermore, two blocking fans with opposite blade directions are rotatably arranged on the outer wall of the cleaning head between the annular water pipe and the annular air pipe.

[0014] Furthermore, the transparent cylinder includes a lower cylinder with a closed bottom end and an upper cylinder. The bottom end of the upper cylinder is connected to the top end of the lower cylinder through a connecting section.

[0015] Furthermore, the connecting section includes a flexible pipe and a plurality of rigid sleeves fixed outside the flexible pipe; connecting pipes are respectively fixed at both ends of the flexible pipe. The connecting pipes are connected to the bottom end of the corresponding upper cylinder or the top end of the lower cylinder through clamps.

[0016] Advantages of the present invention: It overcomes the problem of difficult imaging caused by the collapse of the borehole wall due to soft and broken rock mass, and can achieve long-term maintenance of the borehole and multi-frequency and long-term acquisition of borehole wall images; it can ensure borehole wall visualization while maintaining the integrity of the borehole wall; through the cleaning device, the transparent cylinder can be efficiently, quickly and safely cleaned, removing dust, mud stains, water stains and water mist inside the transparent cylinder, ensuring the visualization effect of the downhole TV in the borehole, and providing observation conditions and data for quantifying the evolution process of internal joints and fractures in the rock mass under the action of factors such as mining disturbance. BRIEF DESCRIPTION OF THE DRAWINGS:

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the connection section structure.

[0019] Figure 3 It is a schematic diagram of the structure of the support frame.

[0020] Figure 4 It is a schematic diagram of the cleaning pipe structure.

[0021] Figure 5 It is a schematic diagram of the cleaning head structure.

[0022] Figure 6 It is a schematic diagram of the air blocking fan structure.

[0023] MARKING NAMES

[0024] 1 - transparent cylinder, 11 - lower section cylinder, 12 - upper section cylinder, 13 - connection section, 14 - flexible pipe, 15 - rigid casing, 16 - connecting pipe, 17 - clamp, 2 - support frame, 21 - fixed shaft, 22 - fixed rod, 23 - pulley, 24 - spring, 25 - guide rod, 3 - cleaning device, 31 - water pump, 32 - water suction pump, 33 - air pump, 34 - water outlet nozzle, 35 - air outlet nozzle, 36 - water suction head, 37 - water outlet pipe, 38 - water suction pipe, 39 - high-pressure air pipe, 310 - cleaning pipe, 311 - cleaning head, 312 - annular water pipe, 313 - annular air pipe, 314 - air blocking fan, 5 - transparent filling layer, 6 - anti-reflection coating. DETAILED DESCRIPTION OF THE INVENTION:

[0025] In the description of the present invention, it should be noted that when terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. This 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 therefore should not be construed as a limitation to the present invention. In addition, when terms such as "first", "second", "third" appear, they are only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] As Figures 1 to 6 shown, a long-term hole wall maintaining system for easily collapsible drill holes includes a transparent cylinder 1, a support frame 2, and a cleaning device 3. The transparent cylinder 1 is arranged inside the drill hole 4 through the support frame 2. The transparent cylinder 1 is made of acrylic material. The transparent cylinder 1 includes a lower cylinder section 11 with a closed bottom end and an upper cylinder section 12. The bottom end of the upper cylinder section 12 is connected to the top end of the lower cylinder section 11 through a connecting section 13. The connecting section 13 includes a flexible tube 14 and a number of rigid sleeves 15 fixed on the outside of the flexible tube 14. Both ends of the flexible tube 14 are respectively fixed with connecting pipes 16, and the connecting pipes 16 are connected to the bottom end of the corresponding upper cylinder section 12 or the top end of the lower cylinder section 11 through clamps 17. The rigid sleeves are pasted on the outside of the flexible tube 14 in a segmented manner, each section being 1 - 3 cm long and spaced 2 - 3 mm apart, so that the connecting section 13 can swing within a small range, ensuring that the transparent cylinder 1 can be smoothly inserted into the drill hole when the drill hole deflects.

[0027] A number of support frames 2 are arranged on the outer wall of the transparent cylinder 1. Four support frames in the same group are distributed in a cross shape on the outer wall of the transparent cylinder 1, facilitating the positioning of the transparent cylinder 1 at the center position of the drill hole. The support frame 2 includes a fixed shaft 21, a fixed rod 22, and a pulley 23. The fixed shaft 21 is arranged horizontally, and both ends of the fixed shaft 21 are respectively fixedly connected to the outer wall of the transparent cylinder 1 through the fixed rod 22. A pulley 23 is rotatably arranged outside the fixed shaft 21. During the process of lowering the transparent cylinder 1, the pulley 23 rolls along the inner wall of the drill hole, facilitating the smooth insertion of the transparent cylinder 1 into the drill hole.

[0028] The fixed rod 22 is a telescopic fixed rod 22. Both ends of the fixed shaft 21 are respectively fixedly connected to the outer wall of the transparent cylinder 1 through two fixed rods 22. A spring 24 is arranged between the fixed shaft 21 and the transparent cylinder 1. A guide rod 25 is fixed on the outer wall of the transparent cylinder between the two fixed rods 22. One end of the spring 24 is sleeved outside the guide rod 25, and the other end of the spring 24 is connected to the fixed shaft 21. Through the cooperation of the spring 24 and the telescopic fixed rod 22, the transparent cylinder 1 can be supported in drill holes with different diameters, improving the applicability.

[0029] A transparent filling layer 5 is provided between the outside of the transparent cylinder 1 and the inner wall of the borehole. After the transparent cylinder 1 and the support frame 2 are integrally placed inside the borehole, transparent liquid resin is injected between the transparent cylinder 1 and the inner wall of the borehole. After it cools, the transparent filling layer 5 is formed. Using the transparent filling layer 5 to fill the space between the transparent cylinder 1 and the borehole can prevent the outer wall of the transparent cylinder 1 from being contaminated and affecting the observation effect. An anti-reflection coating 6 is provided on the inner wall of the transparent cylinder 1 to reduce the influence of reflection between the light and the cylinder wall when the downhole camera collects images.

[0030] The cleaning device 3 is movably arranged inside the transparent cylinder 1. The cleaning device 3 includes a water supply pump 31, a water suction pump 32, an air pump 33, a water outlet nozzle 34, an air outlet nozzle 35 and a water suction head 36. The outlet of the water supply pump 31 is connected to the water outlet nozzle 34 through a water outlet pipe 37. The inlet of the water supply pump 31 is connected to a water source. The outlet of the air pump 33 is communicated with the air outlet nozzle 35 through a high-pressure air pipe 39. The inlet of the water suction pump 32 is communicated with the water suction head 36 through a water suction pipe 38. The water suction head 36 is of a sieve cage structure. The water outlet nozzle 34, the air outlet nozzle 35 and the water suction head 36 are movably arranged inside the transparent cylinder 1. The water pump inlet is connected to the water source through a pipeline. During cleaning, the water supply pump 31 is turned on, and the high-pressure water sent by the water supply pump 31 is sprayed out through the water outlet nozzle 34 to continuously clean the inner wall of the transparent cylinder 1. When there is water mist and severe water stains inside the transparent cylinder 1, the air pump 33 is turned on. The air pump 33 sends high-pressure air to the high-pressure air pipe 39 and then sprays it out through the air outlet nozzle 35. The water stains on the inner wall of the transparent cylinder 1 are blown off by the air pressure to achieve the effect of removing fog inside the transparent cylinder 1. After cleaning, the water supply pump 31 and the high-pressure air pump 33 are turned off, and the water suction pump 32 is turned on to suck away the water at the bottom of the transparent cylinder 1 through the water suction head 36.

[0031] Specifically, the water outlet pipe 37, the water suction pipe 38, and the high-pressure air pipe 39 are arranged inside the cleaning pipe 310. The cleaning pipe 310 is retracted and extended by a reel, and a fixed pulley for guiding the cleaning tank is installed at the drilling orifice; this facilitates unified operation and management. It also includes a cleaning head 311. The cleaning head 311 is fixed to the bottom end of the cleaning pipe 310. An annular water pipe 312 is provided on the upper part of the main body of the cleaning head 311. A number of obliquely arranged water spray nozzles 34 are communicated with the outer wall of the annular water pipe 312. The outlet of the water outlet pipe 37 is communicated with the annular water pipe 312. The high-pressure water sent by the water outlet pipe 37 first enters the annular water pipe 312 and then reaches each water spray nozzle 34. An annular air pipe 313 is provided on the lower side wall of the cleaning head 311. A number of air outlet nozzles 35 are communicated with the outer wall of the annular air pipe 313. The outlet of the high-pressure air pipe 39 is communicated with the annular air pipe 313. The high-pressure air sent by the high-pressure air pipe 39 first enters the annular air pipe 313 and then is ejected through each air outlet nozzle 35. A water suction head 36 is provided at the bottom of the cleaning head 311. The inlet of the water suction pipe 38 is communicated with the inlet of the water suction head 36. On the outer wall of the cleaning head 311 between the annular water pipe 312 and the annular air pipe 313, two blocking fans 314 with opposite blade directions are rotatably provided. When the pipe wall cleaning device 3 operates, the high-pressure air flow drives the blocking fans 314 to rotate, reducing the influence of the air flow on the high-pressure water flow and improving the cleaning effect of the inner wall of the transparent cylinder 1.

[0032] Installation and usage process:

[0033] (1) Insert the transparent cylinder 1 into the completed drilling.

[0034] (2) Pour high-strength and transparent liquid resin between the transparent cylinder 1 and the drilling hole wall to form a transparent filling layer 5.

[0035] (3) After the resin cools and solidifies to generate strength, simultaneously turn on the water pump 31 and the air pump 33, and slowly lower the cleaning head 311 and the downhole camera along the transparent cylinder 1 together. Use high-pressure water to clean the inner wall of the transparent cylinder 1 and use high-pressure air to wash away the water stains.

[0036] (4) When the cleaning head 311 reaches the bottom of the cylinder, turn off the high-pressure air pump 33 and the water pump 31, recover the downhole camera, turn on the suction pump 32, and suck away the accumulated liquid at the bottom of the cylinder.

[0037] (5) When there is water mist inside the transparent cylinder 1 and the water stains on the cylinder wall are relatively serious, turn on the air pump 33 to achieve the effect of removing the mist inside the transparent cylinder 1.

[0038] (6) After the transparent cylinder 1 is cleaned, lower the downhole camera again to collect images of the drilling hole wall.

[0039] 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 them; 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 described in the foregoing embodiments, or perform equivalent replacements for 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 long-term hole wall maintaining system for easily caving drill holes, characterized in that, it includes a transparent cylinder, a support frame and a cleaning device. The transparent cylinder is arranged inside the drill hole through the support frame, and a plurality of the support frames are arranged on the outer wall of the transparent cylinder; a transparent filling layer is arranged between the outside of the transparent cylinder and the inner wall of the drill hole; an anti-reflection coating is arranged on the inner wall of the transparent cylinder; the cleaning device is movably arranged inside the transparent cylinder; the cleaning device includes a water supply pump, a water suction pump, an air pump, a water outlet nozzle, an air outlet nozzle and a water suction head. The outlet of the water pump is connected to the water outlet nozzle through a water outlet pipe, the inlet of the water suction pump is communicated with the water suction head through a water suction pipe, and the outlet of the air pump is communicated with the air outlet nozzle through a high-pressure air pipe; the water outlet nozzle, the air outlet nozzle and the water suction head are movably arranged inside the transparent cylinder; it further includes a cleaning head. An annular water pipe is arranged on the upper part of the cleaning head body, and a plurality of the obliquely arranged water outlet nozzles are communicated with the outer wall of the annular water pipe. The outlet of the water outlet pipe is communicated with the annular water pipe; an annular air pipe is arranged on the lower side wall of the cleaning head, and a plurality of the air outlet nozzles are communicated with the outer wall of the annular air pipe. The outlet of the high-pressure air pipe is communicated with the annular air pipe; the water suction head is arranged at the bottom of the cleaning head, and the inlet of the water suction pipe is communicated with the inlet of the water suction head; two blocking fans with opposite blade directions are rotatably arranged on the outer wall of the cleaning head between the annular water pipe and the annular air pipe; the transparent cylinder includes a lower cylinder with a closed bottom end and an upper cylinder. The bottom end of the upper cylinder is connected to the top end of the lower cylinder through a connecting section.

2. A long-term hole wall maintaining system for easily caving drill holes according to claim 1, characterized in that, the support frame includes a fixed shaft, a fixed rod and a pulley. The fixed shaft is arranged horizontally, and both ends of the fixed shaft are fixedly connected to the outer wall of the transparent cylinder through the fixed rods. The pulley is rotatably arranged outside the fixed shaft.

3. A long-term hole wall maintaining system for easily caving drill holes according to claim 2, characterized in that, the fixed rod is a telescopic fixed rod, and both ends of the fixed shaft are fixedly connected to the outer wall of the transparent cylinder through two of the fixed rods; a spring is arranged between the fixed shaft and the transparent cylinder.

4. A long-term hole wall maintaining system for easily caving drill holes according to claim 3, characterized in that, a guide rod is fixed on the outer wall of the transparent cylinder between the two fixed rods. One end of the spring is sleeved outside the guide rod, and the other end of the spring is connected to the fixed shaft.

5. A long-term hole wall maintaining system for easily caving drill holes according to claim 1, characterized in that, the water outlet pipe, the water suction pipe and the high-pressure air pipe are arranged inside a cleaning pipe.

6. A long-term hole wall maintaining system for easily caving drill holes according to claim 1, characterized in that, The connecting section includes a flexible pipe and a plurality of rigid sleeves fixed to the outside of the flexible pipe; connecting pipes are respectively fixed to both ends of the flexible pipe, and the connecting pipes are connected to the bottom end of the corresponding upper barrel body or the top end of the lower barrel body through clamps.

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