A follow-up pipe drilling mechanism for landslide geological and geotechnical engineering exploration

Abstract

The present application relates to geological exploration drilling technical field, specifically is a kind of follow pipe drilling mechanism for landslide geotechnical engineering exploration, including drill pipe, eccentric drill tool, wall protection pipe, wall protection pipe lower side is threadedly connected with connecting sleeve, and filling unit for filling the gap between the outer wall of wall protection pipe and hole wall is arranged on connecting sleeve, the mechanism further includes the soil removal unit for supporting drill pipe and wall protection pipe coaxial and discharging geotechnical in wall protection pipe, the present application adopts several drum-shaped rollers to effectively block the geotechnical collapsed on hole wall, when lifting drill pipe and replacing sampler, the geotechnical stored in the inside of wall protection pipe is pushed out by the combination of soil guide cone and soil retaining ring, so as to prevent geotechnical from falling along the gap outside wall protection pipe and falling from the inside of wall protection pipe to target weak zone, fundamentally ensure the purity and geological representativeness of weak zone geotechnical sample obtained by sampler, lay a reliable foundation for subsequent accurate landslide stability calculation and scientific management design.

Description

Technical Field

[0001] This invention relates to the field of geological exploration drilling technology, specifically a casing drilling mechanism for landslide geological and geotechnical engineering exploration. Background Technology

[0002] As a typical geological hazard, the stability evaluation and treatment engineering design of landslides highly depend on the accurate acquisition of the real physical and mechanical parameters of the rock and soil in the weak zone (slip surface). Landslide geology is usually divided into landslide body, slip surface and slip bed from top to bottom. Taking this type of hazard, which is common in the southeastern coastal areas of my country, as an example, the landslide body is mainly composed of a layer of cohesive soil and gravel and strongly weathered welded tuff. The slip surface is a weak zone with significantly deteriorated mechanical properties, which is composed of completely weathered or strongly weathered rock fragments interspersed with soil and is easily softened when exposed to water.

[0003] In this structure, the shear strength parameter of the weak zone is the most crucial basis for quantitative calculation of landslide stability and anti-slide engineering design. Therefore, obtaining pure, undisturbed original samples of the weak zone during the exploration process is the fundamental prerequisite for ensuring the reliability of subsequent data analysis and the safety of engineering decisions.

[0004] Currently, when drilling and sampling in extremely unstable strata such as landslides, casing drilling has become an indispensable key technology. This technology achieves immediate support for the borehole wall by simultaneously pressing the casing into the hole while the drill bit breaks the strata, thereby effectively preventing the borehole from collapsing when passing through loose and broken landslide bodies and ensuring that the borehole can successfully reach the target stratum. After drilling to the target stratum, the drill rod needs to be pulled up and the drill bit replaced with a sampler. Then, the sampler is inserted into the hole to sample the weak zone.

[0005] However, to avoid the casing getting stuck or encountering excessive resistance during the drilling process, the outer diameter of the casing is usually designed to be smaller than the borehole diameter formed by the drill bit. This inevitably creates an annular gap between the borehole wall and the outer side of the casing. During drilling disturbances, especially when the drill bit penetrates the sliding body strata, this gap causes the soil and rock particles in the sliding body to lose effective lateral restraint. Under the influence of gravity and vibration, they are very prone to collapse. Furthermore, when the drill bit pulls out the casing, the soil and rock remaining inside the casing will also fall downwards.

[0006] These soil and rock particles from the landslide strata fall directly into and mix with the original material of the weak zone. As a result, the soil and rock samples taken by the sampler are actually a mixture of the original material of the weak zone and the collapsed soil and rock from the landslide, which loses their geological representativeness. The parameter values ​​obtained from the indoor physical and mechanical tests conducted with such distorted samples will deviate significantly from the actual strata. Landslide stability calculations and treatment designs based on erroneous parameters will directly lead to inaccurate engineering judgments and may seriously overestimate the stability of the landslide, thus creating huge engineering safety hazards.

[0007] Therefore, solving the problem of soil and rock contamination along both the inner and outer paths of the casing during drilling, and developing a drilling mechanism that can actively isolate the landslide body and ensure the purity of samples from the target strata (especially the weak zone), has become a key technical bottleneck that urgently needs to be overcome to improve the quality of landslide geological exploration and ensure the safety of disaster prevention projects. Summary of the Invention

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a casing drilling mechanism for landslide geological and geotechnical engineering exploration, including a drill rod, an eccentric drill bit, and a wall-supporting pipe. A connecting sleeve is threaded to the lower side of the wall-supporting pipe, and a filling unit is provided on the connecting sleeve to fill the gap between the outer wall of the wall-supporting pipe and the borehole wall. The mechanism also includes a soil-discharging unit for supporting the drill rod and the wall-supporting pipe to be coaxial and discharging the soil and rock inside the wall-supporting pipe.

[0009] The filling unit includes several drum-shaped rollers that are rotatably mounted on the connecting sleeve via a quick-release structure. During drilling, the drum-shaped rollers fill the gap between the outer wall of the protective pipe and the borehole wall, blocking any rock or soil falling into the gap.

[0010] The soil removal unit includes a support structure that is rotatably mounted on the outside of the drill rod, a soil guide cone that is fixedly installed on the upper side of the eccentric drill bit, and a soil retaining ring that is provided on the inner side of the lowest wall casing. During drilling, the support structure presses against the upper side of the soil retaining ring and supports the inner side of the wall casing. When moving upward, the soil guide cone and the soil retaining ring move upward synchronously, pushing the soil and rock out of the wall casing.

[0011] Exploration operations are carried out by using drum-shaped rollers to block the rock and soil on the outside of the retaining pipe, and by using retaining rings and guide cones to discharge the rock and soil on the inside of the retaining pipe.

[0012] Preferably, the quick-release structure includes a first column and a second column, which are interlocked and connected together.

[0013] Preferably, both column frame one and column frame two are connected to the connecting sleeve by studs, and the drum-shaped roller is rotatably connected to column frame two.

[0014] Preferably, the drum-shaped rollers are divided into two groups along the vertical direction, each group consisting of several drum-shaped rollers arranged at equal intervals along the circumference of the protective tube, and the two groups of drum-shaped rollers are staggered.

[0015] Preferably, the support structure includes a support frame detachably and rotatably connected to the lower outer side of the drill pipe, and rollers are rotatably provided on the outer side of the support frame.

[0016] Preferably, the upper outer part of the drill rod is provided with a boss for blocking the support frame, and the lower part of the drill rod is detachably connected with two retaining rings for blocking the support frame by studs.

[0017] Preferably, the lowermost drill rod is threadedly connected to the eccentric drill bit. During drilling, the drill rod pushes the retaining ring through the support frame and rollers, thereby driving the wall protection pipe to move downward.

[0018] Preferably, the lower and upper sides of the guide cone are both conical. When the drill rod is pulled up, the upper conical surface of the guide cone is completely attached to the lower side of the retaining ring, thereby pushing the retaining ring upward.

[0019] Preferably, the retaining ring is axially slidably nested inside the bottommost protective wall pipe, and the upper and lower sides of the retaining ring are both inclined surfaces with the inner side higher than the outer side. A blocking ring matching the inclination of the lower side of the retaining ring is welded to the lower part of the inner side of the protective wall pipe.

[0020] Preferably, the inner diameter of the blocking ring is larger than the outer diameter of the eccentric drill bit after shrinkage, and the inner diameter of the blocking ring is larger than the outer diameter of the soil guide cone.

[0021] The beneficial effects of this invention are as follows: First, this invention uses several drum-shaped rollers to effectively block the collapsed rock and soil on the borehole wall. When the drill rod is pulled up to replace the sampler, the rock and soil accumulated inside the protective pipe are pushed out by the combination of the soil guide cone and the soil retaining ring. This prevents the rock and soil from falling along the gap on the outside of the protective pipe and from falling into the target weak zone from inside the protective pipe. This fundamentally ensures the purity and geological representativeness of the rock and soil samples obtained by the sampler from the weak zone, laying a reliable foundation for subsequent accurate landslide stability calculations and scientific treatment design.

[0022] Second, the present invention employs two sets of staggered drum-shaped rollers, whose outer surfaces can closely fit the borehole wall, effectively filling the annular gap between the outer side of the protective pipe and the borehole wall. This prevents the rock and soil that collapses from the sliding body from being blocked and supported by the drum-shaped rollers. As the protective pipe moves down with the drilling tool, the drum-shaped rollers roll into contact with the borehole wall, thereby preventing the rock and soil from falling into the target weak zone along the gap between the outer side of the protective pipe and the borehole wall while ensuring the smooth downward movement of the protective pipe.

[0023] Third, this invention employs a soil guide cone that moves upwards and combines with a retaining ring, ensuring that the combination of the soil guide cone and the retaining ring completely fills the inner transverse space of the retaining pipe. When the drill rod is pulled up, the combination of the soil guide cone and the retaining ring pushes the remaining soil and rock inside the retaining pipe upwards as a whole, further ensuring that the soil and rock inside the retaining pipe will not contaminate the lower weak zone, thus ensuring the correctness of the landslide stability evaluation and treatment design basis in the sample acquisition stage. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is an overall front view of the invention during drilling.

[0026] Figure 2 This is a partial cross-sectional view of the present invention.

[0027] Figure 3 This is a structural separation diagram of the connecting sleeve, drum-shaped roller, column frame two, and column frame one in this invention.

[0028] Figure 4 This is a top view of the drum-shaped roller in this invention.

[0029] Figure 5 This is a partial sectional view of the retaining wall pipe, soil guiding cone, soil retaining ring and support frame in this invention.

[0030] Figure 6 This is a diagram showing the state of the drill pipe being pulled up in this invention.

[0031] In the diagram: 1. Drill rod; 2. Eccentric drill bit; 3. Connecting sleeve; 4. Casing pipe; 5. Filling unit; 6. Soil removal unit; 51. Quick-release structure; 52. Drum roller; 61. Support structure; 62. Soil guide cone; 63. Soil retaining ring; 511. Column frame one; 512. Column frame two; 611. Support frame; 612. Roller; 613. Boss; 614. Clamping ring; 631. Retaining ring. Detailed Implementation

[0032] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0033] See Figure 1 A casing drilling mechanism for landslide geological and geotechnical engineering exploration includes a drill rod 1 threadedly connected to a drilling rig, with an eccentric drill bit 2 threadedly connected to the lower end of the drill rod 1 at the bottom. The mechanism also includes a wall protection pipe 4.

[0034] During drilling, the drilling rig drives the drill rod 1, the eccentric drill tool 2 and the casing 4 to move downwards synchronously. The operator intermittently connects the lower end of the new drill rod 1 to the upper part of the uppermost drill rod 1, and then connects the upper end of the new drill rod 1 to the drilling rig. At the same time, the new casing 4 is nested and threaded onto the uppermost casing 4, thus continuing the casing drilling process.

[0035] See Figure 1 and Figure 2 The lower side of the protective tube 4 is threaded with a connecting sleeve 3. The connecting sleeve 3 is provided with a filling unit 5 to fill the gap between the outer wall of the protective tube 4 and the hole wall. The mechanism also includes a soil discharge unit 6 for supporting the drill rod 1 and the protective tube 4 to be coaxial and for discharging the soil and rock inside the protective tube 4.

[0036] See Figure 2 , Figure 5 and Figure 6 The soil removal unit 6 includes a support structure 61 that is rotatably mounted on the outside of the drill rod 1. A soil guide cone 62 is fixedly installed on the upper side of the eccentric drill bit 2. A soil retaining ring 63 is provided on the inner side of the lowest wall protection pipe 4. During drilling, the support structure 61 supports the drill rod 1 by pressing on the upper side of the soil retaining ring 63 and supporting it on the inner side of the wall protection pipe 4. When moving upward, the soil guide cone 62 and the soil retaining ring 63 move upward synchronously, pushing the soil and rock out of the wall protection pipe 4.

[0037] See Figure 5 and Figure 6 The retaining ring 63 is axially slidably nested inside the bottommost protective wall pipe 4. The upper and lower sides of the retaining ring 63 are both inclined surfaces with the inner side higher than the outer side. A blocking ring 631 that matches the inclination of the lower side of the retaining ring 63 is welded to the lower part of the inner side of the protective wall pipe 4.

[0038] During drilling, the drilling rig pushes the drill rod 1 downward, causing the drill rod 1 to drive the support structure 61 to abut against the retaining ring 63, and pushes the retaining ring 63 downward, causing the retaining ring 63 to abut against the blocking ring 631. This causes the blocking ring 631 to drive the lowest wall casing 4 to move downward synchronously with the drill rod 1, performing the casing drilling process. At this time, the guide cone 62 is located below the retaining ring 63, and there is a gap between the retaining ring 63 and the guide cone 62.

[0039] Furthermore, during the drilling process, the rock and soil in the hole move upward under the action of drilling pressure, causing the rock and soil to move upward along the outside of the eccentric drill bit 2 into the connecting sleeve 3, and then move upward from the connecting sleeve 3 into the wall protection pipe 4. Subsequently, the rock and soil move along the outside of the guide cone 62 to the inside of the blocking ring 631 and the retaining ring 63, and then the rock and soil are actively discharged upward along the inside of the wall protection pipe 4 to the outside of the hole.

[0040] It is worth noting that when the upward-moving rock and soil passes between the guide cone 62 and the retaining ring 63, the rock and soil are compacted at this point due to the small gap between the guide cone 62 and the retaining ring 63. This reduces the looseness of the rock and soil during discharge to a certain extent and further prevents the rock and soil from falling back into the hole.

[0041] To ensure that the drill rod 1 is coaxially positioned inside the casing 4 during drilling, the present invention designs the following structure: (See attached diagram) Figure 2 , Figure 5 and Figure 6 The support structure 61 includes a support frame 611 detachably and rotatably connected to the lower outer side of the drill rod 1. A roller 612 is rotatably arranged on the outer side of the support frame 611. During drilling, the support frame 611 drives the roller 612 to abut against the inner side of the protective wall tube 4. The protective wall tube 4 supports the drill rod 1 in sequence through the roller 612 and the support frame 611, so that the drill rod 1 is kept in the coaxial position with the corresponding protective wall tube 4, preventing the drill rod 1 from bumping and rubbing against the soil retaining ring 63.

[0042] During drilling, the retaining ring 63 slides axially and nests inside the bottommost protective pipe 4. The bottommost drill rod 1, through its support frame 611, drives the roller 612 to press against the upper side of the retaining ring 63, so that the retaining ring 63 is pressed against the blocking ring 631 by the downward pressure of the roller 612. This not only limits the position of the retaining ring 63, but also transmits the downward pressure of the drill rod 1 to the protective pipe 4 through the blocking ring 631, so that the protective pipe 4 and the drill rod 1 move down synchronously. At this time, the lower side of the retaining ring 63 and the lower side of the blocking ring 631 combine to form a guide surface that guides the discharged rock and soil inward, preventing the rock and soil from getting stuck in the lower part of the retaining ring 63.

[0043] It should be noted that in this embodiment, a support frame 611 is connected to each drill rod 1, so that each section of the wall protection tube 4 can support and limit the drill rod 1 at the corresponding position. In actual application, the number of support frames 611 can be appropriately reduced according to the decrease in drilling depth, thereby improving drilling efficiency.

[0044] To facilitate quick assembly and disassembly of the support frame 611, the present invention is designed with the following structure: (See attached diagram) Figure 5 and Figure 6 The upper outer side of the drill rod 1 is provided with a boss 613 for blocking the support frame 611, and the lower part of the drill rod 1 is detachably connected with two retaining rings 614 for blocking the support frame 611 by studs.

[0045] When it is necessary to connect the support frame 611 to the drill rod 1, simply insert the support frame 611 through the outside of the drill rod 1, and make the upper side of the support frame 611 abut against the boss 613. At this time, the two retaining rings 614 are combined and clamped on the outside of the drill rod 1, so that the retaining rings 614 together block the lower end of the support frame 611, thereby rotatably connecting the support frame 611 and the drill rod 1 together.

[0046] It should be noted that a sealed bearing is fixedly installed inside the support frame 611. The support frame 611 is rotatably connected to the drill rod 1 through the bearing. In addition, after the support frame 611 is connected to the drill rod 1, it can be reused repeatedly without the need for on-site connection and installation each time.

[0047] See Figure 1 , Figure 2 , Figure 3 and Figure 4 The filling unit 5 includes several drum-shaped rollers 52 that are rotatably mounted on the connecting sleeve 3 via a quick-release structure 51. During drilling, the drum-shaped rollers 52 fill the gap between the outer wall of the protective tube 4 and the hole wall, blocking the rock and soil falling into the gap.

[0048] See Figure 2 , Figure 3 and Figure 4The drum-shaped rollers 52 are divided into two groups along the vertical direction. Each group consists of several drum-shaped rollers 52 arranged at equal intervals along the circumference of the protective tube 4. The two groups of drum-shaped rollers 52 are staggered so that the two groups of drum-shaped rollers 52 are combined together in the axial direction, thereby filling the gap between the outer wall of the protective tube 4 and the hole wall through the combination of the drum-shaped rollers 52.

[0049] During drilling, the connecting sleeve 3, through the quick-release structure 51, drives several drum-shaped rollers 52 on it to abut against the borehole wall drilled by the eccentric drill bit 2. The combination of several drum-shaped rollers 52 blocks the rock and soil that collapses between the outer side of the wall-protecting pipe 4 and the borehole wall, thereby preventing the rock and soil from falling into the target weak zone along the gap on the outer side of the wall-protecting pipe 4. This effectively ensures the purity and geological representativeness of the rock and soil samples obtained by the sampler from the weak zone. Furthermore, during the downward movement of the wall-protecting pipe 4, the drum-shaped rollers 52 roll and contact the borehole wall, ensuring the smooth progress of the casing drilling operation.

[0050] To enable rapid replacement of worn drum rollers 52, the present invention incorporates the following structure: (See attached diagram) Figure 2 and Figure 3 The quick-release structure 51 includes a first column frame 511 and a second column frame 512. The first column frame 511 and the second column frame 512 are connected together by interlocking. The first column frame 511 and the second column frame 512 are both connected to the connecting sleeve 3 by studs. The drum-shaped roller 52 is rotatably connected to the second column frame 512.

[0051] When replacing the drum roller 52, the operator removes column frame 1 511 and column frame 2 512, separates column frame 1 511 and column frame 2 512, thereby sliding the drum roller 52 off column frame 2 512, and slides the new drum roller 52 onto column frame 2 512. Then, column frame 1 511 and column frame 2 512 are slidably inserted together, and finally, column frame 1 511 and column frame 2 512 are connected to the connecting sleeve 3 by studs, thus completing the replacement of the drum roller 52.

[0052] It should be noted that the drum roller 52 is made of wear-resistant material, which makes its replacement frequency extremely low. Once replaced, it can be used continuously for a long time.

[0053] See Figure 6 The inner diameter of the blocking ring 631 is larger than the outer diameter of the eccentric drill bit 2 after contraction, and the inner diameter of the blocking ring 631 is larger than the outer diameter of the soil guide cone 62. When the eccentric drill bit 2 drills to one to two meters above the weak zone, the drilling stops, the drill rod 1 is reversed, causing the eccentric drill bit 2 to contract. Then, the drill rod 1 is lifted by the drilling rig, causing the drill rod 1 to drive the eccentric drill bit 2 to move upward.

[0054] See Figure 5 and Figure 6The lower and upper sides of the guide cone 62 are both conical. When the drill rod 1 is pulled up, the drill rod 1 drives the support frame 611 to move upward, so that the roller 612 no longer presses on the retaining ring 63. At the same time, the drill rod 1 drives the guide cone 62 to move upward through the eccentric drill tool 2, so that the guide cone 62 passes through the retaining ring 631. Then the upper conical surface of the guide cone 62 completely fits on the lower side of the retaining ring 63, thereby pushing the retaining ring 63 upward.

[0055] This allows the soil guide cone 62 and the retaining ring 63 to be combined together, pushing the soil and rock inside the retaining pipe 4 upward as a whole. This further ensures that the soil and rock inside the retaining pipe 4 will not contaminate the lower weak zone, thus ensuring the correctness of the landslide stability evaluation and treatment design basis in the sample acquisition stage.

[0056] When the eccentric drill bit 2 is pulled out of the hole, the operator installs the sampler on the lowest drill rod 1, and then uses the drilling machine to send the sampler into the hole through several sections of drill rod 1 until the sampler is inserted into the weak zone for sampling.

[0057] In this invention, the wall protection tube 4 only protects the borehole wall during exploration. The outer diameter of the extended eccentric drill bit 2 is larger than the outer diameter of the connecting sleeve 3. After exploration, the retracted eccentric drill bit 2 is passed through the connecting sleeve 3 again to the lower part of the connecting sleeve 3 through the pipe lifting process, and the eccentric drill bit 2 is unfolded. Then, the eccentric drill bit 2 is directly lifted and the wall protection tube 4 is moved out of the borehole through the connecting sleeve 3. This makes the wall protection tube 4 in this invention reusable and not a disposable consumable.

[0058] Although the invention introduces a certain increase in cost due to the addition of components such as drum rollers 52, retaining rings 63 and support structures 61, these cost investments are fully focused on and applied to the specific and stringent engineering requirement of undisturbed sampling of weak geological zones in landslides, representing a targeted optimization of this technical bottleneck.

[0059] This invention does not claim to absolutely and completely prevent every particle of rock and soil in the landslide from falling into the weak zone, which is difficult to achieve in engineering practice. Its substantial progress lies in the fact that this invention can significantly reduce the large amount of rock and soil contamination caused by falling from both inside and outside the retaining pipe 4, thereby controlling the sampling distortion within the range that is permissible and acceptable in engineering, and fundamentally improving the representativeness of the obtained samples. This is a significant improvement in the authenticity of key geological parameters at the expense of limited cost, which has extremely high engineering practical value and significant technological progress in avoiding the risk of misjudgment of landslide stability and failure of control projects caused by data distortion.

[0060] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0061] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0062] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0063] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A casing drilling mechanism for landslide geological and geotechnical engineering exploration, comprising a drill rod, an eccentric drill bit, and a casing pipe, characterized in that, The lower side of the protective pipe is threaded with a connecting sleeve, and the connecting sleeve is provided with a filling unit to fill the gap between the outer wall of the protective pipe and the borehole wall. The mechanism also includes a soil discharge unit for supporting the drill rod and the protective pipe to be coaxial and for discharging the soil and rock inside the protective pipe. The filling unit includes several drum-shaped rollers that are rotatably mounted on the connecting sleeve via a quick-release structure. During drilling, the drum-shaped rollers fill the gap between the outer wall of the protective pipe and the borehole wall, blocking the rock and soil falling into the gap. The soil removal unit includes a support structure that is rotatably mounted on the outside of the drill rod, a soil guide cone that is fixedly installed on the upper side of the eccentric drill bit, and a soil retaining ring that is provided on the inner side of the bottom wall pipe. When drilling, the support structure presses on the upper side of the soil retaining ring and supports the inner side of the wall pipe. When moving upward, the soil guide cone and the soil retaining ring move upward synchronously to push the soil and rock out of the wall pipe. The lower and upper sides of the soil guide cone are both conical. When the drill rod is pulled up, the upper conical surface of the soil guide cone is completely attached to the lower side of the retaining ring, thereby pushing the retaining ring upward. Exploration operations are carried out by using drum-shaped rollers to block the rock and soil on the outside of the retaining pipe, and by using retaining rings and guide cones to discharge the rock and soil on the inside of the retaining pipe.

2. The casing drilling mechanism for landslide geological and geotechnical engineering exploration according to claim 1, characterized in that, The quick-release structure includes a first column and a second column, which are interlocked and connected together.

3. The casing drilling mechanism for landslide geological and geotechnical engineering exploration according to claim 2, characterized in that, Both column frame one and column frame two are connected to the connecting sleeve by studs, and the drum-shaped roller is rotatably connected to column frame two.

4. The casing drilling mechanism for landslide geological and geotechnical engineering exploration according to claim 1, characterized in that, The drum-shaped rollers are divided into two groups along the vertical direction. Each group consists of several drum-shaped rollers arranged at equal intervals along the circumference of the protective tube. The two groups of drum-shaped rollers are staggered.

5. A casing drilling mechanism for landslide geological and geotechnical engineering exploration according to claim 1, characterized in that, The support structure includes a support frame that is detachably and rotatably connected to the lower part of the outside of the drill pipe, and rollers are rotatably provided on the outside of the support frame.

6. A casing drilling mechanism for landslide geological and geotechnical engineering exploration according to claim 5, characterized in that, The upper outer side of the drill rod is provided with a boss for blocking the support frame, and the lower part of the drill rod is detachably connected with two retaining rings for blocking the support frame via studs.

7. A casing drilling mechanism for landslide geological and geotechnical engineering exploration according to claim 5, characterized in that, The lowest drill rod is threadedly connected to the eccentric drill bit. During drilling, the drill rod pushes the retaining ring through the support frame and rollers, thereby driving the wall protection pipe to move downward.

8. A casing drilling mechanism for landslide geological and geotechnical engineering exploration according to claim 1, characterized in that, The retaining ring is axially slidably nested inside the bottommost protective wall pipe. The upper and lower sides of the retaining ring are both inclined surfaces with the inner side higher than the outer side. A blocking ring that matches the inclination of the lower side of the retaining ring is welded to the lower part of the inner side of the protective wall pipe.

9. A casing drilling mechanism for landslide geological and geotechnical engineering exploration according to claim 8, characterized in that, The inner diameter of the blocking ring is larger than the outer diameter of the eccentric drill bit after shrinkage, and the inner diameter of the blocking ring is larger than the outer diameter of the soil guide cone.

Images