CN112878900A - Drilling tool for penetrating gravel stratum - Google Patents
Drilling tool for penetrating gravel stratum Download PDFInfo
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- CN112878900A CN112878900A CN202110068764.4A CN202110068764A CN112878900A CN 112878900 A CN112878900 A CN 112878900A CN 202110068764 A CN202110068764 A CN 202110068764A CN 112878900 A CN112878900 A CN 112878900A
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- gravel
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- 238000005553 drilling Methods 0.000 title claims abstract description 87
- 230000000149 penetrating effect Effects 0.000 title claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 13
- 239000010881 fly ash Substances 0.000 claims abstract description 6
- 239000004575 stone Substances 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 20
- 239000002002 slurry Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 230000007704 transition Effects 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000000717 retained effect Effects 0.000 abstract description 2
- 238000009792 diffusion process Methods 0.000 description 4
- 239000011435 rock Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 235000010469 Glycine max Nutrition 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B12/00—Accessories for drilling tools
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B15/00—Supports for the drilling machine, e.g. derricks or masts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
For the technical problem that the drill bit is easy to fall off when penetrating through a gravel stratum, the invention provides the technical idea of arranging the wall protecting section type isolating device, wherein the gravel stratum is isolated from the inside of a drill hole through the wall protecting section, and the drill bit is protected from continuously drilling downwards. Furthermore, the invention designs a pluggable drilling tool with a wall protection section, so that the wall protection section is retained when the drilling tool drills into a gravel stratum, and the power section is carried to the outside, and the power section can be recycled. The retaining wall section is provided with a drilling part to enable the retaining wall section to have drilling capacity, when the retaining wall section is drilled into a gravel stratum filled with fly ash/cement, a gravel filling body can enter the retaining wall section, so that an internal drilling system comprising an inner drill rod, a wing-shaped blade and a stepped drill bit is arranged, a gravel filling body in the retaining wall section can be crushed, and the size of the retaining wall section is far larger than that of a traditional drill bit, so that the drill drop phenomenon cannot occur.
Description
Technical Field
The invention belongs to the field of municipal construction, and relates to a drilling tool for penetrating a gravel stratum.
Background
Municipal works generally refer to the arrangement of various buildings and structures in the planned construction range of urban areas, and the necessary condition is to ensure the stability of the foundation during construction. The foundation refers to the soil or rock mass supported under the building, and the foundation does not belong to the building component, but has very important function for ensuring the firmness and durability of the building. The foundation has enough bearing capacity, the settlement of the foundation needs to be controlled within a certain range, and the foundation has the capability of preventing overturning and instability, so the foundation needs to be reinforced before ground building construction.
The gravel stratum under the foundation is always the key area for foundation reinforcement, and generally, the gravel stratum is reinforced by injecting filling materials, such as fly ash and cement paste, into the gravel stratum through ground drilling. However, when two gravel strata are encountered, the drilling tool needs to penetrate through the upper gravel stratum to reinforce the lower gravel stratum, and the drilling tool is easy to embrace the drill when penetrating through the gravel stratum, so that the drill cannot be lifted, and the drilled hole is scrapped, so that the drilling tool capable of penetrating through the gravel stratum is urgently needed to solve the problem of reinforcing the two gravel strata.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a drilling method for penetrating a gravel stratum, which comprises the following construction steps: s1, in the foundation stabilization area, connecting a drill rod by using a conventional drill bit, and constructing a plurality of drill holes from the ground to the gravel stratum;
preferably, the bore diameter is smaller than the outer diameter of the wall protection cylinder;
s2, when drilling into the upper gravel stratum, lifting the drill, grouting, and injecting slurry which is fly ash slurry; installing a wellhead device at the orifice, wherein the wellhead device adopts a four-way structure, the upper way is connected with a pressure gauge, the lower way is connected with a drill hole, one of two horizontal ways is connected with a grouting pipeline, and the other way is connected with a water injection pipeline; firstly, injecting water to wash out a gap between the pipeline and the gravels in the upper gravel stratum, then grouting, and then alternately pumping grouting body and clear water;
preferably, an injection scheme of normal-pressure grouting and high-pressure water injection is adopted.
S3, drilling along the original drilled hole by adopting a gravel-penetrating drilling tool after grouting, wherein the gravel-penetrating drilling tool comprises a power section and a wall protection section which are coaxially arranged, the power section comprises a drill rod connecting section, a horn-shaped transition section and an upper connecting section from top to bottom, the wall protection section comprises a lower connecting part, a wall protection barrel and a plurality of drilling parts from top to bottom, and the upper connecting section is connected with the lower connecting part in a pluggable manner through the upper connecting part at the lower end of the upper connecting section; connecting the upper part of the drill rod connecting section with a drill rod, and cutting crushed stone and a filling body in the upper crushed stone stratum by a drilling part until the crushed stone and the filling body are drilled into a bottom plate of the upper crushed stone stratum at a certain depth, wherein the top end of the wall protecting section is positioned in a complete top plate of the upper crushed stone stratum within a certain range;
meanwhile, an internal drilling system also works, wherein the internal drilling system is characterized in that a support frame is horizontally arranged in the transition section, a driving motor is fixed on the support frame, an output shaft of the driving motor is connected with an inner drill rod, the upper part of the inner drill rod is provided with a plurality of layers of wing-shaped blades, more than 2 wing-shaped blades are uniformly arranged on each layer, and the bottom of the inner drill rod is connected with a stepped drill bit; starting a driving motor to drive the inner drill rod to rotate so as to drive the stepped drill bit and the wing-shaped blade to cut broken stones in the drilling tool;
preferably, the whole drilling process is carried out by pumping slurry flushing fluid from the interior of the drill pipe;
preferably, the diameter of the upper connecting section is larger than that of the drill rod connecting section, the drilling parts are circumferentially spaced and uniformly arranged along the wall protection cylinder, and the bottom end of the stepped drill bit is higher than that of the wall protection section.
S4, lifting the drill, wherein the power section is lifted to the ground along with the drill rod, and the lower wall protecting section is left in the upper gravel stratum to isolate the upper gravel stratum from the inner space of the drill hole;
s5, connecting the drill rod with a conventional drill bit, and continuing drilling along the original drill hole, wherein the drill bit penetrates through the upper gravel layer from the interior of the drill bit under the protection of the wall protecting section;
s6, drilling continuously, when drilling to the lower gravel stratum, lifting the drill, then grouting, the grouting method is the same as the step S2;
and S7, after grouting, sealing holes with cement paste to a certain distance from the ground surface, then placing a reinforcement cage, and continuously pouring cement paste to form a reinforced cement pile for reinforcing the shallow foundation.
Preferably, a device for fixing the inner drill rod is arranged in the upper connecting section, the device comprises a bearing coaxially fixed on the inner drill rod, a fixed block fixed on the inner wall of the upper connecting section, and one end of a horizontally arranged support rod is fixedly connected with one end of the bearing outer ring and is fixedly connected with the fixed block.
Preferably, the stepped drill bit is the same as a plurality of structures, the sub drill bits detachably connected from top to bottom are formed, each sub drill bit comprises a head and a connecting rod, the head comprises a base, blades and first drill teeth, one end of the connecting rod is a connecting male head, the other end of the connecting rod is fixedly connected with the base, the base is cylindrical, the blades are uniform in the circumferential direction and are arranged at the edge positions of the base at intervals, a plurality of chip breaking grooves are formed, the first drill teeth are respectively arranged at the edge positions of the blades, a connecting female head capable of being detachably connected with the connecting male head of the adjacent sub drill bit is arranged in the center of the base, and the diameter of the head of each sub drill bit is gradually reduced to be in a step shape from.
Preferably, the lower connecting part comprises a connecting table connected with the top end of the retaining wall cylinder, the outer ring of the connecting table is connected with the retaining wall cylinder, the inner ring of the connecting table is connected with the bottom end of the connecting cylinder, and the outer wall of the connecting cylinder is axially provided with convex plates at intervals; even, the interval cutting has the spread groove that matches with the protrusion board on the pipe wall of going up connecting portion, the protrusion board can be blocked to the spread groove, and the connecting cylinder can insert in the hollow connecting portion of going up.
Preferably, each drilling part comprises a blade block arranged on the outer periphery of the retaining wall cylinder and a blade block arranged on the inner periphery of the retaining wall cylinder; two rows of second drill teeth are axially arranged on the outer side face of each blade wing block, a plurality of second drill teeth are arranged on the lower end face of each arc-shaped blade wing block along the arc-shaped central line of the lower end face of each arc-shaped blade wing block, and the circle where the second drill teeth of the lower end face of each drilling part are located and the wall protection cylinder are concentric circles.
The beneficial technical effects of the invention are as follows:
1. for the technical problem that the drill bit is easy to fall off when penetrating through a gravel stratum, the invention provides the technical idea of arranging the wall protecting section type isolating device, wherein the gravel stratum is isolated from the inside of a drill hole through the wall protecting section, and the drill bit is protected from continuously drilling downwards. Furthermore, the invention designs a pluggable drilling tool with a wall protection section, so that the wall protection section is retained when the drilling tool drills into a gravel stratum, and the power section is carried to the outside, and the power section can be recycled. The retaining wall section is provided with a drilling part to enable the retaining wall section to have drilling capacity, when a crushed stone stratum filled with fly ash/cement is drilled, the crushed stone filling body can enter the retaining wall section, so that an internal drilling system comprising an inner drill rod, a wing-shaped blade and a stepped drill bit is arranged, the crushed stone filling body in the retaining wall section can be crushed (if the crushed stone filling body in the retaining wall section is not crushed, subsequent drilling still can cause the problem of drill falling), and the size of the retaining wall section is far larger than that of a traditional drill bit, so that the phenomenon of drill falling can not occur (the drill bit is smaller than a crushed stone block and is easy to fall, and the retaining wall cylinder is larger than the crushed stone and is not.
2. The stepped drill bit is matched with the wing-shaped blades, the stepped drill bit can improve the drilling efficiency (the efficiency of grinding rocks is high), but because the stepped drill bit passes through a broken stone filling body, broken stones are not beneficial to grinding as well as complete rocks, and are easy to slide, so the wing-shaped blades can play a role of crushing the broken stones which are not crushed by the stepped drill bit (similar to the working principle of a soybean milk maker and a wall breaking machine).
3. Because the inside and the outside of the retaining wall cylinder are provided with the gravels, and the gravels are uneven in shape and size, the forces acting on the inner wall and the outer wall of the retaining wall cylinder are different, so the device is easy to be deflected by the acting force of the gravels in the drilling process; aiming at the problem, the inner wall and the outer wall of the retaining wall cylinder are both provided with the cutter wing blocks, the side surfaces of the cutter wing blocks are both provided with the drill teeth, and the lower end surfaces of the cutter wing blocks are also provided with the drill teeth, so that when the drilling is carried out, all the crushed stones (possibly contacted) around the retaining wall cylinder can be broken into unobstructed space for downward drilling.
Drawings
FIG. 1 is a cross-sectional view of a drilling system traversing a two-layer gravel formation.
Fig. 2 is a drilling tool of the present invention.
Fig. 3 is a block diagram of a drilling tool attachment portion of the present invention.
FIG. 4 is a view of a single step bore of the present invention.
In the figure, the drilling system 00; upper gravel formation 01; a lower gravel formation 02; a drill rod 03; a power section 1; a drill rod connection section 11; a transition section 12, an upper connection section 13; a driving motor 141; a support frame 142; an inner drill rod 143; a bearing 151; a fixed block 152; a support rod 153; a wing-like blade 16; a stepped drill 17; a base 171; a blade 172; first drill teeth 173; chip flutes 174; the connecting female 175; a connecting rod 176; an upper connecting portion 18; a connecting groove 181; a wall protecting section 2; a lower connecting portion 21; a connecting table 211; a connecting cylinder 212; a projection plate 213; a wall-protecting cylinder 22; the wing blocks 231; second drilling teeth 232.
Detailed Description
Referring to fig. 2-4, a drilling tool for penetrating a gravel stratum, which may be a mined-out area after coal mining, includes a power section 1 and a retaining wall section 2, which are coaxially arranged and detachably connected; the power section 1 comprises a drill rod connecting section 11, a horn-shaped transition section 12 and an upper connecting section 13 from top to bottom, wherein the diameter of the upper connecting section 13 is larger than that of the drill rod connecting section 11, the upper part of the drill rod connecting section 11 is connected with a drill rod 03, and the upper connecting section 13 is connected with a lower connecting part 21 at the upper end of the dado section 2 in a pluggable manner through an upper connecting part 18 at the lower end of the upper connecting section; a support frame 142 is horizontally arranged in the transition section 12, a driving motor 141 is fixed on the support frame 142, and an output shaft of the driving motor is connected with an inner drill rod 143; the upper part of the inner drill rod 143 extending into the wall protecting section 2 is uniformly provided with a plurality of layers of wing-shaped blades 16 from top to bottom, each layer is uniformly provided with more than 2 wing-shaped blades 16, the bottom of the inner drill rod 143 is connected with a stepped drill bit 17, and the bottom end of the stepped drill bit is higher than the bottom end of the wall protecting section 2; the wall protecting section 2 comprises a lower connecting part 21, a wall protecting cylinder 22 and a plurality of drilling parts from top to bottom, wherein the drilling parts are uniformly arranged at intervals along the circumferential direction of the wall protecting cylinder 22.
Preferably, a device for fixing the inner drill rod 143 is disposed inside the upper connecting section 13, the device includes a bearing 151 coaxially fixed on the inner drill rod 143, a fixing block 152 fixed on the inner wall of the upper connecting section 13, and one end of a horizontally disposed support rod 153 fixedly connected with the outer ring of the bearing 151 and the other end fixedly connected with the fixing block 152.
Preferably, a plurality of layers of wing-shaped blades 16 are uniformly arranged on the inner drill rod 143 inside the upper connecting section 13 from top to bottom, and more than 2 wing-shaped blades 16 are uniformly arranged on each layer.
Preferably, the stepped drill 17 is composed of a plurality of sub-drill heads which have the same structure and are detachably connected from top to bottom, each sub-drill head comprises a head part and a connecting rod 176, the head part comprises a base part 171, blades 172 and first drill teeth 173, one end of the connecting rod 176 is a connecting male head, the other end of the connecting rod 176 is fixedly connected with the base part 171, the base part 171 is cylindrical, the blades 172 are uniformly arranged at the edge position of the base part 171 at intervals along the circumferential direction, a plurality of chip breaking grooves 174 are formed, the first drill teeth 173 are respectively arranged at the edge position of each blade 172, a connecting female head 175 which can be detachably connected with the connecting male head of the adjacent sub-drill head is arranged at the center of the base part 171, and the diameter of each sub-drill head is gradually reduced.
Preferably, the female connection head and the male connection head are connected in an internal and external thread mode.
Preferably, the lower connecting portion 21 comprises a connecting platform 211 connected with the top end of the retaining wall cylinder 22, the outer ring of the connecting platform 211 is connected with the retaining wall cylinder 22, the inner ring of the connecting platform 211 is connected with the bottom end of the connecting cylinder 212, and the outer wall of the connecting cylinder 212 is provided with protruding plates 213 at intervals in the axial direction; the pipe wall of the upper connecting part 18 is evenly and alternately cut with connecting grooves 181 matched with the convex plates 213, the connecting grooves 181 can clamp the convex plates 213, and the connecting cylinder 212 can be inserted into the hollow upper connecting part 18.
Preferably, the diameter of the upper connector 18 is greater than the diameter of the connector barrel 212 and less than the diameter of the wall guard barrel 22.
Preferably, each drilling portion includes a blade block 231 disposed at an outer periphery of the retaining wall cylinder 22 and a blade block 231 disposed at an inner periphery of the retaining wall cylinder; two rows of second drilling teeth 232 are axially arranged on the outer side surface (relative to the retaining wall cylinder 22) of each blade wing block 231, a plurality of second drilling teeth 232 are arranged on the lower end surface of each arc-shaped blade wing block 231 along the arc-shaped central line of the blade wing block, and the circle of the second drilling teeth on the lower end surface of all drilling parts is concentric with the retaining wall cylinder 22.
Preferably, the drive motor 141 is powered by a cable, which is arranged inside the drill rod 03.
The drilling method for penetrating the gravel stratum by adopting the drilling tool comprises the following construction steps: s1, in the foundation stabilization area, connecting the drill rod 03 by using a conventional drill bit, and constructing a plurality of drill holes from the ground to a gravel stratum;
preferably, the bore diameter is smaller than the outer diameter of the wall protection cylinder;
s2, lifting the drill and grouting when drilling to a position where slurry flushing liquid is completely leaked, namely drilling to the upper gravel stratum 01; installing a wellhead device at the orifice, wherein the wellhead device adopts a four-way structure, the upper way is connected with a pressure gauge, the lower way is connected with a drill hole, one of two horizontal ways is connected with a grouting pipeline, and the other way is connected with a water injection pipeline; the method comprises the steps of firstly injecting water to wash out a gap between the pipeline and the crushed stones in the upper crushed stone stratum, then grouting, and then alternately pumping grouting body and clear water, so that the diffusion range of the grouting slurry is enlarged.
Preferably, an injection scheme of normal-pressure grouting and high-pressure water injection is adopted.
Preferably, the injected slurry is a fly ash slurry.
Firstly, injecting water to wash a gap between the pipeline and the crushed stones in the goaf, and simultaneously washing small crushed stones/powder to a far end to provide a grouting space for subsequent grouting; by adopting the technical scheme of alternate pump injection, the diffusion range of the thick slurry with water is limited, and small gaps are easily plugged, so that the diffusion range of the slurry is small, the injected high-pressure clear water can flush the slurry filled near the drill hole to the far end, and further the diffusion range of the next grouting slurry is improved, and the process is repeated.
S3, after grouting, connecting the upper part of the drill rod connecting section 11 of the drilling tool penetrating through the gravel stratum with a drill rod 03, drilling along an original drilled hole, cutting gravel and a filling body in the upper gravel stratum 01 by a drilling part until drilling to a certain depth of a bottom plate of the upper gravel stratum 01, and positioning the top end of the wall protecting section 2 in a certain range in a complete top plate of the upper gravel stratum 01;
meanwhile, the internal drilling system also works, namely the driving motor drives the inner drill rod 143 to rotate, and the stepped drill bit 17 and the wing-shaped blade 16 are driven to cut broken stones in the drilling tool;
preferably, the whole drilling process is carried out by pumping slurry flushing fluid from the interior of the drill pipe;
s4, lifting the drill, wherein the power section 1 is lifted to the ground along with the drill rod 03, and the lower wall protecting section 2 is left in the upper gravel stratum 01 to isolate the upper gravel stratum from the inner space of the drill hole;
preferably, there is the further step of fixing the wall-protecting section by injecting cement slurry;
s5, connecting the drill rod 03 by using a conventional drill bit, and continuously drilling along the original drilled hole, wherein the drill bit penetrates through the upper gravel layer 01 from the interior of the drill rod under the protection of the protective wall section 2;
s6, continuing drilling, and lifting the drill when the drill reaches a position where the slurry flushing liquid is completely leaked, namely the drill reaches a lower gravel stratum 02; grouting, wherein the grouting method is the same as the step S2;
and S7, after grouting, sealing holes with cement paste to a certain distance from the ground surface, then placing a reinforcement cage, and continuously pouring cement paste to form a reinforced cement pile for reinforcing the shallow foundation.
Claims (9)
1. A drilling method for penetrating a gravel stratum comprises the following construction steps: s1, in the foundation stabilization area, connecting a drill rod by using a conventional drill bit, and constructing a plurality of drill holes from the ground to the gravel stratum;
s2, when drilling into the upper gravel stratum, lifting the drill, grouting, and injecting slurry which is fly ash slurry; installing a wellhead device at the orifice, wherein the wellhead device adopts a four-way structure, the upper way is connected with a pressure gauge, the lower way is connected with a drill hole, one of two horizontal ways is connected with a grouting pipeline, and the other way is connected with a water injection pipeline; firstly, injecting water to wash out a gap between the pipeline and the gravels in the upper gravel stratum, then grouting, and then alternately pumping grouting body and clear water;
s3, drilling along the original drilled hole by adopting a gravel-penetrating drilling tool after grouting, wherein the gravel-penetrating drilling tool comprises a power section and a wall protection section which are coaxially arranged, the power section comprises a drill rod connecting section, a horn-shaped transition section and an upper connecting section from top to bottom, the wall protection section comprises a lower connecting part, a wall protection barrel and a plurality of drilling parts from top to bottom, and the upper connecting section is connected with the lower connecting part in a pluggable manner through the upper connecting part at the lower end of the upper connecting section; connecting the upper part of the drill rod connecting section with a drill rod, and cutting crushed stone and a filling body in the upper crushed stone stratum by a drilling part until the crushed stone and the filling body are drilled into a bottom plate of the upper crushed stone stratum at a certain depth, wherein the top end of the wall protecting section is positioned in a complete top plate of the upper crushed stone stratum within a certain range;
meanwhile, an internal drilling system also works, wherein the internal drilling system is characterized in that a support frame is horizontally arranged in the transition section, a driving motor is fixed on the support frame, an output shaft of the driving motor is connected with an inner drill rod, the upper part of the inner drill rod is provided with a plurality of layers of wing-shaped blades, more than 2 wing-shaped blades are uniformly arranged on each layer, and the bottom of the inner drill rod is connected with a stepped drill bit; starting a driving motor to drive the inner drill rod to rotate so as to drive the stepped drill bit and the wing-shaped blade to cut broken stones in the drilling tool;
s4, lifting the drill, wherein the power section is lifted to the ground along with the drill rod, and the lower wall protecting section is left in the upper gravel stratum to isolate the upper gravel stratum from the inner space of the drill hole;
s5, connecting the drill rod with a conventional drill bit, and continuing drilling along the original drill hole, wherein the drill bit penetrates through the upper gravel layer from the interior of the drill bit under the protection of the wall protecting section;
s6, drilling continuously, when drilling to the lower gravel stratum, lifting the drill, then grouting, the grouting method is the same as the step S2;
and S7, after grouting, sealing holes with cement paste to a certain distance from the ground surface, then placing a reinforcement cage, and continuously pouring cement paste to form a reinforced cement pile for reinforcing the shallow foundation.
2. The method of claim 1, wherein in step S1, the borehole diameter is smaller than the outer diameter of the retaining wall cylinder.
3. The method of claim 1, wherein in step S2, the injection scheme is normal pressure grouting and high pressure water injection.
4. The method of claim 1, wherein in step S3, slurry flushing fluid is pumped from the inside of the drill pipe during the whole drilling process.
5. The method of claim 1, wherein the upper connecting section has a diameter greater than the diameter of the drill pipe connecting section, the drilling portions are circumferentially spaced and evenly disposed along the retaining wall cylinder, and the bottom end of the stepped drill bit is higher than the bottom end of the retaining wall section.
6. The method of claim 1, wherein the upper connecting section is provided with means for securing the inner drill rod therein, the means comprising a bearing coaxially secured to the inner drill rod, a securing block secured to the inner wall of the upper connecting section, and a horizontally disposed support rod having one end fixedly secured to the outer race of the bearing and the other end fixedly secured to the securing block.
7. The drilling method as claimed in claim 1, wherein the stepped drill bit comprises a plurality of sub-drill bits having the same structure and detachably connected from top to bottom, each sub-drill bit comprises a head portion and a connecting rod, the head portion comprises a base portion, a plurality of first drill teeth, one end of the connecting rod is a male connecting head, the other end of the connecting rod is fixedly connected with the base portion, the base portion is cylindrical, the plurality of blades are uniformly arranged at the edge of the base portion along the circumferential direction at intervals and form a plurality of chip breaking grooves, the plurality of first drill teeth are respectively arranged at the edge of each blade, a female connecting head detachably connected with the male connecting head of the adjacent sub-drill bit is arranged at the center of the base portion, and the diameter of the head portion of each sub-drill bit is gradually reduced from top to bottom to form a step shape.
8. The drilling method for penetrating a crushed stone stratum as claimed in claim 1, wherein the lower connecting portion comprises a connecting table connected with the top end of the retaining wall cylinder, the outer ring of the connecting table is connected with the retaining wall cylinder, the inner ring of the connecting table is connected with the bottom end of the connecting cylinder, and the outer wall of the connecting cylinder is provided with protruding plates at intervals in the axial direction; even, the interval cutting has the spread groove that matches with the protrusion board on the pipe wall of going up connecting portion, the protrusion board can be blocked to the spread groove, and the connecting cylinder can insert in the hollow connecting portion of going up.
9. The method of drilling through a gravel formation of claim 1, wherein each drilling section comprises a wing block disposed on an outer circumference of the retaining wall cylinder and a wing block disposed on an inner circumference of the retaining wall cylinder; two rows of second drill teeth are axially arranged on the outer side face of each blade wing block, a plurality of second drill teeth are arranged on the lower end face of each arc-shaped blade wing block along the arc-shaped central line of the lower end face of each arc-shaped blade wing block, and the circle where the second drill teeth of the lower end face of each drilling part are located and the wall protection cylinder are concentric circles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110068764.4A CN112878900A (en) | 2021-01-19 | 2021-01-19 | Drilling tool for penetrating gravel stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110068764.4A CN112878900A (en) | 2021-01-19 | 2021-01-19 | Drilling tool for penetrating gravel stratum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112878900A true CN112878900A (en) | 2021-06-01 |
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| CN102003140A (en) * | 2010-10-20 | 2011-04-06 | 中国地质大学（武汉） | Traversing reverse circulating drilling method of horizontal directional drilling pipeline and special drilling bit |
| CN103233466A (en) * | 2013-04-23 | 2013-08-07 | 罗海军 | Construction method for large-diameter bored pile penetrating through deep granular bedding |
| CN109667537A (en) * | 2017-10-16 | 2019-04-23 | 湖北中南勘察基础工程有限公司 | A kind of drilling process of prospecting filling land pebble solution cavity |
| CN209129542U (en) * | 2018-11-12 | 2019-07-19 | 中建八局轨道交通建设有限公司 | The boring jackrod structure of bad ground |
| CN110318706A (en) * | 2019-07-15 | 2019-10-11 | 神华神东煤炭集团有限责任公司 | A kind of method that drilling operation crosses goaf |
| CN110513114A (en) * | 2019-08-08 | 2019-11-29 | 中国建筑第四工程局有限公司 | A kind of shield-tunneling construction passes through the construction of high-strength boulder group |
| CN110645038A (en) * | 2019-09-25 | 2020-01-03 | 吕梁学院 | Drilling and hole washing integrated device for coal mine gas extraction |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102003140A (en) * | 2010-10-20 | 2011-04-06 | 中国地质大学（武汉） | Traversing reverse circulating drilling method of horizontal directional drilling pipeline and special drilling bit |
| CN103233466A (en) * | 2013-04-23 | 2013-08-07 | 罗海军 | Construction method for large-diameter bored pile penetrating through deep granular bedding |
| CN109667537A (en) * | 2017-10-16 | 2019-04-23 | 湖北中南勘察基础工程有限公司 | A kind of drilling process of prospecting filling land pebble solution cavity |
| CN209129542U (en) * | 2018-11-12 | 2019-07-19 | 中建八局轨道交通建设有限公司 | The boring jackrod structure of bad ground |
| CN110318706A (en) * | 2019-07-15 | 2019-10-11 | 神华神东煤炭集团有限责任公司 | A kind of method that drilling operation crosses goaf |
| CN110513114A (en) * | 2019-08-08 | 2019-11-29 | 中国建筑第四工程局有限公司 | A kind of shield-tunneling construction passes through the construction of high-strength boulder group |
| CN110645038A (en) * | 2019-09-25 | 2020-01-03 | 吕梁学院 | Drilling and hole washing integrated device for coal mine gas extraction |
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Application publication date: 20210601 |