CN108867631A - A kind of construction method of rotary digging drilling hole bored concrete pile - Google Patents
A kind of construction method of rotary digging drilling hole bored concrete pile Download PDFInfo
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- CN108867631A CN108867631A CN201810887404.5A CN201810887404A CN108867631A CN 108867631 A CN108867631 A CN 108867631A CN 201810887404 A CN201810887404 A CN 201810887404A CN 108867631 A CN108867631 A CN 108867631A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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Abstract
The present invention relates to foundation basic construction technology, in particular to a kind of construction method of rotary digging drilling hole bored concrete pile includes the following steps：S1. drilling machine installation is in place；S2. simultaneously align piles position is determined；S3. casing is buried；S4. mud makes；S5. it drills；S6. borehole cleaning；S7. steel reinforcement cage and conduit are successively transferred：Conduit connection will seal straight, and mouth is from bottom hole 20cm~50cm under conduit；S8. pass through tremie placing concrete；Mud in step S4 is made of blender, and first plus water calculates volume, and bentonite is added under stiring, soda ash is added as a solution under stiring, mixing time is no less than three minutes, and the design parameter of mud is as follows after stirring：Specific gravity：1.04~1.18；Viscosity：18S~25S；Funnel method solid concentration：6%~8%；Colloidity：>95%；Sand factor：<2%；PH value：7~9.The sand content in mud that the present invention uses is low, reduces the abrasion of drilling bucket in boring procedure, and solid concentration is low, prove mud take slag ability it is stronger.
Description
Technical field
The present invention relates to foundation basic construction technology, in particular to a kind of construction method of rotary digging drilling hole bored concrete pile.
Background technique
Bored concrete pile be after a kind of pore-forming in place concrete perfusion or armored concrete and manufactured stake, common method have
Rotary digging drilling hole bored concrete pile, driven cast-in-place pile and explosive expansion bored concrete pile.
Rotary digging drilling hole bored concrete pile generally comprises following steps：S1. drilling machine installation is in place；S2. simultaneously align piles position is determined：Really
Fixed pile adjusts the mast of rotary drilling rig, and mast is made to be in plummet state, allows drilling bucket or augers to positive stake position； S3.
Embedded casing：Using stake position center as the center of circle, according to the radius of casing, casing position is made on the ground, casing is buried in the earth；
S4. mud makes：The mud being perfused when stirring production drilling；S5. it drills：A certain amount of mud is injected into casing, is made later
It is drilled downwards with rotary drilling rig；S6. borehole cleaning：Cleaning hole bottom sediment；S7. steel reinforcement cage and conduit are successively transferred；S8. by leading
Pipe casting concrete.
Wherein, effect of mud during rotary digging drilling hole is extremely important, is mainly used to the hole wall of protection drilling, maintains to bore
The equilibrium of stress inside and outside hole prevents drilling from caving in, and secondly can also play the role of taking slag, cooling drilling tool and lubrication.In publication No.
In the application for a patent for invention of CN106118620A, to disclose a kind of mud, specific parameter is：Specific gravity 1.05~1.15,
18~26S of viscosity, pH value 9~10, colloidity 98%.Disadvantage is that be likely to occur sand factor biggish for the mud of configuration
Situation is very big to the abrasion of drilling bucket when carrying out bore operation using mud in this way.
Summary of the invention
The object of the present invention is to provide a kind of construction method of rotary digging drilling hole bored concrete pile, having reached reduces mud to drilling bucket
Abrasion.
Above-mentioned technical purpose of the invention technical scheme is that：
A kind of construction method of rotary digging drilling hole bored concrete pile, includes the following steps：S1. drilling machine installation is in place；S2. it determines and is aligned
Stake position：True fixed pile adjusts the mast of rotary drilling rig, and mast is made to be in plummet state, allows drilling bucket or augers to positive stake
Position；S3. casing is buried：Using stake position center as the center of circle, according to the radius of casing, casing position is made on the ground, casing is buried
In burying, the internal diameter of casing is greater than boring aperture, and the height of casing is above the ground level；S4. mud makes：When stirring production drilling
The mud of perfusion；S5. it drills：A certain amount of mud is injected into casing, is drilled downwards using rotary drilling rig later, with mud
Loss and hole depth increase, and supplement mud into drilling in time；S6. borehole cleaning：Cleaning hole bottom sediment；S7. steel reinforcement cage is successively transferred
And conduit：Conduit connection will seal straight, and mouth is from bottom hole 20cm~50cm under conduit；S8. pass through tremie placing concrete；Step
Mud in rapid S4 is made of blender, and first plus water calculates volume, bentonite is added under stiring, under stiring with solution
Soda ash is added in form, and mixing time is no less than three minutes, and the design parameter of mud is as follows after stirring：Specific gravity：1.04~1.18
Viscosity：18S~25S funnel method solid concentration：6%~8% colloidity：>95% sand factor：<2% pH value：7~9.
By using above-mentioned technical proposal, the main function of mud is the hole wall of protection drilling, dimension during drilling
The equilibrium for holding the inside and outside stress that drills, prevents drilling from caving in, and secondly can also play the role of taking slag, cooling drilling tool and lubrication；Stirring
Parameter mud colloidity as above is high afterwards, viscosity is big, so that the soil of borehole sidewall is adhered to, be formed smooth
The intensity of hole wall, hole wall is higher, and anti-landslide ability is stronger；In addition mud balance is suitable, will not cause because mud balance is excessively high
Soil easily adheres on drilling tool when drilling, and the clod that can be avoided after cleaning suspends in turn result in mud and pouring
The case where being mingled with clod in concrete is caused during building；Sand factor is low, is reduction of the abrasion of drilling bucket, and solid concentration is low
Then prove mud take slag ability it is stronger, when being drilled in a word using above-mentioned mud, the flatness of drilling is high, be not easy to cave in,
It takes that slag ability is strong, is not likely to produce the adherency and suspension of clod.
Preferably, in step s 4, when making mud, fluid loss agent or blanc fixe are added during stirring.
The ratio of mud is needed in the case where brill digs sand gravel layer or hard stratum by using above-mentioned technical proposal
Weight is larger, is conducive to the pressure balance for maintaining drilling inside and outside in this way, and fluid loss agent is added at this time or blanc fixe is capable of increasing
Specific gravity, and large effect will not be caused to other parameters.
Preferably, in step s 4, when making mud, sawdust or acrylic staple fibre are added during stirring.
By using above-mentioned technical proposal, when boring digging stake holes in the stronger soil layer of water penetration, sawdust or acrylic fibers are added
Cotton can be blocked the infiltration gap of stake holes by sawdust or acrylic staple fibre, reduce the rate of spillage.
Preferably, step S5 the specific steps are：S51. drill bit lands, with the self weight of drill bit or additional pressurization
Pressure of the pressure of oil cylinder as drilling, rotary drilling-head, drilling；S52. after filling soil, sand in drilling bucket, drilling bucket is promoted
Come；S53. rotary rig draws off the soil in drilling bucket；S54. drilling bucket valve is closed, drilling machine is bored back in hole, land drilling rod,
Continue to creep into；S55. step S52~S54 is repeated, mud liquid level is kept in the process, with the loss and hole depth of mud
Increase, mud is supplemented into hole in time.
By using above-mentioned technical proposal, mud is replenished in time during boring and digging stake holes, guarantees that mud is filled in original
In stake holes, to maintain the pressure inside and outside stake holes, stake holes is avoided to cave in；The former mud in stake holes is dug by the brill of drilling bucket simultaneously, is made
Soil in drilling is mixed into mud, and the mud newly injected can dilute former mud, and the brill digging after being allowed to is more easier.
Preferably, in step s 4, bore when meeting Soft Soil Layer, selects longer bucket tooth and the big drilling bucket of space width, examined after mentioning brill
Bottom cutting tooth is looked into, clears up between cog foundry loam in time, replaces the bucket tooth of blunt.
By using above-mentioned technical proposal, the adhesive capacity of Soft Soil Layer is stronger, but is easy to bore and dig, therefore use longer bucket
Tooth bores digging ability to be promoted, and is then not easy to be adhered to soil on drilling bucket using the lesser drilling bucket of space width, and it is viscous to clear up between cog in time
Mud can then prevent the soil of adherency from packing phenomenon occur.
Preferably, in step s 4, bores and meet hard stratum and when every round trip drilling depth is small, disintegrating slag amount is few in drilling bucket, change one
Then the drilling bucket of a small diameter, one aperture of subdrilling use the drilling bucket reaming of appropriate diameter again.
By using above-mentioned technical proposal, the difficulty bored and dug is reduced, improves the efficiency bored and dug, while reducing the damage to drilling bucket
Wound.
Preferably, putting into appropriate clay into hole when boring chance sand gravel stratum, drilled using fishing sand drilling bucket.
It by using above-mentioned technical proposal, is put into after clay into stake holes, clay particle adsorbs colloidality substance, on surface
The big hydration shell of thicker plasticity is wrapped up, accumulates clay particle under differential pressure action, forms small thin of fine and close permeability
Mudcake, to reduce fluid loss.
Preferably, the speed of promotion or the decentralization of drilling bucket is as follows in step S5：When filling dregs for 0.5m/s~
0.75m/s, 0.83m/s when unloaded.
By using above-mentioned technical proposal, the speed of promotion or the decentralization of drilling bucket is unsuitable too fast, otherwise may cause
Landslide can then reduce efficiency slowly excessively.
In conclusion the present invention has the following technical effects：Specific gravity is added during drilling to be 1.04~1.18, glue
Degree is 18S~25S, funnel method solid concentration is 6%~8%, colloidity>95%, sand factor 2%, the mud that pH value is 7~9, reduce
The abrasion of drilling bucket in boring procedure, solid concentration is low, prove mud take slag ability it is stronger.
Specific embodiment
Invention is further described in detail below.
A kind of construction method of rotary digging drilling hole bored concrete pile, includes the following steps：
S1. drilling machine installation is in place.It is required that earth bearing strength be not less than 100Kpa, shoe sit crosslegged the position fallen answer it is smooth, it is in easy flights in 3 °,
It avoids generating power loss and tilt displacement because of place out-of-flatness, in addition also to avoid the center of gravity of drilling machine higher and cause safety
Accident.
S2. simultaneously align piles position is determined.True fixed pile with two mutually perpendicular straight line intersections in stake point, and makes cross
Mark and appropriate plus protection are carried out in control point；Later adjust rotary drilling rig mast, so that mast is in plummet state, allow drilling bucket or
Person's augers is to positive stake position.
S3. casing is buried.Using stake position center as the center of circle, according to the radius of casing, casing position is made on the ground, will be protected
Cylinder is buried in the earth, and the internal diameter of casing is greater than boring aperture, and the height of casing is above the ground level.After making cross pile, brill can be used
Machine carries out super hole cutter and keeps forging ahead soil, drilling to completion, by shield-tube embedment into the hole drilled out.Casing preferably uses the thickness of 10mm or more
Steel plate production, the diameter of casing should be greater than aperture 200mm effect, and the length of casing should regard strata condition reasonable selection, casing top
200mm above ground level or so is answered in portion, is filled and is tamped with clay around casing, and casing bottom should be located on stable soil layer,
Centre deviation is not greater than 50mm.
S4. mud makes：The mud being perfused when stirring production drilling.First plus water calculates volume, and swelling is added under stiring
Soda ash is added in soil as a solution under stiring, and mixing time is no less than three minutes, and the design parameter of mud is such as after stirring
Under：
Specific gravity：1.04~1.18；
Viscosity：18S~25S；
Funnel method solid concentration：6%~8%；
Colloidity：>95%；
Sand factor：<2%；
PH value：7~9.
The main function of mud is the hole wall of protection drilling during drilling, maintains the equilibrium of stress inside and outside drilling,
It prevents drilling from caving in, secondly can also play the role of taking slag, cooling drilling tool and lubrication.Parameter mud colloidity as above after stirring
Height, viscosity are big, so that the soil of borehole sidewall is adhered to, form smooth hole wall, and the intensity of hole wall is higher, resist
Landslide ability is stronger；In addition mud balance is suitable, will not because mud balance is excessively high cause drilling when soil easily adhere to brill
On tool, and the clod that can be avoided after cleaning suspends in turn result in and causes in concrete during pouring in mud
The case where being mingled with clod；Sand factor is low, is reduction of the abrasion of drilling bucket, and solid concentration is low, prove mud take the ability of slag compared with
By force.When being drilled in a word using above-mentioned mud, the flatness of drilling is high, is not easy to cave in, and it is strong to take slag ability, is not likely to produce clod
Adherency and suspension.
In step s 4, when making mud, fluid loss agent or blanc fixe are added during stirring.It digs sand in brill
It in the case where gravel layer or hard stratum, needs the specific gravity of mud larger, it is flat to be conducive to the pressure for maintaining drilling inside and outside in this way
Weighing apparatus can be added fluid loss agent or blanc fixe when making mud at this time during stirring, be capable of increasing specific gravity in this way,
And large effect will not be caused to other parameters.
In the case where boring digging stake holes in the stronger soil layer of water penetration, it can be added during stirring when making mud
Perhaps acrylic staple fibre can block the infiltration gap of stake holes to sawdust by sawdust or acrylic staple fibre in this way, reduce the rate of spillage.
S5. it drills：A certain amount of mud is injected into casing, is drilled downwards using rotary drilling rig, is lost later with mud
And hole depth increases, and supplements mud into drilling in time, specific step is as follows：
S51. drill bit lands, using the pressure of the self weight of drill bit or additional pressurization oil cylinder as the pressure of drilling, each time
Back into brill should be as far as possible reference with depth instrument, with specification drilling speed, to bore torque be guidance, and drilling depth amount is appropriate, few to bore,
It is many to bore, more then non-cutting times lengthenings are bored, few then, low efficiency small back into ruler is bored.
S52. after filling soil, sand in drilling bucket, drilling bucket is elevated；
S53. rotary rig draws off the soil in drilling bucket；
S54. drilling bucket valve is closed, drilling machine is bored back in hole, land drilling rod, continues to creep into；
S55. step S52~S54 is repeated, keeps mud liquid level in the process, with the loss of mud and the increase of hole depth,
Mud is supplemented into hole in time.
Mud is replenished in time during boring and digging stake holes, guarantees that mud is filled in former stake holes, to maintain inside and outside stake holes
Pressure, avoid stake holes from caving in；The former mud in stake holes is dug by the brill of drilling bucket simultaneously, and the soil in drilling is made to be mixed into mud
In, the mud newly injected can dilute former mud, and the brill digging after being allowed to is more easier.
When bore meet Soft Soil Layer when, longer bucket tooth and the big drilling bucket of space width should be selected, check bottom cutting tooth after mentioning brill, and
Shi Qingli between cog foundry loam replaces the bucket tooth of blunt.Because the adhesive capacity of Soft Soil Layer is stronger, but is easy to bore and dig, therefore use
Longer bucket tooth bores digging ability to be promoted, and is then not easy to be adhered to soil on drilling bucket using the lesser drilling bucket of space width, clear in time
Reason between cog foundry loam can then prevent the soil of adherency from packing phenomenon occur.
Hard stratum is met and when every round trip drilling depth is small, disintegrating slag amount is few in drilling bucket when boring, and can change a small diameter
Then drilling bucket, one aperture of subdrilling use the drilling bucket reaming of appropriate diameter again.It can reduce the difficulty bored and dug in this way, improve and bore digging
Efficiency, while reducing the damage to drilling bucket.
When boring chance sand gravel stratum, appropriate clay can be put into hole, drilled using fishing sand drilling bucket.To stake holes
After interior investment clay, clay particle adsorbs colloidality substance, wraps up the big hydration shell of thicker plasticity on surface, makes clay
Grain is accumulated under differential pressure action, the small thin mudcake of fine and close permeability is formed, to reduce fluid loss.
In addition, during boring stake holes, the promotion of drilling bucket or the speed of lower section be not easy it is too fast, otherwise in stake holes easily
Negative pressure is generated, hole wall collapse is caused, the promotion speed of drilling bucket is 0.5m/s~0.75m/s when generally filling dregs, is mentioned when unloaded
It rises or the speed of lower section is 0.83m/s.
S6. borehole cleaning：Cleaning hole bottom sediment.Because churning driven is not recycled with mud, in the case where ensureing that mud is stablized, remove
Bottom hole sediment, general fishing sand drilling bucket, in the case where not drilling depth, revolution drilling bucket enters sediment in bucket as much as possible, reversion,
Sluice gate is closed, that is, can reach the purpose of borehole cleaning.
S7. steel reinforcement cage and conduit are successively transferred：Conduit connection will seal straight, and mouth is from bottom hole 20cm~50cm under conduit；
S8. by tremie placing concrete, specific step is as follows：
S81. steel reinforcement cage, conduit decentralization finish, and make hidden inspection, carry out secondary pile hole cleaning when necessary, after acceptance(check), are poured immediately
Concrete；
S82. should have the label of design using ready-mixed concrete, good workability, the slump is preferably 180~220mm；
S83. beginning quantity, which should ensure that, is no less than 0.8m under the Transducers Embedded in Concrete face of conduit lower end；
S84. water proof plug should have good water isolating, and can be smoothly discharged；
S85. depth of tremie guarantees that 2~6m promotes conduit as concrete surface rises at any time；
S86. when concrete is filled to steel reinforcement cage lower end, to prevent rising of steel cage, following measure should be taken, in aperture fixed steel bars
Cage upper end；Infusion time shortens as far as possible, and mobility is deteriorated when preventing concrete from entering steel reinforcement cage；When hole inner concrete face enters steel
When muscle 1~2m of cage, conduit should be suitably promoted, reduces depth of tremie, increases buried depth of the steel reinforcement cage in lower-layer concrete；
S87. at the end of being perfused, stake top absolute altitude is controlled, concrete surface should be more than design 300~500mm of stake top absolute altitude, ensure pile crown
Quality.
The following are use different mud parameters and using the effect after mud in the work progress of rotary digging drilling hole bored concrete pile
Fruit.
Embodiment one：
Specific gravity：1.04；
Viscosity：18S；
Funnel method solid concentration：6%；
Colloidity：96%；
Sand factor：0.8%；
PH value：7~9.
Embodiment two：
Specific gravity：1.18；
Viscosity：25S；
Funnel method solid concentration：8%；
Colloidity：98%；
Sand factor：1.9%；
PH value：7~9.
Embodiment three：
Specific gravity：1.18；
Viscosity：25S；
Funnel method solid concentration：8%；
Colloidity：97%；
Sand factor：2.3%；
PH value：7~9.
Example IV：
Specific gravity：1.15；
Viscosity：25S；
Funnel method solid concentration：8%；
PH value：9；
Colloidity 98%；
Sand factor：2.2%.
The stake holes for boring same depth using the drilling rod of same size on the ground of identical soil property, is respectively adopted embodiment one
The mud of parameter into example IV obtains following experimental data.
Embodiment one：The hole wall of stake holes is smooth, and clod doping is small in the mud after drilling, no bulk clod, bit grinding
Damage amount is normal.
Embodiment two：The hole wall of stake holes is smooth, and clod doping is small in the mud after drilling, no bulk clod, bit grinding
Damage amount is normal.
Embodiment three：The hole wall of stake holes is smooth, and clod doping is small in the mud after drilling, no bulk clod, bit grinding
Damage degree is larger.
Example IV：The hole wall of stake holes is smooth, and clod doping is small in the mud after drilling, no bulk clod, bit grinding
Damage degree is larger.
Comparative example two and embodiment three it is found that when lower sand factor the abrasion of drill bit it is smaller.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (8)
1. a kind of construction method of rotary digging drilling hole bored concrete pile, includes the following steps：S1. drilling machine installation is in place；S2. it determines and right
Quasi- stake position：True fixed pile adjusts the mast of rotary drilling rig, so that mast is in plummet state, allows drilling bucket or augers to just
Stake position；S3. casing is buried：Using stake position center as the center of circle, according to the radius of casing, casing position is made on the ground, by casing
It is buried in the earth, the internal diameter of casing is greater than boring aperture, and the height of casing is above the ground level；S4. mud makes：Stirring production drilling
When the mud that is perfused；S5. it drills：A certain amount of mud is injected into casing, is drilled downwards using rotary drilling rig later, with mud
Slurry loss and hole depth increase, and supplement mud into drilling in time；S6. borehole cleaning：Cleaning hole bottom sediment；S7. reinforcing bar is successively transferred
Cage and conduit：Conduit connection will seal straight, and mouth is from bottom hole 20cm~50cm under conduit；S8. pass through tremie placing concrete；
It is characterized in that, the mud in step S4 is made of blender, first plus water calculates volume, and bentonite is added under stiring,
Soda ash is added under stirring as a solution, mixing time is no less than three minutes, and the design parameter of mud is as follows after stirring：Than
Weight：1.04~1.18 viscosity：18S~25S funnel method solid concentration：6%~8% colloidity：>95% sand factor：<2% PH
Value：7~9.
2. a kind of construction method of rotary digging drilling hole bored concrete pile according to claim 1, which is characterized in that in step s 4,
When making mud, fluid loss agent or blanc fixe are added during stirring.
3. a kind of construction method of rotary digging drilling hole bored concrete pile according to claim 1, which is characterized in that in step s 4,
When making mud, sawdust or acrylic staple fibre are added during stirring.
4. a kind of construction method of rotary digging drilling hole bored concrete pile according to claim 1, which is characterized in that step S5's is specific
Step is：S51. drill bit lands, the pressure using the pressure of the self weight of drill bit or additional pressurization oil cylinder as drilling, rotation
Turn drill bit, creeps into；S52. after filling soil, sand in drilling bucket, drilling bucket is elevated；S53. rotary rig, will be in drilling bucket
Soil is drawn off；S54. drilling bucket valve is closed, drilling machine is bored back in hole, land drilling rod, continues to creep into；S55. repeat step S52~
S54 keeps mud liquid level to supplement mud into hole in time with the loss of mud and the increase of hole depth in the process.
5. a kind of construction method of rotary digging drilling hole bored concrete pile according to claim 4, which is characterized in that in step s 4,
It bores when meeting Soft Soil Layer, selects longer bucket tooth and the big drilling bucket of space width, check bottom cutting tooth after mentioning brill, it is viscous to clear up between cog in time
Mud replaces the bucket tooth of blunt.
6. a kind of construction method of rotary digging drilling hole bored concrete pile according to claim 4, which is characterized in that in step s 4,
It bores and meets hard stratum and when every round trip drilling depth is small, disintegrating slag amount is few in drilling bucket, change the drilling bucket of a small diameter, subdrilling one is small
Then the drilling bucket reaming of appropriate diameter is used in hole again.
7. a kind of construction method of rotary digging drilling hole bored concrete pile according to claim 4, which is characterized in that bore and meet sand boulder and cobble
When layer, appropriate clay is put into hole, is drilled using fishing sand drilling bucket.
8. a kind of construction method of rotary digging drilling hole bored concrete pile according to claim 4, which is characterized in that in step S5, bore
The speed of promotion or the decentralization of bucket is as follows：It is 0.5m/s~0.75m/s, 0.83m/s when unloaded when filling dregs.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424444A (en) * | 2019-08-13 | 2019-11-08 | 中国电建集团山东电力建设有限公司 | Steel pipe pole overhead transmission line foundation pile construction method |
| CN110965549A (en) * | 2019-12-17 | 2020-04-07 | 广东省水利水电第三工程局有限公司 | Cast-in-situ bored pile construction method |
| CN111535305A (en) * | 2020-05-07 | 2020-08-14 | 中铁隧道局集团有限公司 | Construction method of cast-in-situ bored pile for air well |
| CN113738272A (en) * | 2021-11-08 | 2021-12-03 | 中建八局发展建设有限公司 | Rotary drilling hole forming construction method for pile foundation in gravel area with easy hole collapse |
| CN114059527A (en) * | 2021-12-09 | 2022-02-18 | 深圳市基础工程有限公司 | Large-diameter mixing pile construction method suitable for high-groundwater-level hard soil layer |
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| CN110965549A (en) * | 2019-12-17 | 2020-04-07 | 广东省水利水电第三工程局有限公司 | Cast-in-situ bored pile construction method |
| CN110965549B (en) * | 2019-12-17 | 2020-11-24 | 广东省水利水电第三工程局有限公司 | Cast-in-situ bored pile construction method |
| CN111535305A (en) * | 2020-05-07 | 2020-08-14 | 中铁隧道局集团有限公司 | Construction method of cast-in-situ bored pile for air well |
| CN113738272A (en) * | 2021-11-08 | 2021-12-03 | 中建八局发展建设有限公司 | Rotary drilling hole forming construction method for pile foundation in gravel area with easy hole collapse |
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