CN110374097A - The construction method for improving bearing capacity of pile foundation is stirred based on major diameter - Google Patents
The construction method for improving bearing capacity of pile foundation is stirred based on major diameter Download PDFInfo
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- CN110374097A CN110374097A CN201910681495.1A CN201910681495A CN110374097A CN 110374097 A CN110374097 A CN 110374097A CN 201910681495 A CN201910681495 A CN 201910681495A CN 110374097 A CN110374097 A CN 110374097A
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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
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0051—Including fibers
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The construction method for improving bearing capacity of pile foundation is stirred based on major diameter, belong to piling Technology field, based on the stirring drill bit for being provided with stirring jet port and high-pressure rotary-spray mouth at stirring blade back and agitation driller is combined, carry out the construction method of major diameter deep-layer stirring using following steps: mixing plant configures and transformation；Stir whitewashing liquid and whirl spraying slurry configurations；Stirring is lower to bore construction；Stirring proposes brill construction；Stirring operation is completed, implements to plant stake operation；Construction terminates.The present invention is expanded mixing pile diameter, and be inserted into tubular pole and reached higher intensity by the way that multiple stirring spouts and high-pressure rotary-spray spout is arranged；By mixing basalt fibre in slurries, the cohesive strength of slurries is increased, the intensity of major diameter mixing pile is improved；Different construction parameters is used to different geological conditions, achievees the purpose that adaptation to local conditions.
Description
Technical field
The invention belongs to piling Technology fields, and in particular to improve applying for bearing capacity of pile foundation to stirring based on major diameter
Work method.
Background technique
Cement-soil mixing pile is a kind of method for reinforcing soft ground, it is led to using cement as curing agent
Special Mixing Machine and pump for mortar transmission are crossed, mixes weak soil and curing agent action of forced stirring in ground depths, utilizes curing agent and soft
Generated a series of physical chemical reaction between soil makes weak soil scleroma at globality, water stability and higher base is held
Carry the composite foundation of power.Stiff composite pile is to be inserted core stake before cement mixing method initial set, forms common stress
A kind of new compound pile-type.
Currently, Deep Mixing Piles Construction process still has some problems, first is that mixing pile diameter is smaller, if diameter mistake
Greatly, bearing capacity of single pile is difficult to control；Second is that construction efficiency is affected by human factors, degree is big, and the mechanically actuated of worker is horizontal and whole
Body quality influence construction efficiency, construction error caused by subjective factor are difficult to control；Third is that construction efficiency is low, in dense sand stratum
Deep mixer rate of penetration is slow, if encountering harder soil layer, mixing pile construction may not be able to continue, and seriously affects
Construction speed；Fourth is that construction cost is high, equipment damage is serious, to the mill of drill bit when deep-mixing pile driver is crept into dense sand stratum
Damage is than more serious.Therefore, to solve the above-mentioned problems, the invention proposes stir to improve applying for bearing capacity of pile foundation based on major diameter
Work method.
Summary of the invention
For the above-mentioned technical problems in the prior art, the invention proposes improve pile foundation based on major diameter stirring to hold
The construction method for carrying power, overcomes the deficiencies in the prior art.By the way that multiple stirring spouts and high-pressure rotary-spray spout is arranged, will stir
Stake diameter is expanded, and is inserted into tubular pole and has been reached higher intensity；By mixing basalt fibre in slurries, slurry is increased
The cohesive strength of liquid improves the intensity of major diameter mixing pile；Different construction parameters is used to different geological conditions, is reached because of ground
The purpose of suiting measures to different conditions.
To achieve the goals above, the present invention adopts the following technical scheme:
The construction method for improving bearing capacity of pile foundation is stirred based on major diameter, which is characterized in that based in the setting of stirring blade back
The stirring drill bit of stirring jet port and high-pressure rotary-spray mouth simultaneously combines agitation driller, carries out major diameter deep layer using following steps and stirs
The construction method mixed:
Step 1: mixing plant configuration and transformation；Stirring drill bit is stirred blade and stirs blade again and formed by stirring drilling rod, master, is stirred in master
1-10 stirring jet port and 1 high-pressure rotary-spray mouth is respectively set in blade back, independently stirs leaf according to the quantity of stirring jet port
It is evenly arranged among piece to two sides, high-pressure rotary-spray mouth is set to the main outer edge for stirring blade；By configured stirring drill bit and company
Stacks is connected through a screw thread, and stirring drill bit and jointed rod entirety are then passed through flanged joint with agitation driller；
Step 2: stirring whitewashing liquid and whirl spraying slurry configurations；It stirs whitewashing liquid and whirl spraying slurries is all made of cement mixed with basalt fibre
Slurries；Wherein, select length be 5-50mm, the basalt fibre that diameter is 1-50 μm, basalt fibre is in cement grout
Quality accounting range is 0%-1.2%；The ratio of mud of cement grout is 1-2；
Test index mark is passed through according to the mark of the construction site soil body pass through the dynamic adjustment of radix N value stir whitewashing liquid and whirl spraying slurry configurations side
Case, concrete configuration scheme are as follows:
Mark pass through test index mark pass through radix N value range be 0-30 when, selection length be 5-10mm, the basalt that diameter is 1-10 μm
Fiber, quality accounting range of the basalt fibre in cement grout are 0%-0.3%；
Mark pass through test index mark pass through radix N value range be 30-50 when, selection length be 10-20mm, the Black Warrior that diameter is 1-20 μm
Rock fiber, quality accounting range of the basalt fibre in cement grout are 0%-0.6%；
Mark passes through test index mark and passes through radix N value range when being 50-80, and selection length is 20-30mm, diameter is 20-30 μm profound
Military rock fiber, quality accounting range of the basalt fibre in cement grout are 0%-0.9%；
When mark passes through test index mark and passes through radix N value greater than 80, select the basalt that length is 30-50mm, diameter is 30-50 μm fine
Dimension, quality accounting range of the basalt fibre in cement grout are 0%-1.2%；
Step 3: stirring is lower to bore construction；It is sprayed by stirring jet port continuity mixed with basalt fibre in stirring going down process
Cement grout, injection pressure is 0.5-10MPa, and the amount of injection of slurries is lower to bore, mention and bore total the amount of injection in going down process
10%-30%；
Step 4: stirring proposes brill construction；It is sprayed by stirring jet port continuity mixed with basalt fibre in stirring drilling process
Cement grout, injection pressure be 0.5-10MPa；By the injection of whirl spraying jet port discontinuity mixed with the cement of basalt fibre
Slurries, injection pressure are 10-60MPa；The amount of injection of slurries is lower brill, mentions the 70%-90% for boring total the amount of injection in drilling process；
Step 5: completing stirring operation, implement to plant stake operation；Stirring operation is completed when stirring drill bit is promoted to design height, it is quiet
It sets 0-48 hours, then tubular pole is inserted by design requirement the designated position of stirring pile body, tubular pole is fixed, stand 2-48
Hour, release the constraint to tubular pole；
Step 6: construction terminates.
Preferably, test index mark is passed through according to the mark of the construction site soil body and passes through radix N value dynamic adjustment rotary-spraying construction scheme,
Concrete configuration scheme is as follows:
Mark pass through test index mark pass through radix N value range be 0-30 when, vertical direction at interval of 0.5-1.0m pass through whirl spraying jet port
Carry out a whirl spraying operation, each rotary-spraying construction hoisting depth is 0.1-0.3m；
Mark pass through test index mark pass through radix N value range be 30-50 when, vertical direction at interval of 1.0-2.0m pass through whirl spraying jet port
Carry out a whirl spraying operation, each rotary-spraying construction hoisting depth is 0.1-0.3m；
Mark pass through test index mark pass through radix N value range be 50-80 when, vertical direction at interval of 2.0-3.0m pass through whirl spraying jet port
Carry out a whirl spraying operation, each rotary-spraying construction hoisting depth is 0.1-0.3m；
When mark passes through test index mark and passes through radix N value greater than 80, vertical direction is carried out at interval of 3.0-5.0m by whirl spraying jet port
Whirl spraying operation, each rotary-spraying construction hoisting depth are 0.1-0.3m；
Preferably, it is 100-1000mm/min, revolving speed 10-20r/ that drilling rod, which moves down speed, in the stirring going down process
min；It is 500-2000mm/min, revolving speed 10-20r/min that drilling rod, which moves up speed, in stirring lifting process.
Preferably, the injection in lower brill, drilling process is to stir mixed with the gross mass of the cement grout of basalt fibre
Mix the 10-30% of soil body gross mass.
Preferably, the stirring jet port, high-pressure rotary-spray mouth are all made of high-strength alloy material and are made, and yield strength is greater than
345MPa；Stirring jet port diameter is 10-50mm, and high-pressure rotary-spray mouth diameter is 1-5mm.
Advantageous effects brought by the present invention:
(1) by the way that multiple stirring spouts and high-pressure rotary-spray spout is arranged, mixing pile diameter is expanded, and be inserted into tubular pole and reach
Higher intensity；(2) by mixing basalt fibre in slurries, the cohesive strength of slurries is increased, major diameter is improved and stirs
Mix the intensity of stake；(3) different construction parameters is used to different geological conditions, achievees the purpose that adaptation to local conditions.
Detailed description of the invention
Fig. 1 is that the process flow chart for improving the construction method of bearing capacity of pile foundation is stirred the present invention is based on major diameter.
Specific embodiment
With reference to the accompanying drawing and specific embodiment invention is further described in detail:
Embodiment 1:
Using construction method of the invention, when it is 20 that the mark of Geological condition, which passes through test index mark to pass through radix N value, according to such as
Lower step carries out:
The construction method for improving bearing capacity of pile foundation is stirred based on major diameter, which is characterized in that based in the setting of stirring blade back
The stirring drill bit of stirring jet port and high-pressure rotary-spray mouth simultaneously combines agitation driller, carries out major diameter deep layer using following steps and stirs
The construction method mixed:
Step 1: mixing plant configuration and transformation；Stirring drill bit is stirred blade and stirs blade again and formed by stirring drilling rod, master, is stirred in master
5 stirring jet ports and 1 high-pressure rotary-spray mouth is respectively set in blade back, is independently stirred in blade according to the quantity of stirring jet port
Between be evenly arranged to two sides, high-pressure rotary-spray mouth is set to the main outer edge for stirring blade；By configured stirring drill bit with connect bore
Bar is connected through a screw thread, and stirring drill bit and jointed rod entirety are then passed through flanged joint with agitation driller；
Step 2: stirring whitewashing liquid and whirl spraying slurry configurations；It stirs whitewashing liquid and whirl spraying slurries is all made of cement mixed with basalt fibre
Slurries；Wherein, to select length be 10mm, the basalt fibre that diameter is 7 μm, and quality of the basalt fibre in cement grout account for
It is 0.2% than range；The ratio of mud of cement grout is 1.2；
Step 3: stirring is lower to bore construction；It is sprayed by stirring jet port continuity mixed with basalt fibre in stirring going down process
Cement grout, injection pressure is 10MPa, and the amount of injection of slurries is lower to bore, mention and bore the 20% of total the amount of injection in going down process；
Step 4: stirring proposes brill construction；It is sprayed by stirring jet port continuity mixed with basalt fibre in stirring drilling process
Cement grout, injection pressure be 10MPa；By the injection of whirl spraying jet port discontinuity mixed with the cement slurry of basalt fibre
Liquid, injection pressure are 30MPa；The amount of injection of slurries is lower 80% for boring, proposing the total the amount of injection of brill in drilling process；
Step 5: completing stirring operation, implement to plant stake operation；Stirring operation is completed when stirring drill bit is promoted to design height, it is quiet
It sets 1.5 hours, then tubular pole is inserted by design requirement the designated position of stirring pile body, tubular pole is fixed, it is small to stand 3
When, release the constraint to tubular pole；
Step 6: construction terminates.
Preferably, test index mark is passed through according to the mark of the construction site soil body and passes through radix N value dynamic adjustment rotary-spraying construction scheme,
Concrete configuration scheme is as follows:
Vertical direction carries out a whirl spraying operation by whirl spraying jet port at interval of 0.7m, and each rotary-spraying construction hoisting depth is
0.2m；
Preferably, it is 500mm/min, revolving speed 15r/min that drilling rod, which moves down speed, in the stirring going down process；Stirring mentions
It is 1000mm/min, revolving speed 15r/min that drilling rod, which moves up speed, during rising.
Preferably, the injection in lower brill, drilling process is to stir mixed with the gross mass of the cement grout of basalt fibre
Mix the 15% of soil body gross mass.
Preferably, the stirring jet port, high-pressure rotary-spray mouth are all made of high-strength alloy material and are made, and yield strength is
400MPa；Stirring jet port diameter is 20mm, and high-pressure rotary-spray mouth diameter is 3mm.
Embodiment 2:
Using construction method of the invention, when it is 40 that the mark of Geological condition, which passes through test index mark to pass through radix N value, according to such as
Lower step carries out:
The construction method for improving bearing capacity of pile foundation is stirred based on major diameter, which is characterized in that based in the setting of stirring blade back
The stirring drill bit of stirring jet port and high-pressure rotary-spray mouth simultaneously combines agitation driller, carries out major diameter deep layer using following steps and stirs
The construction method mixed:
Step 1: mixing plant configuration and transformation；Stirring drill bit is stirred blade and stirs blade again and formed by stirring drilling rod, master, is stirred in master
5 stirring jet ports and 1 high-pressure rotary-spray mouth is respectively set in blade back, is independently stirred in blade according to the quantity of stirring jet port
Between be evenly arranged to two sides, high-pressure rotary-spray mouth is set to the main outer edge for stirring blade；By configured stirring drill bit with connect bore
Bar is connected through a screw thread, and stirring drill bit and jointed rod entirety are then passed through flanged joint with agitation driller；
Step 2: stirring whitewashing liquid and whirl spraying slurry configurations；It stirs whitewashing liquid and whirl spraying slurries is all made of cement mixed with basalt fibre
Slurries；Wherein, select length be 15mm, the basalt fibre that diameter is 15 μm, quality of the basalt fibre in cement grout
Accounting range is 0.5%；The ratio of mud of cement grout is 1.2；
Step 3: stirring is lower to bore construction；It is sprayed by stirring jet port continuity mixed with basalt fibre in stirring going down process
Cement grout, injection pressure is 10MPa, and the amount of injection of slurries is lower to bore, mention and bore the 20% of total the amount of injection in going down process；
Step 4: stirring proposes brill construction；It is sprayed by stirring jet port continuity mixed with basalt fibre in stirring drilling process
Cement grout, injection pressure be 10MPa；By the injection of whirl spraying jet port discontinuity mixed with the cement slurry of basalt fibre
Liquid, injection pressure are 40MPa；The amount of injection of slurries is lower 80% for boring, proposing the total the amount of injection of brill in drilling process；
Step 5: completing stirring operation, implement to plant stake operation；Stirring operation is completed when stirring drill bit is promoted to design height, it is quiet
It sets 1.5 hours, then tubular pole is inserted by design requirement the designated position of stirring pile body, tubular pole is fixed, it is small to stand 3
When, release the constraint to tubular pole；
Step 6: construction terminates.
Preferably, test index mark is passed through according to the mark of the construction site soil body and passes through radix N value dynamic adjustment rotary-spraying construction scheme,
Concrete configuration scheme is as follows:
Vertical direction carries out a whirl spraying operation by whirl spraying jet port at interval of 1.5m, and each rotary-spraying construction hoisting depth is
0.2m。
Preferably, it is 700mm/min, revolving speed 15r/min that drilling rod, which moves down speed, in the stirring going down process；It stirs
Mixing drilling rod in lifting process and moving up speed is 1500mm/min, revolving speed 15r/min.
Preferably, the injection in lower brill, drilling process is to stir mixed with the gross mass of the cement grout of basalt fibre
Mix the 15% of soil body gross mass.
Preferably, the stirring jet port, high-pressure rotary-spray mouth are all made of high-strength alloy material and are made, and yield strength is
400MPa；Stirring jet port diameter is 25mm, and high-pressure rotary-spray mouth diameter is 2mm.
The construction method for improving bearing capacity of pile foundation is stirred the present invention is based on major diameter, by the way that multiple stirring spouts and height is arranged
Pressure rotary-spraying spout expands mixing pile diameter, and is inserted into tubular pole and has reached higher intensity；It is profound by being mixed in slurries
Military rock fiber, increases the cohesive strength of slurries, improves the intensity of major diameter mixing pile；To different geological conditions using different
Construction parameter achievees the purpose that adaptation to local conditions.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also belong to guarantor of the invention
Protect range.
Claims (5)
1. stirring the construction method for improving bearing capacity of pile foundation based on major diameter, which is characterized in that based on being set at stirring blade back
It has set the stirring drill bit of stirring jet port and high-pressure rotary-spray mouth and has combined agitation driller, carried out major diameter deep layer using following steps
The construction method of stirring:
Step 1: mixing plant configuration and transformation；Stirring drill bit is stirred blade and stirs blade again and formed by stirring drilling rod, master, is stirred in master
1-10 stirring jet port and 1 high-pressure rotary-spray mouth is respectively set in blade back, independently stirs leaf according to the quantity of stirring jet port
It is evenly arranged among piece to two sides, high-pressure rotary-spray mouth is set to the main outer edge for stirring blade；By configured stirring drill bit and company
Stacks is connected through a screw thread, and stirring drill bit and jointed rod entirety are then passed through flanged joint with agitation driller；
Step 2: stirring whitewashing liquid and whirl spraying slurry configurations；It stirs whitewashing liquid and whirl spraying slurries is all made of cement mixed with basalt fibre
Slurries；Wherein, select length be 5-50mm, the basalt fibre that diameter is 1-50 μm, basalt fibre is in cement grout
Quality accounting range is 0%-1.2%；The ratio of mud of cement grout is 1-2；
Test index mark is passed through according to the mark of the construction site soil body pass through the dynamic adjustment of radix N value stir whitewashing liquid and whirl spraying slurry configurations side
Case, concrete configuration scheme are as follows:
Mark pass through test index mark pass through radix N value range be 0-30 when, selection length be 5-10mm, the basalt that diameter is 1-10 μm
Fiber, quality accounting range of the basalt fibre in cement grout are 0%-0.3%；
Mark pass through test index mark pass through radix N value range be 30-50 when, selection length be 10-20mm, the Black Warrior that diameter is 1-20 μm
Rock fiber, quality accounting range of the basalt fibre in cement grout are 0%-0.6%；
Mark passes through test index mark and passes through radix N value range when being 50-80, and selection length is 20-30mm, diameter is 20-30 μm profound
Military rock fiber, quality accounting range of the basalt fibre in cement grout are 0%-0.9%；
When mark passes through test index mark and passes through radix N value greater than 80, select the basalt that length is 30-50mm, diameter is 30-50 μm fine
Dimension, quality accounting range of the basalt fibre in cement grout are 0%-1.2%；
Step 3: stirring is lower to bore construction；It is sprayed by stirring jet port continuity mixed with basalt fibre in stirring going down process
Cement grout, injection pressure is 0.5-10MPa, and the amount of injection of slurries is lower to bore, mention and bore total the amount of injection in going down process
10%-30%；
Step 4: stirring proposes brill construction；It is sprayed by stirring jet port continuity mixed with basalt fibre in stirring drilling process
Cement grout, injection pressure be 0.5-10MPa；By the injection of whirl spraying jet port discontinuity mixed with the cement of basalt fibre
Slurries, injection pressure are 10-60MPa；The amount of injection of slurries is lower brill, mentions the 70%-90% for boring total the amount of injection in drilling process；
Step 5: completing stirring operation, implement to plant stake operation；Stirring operation is completed when stirring drill bit is promoted to design height, it is quiet
It sets 0-48 hours, then tubular pole is inserted by design requirement the designated position of stirring pile body, tubular pole is fixed, stand 2-48
Hour, release the constraint to tubular pole；
Step 6: construction terminates.
2. according to claim 1 stir the construction method for improving bearing capacity of pile foundation based on major diameter, which is characterized in that root
Test index mark is passed through according to the mark of the construction site soil body and passes through radix N value dynamic adjustment rotary-spraying construction scheme, and concrete configuration scheme is as follows:
Mark pass through test index mark pass through radix N value range be 0-30 when, vertical direction at interval of 0.5-1.0m pass through whirl spraying jet port
Carry out a whirl spraying operation, each rotary-spraying construction hoisting depth is 0.1-0.3m；
Mark pass through test index mark pass through radix N value range be 30-50 when, vertical direction at interval of 1.0-2.0m pass through whirl spraying jet port
Carry out a whirl spraying operation, each rotary-spraying construction hoisting depth is 0.1-0.3m；
Mark pass through test index mark pass through radix N value range be 50-80 when, vertical direction at interval of 2.0-3.0m pass through whirl spraying jet port
Carry out a whirl spraying operation, each rotary-spraying construction hoisting depth is 0.1-0.3m；
When mark passes through test index mark and passes through radix N value greater than 80, vertical direction is carried out at interval of 3.0-5.0m by whirl spraying jet port
Whirl spraying operation, each rotary-spraying construction hoisting depth are 0.1-0.3m.
3. according to claim 1 stir the construction method for improving bearing capacity of pile foundation based on major diameter, which is characterized in that institute
Stating drilling rod in stirring going down process and moving down speed is 100-1000mm/min, revolving speed 10-20r/min；Stirring was promoted
It is 500-2000mm/min, revolving speed 10-20r/min that drilling rod, which moves up speed, in journey.
4. according to claim 1 stir the construction method for improving bearing capacity of pile foundation based on major diameter, which is characterized in that institute
State it is lower bore, the 10- that injection mixed with the gross mass of the cement grout of basalt fibre be stirring soil body gross mass in drilling process
30%。
5. according to claim 1 stir the construction method for improving bearing capacity of pile foundation based on major diameter, which is characterized in that institute
It states stirring jet port, high-pressure rotary-spray mouth to be all made of high-strength alloy material and be made, yield strength is greater than 345MPa；It is straight to stir jet port
Diameter is 10-50mm, and high-pressure rotary-spray mouth diameter is 1-5mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910681495.1A CN110374097A (en) | 2019-07-26 | 2019-07-26 | The construction method for improving bearing capacity of pile foundation is stirred based on major diameter |
| PCT/CN2020/101639 WO2021017799A1 (en) | 2019-07-26 | 2020-07-13 | Construction method for improving bearing capacity of pile foundation on basis of large-diameter mixing |
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| CN201910681495.1A CN110374097A (en) | 2019-07-26 | 2019-07-26 | The construction method for improving bearing capacity of pile foundation is stirred based on major diameter |
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| WO2021017799A1 (en) * | 2019-07-26 | 2021-02-04 | 北京中岩大地科技股份有限公司 | Construction method for improving bearing capacity of pile foundation on basis of large-diameter mixing |
| CN112796311A (en) * | 2020-08-24 | 2021-05-14 | 北京中岩大地科技股份有限公司 | Construction method for high-speed deep stirring |
| CN113882440A (en) * | 2021-09-29 | 2022-01-04 | 北京中岩大地科技股份有限公司 | Method for predicting construction efficiency of composite pile under consideration of multi-factor influence |
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