Drill bit and hollow free-drilling rod

Abstract

The utility model discloses a drill bit relates to high side slope weathered rock mass management technical field, including drill bit main part and fin seat, the bottom of drill bit main part is provided with the drilling mechanism, still be provided with the perfusion hole on drill bit main part, and the fin seat sets up at the top of drill bit main part, the top of fin seat is used for connecting the drill rod main part, and the hollow channel is set up along its axial direction in the drill rod main part, is provided with the injection cavity in the fin seat, and the injection cavity is communicated with the hollow channel of drill rod main part through the injection channel, and injection cavity still is communicated with the perfusion hole of drill bit main part, the top of drill bit main part still is provided with a plurality of fins along the circumference, and a plurality of fins are arranged around the fin seat, and a plurality of fin grooves are arranged along the circumference on the lateral wall of fin seat, and the tension hole is also arranged in the fin groove, and the tension hole is communicated with the injection cavity. The utility model discloses still a kind of hollow free pulling drill rod, including drill rod main part and the drill bit as described above. The utility model can simplify construction procedure, and improve the reinforcement effect to rock slope.

Description

Technical Field

[0001] This utility model relates to the field of weathered rock mass treatment technology for high slopes, and in particular to a drill bit and a hollow, non-extractable drill rod. Background Technology

[0002] Weathered rock masses on high slopes refer to rock formations in high mountains or steep slopes that have been subjected to long-term natural weathering. Under the continuous influence of various environmental factors such as wind, rain, and temperature changes, these rock masses gradually undergo physical and chemical changes, leading to a looser structure, reduced strength, and ultimately, the formation of an unstable geological body. The presence of such weathered rock masses often poses a potential threat to the stability and safety of slopes, easily triggering geological disasters such as landslides and collapses. Therefore, effective monitoring and remediation measures must be taken to ensure engineering safety and ecological stability.

[0003] Currently, slope reinforcement is usually achieved through drilling and grouting. However, the existing drilling and grouting methods mainly involve drilling holes with drill rods, pulling out the drill rods after drilling, and then grouting. This process is cumbersome and the reinforcement effect is poor.

[0004] Therefore, a drill bit and a hollow, pull-out-free drill rod are provided to solve the above-mentioned problems existing in the prior art. Utility Model Content

[0005] The purpose of this invention is to provide a drill bit and a hollow, non-extractable drill rod to solve the problems existing in the prior art, simplify the construction steps, and improve the reinforcement effect on rock slopes.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a drill bit, including a drill bit body and a vane seat. A drilling mechanism is provided at the bottom of the drill bit body, and an injection hole is also provided on the drill bit body. The vane seat is located at the top of the drill bit body. The top of the vane seat is used to connect to a drill rod body. A hollow channel is provided through the drill rod body along its axial direction. An injection cavity is provided in the vane seat. The injection cavity is connected to the hollow channel of the drill rod body through an injection channel, and the injection cavity is also connected to the injection hole of the drill bit body. The drill bit body has multiple circumferentially arranged blades on its top, which surround the blade seat. The bottom of any blade is rotatably connected to the drill bit body, allowing the blades to close or unfold. Multiple blade grooves are circumferentially arranged on the sidewall of the blade seat, each corresponding to a blade. Each blade groove contains a tension-aiding hole connected to the injection chamber. When the blades close, they enter the corresponding blade groove and cover the corresponding tension-aiding hole. When gas is injected into the injection chamber and the gas pressure exceeds a specified value, the gas pushes the blades to unfold.

[0007] Preferably, the drilling mechanism includes blades, and multiple blades are evenly distributed circumferentially on the bottom of the drill bit body, and multiple cutting teeth are sequentially arranged on each blade along the radial direction of the drill bit body.

[0008] Preferably, the drill bit body is made of niobium-tungsten alloy, and the cutting teeth are made of polycrystalline diamond composite sheet.

[0009] Preferably, the diameter of the drill bit body is 20-100mm.

[0010] Preferably, the injection holes are located at the bottom of the drill bit body, and a plurality of injection holes are evenly distributed along the circumference of the drill bit body, with the plurality of injection holes and the plurality of cutter wings being staggered.

[0011] Preferably, the top of the drill bit body is provided with a plurality of rotating seats evenly distributed along the circumference, and the plurality of rotating seats are arranged in a one-to-one correspondence with the plurality of blades, and the bottom of the blade is rotatably mounted on the corresponding rotating seat via a rotating shaft.

[0012] Preferably, the diameter of the tension-aiding hole is larger than the diameter of the injection channel, and when the vanes are closed, the tension-aiding hole is located behind the centroid of the corresponding vane.

[0013] Preferably, a receiving cavity is provided at the bottom of the side wall of the wing holder corresponding to the wing.

[0014] This utility model also provides a hollow, non-extractable drill rod, including a drill rod body and a drill bit as described above, wherein the bottom of the drill rod body is connected to the top of the blade seat of the drill bit.

[0015] Preferably, the drill rod body comprises multiple hollow drill rod segments connected in sequence, and adjacent hollow drill rod segments are threaded together.

[0016] The present invention achieves the following technical advantages over the prior art: This utility model discloses a drill bit for treating weathered rock masses on high slopes. It mainly comprises a drill bit body and a blade seat. The bottom of the drill bit body is equipped with a drilling mechanism for drilling. The drill bit body also has a grouting hole for grouting. The blade seat is located at the top of the drill bit body. The top of the blade seat connects to a drill rod body. A hollow channel is axially integrated within the drill rod body, allowing for the injection of water, grouting materials, and gas. An injection cavity is located within the blade seat, connected to the hollow channel of the drill rod body via an injection channel. The injection cavity is also connected to the grouting hole of the drill bit body, enabling water injection, grouting, and gas injection. The top of the drill bit body also has multiple circumferentially arranged blades. The drill bit consists of multiple blades arranged around a blade holder, with the bottom of each blade rotatably connected to the drill bit body, allowing the blades to close or unfold. Multiple blade grooves are circumferentially arranged on the sidewall of the blade holder, each corresponding to a blade. Each blade groove also contains a tension-aiding hole, which communicates with the injection cavity. When the blades close, they enter their corresponding blade grooves and cover the corresponding tension-aiding holes. When gas is injected and the gas pressure exceeds a specified value, the high-pressure gas is discharged through the tension-aiding holes, thus pushing the blades to unfold. Once unfolded, the blades are firmly anchored within the rock mass, improving pull-out resistance and ensuring effective reinforcement of the rock slope.

[0017] The drill bit body of this invention is equipped with a drilling mechanism at its bottom for drilling. The drill bit body also has a grouting hole for grouting. Furthermore, the drill bit is connected to the drill rod body. After grouting is completed, both the drill bit and the drill rod body remain within the grouting hole, acting as anchors. They are solidified with the grouting material to form an integral anchoring support, improving the reinforcement effect on rock slopes. Moreover, this invention can complete drilling, grouting, and anchoring in one operation, achieving drill rod-free hole formation. This simplifies the traditional drill rod removal process while reinforcing rock slopes, reducing construction time and costs. Furthermore, the top of the drill bit body of this invention is equipped with multiple rotating blades. When the blades are deployed, they can be firmly anchored inside the rock mass, improving pull-out resistance and further ensuring the reinforcement effect on rock slopes. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the drill bit structure in an embodiment of this utility model; Figure 2 This is a schematic diagram of the blade deployment of the drill bit in an embodiment of this utility model; Figure 3 for Figure 2 Bottom view of the drill bit; Figure 4 This is a schematic diagram of the hollow drill rod section in an embodiment of the present invention; Figure 5 This is a schematic diagram of drilling in an embodiment of the present invention; Figure 6 This is a schematic diagram of rock slope reinforcement in an embodiment of this utility model; Figure 7 for Figure 6 AA sectional view.

[0020] In the figure: 1-Drill bit body, 101-Cutter blade, 102-Rotating seat, 103-Flange, 104-Cutting teeth, 2-Flange seat, 201-Injection channel, 202-Injection cavity, 203-Tension aid hole, 204-Receiving cavity, 3-Drill rod body, 301-Hollow drill rod. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The purpose of this invention is to provide a drill bit and a hollow, non-extractable drill rod to solve the problems existing in the prior art, simplify the construction steps, and improve the reinforcement effect on rock slopes.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 like Figures 1-7As shown, this embodiment provides a drill bit that can be used for the treatment of weathered rock masses on high slopes. It mainly includes a drill bit body 1 and a blade seat 2. The bottom of the drill bit body 1 is provided with a drilling mechanism for drilling. The drill bit body 1 also has an injection hole for injection. The blade seat 2 is located at the top of the drill bit body 1. The top of the blade seat 2 is used to connect to a drill rod body 3. A hollow channel is provided axially through the drill rod body 3, which can inject water, grouting material, and gas. An injection cavity 202 is provided inside the blade seat 2. The injection cavity 202 is connected to the hollow channel of the drill rod body 3 through an injection channel 201, and the injection cavity 202 is also connected to the injection hole of the drill bit body 1 to realize water injection, grouting, and gas injection. The top of the drill bit body 1 also has multiple blades 103 arranged circumferentially. 03 is arranged around the blade seat 2, and the bottom of any blade 103 is rotatably connected to the drill bit body 1 so that multiple blades 103 can close or unfold; multiple blade grooves are arranged circumferentially on the side wall of the blade seat 2, and the blade grooves are arranged one-to-one with the blades 103. Each blade groove is also provided with a tension-aiding hole 203, which is connected to the injection cavity 202. When multiple blades 103 close, the blades 103 can enter the corresponding blade groove and cover the corresponding tension-aiding hole 203; when gas is injected and the gas pressure exceeds a specified pressure value (e.g., 2 MPa), the high-pressure gas can be discharged through the tension-aiding hole 203, thereby pushing the blades 103 to unfold. After the blades 103 are unfolded, they can be firmly anchored inside the rock mass, improving the pull-out resistance and ensuring the reinforcement effect on the rock slope.

[0025] In this embodiment, the bottom of the drill bit body 1 is equipped with a drilling mechanism for drilling. The drill bit body 1 also has a grouting hole for grouting. Furthermore, the drill bit is connected to the drill rod body 3. After grouting is completed, both the drill bit and the drill rod body 3 remain inside the grouting hole, acting as anchors and solidifying with the grouting material to form an integral anchoring support, thus improving the reinforcement effect on the rock slope. Moreover, this embodiment can complete drilling, grouting, and anchoring in one operation, achieving drill rod-free hole-forming technology. This eliminates the need to pull out the drill rod, simplifying the traditional drill rod removal process while reinforcing the rock slope, reducing construction time and costs. Further, in this embodiment, the top of the drill bit body 1 is rotatably equipped with multiple blades 103. When the blades 103 are deployed, they can be firmly anchored inside the rock mass, improving pull-out resistance and further ensuring the reinforcement effect on the rock slope.

[0026] In this embodiment, it should be noted that the number of blades 103 on the drill bit body 1 can be selected according to specific working needs, preferably 3-6, and the number of blade slots on the blade seat 2 corresponds to the number of blades 103.

[0027] In this embodiment, the drilling mechanism includes blades 101. Multiple blades 101 are evenly distributed circumferentially on the bottom of the drill bit body 1, and multiple cutting teeth 104 are sequentially arranged on each blade 101 along the radial direction of the drill bit body 1. The radially arranged multi-cutting tooth structure enables the drill bit to break rocks evenly and efficiently during rotation, reducing drilling resistance and increasing drilling speed.

[0028] In this embodiment, the required hardness characteristics of the drill bit vary depending on the degree of weathering of the rock mass. Specifically, for rock masses with a light degree of weathering and relatively hard texture, a drill bit with higher hardness is required to ensure drilling efficiency and quality. For rock masses with a heavy degree of weathering and relatively soft texture, a drill bit with relatively lower hardness should be selected to avoid excessive wear and damage to the drill bit.

[0029] As one possible implementation, the drill bit body 1 can be made of niobium-tungsten alloy, which has high strength, hardness and high temperature resistance, and is suitable for high-intensity drilling operations. Especially in complex geological conditions such as weathered rock masses, it can effectively resist impact and wear, and extend the service life of the drill bit. The cutting teeth 104 can be made of polycrystalline diamond composite sheet. Polycrystalline diamond composite sheet (PDC) is one of the hardest cutting materials currently available. It has extremely high wear resistance and impact resistance, and is suitable for cutting hard rock layers, which significantly improves drilling efficiency.

[0030] In this embodiment, different sizes of drill bits are used for different rock fracture conditions to meet various reinforcement requirements. As one possible implementation, the diameter of the drill bit body 1 can be 20-100mm. Specifically, for rocks with a rock integrity index greater than 0.75, a drill bit body 1 with a diameter of 100mm is selected; for fractured rocks with a rock integrity index between 0.75 and 0.35, a drill bit body 1 with a diameter of 50mm is selected; and for extremely fractured rocks with a rock integrity index less than 0.35, a drill bit body 1 with a diameter of 20mm is selected.

[0031] In this embodiment, the injection hole can be set at the bottom of the drill bit body 1, and multiple injection holes are evenly distributed along the circumference of the drill bit body 1. The multiple injection holes are staggered with the multiple cutter wings 101, that is, an injection hole is provided between two adjacent cutter wings 101.

[0032] In this embodiment, the top of the drill bit body 1 is evenly distributed with multiple rotating seats 102 along the circumference. The multiple rotating seats 102 are arranged in a one-to-one correspondence with the multiple blades 103. The bottom of the blades 103 is rotatably mounted on the corresponding rotating seat 102 via a rotating shaft, so as to facilitate closing or unfolding.

[0033] In this embodiment, the diameter of the tension-enhancing hole 203 is larger than the diameter of the injection channel 201, which can generate a greater thrust on the vane 103, helping to push the vane 103 to unfold. Furthermore, when the vane 103 closes, the tension-enhancing hole 203 is located behind the center of mass of the corresponding vane 103, so as to facilitate the smooth opening of the vane 103.

[0034] In this embodiment, a receiving cavity 204 is also provided at the bottom of the side wall of the wing seat 2 corresponding to the wing 103, providing space for the rotation of the wing 103.

[0035] This embodiment also provides a hollow, non-extractable drill rod, including a drill rod body 3 and a drill bit as described above, wherein the bottom of the drill rod body 3 is connected to the top of the blade seat 2 of the drill bit.

[0036] In this embodiment, the drill rod body 3 includes multiple hollow drill rod segments 301 connected in sequence, and adjacent hollow drill rod segments 301 are threaded together. Specifically, an internal thread segment can be provided at the top of the hollow drill rod 301, and an external thread segment can be provided at the bottom. The threaded connection is achieved by the external thread segment at the bottom of the hollow drill rod 301 engaging with the internal thread segment at the top of the next hollow drill rod 301. This threaded connection method not only facilitates the installation and disassembly of the hollow drill rod 301, but also significantly improves the stability and durability of the overall structure, ensuring efficient and safe drilling operations.

[0037] In this embodiment, as one possible implementation, the hollow drill rod 301 can be made of alloy materials such as 4140 / 42CrMo alloy and 4340 / 40CrNiMoA. Each section of the hollow drill rod 301 can be 3.0 meters long, 80 millimeters in diameter, and 11 millimeters thick.

[0038] In this embodiment, the vane seat 2 of the drill bit body 1 can be connected to the lowest hollow drill rod 301. At this time, the top of the vane seat 2 needs to be provided with an internal thread section that can cooperate with the external thread section at the bottom of the hollow drill rod 301.

[0039] Alternatively, the top of the blade seat 2 of the drill bit body 1 may be provided with a hollow connecting rod section, the top of which is provided with an internal thread section and is threadedly connected to the bottom hollow drill rod 301.

[0040] In this embodiment, the grouting material can be magnesium oxide grouting material, and the introduced gas can be CO2. The magnesium oxide grouting material is mainly composed of magnesium oxide dry powder, fine sand, and urease, with a mass percentage of 20%:70%:10%. Using magnesium oxide dry powder instead of traditional cement, urease can promote the reaction between magnesium oxide and the active ingredients in the fine sand, improving the curing effect. Fine sand can increase the internal porosity of the grouting material, enabling it to absorb CO2 more efficiently during the curing process, thereby enhancing the strength and durability of the grouting material.

[0041] The construction method for treating weathered rock masses on high slopes in this embodiment is as follows: Construction Preparation: Before construction, a construction organization design for the grouting project must be developed, temporary facilities planned, and safety and environmental protection measures ensured. Temporary facilities, such as ventilation, water, electricity, and magnesium oxide grouting materials, should meet the needs of peak construction periods, and key processes should have backup resources and dedicated lines. When constructing on steep slopes, unstable rocks must be removed to ensure the grouting platform is stable and can withstand construction machinery. When constructing on inclines or shafts, the lifting equipment capacity must be verified, and anti-slip braking measures must be taken.

[0042] Grouting Test: To ensure the quality and effectiveness of grouting, a series of key technical parameters must be determined through testing. These parameters include, but are not limited to, hole spacing (the distance between adjacent grouting holes); row spacing (the distance between different rows of grouting holes); hole depth (the depth of the grouting hole); hole layout (the arrangement and pattern of the grouting holes); grouting sequence (the order in which the holes are grouted during the grouting process); and grouting pressure (the pressure applied during the grouting process). Through scientific and reasonable testing, these technical parameters can be accurately determined, thus providing a reliable technical basis for subsequent grouting construction and ensuring the safety and stability of the project.

[0043] Grouting material preparation: Mix fine sand (70%), magnesium oxide dry powder (20%), and urease (10%) evenly, then add an appropriate amount of water to the mixture and mix evenly again.

[0044] drilling: 1. All boreholes shall be uniformly numbered.

[0045] 2. The deviation between the opening position and the final hole depth and the design should not exceed 20cm.

[0046] 3. The borehole diameter should be small, not less than [a certain value]. 50mm.

[0047] 4. During drilling, details such as water inflow, leakage, and return water color should be recorded in detail as a basis for analyzing the drilling and grouting area and taking corresponding measures. This information must also be reflected in the grouting results table.

[0048] Opening the wing 103: Under the action of high-pressure gas, the wing 103 unfolds and is firmly anchored inside the rock mass.

[0049] Punching: Use the hollow drill rod 301 to flush the hole wall (punching) and the fissures (fracturing) until the return water is clear and continues for 10 minutes.

[0050] Pressure test: 1. Select representative grouting holes for pre-grouting water pressure test. The test section should be no less than 10% of the total number of holes.

[0051] 2. The pressure for the water pressure test shall be 80% of the grouting pressure for that section of the borehole.

[0052] 3. The standard for stable water absorption in the pressure test is as follows: After adjusting the pressure to the specified value and keeping it stable, measure the flow rate every 5 minutes for four consecutive times. When the test results meet one of the following standards, the test can be completed, and the final measured flow rate is used as the calculated flow rate.

[0053] Grouting: Grouting is carried out using a comprehensive grouting method based on the designed grouting pressure, grout concentration and other parameters.

[0054] 1. Grouting pressure: 0.2MPa for sequence I holes, and up to 0.3MPa for sequence II holes depending on the situation; 2. In the event of pressurized water, the influence of the pressurized water head should be considered, and the grouting pressure should be appropriately increased to ensure the grouting quality.

[0055] 3. The control of grouting pressure should be considered in conjunction with the geological conditions, permeability, grout absorption rate, grout consistency and its changes in the grouting area. Generally, when the grout absorption rate is low, thin grout should be used to reach the specified pressure in a shorter time; when the grout absorption rate is high, thick grout should be used to gradually increase the pressure to the specified pressure.

[0056] If the estimated grout intake per unit pressure is no more than 30 L / min, and geological conditions permit, the "single-stage pressure increase method" can be used preferentially. However, if the grout intake per unit pressure exceeds 30 L / min, or if geological conditions do not permit, the "graded (two to three-stage) pressure increase method" should be used to control the grouting pressure. The initial upper and lower limits for the unit grout intake per unit pressure are 50 L / min and 30 L / min, respectively, to control whether the pressure is reduced or increased. Specific details regarding the applicable locations, number of stages and grade differences, and upper and lower limits for the two pressure increase methods will be further discussed and adjusted on-site.

[0057] 4. Pressure gauges should be installed on all return grout pipes at the borehole opening. The pressure peak of each pressure gauge should be recorded. Pressure control and adjustment should be based on the pressure of the return grout pipe pressure gauge. However, when the grout intake in the borehole is large and there is no return grout, the grouting pressure should be adjusted by the pressure of the grout inlet pipe to prevent lifting and damage due to overpressure.

[0058] 5. A bladder-type emulsion preventer can be installed under the pressure gauge to prevent the gauge from malfunctioning due to slurry blockage.

[0059] Grouting completion criteria: (1) Under the specified pressure, if the unit grouting volume of a single hole is not greater than 0.4L / min, continue grouting for another 30 minutes to end the grouting.

[0060] (2) If the unit grouting volume of a single hole is less than 1L / min under the specified pressure and continues for 60min, the grouting can also be stopped.

[0061] Carbonization: Carbonization is carried out by introducing high-pressure carbon dioxide for 24 hours.

[0062] Quality inspection: The grouting quality can be checked to see if it meets the design requirements by means of water pressure test, core sampling and analysis through inspection holes.

[0063] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A drill bit, characterized in that: The drill bit body includes a drill bit body and a vane seat. A drilling mechanism is provided at the bottom of the drill bit body, and an injection hole is also provided on the drill bit body. The vane seat is located at the top of the drill bit body. The top of the vane seat is used to connect to the drill rod body. A hollow channel is provided through the drill rod body along its axial direction. An injection cavity is provided in the vane seat. The injection cavity is connected to the hollow channel of the drill rod body through an injection channel, and the injection cavity is also connected to the injection hole of the drill bit body. The drill bit body has multiple circumferentially arranged blades on its top, which surround the blade seat. The bottom of any blade is rotatably connected to the drill bit body, allowing the blades to close or unfold. Multiple blade grooves are circumferentially arranged on the sidewall of the blade seat, each corresponding to a blade. Each blade groove contains a tension-aiding hole connected to the injection chamber. When the blades close, they enter the corresponding blade groove and cover the corresponding tension-aiding hole. When gas is injected into the injection chamber and the gas pressure exceeds a specified value, the gas pushes the blades to unfold.

2. The drill bit according to claim 1, characterized in that: The drilling mechanism includes blades, and multiple blades are evenly distributed circumferentially on the bottom of the drill bit body, and multiple cutting teeth are sequentially arranged on each blade along the radial direction of the drill bit body.

3. The drill bit according to claim 2, characterized in that: The drill bit body is made of niobium-tungsten alloy, and the cutting teeth are made of polycrystalline diamond composite sheet.

4. The drill bit according to claim 1, characterized in that: The diameter of the drill bit body is 20-100mm.

5. The drill bit according to claim 2, characterized in that: The injection holes are located at the bottom of the drill bit body, and multiple injection holes are evenly distributed along the circumference of the drill bit body. The multiple injection holes are staggered with the multiple cutter wings.

6. The drill bit according to claim 1, characterized in that: The top of the drill bit body is evenly distributed with multiple rotating seats along the circumference. Each of the multiple rotating seats is arranged in a one-to-one correspondence with a multiple of the blades. The bottom of each blade is rotatably mounted on the corresponding rotating seat via a rotating shaft.

7. The drill bit according to claim 1, characterized in that: The diameter of the tension-aiding hole is larger than the diameter of the injection channel, and when the vanes are closed, the tension-aiding hole is located behind the centroid of the corresponding vane.

8. The drill bit according to claim 1, characterized in that: A receiving cavity is also provided at the bottom of the side wall of the wing holder, corresponding to the position of the wing.

9. A hollow, non-extractable drill rod, characterized in that: It includes a drill pipe body and a drill bit as described in any one of claims 1-8, wherein the bottom of the drill pipe body is connected to the top of the blade seat of the drill bit.

10. The hollow, non-extractable drill rod according to claim 9, characterized in that: The drill rod body comprises multiple hollow drill rod sections connected in sequence, and adjacent hollow drill rod sections are threaded together.

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