CN108222843B - A kind of construction method preventing cast-in-situ bored pile bit freezing - Google Patents
A kind of construction method preventing cast-in-situ bored pile bit freezing Download PDFInfo
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- CN108222843B CN108222843B CN201810009375.2A CN201810009375A CN108222843B CN 108222843 B CN108222843 B CN 108222843B CN 201810009375 A CN201810009375 A CN 201810009375A CN 108222843 B CN108222843 B CN 108222843B
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- 238000010276 construction Methods 0.000 title claims abstract description 33
- 230000008014 freezing Effects 0.000 title claims abstract description 33
- 238000007710 freezing Methods 0.000 title claims abstract description 33
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 11
- 238000005553 drilling Methods 0.000 claims abstract description 134
- 238000005520 cutting process Methods 0.000 claims description 39
- 239000002002 slurry Substances 0.000 claims description 36
- 230000000712 assembly Effects 0.000 claims description 18
- 238000000429 assembly Methods 0.000 claims description 18
- 239000000956 alloy Substances 0.000 claims description 17
- 229910045601 alloy Inorganic materials 0.000 claims description 17
- 239000000725 suspension Substances 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 9
- 239000003818 cinder Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 16
- 239000004576 sand Substances 0.000 abstract description 13
- 230000015572 biosynthetic process Effects 0.000 abstract description 8
- 238000012545 processing Methods 0.000 abstract description 3
- 239000011499 joint compound Substances 0.000 description 30
- 210000000515 tooth Anatomy 0.000 description 15
- 241001074085 Scophthalmus aquosus Species 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000004927 clay Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 235000014653 Carica parviflora Nutrition 0.000 description 2
- 241000243321 Cnidaria Species 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 206010060904 Freezing phenomenon Diseases 0.000 description 1
- 241000425571 Trepanes Species 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical compound C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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
- 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
-
- 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
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- 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
- E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
- E21B19/08—Apparatus for feeding the rods or cables; Apparatus for increasing or decreasing the pressure on the drilling tool; Apparatus for counterbalancing the weight of the rods
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/024—Determining slope or direction of devices in the borehole
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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)
- Geophysics (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of construction methods for preventing cast-in-situ bored pile bit freezing, characterized by comprising the following steps: the first step, prepares each component part of drill bit assembly, after drilling machine positioning, each component part of drill bit assembly is hung to by drilling machine and facilitates the position of lifting；Second step positions three wings drag bit；Third step installs counterweight；4th step installs drill bit connecting rod and screw cone；Drilling rig power plant is connect by the 5th step with drill bit connecting rod；6th step detects verticality；7th step, jointed rod；8th step, hitch up after bit contact bottom hole；The construction method for preventing cast-in-situ bored pile bit freezing of the invention is able to solve because of bit freezing problem produced by collapse hole, the peeling of casing sand body and Karst Cave Formation reason, avoids influence of the conventional process mode of bit freezing to pile foundation quality；Secondly, reducing because of human cost and machine cost brought by processing bit freezing, while accelerating the construction speed of pile foundation, increases project benefit.
Description
Technical field:
The present invention relates to a kind of construction methods for preventing cast-in-situ bored pile bit freezing, belong to drill-pouring in civil engineering subject
Stake field.
Context analyzer:
As the progress infrastructure of social economy is increasing, large diameter bored pile be widely used in bridge,
The heavy constructions such as railway, nuclear power station, for pore-forming technique based on mud off reverse circulation, common drill bit is three wings scraper brill
Head.In traditional construction technology, when encountering the very low cohesive forces such as layer of sand, mud and stratum loosely, Yi Fasheng collapse hole and
" burying " phenomenon；For large diameter pile foundation in order to avoid this phenomenon, crept into after taking embedded casing, and in drilling process, it has bored
Casing side wall have remnants, this part residue, which easily peels off, to be sunk on drill bit.Mud property is difficult to control in reverse circulation construction, because
Drilling machine is inoperative for a long time when inevitable factor is stopped work, and mud sediment promotes top specific gravity too low, and hole wall easily collapses, and makes
It obtains collapsed portion to be pressed on drill bit, causes drill bit that can not extract.In addition, when encountering Karst Cave Formation in bored pile construction,
One side drill bit passes through solution cavity layer from side, and the Upper Plate of Karst Cave that the other side does not drill is by fitchering；Another aspect drill bit may
It is oblique to enter horizontal hole, cause drill bit that can not lift, generates to inhale and bore.
In order to solve the problems, such as above-mentioned bit freezing, traditional processing bit freezing measure is generally comprised: 1. vibration hammer, is gently mentioned after bit freezing
When motionless, loosened around drill bit using vibration hammer and extracted after the boring mud on top；2. cleaning bottom of hole, borehole cleaning repeatedly, by constantly weighing
Cleaning bottom of hole, borehole cleaning are answered to remove the boring mud on around drill bit and top, borehole cleaning carries out simultaneously with brill is mentioned；3. underwater demolition mentions brill, will prevent
The sliding slot that water explosive puts drill bit is put into drill bit bottom, ignites shake loose drill bit later, recycles hoist engine and other lifting means simultaneously
Lift drill bit.
Although above-mentioned treatment measures can successfully propose drill bit to a certain extent, not only increase in work progress
Extra labour and machine cost, also greatly delays construction speed, and largely influences the construction matter of pile foundation
Amount.Therefore, it is necessary to by way of changing drill bit, to effectively prevent " bit freezing " phenomenon.Current some patents to its into
Corresponding improvement is gone, such as CN204225772U, title " a kind of anti-sticking drill bit ", which is characterized in that using in the middle part of drill body
The setting of two sides relative position anti-sticking cutting tooth, realize the fragment that drilling is formed during drilling using drill bit sheet
Anti-sticking cutting tooth in the middle part of body is effectively ground and is drained, and drill bit is facilitated to exit drilling.It is insufficient for positive-circulation drilling
Place is: first is that the drill bit device is suitable for, quarrying is drilled, tunnel spuds in or mine is drilled, and is not suitable for the brill of bored concrete pile
Hole；Second is that encountering clay layer, the limbers of two sides relative position is easily clung by clay, loses the function of deslagging, and is easy to produce
Raw " paste bores " phenomenon；Third is that the drill bit device is only applicable to compared with hard formation, efficiency is lower in mud, gravel and cohesive soil stratum,
Influence drilling efficiency.CN205154037U, title " drill bit of construction drill bored concrete pile ", it is characterised in that banket, mud,
When being crept into the loose stratum that easily collapses such as layer of sand using casing, effectively bored using the cleaning shoe and steel brush sub-assembly that are mounted on retaining ring
Fall the sandy soil body between casing and stake holes.Disadvantage is that: first is that the drill bit device only prevents casing side wall boring mud
It peels off, when collapse hole occurs, drill bit is still unable to satisfy proposition；Second is that encountering Karst Cave Formation, the drill bit is easily stuck and can not pull out
Out, increase economic cost and influence construction speed and pile foundation quality.
It can be seen that the measure of conventional process bit freezing can generate large effect to pile foundation quality, and delay the duration, increases
Construction cost.And above-mentioned two follow although solving the problems, such as bit freezing to a certain extent for positive and negative by granted patent
All there is certain deficiency in the construction of trepan hole pouring pile.Therefore, in order to solve the deficiency of conventional process measure and above-mentioned patent,
Devise a kind of reverse circulation preventing sticking three wings drag bit assemblies and its installation method.
Summary of the invention:
The purpose of the present invention: in order to effectively prevent " bit freezing " phenomenon, the increased extra cost of conventional process measure is avoided
And the influence to pile foundation quality, in addition, providing one kind prevents drill-pouring for the deficiency of two granted patents in background technique
The construction method of stake bit freezing, can effectively solve the problem that mud, gravel and cohesive soil stratum are produced in the pore forming process of cast-in-situ bored pile
Raw bit freezing problem, while when encountering bit freezing caused by Karst Cave Formation, it can quickly complete and mention brill, largely reduce
Construction cost, and ensure that on the basis of not influencing drilling efficiency the quality of pile foundation.
The technical solution adopted by the present invention is as follows:
A kind of construction method preventing cast-in-situ bored pile bit freezing, which comprises the following steps:
The first step prepares each component part of drill bit assembly and is hung to each component part of drill bit assembly after drilling machine positioning
Drilling machine side and the position for facilitating lifting；
The drill bit assembly includes drill bit connecting rod, screw cone, counterweight, three wings drag bit, in which: drill bit connecting rod
It is equipped with connecting rod slurry channel, screw cone is connected with drill bit connecting rod, and the outer surface of screw cone is equipped with spiral cutting item,
Spiral grooves are formed between adjacent spiral cutting item, mud hole is provided in spiral grooves, counterweight is set to screw cone
Lower section, counterweight is equipped with counterweight slurry channel, and counterweight slurry channel is connected with connecting rod slurry channel, is additionally provided in counterweight
Verticality measurement device, three wings drag bit are installed on the lower section of counterweight, and three wings drag bit includes a conduit, conduit and extension bar
Slurry channel and counterweight slurry channel match, and three center is on a vertical line；One drill bit skeleton is installed on conduit,
Apex point is set to the bottom of conduit, and apex point is equipped with alloy cutting blocks；
Second step positions three wings drag bit: three wings drag bit being hung to alignment hole center by loop wheel machine, is passed through
The detent ring flange being arranged on three wings drag bit is stuck on drilling machine platform, so that three wings drag bit is stably placed at drilling machine and puts down
On platform；
Third step installs counterweight: counterweight being hung to the top of three wings drag bit by loop wheel machine, adjusts the position of counterweight,
Then counterweight is connect with three wings drag bit, is stuck on drilling machine platform by the counterweight rectangular cam being arranged in counterweight, so that
Counterweight and three wings drag bit assemblies are stably placed on drilling machine platform；
4th step, install drill bit connecting rod and screw cone: screw cone is fully welded in the side of drill bit connecting rod, the two shape
At an overall structure；Drill bit connecting rod is hung to the top of counterweight by loop wheel machine, utilizes the position of loop wheel machine adjustment drill bit connecting rod
It sets, it is flat to be then stuck in drilling machine by the connecting rod rectangular cam being arranged in drill bit connecting rod with reconnection for drill bit connecting rod
On platform, so that entire drill bit assembly is stably placed on drilling machine platform；
Drilling rig power plant is connect by the 5th step with drill bit connecting rod；
6th step detects verticality: by the verticality measurement device being arranged in counterweight, detecting the vertical of drill bit assembly
Degree, and be adjusted by the tight condition of control drilling rig power plant and screw；
7th step, jointed rod: the connection of power device of rigging down and drill bit connecting rod, and by drilling rig power plant with
Drilling rod, is then adjusted to above drill bit connecting rod, drilling rod and drill bit connecting rod is connected and fixed by next section drilling rod connection；
8th step, hitch up after bit contact bottom hole.
Further it is provided in:
A kind of construction method preventing cast-in-situ bored pile bit freezing, which comprises the following steps:
The first step prepares each component part of drill bit assembly, and shield-tube embedment finishes, after drilling machine positioning, by invention components
Each component part be hung to the position for by drilling machine and facilitating lifting；
The drill bit assembly includes drill bit connecting rod, screw cone, counterweight, three wings drag bit, in which: drill bit connecting rod
It is equipped with connecting rod slurry channel, screw cone is connected with drill bit connecting rod, and the outer surface of screw cone is equipped with spiral cutting item,
Spiral grooves are formed between adjacent spiral cutting item, mud hole is provided in spiral grooves, counterweight is set to screw cone
Lower section, counterweight is equipped with counterweight slurry channel, and counterweight slurry channel is connected with connecting rod slurry channel, is additionally provided in counterweight
Verticality measurement device, three wings drag bit are installed on the lower section of counterweight, and three wings drag bit includes a conduit, conduit and extension bar
Slurry channel and counterweight slurry channel match, and three center is on a vertical line；One drill bit skeleton is installed on conduit,
Apex point is set to the bottom of conduit, and apex point is equipped with alloy cutting blocks；
Second step, position three wings drag bit: strictive drill platform opens, and is hung to three wings drag bit pair by loop wheel machine
Quasi- hole center, suspension hook move down, until the detent ring flange of three wings drag bit shrinks drilling machine platform close to drilling machine platform,
Just detent ring flange is stuck on drilling machine platform at this time, so that three wings drag bit is steadily placed；
Third step is dismantled lifting rope and snap ring on drill bit, and is transferred in counterweight, counterweight to be hung；
4th step installs counterweight: according to third step, counterweight being hung to the top of three wings drag bit by loop wheel machine, utilizes
The position of loop wheel machine adjustment counterweight makes the lower flange disk of counterweight be directed at drill bit ring flange, and cleaning flange panel surface is needed before connection
Sundries or anvil cinder, avoid connecting portion from gap occur, and then lead to inclined hole；Screw is passed through together counterweight lower part screw hole and
The drill screw hole of three wings drag bit, puts on each nut, using manpower or mechanical force by screw tightening；
5th step, after counterweight installs, drilling machine platform opens, under counterweight and three wings drag bit assemblies are with suspension hook
Move, to counterweight rectangular cam close to drilling machine platform, shrink drilling machine platform, counterweight rectangular cam is stuck on drilling machine platform, counterweight and
Three wings drag bit assemblies are steadily placed；
6th step shifts suspension centre: lifting rope and snap ring in disassembly counterweight, and is transferred in drill bit connecting rod, drill bit to be hung
Connecting rod；
7th step, install drill bit connecting rod and screw cone: screw cone is fully welded in the side of drill bit connecting rod, the two shape
At an overall structure；Drill bit connecting rod is hung to the top of counterweight by loop wheel machine, utilizes the position of loop wheel machine adjustment drill bit connecting rod
It sets so that connecting rod lower flange disk is directed at counterweight upper flange disk；Screw is passed through to connecting rod screw hole and counterweight top together
Screw hole puts on each nut, using manpower or mechanical force by screw tightening；At this point, drill bit connecting rod is together with screw cone
It is mounted in counterweight, rigid preventing sticking three wings drag bit assemblies is integrally formed, and the center of three is located at one vertically
On line；
8th step, fixed drill bit connecting rod: after drill bit connecting rod installs, drilling machine platform opens, entire preventing sticking three wings
Drag bit assemblies are moved down with suspension hook, to connecting rod rectangular cam close to drilling machine platform, shrink drilling machine platform, connecting rod square
Shape convex block is stuck on drilling machine platform, and preventing sticking three wings drag bit assemblies are steadily placed；
9th step connects drill bit connecting rod and drilling rig power plant: lifting rope and snap ring in disassembly drill bit connecting rod will bore
Head connecting rod is connect with drilling rig power plant；Drilling rig power plant is fixed on drilling machine truss, can be carried out by upper and lower telescopic rod
It moves up and down；
Tenth step, detect verticality: drilling machine platform opens, and drill bit assembly is promoted using telescopic rod above and below drilling machine, by counterweight
On three spirit level horizontals be placed on three and shelve on plate；Whether the bubble observed in three level meters is placed in the middle, when not placed in the middle
Illustrate that verticality is poor, is adjusted by the tight condition of control power head and inspection screw, can then be carried out down after placed in the middle
One step；
11st step connects next section drilling rod: screw of the dismantling connection in the upper connecting rod ring flange of drilling rig power plant
And nut, the upper flanges disk of next section drilling rod is connect with drilling rig power plant, and next section drilling rod is adjusted to drill bit connection
Above bar, the screw hole and connecting rod top screw hole being aligned on next section drilling rod put on each nut, utilize manpower or machinery
Power is by screw tightening；
12nd step repeats the 11st step, until hitch up after bit contact bottom hole.
Beneficial effects of the present invention are as follows:
The construction method for preventing cast-in-situ bored pile bit freezing of the invention, be able to solve because collapse hole, casing sand body peel off with
And bit freezing problem produced by Karst Cave Formation reason, avoid influence of the conventional process mode of bit freezing to pile foundation quality；Secondly, subtracting
Less because of human cost and machine cost brought by processing bit freezing, while accelerating the construction speed of pile foundation, increases project benefit.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of preventing sticking three wings drag bit assemblies；
Fig. 2 is the A-A diagrammatic cross-section of drill bit connecting rod shown in Fig. 1 and screw cone；
Fig. 3 is the structural schematic diagram of counterweight；
Fig. 4 is the overlooking state figure of counterweight；
Fig. 5 is the structural schematic diagram of testing apparatus for verticality；
Fig. 6 is the structural schematic diagram of three wings drag bit；
Fig. 7 is the Construction State schematic diagram of present invention installation drill bit assembly；
Fig. 8 is the Construction State schematic diagram of present invention installation drilling rod and drilling rig power plant；
Fig. 9 is a kind of Construction State figure of Application Example of the present invention (collapse hole, casing sand body peel off burying schematic diagram)；
Figure 10 is the Construction State figure (Karst Cave Formation bit freezing schematic diagram) of another Application Example of the invention.
Figure label: 1- drill bit connecting rod, 11- connecting rod slurry channel, 12- connecting rod upper flange disk, 13- connecting rod
Top screw hole, 14- connecting rod rectangular cam, 15- connecting rod lower flange disk, 16- connecting rod lower part screw hole；2- screw conic
Body, 21- alloy cutting tooth, 22- spiral cutting item, 23- spiral grooves, 24- mud hole；3- counterweight, 31- centralizer, 32- counterweight
Core, 33- counterweight slurry channel, 34- counterweight upper flange disk, 35- counterweight top screw hole, 36- counterweight rectangular cam, 37- match
Weight lower flange disk, 38- counterweight lower part screw hole, 39- verticality measurement device, 391- shelve plate, 392- baffle, 393- level
Instrument；4- three wings drag bit, 401- conduit, 402- drill bit ring flange, 403- drill screw hole, 404- stiffening ring, 405- prism
Cutting tooth, the middle part 406- reinforcing floor, the top 407- reinforcing floor, 408- wing plate, 409- apex point, 410- alloy cutting blocks,
411- mud outlet, 412- drill bit detent ring flange, 5- strictive drill platform, 6- drilling, the stratum 7-, the sand body that 8- is fallen, 9-
Solution cavity, 10- drilling rod, 20- drilling rig power plant, 30-loop wheel machines, the side 40- pass through, the side 50- bit freezing, 60- or more telescopic rod,
70- truss.
Specific embodiment:
As Figure 1-Figure 8, a kind of reverse circulation preventing sticking three wings drag bit assemblies, including drill bit connecting rod 1, spiral
Cone 2, counterweight 3, three wings drag bit 4, in which:
Drill bit connecting rod 1 includes connecting rod slurry channel 11, connecting rod upper flange disk 12, connecting rod top screw hole
13, connecting rod rectangular cam 14, connecting rod lower flange disk 15, connecting rod lower part screw hole 16, connecting rod slurry channel 11 is set
It is placed in drill bit connecting rod 1, connecting rod slurry channel 11 and the inflated diameter of each drilling rod match, convenient for mud in reverse circulation
The circulation of slurry.Connecting rod upper flange disk 12, the ring flange size of size and each drilling rod are equipped on 1 top of drill bit connecting rod
Unanimously, it is preferable that the outer uniformly distributed 8 connecting rod top screw holes 13 that make a circle of connecting rod upper flange disk 12, using on extension bar
Drill bit connecting rod 1 is connect by portion's screw hole 13 with upper section drilling rod.12 lower section two sides of connecting rod upper flange disk are equipped with a pair of connect
Extension bar rectangular cam 14 blocks connecting rod rectangular cam 14 using strictive drill operation platform in installation process, so that drill bit
The whole steady placement of connecting rod 1 and the coupling part below of drill bit connecting rod 1, in order to avoid fall into hole.1 lower part of drill bit connecting rod is set
There are a connecting rod lower flange disk 15 and connecting rod lower part screw hole 16, in size and connecting rod upper flange disk 12 and connecting rod
Portion's screw hole 13 is consistent.
The screw cone 2 is set to the outside of drill bit connecting rod 1, and screw cone 2 is steel cone, screw cone 2
Including alloy cutting tooth 21, spiral cutting item 22, spiral grooves 23, mud hole 24.In 2 bottom of screw cone, one lap welding has alloy
Cutting tooth 21, alloy cutting tooth 21 can effectively be ground, spiral cutting item 22 is distributed in spiral shell at tooth shape blocking part
The outer surface of spiral cone 2, spiral cutting item 22 is helical form, section is trapezoidal steel strip, can be right when drill bit is buried
The sand body on drill bit top carries out cutting and grinds.Spiral grooves 23 are formed between two adjacent spiral cutting items 22, are bit freezing
When slagging channel is provided, spiral cutting item 22 and spiral grooves 23 are all set as helical form, it is therefore intended that pass through drill bit when mentioning brill
Rotation, facilitate drill bit to mention by easy stages using the inclined-plane circular rotating of object and the physics of frictional force and mathematical principle
Out.Preferably, 3-5 mud hole 24 is set in spiral grooves 23, and facilitate drill bit top falls sand body or solution cavity card
Firmly the grinding disintegrating slag of part drains into bottom hole.
The counterweight 3 is that drill bit provides additional bit pressure in medium ground, counterweight 3 include centralizer 31, counterweight core 32,
Counterweight slurry channel 33, counterweight upper flange disk 34, counterweight top screw hole 35, counterweight rectangular cam 36, counterweight lower flange
Disk 37, counterweight lower part screw hole 38, verticality measurement device 39.Centralizer 31 is steel body, and it is in camber line that cross section is upper below
It is trapezoidal, wherein 32 periphery of the radian of top and counterweight core be adapted to, following radian and entire component drill bit periphery maximum gauge
Adaptation；Centralizer 31 is fully welded on counterweight core 32, plays the role of righting drill bit verticality, avoids generating inclined hole；In addition, working as hole
Wall hollow not Shunping County can be modified protrusion part by 31 side of centralizer, so that hole wall is more smooth neat.Counterweight
Core 32 is highdensity hollow cylinder lead body, and weight is higher under same volume, and additional bit pressure is provided for drill bit, is improved harder
The drilling efficiency on stratum.Cylinder type hollow in counterweight core 32 is counterweight slurry channel 33, diameter and connecting rod slurry channel
11 matchings.3 upper end of counterweight and bottom end are respectively equipped with counterweight upper flange disk 34, counterweight top screw hole 35 and counterweight lower flange
Disk 37, counterweight lower part screw hole 38, size are all matched with connecting rod lower flange disk 12, connecting rod lower part screw hole 13.Match
3 are weighed by counterweight upper flange disk 34, counterweight top screw hole 35 and connecting rod lower flange disk 12, connecting rod lower part screw hole
13 is corresponding, and utilizes screw tightening, completes the connection of counterweight 3 and drill bit connecting rod 1.It is identical as connecting rod rectangular cam 14, on
Ring flange 34 lower section two sides in portion's are equipped with a pair of of counterweight rectangular cam 36, block in installation process using strictive drill operation platform
Counterweight rectangular cam 36, so that the whole steady placement of counterweight 3 or counterweight 3 and coupling part below.
34 side of counterweight upper flange disk is symmetrically arranged with three verticality measurement devices 39 comprising shelves plate 391, baffle
392, level meter 393.Preferably, three 39 horizontal sextant angles of verticality measurement device are 120 degree, each verticality measurement device 39
Plate 391 is shelved equipped with horizontal, one end is arc, is fully welded in 34 side of counterweight upper flange disk, radian and ring flange 34
Matching, shelves 391 other end of plate and is welded with baffle 392 vertically, 393 level of level meter, which is shelved on, shelves on plate 391, and passes through baffle
392 prevent level meter 393 from skidding off.Whether can determine whether counterweight upper flange disk 34 between two parties by the bubble in three level meters 393
It is whether horizontal, and then can determine whether the verticality of entire drill bit assembly；Due to drilling rod and preventing sticking three wings drag bit of the invention
Rigid connection, thus can guarantee the verticality of drilling rod and drill bit assembly entirety between two parties by adjusting the bubble in three level meters,
It avoids generating inclined hole in boring procedure.
The three wings drag bit 4 is steel body, including conduit 401, drill bit ring flange 402, drill screw hole 403,
Stiffening ring 404, prism cutting tooth 405, middle part reinforces floor 406, top reinforces floor 407, wing plate 408, apex point 409, alloy
Cutting blocks 410, mud outlet 411, detent ring flange 412.The diameter of conduit 401 is logical with connecting rod slurry channel 11 and with weighted mud
Road 33 matches, and three center is on a vertical line；Drill bit ring flange 402, drill screw hole 403 and counterweight lower flange disk
37, screw hole 38 size in counterweight lower part matches, and three wings drag bit 4 can be connected in counterweight 3 by screw.In conduit
401 outside is provided with stiffening ring 404, and stiffening ring 404 is the discoid body of height 30cm, thickness 1cm, stiffening ring 404 and drill bit
Floor 407 is reinforced by top between ring flange 402 to connect, stiffening ring 404 with in the middle part of conduit 401 floor is reinforced by middle part
406 connections, stiffening ring 404 and 401 bottom of conduit are connect by wing plate 408, in this way, stiffening ring 404 can erect wing plate 408 and
401 bottom of conduit, middle part reinforce in the middle part of floor 406 and conduit and top reinforces the company of floor 407 and drill bit ring flange 402
It connects, forms the overall skeleton of three wings drag bit 4.Preferably, 404 surface of stiffening ring, one lap welding has 24 prism cutting tooths 405,
It is acted on first is that stiffening ring 404 is protected not worn by hole wall, and effect is second is that hole wall protrusion point can be cut.Middle part reinforces floor
406, top reinforces floor 407, the thickness of wing plate 408 is 1cm, and apex point 409 is set to the bottom of conduit 401, and apex point 409 is thick
Degree is 2cm, middle part be it is hollow, 401 bottom of conduit and the hollow junction of apex point 409 are mud outlet 411, are bored in reverse circulation construction
It mutually circulates in bar with the mud in hole and all has to pass through mud outlet 411, can be carried in reacting cycle construction by mud outlet 411
Boring mud enters in drilling rod until outside evacuation aperture.Preferably, 6-8 rectangle alloy cutting blocks 410 are welded on three wing plates 408,
It is also welded with alloy cutting blocks 410 on apex point 409, drilling can be effectively performed by alloy cutting blocks 410, is applicable in simultaneously
In the medium grounds such as the soft class stratum such as clay, sand or mud and completely decomposed, middle weathering or coral rock；Drill bit ring flange
402 lower sections are equipped with detent ring flange 412, when installing counterweight 3, are fixed on strictive drill platform by detent ring flange 412, with
Convenient for the connection of counterweight 3 and three wings drag bit 4.
In conjunction with shown in Fig. 7-Figure 10, the application method of the reverse circulation preventing sticking three wings drag bit assemblies of the present embodiment,
Include the following steps:
The first step prepares each component part of drill bit assembly, and shield-tube embedment finishes, after drilling machine positioning, by invention components
Each component part be hung to the position for by drilling machine and facilitating lifting；
Second step, position three wings drag bit: strictive drill platform 5 opens, and is hung to three wings drag bit 4 by loop wheel machine
Alignment hole center, suspension hook move down, until detent ring flange 412 shrinks drilling machine platform 5, at this time just close to drilling machine platform 5
Detent ring flange 412 is stuck on drilling machine platform 5, so that three wings drag bit 3 is steadily placed；
Third step is dismantled lifting rope and snap ring on drill bit 4, and is transferred in counterweight 3, counterweight 3 to be hung；
4th step installs counterweight 3: according to third step, counterweight 3 being hung to the top of three wings drag bit 4 by loop wheel machine, benefit
Make counterweight lower flange disk 37 be directed at drill bit ring flange 402 with the position of loop wheel machine adjustment counterweight 3, cleaning flange is needed before connection
The sundries or anvil cinder of panel surface, avoid connecting portion from gap occur, and then lead to inclined hole；Screw is passed through to counterweight lower part spiral shell together
The drill screw hole 403 of wire hole 38 and three wings drag bit 4, puts on each nut, using manpower or mechanical force by screw tightening；
5th step, fixed weight 3: after counterweight 3 installs, drilling machine platform 5 opens, 4 component of counterweight 3 and three wings drag bit
It is moved down with suspension hook, to counterweight rectangular cam 36 close to drilling machine platform 5, shrinks drilling machine platform 5, counterweight rectangular cam 36 is stuck in
On drilling machine platform, counterweight 3 and 4 component of three wings drag bit are steadily placed；
6th step shifts suspension centre: lifting rope and snap ring in disassembly counterweight 3, and is transferred in drill bit connecting rod 1, bores wait hang
Head connecting rod 1；
7th step, installs drill bit connecting rod 1 and screw cone 2: screw cone 2 is fully welded in the side of drill bit connecting rod 1, and two
Person forms an overall structure；According to the 6th step, drill bit connecting rod 1 is hung to the top of counterweight 3 by loop wheel machine, utilizes loop wheel machine tune
The position of whole drill bit connecting rod 1 makes connecting rod lower flange disk 15 be directed at counterweight upper flange disk 34；Screw is passed through together
Connecting rod screw hole 16 and counterweight top screw hole 35, put on each nut, using manpower or mechanical force by screw tightening；This
When, drill bit connecting rod 1 and screw cone 2 are mounted on together in counterweight 3, and rigid preventing sticking three wings drag bit group is integrally formed
Part, and the center of three is located on a vertical line；
8th step, fixed drill bit connecting rod 1: after drill bit connecting rod 1 installs, drilling machine platform 5 opens, entire preventing sticking three
Wing drag bit assemblies are moved down with suspension hook, to connecting rod rectangular cam 14 close to drilling machine platform 5, shrink drilling machine platform 5, even
Extension bar rectangular cam 14 is stuck on drilling machine platform 5, and preventing sticking three wings drag bit assemblies are steadily placed；
9th step, connection drill bit connecting rod 1 and drilling rig power plant 20: lifting rope and snap ring in disassembly drill bit connecting rod 1,
Drill bit connecting rod 1 is connect with drilling rig power plant 20；Drilling rig power plant 20 is fixed on drilling machine truss 70, can be by upper and lower
Telescopic rod 60 moves up and down；
Tenth step, detect verticality: drilling machine platform 5 opens, and promotes drill bit assembly using telescopic rod 60 above and below drilling machine, will match
It weighs three on 3 level meters 393 and lies in a horizontal plane in three and shelve on plate 391；Observe whether the bubble in three level meters 393 occupies
In, illustrate that verticality is poor when not placed in the middle, is adjusted by the tight condition of control power head and inspection screw, after placed in the middle
Next step can then be carried out；
11st step connects next section drilling rod: screw of the dismantling connection in the upper connecting rod ring flange 12 of power device 20
And nut, the upper flanges disk of next section drilling rod 10 is connect with drilling rig power plant 20, and next section drilling rod 10 is adjusted to bore
1 top of head connecting rod, the screw hole and connecting rod top screw hole 13 being aligned on next section drilling rod 10 put on each nut, benefit
With manpower or mechanical force by screw tightening；
12nd step repeats the 11st step, until hitch up after bit contact bottom hole.
Application Example:
Concrete application of the invention is further described below in conjunction with Fig. 9 and Figure 10.
Application Example one:
As shown in figure 9, the main pier Pile Diameter of certain river-spanning bridge is 2.5m, design hole depth is that 98m(bottom hole to casing is risen
Degree), it is highly 36m that casing diameter, which is 2.8m,；Exploration report is shown as top mud, lower part clay, bottom fully weathered rock stratum
Geology, casing top to river bottom mud layer height is 12m before spudding in, and casing absolute altitude is consistent with operation platform absolute altitude.Drill bit connecting rod 1
Height be 2.5m, the internal diameter of slurry channel (a) 11 is 30cm, and the height of screw cone 2 is 2m, the height of three wings drag bit 4
Degree is 2.2m.
Softer by geology in this present embodiment, preventing sticking three wings drag bit assemblies of the present invention are not required to installation counterweight 3 and provide
Bit pressure.After installing invention components, drill bit continues to install drilling rod to third section drilling rod not in contact with bottom hole；Bit contact at this time
Bottom hole, the third section drilling rod super casing top 1.7m in the top.Collapse hole occurs when being drilled into bottom hole pitch casing top 48m, the sand under collapsing
The sand body that body and casing side wall are fallen is pressed on drill bit.By the power head rotary drill rod on drilling machine, the side Bian Xuanzhuan mentions brill, this
The spiral cutting item 22 of screw cone 2 on invention preventing sticking three wings drag bit assemblies carries out cutting to sand body and grinds；It bores
Slag drains into spiral grooves 23, drains into bottom hole by mud hole 24, utilizes the inclined-plane circular rotating of object and the physics of frictional force
Drill bit is facilitated to propose by easy stages with mathematical principle.Compared to conventional process bit freezing mode, the construction time of about 12-24h is saved,
And save human cost and machine cost.
Application Example two:
As shown in Figure 10, bridge spanning the sea main pier Pile Diameter in East Asia is 3.2m, and design hole depth is 88m(bottom hole to casing
Heights of roofs), it is highly 48m that casing diameter, which is 3.4m,；Exploration report is shown as coral rock geology, and has solution cavity；Casing before spudding in
Top to sea floor height is 35m, and casing absolute altitude is consistent with operation platform absolute altitude.The height of drill bit connecting rod 1 is 2.5m, slurry channel
(a) 11 internal diameter is 40cm, and the height of screw cone 2 is 2m, and 3 height of counterweight is 1.5m, and the height of three wings drag bit 4 is
2.2m。
It is middle hard place matter in this example, thus counterweight 3 need to be installed and provide additional bit pressure for drilling.Preventing sticking three wings are scraped
After knife drill bit assembly is installed, drill bit continues to install drilling rod to protelum not in contact with bottom hole；Bit contact bottom hole at this time, the
The ten section drilling rods super casing top 1.2m in the top.Occur bit freezing phenomenon when being drilled into bottom hole pitch casing top 55.2m, and drilling rod and drill bit without
Method proposes.At this point, mention brill in rotary drill rod, 2 bottom of screw cone, one lap welding has an alloy cutting tooth 21, alloy cutting tooth 21 at
Tooth shape can effectively be ground blocking part；Drill bit assembly top is promoted to fall by mud hole 24 when rotation mentions brill
Sand body and Karst Cave Formation in the boring mud that is ground of alloy cutting tooth 21 more readily flow into bottom hole；To which drill bit can be effective
And rapidly propose, save the construction time.Conventional process mode generally takes upper and lower cleaning bottom of hole, the mode of borehole cleaning solves bit freezing and asks
Topic, according to having experienced technology people, conventional process mode generally requires 24-36h in the case of this, or even can not solve then in addition
Selection loses higher underwater demolition mode and mentions brill.It is burn-on after alloy cutting tooth 21 on drill bit, it is practical to solve the bit freezing time and be
1-3h saves a large amount of construction time, while saving because of the human cost and machine cost caused by handling bit freezing.
Claims (2)
1. a kind of construction method for preventing cast-in-situ bored pile bit freezing, which comprises the following steps:
The first step prepares each component part of drill bit assembly and each component part of drill bit assembly is hung to drilling machine after drilling machine positioning
Position that is other and facilitating lifting；
The drill bit assembly includes drill bit connecting rod, screw cone, counterweight, three wings drag bit, in which: is set in drill bit connecting rod
There is connecting rod slurry channel, screw cone is connected with drill bit connecting rod, and the outer surface of screw cone is equipped with spiral cutting item, adjacent
Spiral cutting item between form spiral grooves, mud hole is provided in spiral grooves, counterweight is set under screw cone
Side, counterweight are equipped with counterweight slurry channel, and counterweight slurry channel is connected with connecting rod slurry channel, are additionally provided in counterweight vertical
Measuring device is spent, three wings drag bit is installed on the lower section of counterweight, and three wings drag bit includes a conduit, conduit and connecting rod mud
Slurry channel and counterweight slurry channel match, and three center is on a vertical line；One drill bit skeleton is installed on conduit, is bored
Point is set to the bottom of conduit, and apex point is equipped with alloy cutting blocks；
Second step positions three wings drag bit: three wings drag bit being hung to alignment hole center by loop wheel machine, passes through three wings
The detent ring flange being arranged on drag bit is stuck on drilling machine platform, so that three wings drag bit is stably placed at drilling machine platform
On；
Third step installs counterweight: counterweight being hung to the top of three wings drag bit by loop wheel machine, adjusts the position of counterweight, then
Counterweight is connect with three wings drag bit, is stuck on drilling machine platform by the counterweight rectangular cam being arranged in counterweight, so that counterweight
It is stably placed on drilling machine platform with three wings drag bit assemblies；
4th step, install drill bit connecting rod and screw cone: screw cone is fully welded in the side of drill bit connecting rod, and the two forms one
A overall structure；Drill bit connecting rod is hung to the top of counterweight by loop wheel machine, using the position of loop wheel machine adjustment drill bit connecting rod, so
Drill bit connecting rod is stuck on drilling machine platform with reconnection by the connecting rod rectangular cam being arranged in drill bit connecting rod afterwards,
So that entire drill bit assembly is stably placed on drilling machine platform；
Drilling rig power plant is connect by the 5th step with drill bit connecting rod；
6th step detects verticality: by the verticality measurement device being arranged in counterweight, detecting the verticality of drill bit assembly, and
It is adjusted by the tight condition of control drilling rig power plant and screw；
7th step, jointed rod: the connection of power device of rigging down and drill bit connecting rod, and by drilling rig power plant with it is next
Drilling rod connection is saved, then drilling rod is adjusted to above drill bit connecting rod, drilling rod and drill bit connecting rod are connected and fixed；
8th step, hitch up after bit contact bottom hole.
2. a kind of construction method for preventing cast-in-situ bored pile bit freezing according to claim 1, it is characterised in that:
The first step prepares each component part of drill bit assembly, and shield-tube embedment finishes, after drilling machine positioning, by each group of drill bit assembly
At the position for being partially hung to by drilling machine and facilitating lifting；
The drill bit assembly includes drill bit connecting rod, screw cone, counterweight, three wings drag bit, in which: is set in drill bit connecting rod
There is connecting rod slurry channel, screw cone is connected with drill bit connecting rod, and the outer surface of screw cone is equipped with spiral cutting item, adjacent
Spiral cutting item between form spiral grooves, mud hole is provided in spiral grooves, counterweight is set under screw cone
Side, counterweight are equipped with counterweight slurry channel, and counterweight slurry channel is connected with connecting rod slurry channel, are additionally provided in counterweight vertical
Measuring device is spent, three wings drag bit is installed on the lower section of counterweight, and three wings drag bit includes a conduit, conduit and connecting rod mud
Slurry channel and counterweight slurry channel match, and three center is on a vertical line；One drill bit skeleton is installed on conduit, is bored
Point is set to the bottom of conduit, and apex point is equipped with alloy cutting blocks；
Second step, position three wings drag bit: strictive drill platform opens, and three wings drag bit is hung to alignment hole by loop wheel machine
Center, suspension hook move down, until the detent ring flange of three wings drag bit shrinks drilling machine platform, at this time close to drilling machine platform
Just detent ring flange is stuck on drilling machine platform, so that three wings drag bit is steadily placed；
Third step is dismantled lifting rope and snap ring on drill bit, and is transferred in counterweight, counterweight to be hung；
4th step installs counterweight: according to third step, counterweight being hung to the top of three wings drag bit by loop wheel machine, utilizes loop wheel machine
The position of adjustment counterweight makes the lower flange disk of counterweight be directed at drill bit ring flange, and the miscellaneous of cleaning flange panel surface is needed before connection
Object or anvil cinder avoid connecting portion from gap occur, and then lead to inclined hole；Screw is passed through to counterweight lower part screw hole and three wings together
The drill screw hole of drag bit, puts on each nut, using manpower or mechanical force by screw tightening；
5th step, after counterweight installs, drilling machine platform opens, and counterweight and three wings drag bit assemblies are moved down with suspension hook, to
Counterweight rectangular cam shrinks drilling machine platform close to drilling machine platform, and counterweight rectangular cam is stuck on drilling machine platform, and counterweight and three wings are scraped
Knife drill bit assembly is steadily placed；
6th step shifts suspension centre: lifting rope and snap ring in disassembly counterweight, and is transferred in drill bit connecting rod, drill bit connection to be hung
Bar；
7th step, install drill bit connecting rod and screw cone: screw cone is fully welded in the side of drill bit connecting rod, and the two forms one
A overall structure；Drill bit connecting rod is hung to the top of counterweight by loop wheel machine, the position using loop wheel machine adjustment drill bit connecting rod makes
It obtains connecting rod lower flange disk and is directed at counterweight upper flange disk；Screw is passed through to connecting rod screw hole and counterweight top screw together
Hole puts on each nut, using manpower or mechanical force by screw tightening；At this point, drill bit connecting rod is installed together with screw cone
In counterweight, rigid preventing sticking three wings drag bit assemblies are integrally formed, and the center of three is located on a vertical line；
8th step, fixed drill bit connecting rod: after drill bit connecting rod installs, drilling machine platform opens, entire preventing sticking three wings scraper
Drill bit assembly is moved down with suspension hook, to connecting rod rectangular cam close to drilling machine platform, shrinks drilling machine platform, connecting rod rectangle is convex
Block is stuck on drilling machine platform, and preventing sticking three wings drag bit assemblies are steadily placed；
9th step connects drill bit connecting rod and drilling rig power plant: lifting rope and snap ring in disassembly drill bit connecting rod connect drill bit
Extension bar is connect with drilling rig power plant；Drilling rig power plant is fixed on drilling machine truss, can be carried out up and down by upper and lower telescopic rod
It is mobile；
Tenth step, detect verticality: drilling machine platform opens, and promotes drill bit assembly using telescopic rod above and below drilling machine, will be in counterweight
Three spirit level horizontals are placed on three and shelve on plate；Whether the bubble observed in three level meters is placed in the middle, illustrates when not placed in the middle
Verticality is poor, is adjusted, can be then carried out after placed in the middle in next step by the tight condition of control power head and inspection screw
Suddenly；
11st step connects next section drilling rod: screw and spiral shell of the dismantling connection in the upper connecting rod ring flange of drilling rig power plant
The upper flanges disk of next section drilling rod is connect by cap with drilling rig power plant, and next section drilling rod is adjusted in drill bit connecting rod
Side, the screw hole and connecting rod top screw hole being aligned on next section drilling rod put on each nut, will using manpower or mechanical force
Screw tightening；
12nd step repeats the 11st step, until hitch up after bit contact bottom hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810009375.2A CN108222843B (en) | 2018-01-05 | 2018-01-05 | A kind of construction method preventing cast-in-situ bored pile bit freezing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810009375.2A CN108222843B (en) | 2018-01-05 | 2018-01-05 | A kind of construction method preventing cast-in-situ bored pile bit freezing |
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| CN108222843B true CN108222843B (en) | 2019-05-14 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108915601B (en) * | 2018-09-04 | 2023-12-19 | 上海公路桥梁（集团）有限公司 | Drill bit for bored pile |
| CN110080218A (en) * | 2019-04-08 | 2019-08-02 | 中国葛洲坝集团第五工程有限公司 | The interim build-in basement rock construction method of steel pile casting |
| CN110886577B (en) * | 2019-11-29 | 2021-06-04 | 深圳宏业基岩土科技股份有限公司 | Construction method for perpendicularity control of rotary excavating hard secant pile in deep and thick rockfill area |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2110704U (en) * | 1991-12-31 | 1992-07-22 | 广东省水利水电机械施工公司 | Dill bit for enlarging bottom of pouring pile |
| GB2368359A (en) * | 2000-10-23 | 2002-05-01 | Baker Hughes Inc | Rotary/drag bit with optimised secondary/backup cutters |
| GB2363415B (en) * | 1997-09-19 | 2002-06-26 | Baker Hughes Inc | Earth-boring drill bits with enhanced formation cuttings removal features |
| CN205154025U (en) * | 2015-11-06 | 2016-04-13 | 宁波易通建设有限公司 | Drill bit that construction drilling bored concrete pile was used |
-
2018
- 2018-01-05 CN CN201810009375.2A patent/CN108222843B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2110704U (en) * | 1991-12-31 | 1992-07-22 | 广东省水利水电机械施工公司 | Dill bit for enlarging bottom of pouring pile |
| GB2363415B (en) * | 1997-09-19 | 2002-06-26 | Baker Hughes Inc | Earth-boring drill bits with enhanced formation cuttings removal features |
| GB2368359A (en) * | 2000-10-23 | 2002-05-01 | Baker Hughes Inc | Rotary/drag bit with optimised secondary/backup cutters |
| CN205154025U (en) * | 2015-11-06 | 2016-04-13 | 宁波易通建设有限公司 | Drill bit that construction drilling bored concrete pile was used |
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