Cone hob bit assembly for hard formations

Abstract

The utility model discloses a cone hob bit assembly part for a hard stratum. Comprising a drill bit connecting device connected with a drill rod guide pipe of a drilling machine, a guide diameter wheel device used for increasing the weight of a cone hob drill bit assembly part and controlling the diameter and perpendicularity of a cast-in-place pile hole, a balance weight device used for increasing the weight of the cone hob drill bit assembly part, and a cone hob drill bit device used for grinding and drilling. And the slurry guide pipe is used for sucking and discharging slag slurry generated in the drilling process out of the pile hole. The drill bit connecting device, the guide radial wheel device, the counterweight device and the cone hob drill bit device are sequentially arranged in the axial direction and are detachably fixed. The slurry guide pipe sequentially penetrates and is connected with the four devices in the axial direction, the top end of the slurry guide pipe is communicated with the drill rod guide pipe, and the bottom end of the slurry guide pipe extends out of the cone hob drill bit device. According to the cone hob drill bit assembly part for the hard stratum, the stability and the cutting capacity of a cone hob drill bit device are improved, and the situation that the drill bit is stuck and buried when the drill bit drills in the hard stratum is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge pile foundation construction, in particular to a roller cutter drill bit assembly for hard strata. Background Art

[0002] As a common pile foundation, the inclination of bored piles refers to the degree of deviation of bored piles in the vertical direction, which is crucial to the stability of building structures. The current national standards and specifications stipulate that the inclination deviation of bored piles shall not exceed 1% of the pile length and shall be ≤500mm. If the inclination deviation of bored piles is too large, it will lead to the instability of the entire building structure, thus affecting the service life and safety of the building.

[0003] For 30 cast-in-place piles of the main pier of an A-shaped single-tower cable-stayed bridge in a bridge project located in the Guangdong Delta Plain, which is located in a strong earthquake zone with a seismic fortification intensity of 8 degrees (0.20g), affected by strong typhoons from June to October, with high-strength and strongly developed boulders or boulder groups buried at a depth of more than 110m, and river-sea alluvial strata with strongly weathered granite inclined bedrock, the bored piles were bored at a depth of more than 135m, and the rate of encountering boulders or boulder groups during drilling reached 41%.

[0004] In the prior art, a single roller cutter is generally used in conjunction with a drilling rig to grind and drill a single rock or a group of rocks. Since the roller cutter is light in weight, it is easy to swing and become unstable during grinding and drilling, which in turn affects the diameter and verticality of the bored pile hole, causing the bored pile to deviate in the vertical direction. The swinging of the roller cutter can also easily cause the drill bit to get stuck or buried, resulting in low bored pile drilling efficiency. Utility Model Content

[0005] The utility model provides a roller cutter drill bit assembly for hard formations to solve the technical problems that the existing single roller cutter is prone to swing and instability during grinding drilling, which in turn affects the diameter and verticality of the bored pile hole, causing the bored pile to deviate in the vertical direction, and the swinging is also prone to cause the drill bit to get stuck and buried, thereby resulting in low bored pile drilling efficiency.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A roller cutter drill bit assembly for hard formations comprises: a drill bit connection device for connecting to a drill pipe conduit of a drilling rig, a guide wheel device for increasing the weight of the roller cutter drill bit assembly and controlling the diameter and verticality of a bored pile hole, a counterweight device for increasing the weight of the roller cutter drill bit assembly, a roller cutter drill bit device for grinding drilling, and a mud conduit for sucking and discharging slurry generated during the drilling process out of the pile hole; the drill bit connection device, the guide wheel device, the counterweight device and the roller cutter drill bit device are sequentially arranged along the axial direction and are detachably fixed; the mud conduit is sequentially penetrated and connected to the drill bit connection device, the guide wheel device, the counterweight device and the roller cutter drill bit device along the axial direction, and the top end of the mud conduit is also connected to the drill pipe conduit, and the opposite bottom end thereof protrudes out of the roller cutter drill bit device.

[0008] Furthermore, the drill bit connecting device includes a top flange and a bottom flange which are arranged opposite to each other and are respectively fixedly mounted on the outer circle of the mud conduit, a flange connecting piece which plays a connecting and fastening role, and a plurality of first reinforcing support ribs; the top flange is used to be detachably fixed to the flange at the bottom end of the drill pipe conduit through the flange connecting piece, and the bottom flange is used to be detachably fixed to the flange at the top end of the guide radial wheel device through the flange connecting piece; the plurality of first reinforcing support ribs are arranged in sequence and spaced apart along the circumferential direction between the top flange and the bottom flange, and each first reinforcing support rib is respectively welded and fixed to the top flange, the bottom flange and the outer wall of the mud conduit.

[0009] Furthermore, the guide diameter wheel device includes a first annular cylinder that is solidly arranged and fixedly mounted on the outer circle of the mud conduit, a top flange and a bottom flange fixed at the upper and lower ends of the first annular cylinder, a flange connector that plays a connecting and fastening role, a guide diameter ring mounted on the outer circle of the first annular cylinder, and a plurality of support plates that play a connecting and supporting role; the first annular cylinder is detachably fixed to the bottom end of the corresponding drill bit connecting device and the top end of the counterweight device through the top flange and the bottom flange and the flange connector at its two ends; the plurality of support plates are arranged in sequence at intervals along the circumference of the first annular cylinder, and the inner and outer sides thereof are fixedly connected to the outer wall surface of the first annular cylinder and the inner wall surface of the guide diameter ring respectively; the axial length of the guide diameter ring is less than the length of the first annular cylinder, and the two ends of the guide diameter ring are not aligned with the corresponding two ends of the first annular cylinder.

[0010] Furthermore, the guide wheel device also includes a first reinforcing circular ring frame for enhancing the connection strength between the first circular cylinder and the top flange at the top, the first reinforcing circular ring frame including: a steel ring fixedly mounted on the outer circle of the upper end of the first circular cylinder, and a plurality of steel bars serving as a connecting support; the plurality of steel bars are arranged in sequence at intervals along the circumference of the first circular cylinder, and the upper and lower ends of each steel bar are respectively fixed to the top flange and the steel ring, and the inner end thereof is welded and fixed to the outer wall of the first circular cylinder.

[0011] Furthermore, the guide wheel device also includes a plurality of second reinforcing support ribs for enhancing the connection strength between the first circular cylinder and the bottom flange at the bottom end; the plurality of second reinforcing support ribs are arranged in sequence along the circumference of the first circular cylinder, and each second reinforcing support rib is respectively welded and fixed to the outer side surface of the first circular cylinder and the bottom flange.

[0012] Furthermore, the counterweight device includes a second annular cylinder that is solidly arranged and fixedly mounted on the outer circle of the mud conduit, a top flange and a bottom flange fixed to the upper and lower ends of the second annular cylinder, and a flange connector that plays a connecting and fastening role; the second annular cylinder is detachably fixed to the bottom end of the corresponding guide wheel device and the top end of the roller cutter bit device through the top flange and the bottom flange at both ends and the flange connector. The counterweight device also includes a second reinforcing annular frame for enhancing the connection strength between the second annular cylinder and the top flange, and the second reinforcing annular frame includes: a steel ring fixedly mounted on the outer circle of the upper end of the second annular cylinder, and a plurality of steel bars that play a connecting and supporting role; the plurality of steel bars are sequentially spaced along the circumference of the second annular cylinder, and the upper and lower ends of each steel bar are respectively fixed to the top flange and the steel ring, and the inner end thereof is welded and fixed to the outer wall surface of the second annular cylinder. The counterweight device also includes a plurality of third reinforcing support ribs for enhancing the connection strength between the second circular cylinder and the bottom flange at the bottom end; the plurality of third reinforcing support ribs are arranged in sequence along the circumference of the second circular cylinder, and each third reinforcing support rib is respectively welded and fixed to the outer side surface and the bottom flange of the second circular cylinder.

[0013] Furthermore, the roller cutter drill bit device includes a third annular cylinder that is solidly arranged and fixedly mounted on the outer circle of the mud conduit, a top flange fixed to the top of the third annular cylinder, a flange connector that serves to connect and tighten, a plurality of protruding cylinders, and a cutter disc for grinding drilling; the third annular cylinder is detachably fixed to the bottom end of the counterweight device through the top flange at its top and the flange connector; the plurality of protruding cylinders are fixed on the outer circle of the third annular cylinder at intervals in sequence along the circumference of the third annular cylinder; the cutter disc is fixed to the bottom ends of the third annular cylinder and the plurality of protruding cylinders.

[0014] Furthermore, the cutter disc includes an annular outer disc extending along the outer circumference of the third annular cylinder and the outer circumference of multiple protrusion cylinders, a hob bracket fixed to the bottom end of each protrusion cylinder in sequence along the circumferential direction and to the bottom end and center of the third annular cylinder in sequence and at intervals along the circumferential direction, and a toothed hob rotatably mounted on each hob bracket; the hob bracket at the bottom end of each protrusion cylinder and the toothed hob mounted on the hob bracket constitute an annular outer ring hob, and the outer ring hob part extends radially out of the outer disc; the hob bracket at the bottom end of the third annular cylinder and the toothed hob mounted on the hob bracket constitute an annular middle ring hob; the hob bracket at the center of the bottom end of the third annular cylinder and the toothed hob mounted on the hob bracket constitute a center hob.

[0015] Furthermore, the outer end circular cross-section of each toothed hob on the outer ring hob, the middle ring hob and the center hob is larger than the inner end circular cross-section, forming a frustum shape, and the inner end of each toothed hob extends upwardly and obliquely toward the center, and the center line of the toothed hob forms an angle of 20° to 50° with the corresponding fifth circular cylinder and the bottom end surface of the protrusion cylinder, respectively, and the outer end of each toothed hob is arranged toward the outer disk side, wherein the outer end of each toothed hob on the outer ring hob extends radially out of the outer disk.

[0016] Furthermore, the bottom end of the third annular cylinder is flush with the bottom ends of the multiple protruding cylinders; the bottom end surface of the toothed hob is lower than the bottom end surface of the outer disk; the bottom end surface of the outer disk is lower than the bottom end surface of the mud duct; the bottom end surface of the mud duct is lower than the bottom end surfaces of the protruding cylinder and the third annular cylinder.

[0017] The utility model has the following beneficial effects:

[0018] The utility model discloses a roller cutter drill bit assembly for hard ground formations. Due to the arrangement of the drill bit connection device, the guide diameter wheel device and the counterweight device, the overall weight of the roller cutter drill bit assembly is increased, the stability and cutting ability of the roller cutter drill bit device at the bottom end of the roller cutter drill bit assembly are increased, rocks can be effectively broken and debris can be removed, and the drill bit can be prevented from being stuck and buried when drilling in hard ground formations such as fine sand, medium sand, gravel, isolated rocks or isolated rock groups, granite, etc., thereby improving the drilling efficiency of cast-in-place piles. At the same time, due to the setting of the rectangular protrusions of the guide diameter wheel device and the roller cutter drill bit device, it is also beneficial to control the diameter and verticality of the bored pile hole during the bored pile hole drilling process, thereby improving the hole quality of the bored pile; on the other hand, the roller cutter drill bit assembly of the utility model comprises a drill bit connecting device, a guide diameter wheel device, a counterweight device and a roller cutter drill bit device which are sequentially arranged and fixedly connected along the axial direction, and a mud conduit is sequentially penetrated and connected to the four along the axial direction, so that the mud generated during the drilling process can be promptly discharged from the pile hole, thereby improving the drilling efficiency of the bored pile.

[0019] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0021] Figure 1 It is a schematic diagram of the spatial structure of a roller cutter drill bit assembly for hard formations according to a preferred embodiment of the utility model;

[0022] Figure 2 yes Figure 1 A schematic diagram of a sectional front view structure;

[0023] Figure 3 yes Figure 1 Schematic diagram of the spatial structure of the medium-tooth roller cutter drill bit device.

[0024] Legend:

[0025] 801, drill pipe guide tube; 802, mud guide tube; 803, drill bit connection device; 8031, top flange; 8032, bottom flange; 8033, first reinforcing support rib; 8034, reinforcing connection steel bar; 804, guide diameter wheel device; 8043, first annular cylinder; 8044, guide diameter ring; 8045, first reinforcing annular frame; 8046, second reinforcing support rib; 805, counterweight device; 8053, second annular cylinder; 8054, second reinforced annular frame; 8055, third reinforced supporting ribs; 806, roller cutter bit device; 8062, third annular cylinder; 8063, third reinforced annular frame; 8064, convex block cylinder; 8065, rectangular convex block; 8066, cutter disc; 80661, cutter bracket; 80662, toothed cutter; 80663, outer disc; 8067, slag suction nozzle. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. However, the present invention can be implemented in a variety of different ways as defined and covered below.

[0027] Reference Figure 1-2The preferred embodiment of the utility model provides a roller cutter drill bit assembly for hard formations, comprising: a drill bit connection device 803 for connecting to a drill pipe guide tube 801 of a drilling rig, a guide wheel device 804 for increasing the weight of the roller cutter drill bit assembly and controlling the diameter and verticality of the bored pile hole, a counterweight device 805 for increasing the weight of the roller cutter drill bit assembly, a roller cutter drill bit device 806 for grinding drilling, and a mud guide tube 802 for sucking and discharging the slurry generated during the drilling process out of the pile hole. The drill bit connection device 803, the guide wheel device 804, the counterweight device 805 and the roller cutter drill bit device 806 are sequentially arranged along the axial direction and are detachably fixed. The mud conduit 802 is axially connected to the drill bit connection device 803, the guide wheel device 804, the counterweight device 805 and the roller cutter drill bit device 806 in sequence, and the top end of the mud conduit 802 is also connected to the drill pipe conduit 801, and its opposite bottom end extends out of the roller cutter drill bit device 806.

[0028] The utility model of the roller cutter drill bit assembly for hard formations is advantageous in increasing the overall weight of the roller cutter drill bit assembly due to the arrangement of the drill bit connection device 803, the guide diameter wheel device 804 and the counterweight device 805, thereby increasing the stability and cutting ability of the roller cutter drill bit device 806 at the bottom end of the roller cutter drill bit assembly, effectively breaking rocks and removing debris, preventing the drill bit from getting stuck and buried when drilling in hard formations such as fine sand, medium sand, gravel, boulders or boulders, granite, etc., thereby improving the drilling efficiency of cast-in-place piles. At the same time, due to the arrangement of the guide diameter wheel device 804 and the rectangular protrusion 8065 of the roller cutter drill bit device 806, it is also advantageous in controlling the diameter and verticality of the cast-in-place pile hole during the drilling process of the cast-in-place pile hole, thereby improving the hole quality of the cast-in-place pile. On the other hand, the roller cutter drill bit assembly of the utility model includes a drill bit connection device 803, a guide wheel device 804, a counterweight device 805 and a roller cutter drill bit device 806 which are sequentially arranged and fixedly connected along the axial direction, and a mud conduit 802 is sequentially penetrated and connected to the four along the axial direction, so that the mud generated during the drilling process can be discharged from the pile hole in time, thereby improving the drilling efficiency of the cast-in-place pile.

[0029] Alternatively, if Figure 2As shown, the drill bit connection device 803 includes a top flange 8031 ​​and a bottom flange 8032 which are arranged opposite to each other and are respectively fixedly mounted on the outer circle of the mud conduit 802, a flange connector for connecting and fastening, and a plurality of first reinforcing support ribs 8033. The top flange 8031 ​​is used to be detachably fixed to the flange at the bottom end of the drill pipe conduit 801 through the flange connector, and the bottom flange 8032 is used to be detachably fixed to the flange at the top end of the guide radial wheel device 804 through the flange connector. A plurality of first reinforcing support ribs 8033 are sequentially arranged and spaced between the top flange 8031 ​​and the bottom flange 8032 along the circumferential direction, and each first reinforcing support rib 8033 is respectively welded and fixed to the top flange 8031, the bottom flange 8032 and the outer wall of the mud conduit 802.

[0030] In this optional solution, the mud conduit 802 is a hollow conduit, which is located at the center of the top flange 8031 ​​and the bottom flange 8032 and is arranged at a 90° angle with the top flange 8031 ​​and the bottom flange 8032; preferably, as Figure 2 As shown, the outer diameter of the top flange 8031 ​​is smaller than the outer diameter of the bottom flange 8032. The outer diameter of the top flange 8031 ​​is the same as the outer diameter of the bottom flange of the drill pipe guide 801 and is connected to it. The outer diameter of the bottom flange 8032 is the same as the outer diameter of the top flange of the guide wheel device 804 and is connected to it. The connecting parts between the two flanges are connected by high-strength large hexagonal bolts, large hexagonal nuts, washers and gaskets for steel structures. In this optional solution, if Figure 1-2 As shown, the first reinforcing support rib 8033 is made of Q345C stainless steel plate with a thickness of 18 mm and is processed into a "triangle" rib, which mainly serves to strengthen the mud conduit 802 and the top flange 8031 ​​and the bottom flange 8032. The effect of the first reinforcing support rib 8033 is: it is conducive to the smooth flow of mud from the top of the bored pile hole to the bottom of the bored pile hole; it is conducive to reducing the upward lifting resistance of the roller cutter drill bit assembly when the roller cutter drill bit assembly is lifted upward; it is conducive to the connection between the drill pipe conduit 801 and the roller cutter drill bit assembly; strengthen the connection between the top flange 8031 ​​and the mud conduit 802, and between the bottom flange 8032 and the mud conduit 802, to prevent the mud conduit 802, the top flange 8031 ​​and the bottom flange 8032 from being welded loosely, resulting in separation and falling off, causing a drilling safety accident.

[0031] Preferably, if Figure 1 and 2As shown, after the drill bit connection device 803 and the guide wheel device 804 are connected through the flange, a plurality of reinforcing connecting steel bars 8034 are evenly arranged along the circumference of the outer wall of the flange connection. Each reinforcing connecting steel bar 8034 is made of Q345C stainless steel plate with a thickness of 50mm and is processed into a rectangular steel bar with a length of 150mm and a width of 80mm, and is welded on the circumference of the outer wall of the adjacent flange between the drill bit connection device 803 and the guide wheel device 804. The arrangement of the reinforcing connecting steel bars 8034 prevents the bolts and nuts between the adjacent flanges from loosening, causing the drill bit connection device 803 and the guide wheel device 804 to separate and fall off, causing a drilling safety accident; during the drilling of the cast-in-place pile, it prevents the adjacent flange connection from contacting and rubbing with the drill residue in the pile hole of the cast-in-place pile, thereby wearing the flange.

[0032] Alternatively, if Figure 1 and 2 As shown, the guide wheel device 804 includes a first annular cylinder 8043 which is solidly arranged and fixedly sleeved on the outer circle of the mud conduit 802, a top flange and a bottom flange fixed on the upper and lower ends of the first annular cylinder 8043, a flange connector for connecting and fastening, a guide diameter ring 8044 sleeved on the outer circle of the first annular cylinder 8043, and a plurality of support plates for connecting and supporting. The first annular cylinder 8043 is detachably fixed to the bottom end of the corresponding drill bit connection device 803 and the top end of the counterweight device 805 through the top flange and the bottom flange at both ends and the flange connector. The plurality of support plates are sequentially spaced along the circumference of the first annular cylinder 8043, and the inner and outer sides thereof are respectively fixedly connected to the outer wall surface of the first annular cylinder 8043 and the inner wall surface of the guide diameter ring 8044. The axial length of the guide diameter ring 8044 is less than the length of the first annular cylinder 8043, and the two ends of the guide diameter ring 8044 are not aligned with the corresponding two ends of the first annular cylinder 8043. The setting of the guide diameter wheel device 804 is conducive to increasing the overall weight of the roller cutter drill bit assembly, increasing the stability and cutting ability of the bottom roller cutter drill bit device 806, and reducing the risk of the drilling process; it is conducive to controlling the diameter and verticality of the bored pile hole, preventing the lifting roller cutter drill bit assembly from being stuck at the blade foot of the pre-embedded permanent steel casing, and ensuring that the roller cutter drill bit assembly enters and exits the permanent steel casing smoothly. In this optional solution, the connection and setting method of the top flange and the bottom flange of the guide diameter wheel device 804 are respectively the same as the top flange 8031 ​​and the bottom flange 8032 in the drill bit connection device 803.

[0033] In this optional solution, the guide diameter ring 8044 is made of Q345C stainless steel plate with a thickness of 50mm and is processed into a circular hollow steel pipe with an outer diameter of 2100mm and a height of 800mm. At the intersection corners of the outer side of the guide diameter ring 8044 and the two end faces of the guide diameter ring 8044, the "triangle" is cut off and polished to form upper and lower inclined surfaces, which is beneficial for operators not to be injured by the intersection corners of the guide diameter ring 8044 during operation. The upper inclined surface of the guide diameter ring 8044 is also beneficial for the mud to flow smoothly from the top of the cast-in-place pile hole to the bottom of the cast-in-place pile hole; it is beneficial for reducing the upward lifting resistance of the roller cutter bit assembly when the roller cutter bit assembly is lifted upward; the lower inclined surface of the guide diameter ring 8044 is beneficial for the mud in the cast-in-place pile hole to overflow smoothly when the roller cutter bit assembly is lowered downward, reducing the downward lowering resistance of the roller cutter bit assembly.

[0034] Furthermore, four "rectangular" support plates are evenly arranged on the circumference of the outer wall of the first annular cylinder 8043, and the first annular cylinder 8043 and the guide diameter ring 8044 are welded and connected into a whole. The support plate is made of Q345C stainless steel plate with a thickness of 50mm. After welding, a cavity is left between the guide diameter ring 8044 and the first annular cylinder 8043, and the guide diameter ring 8044 is suspended on the outside of the "rectangular" support plate, which is conducive to the overflow of drilling slag at the bottom of the bored pile hole, speeding up the drilling of the drill bit and improving the drilling efficiency of the bored pile; it is conducive to the smooth flow of mud from the top of the bored pile hole to the bottom of the bored pile hole; it is conducive to reducing the upward lifting resistance or downward lowering resistance of the roller cutter drill bit assembly when the roller cutter drill bit assembly is lifted or lowered.

[0035] Preferably, if Figure 1 and 2 As shown, the guide wheel device 804 also includes a first reinforcing ring frame 8045 for enhancing the connection strength between the first annular cylinder 8043 and the top flange at the top, and the first reinforcing ring frame 8045 includes: a steel ring fixedly mounted on the outer circle of the upper end of the first annular cylinder 8043, and a plurality of steel bars that play a connecting and supporting role. The plurality of steel bars are sequentially arranged at intervals along the circumference of the first annular cylinder 8043, and the upper and lower ends of each steel bar are respectively fixed to the top flange and the steel ring, and the inner side end thereof is welded and fixed to the outer wall surface of the first annular cylinder 8043. During design, a connecting screw hole is set on the top flange between two adjacent steel bars. The setting of the first reinforcing ring frame 8045 can effectively prevent the first annular cylinder 8043 and the top flange from being separated and falling off due to the loose welding, thereby causing a drilling safety accident.

[0036] Preferably, if Figure 1 and 2As shown, the guide wheel device 804 also includes a plurality of second reinforcing support ribs 8046 for enhancing the connection strength between the first annular cylinder 8043 and the bottom flange at the bottom. The plurality of second reinforcing support ribs 8046 are sequentially arranged at intervals along the circumference of the first annular cylinder 8043, and each second reinforcing support rib 8046 is respectively welded and fixed to the outer side surface and the bottom flange of the first annular cylinder 8043. In this preferred embodiment, the second reinforcing support rib 8046 is made of Q345C stainless steel plate with a thickness of 18 mm and is processed into a "triangular" rib, which mainly plays the role of reinforcing the support of the first annular cylinder 8043 and the bottom flange, and prevents the first annular cylinder 8043 and the bottom flange from being separated and falling off due to the loose welding between the first annular cylinder 8043 and the bottom flange, causing a drilling safety accident.

[0037] Preferably, if Figure 1 and 2 As shown, after the guide wheel device 804 and the counterweight device 805 are connected through the flange, a plurality of reinforcing connecting steel bars 8034 are evenly arranged along the circumference of the outer wall of the flange connection. Each reinforcing connecting steel bar 8034 is made of Q345C stainless steel plate with a thickness of 50mm and is processed into a rectangular steel bar with a length of 150mm and a width of 80mm, and is welded on the circumference of the outer wall of the adjacent flange between the guide wheel device 804 and the counterweight device 805. The arrangement of the reinforcing connecting steel bars 8034 prevents the bolts and nuts between the adjacent flanges from loosening, resulting in the separation and falling off between the guide wheel device 804 and the counterweight device 805, causing a drilling safety accident; during the drilling of the cast-in-place pile, it prevents the adjacent flange connection from contacting and rubbing with the drill residue in the pile hole of the cast-in-place pile, thereby wearing the flange.

[0038] Alternatively, if Figure 1 and 2As shown, the counterweight device 805 includes a second annular cylinder 8053 which is solidly arranged and fixedly mounted on the outer circle of the mud conduit 802, a top flange and a bottom flange fixed to the upper and lower ends of the second annular cylinder 8053, and a flange connector for connecting and fastening. The second annular cylinder 8053 is detachably fixed to the bottom end of the corresponding guide wheel device 804 and the top end of the roller cutter bit device 806 through the top flange and the bottom flange at both ends and the flange connector. The counterweight device 805 also includes a second reinforcing circular ring frame 8054 for reinforcing the connection strength between the second circular cylinder 8053 and the top flange at the top. The second reinforcing circular ring frame 8054 includes: a steel ring fixedly mounted on the outer circle of the upper end of the second circular cylinder 8053, and a plurality of steel bars that play a connecting and supporting role; the plurality of steel bars are sequentially spaced along the circumference of the second circular cylinder 8053, and the upper and lower ends of each steel bar are respectively fixed to the top flange and the steel ring, and the inner side ends thereof are welded and fixed to the outer wall surface of the second circular cylinder 8053. The counterweight device 805 also includes a plurality of third reinforcing support ribs 8055 for reinforcing the connection strength between the second circular cylinder 8053 and the bottom flange at the bottom; the plurality of third reinforcing support ribs 8055 are sequentially spaced along the circumference of the second circular cylinder 8053, and each third reinforcing support rib 8055 is respectively welded and fixed to the outer side surface and the bottom flange of the second circular cylinder 8053. In this optional solution, the connection and setting methods of the top flange and the bottom flange of the counterweight device 805 are respectively the same as the top flange 8031 ​​and the bottom flange 8032 in the drill bit connection device 803; the counterweight device 805 also includes a second reinforcing ring frame and a third reinforcing support rib, and the structure and setting methods of the second reinforcing ring frame and the third reinforcing support rib are respectively the same as the first reinforcing ring frame 8045 and the second reinforcing support rib 8046 in the guide radial wheel device 804. The setting of the counterweight device 805 is conducive to increasing the weight of the roller cutter drill bit assembly, increasing the stability and cutting ability of the roller cutter drill bit device 806, and reducing the risk of the drilling process.

[0039] Preferably, if Figure 1 and 2As shown, after the counterweight device 805 and the roller cutter bit device 806 are connected through the flange, a plurality of reinforcing connecting steel bars 8034 are evenly arranged along the outer wall circumference of the flange connection. Each reinforcing connecting steel bar 8034 is made of Q345C stainless steel plate with a thickness of 50mm and is processed into a rectangular steel bar with a length of 150mm and a width of 80mm, and is welded on the outer wall circumference of the adjacent flange between the counterweight device 805 and the roller cutter bit device 806. The arrangement of the reinforcing connecting steel bars 8034 prevents the bolts and nuts between the adjacent flanges from loosening, resulting in the separation and falling off between the counterweight device 805 and the roller cutter bit device 806, causing a drilling safety accident; during the drilling of the cast-in-place pile, it prevents the adjacent flange connection from contacting and rubbing with the drill residue in the pile hole of the cast-in-place pile, thereby wearing the flange.

[0040] Alternatively, if Figure 2 and Figure 3 As shown, the roller cutter bit device 806 includes a third annular cylinder 8062 which is solidly arranged and fixedly mounted on the outer circle of the mud conduit, a top flange fixed to the top of the third annular cylinder 8062, a flange connector for connecting and fastening, a plurality of protruding cylinders 8064, a cutter head 8066 for grinding drilling, and a rectangular protruding block 8065 for controlling the diameter and verticality of the bored pile hole. The third annular cylinder 8062 is detachably fixed to the bottom end of the counterweight device through the top flange and the flange connector at its top. The plurality of protruding cylinders 8064 are fixed on the outer circle of the third annular cylinder 8062 at intervals in sequence along the circumference of the third annular cylinder 8062. The cutter head 8066 is fixed to the bottom ends of the third annular cylinder 8062 and the plurality of protruding cylinders 8064.

[0041] Preferably, if Figure 2-3 As shown, a circle of Q345C steel ring with a thickness of 100mm and a width of 60mm is welded on the outer wall circumference of the third circular cylinder 8062 at a position 200mm from the bottom of the top flange at the top of the third circular cylinder 8062. 22 steel bars with a length of 170mm, a thickness of 100mm and a width of 50mm are vertically welded between the steel ring and the top flange. The two ends of each steel bar are respectively welded to the steel ring and the bottom of the top flange, and the inner end of the steel bar is welded to the outer wall of the third circular cylinder 8062. The third reinforcing circular frame 8063 is provided to prevent the third circular cylinder 8062 and the top flange from being separated and falling off due to loose welding, thereby causing drilling safety accidents.

[0042] Furthermore, if Figure 2 and Figure 3As shown, a "triangle" is cut off within 300mm of the outer side of the projection cylinder 8064 from the bottom surface of the third reinforcing ring frame 8063 and polished to be a bevel, and the outer side of the projection cylinder 8064 is divided into an upper bevel and a lower straight side; the inner and outer sides of each projection cylinder 8064 are arc-shaped along the width direction of the projection cylinder 8064, that is, a "pentagonal" arc-shaped projection cylinder 8064 is formed. After the projection cylinder 8064 is welded, a vertical "concave" groove with a certain spacing is left between adjacent projection cylinders 8064, which is conducive to the mud in the cast-in-place pile hole flowing into the bottom of the cast-in-place pile hole along the "concave" groove.

[0043] Furthermore, if Figure 3 As shown, on the outer arc surface of each protrusion cylinder 8064, a rectangular protrusion 8065 is welded correspondingly up and down along the vertical direction of the protrusion cylinder 8064, and the length side of the rectangular protrusion 8065 is consistent with the vertical direction of the protrusion cylinder 8064. The rectangular protrusion 8065 is arranged to prevent the protrusion cylinder 8064 of the roller cutter drill bit device from contacting and rubbing with the drill residue in the pile hole of the cast-in-place pile during the drilling of the cast-in-place pile, thereby wearing the protrusion cylinder 8064 of the roller cutter drill bit device; through the horizontal rotation of the roller cutter drill bit device 806, the rectangular protrusion 8065 is driven to cut the wall stratum of the cast-in-place pile hole horizontally, effectively controlling the diameter and verticality of the cast-in-place pile hole, so that the diameter and verticality of the cast-in-place pile hole meet the design and standard specification requirements.

[0044] In this option, if Figure 3 As shown, the cutter disc 8066 includes an outer disc 80663 extending and arranged along the outer circumference of the third annular cylinder 8062 and the outer circumference of the plurality of protruding cylinders 8064 and in an annular shape, a hob bracket 80661 fixed to the bottom end of each protruding cylinder 8064 in sequence along the circumferential direction and fixed to the bottom end and the center of the third annular cylinder 8062 in sequence along the circumferential direction at intervals, and an inlaid tooth hob 80662 rotatably mounted on each hob bracket 80661. The hob bracket 80661 at the bottom end of each protruding cylinder 8064 and the inlaid tooth hob 80662 mounted on the hob bracket 80661 constitute an annular outer ring hob, and the outer ring hob portion extends radially out of the outer disc 80663. The hob bracket 80661 at the bottom end of the third annular cylinder 8062 and the inlaid tooth hob 80662 mounted on the hob bracket 80661 constitute an annular middle ring hob. The hob bracket 80661 at the bottom center of the third annular cylinder 8062 and the toothed hob 80662 mounted on the hob bracket 80661 constitute a central hob. Further, the toothed hob 80662 includes a hob shaft and a hob cylinder, and the two ends of the hob shaft are fixedly connected to the hob bracket 80661 by bolts, respectively. The middle of the hob shaft is sleeved with a hob cylinder that rolls around the rolling shaft, and a plurality of pointed grinding heads are embedded on the outer surface of the hob cylinder, and the plurality of grinding heads are evenly spaced and arranged on the hob cylinder.

[0045] Preferably, if Figure 2 and Figure 3 As shown, the outer end circular cross-section of each toothed hob 80662 on the outer ring hob, the middle ring hob and the center hob is larger than the inner end circular cross-section, forming a frustum shape, and the inner end of each toothed hob 80662 extends upwardly and obliquely toward the center, and the center line of the toothed hob 80662 forms an angle of 20° to 50° with the corresponding fifth circular cylinder 8062 and the bottom end surface of the protrusion cylinder 8064, and the outer end of each toothed hob 80662 is arranged toward the outer disk 80663, wherein the outer end of each toothed hob 80662 on the outer ring hob extends radially out of the outer disk 80663. Since the outer ends of the toothed cutters 80662 on the outer ring cutter extend radially out of the outer disk 80663, it is beneficial for the roller cutter bit device 806 to cut a circular pile hole with a diameter greater than 40 to 100 mm of the bored pile hole diameter, ensuring that the bored pile hole diameter is greater than or equal to the design diameter requirement; and it also reduces the amount of drill slag adhering to the drill bit in the bored pile hole. During operation, the roller cutter bit device 806 is driven by the rotation of the drill pipe guide tube 801 of the drilling rig, so that the moving track of the toothed cutter 80662 forms a roller cutter grinding track ring, and the moving track of the roller cutter bit device 806 forms a roller grinding track ring. Multiple roller cutter grinding track rings and multiple roller grinding track rings completely cover the third annular cylinder 8062 and the bottom end surface of the protruding block cylinder 8064, so as to cut isolated stones or isolated stone groups and granite.

[0046] Preferably, if Figure 2 As shown, the bottom end of the third annular cylinder 8062 is flush with the bottom end of the multi-block protrusion cylinder 8064. The bottom end surface of the toothed hob 80662 is lower than the bottom end surface of the outer disk 80663. The bottom end surface of the outer disk 80663 is lower than the bottom end surface of the mud conduit 802, and the bottom end surface of the mud conduit 802 is lower than the bottom end surfaces of the protrusion cylinder 8064 and the third annular cylinder 8062. In actual design, the bottom end surface of the mud duct 802, i.e., the slag suction inlet 8067, is made higher than the bottom end surface of the outer plate 80663 by 50-100 mm, so that the slag suction inlet 8067 can timely suck the drilled slag at the bottom of the bored pile hole out of the bored pile hole through the mud duct 802; the bottom end surface of the outer plate 80663 is made higher than the bottom end surface of the toothed cutter 80662 by 50-100 mm, which is conducive to the toothed cutter 80662 cutting the isolated stone or isolated stone group and granite, and prevents the outer plate 80663 from contacting and rubbing with the isolated stone or isolated stone group and granite at the bottom of the bored pile hole, thereby wearing the outer plate 80663 and being unfavorable for collecting and accommodating the drilled slag in the bored pile hole.

[0047] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A roller cutter drill bit assembly for hard formations, characterized in that: include: A drill bit connection device (803) for connecting to a drill pipe guide tube (801) of a drilling rig, a guide wheel device (804) for increasing the weight of a roller cutter drill bit assembly and controlling the diameter and verticality of a cast-in-place pile hole, a counterweight device (805) for increasing the weight of a roller cutter drill bit assembly, a roller cutter drill bit device (806) for grinding drilling, and a slurry guide tube (802) for sucking and discharging slurry generated during the drilling process out of the pile hole; The drill bit connection device (803), the guide wheel device (804), the counterweight device (805) and the roller cutter drill bit device (806) are sequentially arranged along the axial direction and are detachably fixed; The mud conduit (802) is axially penetrated in sequence by a drill bit connection device (803), a guide wheel device (804), a counterweight device (805) and a roller cutter bit device (806), and the top end of the mud conduit (802) is also connected to the drill pipe conduit (801), and the bottom end thereof extends out of the roller cutter bit device (806).

2. The roller cutter drill bit assembly for hard formation according to claim 1, characterized in that: The drill bit connection device (803) comprises a top flange (8031) and a bottom flange (8032) which are arranged opposite to each other and respectively fixedly sleeved on the outer circle of the mud conduit (802), a flange connection piece having a connection and fastening function, and a plurality of first reinforcing support strips (8033); The top flange (8031) is used to be detachably fixed to the flange at the bottom end of the drill pipe guide tube (801) through a flange connector, and the bottom flange (8032) is used to be detachably fixed to the flange at the top end of the guide radial wheel device (804) through a flange connector; A plurality of first reinforcing support ribs (8033) are arranged in sequence and at intervals between the top flange (8031) and the bottom flange (8032) along the circumferential direction, and each first reinforcing support rib (8033) is respectively welded and fixed to the top flange (8031), the bottom flange (8032) and the outer wall surface of the mud conduit (802).

3. The roller cutter drill bit assembly for hard formation according to claim 1, characterized in that: The guide wheel device (804) comprises a first annular cylinder (8043) which is solidly arranged and fixedly sleeved on the outer circle of the mud conduit (802), a top flange and a bottom flange fixed to the upper and lower ends of the first annular cylinder (8043), a flange connector for connecting and fastening, a guide ring (8044) sleeved on the outer circle of the first annular cylinder (8043), and a plurality of support plates for connecting and supporting. The first annular cylinder (8043) is detachably fixed to the bottom end of the corresponding drill bit connecting device (803) and the top end of the counterweight device (805) through the top flange and the bottom flange at both ends and the flange connecting pieces; The plurality of support plates are sequentially arranged at intervals along the circumference of the first annular cylinder (8043), and the inner and outer sides of the support plates are respectively fixedly connected to the outer wall surface of the first annular cylinder (8043) and the inner wall surface of the guide diameter ring (8044); The axial length of the guide diameter ring (8044) is shorter than the length of the first circular cylinder (8043), and the two ends of the guide diameter ring (8044) are not aligned with the corresponding two ends of the first circular cylinder (8043).

4. The roller cutter drill bit assembly for hard formation according to claim 3, characterized in that: The guide wheel device (804) further comprises a first reinforcing circular ring frame (8045) for reinforcing the connection strength between the first circular cylinder (8043) and the top flange at the top end. The first reinforcing circular ring frame (8045) comprises: A steel ring fixedly mounted on the outer circle of the upper end of the first circular cylinder (8043), and a plurality of steel bars serving as connecting supports; A plurality of steel bars are arranged in sequence and at intervals along the circumference of the first circular cylinder (8043), and the upper and lower ends of each steel bar are respectively fixed to the top flange and the steel ring, and the inner end thereof is welded and fixed to the outer wall surface of the first circular cylinder (8043).

5. The roller cutter drill bit assembly for hard formation according to claim 3, characterized in that: The guide wheel device (804) further comprises a plurality of second reinforcing support ribs (8046) for enhancing the connection strength between the first annular cylinder (8043) and the bottom flange at the bottom end; A plurality of second reinforcing support ribs (8046) are sequentially arranged at intervals along the circumference of the first circular cylinder (8043), and each second reinforcing support rib (8046) is respectively welded and fixed to the outer side surface and the bottom flange of the first circular cylinder (8043).

6. The roller cutter drill bit assembly for hard formation according to claim 1, characterized in that: The counterweight device (805) comprises a second annular cylinder (8053) which is solidly arranged and fixedly sleeved on the outer circle of the mud conduit (802), a top flange and a bottom flange fixed to the upper and lower ends of the second annular cylinder (8053), and a flange connector for connecting and fastening; The second annular cylinder (8053) is detachably fixed to the bottom end of the corresponding guide wheel device (804) and the top end of the roller cutter drill bit device (806) through the top flange and the bottom flange and the flange connecting pieces at both ends thereof; The counterweight device (805) further comprises a second reinforcing circular ring frame (8054) for reinforcing the connection strength between the second circular ring cylinder (8053) and the top flange at the top end. The second reinforcing circular ring frame (8054) comprises: A steel ring fixedly mounted on the outer circle of the upper end of the second circular cylinder (8053), and a plurality of steel bars serving as connecting supports; A plurality of steel bars are arranged in sequence and at intervals along the circumference of the second annular cylinder (8053), and the upper and lower ends of each steel bar are respectively fixed to the top flange and the steel ring, and the inner end thereof is welded and fixed to the outer wall surface of the second annular cylinder (8053); The counterweight device (805) further comprises a plurality of third reinforcing support ribs (8055) for enhancing the connection strength between the second annular cylinder (8053) and the bottom flange at the bottom end; A plurality of third reinforcing support ribs (8055) are sequentially arranged at intervals along the circumference of the second circular cylinder (8053), and each third reinforcing support rib (8055) is respectively welded and fixed to the outer side surface and the bottom flange of the second circular cylinder (8053).

7. The roller cutter drill bit assembly for hard formation according to claim 1, characterized in that: The roller cutter bit device (806) comprises a third annular cylinder (8062) which is solidly arranged and fixedly sleeved on the outer circle of the mud conduit, a top flange fixed to the top of the third annular cylinder (8062), a flange connector for connecting and fastening, a plurality of protruding cylinders (8064), and a cutter disc (8066) for grinding and drilling; The third annular cylinder (8062) is detachably fixed to the bottom end of the counterweight device via a top flange and a flange connector at its top end; A plurality of convex cylinders (8064) are fixed on the outer circle of the third circular cylinder (8062) at intervals in sequence along the circumference of the third circular cylinder (8062); The cutter disc (8066) is fixed to the bottom ends of the third annular cylinder (8062) and the plurality of protruding block cylinders (8064).

8. The roller cutter drill bit assembly for hard formation according to claim 7, characterized in that: The cutter disc (8066) comprises an annular outer disc (80663) extending along the outer circumference of the third annular cylinder (8062) and the outer circumference of the plurality of convex cylinders (8064), a hob bracket (80661) fixed in sequence along the circumferential direction to the bottom end of each convex cylinder (8064) and fixed in sequence along the circumferential direction to the bottom end and the center of the third annular cylinder (8062), and an inlaid tooth hob (80662) rotatably mounted on each hob bracket (80661); The hob bracket (80661) at the bottom end of each convex block cylinder (8064) and the toothed hob (80662) mounted on the hob bracket (80661) form an annular outer ring hob, and the outer ring hob portion extends radially out of the outer disc (80663); The hob support (80661) at the bottom end of the third circular cylinder (8062) and the toothed hob (80662) mounted on the hob support (80661) form an annular middle ring hob; The hob support (80661) at the bottom center of the third circular cylinder (8062) and the toothed hob (80662) mounted on the hob support (80661) constitute a central hob.

9. The roller cutter drill bit assembly for hard formation according to claim 8, characterized in that: The outer end circular cross-section of each toothed hob (80662) on the outer ring hob, the middle ring hob and the center hob is larger than the inner end circular cross-section, and is in the shape of a truncated cone. The inner end of each toothed hob (80662) extends upwardly and obliquely toward the center, and the center line of the toothed hob (80662) forms an angle of 20° to 50° with the corresponding fifth circular cylinder and the bottom end surface of the protrusion cylinder (8064). The outer end of each toothed hob (80662) is arranged toward the outer disk (80663), wherein the outer end of each toothed hob (80662) on the outer ring hob extends radially out of the outer disk (80663).

10. The roller cutter drill bit assembly for hard formation according to claim 8, characterized in that: The bottom end of the third annular cylinder (8062) is flush with the bottom ends of the plurality of protruding cylinders (8064); The bottom end surface of the toothed hob (80662) is lower than the bottom end surface of the outer disc (80663); The bottom end surface of the outer plate (80663) is lower than the bottom end surface of the mud conduit (802); The bottom end surface of the mud conduit (802) is lower than the bottom end surfaces of the protruding block cylinder (8064) and the third annular cylinder (8062).

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