Recharge well construction equipment suitable for bedrock fracture water-rich stratum and method thereof

Abstract

The invention discloses recharge well construction equipment suitable for a bedrock fracture water-rich stratum and a method of the recharge well construction equipment, and mainly relates to the technical field of rock coring drilling machines. Comprising a supporting frame, a lifting adjuster is slidably connected to the surface of the supporting frame, a micro drilling machine is installed on one side of the lifting adjuster, a drilling barrel is installed at the output end of the micro drilling machine, fixing pins are arranged on the two sides of the supporting frame, the section of each fixing pin is in a T shape, and an adjusting device is arranged on the surface of the upper end of the supporting frame and comprises a fixing column. The coring device has the beneficial effects that the problems that in the whole recharge well construction operation process, coring operation needs to be conducted by means of a handheld micro drilling machine, at the moment, the micro drilling machine is likely to cause violent shaking of the whole supporting frame, the drilling position of the whole micro drilling machine is deviated, and the coring effect is affected are solved. And the problem that the whole micro drilling machine is inconvenient to operate and use due to the fact that the obtained rock core sample is fractured is solved.

Description

Technical Field

[0001] The invention relates to the technical field of rock coring drilling machines, and in particular to a reinjection well construction device suitable for bedrock fissure water-rich strata and a method thereof. Background Art

[0002] Weathered bedrock coring handheld drilling machine is a kind of equipment specially used for coring in weathered or broken bedrock, usually used in geological exploration and mineral resource investigation. The structural design of reinjection wells in bedrock fissure water-rich strata is in water resource management and groundwater restoration. Such strata usually have abundant fissures and pores that can store and conduct water. At the same time, the structural design of reinjection wells aims to improve the water reinjection efficiency and ensure the sustainable use of groundwater resources. It is more common in geotechnical survey and construction.

[0003] Prior art includes an invention with publication number CN106593359A, which discloses a wellbore structure for a reinjection well, comprising: a pump chamber pipe, a reinjection pipe, a reinjection pipe, a reinjection pump, and a well pipe. The reinjection pipe is located inside the pump chamber pipe, and the length of the reinjection pipe is greater than the dynamic water level during mining. The reinjection pump is installed at the bottom of the reinjection pipe, and the reinjection pipe is installed on the outside of the pump chamber pipe. The bottom end is connected to the pump chamber pipe and the extended part of the well pipe through an elbow; the pump chamber pipe is connected to the well pipe below it through a reducer, and the well pipe is extended upward by 5m from the reducer. The bottom of the reinjection pipe is connected to the well pipe through a tee, and the well pipe at the tee is not sealed; the reinjection inlet is below the reinjection pump and is vertical up and down; the reinjection wellbore structure provided by the invention is suitable for reinjection projects that require reinjection, greatly reduces the operational difficulty of reinjection, and saves reinjection costs.

[0004] During the geotechnical survey and construction, it was found that during the entire recharge well construction operation, a handheld micro-drilling machine was needed to carry out the coring operation. At this time, the micro-drilling machine could easily cause the entire support frame to shake violently, resulting in the deviation of the drilling position of the entire micro-drilling machine and the fracture of the core samples taken, which made it inconvenient to operate the entire micro-drilling machine.

[0005] The present application provides a technical solution to the technical problem, aiming to provide technical personnel in the field with a variety of options for solving the problem. Summary of the invention

[0006] The purpose of the present invention is to solve the problem in the prior art that during the entire recharging well construction operation, it is necessary to use a handheld micro-drilling machine to carry out the coring operation, which can easily cause the micro-drilling machine to cause the entire support frame to shake violently, thereby causing the drilling position of the entire micro-drilling machine to shift and the core sample to break, making it inconvenient to operate and use the entire micro-drilling machine.

[0007] In order to solve the above problems, the present invention provides a reinjection well construction equipment and method suitable for bedrock fissure water-rich strata.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a reinjection well construction equipment suitable for bedrock fissure water-rich strata, comprising a support frame, a lifting regulator is slidably connected to the surface of the support frame, a micro-drilling machine is installed on one side of the lifting regulator, a drill tube is installed on the output end of the micro-drilling machine, fixing pins are arranged on both sides of the support frame, the cross-section of the fixing pin is "T"-shaped, an adjustment device is arranged on the upper end surface of the support frame, the adjustment device comprises a fixing column, the bottom end of the fixing column is fixedly connected to the upper surface of the support frame, a fixing frame and a docking frame are respectively abutted on both sides of the arc surface of the fixing column, the cross-sections of the fixing frame and the docking frame are arc-shaped, a fixing rope is rotatably connected to the surface of one side of the fixing frame and the docking frame away from each other, the bottom end of the fixing rope is rotatably connected to one side of the fixing pin, and a card slot is opened on the two end surfaces of the fixing frame and the docking frame, and the same card frame is inserted into the inner walls of the two card slots, and the card frame is an elastic frame.

[0009] The effect achieved by the above components is: in the process of coring and taking soil from hard and moderately weathered bedrock using a handheld desktop micro-drilling machine, in order to avoid the micro-drilling machine from shaking and shifting in position, which may cause the core to break, the micro-drilling machine can be protected and limited in position with the help of an adjusting device. The fixed column at the upper end of the support frame can be used to fix the fixed frame and the docking frame on both sides of the fixed column, and then the steel wire ropes on both sides of the fixed frame and the docking frame are pulled, and the position of the entire support frame is stretched and fixed by the steel wire ropes and the fixing pins.

[0010] Preferably, a fixing rod is fixedly connected to the upper end surface of the fixing column, and a movable tube is sleeved on the surface of the fixing rod and the fixing column, and limiting plates are fixedly connected to both sides of the surface of the movable tube, and the bottom end cross-section of the limiting plate is "U"-shaped, and the arc surfaces of the fixing frame and the docking frame are fixedly connected to the limiting column, and the arc surface of the limiting column is clamped with the bottom end of the limiting plate.

[0011] The effect achieved by the above components is that when the fixed frame and the docking frame are fixed and limited, the limiting plates and limiting columns on both sides of the movable tube can be clamped together, thereby effectively and conveniently protecting the position of the entire fixed frame and the docking frame to avoid falling off.

[0012] Preferably, the arc surface of the fixed rod is sleeved with a spring, and two ends of the spring are fixedly connected to the moving tube and the fixed rod respectively.

[0013] The effect achieved by the above components is that the extrusion force generated by the spring can be used to extrusion and limit the position of the moving tube sliding on the surface of the fixed rod, thereby preventing the moving tube from shaking.

[0014] Preferably, a friction sleeve is fixedly connected to the arc surface of the fixing column, and the surface of the friction sleeve is provided with anti-slip grooves.

[0015] The effect achieved by the above components is that when the fixing frame and the docking frame are docked and fixed, the friction sleeve on the surface of the fixing column can be used to increase the friction, thereby preventing the fixing frame and the docking frame from loosening and falling off.

[0016] Preferably, the fixing rope is a steel wire rope for improving the strength of use, and the length of the fixing rope is adapted to the length of the support frame.

[0017] The effect achieved by the above components is that the fixing rope made of steel wire can be used for a long time, thereby preventing the fixing rope from breaking due to long-term use.

[0018] Preferably, the cross section of the card frame is in a "U" shape, and the cross sections of both ends of the card frame are in a pointed cone shape.

[0019] The effect achieved by the above components is that, by virtue of the pointed cone-shaped cross sections at both ends of the card frame, the card frame can be conveniently engaged and limited with the card slots provided on both sides of the fixed frame and the docking frame.

[0020] Preferably, an auxiliary device is provided on the surface of the fixing pin, and the auxiliary device includes two connecting grooves, and the two connecting grooves are respectively opened on the two side surfaces of the fixing pin, the inner wall of the connecting groove is fixedly connected with a connecting rod, the arc surface of the connecting rod is rotatably connected with a rotating plate, the bottom end cross-section of the rotating plate is in the shape of a barb, and the inner wall of the fixing pin is provided with a sliding groove, and the inner wall of the sliding groove is slidably penetrated by a moving block, the cross-section of the moving block is trapezoidal, and the upper surface of the moving block is rotatably connected with an extrusion rod, and the arc surface of the extrusion rod is threadedly penetrated by the surface of the fixing pin.

[0021] The effect achieved by the above components is: when limiting the position of the micro drilling machine, it is plugged and fixed to the ground with the help of a fixing pin. At this time, in order to better limit the position of the entire fixing pin, an extrusion rod that rotates through the thread on the surface of the fixing pin is used to drive the trapezoidal moving block in the slide groove to move up and down, thereby squeezing the rotating plates on both sides of the fixing pin. At this time, the rotating plates are squeezed and fixed on both sides, which effectively and conveniently squeezes and fixes the position of the entire fixing pin.

[0022] Preferably, the arc surfaces at both ends of the connecting rod are sleeved with coil springs, and the two ends of the coil spring are fixedly connected to the rotating plate and the fixing pin respectively.

[0023] The effect achieved by the above components is that the torsional force generated by the coil spring can assist in limiting and fixing the position of the arc surface rotating plate of the connecting rod.

[0024] Preferably, the cross section of the moving block is trapezoidal, and the moving block is a stainless steel block.

[0025] The effect achieved by the above components is: with the help of the trapezoidal moving block made of stainless steel, it can be used for a long time and the moving block is prevented from rusting.

[0026] A method for constructing a recharging well suitable for a water-rich bedrock fracture formation comprises the following steps: S1. Pipe well construction is used in the strata above the medium weathered rock. The steel pipe diameter is 325mm, the hole diameter is 800mm, and the well depth is 1m into the medium weathered rock strata. Below the bottom of the well, Ф85 core drilling is used, with a depth of 10m below the basement; S2. Use manual excavation from top to bottom and use pneumatic picks and hammer drills to excavate the loose layer. When entering the moderately weathered bedrock, use a handheld desktop micro-drill to core and extract soil from the hard moderately weathered bedrock to reduce the disturbance of the hole wall rock mass. The excavation sequence is to first excavate the surrounding rock mass, and then divide the rock mass in the hole into small pieces. The cross-sectional allowable error is 30mm, the vertical deviation is less than 0.5%, and the excavation depth does not exceed 1m at a time. The abandoned soil is loaded into the bucket; S3. When using a handheld desktop micro-drilling machine to coring and taking soil from hard and medium-weathered bedrock, first place the support frame at the specified position, then fix the micro-drilling machine and the lifting and lowering adjuster that slides on the surface of the support frame, then dock and fix the drill tube with the output end of the micro-drilling machine, and then start the micro-drilling machine for operation. At the same time, in order to prevent the micro-drilling machine from shaking and deviating from its position, causing the core to break, the micro-drilling machine can be protected and limited in position with the help of an adjusting device. In summary, the beneficial effects of the present invention are: In the present invention, in the process of coring and taking soil from hard and moderately weathered bedrock using a handheld desktop micro-drilling machine, in order to avoid the micro-drilling machine from shaking and deviating in position, which may cause the core to break, the micro-drilling machine can be protected and limited in position with the help of an adjusting device. The fixed column at the upper end of the support frame is used to fix the fixed frame and the docking frame on both sides of the fixed column, and then the steel wire ropes on both sides of the fixed frame and the docking frame are pulled, and the position of the entire support frame is stretched and fixed by the steel wire ropes and the fixing pins. By operating the adjusting device, the docking limit between the fixed frame, the docking frame and the fixed column is achieved, thereby effectively and conveniently supporting and limiting the position of the entire support frame and avoiding the displacement of the position of the micro-drilling machine.

[0027] In the present invention, when the position of the micro drilling machine is limited, it is plugged and fixed to the ground with the help of a fixing pin. At this time, in order to better limit the position of the entire fixing pin, an extrusion rod that rotates through the thread on the surface of the fixing pin is used to drive the trapezoidal moving block in the slide groove to move up and down, thereby squeezing the rotating plates on both sides of the fixing pin. At this time, the rotating plates are squeezed and fixed toward both sides to effectively limit the position. By operating the auxiliary device, the position of the entire fixing pin can be effectively and conveniently squeezed and fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Attached Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Attached Figure 2 It is a partial schematic diagram of the three-dimensional structure of the present invention; Attached Figure 3 It is a partial structural schematic diagram of the micro drilling machine of the present invention; Attached Figure 4 is a schematic structural diagram of the regulating device of the present invention; Attached Figure 5 It is a schematic diagram of the disassembled structure of the regulating device of the present invention; Attached Figure 6 is a schematic structural diagram of the auxiliary device of the present invention; Attached Figure 7 is a schematic cross-sectional structural diagram of the auxiliary device of the present invention; Attached Figure 8 It is a schematic diagram of the process structure of the present invention.

[0029] Numbers shown in the accompanying drawings: 1. support frame; 2. lifting regulator; 3. micro drilling machine; 4. adjusting device; 401. fixed column; 402. fixed rod; 403. spring; 404. fixed frame; 405. docking frame; 406. moving tube; 407. limiting plate; 408. limiting column; 409. slot; 410. slot; 411. friction sleeve; 412. fixing rope; 5. fixing pin; 6. drill tube; 7. auxiliary device; 71. rotating plate; 72. coil spring; 73. connecting rod; 74. connecting groove; 75. extrusion rod; 76. moving block; 77. slide groove. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0031] Reference Figures 1 to 8As shown, the present invention provides a technical solution: a reinjection well construction equipment and method suitable for bedrock fissure water-rich strata, comprising a support frame 1, a lifting regulator 2 is slidably connected to the surface of the support frame 1, a micro drilling machine 3 is installed on one side of the lifting regulator 2, a drill tube 6 is installed on the output end of the micro drilling machine 3, fixing pins 5 are arranged on both sides of the support frame 1, the cross-section of the fixing pin 5 is "T" shaped, an adjusting device 4 is arranged on the upper end surface of the support frame 1, and an auxiliary device 7 is arranged on the surface of the fixing pin 5.

[0032] The specific settings and functions of the adjusting device 4 and the auxiliary device 7 are described in detail below.

[0033] Reference Figure 4 , Figure 5 As shown, in this embodiment: the adjusting device 4 includes a fixed column 401, the bottom end of the fixed column 401 is fixedly connected to the upper surface of the support frame 1, and the two sides of the arc surface of the fixed column 401 are respectively abutted with a fixed frame 404 and a docking frame 405, the cross-sections of the fixed frame 404 and the docking frame 405 are arc-shaped, and the fixed frame 404 and the docking frame 405 are rotatably connected to the surface of the side away from each other by a fixing rope 412, and the bottom end of the fixing rope 412 is rotatably connected to one side of the fixing pin 5, and the surfaces of both ends of the fixed frame 404 and the docking frame 405 are provided with a card slot 409, and the inner walls of the two card slots 409 are plugged with the same card frame 410, and the card frame 410 is an elastic frame, and the upper end surface of the fixed column 401 is fixedly connected with a fixed rod 402, and the fixed rod 402 and the surface of the fixed column 401 are provided with a movable sleeve Tube 406, both sides of the surface of the movable tube 406 are fixedly connected to limit plates 407, the bottom end cross-section of the limit plate 407 is "U"-shaped, the arc surfaces of the fixed frame 404 and the docking frame 405 are fixedly connected to limit columns 408, the arc surface of the limit column 408 is snap-fitted with the bottom end of the limit plate 407, the arc surface of the fixed rod 402 is sleeved with a spring 403, the two ends of the spring 403 are respectively fixedly connected to the movable tube 406 and the fixed rod 402, the arc surface of the fixed column 401 is fixedly connected with a friction sleeve 411, the surface of the friction sleeve 411 is provided with anti-slip grooves, the fixed rope 412 is a steel wire rope for improving the strength of use, the length of the fixed rope 412 is adapted to the length of the support frame 1, the cross-section of the clamping frame 410 is "U"-shaped, and the cross-sections of the two ends of the clamping frame 410 are pointed cones.

[0034] Reference Figure 6 , Figure 7As shown, in this embodiment: the auxiliary device 7 includes two connecting grooves 74, and the two connecting grooves 74 are respectively provided on the two side surfaces of the fixed pin 5, and the inner wall of the connecting groove 74 is fixedly connected with a connecting rod 73, and the arc surface of the connecting rod 73 is rotatably connected with a rotating plate 71, and the bottom end cross-section of the rotating plate 71 is in the shape of a barb, and the inner wall of the fixed pin 5 is provided with a sliding groove 77, and the inner wall of the sliding groove 77 is slidably penetrated by a moving block 76, and the upper surface of the moving block 76 is rotatably connected with an extrusion rod 75, and the arc surface of the extrusion rod 75 is threadedly penetrated by the surface of the fixed pin 5, and the arc surfaces at both ends of the connecting rod 73 are both sleeved with coil springs 72, and the two ends of the coil spring 72 are respectively fixedly connected to the rotating plate 71 and the fixed pin 5, and the cross-section of the moving block 76 is trapezoidal, and the moving block 76 is a stainless steel block.

[0035] Detailed description of usage: When using the handheld desktop micro-drilling machine 3 to coring and taking soil from hard and moderately weathered bedrock, first place the support frame 1 at the specified position, then fix the micro-drilling machine 3 and the lifting and lowering adjuster 2 that slides on the surface of the support frame 1, then dock and fix the drill tube 6 with the output end of the micro-drilling machine 3, and then start the micro-drilling machine 3 for operation. In order to prevent the micro-drilling machine 3 from shaking and deviating in position, which may cause the core to break, the micro-drilling machine 3 can be protected and limited in position with the help of the adjusting device 4. First, dock the docking frame 405 with a semicircular cross-section with the fixed frame 404 and the fixed column 401, and limit the docking frame 405, the fixed frame 404 and the fixed column 401 at the upper end of the support frame 1, and use the friction sleeve 411 made of rubber to assist. To assist in protection, the moving tube 406 on the upper surface of the fixed column 401 is then pulled, so that the moving tube 406 can limit the limit plates 407 fixed on both sides of the moving tube 406 with the help of the tensile force generated by the spring 403, so that the limit plates 407 with a "U" shape at the bottom are plugged and fixed with the limit columns 408 on the surfaces of the docking frame 405 and the fixed frame 404 to prevent the fixed frame 404 from separating and falling off from the docking frame 405. Then, the "U"-shaped card frame 410 made of elastic material is plugged and fixed with the card slots 409 on both sides of the fixed frame 404 and the docking frame 405. Then, the fixed rope 412 made of steel wire that is rotatably connected to the surface of the fixed frame 404 and the docking frame 405 is plugged and fixed with the fixing pin 5 at the bottom to the ground surface, so that the entire micro drilling machine 3 can be more stable when in use.

[0036] When the fixing rope 412 made of steel wire is used in combination with the fixing pin 5, in order to stably limit the position between the fixing pin 5 and the ground surface, with the help of the connecting grooves 74 opened on both sides of the upper surface of the fixing pin 5 and the connecting rod 73 in the connecting grooves, the rotating plate 71 on the surface of the connecting plate is abutted and limited by the torsional force generated by the coil springs 72 at both ends of the arc surface of the connecting rod 73. In this process, after the entire fixing pin 5 is inserted into the ground, the squeezing rod 75 is rotated to allow the squeezing rod 75 to drive the moving block 76 with a trapezoidal cross-section to slide along the sliding groove 77, and the two ends of the moving block 76 abut against the rotating plate 71. At this time, the position of the entire rotating plate 71 will move to both sides, which can effectively fix and limit the position of the entire fixing pin 5 to avoid falling off.

Claims

1. A reinjection well construction device suitable for bedrock fissure water-rich strata, comprising a support frame (1), characterized in that: The surface of the support frame (1) is slidably connected to a lifting regulator (2), a micro-drilling machine (3) is installed on one side of the lifting regulator (2), and a drill tube (6) is installed on the output end of the micro-drilling machine (3). Fixed pins (5) are provided on both sides of the support frame (1), and the cross-section of the fixed pins (5) is "T"-shaped. The upper end surface of the support frame (1) is provided with an adjustment device (4), and the adjustment device (4) includes a fixed column (401), the bottom end of the fixed column (401) is fixedly connected to the upper surface of the support frame (1), and the arc surface of the fixed column (401) on both sides is fixedly connected to the upper surface of the support frame (1). A fixing frame (404) and a docking frame (405) are respectively abutted against each other, the cross-sections of the fixing frame (404) and the docking frame (405) are arc-shaped, a fixing rope (412) is rotatably connected to the surface of the fixing frame (404) and the docking frame (405) on one side away from each other, the bottom end of the fixing rope (412) is rotatably connected to one side of a fixing pin (5), and a card slot (409) is provided on both end surfaces of the fixing frame (404) and the docking frame (405), and the same card frame (410) is inserted into the inner walls of the two card slots (409), and the card frame (410) is an elastic frame.

2. The recharging well construction equipment suitable for bedrock fissure water-rich strata according to claim 1 is characterized by: The upper end surface of the fixed column (401) is fixedly connected to a fixed rod (402), and the surfaces of the fixed rod (402) and the fixed column (401) are sleeved with a moving tube (406), and both sides of the surface of the moving tube (406) are fixedly connected to a limiting plate (407), and the bottom end cross-section of the limiting plate (407) is "U"-shaped, and the arc surfaces of the fixed frame (404) and the docking frame (405) are fixedly connected to the limiting column (408), and the arc surface of the limiting column (408) is snap-fitted to the bottom end of the limiting plate (407).

3. The recharging well construction equipment suitable for bedrock fissure water-rich strata according to claim 2 is characterized by: The arc surface of the fixed rod (402) is sleeved with a spring (403), and the two ends of the spring (403) are respectively fixedly connected to the moving tube (406) and the fixed rod (402).

4. The recharging well construction equipment suitable for bedrock fissure water-rich strata according to claim 1 is characterized by: The arc surface of the fixed column (401) is fixedly connected to a friction sleeve (411), and the surface of the friction sleeve (411) is provided with anti-slip grooves.

5. The recharging well construction equipment suitable for bedrock fissure water-rich strata according to claim 1 is characterized by: The fixing rope (412) is a steel wire rope with improved usage strength, and the length of the fixing rope (412) is compatible with the length of the support frame (1).

6. The recharging well construction equipment suitable for bedrock fissure water-rich strata according to claim 1 is characterized by: The cross section of the card frame (410) is in a "U" shape, and the cross sections of both ends of the card frame (410) are in a pointed cone shape.

7. The recharging well construction equipment suitable for bedrock fissure water-rich strata according to claim 1 is characterized by: The surface of the fixing pin (5) is provided with an auxiliary device (7), the auxiliary device (7) comprising two connecting grooves (74), the two connecting grooves (74) being respectively provided on the two side surfaces of the fixing pin (5), the inner wall of the connecting groove (74) being fixedly connected with a connecting rod (73), the circular arc surface of the connecting rod (73) being rotatably connected with a rotating plate (71), the bottom end cross section of the rotating plate (71) being in the shape of a barb, the inner wall of the fixing pin (5) being provided with a sliding groove (77), the inner wall of the sliding groove (77) being slidably penetrated with a moving block (76), the upper surface of the moving block (76) being rotatably connected with an extrusion rod (75), the circular arc surface of the extrusion rod (75) being threadedly penetrated with the surface of the fixing pin (5).

8. The recharging well construction equipment suitable for bedrock fissure water-rich strata according to claim 7 is characterized by: The arc surfaces at both ends of the connecting rod (73) are sleeved with coil springs (72), and the two ends of the coil spring (72) are fixedly connected to the rotating plate (71) and the fixing pin (5) respectively.

9. The recharging well construction equipment suitable for bedrock fissure water-rich strata according to claim 7, characterized in that: The cross section of the moving block (76) is trapezoidal, and the moving block (76) is a stainless steel block.

10. A method for constructing a recharging well suitable for water-rich bedrock fissures, using the recharging well construction equipment suitable for water-rich bedrock fissures as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Pipe well construction is used in the strata above the medium weathered rock. The steel pipe diameter is 325mm, the hole diameter is 800mm, and the well depth is 1m into the medium weathered rock strata. Below the bottom of the well, Ф85 core drilling is used, with a depth of 10m below the basement; S2. Manual excavation is carried out from top to bottom using pneumatic picks and hammer drills to excavate the loose layer. When entering the moderately weathered bedrock, a handheld desktop micro-drill (3) is used to core the hard moderately weathered bedrock to reduce the disturbance to the rock mass of the hole wall. The excavation sequence is to first excavate the surrounding rock mass, and then divide the rock mass in the hole into small pieces. The cross-sectional error is allowed to be 30 mm, the vertical deviation is less than 0.5%, and the excavation depth does not exceed 1 m at a time. The abandoned soil is loaded into a bucket; S3. In the process of coring and taking soil from hard medium-weathered bedrock using a handheld desktop micro-drilling machine (3), the support frame (1) is first placed at a specified position, and then the micro-drilling machine (3) and the lifting and lowering regulator (2) sliding on the surface of the support frame (1) are fixed and limited. Then, the drill tube (6) is docked and fixed with the output end of the micro-drilling machine (3), and then the micro-drilling machine (3) is started for operation. At the same time, in order to prevent the micro-drilling machine (3) from shaking and deviating in position, causing the core to break, the micro-drilling machine (3) can be protected and limited in position with the help of the adjustment device (4).

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