Method for manufacturing a roller cutter suitable for finishing the rock surface at the bottom of a large-diameter rock-socketed pile hole

Abstract

The application relates to the technical field of rock-socketed piles and discloses a method for manufacturing a rotary cutter drill bit suitable for finishing a large-diameter rock-socketed pile hole bottom rock surface, which comprises the following steps: providing a rotary drilling cylinder, cutting off the cutting teeth and the roller of the bottom of the rotary drilling cylinder to form a cylinder body with a bottom opening; providing a bottom plate, wherein the bottom plate comprises a lower end face and an upper end face, the insert toothed cutter and the roller drill bit are arranged on the lower end face, the grinding track of the insert toothed cutter and the roller drill bit completely covers the lower end face, the bottom of the cylinder body is welded and fixed on the upper end face, and the bottom plate is covered on the bottom opening; the bottom cutting teeth and the roller of the rotary drilling cylinder on a rotary drilling machine are cut off, the bottom plate provided with the insert toothed cutter and the roller drill bit is welded on the bottom opening to form a rotary cutter drill bit, the rotary drilling cylinder is combined with the insert toothed cutter, the rotary cutter drill bit is used for full-face finishing and grinding of a concave-convex or stepped hole bottom, the hole bottom is made flat, the pile sinking quality is ensured, and the working efficiency is improved.

Description

Technical Field

[0001] This invention relates to the technical field of rock-socketed piles, and more specifically, to a method for manufacturing a roller drill bit suitable for trimming the rock surface at the bottom of large-diameter rock-socketed pile holes. Background Technology

[0002] In hard rock drilling of large-diameter embedded piles with a diameter of 1600mm or more, staged reaming and coring drilling or small-drill array coring drilling is usually adopted. Staged reaming drilling uses a small-diameter rotary drilling rig to drill from the center of the pile to collect the core, gradually increasing the drilling diameter in stages until the designed pile diameter is reached. Small-drill array coring drilling uses the same small-diameter cutting tooth cylinder drill, collects the core sequentially in an array, and then uses a cylinder drill of the designed pile diameter to flatten the entire pile in one go.

[0003] However, they all have the following problems: during the drilling process of rotary drilling rigs, due to the influence of the degree of development of rock fissures and different rock hardness, regardless of whether the staged hole expansion process or the small drill array core sampling process is used, the bottom elevation of the rock core will be different in each drilling and core sampling. Finally, after the hole is formed, the bottom of the hole will be uneven or stepped.

[0004] In existing technologies, core drilling cannot achieve leveling of uneven or stepped hole bottoms. Therefore, in actual construction, most holes are not leveled after drilling, posing a certain risk to the quality of pile formation. Alternatively, a small-diameter cylinder drill biting and fracturing process can be used, where a small-diameter cylinder drill bit is used to drill through multiple holes to fracture and level the uneven rock surface at the bottom of the hole. This process requires repeated movement of the cylinder and multiple slag removals from the bottom of the hole, resulting in slow construction speed and poor treatment effect. Another option is to use a rotary drilling rig equipped with a roller drill bit to grind the bottom of the hole, but this requires changing the drilling rig during construction, which is time-consuming and costly. Summary of the Invention

[0005] The purpose of this invention is to provide a method for manufacturing a roller drill bit suitable for finishing the rock surface at the bottom of large-diameter rock-socketed pile holes. This method aims to solve the problem in the prior art that it is difficult to handle the unevenness at the bottom of the hole after drilling large-diameter rock-socketed piles in hard rock, resulting in poor pile quality.

[0006] This invention is implemented as follows: a method for manufacturing a roller drill bit suitable for trimming the bottom rock surface of large-diameter embedded rock pile holes, comprising the following steps:

[0007] 1) Provide a cylindrical rotary drilling barrel, and cut off the cutting teeth and rollers at the bottom of the rotary drilling barrel to form a barrel with a bottom opening;

[0008] 2) Provide a base plate, the base plate including a lower end face arranged downward and an upper end face arranged upward, a plurality of hob cutter supports and roller cone drill bits are mounted on the lower end face, the plurality of hob cutter supports and roller cone drill bits are arranged at intervals on the lower end face; the hob cutter support includes a base plate, the two ends of the base plate respectively have mounting brackets extending downward, the two mounting brackets are arranged at intervals to form a mounting area;

[0009] A toothed hob is arranged in the installation area. The toothed hob includes a strip-shaped hob shaft and a cylindrical hob tube. The two ends of the hob shaft are fixedly connected to the mounting bracket by bolts. The hob tube that rolls around the hob shaft is sleeved in the middle of the hob shaft. Multiple pointed grinding heads are embedded on the outer surface of the hob tube. The multiple grinding heads are evenly spaced on the hob tube.

[0010] The base plate is rotated horizontally, and the movement trajectory of the hob barrel forms a hob grinding trajectory ring, while the movement trajectory of the roller cone drill bit forms a roller cone grinding trajectory ring. The multiple hob grinding trajectory rings and the multiple roller cone grinding trajectory rings completely cover the lower end face.

[0011] 3) The bottom of the cylinder is welded and fixed to the upper end face, and the bottom plate is sealed on the bottom opening. The bottom plate is fixedly connected to the cylinder to form a hobbing drill bit.

[0012] Optionally, in step 2), the base plate is cut to form multiple pressure relief holes, which penetrate the base plate from top to bottom, and are arranged at intervals with the hobbing cutter bracket and the roller cone drill bit.

[0013] Optionally, the cylinder has a circumferential wall that encloses a cavity, the cavity having the bottom opening, and vertical or circumferential ribs welded to the outer surface of the cylinder wall.

[0014] Optionally, the bottom frame of the mounting bracket has two outwardly extending mounting heads, which are spaced apart to form a fixing area, and the end of the hob shaft passes through the fixing area to form a through section;

[0015] The through section is provided with a through hole, and the mounting head is provided with a mounting hole. The mounting hole and the through hole are aligned to form an anchoring channel. In step 2), a bolt is inserted into the anchoring channel to fix the through section and the mounting head together.

[0016] Optionally, in step 3), the roller cone bit is arranged at the center and both sides of the lower end face; the roller cone grinding trajectory ring covers the middle area and the outer peripheral area of ​​the lower end face, and the hob grinding trajectory ring covers the area between the middle area and the outer peripheral area.

[0017] Optionally, in step 3), a triangular steel frame is welded to the upper end face. The triangular steel frame includes a horizontally arranged horizontal section and a longitudinally arranged longitudinal section. The horizontal section is welded and fixed to the upper end face, and the longitudinal section is welded and fixed to the inner wall of the cylinder.

[0018] Optionally, eight triangular steel frames are provided. Before the longitudinal section is welded and fixed to the inner wall of the cylinder, the eight triangular steel frames are welded and fixed to the upper end face respectively, and the eight triangular steel frames are evenly spaced on the upper end face.

[0019] Optionally, the bottom of the cylinder has a bottom wall facing downwards; in step 3), before welding and fixing the bottom of the cylinder to the upper end face, an arc-shaped groove is cut on the upper end face according to the size of the bottom opening, the bottom wall is abutted against the bottom of the arc-shaped groove to form an arc-shaped butt joint section, and then the inner side and outer side are welded along the extension direction of the butt joint section to fix the bottom plate to the cylinder.

[0020] Optionally, the cutter barrel has an inner end near the center of the base plate and an outer end away from the center of the base plate, and the cross-section of the cutter barrel gradually narrows along the direction from the outer end to the inner end.

[0021] The hobbing cylinder has a central hole that passes through the central axis of the hobbing cylinder, and the middle part of the hobbing shaft passes through the central hole; the hobbing cylinder is provided with multiple arc-shaped tracks, which extend in an arc along the circumference of the hobbing cylinder, and the multiple arc-shaped tracks are arranged at intervals along the axial direction of the hobbing cylinder, and the arc-shaped tracks are arranged in a way that isolates them from the central axis;

[0022] The arc-shaped track is equipped with a counterweight that rolls along the arc-shaped track. When the roller cylinder moves along the roller grinding trajectory, the roller cylinder rotates clockwise around the roller shaft. When the counterweight moves to a set height, the counterweight moves downward along the arc-shaped track under the action of gravity and impacts the arc-shaped track from top to bottom.

[0023] Optionally, along the clockwise direction, the arc-shaped track includes a front end and a rear end, with a limiting spring connected to the rear end. The inner end of the limiting spring is connected to the rear end, and the outer end of the limiting spring extends toward the extension direction of the arc-shaped track.

[0024] When the roller cylinder starts to rotate from a stationary state, the counterweight impacts and presses against the limiting spring from top to bottom under the action of gravity, and the limiting spring deforms under the force; when the counterweight moves to a set height, the counterweight impacts the front end of the arc track from top to bottom under the action of elastic force and gravity; as the rotating cylinder continues to rotate, the counterweight returns from the front end to press against the limiting spring.

[0025] Compared with existing technologies, the present invention provides a method for manufacturing a rotary cutter bit suitable for the bottom rock surface trimming of large-diameter embedded rock pile holes. This method involves removing the bottom cutting teeth and roller cones from the rotary drilling rig's cylinder, and then welding a base plate equipped with toothed cutters and roller cones onto the bottom opening to form a rotary drilling cutter bit. This combines the rotary drilling rig cylinder with the toothed cutters. In actual construction, after the rotary drilling rig has finished excavating the hole, it can be replaced with the rotary drilling cutter bit without changing the drilling rig. The rotary drilling cutter bit is used to trim and smooth the entire cross-section of the uneven or stepped hole bottom, making the hole bottom flat. This greatly reduces the probability of excessive sediment thickness at the bottom of the hole, effectively improves the quality of the pile body, and significantly saves the direct costs of defective pile treatment, resulting in significant social and economic benefits. Attached Figure Description

[0026] Figure 1 This is a bottom view schematic diagram of the roller drill bit provided by the present invention, which is suitable for trimming the bottom rock surface of large-diameter rock-socketed pile holes;

[0027] Figure 2 This is a three-dimensional schematic diagram of the toothed hob provided by the present invention;

[0028] Figure 3 This is a three-dimensional schematic diagram of the hobbing cutter holder provided by the present invention;

[0029] Figure 4 This is a front view schematic diagram of the cylinder provided by the present invention;

[0030] Figure 5 This is a partial schematic diagram of the cylinder provided by the present invention;

[0031] Figure 6 This is a cross-sectional schematic diagram of the hobbing drill bit provided by the present invention;

[0032] Figure 7 This is a cross-sectional schematic diagram of the roller cylinder provided by the present invention. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0034] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0035] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] Reference Figure 1-7 This is a preferred embodiment of the present invention.

[0037] The present invention provides a method for manufacturing a roller drill bit suitable for trimming the bottom rock surface of large-diameter embedded rock pile holes, comprising the following steps:

[0038] 1) Provide a cylindrical rotary drilling barrel, and cut off the cutting teeth and rollers at the bottom of the rotary drilling barrel to form a barrel 100 with a bottom opening 101;

[0039] 2) A base plate 200 is provided, which includes a lower end face facing downward and an upper end face facing upward. Multiple roller brackets 300 and roller cone drill bits 400 are mounted on the lower end face. The multiple roller brackets 300 and roller cone drill bits 400 are spaced apart on the lower end face. The roller bracket 300 includes a base plate 300. The two ends of the base plate 300 have mounting brackets 301 extending downward. The two mounting brackets 301 are spaced apart to form a mounting area 302.

[0040] A toothed hob 310 is arranged in the installation area 302. The toothed hob 310 includes a strip-shaped hob shaft 311 and a cylindrical hob cylinder 312. The two ends of the hob shaft 311 are fixedly connected to the mounting bracket 301 by bolts 305. The hob cylinder 312, which rolls around the hob shaft, is sleeved in the middle of the hob shaft 311. Multiple pointed grinding heads 313 are embedded on the outer surface of the hob cylinder 312. The multiple grinding heads 313 are evenly spaced on the hob cylinder 312.

[0041] The horizontally rotating base plate 200 and the moving trajectory of the hob cylinder 312 form a hob grinding trajectory ring, and the moving trajectory of the roller cone drill bit 400 forms a roller cone grinding trajectory ring. Multiple hob grinding trajectory rings and multiple roller cone grinding trajectory rings completely cover the lower end face.

[0042] 3) Weld the bottom of the cylinder 100 to the upper end face, and cover the bottom opening 101 with the bottom plate 200. The bottom plate 200 is fixedly connected to the cylinder 100 to form a hobbing drill bit.

[0043] The above-mentioned method for manufacturing a rotary cutter bit suitable for finishing the bottom rock surface of large-diameter embedded rock pile holes involves removing the bottom cutting teeth and roller cones of the rotary drilling rig, and then welding a base plate 200 equipped with toothed cutters 310 and roller cone bits 400 onto the bottom opening 101 to form a rotary drilling cutter bit. This combines the rotary drilling rig with the toothed cutters 310. In actual construction, after the rotary drilling rig has finished drilling, it can be replaced with the rotary drilling cutter bit without changing the drilling rig. The rotary drilling cutter bit is used to finish and smooth the entire cross-section of the uneven or stepped bottom of the hole, making the bottom of the hole flat. This greatly reduces the probability of the bottom sediment thickness exceeding the standard, effectively improves the quality of the pile body, and significantly saves the direct cost of defective pile treatment, resulting in significant social and economic benefits.

[0044] Furthermore, the cutter barrel 312 rotates continuously around the rolling shaft, and the cutter barrel 312 is embedded with a pointed grinding head 313. Therefore, during the drilling process of the rotary cutter barrel, under the action of axial force, horizontal force and torque, the cutter barrel 312 and the grinding head 313 continuously grind, carve and gradually embed themselves into the rock, and squeeze and destroy the rock, which greatly improves the overall rock breaking drilling efficiency.

[0045] In step 2), the base plate 200 is cut to form multiple pressure relief holes 201. The pressure relief holes 201 penetrate the base plate 200 from top to bottom, and are arranged at intervals with the roller support 300 and the roller cone drill bit 400. In this way, the pressure relief holes 201 are used to reduce pressure during drilling and improve the overall rock breaking drilling efficiency.

[0046] The cylinder 100 has a circumferential wall that encloses a cavity, which has a bottom opening 101. Vertical or circumferential ribs 110 are welded to the outer surface of the cylinder wall. This improves the overall strength of the cylinder 100.

[0047] The bottom frame of the mounting bracket 301 has two outwardly extending mounting heads 303, which are spaced apart to form a fixing area 304. The end of the hob shaft 311 passes through the fixing area 304 to form a through section.

[0048] The through section has a through hole, and the mounting head 303 has a mounting hole. The mounting hole and the through hole are aligned to form an anchoring channel. In step 2), bolts 305 are inserted into the anchoring channel to fix the through section to the mounting head 303. In this way, by using the roller bracket 300 to fix both ends of the cutter shaft 311, and by using the rolling cylinder sleeved in the middle of the cutter shaft 311 to grind the rock strata at the bottom of the hole during the drilling process of the rotary cutter drill bit, it is possible to achieve the goal of changing the drill bit without changing the drill rig, thereby improving work efficiency.

[0049] In step 3), the roller cone drill bit 400 is positioned at the center and both sides of the lower end face; the roller cone grinding trajectory ring covers the central and outer peripheral areas of the lower end face, and the hob grinding trajectory ring covers the area between the central and outer peripheral areas. This achieves full coverage of the lower end face. Since the toothed hob 310 is mounted on the lower end face using a mounting bracket, some grinding surfaces are missing. Therefore, the roller cone drill bit 400 is used to supplement these gaps, ensuring full coverage of the grinding trajectory.

[0050] In step 3), a triangular steel frame 500 is welded to the upper end face. The triangular steel frame 500 includes a horizontally arranged horizontal section 501 and a longitudinally arranged longitudinal section 502. The horizontal section 501 is welded and fixed to the upper end face, and the longitudinal section 502 is welded and fixed to the inner wall of the cylinder 100. In this way, by using the triangular steel frame 500 as a connector, the connection between the bottom plate 200 and the cylinder 100 is strengthened, ensuring the stability of the connection.

[0051] Eight triangular steel frames 500 are provided. Before the longitudinal section 502 is welded and fixed to the inner wall of the cylinder 100, the eight triangular steel frames 500 are welded and fixed to the upper end face respectively, with the eight triangular steel frames 500 evenly spaced on the upper end face. In this way, the eight triangular steel frames 500 play a stabilizing and reinforcing role, ensuring the overall connection strength between the bottom plate 200 and the cylinder 100.

[0052] In this embodiment, the bottom of the cylinder 100 has a bottom wall facing downwards. In step 3), before welding and fixing the bottom of the cylinder 100 to the upper end face, an arc-shaped groove 102 is cut on the upper end face according to the size of the bottom opening 101. The bottom wall is then placed against the bottom of the arc-shaped groove 102 to form an arc-shaped butt joint. Inner and outer welding are then performed along the extension direction of the butt joint to fix the bottom plate 200 to the cylinder 100. In this way, the arc-shaped groove 102 serves as a positioning and butt joint, while also facilitating the welding between the cylinder 100 and the bottom plate 200. The welding employs double welding, i.e., one ring welded on the outer edge and one ring welded on the inner side wall of the cylinder cavity, which improves the welding strength and ensures the connection strength between the cylinder 100 and the bottom plate 200.

[0053] In this embodiment, the hobbing barrel 312 has an inner end 3101 near the center of the base plate 200 and an outer end 3100 away from the center of the base plate 200. Along the direction from the outer end 3100 toward the inner end 3101, the cross-section of the hobbing barrel 312 gradually narrows.

[0054] The hobbing cylinder 312 has a central hole through which the central axis of the hobbing cylinder 312 passes, and the middle part of the hobbing shaft 311 passes through the central hole; the hobbing cylinder 312 is provided with multiple arc-shaped tracks 320, which extend in an arc along the circumference of the hobbing cylinder 312, and the multiple arc-shaped tracks 320 are arranged at intervals along the axial direction of the hobbing cylinder 312, and the arc-shaped tracks 320 are arranged in a separated manner from the central axis;

[0055] The arc-shaped track 320 is equipped with a counterweight 321 that rolls along the arc-shaped track 320. When the hob cylinder 312 moves along the hob grinding track ring, the hob cylinder 312 rotates clockwise around the hob shaft 311. When the counterweight 321 moves to the set height, the counterweight 321 moves downward along the arc-shaped track 320 under the action of gravity and impacts the arc-shaped track 320 from top to bottom.

[0056] The hob cylinder 312 can roll along the center of the hob shaft 311, and the arc track 320 provided inside the hob cylinder 312 will cause the counterweight 321 to move to a set height. Under the action of gravity, the counterweight 321 will hit the arc track 320, driving the hob cylinder 312 to grind the bottom of the hole downward.

[0057] In this embodiment, along the clockwise direction, the arc-shaped track 320 includes a front end and a rear end. A limiting spring 322 is connected to the rear end. The inner end of the limiting spring 322 is connected to the rear end, and the outer end of the limiting spring 322 extends toward the extension direction of the arc-shaped track 320.

[0058] When the roller drum 312 starts to rotate from a stationary state, the counterweight 321, under the action of gravity, impacts and presses against the limiting spring 322 from top to bottom, causing the limiting spring 322 to deform under force. When the counterweight 321 moves to a set height, under the action of elastic force and gravity, it impacts the front end of the arc track 320 from top to bottom. As the rotating drum continues to rotate, the counterweight 321 returns to its original position from the front end, pressing against the limiting spring 322. The limiting spring 322 prevents the counterweight 321 from directly impacting the rear end. When the counterweight 321 moves to the set height, it impacts the rear end under the action of the elastic force of the limiting spring 322 and its own weight, driving the roller drum 312 to grind the bottom of the hole downwards.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for manufacturing a rotary drill bit suitable for trimming the bottom rock surface of large-diameter embedded rock pile holes, characterized in that, Includes the following steps: 1) Provide a cylindrical rotary drilling barrel, and cut off the cutting teeth and rollers at the bottom of the rotary drilling barrel to form a barrel with a bottom opening; 2) A base plate is provided, the base plate having a lower end face facing downward and an upper end face facing upward. Multiple hob supports and roller cone drill bits are mounted on the lower end face, and the multiple hob supports and roller cone drill bits are arranged at intervals on the lower end face. The hob support includes a base plate, and the two ends of the base plate have mounting brackets extending downward, and the two mounting brackets are arranged at intervals to form a mounting area. Toothed hobs are arranged in the installation area. The toothed hob includes a strip-shaped hob shaft and a cylindrical hob tube. The two ends of the hob shaft are fixedly connected to the mounting bracket by bolts. The hob tube that rolls around the hob shaft is sleeved in the middle of the hob shaft. Multiple pointed grinding heads are embedded on the outer surface of the hob tube. The multiple grinding heads are evenly spaced on the hob tube. The base plate is rotated horizontally, and the movement trajectory of the hob barrel forms a hob grinding trajectory ring, and the movement trajectory of the roller cone drill bit forms a roller cone grinding trajectory ring. Multiple hob grinding trajectory rings and multiple roller cone grinding trajectory rings completely cover the lower end face. 3) The bottom of the cylinder is welded and fixed to the upper end face, the bottom plate is sealed on the bottom opening, and the bottom plate is fixedly connected to the cylinder to form a hobbing drill bit; The roller cutter cylinder has an inner end near the center of the base plate and an outer end away from the center of the base plate. Along the direction from the outer end to the inner end, the cross-section of the roller cutter cylinder gradually narrows. The hobbing cylinder has a central hole that passes through the central axis of the hobbing cylinder, and the middle part of the hobbing shaft passes through the central hole; the hobbing cylinder is provided with multiple arc-shaped tracks, which extend in an arc along the circumference of the hobbing cylinder, and the multiple arc-shaped tracks are arranged at intervals along the axial direction of the hobbing cylinder, and the arc-shaped tracks are arranged in a way that isolates them from the central axis; The arc-shaped track is equipped with a counterweight that rolls along the arc-shaped track. When the roller cylinder moves along the roller grinding trajectory, the roller cylinder rotates clockwise around the roller shaft. When the counterweight moves to a set height, the counterweight moves downward along the arc-shaped track under the action of gravity and impacts the arc-shaped track from top to bottom. Along the clockwise direction, the arc-shaped track includes a front end and a rear end. A limiting spring is connected to the rear end. The inner end of the limiting spring is connected to the rear end, and the outer end of the limiting spring extends toward the extension direction of the arc-shaped track. When the roller cylinder starts to rotate from a stationary state, the counterweight impacts and presses against the limiting spring from top to bottom under the action of gravity, and the limiting spring deforms under the force; when the counterweight moves to a set height, the counterweight impacts the front end of the arc track from top to bottom under the action of elastic force and gravity; as the rotating cylinder continues to rotate, the counterweight returns from the front end to press against the limiting spring.

2. The method for manufacturing a rotary drill bit suitable for trimming the bottom rock surface of large-diameter embedded rock pile holes as described in claim 1, characterized in that, In step 2), the base plate is cut to form multiple pressure relief holes. The pressure relief holes penetrate the base plate from top to bottom and are arranged at intervals with the hobbing cutter bracket and the roller cone drill bit.

3. The method for manufacturing a rotary drill bit suitable for trimming the bottom rock surface of large-diameter embedded rock pile holes as described in claim 1, characterized in that, The cylinder has a circumferential wall that encloses a cavity, which has a bottom opening. Vertical or circumferential ribs are welded to the outer surface of the cylinder wall.

4. The method for manufacturing a rotary drill bit suitable for trimming the bottom rock surface of large-diameter embedded rock pile holes as described in claim 1, characterized in that, The bottom of the mounting bracket has two outwardly extending mounting heads, and the two mounting heads are arranged at intervals to form a fixed area. The end of the hob shaft passes through the fixed area to form a through section. The through section is provided with a through hole, and the mounting head is provided with a mounting hole. The mounting hole and the through hole are aligned to form an anchoring channel. In step 2), a bolt is inserted into the anchoring channel to fix the through section and the mounting head together.

5. The method for manufacturing a rotary drill bit suitable for trimming the bottom rock surface of large-diameter embedded rock pile holes as described in claim 1, characterized in that, In step 3), the roller cone bit is arranged at the center and both sides of the lower end face; the roller cone grinding trajectory ring covers the middle area and the outer peripheral area of ​​the lower end face, and the hob grinding trajectory ring covers the area between the middle area and the outer peripheral area.

6. The method for manufacturing a rotary drill bit suitable for trimming the bottom rock surface of large-diameter embedded rock pile holes as described in claim 1, characterized in that, In step 3), a triangular steel frame is welded to the upper end face. The triangular steel frame includes a horizontally arranged horizontal section and a longitudinally arranged longitudinal section. The horizontal section is welded and fixed to the upper end face, and the longitudinal section is welded and fixed to the inner wall of the cylinder.

7. The method for manufacturing a rotary cutter bit suitable for trimming the bottom rock surface of large-diameter embedded rock pile holes as described in claim 6, characterized in that, Eight triangular steel frames are provided. Before the longitudinal section is welded and fixed to the inner wall of the cylinder, the eight triangular steel frames are welded and fixed to the upper end face respectively. The eight triangular steel frames are evenly spaced on the upper end face.

8. The method for manufacturing a rotary drill bit suitable for trimming the bottom rock surface of large-diameter embedded rock pile holes as described in claim 7, characterized in that, The bottom of the cylinder has a bottom wall facing downwards; in step 3), before welding and fixing the bottom of the cylinder to the upper end face, an arc-shaped groove is cut on the upper end face according to the size of the bottom opening, the bottom wall is abutted against the bottom of the arc-shaped groove to form an arc-shaped butt joint section, and then the inner side and outer side are welded along the extension direction of the butt joint section to fix the bottom plate to the cylinder.

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