CN102392599A - Method for drilling by reverse circulation cutting - Google Patents
Method for drilling by reverse circulation cutting Download PDFInfo
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- CN102392599A CN102392599A CN2011103254044A CN201110325404A CN102392599A CN 102392599 A CN102392599 A CN 102392599A CN 2011103254044 A CN2011103254044 A CN 2011103254044A CN 201110325404 A CN201110325404 A CN 201110325404A CN 102392599 A CN102392599 A CN 102392599A
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- 238000000034 method Methods 0.000 title claims abstract description 188
- 238000005520 cutting process Methods 0.000 title claims abstract description 98
- 238000005553 drilling Methods 0.000 title claims abstract description 64
- 239000011435 rock Substances 0.000 claims abstract description 81
- 239000002893 slag Substances 0.000 claims description 65
- 238000003825 pressing Methods 0.000 claims description 27
- 239000002002 slurry Substances 0.000 claims description 25
- 230000006835 compression Effects 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 241001391944 Commicarpus scandens Species 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 14
- 238000007599 discharging Methods 0.000 description 14
- 230000000903 blocking effect Effects 0.000 description 5
- 230000036346 tooth eruption Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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Abstract
The invention relates to a method for drilling by reverse circulation cutting, comprising a reverse circulation circular cutting drilling process composed of circular cutting drilling process and reverse circulation slagging process, a reverse circulation centripetal feeding rotation drilling process composed of centripetal feeding rotation drilling process and the reverse circulation slagging process, and a rotary grasping drill coring slagging process; the method is as follows: firstly applying reverse circulation circular cutting drilling process for drilling, stopping feeding downward after drilling the annular slot of the rotary drilling depth along the hole wall; then applying the reverse circulation centripetal feeding rotation drilling process to cut the rock core pole surrounded by the annular slot, after breaking the rock core pole, applying the rotary grasping drill coring slagging process to take out the rock core pole from the hole. The invention has the advantage of overcoming the disadvantages of local air reverse circulation circular cutting coring drilling process that the wall is easy to break and the cost is high, which solves the difficult and hot problems that the drilling in the rock layer is slow and the cost is high.
Description
Technical Field
The invention mainly relates to the technical field of pile hole construction of drilled piles, in particular to a reverse circulation cutting hole forming method.
Background
The pile hole construction drill is one of engineering construction drills, and has the same meaning as a pile hole construction technology and a pile hole construction method.
The pile hole construction drill is composed of a hole forming device, one or more types of hole forming methods and hole forming processes thereof, and the hole forming device of the pile hole construction drill can respectively realize the hole forming processes belonging to various hole forming methods without dismounting (not including lengthening) a drill rod or a rigid slag discharge pipe in the hole forming process.
In the process of pore-forming, the pore-forming equipment can respectively realize various pore-forming methods by disassembling and assembling a drill rod or a rigid slag discharge pipe, and is multifunctional pore-forming equipment.
The drilling method and the slag removing method of the pore-forming method can work in a combined way without disassembling and assembling a drill rod or a rigid slag removing pipe (not including lengthening) in the pore-forming process.
The drilling method consists of one or more drilling methods, and various drilling methods in one drilling method can be combined to operate without disassembling a drill rod or a rigid slag discharge pipe (not including lengthening) in the drilling process.
The method for removing the slag comprises one or more slag removing methods, and various slag removing methods in one slag removing method can be operated in a combined way without disassembling and assembling drill rods or rigid slag removing pipes (not including lengthening) in the slag removing process.
The drilling process and the slag removing process of the pore-forming process can carry out pore-forming operation without disassembling a drill rod or a rigid slag removing pipe (not including lengthening) in the pore-forming process.
The drilling process consists of one or more drilling processes, and various drilling processes in one drilling process can carry out drilling operation without disassembling a drill rod or a rigid slag discharge pipe (not including lengthening) in the drilling process.
The deslagging process consists of one or more deslagging processes, and various deslagging processes in the deslagging process can carry out deslagging operation without disassembling a drill rod or a rigid deslagging pipe (not including lengthening).
The drilling method can be divided into horizontal and vertical drilling methods according to the nature and mode of the applied external force; the method of removing slag can be divided into slurry and carrying method according to whether slurry is involved in removing slag. The various drilling methods and slag removal methods are shown in Table 3.
Two drilling methods and two slag removal methods may constitute 9 types of hole forming methods. The various pore-forming methods are shown in Table 2.
The 9 types of hole forming methods can form 9 types of pile hole construction drills. The construction of various pile holes is shown in table 1.
The advancement, applicability and economy of the pile hole construction drill depend on the diversity of the types of hole forming methods.
Rock is a brittle solid characterized by brittleness and robustness. The hole forming process of volume crushing of the rock drilling body is not carried out, and the method is suitable for the characteristics of rock stratums; the pore-forming process of volume crushing of the rock-drilled body is not suitable for the characteristics of rock strata.
200410013230.8 patent, it is an IX type pile hole construction drill, in the course of hole forming, its hole forming equipment can respectively implement 12 kinds of hole forming processes belonging to 9 kinds of hole forming methods without dismounting drill rod. Wherein,
the mud circulation blasting rotary grab bucket pore-forming process for forming pores in rock stratum is a pore-forming process for breaking the volume of rock-drilled body, so that it is not suitable for the characteristics of rock stratum.
In the research on the multi-process rotary drilling technology (Liu Sanyi, full-text database of the Chinese doctor academic thesis), there is a local air reverse circulation circular cutting coring and hole forming process.
The local air reverse circulation circular cutting coring and pore-forming process is composed of circular cutting drilling process, core-breaking drilling process of a blocking device, local air reverse circulation slag-removing process, core-breaking drilling process of the blocking device and drill bit slag-removing process, and is composed of circular cutting drilling process and local air reverse circulation slag-removing process.
The hole forming process of the local air reverse circulation circular cutting coring hole forming process comprises the following steps: the method comprises the steps of firstly, forming holes by using a local air reverse circulation circular cutting hole forming process, stopping drilling after drilling a circular groove along the hole wall reaching the drilling depth of the next time, then, blocking a core column surrounded by the circular groove by using a core breaking drilling process of a blocking device, and taking out the core column from the hole by using a core taking and mucking process of the blocking device after the core column is blocked.
The hole forming process of the local air reverse circulation circular cutting hole forming process comprises the following steps: when the teeth of the cone palm of the cylindrical drill bit rotate back along the bottom surface of the circular hole of the hole wall to break rock downwards, the air compressor sends compressed air into the slag discharging pipe of the drill bit through the air tap on the ground-type gyrator, the high-pressure rubber pipe and the air inlet pipe of the drill bit, the compressed air is mixed with mud in the slag discharging pipe to generate an air-water mixture, the air-water mixture quickly rises in the slag discharging pipe to drive the mud in the slag discharging pipe to flow out of the slag discharging pipe from bottom to top at a high speed, negative pressure and huge suction force are formed at the lower inlet of the slag discharging pipe, the rock slag at the bottom of the hole is sucked away from the bottom of the hole by the suction force and is discharged through the slag discharging pipe, and the discharged rock slag returns back to the pile hole and then slows down in rising speed due to the increase of the flow area and finally deposits.
The drilling process of the core breaking drilling process of the snap-off device comprises the following steps: the drill bit is lifted, the breaking device of the drill bit is influenced by self gravity or spring force, the breaking device extends from the cylinder wall of the cylindrical drill bit to the hole center and is clamped on the core pillar, and the core pillar is broken through powerful lifting and vibration.
The slag removing process of the core taking and drill bit slag removing process of the snap breaker comprises the following steps: and lifting the drill bit to leave the hole, temporarily storing rock ballast in the rock ballast storage hopper and discharging the rock ballast and the rock core column clamped by the clamping device along with the drill bit to leave the hole.
The hole forming by the local air reverse circulation circular cutting core hole forming process can meet the following 3 conditions:
the cracks of the rock-drilled body are developed, the rock stratum is incomplete, and the rock core column can be twisted off without a cutter in the process of drilling the circular groove;
the rock body crack does not develop, the rock stratum is complete, but the diameter of the core column is smaller, and the core column can be broken by the breaker;
the rock body crack does not develop, the rock stratum is complete and the diameter of the core column is large, and the core column cannot be broken by the breaking device.
The pore-forming process for the latter case is: after the circular groove along the hole wall reaching the depth of drilling again is drilled by using a local air reverse circulation circular cutting hole-forming process, the rock core column is firstly broken by using a short spiral drill bit, and then rock ballast in a discharge hole is discharged by using a ballast scooping bucket.
As mentioned above, the applicability of the local air reverse circulation circular cutting coring pore-forming process is as follows:
the method is suitable for making pile holes in rocks with developed rock fractures and incomplete rock stratums;
the method is suitable for manufacturing the small-diameter pile hole in the rock with undeveloped rock mass crack and complete rock stratum;
is not suitable for manufacturing large-diameter pile holes in rocks with undeveloped rock fractures and complete rock stratums.
The local air reverse circulation circular cutting core-taking pore-forming process is not practical at present because the pore-forming equipment is not suitable for the pore-forming process.
In field tests, research units find two problems of contradiction between the reasons of the local air reverse circulation circular cutting drilling process, namely:
the repeated crushing of rock slag is high, and the hole forming speed is low, because the air exhaust amount and the air pressure are too small, the upward return speed of mud at the bottom of a hole is not enough to bring large-particle rock slag away from the drilling surface;
the wall is easy to collapse on the covering layer because the air exhaust amount and the air pressure are too large, when a large amount of compressed air rapidly rises in the hole, the mud pressure is rapidly reduced, and the air is rapidly expanded, so that the mud is severely disturbed to cause wall collapse.
The research unit considers that: the purpose of adopting the local air reverse circulation rotary drilling hole forming process is to obtain higher hole forming speed, and the air pressure and the air exhaust volume must meet the requirements of slag discharge and hole bottom cleaning to achieve the purpose.
The solution proposed by the research unit is: the air exhaust amount and air pressure are increased by protecting the wall from the hole opening to the rock surface by a protective cylinder.
The research unit considers the problem of implementing the solution to be: the cost of the casing wall protection from the orifice to the rock surface is too high, and the casing wall protection can not be popularized and used in China at present.
In the technical field of pile hole construction, except a local air reverse circulation circular cutting coring hole forming process, other hole forming processes which do not carry out volume crushing on a rock drilling body are not available.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a reverse circulation cutting hole forming method is provided to improve the adaptability of the pile hole construction drill disclosed in the invention 200410013230.8 patent to rock strata.
The technical scheme adopted by the invention to solve the technical problem is as follows:
the invention provides a reverse circulation cutting pore-forming method, which comprises the following steps: the drilling machine comprises a reverse circulation circular cutting hole forming process consisting of a circular cutting drilling process and a reverse circulation slag discharging process, a reverse circulation centripetal feeding rotary hole forming process consisting of a centripetal feeding rotary drilling process and a reverse circulation slag discharging process, and a rotary grab bit coring and slag discharging process. The method comprises the following steps: the method comprises the steps of firstly, forming holes by using a reverse circulation circular cutting hole forming process, stopping feeding downwards after drilling a circular groove along the hole wall reaching the depth of repeated drilling, then cutting a core column surrounded by the circular groove by using a reverse circulation centripetal feeding rotary hole forming process, and taking out the core column from the hole by using a rotary grab bit coring and mucking process after the core column is broken.
In the pore-forming process by the reverse circulation ring cutting pore-forming process, the method comprises the following steps: when teeth of cone palm of the circular cutting cylinder turn back along the bottom surface of the circular ring-shaped hole of the hole wall to break rock downwards, slurry carrying rock debris enters the pipeline from the bottom surface of the circular ring-shaped groove of the hole wall and then flows to the ground.
The slurry carrying the rock slag enters the pipeline from the bottom surface of the circular groove along the hole wall and flows to the ground through a slag discharge pipe of the drill bit, a water tap and a cavity of the sealed telescopic drill rod, after the slurry and the rock slag exit, the rock slag is deposited on the ground, and the slurry flows back to the inlet hole.
In the cutting process, the method comprises the following steps: under the combined action of centripetal feeding force and rotary moment, the cutting tool rotates towards the hole center to cut the core column, and the cut rock slag is carried out by mud which continuously flows in a reverse circulation manner inside and outside the hole.
In the process of coring and deslagging by the rotary grab drill bit, the method comprises the following steps: after the rock core column is broken, the cutting tool supports the rock core column at the section under the action of the clamping force, then the drill bit outlet is lifted, and the rock core column is detached after the drill bit is separated from the outlet.
The method provided by the invention is realized by a reverse circulation cutting drill bit, the drill bit consists of a drill bit seat, a double-connecting-rod valve leaf opening and closing mechanism, a circular cutting cylinder, a centripetal cutting valve leaf and a slag discharge pipeline, wherein: the double-connecting-rod valve leaflet opening and closing mechanism is provided with a pulling and pressing connecting rod, an upper opening and closing connecting rod and a lower opening and closing connecting rod, one end of the pulling and pressing connecting rod is hinged through a hinge shaft, the other end of the pulling and pressing connecting rod is hinged with a pulling and pressing device, the other end of the upper opening and closing connecting rod is hinged with a drill bit seat, and the other end of the lower opening and closing connecting rod is hinged with a centripetal cutting valve leaflet; the lower end of the centripetal cutting valve leaf is distributed with centripetal teeth which rotate to cut and break rocks towards the hole center.
The working process of the double-connecting-rod valve leaf opening and closing mechanism is as follows: the pulling and pressing device pushes down the pulling and pressing connecting rod to open the centripetal cutting valve leaflets, and the pulling and pressing device pulls up the pulling and pressing connecting rod to close the centripetal cutting valve leaflets.
The other end of the upper opening-closing connecting rod is hinged with a central pipe of the drill bit seat.
The other end of the lower opening and closing connecting rod is hinged with a lower connecting rod seat on the centripetal cutting valve leaf.
The other end of the tension and compression connecting rod is hinged with the bottom surface of a lower turntable of the tension and compression device.
Compared with the local air reverse circulation circular cutting coring and pore forming method, the invention has the following main advantages: the slurry flowing at high speed in the pipeline does not disturb the hole wall, and a protective cylinder is not needed to protect the wall from the hole opening to the rock face, so that the defects that the hole forming process of local air reverse circulation circular cutting coring is easy to break the wall or has high cost are overcome, the hole forming process which does not crush the volume of the rock body to be drilled has practicability, and the difficult point and the hot point problems of slow hole forming and high cost in the rock stratum are solved.
Drawings
FIG. 1 is a schematic representation of the construction of a reverse circulation cutting bit for use with the present invention.
Fig. 2 is a schematic structural diagram of the pull-press device.
In the figure: 1. a drill bit center tube; 2. an upper connecting rod seat; 3. pulling and pressing the connecting rod; 4. an upper opening and closing connecting rod; 5. an upper slag discharge pipe; 6. a guide ring disk; 7. a lower opening and closing connecting rod; 8. a flap hinge seat; 9. a lower connecting rod seat; 10. circularly cutting the cylinder; 11. centripetally cutting the valve leaves; 12. a lower slag discharge pipe; 13. a cone leg; 14. a centripetal tooth; 15. cutting teeth circularly; 16. a main housing; 17. an orientation cylinder; 18. an opening and closing oil cylinder; 19. a main machine central tube; 20. a center tube of the drawer; 21. a lifting cylinder; 22. an upper turntable; 23. not rotating the disc; 24. a lower turntable.
Detailed Description
The following detailed description of the embodiments of the invention is provided in connection with the accompanying drawings.
The invention solves the problems of easy wall collapse or high cost of the local air reverse circulation circular cutting coring pore-forming process, and solves the difficult and hot problems of slow pore-forming and high cost in the rock stratum.
The hole bottom type pore-forming equipment provided with the sealed telescopic drill rod uses a reverse circulation cutting drill bit to realize a reverse circulation cutting pore-forming process.
The invention provides a reverse circulation cutting pore-forming method, which comprises the following steps: the drilling machine comprises a reverse circulation circular cutting hole forming process consisting of a circular cutting drilling process and a reverse circulation slag discharging process, a reverse circulation centripetal feeding rotary hole forming process consisting of a centripetal feeding rotary drilling process and a reverse circulation slag discharging process, and a rotary grab bit coring and slag discharging process. The method comprises the following steps: the method comprises the steps of firstly, forming holes by using a reverse circulation circular cutting hole forming process, stopping feeding downwards after drilling a circular groove along the hole wall reaching the depth of repeated drilling, then cutting a core column surrounded by the circular groove by using a reverse circulation centripetal feeding rotary hole forming process, and taking out the core column from the hole by using a rotary grab bit coring and mucking process after the core column is broken.
The hole forming process of the reverse circulation circular cutting hole forming process comprises the following steps: when teeth of a cone palm of the circular cutting cylinder turn back along the bottom surface of a circular hole of the hole wall to break the rock, slurry carrying rock debris enters a pipeline from the bottom surface of a circular groove of the hole wall and flows to the ground through a slag discharge pipe of a drill bit, a water tap and a cavity of a sealed telescopic drill rod, the rock debris is precipitated on the ground after the slurry and the rock debris exit, and the slurry flows back to the inlet hole.
The deslagging process of the reverse circulation circular cutting hole forming process is as follows: and after the slurry and the rock slag are discharged from the hole, the rock slag is deposited on the ground, and the slurry flows back to the inlet hole.
The forming process of the reverse circulation centripetal feeding rotary pore-forming process comprises the following steps: under the combined action of feeding force and rotary moment, the cutting tool rotates towards the hole core tooth to cut the rock core column, and the cut rock slag is carried out to the hole by the slurry which continuously flows in a reverse circulation mode inside and outside the hole.
The drilling process of the reverse circulation centripetal feeding rotary hole forming process is as follows: under the combined action of the feeding force and the rotary moment, the cutting tool rotates towards the hole center tooth to cut the rock core column.
The slag removal process of the rotary grabbing drill bit coring and slag removal process comprises the following steps: after the core column is broken, under the action of clamping force of valve leaf, the centripetal tooth supports the core column at the cross section, then the drill bit outlet is lifted, and the rock slag and core column are removed after the drill bit is separated from the outlet.
The rock holding mode of the rotary grabbing drill bit coring and slag removal process is as follows: under the action of the clamping force, the cutting tool supports the rock core column at the section.
The method provided by the invention is realized by using the reverse circulation cutting drill bit shown in figure 1, the drill bit consists of a drill bit seat, a double-connecting-rod valve leaflet opening and closing mechanism, a circular cutting cylinder, a centripetal cutting valve leaflet and a slag discharge pipeline, wherein: the double-connecting-rod valve leaflet opening and closing mechanism is provided with a pulling and pressing connecting rod 3, an upper opening and closing connecting rod 4 and a lower opening and closing connecting rod 7, one end of the pulling and pressing connecting rod 3 is hinged through a hinge shaft, the other end of the pulling and pressing connecting rod 3 is hinged with a pulling and pressing device, the other end of the upper opening and closing connecting rod 4 is hinged and connected with a drill bit seat, and the other end of the lower opening and closing connecting rod 7 is hinged and connected with a; the lower end of the centripetal cutting valve leaf 11 is distributed with centripetal teeth 14 which rotate towards the hole center to cut and break rocks.
The double-connecting-rod valve leaflet opening and closing mechanism is characterized in that the valve leaflets are opened by the opening and closing connecting rods when the pulling and pressing connecting rods are lowered, and the valve leaflets are closed by the opening and closing connecting rods when the pulling and pressing connecting rods are lifted.
The centripetal cutting valve leaflet is provided with centripetal teeth 14 which are arranged at the lower end of the valve leaflet 11 and rotate to cut and break rocks towards the hole center.
FIG. 1 is a schematic diagram of a reverse circulation cutting bit.
The drill bit seat is formed by fixedly connecting a central pipe 1 and a guide ring disc 6.
The double-connecting-rod valve leaf opening and closing mechanism consists of an upper opening and closing connecting rod 4, a lower opening and closing connecting rod 7 and a pulling and pressing connecting rod 2.
The upper end of the upper opening and closing connecting rod is hinged with an upper connecting rod seat 2 on the central pipe, the lower end of the lower opening and closing connecting rod is hinged with a lower connecting rod seat 9 on the valve leaf, and the lower end of the pulling and pressing connecting rod is hinged with the lower end of the upper opening and closing connecting rod and the upper end of the lower opening and closing connecting rod.
The top surface of the circular cutting cylinder 10 is connected with the bottom surface of the guide ring disc 6, and a cone palm 13 and circular cutting teeth 15 are distributed on the bottom surface of the circular cutting cylinder.
The lower end of a valve leaflet 11 for cutting the valve leaflet centripetally is distributed with centripetal teeth 14, the valve leaflet is hinged with a guide ring disc through a valve hinge seat 8, and the valve leaflet is also hinged with the lower end of an opening connecting rod under a lower connecting rod seat 9.
The slag removing pipeline of the drill bit consists of a central pipe 1, an upper slag removing pipe 5 and a lower slag removing pipe 12.
Fig. 2 is a schematic structural diagram of the pull-press device.
Wherein:
the directional cylinder 17 is connected with the main machine shell 16, the upper part of a center tube 20 of the pressure pulling device is connected with a center tube 19 of the main machine, the lower part of the center tube of the pressure pulling device is connected with a center tube 1 of the drill bit, the upper part of an opening and closing oil cylinder 18 is connected with the main machine shell 16, and the lower part of the opening and closing oil cylinder is connected with;
the lifting cylinder 21 is sleeved outside the directional cylinder 17 through keys and grooves, and the lower end of the lifting cylinder 21 is connected with the non-rotating disc 23;
the non-rotating disc 23, which is the supporting disc of the upper and lower rotating discs, is between the upper rotating disc 22 and the lower rotating disc 24;
the upper turntable 22 and the lower turntable 24 are sleeved outside the main machine central pipe 19 through keys and grooves and can rotate along with the main machine central pipe;
the upper end of the tension and compression connecting rod 3 is hinged with the bottom surface of the lower turntable 24, and the lower end is hinged with the upper opening and closing connecting rod 3 and the lower opening and closing connecting rod 7.
The method provided by the invention comprises the following pore-forming process:
the host drives the opening and closing oil cylinder 18 to move out of the piston, the lifting cylinder 21, the upper rotary disc 22, the non-rotary disc 23, the lower rotary disc 24 and the pulling and pressing connecting rod 3 are pushed to move downwards, the upper opening and closing connecting rod 3 rotates downwards around the upper connecting rod seat 2 and the lower opening and closing connecting rod 7 around the lower connecting rod seat 9 simultaneously under the pressure action of the pulling and pressing connecting rod, the linear distance between the upper connecting rod seat 2 and the lower connecting rod seat 9 is gradually shortened along with the rotation of the upper opening and closing connecting rod and the lower connecting rod seat 8, the valve leaf 11 gradually opens around the valve hinge seat 8, and the outer wall of the valve leaf 11 is drilled downwards after being.
After the drill bit is bottomed, the main machine drive, the main machine central tube 19 and the pressure pulling device central tube 20 are carried out; an upper turntable 22; the lower rotary table 24, the tension and compression connecting rod 3 and the reverse circulation cutting drill bit rotate, and meanwhile, a sand pump on the ground sequentially passes through the hole-entering rubber tube, the cavity of the sealed telescopic drill rod, the water faucet, the main machine central tube, the tension and compression device central tube, the drill bit central tube, the upper ballast discharge tube and the lower ballast discharge tube, sucks slurry from the bottom of the circular hole along the hole wall to the outside of the hole and replenishes the slurry from the hole opening to the inside of the hole.
Downward feeding, rotating and crushing rock along the hole wall by the circular cutting teeth and teeth of the cone palm, and carrying out hole drilling by the slurry which continuously flows in a reverse circulation manner. In the process of forming the hole along the hole wall, the valve blades and the annular cutting barrel move downwards along with the annular cutting teeth and teeth of the cone palm, when the depth of the movement is equal to the height of the valve blades, the downward feeding is stopped, the oil cylinder piston is retracted, the valve blades are folded towards the hole center to provide centripetal feeding force for the centripetal teeth, the drill core column is cut towards the hole center by the centripetal teeth under the combined action of the centripetal feeding force and the rotary moment, and the cutting process is finished when the drill core column is twisted off.
And after the cut core column is twisted off, stopping rotating the drill bit and flowing slurry, lifting the drill bit outlet hole, opening the valve leaf to remove the core column, and then lowering the drill bit to perform the next pore-forming operation.
According to the specific implementation mode, the hole is formed by using a reverse circulation cutting hole forming process, and the slurry supplemented into the hole from the hole opening flows through the formed hole section, but has no great influence on the stability of the hole wall due to large flow area and low slurry flow rate; although the flow rate of the slurry flowing out of the hole from the bottom of the hole to the outside of the hole is high, the slurry flows out of the hole through the pipeline and flows into the pipeline in the rock hole section, and the stability of the hole wall is not greatly influenced. Therefore, no casing is required to protect the wall from the opening to the rock face.
Attached watch
Claims (10)
1. The reverse circulation cutting pore-forming method comprises a reverse circulation circular cutting pore-forming process consisting of a circular cutting drilling process and a reverse circulation slag removing process, a reverse circulation centripetal feeding rotary pore-forming process consisting of a centripetal feeding rotary drilling process and a reverse circulation slag removing process, and a rotary grab drill bit coring and slag removing process, and is characterized in that: the method comprises the steps of firstly, forming holes by using a reverse circulation circular cutting hole forming process, stopping feeding downwards after drilling a circular groove along the hole wall reaching the depth of repeated drilling, then cutting a core column surrounded by the circular groove by using a reverse circulation centripetal feeding rotary hole forming process, and taking out the core column from the hole by using a rotary grab bit coring and mucking process after the core column is broken.
2. The reverse circulation cutting pore-forming method as claimed in claim 1, wherein in the pore-forming process, the method comprises the following steps: when teeth of cone palm of the circular cutting cylinder turn back along the bottom surface of the circular ring-shaped hole of the hole wall to break rock downwards, slurry carrying rock debris enters the pipeline from the bottom surface of the circular ring-shaped groove of the hole wall and then flows to the ground.
3. The reverse circulation cutting pore-forming method as claimed in claim 2, wherein: slurry carrying rock debris enters the pipeline from the bottom surface of the circular groove along the hole wall and flows to the ground through a slag discharge pipe of the drill bit, a water tap and a cavity of the sealed telescopic drill rod, after the slurry and the rock debris exit holes, the rock debris is deposited on the ground, and the slurry flows back to the inlet hole.
4. The reverse circulation cutting pore-forming method as claimed in claim 1, wherein during the cutting process, the method comprises: under the combined action of centripetal feeding force and rotary moment, the cutting tool rotates towards the hole center to cut the core column, and the cut rock slag is carried out by mud which continuously flows in a reverse circulation manner inside and outside the hole.
5. The reverse circulation cutting and hole forming method as claimed in claim 1, wherein during the core taking and slag removing process of the rotary grabbing drill bit, the method comprises the following steps: after the rock core column is broken, the cutting tool supports the rock core column at the section under the action of the clamping force, then the drill bit outlet is lifted, and the rock core column is detached after the drill bit is separated from the outlet.
6. The method for forming the hole by reverse circulation cutting is characterized in that a reverse circulation cutting drill bit is used in the method, the drill bit consists of a drill bit seat, a double-connecting-rod valve leaflet opening and closing mechanism, a circular cutting cylinder, a centripetal cutting valve leaflet (11) and a slag discharge pipeline, wherein: the double-connecting-rod valve leaflet opening and closing mechanism is provided with a pulling and pressing connecting rod (3), an upper opening and closing connecting rod (4) and a lower opening and closing connecting rod (7), one end of the pulling and pressing connecting rod (3) is hinged through a hinge shaft, the other end of the pulling and pressing connecting rod (3) is hinged with a pulling and pressing device, the other end of the upper opening and closing connecting rod (4) is hinged with a drill bit seat, and the other end of the lower opening and closing connecting rod (7) is hinged with a centripetal cutting valve leaflet (; the lower end of the centripetal cutting valve leaf (11) is distributed with centripetal teeth (14) which rotate to the hole center to cut and break rocks.
7. The reverse-loop pore-forming cutting method according to claim 6, wherein the operation process of the dual-link leaflet opening and closing mechanism is as follows: the pulling and pressing device presses the pulling and pressing connecting rod (3) downwards to open the centripetal cutting valve blades (11), and the pulling and pressing device pulls the pulling and pressing connecting rod (3) to close the centripetal cutting valve blades (11).
8. The reverse circulation cutting hole forming method as claimed in claim 6, wherein: the other end of the upper opening and closing connecting rod (4) is hinged with a central pipe of the drill bit seat.
9. The reverse circulation cutting hole forming method as claimed in claim 6, wherein: the other end of the lower opening and closing connecting rod is hinged with a lower connecting rod seat (9) on the centripetal cutting valve leaf (11).
10. The reverse circulation cutting hole forming method as claimed in claim 6, wherein: the other end of the tension and compression connecting rod (3) is hinged with the bottom surface of a lower turntable (24) of the tension and compression device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103254044A CN102392599A (en) | 2011-10-24 | 2011-10-24 | Method for drilling by reverse circulation cutting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103254044A CN102392599A (en) | 2011-10-24 | 2011-10-24 | Method for drilling by reverse circulation cutting |
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| CN102392599A true CN102392599A (en) | 2012-03-28 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678049A (en) * | 2012-04-24 | 2012-09-19 | 北京市三一重机有限公司 | Circular cutting drill bit, rotary drilling machine and rock drilling method adopting static blasting |
| CN103726801A (en) * | 2013-12-26 | 2014-04-16 | 北京市三一重机有限公司 | Deslagging device and rotary drilling rig |
| CN104763324A (en) * | 2015-04-01 | 2015-07-08 | 上海强劲地基工程股份有限公司 | Large-diameter hole forming construction equipment for core drilling rock entering and construction method thereof |
| CN106089030A (en) * | 2016-08-12 | 2016-11-09 | 叶晓明 | Parallel-moving type rock drilling hole forming machine and forming hole method |
| CN113266271A (en) * | 2021-07-20 | 2021-08-17 | 山东辛丁技术有限公司 | Automatic drilling machine for sampling sludge stratum and drilling method |
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2011
- 2011-10-24 CN CN2011103254044A patent/CN102392599A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678049A (en) * | 2012-04-24 | 2012-09-19 | 北京市三一重机有限公司 | Circular cutting drill bit, rotary drilling machine and rock drilling method adopting static blasting |
| CN102678049B (en) * | 2012-04-24 | 2015-02-18 | 北京市三一重机有限公司 | Circular cutting drill bit, rotary drilling machine and rock drilling method adopting static blasting |
| CN103726801A (en) * | 2013-12-26 | 2014-04-16 | 北京市三一重机有限公司 | Deslagging device and rotary drilling rig |
| CN103726801B (en) * | 2013-12-26 | 2016-05-25 | 北京市三一重机有限公司 | Slag-draining device and rotary drilling rig |
| CN104763324A (en) * | 2015-04-01 | 2015-07-08 | 上海强劲地基工程股份有限公司 | Large-diameter hole forming construction equipment for core drilling rock entering and construction method thereof |
| CN106089030A (en) * | 2016-08-12 | 2016-11-09 | 叶晓明 | Parallel-moving type rock drilling hole forming machine and forming hole method |
| CN106089030B (en) * | 2016-08-12 | 2018-08-07 | 叶晓明 | Parallel-moving type rock drilling hole forming machine and forming hole method |
| CN113266271A (en) * | 2021-07-20 | 2021-08-17 | 山东辛丁技术有限公司 | Automatic drilling machine for sampling sludge stratum and drilling method |
| CN113266271B (en) * | 2021-07-20 | 2021-09-17 | 山东辛丁技术有限公司 | Automatic drilling machine for sampling sludge stratum and drilling method |
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