Three-wing drill bit assembly part for soft stratum

Abstract

The utility model discloses a three-wing drill bit assembly part for a soft stratum. Comprising a drill bit connecting device used for being connected with a drill rod guide pipe of a drilling machine, a guide diameter wheel device used for increasing the weight of a three-wing drill bit assembly part and controlling the diameter and perpendicularity of a pile hole of a cast-in-place pile, a balance weight device used for increasing the weight of the three-wing drill bit assembly part and a three-wing drill bit device used for drilling a stratum. 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 balance weight device and the three-wing drill bit device are sequentially arranged in the axial direction and detachably fixed. The slurry guide pipe sequentially penetrates through and is connected with the four devices in the axial direction, the top end of the slurry guide pipe is further communicated with the drill rod guide pipe, and the opposite bottom end of the slurry guide pipe extends out of the bottom end of a three-wing support in the three-wing drill bit device. According to the three-wing drill bit assembly part, the stability and the cutting capacity of a three-wing drill bit device are improved, and the technical problem that a drill bit is burnt when the drill bit drills in a soft stratum is solved.

Description

Technical Field

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

[0002] Cast-in-place piles are often used in the foundations of high-rise buildings, bridges, basements, large industrial plants, etc. Common methods for drilling holes for cast-in-place piles are long spiral drills, impact drills, rotary drills, manual digging and circulation drills.

[0003] In the construction of circulating drilling of cast-in-place piles, ordinary three-wing drill bits or four-wing drill bits are mostly used. Because the ordinary three-wing drill bit has a short mud guide tube, the front cutting space of the three-wing drill bit is small and the drilling slag capacity is small; the four-wing drill bit is a compact, narrow cage structure, so when working, the cut clay drill cuttings cannot be discharged from the cast-in-place pile hole in time with the mud suction pipe, but wrap the drill bit. When cutting plain fill, silty clay, and silty clay layers, if the relative density of the mud is greater than 1.15g / cm3 and the viscosity is greater than 20Pa·s, the drill bit components will not be lubricated, the friction resistance will increase, and the friction will cause the drill bit components to heat up, which will promote the adhesion of clay drill cuttings to the components; and because the drill bit rotates too slowly, the clay drill cuttings attached to the components are subjected to small centrifugal force and cannot be thrown out by the centrifugal force, which will promote and accelerate the development of "mud drilling", resulting in the stop of cast-in-place pile drilling and reduced drilling efficiency. Utility Model Content

[0004] The utility model provides a three-wing drill bit assembly for soft formations, which solves the technical problem of "drilling confusion" existing in the existing common four-wing drill bits.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A three-wing drill bit assembly for soft formations comprises: a drill bit connection device for connecting to a drill pipe guide tube of a drilling rig, a guide wheel device for increasing the weight of the three-wing drill bit assembly and controlling the diameter and verticality of a bored pile hole, a counterweight device for increasing the weight of the three-wing drill bit assembly, a three-wing drill bit device for drilling into formations, and a mud guide tube 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 three-wing drill bit device are sequentially arranged along the axial direction and detachably fixed; the mud guide tube is sequentially penetrated and connected to the drill bit connection device, the guide wheel device, the counterweight device and the three-wing drill bit device along the axial direction, and the top end of the mud guide tube is also connected to the drill pipe guide tube, and the opposite bottom end thereof extends out of the bottom end of a three-wing bracket in the three-wing drill bit device.

[0007] 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.

[0008] 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.

[0009] 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.

[0010] 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.

[0011] 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 three-wing drill 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.

[0012] Furthermore, the three-wing drill bit device includes a three-wing bracket for installation and support, a top flange fixed to the top of the three-wing bracket, a flange connector for connection and fastening, and a guide drill bit for drilling; the three-wing bracket is fixedly mounted on the outer circle of the mud conduit, and is detachably fixed to the bottom end of the counterweight device through the top flange at its top and the flange connector. The three-wing bracket is hollowed out to allow mud to pass through, and is also provided with cutting teeth for cutting and drilling; the guide drill bit is located at the bottom end of the three-wing bracket and is fixedly mounted on the outer circle of the mud conduit, and the bottom end of the mud conduit extends into the guide drill bit.

[0013] Furthermore, the three-wing bracket includes three wing plates and a hollow ring-shaped gauge ring; the three wing plates are evenly spaced along the circumference of the mud conduit, and the inner end of each wing plate is welded and fixed to the outer wall of the mud conduit, and the top flange is fixed to the top of the three wing plates at the same time, and the lower oblique edge of each wing plate is also provided with cutting teeth that are arranged in sequence at intervals along the oblique edge and extend downward; the gauge ring is fixedly mounted on the outer ends of the three wing plates, and the outer circle of the gauge ring is also provided with cutting teeth that are arranged in sequence at intervals along the circumference and extend downward.

[0014] Furthermore, the guide drill bit includes a guide drill bit mounting plate fixed on the outer circle of the bottom end of the mud pipe, and the lower end of the guide drill bit mounting plate is provided with two inclined extending mounting edges, and each mounting edge is provided with cutting teeth that are arranged in sequence and spaced apart along the direction of the mounting edge and extend downward.

[0015] Furthermore, an inwardly extending mounting groove is provided at the top of the guide drill bit mounting plate, and a slag suction water inlet is also provided on the plate surface of the guide drill bit mounting plate, which vertically penetrates the plate surface, and the slag suction water inlet is connected to the mounting groove; the bottom end of the mud conduit is vertically inserted into the mounting groove and is connected to the slag suction water inlet.

[0016] The utility model has the following beneficial effects:

[0017] The three-wing drill assembly for soft formations of the utility model is conducive to increasing the overall weight of the three-wing drill assembly due to the arrangement of the drill connection device, the guide diameter wheel device and the counterweight device, thereby increasing the stability and cutting ability of the three-wing drill device at the bottom of the three-wing drill assembly, thereby reducing the risk of the drilling process. At the same time, due to the arrangement of the guide diameter wheel device and the diameter protection ring of the three-wing drill device, it is also conducive to controlling the diameter and verticality of the bored pile hole during the drilling process, thereby improving the hole quality of the bored pile. On the other hand, a mud duct is set and lengthened in the three-wing drill bit device. Compared with the existing three-wing or four-wing drill bits, the cutting space at the front of the three-wing drill bit device is increased, and the drill cuttings capacity at the bottom of the bored pile hole is increased. A hollow three-wing bracket is set in the three-wing drill bit device, which is beneficial to increasing the drill bit space and reducing the contact area between the drill cuttings and the three-wing bracket, thereby solving the technical problem of "drilling stickiness" when the drill bit is drilling in soft formations such as plain fill, silty clay, and silty clay, shortening the drilling time and improving the drilling efficiency of bored piles.

[0018] 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

[0019] 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:

[0020] Figure 1 This is a schematic diagram of the spatial structure of a three-wing drill bit assembly for soft formations according to a preferred embodiment of the utility model;

[0021] Figure 2 yes Figure 1 A schematic diagram of a sectional front view structure;

[0022] Figure 3 yes Figure 1 Schematic diagram of the main structure of the three-wing drill bit device.

[0023] Legend:

[0024] 701, drill pipe guide tube; 702, mud guide tube; 703, drill bit connection device; 7031, top flange; 7032, bottom flange; 7033, first reinforcing support rib; 7034, reinforcing connection steel bar; 704, guide diameter wheel device; 7043, first annular cylinder; 7044, guide diameter ring; 7045, first reinforcing annular frame; 7046, second reinforcing support rib; 705, counterweight device; 7053, second annular cylinder; 7054, second reinforcing annular frame; 7055, third reinforcing support rib; 706, three-wing drill bit device; 7062, three-wing bracket; 7063, gauge ring; 7064, cutting tooth; 7065, slag suction nozzle; 7066, guide drill bit. DETAILED DESCRIPTION

[0025] 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.

[0026] Reference Figure 1-2 The preferred embodiment of the utility model provides a three-wing drill assembly for soft formations, comprising: a drill connection device 703 for connecting to a drill pipe guide tube 701 of a drilling rig, a guide wheel device 704 for increasing the weight of the three-wing drill assembly and controlling the diameter and verticality of the bored pile hole, a counterweight device 705 for increasing the weight of the three-wing drill assembly, a three-wing drill device 706 for drilling into the formation, and a mud guide tube 702 for sucking and discharging the slurry generated during the drilling process out of the pile hole. The drill connection device 703, the guide wheel device 704, the counterweight device 705 and the three-wing drill device 706 are sequentially arranged along the axial direction and are detachably fixed. The mud conduit 702 is axially connected to the drill bit connection device 703, the guide wheel device 704, the counterweight device 705 and the three-wing drill bit device 706 in sequence, and the top of the mud conduit 702 is also connected to the drill pipe conduit 701, and its opposite bottom end extends out of the bottom end of the three-wing bracket 7062 in the three-wing drill bit device 706.

[0027] The three-wing drill assembly for soft formations of the utility model is helpful to increase the overall weight of the three-wing drill assembly due to the arrangement of the drill connection device 703, the guide diameter wheel device 704 and the counterweight device 705, and to increase the stability and cutting ability of the three-wing drill device 706 at the bottom of the three-wing drill assembly, thereby reducing the risk of the drilling process. At the same time, due to the arrangement of the guide diameter wheel device 704 and the diameter protection ring 7063 of the three-wing drill device 706, it is also helpful to control the diameter and verticality of the bored pile hole during the drilling process, thereby improving the bored pile hole quality. On the other hand, a mud duct 702 is provided and lengthened in the three-wing drill bit device 706. Compared with the existing three-wing or four-wing drill bits, the front cutting space of the three-wing drill bit device 706 is increased, and the capacity of drill cuttings at the bottom of the bored pile hole is increased. A hollow three-wing bracket 7062 is provided in the three-wing drill bit device 706, which is beneficial to increasing the drill bit space and reducing the contact area between the drill cuttings and the three-wing bracket 7062, thereby solving the technical problem of "drilling stickiness" when the drill bit is drilling in soft formations such as plain fill, silty clay, and silty clay, thereby shortening the drilling time and improving the drilling efficiency of bored piles.

[0028] Alternatively, if Figure 2 As shown, the drill bit connection device 703 includes a top flange 7031 and a bottom flange 7032 which are arranged opposite to each other and fixedly mounted on the outer circle of the mud conduit 702, a flange connector for connecting and fastening, and a plurality of first reinforcing support ribs 7033. The top flange 7031 is used to be detachably fixed to the flange at the bottom end of the drill pipe conduit 701 through the flange connector, and the bottom flange 7032 is used to be detachably fixed to the flange at the top end of the guide radial wheel device 704 through the flange connector. A plurality of first reinforcing support ribs 7033 are arranged in sequence and spaced apart between the top flange 7031 and the bottom flange 7032 along the circumferential direction, and each first reinforcing support rib 7033 is welded and fixed to the top flange 7031, the bottom flange 7032 and the outer wall of the mud conduit 702, respectively.

[0029] In this optional solution, the mud conduit 702 is a hollow conduit, and the mud conduit 702 is located at the center of the top flange 7031 and the bottom flange 7032 and is arranged at a 90° angle with the top flange 7031 and the bottom flange 7032; preferably, as Figure 2 As shown, the outer diameter of the top flange 7031 is smaller than the outer diameter of the bottom flange 7032. The outer diameter of the top flange 7031 is the same as the outer diameter of the bottom flange of the drill pipe guide 701 and is connected to it. The outer diameter of the bottom flange 7032 is the same as the outer diameter of the top flange of the guide wheel device 704 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 1-2As shown, the first reinforcing support rib 7033 is made of Q345C stainless steel plate with a thickness of 18 mm and is processed into a "triangular" rib, which mainly serves to strengthen the mud conduit 702 and the top flange 7031 and the bottom flange 7032. The effect of the first reinforcing support rib 7033 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 three-wing drill bit assembly when the three-wing drill bit assembly is lifted upward; it is conducive to the connection between the drill pipe conduit 701 and the three-wing drill bit assembly; strengthen the connection between the top flange 7031 and the mud conduit 702, and between the bottom flange 7032 and the mud conduit 702, to prevent the mud conduit 702, the top flange 7031 and the bottom flange 7032 from being welded loosely, resulting in separation and falling off, causing a drilling safety accident.

[0030] Preferably, if Figure 1 and 2 As shown, after the drill bit connection device 703 and the guide wheel device 704 are connected through the flange, a plurality of reinforced connection steel bars 7034 are evenly arranged along the circumference of the outer wall of the flange connection. Each reinforced connection steel bar 7034 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 703 and the guide wheel device 704. The arrangement of the reinforced connection steel bars 7034 prevents the bolts and nuts between the adjacent flanges from loosening, causing the drill bit connection device 703 and the guide wheel device 704 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.

[0031] Alternatively, if Figure 1 and 2As shown, the guide wheel device 704 includes a first annular cylinder 7043 which is solidly arranged and fixedly sleeved on the outer circle of the mud conduit 702, a top flange and a bottom flange fixed on the upper and lower ends of the first annular cylinder 7043, a flange connector for connecting and fastening, a guide diameter ring 7044 sleeved on the outer circle of the first annular cylinder 7043, and a plurality of support plates for connecting and supporting. The first annular cylinder 7043 is detachably fixed to the bottom end of the corresponding drill bit connecting device 703 and the top end of the counterweight device 705 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 7043, and the inner and outer sides thereof are respectively fixedly connected to the outer wall surface of the first annular cylinder 7043 and the inner wall surface of the guide diameter ring 7044. The axial length of the guide diameter ring 7044 is less than the length of the first annular cylinder 7043, and the two ends of the guide diameter ring 7044 are not aligned with the corresponding two ends of the first annular cylinder 7043. The setting of the guide diameter wheel device 704 is conducive to increasing the overall weight of the three-wing drill assembly, increasing the stability and cutting ability of the three-wing drill device 706 at the bottom end of the three-wing drill assembly, and reducing the risk of the drilling process; it is conducive to controlling the diameter and verticality of the bored pile hole, preventing the three-wing drill assembly from being stuck at the blade foot of the pre-embedded permanent steel casing, and ensuring that the three-wing drill 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 704 are respectively the same as the top flange 7031 and the bottom flange 7032 in the drill bit connection device 703.

[0032] In this optional solution, the guide diameter ring 7044 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 7044 and the two end faces of the guide diameter ring 7044, 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 7044 during operation. The upper inclined surface of the guide diameter ring 7044 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 the three-wing drill bit assembly to be lifted upward, reducing the upward lifting resistance of the three-wing drill bit assembly; the lower inclined surface of the guide diameter ring 7044 is beneficial for the mud in the cast-in-place pile hole to overflow smoothly when the three-wing drill bit assembly is lowered, reducing the downward lowering resistance of the three-wing drill bit assembly.

[0033] Furthermore, four "rectangular" support plates are evenly arranged on the circumference of the outer wall of the first annular cylinder 7043, and the first annular cylinder 7043 and the guide diameter ring 7044 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 7044 and the first annular cylinder 7043, and the guide diameter ring 7044 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 three-wing drill assembly when the three-wing drill assembly is lifted or lowered.

[0034] Preferably, if Figure 1 and 2 As shown, the guide wheel device 704 also includes a first reinforcing ring frame 7045 for enhancing the connection strength between the first annular cylinder 7043 and the top flange at the top, and the first reinforcing ring frame 7045 includes: a steel ring fixedly mounted on the outer circle of the upper end of the first annular cylinder 7043, 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 7043, 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 7043. During design, a connecting screw hole is set on the top flange 7041 between two adjacent steel bars. The setting of the first reinforcing ring frame 7045 can effectively prevent the first annular cylinder 7043 and the top flange from being separated and falling off due to the loose welding, thereby causing a drilling safety accident.

[0035] Preferably, if Figure 1 and 2 As shown, the guide wheel device 704 also includes a plurality of second reinforcing support ribs 7046 for enhancing the connection strength between the first annular cylinder 7043 and the bottom flange at the bottom. The plurality of second reinforcing support ribs 7046 are sequentially arranged at intervals along the circumference of the first annular cylinder 7043, and each second reinforcing support rib 7046 is respectively welded and fixed to the outer side surface and the bottom flange of the first annular cylinder 7043. In this preferred embodiment, the second reinforcing support rib 7046 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 7043 and the bottom flange, and prevents the first annular cylinder 7043 and the bottom flange from being separated and falling off due to the loose welding between the first annular cylinder 7043 and the bottom flange, causing a drilling safety accident.

[0036] Preferably, if Figure 1 and 2As shown, after the guide wheel device 704 and the counterweight device 705 are connected through the flange, a plurality of reinforcing connecting steel bars 7034 are evenly arranged along the circumference of the outer wall of the flange connection. Each reinforcing connecting steel bar 7034 is made of Q345C stainless steel plate with a thickness of 50 mm and is processed into a rectangular steel bar with a length of 150 mm and a width of 80 mm, and is welded on the circumference of the outer wall of the adjacent flange between the guide wheel device 704 and the counterweight device 705. The arrangement of the reinforcing connecting steel bars 7034 prevents the bolts and nuts between the adjacent flanges from loosening, resulting in the separation and falling off between the guide wheel device 704 and the counterweight device 705, 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 cast-in-place pile hole, thereby wearing the flange.

[0037] Alternatively, if Figure 1 and 2As shown, the counterweight device 705 includes a second annular cylinder 7053 which is solid and fixedly mounted on the outer circle of the mud conduit 702, a top flange and a bottom flange fixed to the upper and lower ends of the second annular cylinder 7053, and a flange connector for connecting and fastening. The second annular cylinder 7053 is detachably fixed to the bottom end of the corresponding guide wheel device 704 and the top end of the three-wing drill bit device 706 through the top flange and the bottom flange at both ends and the flange connector. The counterweight device 705 also includes a second reinforcing circular ring frame 7054 for reinforcing the connection strength between the second circular cylinder 7053 and the top flange at the top. The second reinforcing circular ring frame 7054 includes: a steel ring fixedly mounted on the outer circle of the upper end of the second circular cylinder 7053, 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 7053, 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 7053. The counterweight device 705 also includes a plurality of third reinforcing support ribs 7055 for reinforcing the connection strength between the second circular cylinder 7053 and the bottom flange at the bottom; the plurality of third reinforcing support ribs 7055 are sequentially spaced along the circumference of the second circular cylinder 7053, and each third reinforcing support rib 7055 is respectively welded and fixed to the outer side surface and the bottom flange of the second circular cylinder 7053. In this optional solution, the connection and setting methods of the top flange and the bottom flange of the counterweight device 705 are respectively the same as the top flange 7031 and the bottom flange 7032 in the drill bit connection device 703; the counterweight device 705 also includes a second reinforcing circular frame 7054 and a third reinforcing support rib 7055, and the structure and setting methods of the second reinforcing circular frame 7054 and the third reinforcing support rib 7055 are respectively the same as the first reinforcing circular frame 7045 and the second reinforcing support rib 7046 in the guide radial wheel device 704. The setting of the counterweight device 705 is conducive to increasing the weight of the three-wing drill bit assembly, increasing the stability and cutting ability of the three-wing drill bit device 706, and reducing the risk of the drilling process.

[0038] Preferably, if Figure 1 and 2As shown, after the counterweight device 705 and the three-wing drill bit device 706 are connected through the flange, a plurality of reinforced connecting steel bars 7034 are evenly arranged along the circumference of the outer wall of the flange connection. Each reinforced connecting steel bar 7034 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 counterweight device 705 and the three-wing drill bit device 706. The arrangement of the reinforced connecting steel bars 7034 prevents the bolts and nuts between the adjacent flanges from loosening, resulting in the separation and falling off between the counterweight device 705 and the three-wing drill bit device 706, 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.

[0039] Alternatively, if Figure 2 and Figure 3 As shown, the three-wing drill bit device 706 includes a three-wing bracket 7062 for installation support, a top flange fixed to the top of the three-wing bracket 7062, a flange connector for connection and fastening, a pilot drill bit 7066 for drilling, and a gauge ring 7063 for controlling the diameter and verticality of the bored pile hole. The three-wing bracket 7062 is fixedly sleeved on the outer circle of the mud pipe 702, and is detachably fixed to the bottom end of the counterweight device 705 through the top flange and the flange connector at the top of the three-wing bracket 7062. The three-wing bracket 7062 is hollowed out to allow mud to pass through, and is also provided with cutting teeth 7064 for cutting and drilling. The pilot drill bit 7066 is located at the bottom end of the three-wing bracket 7062 and is fixedly sleeved on the outer circle of the mud pipe 702. The bottom end of the mud pipe 702 extends into the pilot drill bit 7066. In this optional solution, the hollow three-wing bracket 7062 is set to increase the drill bit space, reduce the contact area between the drill cuttings and the three-wing bracket 7062, prevent the drill bit from getting stuck when drilling in soft formations such as plain fill, silty clay, and silty clay, and improve the drilling efficiency of cast-in-place piles.

[0040] In this option, if Figure 2 and 3As shown, the three-wing bracket 7062 includes three wing plates and a hollow ring-shaped gauge ring 7063. The three wing plates are evenly spaced along the circumference of the mud conduit 702, and the inner end of each wing plate is welded and fixed to the outer wall of the mud conduit 702. The top flange is fixed to the top of the three wing plates at the same time. The lower bevel of each wing plate is also provided with cutting teeth 7064 that are sequentially spaced and extended downward along the bevel. The gauge ring 7063 is fixedly sleeved on the outer ends of the three wing plates, and the outer circle of the gauge ring 7063 is also provided with cutting teeth 7064 that are sequentially spaced and extended downward along the circumference. In this optional solution, the gauge ring 7063 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 2200mm. The gauge ring 7063 is welded and connected to the mud conduit 702 and the top flange through three wing plates. During welding, the root end of the cutting teeth 7064 is connected to the gauge ring 7063 by manual arc welding. The setting of the cutting teeth 7064 on the gauge ring 7063 prevents the gauge ring 7063 from contacting and rubbing with the drilled slag in the bored pile hole, thereby wearing the gauge ring 7063; the horizontal rotation of the gauge ring 7063 drives the cutting teeth 7064 to horizontally cut the bored pile hole wall stratum, effectively controlling the bored pile hole diameter and verticality, so that the bored pile hole diameter and verticality meet the design and standard specification requirements.

[0041] In this optional solution, a drill cuttings overflow port is formed between the top flange and the gauge ring 7063. The setting of the drill cuttings overflow port reduces the contact area between the three-wing drill bit device 706 and the drill cuttings, which is beneficial to the drilling of the three-wing drill bit device 706 and solves the problem of drill bit sticking when the drill bit is drilling in soft formations such as plain fill, silty clay, and silty clay, thereby shortening the drilling time and improving the bored pile drilling efficiency; it is beneficial for the mud to flow smoothly from the top of the bored pile hole to the bottom of the bored pile hole; it is beneficial for reducing the upward lifting resistance or downward lowering resistance of the three-wing drill bit assembly when the three-wing drill bit assembly is lifted or lowered. In this optional solution, the setting of the cutting teeth 7064 on the gauge ring 7063 prevents the gauge ring 7063 from contacting and rubbing with the drilled residue in the bored pile hole, thereby wearing the gauge ring 7063; the horizontal rotation of the gauge ring 7063 drives the cutting teeth 7064 to horizontally cut the bored pile hole wall stratum, effectively controlling the bored pile hole diameter and verticality, so that the bored pile hole diameter and verticality meet the design and standard specifications. In this optional solution, if Figure 2 and 3 As shown, the guide drill bit 7066 includes a guide drill bit 7066 mounting plate fixed on the outer circle of the bottom end of the mud conduit 702, and the lower end of the guide drill bit 7066 mounting plate is provided with two inclined extending mounting edges, and each mounting edge is provided with cutting teeth 7064 which are arranged in sequence and spaced apart along the direction of the mounting edge and extend downward.

[0042] Furthermore, if Figure 3As shown, the top of the guide drill bit 7066 mounting plate is provided with an inwardly extending mounting groove, and the plate surface of the guide drill bit 7066 mounting plate is also provided with a slag suction water inlet 7065 that vertically penetrates the plate surface, and the slag suction water inlet 7065 is connected to the mounting groove. The bottom end of the mud pipe 702 is vertically inserted into the mounting groove and is connected to the slag suction water inlet 7065. In this optional scheme, the slag suction water inlet 7065 is semi-elliptical. The setting of the "semi-elliptical" slag suction water inlet 7065 is conducive to expanding the size of the slag suction water inlet 7065, increasing the amount of slag suction of the bottom of the bored pile hole, and timely sucking the bottom of the bored pile hole out of the bored pile hole through the mud pipe 702 to prevent clay drill cuttings from wrapping the guide drill bit 7066 and causing the drill bit to become stuck.

[0043] 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 three-wing drill bit assembly for soft formations, characterized in that: include: A drill bit connection device (703) for connecting to a drill pipe guide tube (701) of a drilling machine, a guide wheel device (704) for increasing the weight of a three-wing drill bit assembly and controlling the diameter and verticality of a bored pile hole, a counterweight device (705) for increasing the weight of the three-wing drill bit assembly, a three-wing drill bit device (706) for drilling into a formation, and a mud guide tube (702) for sucking and discharging slurry generated during the drilling process out of the pile hole; The drill bit connection device (703), the guide wheel device (704), the counterweight device (705) and the three-wing drill bit device (706) are sequentially arranged along the axial direction and are detachably fixed; The mud conduit (702) is axially connected to the drill bit connection device (703), the guide wheel device (704), the counterweight device (705) and the three-wing drill bit device (706) in sequence, and the top end of the mud conduit (702) is also connected to the drill pipe conduit (701), and the opposite bottom end thereof extends out of the bottom end of the three-wing bracket (7062) in the three-wing drill bit device (706).

2. The three-wing drill bit assembly for soft formations according to claim 1, characterized in that: The drill bit connection device (703) comprises a top flange (7031) and a bottom flange (7032) which are arranged opposite to each other and respectively fixedly sleeved on the outer circle of the mud conduit (702), a flange connection piece for connecting and fastening, and a plurality of first reinforcing support strips (7033); The top flange (7031) is used to be detachably fixed to the flange at the bottom end of the drill pipe guide tube (701) through a flange connector, and the bottom flange (7032) is used to be detachably fixed to the flange at the top end of the guide radial wheel device (704) through a flange connector; A plurality of first reinforcing support ribs (7033) are arranged in sequence and at intervals between the top flange (7031) and the bottom flange (7032) along the circumferential direction, and each first reinforcing support rib (7033) is respectively welded and fixed to the top flange (7031), the bottom flange (7032) and the outer wall of the mud conduit (702).

3. The three-wing drill bit assembly for soft formations according to claim 1, characterized in that: The guide wheel device (704) comprises a first annular cylinder (7043) which is solidly arranged and fixedly sleeved on the outer circle of the mud pipe (702), a top flange and a bottom flange fixed on the upper and lower ends of the first annular cylinder (7043), a flange connector for connecting and fastening, a guide ring (7044) sleeved on the outer circle of the first annular cylinder (7043), and a plurality of support plates for connecting and supporting. The first annular cylinder (7043) is detachably fixed to the bottom end of the corresponding drill bit connecting device (703) and the top end of the counterweight device (705) through the top flange and the bottom flange and the flange connecting pieces at both ends thereof; A plurality of support plates are arranged in sequence and at intervals along the circumference of the first annular cylinder (7043), and the inner and outer sides of the support plates are respectively fixedly connected to the outer wall surface of the first annular cylinder (7043) and the inner wall surface of the guide diameter ring (7044); The axial length of the guide diameter ring (7044) is smaller than the length of the first circular cylinder (7043), and the two ends of the guide diameter ring (7044) are not aligned with the corresponding two ends of the first circular cylinder (7043).

4. The three-wing drill bit assembly for soft formations according to claim 3, characterized in that: The guide wheel device (704) further comprises a first reinforcing circular ring frame (7045) for reinforcing the connection strength between the first circular cylinder (7043) and the top flange at the top end. The first reinforcing circular ring frame (7045) comprises: A steel ring fixedly mounted on the outer circle of the upper end of the first circular cylinder (7043), and a plurality of steel bars serving as connecting supports; A plurality of steel bars are arranged in sequence along the circumference of the first annular cylinder (7043) at intervals, 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 annular cylinder (7043).

5. The three-wing drill bit assembly for soft formations according to claim 3, characterized in that: The guide wheel device (704) further comprises a plurality of second reinforcing support ribs (7046) for enhancing the connection strength between the first annular cylinder (7043) and the bottom flange at the bottom end; A plurality of second reinforcing support ribs (7046) are arranged in sequence and at intervals along the circumference of the first annular cylinder (7043), and each second reinforcing support rib (7046) is respectively welded and fixed to the outer side surface and the bottom flange of the first annular cylinder (7043).

6. The three-wing drill bit assembly for soft formations according to claim 1, characterized in that: The counterweight device (705) comprises a second annular cylinder (7053) which is solidly arranged and fixedly sleeved on the outer circle of the mud conduit (702), a top flange and a bottom flange fixed at the upper and lower ends of the second annular cylinder (7053), and a flange connector for connecting and fastening; The second annular cylinder (7053) is detachably fixed to the bottom end of the corresponding guide wheel device (704) and the top end of the three-wing drill bit device (706) through the top flange and the bottom flange and the flange connector at both ends; The counterweight device (705) further comprises a second reinforcing circular ring frame (7054) for reinforcing the connection strength between the second circular ring cylinder (7053) and the top flange at the top end. The second reinforcing circular ring frame (7054) comprises: A steel ring fixedly mounted on the outer circle of the upper end of the second circular cylinder (7053), 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 (7053), 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 (7053); The counterweight device (705) further comprises a plurality of third reinforcing support strips (7055) for enhancing the connection strength between the second annular cylinder (7053) and the bottom flange at the bottom end; A plurality of third reinforcing support ribs (7055) are arranged in sequence and at intervals along the circumference of the second annular cylinder (7053), and each third reinforcing support rib (7055) is respectively welded and fixed to the outer side surface and the bottom flange of the second annular cylinder (7053).

7. The three-wing drill bit assembly for soft formations according to claim 1, characterized in that: The three-wing drill bit device (706) comprises a three-wing bracket (7062) for installation support, a top flange fixed to the top of the three-wing bracket (7062), a flange connector for connection and fastening, and a guide drill bit (7066) for drilling. The three-wing bracket (7062) is fixedly sleeved on the outer circle of the mud conduit (702), and is detachably fixed to the bottom end of the counterweight device (705) through the top flange and the flange connector at the top end thereof. The three-wing bracket (7062) is hollowed out to allow mud to pass through, and is also provided with cutting teeth (7064) for cutting and drilling. The guide drill bit (7066) is located at the bottom end of the three-wing bracket (7062) and is fixedly sleeved on the outer circle of the mud conduit (702), and the bottom end of the mud conduit (702) extends into the guide drill bit (7066).

8. The three-wing drill bit assembly for soft formations according to claim 7, characterized in that: The three-wing bracket (7062) includes three wing plates and a hollow ring-shaped gauge ring (7063); The three wing plates are evenly spaced along the circumference of the mud conduit (702), and the inner end of each wing plate is welded and fixed to the outer wall of the mud conduit (702). The top flange is also fixed to the top of the three wing plates. The lower bevel of each wing plate is also provided with cutting teeth (7064) that are sequentially spaced and extended downward along the bevel. The gauge ring (7063) is fixedly sleeved on the outer ends of the three wing plates, and the outer circle of the gauge ring (7063) is also provided with cutting teeth (7064) which are arranged in sequence and spaced apart in the circumferential direction and extend downward.

9. The three-wing drill bit assembly for soft formations according to claim 7, characterized in that: The guide drill bit (7066) includes a guide drill bit (7066) mounting plate fixed on the outer circle of the bottom end of the mud conduit (702), and the lower end of the guide drill bit (7066) mounting plate is provided with two inclined extending mounting edges, and each mounting edge is provided with cutting teeth (7064) arranged in sequence and extending downward along the direction of the mounting edge.

10. The three-wing drill bit assembly for soft formations according to claim 9, characterized in that: The top of the guide drill bit (7066) mounting plate is provided with an inwardly extending mounting groove, and the plate surface of the guide drill bit (7066) mounting plate is also provided with a slag suction water inlet (7065) vertically penetrating the plate surface, and the slag suction water inlet (7065) is connected to the mounting groove; The bottom end of the mud conduit (702) is vertically inserted into the mounting groove and communicated with the slag suction water inlet (7065).

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