CN109882107B - Method for salvaging drill bit and device for salvaging drill bit - Google Patents
Method for salvaging drill bit and device for salvaging drill bit Download PDFInfo
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- CN109882107B CN109882107B CN201910233856.6A CN201910233856A CN109882107B CN 109882107 B CN109882107 B CN 109882107B CN 201910233856 A CN201910233856 A CN 201910233856A CN 109882107 B CN109882107 B CN 109882107B
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Abstract
The invention discloses a method for salvaging a drill bit and a device for salvaging the drill bit, and relates to the technical field of bored pile construction. When the drill bit falls off, the bottom end of the drill rod is contacted with the fallen drill bit, and whether the fallen drill bit is in the vertical direction is judged. When the drill bit is not in the vertical direction and the inclination angle of the fallen drill bit is larger, the inclination angle and the central hole coordinate of the drill bit are determined firstly, then the drill bit fisher is obliquely arranged at the lower part of a drill rod of the drilling machine, the drill rod is used for downwards probing, the drill bit fisher is directly inserted into the central hole of the drill bit, and the inverted tooth structure of the drill bit fisher is used for being clamped with the internal thread of the central hole of the drill bit, so that the drill bit is fished out timely and quickly, and the problem of the existing drill bit salvage is solved.
Description
Technical Field
The invention relates to the technical field of bored pile construction, in particular to a method for salvaging a drill bit and a device for salvaging the drill bit.
Background
During the drilling process of the bored pile, accidents such as separation of a drill bit from a drill rod, breakage of a drill rod body and the like can occur occasionally, so that the drill bit falls to the bottom of the hole. Once the drill bit falls off, the drill bit must be salvaged out in time, otherwise, the hole wall is opened for a long time to easily cause collapse of the hole wall, on one hand, the drill bit can not be taken out to be scrapped, on the other hand, other complex technical measures are needed to be taken for continuous drilling construction, even pile foundations are scrapped to change the design when serious, the construction period is delayed, and huge economic loss is caused.
Because the fallen drill bit is positioned in the slurry with the depth of tens of meters underground, the drill bit cannot be seen or touched, and the salvaging difficulty is very high. At present, the salvaging measures after the drill bit of the bored pile is fallen mainly comprise the following steps:
1) When the drill bit is shallow in falling-off depth and the hole wall collapses, the drill bit can be taken out by adopting an open cut method if the ground condition allows. The method needs to meet certain conditions, and has a narrow application range;
2) The metal drill bit is sucked out of the drill hole by using the strong magnetic fisher, the method has higher efficiency, but is limited by the power of the strong magnetic fisher, and if the drill bit is heavier or the drill bit is buried by collapse of the hole wall, the drill bit cannot be taken out;
3) By using the mechanical fisher, the fisher head is rigidly connected with the drill rod of the drilling machine through the flange, the mechanical fisher head is inserted into the hole in the center of the drill bit to take out the drill bit, and if the center hole of the drill bit is not in the vertical direction or the drill bit is deviated and is difficult to centralize due to various reasons, the salvaging method is difficult to implement, soil on the hole wall can be disturbed in the centralizing process, and the hole wall is easy to collapse.
Therefore, when the drill rod breaks to enable the drill bit to fall to the bottom of the hole, the drill bit is very difficult to salvage by utilizing the existing salvage technology due to the narrow drilling space, and the common salvage mode has limitations.
Disclosure of Invention
Aiming at the defects in the prior art, the invention solves the technical problems as follows: how to overcome the problem of salvaging the existing drill bit, salvage the drill bit timely and rapidly, and reduce the risk of collapse of the hole wall.
In order to achieve the above purpose, the method for fishing the drill bit provided by the invention comprises the following steps:
s1: when the drill bit falls off, slurry circulation in the hole is maintained, the bottom end of the drill rod is contacted with the fallen drill bit, whether the fallen drill bit is in the vertical direction is judged according to the actual penetration rule and the penetration rule when the drill bit falls off, and if the drill bit is not in the vertical direction, the S2 is carried out;
s2: detecting coordinates of a plurality of drill bit edge points through a drill rod, determining inclination angles of drill bits and coordinates of central holes, and turning to S3;
s3: firstly, according to the inclination angle of the drill bit, the drill bit fisher is obliquely arranged at the lower part of a drill rod of the drilling machine, then according to the center Kong Zuobiao of the drill bit, the drill bit fisher is inserted into a center hole of the drill bit, so that the inverted tooth structure of the drill bit fisher is clamped with the internal thread of the center hole of the drill bit, and finally, the drill rod is lifted through the drilling machine, and the fallen drill bit is taken out from the bottom of the hole.
Based on the technical scheme, the specific flow of determining the inclination angle of the drill bit in the step S2 is as follows:
the drill rod is firstly used for downward detection by a drilling machine, and the coordinates of any three points at the edge of the drill bit are detected to be a (x) 1 ,y 1 ,z 1 )、b(x 2 ,y 2 ,z 2 ) And c (x) 3 ,y 3 ,z 3 ) The plane formed by the three points is the inclined plane of the drill bit;
and determining the normal vector (n) of the inclined plane according to the homogeneous linear equation 1 ，n 2 ，n 3 ) The method comprises the following steps:
finally, according to the inclination angle of the drill bit being equal to the included angle between the inclined surface and the horizontal plane, the inclination angle of the drill bit is as follows:
based on the technical scheme, the specific flow of determining the center hole coordinates of the drill bit in S2 is as follows:
the drill rod is firstly used for downward detection by a drilling machine, and the coordinates of any five points at the edge of the drill bit are detected to be a (x) 1 ，y 1 ，z 1 )、b(x 2 ，y 2 ，z 2 )、c(x 3 ，y 3 ，z 3 )、d(x 4 ，y 4 ，z 4 ) And e (x) 5 ，y 5 ，z 5 )；
And then determining a general equation of the ellipse through a non-homogeneous linear equation according to the fact that the projection of the inclined surface of the drill bit on the horizontal plane is the ellipse: ax 2 +Bxy+Cy 2 +dx+ey+1=0, i.e.:
deriving a value for determining A, B, C, D and E;
finally, calculating the center hole plane coordinates O (x 0 ，y 0 ) The method comprises the following steps: x is x 0 ＝(2CD-BE)/(B 2 -4AC)，y 0 ＝(2AE-BD)/(B 2 -4 AC), calculating the coordinate z of the central hole of the drill bit in the vertical direction 0 The method comprises the following steps:
and thereby the center Kong Zuobiao (x) 0 ，y 0 ，z 0 )。
Based on the technical scheme, the specific flow for judging whether the fallen drill bit is in the vertical direction in the S1 is as follows: and (3) at the center of the pile foundation hole in the original construction, the drill rod is downwards detected by the drilling machine, when the bottom end of the downwards detected drill rod is contacted with the fallen drill bit, if the actual downwards detected drill rod is larger than the drill rod when the drill bit falls off, the fallen drill bit is judged not to be in the vertical direction, and if the actual downwards detected drill rod is equal to the drill rod when the drill bit falls off, the fallen drill bit is judged to be in the vertical direction.
Based on the technical scheme, the S1 further comprises the following steps: if the drill bit is in the vertical direction, the drill bit fisher is rigidly connected with the drill rod of the drilling machine through the flange plate, the drill rod is then used for downward probing, the drill bit fisher is directly inserted into the center hole of the fallen drill bit, the inverted tooth structure of the drill bit fisher is clamped with the internal thread of the center hole, and finally the drill rod is lifted through the drilling machine, so that the fallen drill bit is taken out from the bottom of the hole.
On the basis of the technical scheme, the vertical distance from the bottom end of the drill bit fisher obliquely installed in the step S2 to the center line of the drill rod is equal to the vertical distance from the center hole of the drill bit to the center line of the pile foundation hole.
In order to solve the technical problem, the invention also provides a device for fishing the drill bit, which comprises a drill bit fisher and a semi-flexible connecting device, wherein the lower part of the drill bit fisher is conical, the middle part of the drill bit fisher is a cylinder, the diameter of the cylinder is slightly smaller than the inner diameter of a central hole of the drill bit, the middle part of the drill bit fisher is provided with a convex inverted tooth structure, the inverted tooth structure comprises a plurality of spike parts which are inclined upwards, one end of the semi-flexible connecting device is detachably connected with the drill bit fisher, and the other end of the semi-flexible connecting device is used for being detachably connected with a drill rod of a drilling machine so as to obliquely install the drill bit fisher at the lower part of the drill rod.
On the basis of the technical scheme, the semi-flexible connecting device comprises a flexible connecting rope, an adjusting rod and two flange plates with lifting lugs, one end of the flexible connecting rope penetrates through the lifting lug of one flange plate, and the other end of the flexible connecting rope penetrates through the lifting lug of the other flange plate; two ends of the adjusting rod are fixedly connected with one flange plate respectively and are used for adjusting the included angle between the two flange plates; the two flanges are used for being detachably connected with the drill bit fisher and the drill rod of the drilling machine respectively.
On the basis of the technical scheme, the adjusting rod is made of steel bars or round steel, and two ends of the steel bars or round steel are respectively fixedly welded with one flange plate; the flexible connecting rope is made of high-strength carbon fiber, steel stranded wires or steel wire ropes.
On the basis of the technical scheme, the upper part of the drill bit fisher is provided with the annular electromagnet.
Compared with the prior art, the invention has the advantages that:
1) When the inclination angle of the fallen drill bit is larger, firstly determining the inclination angle and the central hole coordinate of the drill bit, then obliquely installing a drill bit fisher at the lower part of a drill rod of a drilling machine, using the drilling machine to downwards search the drill rod, directly inserting the drill bit fisher into the central hole of the drill bit, using the inverted tooth structure of the drill bit fisher to be clamped with the internal thread of the central hole of the drill bit, thereby timely and quickly salvaging the drill bit, solving the problem of salvaging the existing drill bit, overcoming the limitation of the rigid connection fisher on the inclined drill bit, avoiding the risk of collapse of the hole wall caused by righting construction;
2) The flange plates are detachably connected with the drill rod of the drill bit fisher and the drill rig respectively, so that the drill bit fisher is convenient to assemble and disassemble, the included angle between the two flange plates is adjusted and fixed by the adjusting rod according to the inclination angle of the drill bit, so that the inclination angle of the drill bit fisher is the same as the inclination angle of the drill bit, the drill bit fisher is convenient to directly insert into the center hole of the drill bit, the drill rod is lifted by the drill rig, the drill bit is fished out timely and quickly by the flexible connecting rope, and the collapse risk of the wall of the pile foundation hole is reduced;
3) The annular electromagnet is utilized to generate magnetic attraction force, and in the drill bit lifting process, the magnetic attraction force can increase the connection force between the drill bit fisher and the fallen drill bit, so that the drill bit is effectively prevented from slipping in the lifting process, and the salvaging success rate is further improved.
Drawings
Fig. 1 is a schematic structural view of a semi-flexible connection unit according to the present invention.
FIG. 2 is a schematic view of a drop-off drill bit according to the present invention.
FIG. 3 is a schematic view of the present invention using a semi-flexible connection to salvage drill bits.
FIG. 4 is a schematic diagram of the present invention for fishing a drill bit using a semi-flexible connection means.
Fig. 5 is a schematic structural view of the rigid connection device in the present invention.
FIG. 6 is a schematic diagram of the present invention for fishing a drill bit using a rigid connection.
In the figure: the drilling machine comprises a drill rod 1, a flexible connecting rope 2, a lifting lug 3, a ring electromagnet 4, a flange plate 5, an adjusting rod 6, a 7-inverted tooth structure 8, a drill bit fisher 9, an internal thread 10 and a drill 11.
Detailed Description
The drill bit fisher is in the prior art, a plurality of inverted tooth structures are arranged in the middle of the drill bit fisher, the term of inclination angle in the invention refers to an included angle with the vertical direction, and the embodiment of the invention is further described in detail below with reference to the accompanying drawings.
A method of fishing a drill bit, comprising the steps of:
s1: as shown in fig. 2, when the drill bit falls off, slurry circulation in the hole is kept to prevent the hole wall of the pile foundation hole from collapsing, the drill rod is downwards detected by the drilling machine 11, the bottom end of the downwards detected drill rod is contacted with the fallen drill bit 10, whether the fallen drill bit 10 is in the vertical direction is judged according to the footage when the actual downwards detected footage falls off from the drill bit, if the drill bit is not in the vertical direction, the process is shifted to S2, and if the drill bit is in the vertical direction, the process is shifted to S4;
s2: the drill 11 is utilized to move the drill rod, coordinates of a plurality of drill bit edge points are detected through the drill rod (in the embodiment, the ground plane center of the pile foundation hole is taken as an origin, a three-dimensional coordinate system is established), the inclination angle of the drill bit and the coordinates of the center hole are determined according to the coordinates of the plurality of drill bit edge points, and the process goes to S3;
s3: according to the inclination angle and the center hole coordinates of the drill bit, as shown in fig. 1, a semi-flexible connecting device is adopted to obliquely install a drill bit fisher 8 at the lower part of a drill rod 1 of a drilling machine, and as shown in fig. 3, the inclination angle of the drill bit fisher 8 is the same as the inclination angle of the drill bit, and the drill bit fisher 8 is inserted into the center hole of the drill bit in the process of downward drilling of the drill rod; according to the center Kong Zuobiao of the drill bit, the drill rod is downwards detected by the drill 11, the drill bit fisher 8 is driven to be inserted into the center hole of the drill bit, the inverted tooth structure 7 of the drill bit fisher 8 is clamped with the internal thread 9 of the center hole of the drill bit (the spike part of the inverted tooth structure 7 is clamped into the internal thread 9 groove of the center hole), the drill rod is lifted by the drill 11, and the fallen drill bit 10 is taken out from the bottom of the hole;
s4: if the drill bit is in the vertical direction, as shown in fig. 5, the drill bit fisher 8 is rigidly connected with the drill rod 1 of the drilling machine through the flange 5, as shown in fig. 6, the drill rod is then used for downward detection by the drilling machine 11, the drill bit fisher 8 is directly inserted into the center hole of the fallen drill bit 10, the inverted tooth structure 7 of the drill bit fisher 8 is used for being clamped with the internal thread 9 of the center hole, and finally the drill rod is lifted by the drilling machine 11, so that the fallen drill bit 10 is taken out from the bottom of the hole. When the fallen drill bit 10 is in the vertical direction, the drill bit fisher 8 is rigidly connected with the drill rod, and the drill bit fisher 8 is directly inserted into the central hole of the drill bit by utilizing the drilling machine 11, so that the drill bit is fished out timely and quickly, the accident is conveniently and quickly handled and salvaged, and the risk of collapse of the wall of the pile foundation hole is reduced.
In the embodiment of the invention, when the fallen drill bit 10 is not in the vertical direction and the inclination angle is larger, the inclination angle and the center hole coordinate of the drill bit are determined, then the drill bit fisher 8 is obliquely arranged at the lower part of the drill rod 1 of the drilling machine by adopting the semi-flexible connecting device, the drill rod is used for downward probing, the drill bit fisher 8 is directly inserted into the center hole of the drill bit, and the inverted tooth structure 7 of the drill bit fisher 8 is used for clamping with the internal thread 9 of the center hole of the drill bit, so that the drill bit is fished out timely and quickly, the problem of the existing drill bit salvage is solved, and the limitation of the rigid connection fisher on the inclined drill bit is overcome. In addition, the method does not need to adopt a centralizing device, and avoids the risk of hole wall collapse caused by centralizing construction.
Preferably, the specific process of determining the inclination angle of the drill in S2 is as follows: the drill rod is firstly downwards detected by the drilling machine 11, and the coordinates of any three points at the edge of the drill bit are respectively a (x 1 ,y 1 ,z 1 )、b(x 2 ,y 2 ,z 2 ) And c (x) 3 ,y 3 ,z 3 ) The plane formed by the three points is the inclined plane of the drill bit; and determining the normal vector (n) of the inclined plane according to the homogeneous linear equation 1 ,n 2 ,n 3 ) The method comprises the following steps:
In the embodiment of the invention, the coordinates of any three points on the edge of the drill bit are detected, the normal vector of an inclined plane formed by the three points is calculated, and the inclination angle of the drill bit is obtained according to the normal vector of the inclined plane, so that the drill bit fisher 8 is arranged at the lower part of the drill rod 1 of the drilling machine at the same inclination angle, the drill bit fisher 8 is conveniently inserted into the central hole of the drill bit, the quick disposal and salvage of the drill bit falling accident are realized, and the risk of collapse of the hole wall of the pile foundation hole is reduced.
Preferably, the specific process of determining the coordinates of the center hole of the drill in S2 is as follows: the drill rod is firstly downwards detected by the drilling machine 11, and the coordinates of any five points at the edge of the drill bit are detected to be a (x) 1 ，y 1 ，z 1 )、b(x 2 ，y 2 ，z 2 )、c(x 3 ，y 3 ，z 3 )、d(x 4 ，y 4 ，z 4 ) And e (x) 5 ，y 5 ，z 5 ) The method comprises the steps of carrying out a first treatment on the surface of the And then determining a general equation of the ellipse through a non-homogeneous linear equation according to the fact that the projection of the inclined surface of the drill bit on the horizontal plane is the ellipse: ax 2 +Bxy+Cy 2 +dx+ey+1=0, i.e.:
deriving a value for determining A, B, C, D and E; determining the center hole plane coordinates O (x 0 ，y 0 ) The method comprises the following steps: x is x 0 ＝(2CD-BE)/(B 2 -4AC)，y 0 ＝(2AE-BD)/(B 2 -4 AC); finally, determining the coordinate z of the center hole of the drill bit in the vertical direction 0 The method comprises the following steps: />
And thereby the center Kong Zuobiao (x) 0 ，y 0 ，z 0 )。
In the embodiment of the invention, the three-dimensional coordinates are decomposed into the horizontal plane coordinates and the vertical direction coordinates, the coordinates of any five points on the edge of the drill bit are detected through the drill rod, the projection coordinates of the central hole of the drill bit on the horizontal plane are calculated by utilizing the coordinates of the five points on the horizontal plane according to the projection of the inclined plane of the drill bit on the horizontal plane, the position coordinates of the central hole of the drill bit on the horizontal plane are determined, the coordinates of the central hole of the drill bit on the vertical direction are obtained according to the lower penetrating rule of the drill rod on the five points, the three-dimensional is converted into the plane for calculation, the calculation process of the position coordinates of the central hole of the drill bit is simplified, the drill bit is conveniently and rapidly fished out in time, and the collapse risk of the wall of the pile foundation hole is reduced.
Preferably, the specific process of determining whether the dropped drill bit 10 is in the vertical direction in S1 is as follows: at the center of the pile foundation hole of the original construction, the drill rod is downwards detected by the drilling machine 11, when the bottom end of the downwards detected drill rod is contacted with the fallen drill bit 10, if the actual downwards detected penetration gauge of the drill rod is larger than the penetration gauge of the drill bit when the drill bit falls off, the fallen drill bit 10 is judged not to be in the vertical direction, and if the actual downwards detected penetration gauge of the drill rod is equal to the penetration gauge of the drill bit when the drill bit falls off, the fallen drill bit 10 is judged to be in the vertical direction.
Preferably, the vertical distance from the bottom end of the drill bit fisher 8 mounted obliquely in S3 to the center line of the drill rod is equal to the vertical distance from the center hole (top end) of the drill bit to the center line of the pile foundation hole. In the embodiment of the invention, the drill 11 can directly insert the drill bit fisher 8 into the central hole of the drill bit by downwards probing the drill rod along the central line of the pile foundation hole, thereby reducing the difficulty of salvaging operation, facilitating timely and rapid salvaging of the drill bit and reducing the risk of collapse of the wall of the pile foundation hole.
The device for fishing the drill bit is shown in fig. 1, and comprises a drill bit fisher 8 and a semi-flexible connecting device, wherein the middle part of the drill bit fisher 8 is in a cylindrical shape, the diameter of the cylinder is slightly smaller than the inner diameter of a drill bit center hole, a convex inverted tooth structure 7 is arranged in the middle part of the drill bit fisher 8, the pointed part of each inverted tooth structure 7 is inclined upwards, and when the drill bit fisher 8 is inserted into the center hole of the drill bit, the pointed part of the inverted tooth structure 7 can be clamped with an inner thread 9 of the center hole of the drill bit (the inclined pointed part is clamped into an inner thread 9 groove of the center hole); as shown in fig. 4, one end of the semi-flexible connection device is detachably connected with the drill bit fisher 8, and the other end of the semi-flexible connection device is used for being detachably connected with the drill rod 1 of the drilling machine, so that the drill bit fisher 8 is obliquely arranged at the lower part of the drill rod.
In the embodiment of the present invention, when the included angle (inclination angle) between the fallen drill bit 10 and the vertical direction is large, as shown in fig. 3, the drill bit fisher 8 is installed at the lower part of the drill pipe in an inclined manner by using the semi-flexible connection device, and the inclination angle of the drill bit fisher 8 is the same as the inclination angle of the drill bit. The drill rod is firstly downwards detected by the drilling machine 11, the drill bit fisher 8 is driven to be directly inserted into the central hole of the drill bit, the inverted tooth structure 7 of the drill bit fisher 8 is clamped with the internal thread 9 of the central hole, the drill rod is lifted by the drilling machine 11, and the drill bit is timely and quickly fished out by the semi-flexible connecting device, so that the limitation of the existing rigid connection fisher on the fishing of the inclined drill bit is overcome. Meanwhile, the invention does not need to adopt a centralizing device, thereby effectively reducing the risk of collapse of the hole wall caused by centralizing construction.
In addition, the device for fishing the drill bit in the embodiment of the invention can be also applied to the method for fishing the drill bit, and the device and the method are combined for use, so that the effect of fishing the drill bit is greatly improved.
Preferably, as shown in fig. 1, the semi-flexible connection device comprises a flexible connection rope 2, an adjusting rod 6 and two flanges 5 with lifting lugs 3, one end of the flexible connection rope 2 passes through the lifting lug 3 of one flange 5, and the other end of the flexible connection rope 2 passes through the lifting lug 3 of the other flange 5; the two ends of the adjusting rod 6 are respectively and fixedly connected with one flange plate 5 and are used for adjusting the included angle between the two flange plates 5 (faces) to be the same as the inclination angle of the drill bit; the two flanges 5 are intended to be detachably connected to the bit fisher 8 and the drill rod 1 of the drilling machine, respectively.
In the embodiment of the invention, the flange plates 5 are respectively detachably connected with the drill bit fisher 8 and the drill rod 1 of the drilling machine, the disassembly is convenient, the included angle between the two flange plates 5 is regulated and fixed by the regulating rod 6 according to the inclination angle of the drill bit, after the two flange plates 5 are respectively connected with the drill bit fisher 8 and the drill rod 1 of the drilling machine, the inclination angle of the drill bit fisher 8 is identical with the inclination angle of the drill bit, the drill bit fisher 8 is conveniently and directly inserted into the central hole of the drill bit when the drill rod is in downward exploration, the drill rod is lifted by the drilling machine 11, the regulating rod 6 is broken or loosened under the gravity action of the drill bit, the drill bit is timely and rapidly fished by the flexible connecting rope 2, and the collapse risk of the pile foundation hole is reduced.
Preferably, the adjusting rod 6 is a steel bar or a round steel, and two ends of the steel bar or the round steel are respectively fixedly welded with one flange plate 5. According to the inclination angle of the drill bit, the included angle between the steel bar or round steel and the flange plates 5 is calculated and determined, the two flange plates 5 are fixedly connected through the steel bar or round steel, the included angle between the two flange plates 5 is ensured to be the same as the inclination angle of the drill bit, and the drill bit fisher 8 is conveniently and directly inserted into the center hole of the drill bit when the drill rod is used for probing downwards. The steel bars or round steel are selected as the adjusting rods 6, so that the materials are widely and easily available, the welding and the manufacturing are convenient, and the salvaging cost can be reduced.
Preferably, the flexible connecting rope 2 is a high-strength carbon fiber, a steel strand or a steel wire rope. The high-strength carbon fiber, the steel strand and the steel wire rope have excellent flexibility and tensile strength, so that the drill bit fisher 8 can conveniently and quickly salvage the drill bit after sliding into the central hole of the drill bit under the action of gravity. In addition, the carbon fiber also has super-strong corrosion resistance, can effectively prevent the flexible connecting rope 2 from being corroded in field severe construction, prolongs the service life of the device, and reduces the salvage cost.
Preferably, as shown in fig. 1, the lower part of the drill bit fisher 8 is conical, so that the drill bit fisher 8 slides into the inclined drill bit central hole under the action of gravity, and the inverted tooth structure 7 of the drill bit fisher 8 is used for being clamped with the internal thread 9 of the central hole, so that the drill bit can be fished out timely and quickly, and the problem of the existing drill bit salvage is solved.
Preferably, as shown in fig. 1, an annular electromagnet 4 is arranged at the upper part of the drill bit fisher 8. After the drill bit fisher 8 is completely inserted into the central hole of the drill bit, the annular electromagnet 4 is started to generate a magnetic field, magnetic attraction is generated between the annular electromagnet 4 and the fallen drill bit 10, and under the combined action of the magnetic attraction and the clamping connection force (the internal thread clamping of the inverted tooth structure and the central hole), the connection force between the drill bit fisher 8 and the fallen drill bit 10 is increased, so that the drill bit is effectively prevented from slipping in the lifting process, and the fishing success rate is further improved. In addition, after the drill bit is fished out, the magnetic attraction force between the annular electromagnet 4 and the drill bit is eliminated by closing the switch of the annular electromagnet 4, so that the drill bit can be conveniently taken out of the drill bit fisher 8.
The invention is not limited to the above-mentioned best mode, any person can obtain other various products under the teaching of the invention, but any change in shape or structure is within the scope of protection of the invention, and all the technical schemes are the same or similar to the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (5)
1. A method of fishing a drill bit, comprising the steps of:
s1: when the drill bit falls off, slurry circulation in the hole is maintained, the bottom end of the drill rod is contacted with the fallen drill bit, whether the fallen drill bit is in the vertical direction is judged according to the actual penetration rule and the penetration rule when the drill bit falls off, and if the drill bit is not in the vertical direction, the S2 is carried out;
s2: detecting coordinates of a plurality of drill bit edge points through a drill rod, determining inclination angles of drill bits and coordinates of central holes, and turning to S3;
s3: firstly, according to the inclination angle of a drill bit, a drill bit fisher is obliquely arranged at the lower part of a drill rod of a drilling machine, then according to the center Kong Zuobiao of the drill bit, the drill bit fisher is inserted into a center hole of the drill bit, so that a inverted tooth structure of the drill bit fisher is clamped with an internal thread of the center hole of the drill bit, and finally, the drill rod is lifted by the drilling machine, and the fallen drill bit is taken out from the bottom of the hole;
s2, the specific flow for determining the inclination angle of the drill bit is as follows:
the drill rod is firstly used for downward detection by a drilling machine, and the coordinates of any three points at the edge of the drill bit are detected to be a (x) 1 ,y 1 ,z 1 )、b(x 2 ,y 2 ,z 2 ) And c (x) 3 ,y 3 ,z 3 ) The plane formed by the three points is the inclined plane of the drill bit;
and determining the normal vector (n) of the inclined plane according to the homogeneous linear equation 1 ,n 2 ,n 3 ) The method comprises the following steps:
finally, according to the inclination angle of the drill bit being equal to the included angle between the inclined surface and the horizontal plane, the inclination angle of the drill bit is as follows:
the device for fishing the drill bit in the method comprises a drill bit fisher (8) and a semi-flexible connecting device, wherein the lower part of the drill bit fisher (8) is conical, the middle part of the drill bit fisher (8) is a cylinder, the diameter of the cylinder is smaller than the inner diameter of a drill bit center hole, a convex inverted tooth structure (7) is arranged in the middle part of the drill bit fisher (8), the inverted tooth structure (7) comprises a plurality of spike parts which are inclined upwards, one end of the semi-flexible connecting device is detachably connected with the drill bit fisher (8), the other end of the semi-flexible connecting device is detachably connected with a drill rod (1) of a drilling machine, and the drill bit fisher (8) is obliquely arranged at the lower part of the drill rod.
2. A method of salvaging a drill bit as set forth in claim 1 wherein the specific procedure of determining the coordinates of the center hole of the drill bit in S2 is:
the drill rod is firstly used for downward detection by a drilling machine, and the coordinates of any five points at the edge of the drill bit are detected to be a (x) 1 ，y 1 ，z 1 )、b(x 2 ，y 2 ，z 2 )、c(x 3 ，y 3 ，z 3 )、d(x 4 ，y 4 ，z 4 ) And e (x) 5 ，y 5 ，z 5 )；
And then determining a general equation of the ellipse through a non-homogeneous linear equation according to the fact that the projection of the inclined surface of the drill bit on the horizontal plane is the ellipse: ax 2 +Bxy+Cy 2 +dx+ey+1=0, i.e.:
deriving a value for determining A, B, C, D and E;
finally, calculating the center hole plane coordinates O (x 0 ，y 0 ) The method comprises the following steps: x is x 0 ＝(2CD-BE)/(B 2 -4AC)，y 0 ＝(2AE-BD)/(B 2 -4 AC), calculating the coordinate z of the central hole of the drill bit in the vertical direction 0 The method comprises the following steps:
and thereby the center Kong Zuobiao (x) 0 ，y 0 ，z 0 )。/>
3. The method for fishing a drill bit according to claim 1, wherein the specific procedure for determining whether the dropped drill bit is in the vertical direction in S1 is as follows: and (3) at the center of the pile foundation hole in the original construction, the drill rod is downwards detected by the drilling machine, when the bottom end of the downwards detected drill rod is contacted with the fallen drill bit, if the actual downwards detected drill rod is larger than the drill rod when the drill bit falls off, the fallen drill bit is judged not to be in the vertical direction, and if the actual downwards detected drill rod is equal to the drill rod when the drill bit falls off, the fallen drill bit is judged to be in the vertical direction.
4. A method of fishing a drill bit as defined in claim 1, wherein S1 further comprises the steps of: if the drill bit is in the vertical direction, the drill bit fisher is rigidly connected with the drill rod of the drilling machine through the flange plate, the drill rod is then used for downward probing, the drill bit fisher is directly inserted into the center hole of the fallen drill bit, the inverted tooth structure of the drill bit fisher is clamped with the internal thread of the center hole, and finally the drill rod is lifted through the drilling machine, so that the fallen drill bit is taken out from the bottom of the hole.
5. A method of fishing a drill bit according to claim 1, wherein the vertical distance from the bottom end of the drill bit fisher mounted obliquely in S2 to the center line of the drill rod is equal to the vertical distance from the center hole of the drill bit to the center line of the pile hole.
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| CN109882107B true CN109882107B (en) | 2023-05-30 |
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