CN104631439B - A kind of Pump breath countercirculate pile foundation construction device and method - Google Patents
A kind of Pump breath countercirculate pile foundation construction device and method Download PDFInfo
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- CN104631439B CN104631439B CN201410853874.1A CN201410853874A CN104631439B CN 104631439 B CN104631439 B CN 104631439B CN 201410853874 A CN201410853874 A CN 201410853874A CN 104631439 B CN104631439 B CN 104631439B
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Abstract
The invention discloses Pump breath countercirculate pile foundation construction device and method, belong to piling Technology field.This Pump breath countercirculate device includes convolution rig, reacting cycle gravel pump, slag absorbing flexible pipe, mud purifying device, sedimentation tank and the circulatory pool being sequentially communicated；Convolution rig includes drill bit, drilling rod, drive link, rotating disk and hydraulic motor, the bottom Flange joint of drill bit and drilling rod, the top of drilling rod and the bottom Flange joint of drive link, the top of drive link is fixed through rotating disk, the top of drive link is connected with the side of reacting cycle gravel pump by swivelling union, reacting cycle gravel pump and the hose connection place of slag absorbing are provided with faucet, and slag absorbing flexible pipe is fixed with faucet, mud purifying device respectively and is connected.This construction method comprises the steps: to be initially formed reacting cycle；Secondly start to creep into after reacting cycle to be formed, until forming stake holes；Finally after stake holes is formed, carry out the construction of clear hole.This device reduces the power of gravel pump, improves pore-forming efficiency.
Description
Technical field
The invention belongs to piling Technology field, particularly relate to a kind of Pump breath countercirculate pile foundation construction device and
Method.
Background technology
Cast-in-situ bored pile forms stake holes generally by machine drilling in ground, then places steel in stake holes
Muscle cage concrete perfusion form.But, cast-in-situ bored pile pile foundation is easy during silty sand ground drilling construction
Cause the phenomenon such as collapse hole, necking down, and sand factor height also can affect pile quality.Traditional handicraft uses back
Rotary drill Drilling by inverse circulation method carries out drilling construction.It is illustrated in figure 1 direct circulation drilled as holes in traditional handicraft to fill
Note pile driving construction schematic diagram, 1.-gravel pump in figure, 2.-faucet, 3.-hollow drill, 4.-rig revolution dress
Put 5.-sedimentation tank, 6.-mud pit, 7.-drill bit, 8.-mud loop direction.As can be seen from the figure: just
Circulation forming hole method is to drive drilling rod and the broken ground of bit cutting by slewing equipment, and passes through mud
Inputting the inner chamber of hollow drill after pumping mud, then this mud exports at the bottom of stake holes through the grout outlet of drill bit
Portion.During pore-forming, mud is injected by drilling rod is internal, sprays, carry the boring mud being cut along stake holes bottom drilling rod
Sedimentation tank is taken and flowed into wall upwards out of through stake holes mouth, and the mud after precipitation flows into mud-settling pit and purifies, and purifies
After mud reinject drilling rod, so circulate.But, in traditional handicraft, gravel pump is independently arranged, to pump
Power requirement is high, and whole pumped loop needs airtight, inefficient and electric quantity consumption is big.Therefore, how to provide
A kind of work efficiency is high, the Pump breath countercirculate pile foundation construction device and method of energy saving, is art technology
Personnel need the technical barrier of solution badly.
Summary of the invention
It is an object of the invention to provide that a kind of pore-forming efficiency is high, good and energy saving the pumping of pile quality is anti-
Circulation pile foundation construction device and method, to solve to want because gravel pump is independently arranged the power to pump in traditional handicraft
Asking high, whole pumped loop needs airtight, the problem that pore-forming efficiency is the highest and electric quantity consumption is big.
To achieve these goals, the technical scheme is that
A kind of Pump breath countercirculate pile foundation construction device, it is adaptable to carry out drill-pouring in deep powder sand soil
Stake drilling construction, including the convolution rig being sequentially communicated, reacting cycle gravel pump, slag absorbing flexible pipe, mud purification
Device, sedimentation tank and circulatory pool；Described convolution rig include drill bit, drilling rod, drive link, rotating disk with
And hydraulic motor, the bottom of described drill bit and described drilling rod is fixing to be connected, the top of described drilling rod and described biography
The bottom of lever is fixed, and the top of described drive link is through described rotating disk and connects and fixes, described drive link
Top be connected with the side of described reacting cycle gravel pump by swivelling union, described reacting cycle gravel pump and
The hose connection place of described slag absorbing is provided with faucet, described slag absorbing flexible pipe respectively with described faucet, described mud
Purifier is fixing to be connected, and described in described fluid motor-driven, rotating disk rotates.
Further, described convolution rig also includes that one is arranged at the base above described pile foundation, described liquid
Pressure motor is arranged on described base, and described base is additionally provided with the through hole passed for described drive link.
Further, also include that a slurrying pond, described slurrying pond connect with described circulatory pool.
Further, described drill bit is the double waist hoop drill bits of three wings, and the diameter of described drill bit is more than described stake diameter
20mm。
Further, described mud purifying device is sand removing machine.
A kind of cast-in-situ bored pile pile base construction method, comprises the steps:
Step one: Pump breath countercirculate pile foundation construction device is provided；
Step 2: first described drill bit is improved at the bottom of distance stake holes 30～50cm, and in described stake holes
The a certain amount of mud of interior injection, then starts described reacting cycle gravel pump and described rotating disk, and make described instead
Circulating sand pump idle running certain time, until forming reacting cycle；
Step 3: start to creep into after described reacting cycle to be formed, until forming described stake holes；
Step 4: after described stake holes is formed, carries out the construction of clear hole.
Further, when starting drilling construction in described step 3, described convolution rig gently presses slow-speed, along with deeply
Degree increases and suitably increases pressure and speed, after described drill bit fully enters stratum, further accelerates and creeps into.
Further, stake holes inwall described in described step 3 forms mud off.
Further, in described mud off, the proportion of mud is 1.10～1.15, and viscosity is 20～25s, contains
Sand coarse aggregate ratio ＜ 5%.
Further, in described step 4, the construction of clear hole includes the first step and second step,
The first step: after described stake holes is formed, described drill bit is mentioned 45cm～55cm, and keep mud
Normal circulation so that proportion is 1.05～1.15, viscosity be 17～20s mud ostium in, protect simultaneously
Holding described stake water level in borehole and exceed more than level of ground water 0.5m, until filling described stake holes, completing for the first time
The construction of clear hole；
Second step: after having laid steel reinforcement cage and conduit in staying in described stake holes, according to the side of the described first step
Method carries out second time clear hole construction.
The present invention compared with prior art, has the advantage that and beneficial effect:
1, the Pump breath countercirculate pile foundation construction device of the present invention, it is adaptable to carry out in deep powder sand soil
Drilling pouring pile hole is constructed.Convolution rig that Pump breath countercirculate pile foundation construction device includes being sequentially communicated, anti-
Circulating sand pump, slag absorbing flexible pipe, mud purifying device, sedimentation tank and circulatory pool；Convolution rig includes boring
Flange is passed through in the bottom of head, drilling rod, drive link, rotating disk, hydraulic motor and base, drill bit and drilling rod
Connecting, the top of drilling rod is by the bottom Flange joint of flange with drive link, and the top of drive link is through rotating
Dish also connects and fixes, and the top of drive link is connected by the side activity of swivelling union with reacting cycle gravel pump
Connecing, reacting cycle gravel pump and the hose connection place of slag absorbing are provided with faucet, slag absorbing flexible pipe respectively with faucet, mud
Slurry purifier is fixing to be connected, and fluid motor-driven rotating disk rotates.By being arranged at the transmission of convolution rig
The pump-absorb action of the reacting cycle gravel pump above bar forms negative pressure, in stake holes at the drilling rod inner chamber of convolution rig
Under the effect of fluid column and atmospheric pressure, at the bottom of the mud flow stake holes of stake holes wall and annulus, by convolution rig
The boring mud that bit cutting gets off brings the drilling rod inner chamber of convolution rig into, and then the mud with boring mud follows through counter
Ring gravel pump drains into after mud purifying device carries out desanding and enters back into the sedimentation tank being positioned at ground.In sedimentation tank
Removing the mud after boring mud and pump into circulatory pool by slush pump, the mud after circulatory pool purifies is by chute again
Flow in stake holes, thus form reacting cycle.By arranging reacting cycle gravel pump, significantly shorten whole pumping
Loop, reduces the power of gravel pump, improves the suction to mud in hole and boring mud, accelerates pore-forming speed
Degree, thus solve in tradition normal circulation technology high to the power requirement of gravel pump, whole pumped loop needs close
Close, the problem that pore-forming efficiency is the highest and electric quantity consumption is big.
2, the bored pile construction method that the present invention provides, comprises the steps: first to be improved by drill bit
At a certain distance from the bottom of distance stake holes, and in stake holes, inject a certain amount of mud, then start reacting cycle sandstone
Pump and rotating disk, and reacting cycle gravel pump is dallied certain time, until forming reacting cycle；Next treats shape
Start to creep into after becoming reacting cycle, until forming stake holes；Finally after stake holes is formed, carry out the construction of clear hole.?
During deep silty sand ground bored pile construction, the Pump breath countercirculate pile foundation construction device of the present invention is used to enter
When row pore-forming is constructed with clear hole, the pore-forming time is greatly shortened, and sediment energy at the bottom of mud balance, sand factor, hole
Preferably controlled, it is ensured that pile quality.
Accompanying drawing explanation
The Pump breath countercirculate pile foundation construction device and method of the present invention is given by below example and accompanying drawing.
Fig. 1 is direct circulation drilled as holes filling pile construction schematic diagram in prior art；
Fig. 2 is the structural representation of one embodiment of the invention Pump breath countercirculate pile foundation construction device.
Detailed description of the invention
The Pump breath countercirculate pile foundation construction device that the present invention proposed below in conjunction with the drawings and specific embodiments and
Method is described in further detail.According to following explanation and claims, advantages and features of the invention will
Become apparent from.Need to additionally illustrate, accompanying drawing all uses the form simplified very much and all uses non-ratio accurately,
Only in order to facilitate, to aid in illustrating lucidly the purpose of the embodiment of the present invention.For sake of convenience, described below
" on ", the upper and lower direction of D score and accompanying drawing consistent, but this can not become technical solution of the present invention
Limit.
In the present embodiment, at pre-construction pile foundation, geological condition is shown as according to geologic report: it is thick that pile foundation passes through soil layer
Degree be 6.1～18.4m 5. layer silty sand ground and soil thickness be 1.65～36.75m the 9. layer flour sand
Layer.Therefore, the present embodiment pile foundation has aperture big (maximum pile foundation 1.8m), becomes hole depth (maximum hole depth
Feature 60m), and need during pore-forming to pass through nearly 40 meters of silty sand ground thickness, it follows that need deep
Powder sand soil carries out drilling pouring pile hole construction.According to traditional positive circulating boring pile construction
Method is constructed, it may be difficult to ensure pile quality.For using in foregoing problems, this enforcement, pumping is counter to be followed
Ring pile foundation construction device is constructed, thus while meeting raising pore-forming efficiency, reduces slagging thickness at the bottom of hole
And holding wall stability, so that it is guaranteed that pile quality meets the requirements.
Embodiment one
The Pump breath countercirculate pile foundation construction device of the present invention is described in detail below in conjunction with Fig. 2.
A kind of Pump breath countercirculate pile foundation construction device, it is adaptable to carry out drill-pouring in deep powder sand soil
Stake drilling construction, including the convolution rig 1 being sequentially communicated, reacting cycle gravel pump 2, slag absorbing flexible pipe 3, mud
Slurry purifier 4, sedimentation tank 5 and circulatory pool 6；Convolution rig 1 includes drill bit 10, drilling rod 11, passes
Lever 12, rotating disk 13, hydraulic motor 14 and be arranged at the base 15 above pile foundation, on base 15
Being provided with the through hole passed for drive link 12, hydraulic motor 14 is arranged on base 15, drill bit 10 and drilling rod
The bottom of 11 connects by flange is fixing, and the top of drilling rod 11 is solid by flange with the bottom of drive link 12
Fixed connection, the top of drive link 12 is through rotating disk 13 and connects and fixes, and the top of drive link 12 is passed through
Swivelling union 7 is flexibly connected with the side of reacting cycle gravel pump 2, reacting cycle gravel pump 2 and slag absorbing flexible pipe
3 junctions are provided with faucet 21, and slag absorbing flexible pipe 3 is fixed with faucet 21, mud purifying device 4 respectively
Connecting, hydraulic motor 14 drives rotating disk 13 to rotate.
With continued reference to Fig. 2, specifically, in order to improve mud in stake holes and the suction of disintegrating slag (boring mud),
Accelerating speed of fulfiling hole, the rig 1 that circles round in the present embodiment selects moment of torsion big, the GPS-20 type work that frame is stable
Journey rig, and the frame of this rig is carried out local flow improvement, between faucet 10 and swivelling union 7
Set up 6BS type reacting cycle gravel pump 2.The operation principle of Pump breath countercirculate pile foundation construction device: followed by counter
The pump-absorb action of ring gravel pump 2 forms negative pressure at the inner chamber of drilling rod 11, fluid column and atmospheric pressure in stake holes
Under effect, at the bottom of the mud flow stake holes of stake holes wall and annulus, the boring mud band that drill bit 10 is cut
Entering the inner chamber of drilling rod 11, then the mud with boring mud drains into mud purification dress through reacting cycle gravel pump 2
Put 4 carry out desanding after enter back into the sedimentation tank 5 being positioned at ground.Sedimentation tank 5 is removed the mud after boring mud
Circulatory pool 6 is pumped into, the mud fluid after circulatory pool 6 purifies by slush pump (not shown)
Flowed to again in stake holes by chute (not shown), form reacting cycle.Flow to after circulatory pool 6 purifies
Mud in stake holes forms mud off.Mud off refers to that mud is to hole in cast-in-situ bored pile borehole engineering
The mud micromicro that the static pressure of wall and mud are formed on hole wall is to be effectively prevented the work of hole wall collapse or peeling
With, and maintain the shape invariance of the stake holes being drilled to.Additionally, mud also has takes slag and cooling, lubrication rig
Effect, there is the mud of certain viscosity and can take same body refuse and discharge together.Especially, due to drilling rod 11
Internal diameter be far smaller than stake holes internal diameter, therefore by the pump-absorb action of reacting cycle gravel pump 2, with the mud of boring mud
The speed that slurry rises in drilling rod 11 is significantly faster than normal circulation technology.And, compared with normal circulation technology,
By using, the Pump breath countercirculate pile foundation construction device of the present embodiment carries out drilling pouring pile hole, clear hole is executed
Work, can not only improve rate of penetration, moreover it is possible to reduces the consumption of mud, also reduces rotating disk 13 simultaneously
The power consumed so that the clear hole time, stake holes quality that is fast and that formed was good.By following counter in the present embodiment
Ring gravel pump 2 is arranged at above drive link 12, shortens pumping path, improves pumping efficiency, thus
Further increase pore-forming, the efficiency in clear hole.
With continued reference to Fig. 2, in order to meet perpendicularity requirement, drill bit 10 is the double waist hoop drill bits of three wings.Drill bit
The diameter 20mm bigger than the diameter of cast-in-situ bored pile of 10, to tackle shrinkage cavity phenomenon in sandy soil layer.Certainly,
In order to draw materials conveniently, mud purifying device 4 can select sand removing machine.Such as select ZX-250 type sand removing machine
Circulating mud is carried out desanding, desanding particle grades 0.075mm, disposal ability 250m3/h.Examination pore-forming with
And soil layer grittiness bigger time, between circulatory pool 6 and stake holes, be additionally provided with a slurrying pond (not shown), system
Stock tank connects with circulatory pool 6.
Embodiment two
Continue with and combine Fig. 2 and specifically utilize Pump breath countercirculate constructing device to carry out cast-in-situ bored pile pile foundation
The method of construction.Cast-in-situ bored pile pile base construction method, comprises the steps:
Step one, provide a Pump breath countercirculate pile foundation construction device, and debug preparation, mud is set simultaneously and follows
Loop systems.
Convolution rig 1 that Pump breath countercirculate pile foundation construction device includes being sequentially communicated, reacting cycle gravel pump 2,
Slag absorbing flexible pipe 3, mud purifying device 4, sedimentation tank 5 and circulatory pool 6；Convolution rig 1 includes drill bit
10, drilling rod 11, drive link 12, rotating disk 13, hydraulic motor 14 and be arranged at the end above pile foundation
Seat 15, base 15 is provided with the through hole passed for drive link 12, and hydraulic motor 14 is located on base 15,
The bottom method of Flange joint, the top of drilling rod 11 and drive link 12 is passed through in the bottom of drill bit 10 and drilling rod 11
Blue connection, the top of drive link 12 is through rotating disk 13 and connects and fixes, and the top of drive link 12 is passed through
Swivelling union 7 is flexibly connected with the side of reacting cycle gravel pump 2, reacting cycle gravel pump 2 and slag absorbing flexible pipe
3 junctions are provided with faucet 21, and slag absorbing flexible pipe 3 is fixed with faucet 21, mud purifying device 4 respectively
Connecting, hydraulic motor 14 drives rotating disk 13 to rotate.Mud circulating system method to set up is: first will be heavy
Pond, shallow lake 5, circulatory pool 6 and slurrying pond (not shown) divide storehouse to arrange, and the capacity in each storehouse should meet construction
The needs of period mud sediment amount, and remove precipitate in storehouse in time.Secondly, circulating mud need to be by circulation
The mud purifying device 4 that pond 6 is provided above, to reduce sand factor.3rd, by increasing circulating mud stream
Through the length of route, reduce the content of Extra-fine sand in mud further.So far, the beam worker of drilling construction
Complete.
Step 2, first drill bit 10 is improved to distance stake holes at the bottom of 30～50cm place, and in stake holes injection
A certain amount of mud, then starts reacting cycle gravel pump 2 and rotating disk 13, and makes reacting cycle gravel pump 2
Idle running certain time, until forming reacting cycle.
Step 3: start to creep into after reacting cycle to be formed, until forming stake holes.
Specifically, according to different geology characteristics, rationally select drilling parameter, for argillic horizon, preferably use
Medium-to-high grade, suitably reduce the pressure of the drill, accelerate rate of penetration, such as: 40～70 revs/min.For sandy soils,
Preferably using low and middle-grade, suitably increase the pressure of the drill, slow down drilling speed, such as: less than 40 revs/min.Meanwhile, pass through
The mud that circulatory pool 6 flows to after purifying in stake holes forms mud off.The quality of quality of mud fluid directly influences
Hole quality and the performance of bearing capacity of pile foundation.Thicker owing to existing in stratum at plan construction drill bored concrete pile pile foundation
Silty sand ground, for reducing hole wall collapse and the situation of necking down, in mud off, the proportion of mud is
1.10～1.15, viscosity is 20～25s, sand factor ＜ 5%.And, when reacting cycle gravel pump 2 discharge
When boring mud amount reduces or in water outlet, dregginess is more, rate of penetration should be controlled.The rig 1 that circles round during perforate is gently pressed
Slow-speed, increases along with the degree of depth and suitably increases pressure and speed, uses denseer mud when soil property unconsolidated formation
Slurry retaining wall, and slow down rate of penetration and rotating speed, the slow-motion of light brill is to control collapse hole.Subject-oriented position or drill bit
After 10 fully enter stratum, can accelerate to creep into.
Step 4: after stake holes is formed, carries out the construction of clear hole.
The construction of clear hole is carried out at twice, and the most clear hole is carried out after pore-forming, and the clear hole of second time is at reinforcing bar
Carry out after cage and catheter installation.For effective cleaning hole bed mud sand, secondary pile hole cleaning all uses Pump breath countercirculate
Technique.
Clear hole construction procedure:
The first step: after stake holes is formed, drill bit 10 is mentioned 45cm～55cm, and keeps normally following of mud
Ring so that the mud that proportion is 1.05～1.15, viscosity is 17～20s flows in stake holes, keeps stake simultaneously
Water level in borehole exceeds more than level of ground water 0.5m, until filling stake holes, completes the construction of the most clear hole.Also
That is, carry out the most clear hole behind whole hole immediately, special messenger should be provided with during clear hole and fish for boring mud, to add
The speed in fast clear hole.The clear hole time is as the criterion with oleo stock in having changed hole, and makees mud Indexs measure at any time, sampling
Preferably carry out from plasma discharge mouth, the same oleo stock of mud index.During clear hole in boring casing mud water level it should be noted that keep steady
Fixed, to prevent drill hole caves.The clear hole time determines according to measurement precipitation thickness during mud balance and clear hole,
The clear hole time controls formula: h=V/Q, wherein: the h-clear hole time；V-stake holes volume, Q: reacting cycle
Gravel pump flow.Drill bit is carried to input in about 0.5m at the bottom of hole, clear hole hole when by the most clear Kong Shiying
Mud amount is no less than reacting cycle gravel pump discharge capacity, it is ensured that the mud amount of supplying, and answers conservative control pump amount simultaneously,
Avoid inhaling collapse hole wall.
Second step: after having laid steel reinforcement cage and conduit in staying in stake holes, enter according to the method for the described first step
The clear hole construction of row second time.
After completing twice clear hole, in mud off, the proportion of mud is 1.05～1.10, and viscosity is
17～20s, sand factor ＜ 1%, sediment thickness ＜ 0.2D (D is the diameter of cast-in-situ bored pile), stake holes is vertical
Degree ＜ 1%.
In sum, the Pump breath countercirculate pile foundation construction device of the present invention, it is adaptable at deep powder sand soil
In carry out drilling pouring pile hole construction.Pump breath countercirculate pile foundation construction device includes the abrasion drill being sequentially communicated
Machine, reacting cycle gravel pump, slag absorbing flexible pipe, mud purifying device, sedimentation tank and circulatory pool.By arranging
The pump-absorb action of the reacting cycle gravel pump above the drive link of convolution rig is at the drilling rod inner chamber of convolution rig
Form negative pressure, in stake holes under the effect of fluid column and atmospheric pressure, stake holes wall and the mud flow stake of annulus
At the bottom of hole into, the boring mud that gets off of bit cutting of convolution rig is brought the drilling rod inner chamber of convolution rig, then with
The mud of boring mud drains into enter back into after mud purifying device carries out desanding through reacting cycle gravel pump and is positioned at ground
Sedimentation tank in.Sedimentation tank is removed the mud after boring mud and pumps into circulatory pool by slush pump, clean through circulatory pool
Mud after change is flowed in stake holes by chute again, thus forms reacting cycle.At deep silty sand ground drill-pouring
During pile driving construction, when using the Pump breath countercirculate pile foundation construction device of the present invention to carry out pore-forming with clear hole, become
The hole time is greatly shortened, and at the bottom of mud balance, sand factor, hole, sediment can preferably be controlled so that pile
Quality fully ensures that.Bored pile construction method, by arranging reacting cycle gravel pump, shortens significantly
Whole pumped loop, reduces the power of gravel pump, improves the suction to mud in hole and boring mud, accelerates
Speed of fulfiling hole, thus solve in tradition normal circulation technology high to the power requirement of gravel pump, whole pumping
Loop needs airtight, the problem that pore-forming efficiency is the highest and electric quantity consumption is big.
Foregoing description is only the description to present pre-ferred embodiments, not any limit to the scope of the invention
Fixed.Any change that those skilled in the art does according to the disclosure above content, modification, belong to right and want
The protection domain asked.
Claims (10)
1. a Pump breath countercirculate pile foundation construction device, it is adaptable to carry out drill-pouring in deep powder sand soil
Stake drilling construction, it is characterised in that the convolution rig that includes being sequentially communicated, reacting cycle gravel pump, suction
Slag flexible pipe, mud purifying device, sedimentation tank and circulatory pool；Described convolution rig includes drill bit, brill
Bar, drive link, rotating disk and hydraulic motor, the bottom of described drill bit and described drilling rod is fixing to be connected,
The bottom of the top of described drilling rod and described drive link is fixed, and the top of described drive link passes described rotation
Rotating disk also connects and fixes, and the top of described drive link is by swivelling union and described reacting cycle gravel pump
Side connect, described reacting cycle gravel pump and the hose connection place of described slag absorbing are provided with faucet, described
Slag absorbing flexible pipe is fixed with described faucet, described mud purifying device respectively and is connected, described hydraulic motor
Described rotating disk is driven to rotate.
2. Pump breath countercirculate pile foundation construction device as claimed in claim 1, it is characterised in that described abrasion drill
Machine also includes that one is arranged at the base above described pile foundation, and described hydraulic motor is arranged at described base
On, described base is additionally provided with the through hole passed for described drive link.
3. Pump breath countercirculate pile foundation construction device as claimed in claim 1 or 2, it is characterised in that also include
One slurrying pond, described slurrying pond connects with described circulatory pool.
4. Pump breath countercirculate pile foundation construction device as claimed in claim 1, it is characterised in that described drill bit is
The double waist hoop drill bit of three wings, the diameter of described drill bit is more than described stake diameter 20mm.
5. Pump breath countercirculate pile foundation construction device as claimed in claim 1, it is characterised in that described mud is clean
Makeup is set to sand removing machine.
6. a cast-in-situ bored pile pile base construction method, it is characterised in that comprise the steps:
Step one: the Pump breath countercirculate pile foundation construction dress as described in any one of claim 1 to 5 is provided
Put；
Step 2: first described drill bit is improved at the bottom of distance stake holes 30～50cm, and in stake holes
Inject a certain amount of mud, then start described reacting cycle gravel pump and described rotating disk, and make described counter follow
Ring gravel pump idle running certain time, until forming reacting cycle；
Step 3: start to creep into after described reacting cycle to be formed, until forming described stake holes；
Step 4: after described stake holes is formed, carries out the construction of clear hole.
7. cast-in-situ bored pile pile base construction method as claimed in claim 6, it is characterised in that described step 3
During middle beginning drilling construction, slow-speed gently pressed by described convolution rig, increases along with the degree of depth and suitably increases pressure
And speed, after described drill bit fully enters stratum, further accelerate and creep into.
8. cast-in-situ bored pile pile base construction method as claimed in claim 6, it is characterised in that described step 3
Described in stake holes inwall formed mud off.
9. cast-in-situ bored pile pile base construction method as claimed in claim 8, it is characterised in that described mud protects
In wall, the proportion of mud is 1.10～1.15, and viscosity is 20～25s, sand factor ＜ 5%.
10. cast-in-situ bored pile pile base construction method as claimed in claim 6, it is characterised in that described step 4
In the construction of clear hole include the first step and second step,
The first step: after described stake holes is formed, described drill bit is mentioned 45cm～55cm, and keeps mud just
Often circulation so that proportion is 1.05～1.15, viscosity be 17～20s mud ostium in, keep simultaneously
Described stake water level in borehole exceeds more than level of ground water 0.5m, until filling described stake holes, completes the most clear
Construct in hole；
Second step: after having laid steel reinforcement cage and conduit in staying in described stake holes, according to the side of the described first step
Method carries out second time clear hole construction.
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| CN201410853874.1A CN104631439B (en) | 2014-12-31 | 2014-12-31 | A kind of Pump breath countercirculate pile foundation construction device and method |
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| CN201410853874.1A CN104631439B (en) | 2014-12-31 | 2014-12-31 | A kind of Pump breath countercirculate pile foundation construction device and method |
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| CN104631439B true CN104631439B (en) | 2016-08-17 |
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