A rotary drilling rig

Abstract

This utility model belongs to the field of pile foundation construction technology, specifically providing a rotary drilling rig, including a drilling rig body and a detachable directional drilling tool mounted on the drilling rig body. The top of the drilling rig body has an installation hole, and the top of the directional drilling tool is detachably connected to the installation hole via a connecting plate and a connecting column. When the borehole encounters strata prone to deviation, such as sloping rock or pebbles, the directional drilling tool can be mounted on the drilling rig body. Because the drill bit of the directional drilling tool is lower than the cutting teeth of the drilling rig body, during downward drilling, a smaller diameter directional borehole is first drilled by the drill bit, guiding the drilling rig body downwards. During the downward drilling process of the drilling rig body, the directional drilling tool plays a guiding, stabilizing, and deflection-reducing role, thus improving the verticality of the borehole and preventing excessive axial deviation of the borehole. The directional drilling tool is detachable; it can be removed after the borehole passes through hard strata without affecting the drilling efficiency of the rotary drilling rig.

Description

Technical Field

[0001] This application belongs to the field of pile foundation construction technology, and more specifically, relates to a rotary drilling rig. Background Technology

[0002] Rotary drilling is a construction technique suitable for hole-forming operations in building foundation engineering. It is widely used in pile foundation construction of municipal construction, highway bridges, high-rise buildings, and other structures. A barrel drill is a type of rotary drilling rig. The barrel drill is cylindrical in shape with a ring of cutting teeth at the bottom. During operation, the drill rod of the rotary drilling rig drives the barrel drill downwards, and the cutting teeth break up soil and rock to propel the barrel drill downwards.

[0003] Pipe drills are suitable for relatively soft rock formations such as artificial fill and bedrock, and are characterized by their simple structure and high construction efficiency. However, existing pipe drill technologies also have shortcomings. When facing geological formations with uneven structures, pebbles, or inclined rocks, existing pipe drills tend to move towards the softer side, causing borehole deviation and resulting in poor verticality of the final hole. This deviation is particularly pronounced when using large-diameter pipe drills for rotary drilling. Utility Model Content

[0004] Based on the above-mentioned technical problems, this application provides a rotary drilling rig to solve the technical problem that existing rigs are prone to deviation when drilling into strata with uneven geological structures.

[0005] To achieve the above objectives, the technical solution adopted in this application is: to provide a rotary drilling rig, comprising:

[0006] The drill bit body is cylindrical. The top of the drill bit body has a connector for connecting to a drill rod. The bottom of the drill bit body has multiple cutting teeth spaced apart along its circumference. The top of the drill bit body has a mounting hole communicating with its inner cavity, located on the outer periphery of the connector.

[0007] A directional drilling tool is detachably mounted on the barrel drill body. The directional drilling tool includes a connecting plate, a connecting rod, and a drill bit. The connecting rod is vertically mounted on the lower surface of the connecting plate. The drill bit is located at the bottom of the connecting rod and is lower than the lower surface of the barrel drill body. The connecting plate is housed in the inner cavity of the barrel drill body. A connecting post is provided on the upper surface of the connecting plate. The connecting post is detachably mounted through the mounting hole.

[0008] In one possible implementation, the cutting teeth can be divided into internal teeth, middle teeth, and external teeth according to their orientation. The internal teeth, middle teeth, and external teeth are alternately arranged along the circumferential direction of the drill body. The sharp ends of the internal teeth, middle teeth, and external teeth are all inclined along the rotation direction of the drill body, and the sharp ends of the internal teeth are biased towards the inner side of the drill body, while the sharp ends of the external teeth are biased towards the outer side of the drill body.

[0009] In one possible implementation, the outer peripheral wall of the drill body is provided with a guide bar that extends in a helical direction.

[0010] In one possible implementation, the top of the drill bit body is provided with a plurality of mounting holes spaced apart along the circumferential direction, and the connecting plate has a plurality of connecting posts corresponding one-to-one with the mounting holes.

[0011] In one possible implementation, the upper end of the connecting post passes through the mounting hole and a nut is threaded onto the top of the drill bit body.

[0012] In one possible implementation, the rotary drilling rig further includes two guide plates, which are semi-circular in shape. When the two guide plates are joined together, they form a cylindrical guide tube. The outer diameter of the guide tube is the same as the outer diameter of the drilling rig body. The guide plates are detachably mounted on the top of the drilling rig body.

[0013] In one possible implementation, the connector is a square head with multiple ribs spaced circumferentially. The inner side of each rib is connected to the square head, and the outer side of each rib forms a vertical positioning surface for fitting against the inner side of the guide plate. The positioning surface has a positioning hole, which is a threaded hole. The guide plate has a connecting hole that penetrates its own wall thickness. The connecting hole corresponds one-to-one with the positioning hole. The connecting hole is a countersunk hole, and the connecting hole and the positioning hole are detachably connected by bolts.

[0014] In one possible implementation, one of the guide plates has a positioning protrusion on its mating surface, and the other guide plate has a positioning groove on its mating surface that is adapted to the positioning protrusion.

[0015] In one possible implementation, the axial height of the guide plate is higher than that of the connector.

[0016] In one possible implementation, the drill bit is one of a tubular drill, a PDC drill, and a roller cone drill, and the borehole diameter of the drill bit is smaller than that of the tubular drill body.

[0017] Compared with the prior art, the advantages of the rotary drilling rig provided in this application are:

[0018] This application provides a rotary drilling rig including a drilling rig body and a detachable directional drilling tool mounted on the drilling rig body. The top of the drilling rig body has a mounting hole, and the top of the directional drilling tool is detachably connected to the mounting hole via a connecting plate and a connecting column. When the borehole encounters strata prone to deviation, such as inclined rock or pebbles, the directional drilling tool can be mounted onto the drilling rig body. Because the drill bit of the directional drilling tool is lower than the cutting teeth of the drilling rig body, during downward drilling, a smaller diameter directional borehole is first drilled by the drill bit, guiding the drilling rig body downwards. During the downward drilling process of the drilling rig body, the directional drilling tool plays a guiding, stabilizing, and deflection-reducing role, thus improving the verticality of the borehole and preventing excessive deviation of the borehole axis. The directional drilling tool is detachable; after the borehole passes through hard strata, the directional drilling tool can be removed without affecting the subsequent drilling efficiency of the rotary drilling rig. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 An exploded assembly view of Embodiment 1 of the rotary drilling rig provided in this application;

[0021] Figure 2 A perspective view of the first embodiment of the rotary drilling rig provided in this application;

[0022] Figure 3 This is an exploded assembly view of Embodiment 2 of the rotary drilling rig provided in this application;

[0023] Figure 4 A perspective view of Embodiment 2 of the rotary drilling rig provided in this application;

[0024] Figure 5 A perspective view of Embodiment 3 of the rotary drilling rig provided in this application;

[0025] Figure 6 A diagram showing the distribution of cutting teeth for a rotary drilling rig provided in this application;

[0026] Figure 7 The diagram provided in this application illustrates the construction of a rotary drilling rig when encountering inclined rock formations. Figure 1 ;

[0027] Figure 8 The diagram provided in this application illustrates the construction of a rotary drilling rig when encountering inclined rock formations. Figure 2 ;

[0028] Figure 9The diagram provided in this application illustrates the construction of a rotary drilling rig when encountering inclined rock formations. Figure 3 ;

[0029] Explanation of reference numerals in the attached figures:

[0030] 10. Drill body; 11. Connector; 111. Square head; 112. Rib; 113. Positioning hole; 12. Mounting hole; 13. Internal tooth; 14. Middle tooth; 15. External tooth; 16. Guide bar; 20. Directional drilling tool; 21. Connecting plate; 211. Connecting column; 212. Nut; 22. Connecting rod; 23. Drill bit; 30. Guide plate; 31. Connecting hole; 40. Bolt. Detailed Implementation

[0031] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0032] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0033] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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, they should not be construed as limitations on this application.

[0034] Furthermore, the terms "first" and "second" 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" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" or "several" means two or more, unless otherwise explicitly specified.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0036] Please refer to the following: Figures 1 to 9 The rotary drilling rig provided in this application will now be described.

[0037] Please see Figure 1 and Figure 2 As an embodiment of this application, a rotary drilling rig includes a rig body 10 and a directional drilling tool 20. The rig body 10 is cylindrical, and the top of the rig body 10 has a connector 11 for connecting to a drill rod. The bottom of the rig body 10 has a plurality of cutting teeth spaced apart along its circumference. The top of the rig body 10 has a mounting hole 12 that communicates with its own inner cavity. The mounting hole 12 is located on the outer periphery of the connector 11. The directional drilling tool 20 is detachably disposed on the rig body 10. The directional drilling tool 20 includes a connecting plate 21, a connecting rod 22, and a drill bit 23. The connecting rod 22 is vertically disposed on the lower surface of the connecting plate 21. The drill bit 23 is disposed at the bottom of the connecting rod 22 and is lower than the lower surface of the rig body 10. The connecting plate 21 is housed in the inner cavity of the rig body 10. The upper surface of the connecting plate 21 has a connecting post 211, which is detachably inserted through the mounting hole 12.

[0038] Compared with the prior art, the advantages of the rotary drilling rig provided in this application are:

[0039] This application provides a rotary drilling rig including a drill body 10 and a directional drilling tool 20 detachably mounted on the drill body 10. The top of the drill body 10 has a mounting hole 12. The top of the directional drilling tool 20 is detachably connected to the mounting hole 12 via a connecting plate 21 and a connecting post 211. When the borehole encounters strata prone to displacement, such as inclined rock or pebbles, the directional drilling tool 20 can be mounted onto the drill body 10. Because the drill bit 23 of the directional drilling tool 20 is lower than the cutting teeth of the drill body 10, during downward drilling, a smaller diameter directional borehole is first drilled by the drill bit 23, which then guides the drill body 10 downward. During the downward drilling process of the drill body, the directional drilling tool 20 serves to guide, stabilize the drill rod, and reduce displacement, thereby improving the verticality of the borehole and preventing excessive axial displacement of the borehole. The directional drilling tool 20 is detachably installed. After the borehole passes through a hard stratum, the directional drilling tool 20 can be removed without affecting the drilling efficiency of the subsequent rotary drilling rig.

[0040] The drill bit body 10 can be a cutting tooth drill bit from the prior art, and the diameter of the drill bit body 10 corresponds to the diameter of the pile to be constructed. The top of the drill bit body 10 has a connector 11 that connects to the drill rod of the rotary drilling rig, and multiple mounting holes 12 are formed around the connector 11. The mounting holes 12 are used for connection and fixation with the connecting column 211. The shape of the mounting holes 12 can be circular, triangular, square, etc.

[0041] The directional drilling tool 20 consists of a connecting plate 21, a connecting rod 22, and a drill bit 23. The directional drilling tool 20 is coaxially arranged with the tubular drill body 10. When the directional drilling tool 20 and the tubular drill body 10 are connected as one unit, the drill rod can simultaneously drive the directional drilling tool 20 and the tubular drill body 10 to rotate.

[0042] The connecting plate 21, connecting rod 22, and drill bit 23 can be fixedly connected as a whole by welding or other methods. The shape of the connecting plate 21 can be circular, square, or other shapes. The upper surface of the connecting plate 21 has a connecting post 211, which is used to extend upward into the mounting hole 12.

[0043] like Figures 7 to 9 When encountering inclined rock or pebble strata, the drill bit body 10 is first used to drill to the depth of contact with the inclined rock. Then, the drill bit body 10 is raised to the surface, and the upper end of the directional drilling tool 20 is inserted into the inner cavity of the drill bit body 10, so that the connecting post 211 is inserted into the corresponding mounting hole 12 and fixed with fasteners such as pins and screws. Since the mounting hole 12 is located on the outer periphery of the connecting head 11, the connecting head 11 and drill rod do not need to be disassembled when installing and disassembling the directional drilling tool 20.

[0044] After the directional drilling tool 20 is installed, the rotary drilling rig controls the rotary drum drill to continue drilling downwards. First, the directional drilling tool 20 drills a small hole in the inclined rock. Due to the small diameter of the directional drilling tool 20, it is more stable during rock breaking and less prone to deviation. The drum drill body 10 drills downwards along with the directional drilling tool 20. During drilling, the directional drilling tool 20 guides and stabilizes the drill rod, reducing drill rod sway and improving the verticality of the borehole. After drilling out of the inclined rock strata, the directional drilling tool 20 is removed, and drilling can continue using the drum drill body 10.

[0045] Please see Figure 6 The cutting teeth, according to their orientation, can be specifically divided into inner teeth 13, middle teeth 14, and outer teeth 15. These teeth are alternately arranged along the circumference of the drill bit body 10. The sharp ends of all three teeth are inclined along the rotation direction of the drill bit body 10, with the sharp end of the inner teeth 13 biased towards the inner side of the drill bit body 10 and the sharp end of the outer teeth 15 biased towards the outer side. This different orientation of the cutting teeth helps prevent uneven wear, improves the stability of the drill bit body 10 during drilling in complex strata, and reduces pile diameter deviation.

[0046] The cutting teeth come into direct contact with the formation during drilling. They should be made of wear-resistant materials to reduce the frequency of replacement and shorten the construction cycle, thereby saving a lot of material and time costs.

[0047] Please see Figures 1 to 5The outer peripheral wall of the drill barrel body 10 is provided with guide strips 16, which extend in a spiral direction. The guide strips 16 are welded onto the outer surface of the drill barrel body 10 and are also called protective strips or wear-resistant strips. The guide strips 16 have two main functions: first, to protect the barrel body and prevent wear; and second, and more importantly, to guide drill cuttings, guiding and transporting their movement to reduce drilling resistance. The guide strips 16 cannot be welded arbitrarily; their position and angle must be carefully considered, and they should be designed in a spiral shape to maximize their guiding effect on the drill cuttings.

[0048] The connector 11, the cutting tooth, and the guide bar 16 are all common structures in existing barrel drilling tools. There are no specific restrictions on parameters such as the shape and size of the connector 11, the helix angle and pitch of the guide bar 16, and the inclination angle of the cutting tooth. Users can choose and set these parameters according to their actual needs.

[0049] Please see Figure 1 and Figure 3 The top of the drill body 10 is provided with a plurality of mounting holes 12 spaced apart along the circumferential direction. The connecting plate 21 has a plurality of connecting posts 211 corresponding to the mounting holes 12 one by one. The plurality of connecting posts 211 can improve the stability of the connection.

[0050] Please see Figure 1 and Figure 3 The upper end of the connecting column 211 has external threads. The upper end of the connecting column 211 passes through the mounting hole 12 and is threaded with a nut 212 on the top of the drill body 10. The nut 212 is used for fixing, which facilitates installation and disassembly. To prevent the nut 212 from loosening under impact loads, it can be fixed by installing a loosening washer or by spot welding. When spot welding is used, the weld points need to be removed with tools when the directional drilling tool 20 needs to be removed. The disadvantage is that the workload is large, but the advantage is that the connection is firm and reliable.

[0051] Please see Figures 1 to 5 The rotary drilling rig also includes two guide plates 30, which are semi-circular arc-shaped. When the two guide plates 30 are joined together, they form a cylindrical guide tube. The outer diameter of the guide tube is the same as the outer diameter of the drill body 10. The guide plates 30 are detachably mounted on the top of the drill body 10.

[0052] The outer wall of the guide tube can also be provided with guide bars 16, and the guide bars 16 acting on the outer wall of the drill body 10 are the same.

[0053] The guide plate 30 serves to extend the axial length of the drill body 10. The two guide plates 30 are joined together to form a guide cylinder. During the downward drilling process of the drill body 10, the guide cylinder and the inner wall of the borehole are in close contact and guided, which can reduce the sway of the drill rod and provide auxiliary guidance for the drill body 10, thereby improving the stability of the drill hole and reducing the deviation of the borehole axis.

[0054] The guide plate 30 at the top of the barrel drill body 10 and the drill bit 23 at the bottom work together to achieve a higher degree of verticality in the drilled hole. The guide plate 30 is detachably connected to the barrel drill body 10 and can be installed or removed as needed.

[0055] Please see Figure 1 and Figure 3 The connector 11 is a square head 111, and has multiple ribs 112 spaced apart along its circumference. The inner side of the ribs 112 is connected to the square head 111, and the outer side of the ribs 112 forms a vertical positioning surface. The positioning surface is used to fit against the inner side of the guide plate 30. The positioning surface has a positioning hole 113, which is a threaded hole. The guide plate 30 has a connecting hole 31 that penetrates its own wall thickness. The connecting hole 31 corresponds one-to-one with the positioning hole 113. The connecting hole 31 is a countersunk hole. The connecting hole 31 and the positioning hole 113 are detachably connected by bolts 40.

[0056] Rib 112 is used to support and fix guide plate 30. The nut of bolt 40 is located in countersunk hole. The threaded end of bolt 40 passes through connection hole 31 and is threaded to positioning hole 113.

[0057] To facilitate the positioning of the two guide plates 30 during installation, one guide plate 30 has a positioning protrusion on its mating surface, and the other guide plate 30 has a positioning groove on its mating surface. The cross-sectional shape of the positioning protrusion can be square, round, triangular, etc., and the shape of the positioning groove is adapted to the positioning protrusion.

[0058] Please see Figure 1 , Figure 4 and Figure 5 The axial height of the guide plate 30 is higher than that of the connector 11. The higher the guide plate 30, the better the positioning and guiding effect during drilling, and the less likely the drill bit will deviate. However, a higher guide plate 30 will also cause the drill bit to become heavier and make installation more inconvenient. Users can choose to set the specific height of the guide plate 30 according to their own needs, and no specific restrictions are imposed here.

[0059] Please see Figure 2 , Figure 4 and Figure 5 Drill bit 23 is one of a barrel drill, a PDC drill, or a roller cone drill. The drilling diameter of drill bit 23 is smaller than that of the barrel drill body 10, specifically 40-60% of the diameter of the barrel drill body 10. Smaller diameter drill bit 23 has stronger rock-breaking ability and is less prone to deviation during drilling, resulting in higher drill hole verticality. Barrel drills, PDC drills, and roller cone drills are all existing drilling tools, and their specific shapes and structures will not be described in detail. The only difference between Embodiments 1, 2, and 3 of this application is the type of drill bit 23; all other structures and usage methods are the same.

[0060] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present utility model specification has recorded each combined embodiment and can support different combined embodiments.

[0061] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotary drilling rig, characterized in that, include: The drill body (10) is cylindrical. The top of the drill body (10) has a connector (11) for connecting to the drill rod. The bottom of the drill body (10) has multiple cutting teeth spaced apart along its circumference. The top of the drill body (10) has a mounting hole (12) that communicates with its inner cavity. The mounting hole (12) is located on the outer periphery of the connector (11). A directional drilling tool (20) is detachably mounted on the barrel drill body (10). The directional drilling tool (20) includes a connecting plate (21), a connecting rod (22), and a drill bit (23). The connecting rod (22) is vertically mounted on the lower surface of the connecting plate (21). The drill bit (23) is located at the bottom of the connecting rod (22) and is lower than the lower surface of the barrel drill body (10). The connecting plate (21) is housed in the inner cavity of the barrel drill body (10). A connecting post (211) is provided on the upper surface of the connecting plate (21). The connecting post (211) is detachably mounted through the mounting hole (12).

2. The rotary drilling rig according to claim 1, characterized in that, The cutting teeth include internal teeth (13), middle teeth (14) and external teeth (15). The internal teeth (13), middle teeth (14) and external teeth (15) are alternately arranged along the circumferential direction of the drill body (10). The sharp ends of the internal teeth (13), middle teeth (14) and external teeth (15) are all inclined along the rotation direction of the drill body (10). The sharp end of the internal teeth (13) is biased towards the inner side of the drill body (10), and the sharp end of the external teeth (15) is biased towards the outer side of the drill body (10).

3. A rotary drilling rig according to claim 1, characterized in that, The outer peripheral wall of the drill body (10) is provided with a guide strip (16), which extends in a spiral direction.

4. A rotary drilling rig according to claim 1, characterized in that, The top of the drill body (10) is provided with a plurality of mounting holes (12) spaced apart along the circumferential direction, and the connecting plate (21) has a plurality of connecting posts (211) corresponding one-to-one with the mounting holes (12).

5. A rotary drilling rig according to claim 1 or 4, characterized in that, The upper end of the connecting column (211) passes through the mounting hole (12) and a nut (212) is threaded onto the top of the drill body (10).

6. A rotary drilling rig according to claim 1, characterized in that, The rotary drilling rig also includes two guide plates (30), which are semi-circular arc-shaped. The two guide plates (30) are joined together to form a cylindrical guide tube. The outer diameter of the guide tube is the same as the outer diameter of the drilling rig body (10). The guide plates (30) are detachably disposed on the top of the drilling rig body (10).

7. A rotary drilling rig according to claim 6, characterized in that, The connector (11) is a square head (111) and has multiple ribs (112) spaced apart along its circumference. The inner side of the ribs (112) is connected to the square head (111), and the outer side of the ribs (112) forms a vertical positioning surface. The positioning surface is used to fit against the inner side of the guide plate (30). The positioning surface has a positioning hole (113), which is a threaded hole. The guide plate (30) has a connecting hole (31) that penetrates its own wall thickness. The connecting hole (31) corresponds one-to-one with the positioning hole (113). The connecting hole (31) is a countersunk hole. The connecting hole (31) and the positioning hole (113) are detachably connected by bolts (40).

8. A rotary drilling rig according to claim 6, characterized in that, One of the guide plates (30) has a positioning protrusion on its mating surface, and the other guide plate (30) has a positioning groove on its mating surface that is adapted to the positioning protrusion.

9. A rotary drilling rig according to claim 6, characterized in that, The axial height of the guide plate (30) is higher than that of the connector (11).

10. A rotary drilling rig according to claim 1, characterized in that, The drill bit (23) is one of a tubular drill, a PDC drill, and a roller cone drill, and the drilling diameter of the drill bit (23) is smaller than that of the tubular drill body (10).

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