CN114482009A - Method for treating hole bunching phenomenon in construction of karst stratum cast-in-situ bored pile - Google Patents
Method for treating hole bunching phenomenon in construction of karst stratum cast-in-situ bored pile Download PDFInfo
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- CN114482009A CN114482009A CN202210101640.6A CN202210101640A CN114482009A CN 114482009 A CN114482009 A CN 114482009A CN 202210101640 A CN202210101640 A CN 202210101640A CN 114482009 A CN114482009 A CN 114482009A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000010276 construction Methods 0.000 title claims abstract description 21
- 238000011065 in-situ storage Methods 0.000 title claims description 10
- 238000005553 drilling Methods 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 9
- 239000000945 filler Substances 0.000 claims abstract description 7
- 229920005646 polycarboxylate Polymers 0.000 claims description 12
- 239000003638 chemical reducing agent Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 4
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 4
- PUZPDOWCWNUUKD-UHFFFAOYSA-M sodium fluoride Chemical compound [F-].[Na+] PUZPDOWCWNUUKD-UHFFFAOYSA-M 0.000 claims description 4
- 238000009933 burial Methods 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000010412 perfusion Effects 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 claims description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
- 239000001110 calcium chloride Substances 0.000 claims description 2
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 2
- 238000013461 design Methods 0.000 claims description 2
- 239000010440 gypsum Substances 0.000 claims description 2
- 229910052602 gypsum Inorganic materials 0.000 claims description 2
- 239000010446 mirabilite Substances 0.000 claims description 2
- 235000019353 potassium silicate Nutrition 0.000 claims description 2
- 238000003672 processing method Methods 0.000 claims description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 claims description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 2
- 239000011780 sodium chloride Substances 0.000 claims description 2
- 239000011775 sodium fluoride Substances 0.000 claims description 2
- 235000013024 sodium fluoride Nutrition 0.000 claims description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 2
- 239000008030 superplasticizer Substances 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 235000019994 cava Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000000192 social effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- 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
-
- 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
-
- 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
- E02D2300/002—Concrete
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- General Engineering & Computer Science (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Geochemistry & Mineralogy (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to the technical field of construction of a karst stratum bored pile, in particular to a method for processing a hole string phenomenon in the construction of the karst stratum bored pile. Firstly, carrying out advanced geological survey on a region to be processed, and then carrying out hole stringing treatment according to the depth of a hole to be surveyed: the method comprises the following steps of (1) enabling a guide pipe to be placed at the bottom of a karst cave, and adopting low-grade early-strength concrete materials to carry out underwater filling, backfilling and plugging to the position 1-2m above the karst cave through the guide pipe; and standing for a certain time, observing the hole forming condition of the karst cave stratum, if the hole forming of the karst cave stratum is unsuccessful, carrying out hole stringing again, and if the hole forming of the karst cave stratum is successful, continuously drilling to the designed elevation of the pile bottom. The method of the invention adopts early strength concrete, and reduces the initial setting time of the concrete. The initial setting time is reduced, so that the flow channel of the karst filler is blocked, and the consumption of concrete is properly reduced; the treatment cost is low, the hole stringing phenomenon can be effectively treated, and the amount of concrete used for treatment can be controlled within a reasonable range, so that the phenomenon of no bottom hole is avoided.
Description
Technical Field
The invention relates to the technical field of construction of a karst stratum bored pile, in particular to a method for processing a hole string phenomenon in the construction of the karst stratum bored pile.
Background
In karst areas, the phenomenon that karst caves are communicated among a plurality of piles is very likely to occur in the construction process of the cast-in-situ bored piles, which is called as hole stringing. The cast-in-situ bored pile runs into the karst cave stratum and clears away the sediment in-process, if take place the string hole phenomenon, the karst cave filler is difficult to the clean up, and long-time clear hole makes the peripheral karst cave cavity of drilling bigger and bigger, causes to pour in-process concrete and flows into the karst cave, not only can lead to the pore-forming efficiency to reduce, still can produce the phenomenon that actual concrete dosage is far greater than theoretical dosage. Therefore, when the phenomenon of hole string is found in the construction process, a proper method is needed for processing, so that the waste of concrete can be effectively prevented while the hole forming efficiency is improved.
Disclosure of Invention
The invention aims to provide a method for treating the phenomenon of hole bunching in construction of a cast-in-situ bored pile in a karst stratum, which aims to solve the problems of high cost, low treatment efficiency and the like in the traditional method in karst treatment.
The above purpose of the invention is realized by the following technical scheme:
a method for processing a hole string phenomenon in construction of a karst stratum cast-in-situ bored pile comprises the following steps:
s1, advance geological prospecting:
before pile foundation construction, performing geological survey on a to-be-processed area by using a pilot drill, and checking the burial depth, the height and the filling state of a karst cave at the periphery of a pile foundation;
s2, pile hole drilling:
drilling a stratum above the karst cave and a pile hole of the karst cave stratum by adopting a rotary drilling rig, slowing down the drilling speed after entering the karst cave stratum, judging that a hole string phenomenon exists if adjacent drill holes are subjected to scumming in the drilling slag removing process, and stopping cleaning holes if no hole string phenomenon exists, and performing the following step S3 to prevent the hole string phenomenon from being aggravated due to the fact that a communicated part is emptied; when no hole is formed, the pile is backfilled by using rubbles and then continuously drilled to the elevation of the pile bottom;
s3, string hole processing:
stirring the karst cave filler to a suspension state by adopting a drill rod of a rotary drilling rig, descending a guide pipe to the bottom of the karst cave according to the hole depth obtained by advanced geological exploration, wherein the buried depth of the guide pipe is 2-3m, and then adopting a low-grade early-strength concrete material as the karst cave filler to carry out underwater perfusion, backfill and plugging to the position 1-2m above the karst cave through the guide pipe;
s4, standing for pore forming:
standing the backfilled low-grade early-strength concrete material until the concrete strength meets the design requirement, observing the hole forming condition of the karst cave stratum, if the hole forming of the karst cave stratum is unsuccessful, performing hole stringing again according to the step S3, and if the hole forming of the karst cave stratum is successful, continuing drilling to reach the designed elevation of the pile bottom;
the low-grade early-strength concrete material is formed by mixing low-grade concrete (preferably concrete C15) and an early-strength polycarboxylate water reducer, wherein the early-strength polycarboxylate water reducer contains 2-5 wt% of an early strength agent (preferably 3 wt% of the early strength agent), the mass of the early-strength polycarboxylate water reducer is 3-5% of that of cement in the low-grade concrete, and the slump of the low-grade early-strength concrete material is 150-160 mm; the particle size of the coarse aggregate in the low-grade concrete is 15-30 mm.
Further, the early strength agent contained in the early strength type polycarboxylate water reducing agent comprises one or more of calcium chloride, sodium chloride, mirabilite, gypsum, water glass, sodium aluminate, sodium carbonate, calcium carbonate, sodium fluoride and triethanolamine; more preferably triethanolamine.
Further, in the above processing method, during the underwater pouring of the low-grade early-strength concrete material, the pouring speed is slowed down and the concrete supply time is increased according to actual conditions, specifically: stopping for 5-20min after the low-grade early-strength concrete material of 0.5 square is poured, and controlling the time interval between the concrete pouring of two adjacent vehicles to be 0.5-1 h so as to prevent the poured concrete from being dispersed by the later poured concrete.
Further, in the engineering practice, in the step S4, after the low-grade early-strength concrete material is backfilled, the concrete material generally needs to be left standing for 48 hours, at this time, the concrete strength generally reaches 40% -50%, and if the standing time is too short, the original processing part is easily disturbed during subsequent drilling and hole forming; the standing time is too long, the difficulty of subsequent drilling is increased, the mechanical shift is increased for the subsequent drilling, and the cost is increased.
Compared with the prior art, the technical scheme of the invention adopts low-grade early-strength concrete material, so that the initial setting time of concrete can be effectively reduced; the initial setting time is reduced, so that the flow channel of the karst filler can be blocked, and the consumption of concrete is properly reduced; the treatment cost is low, the hole stringing phenomenon can be effectively treated, and the amount of concrete used for treatment can be controlled within a reasonable range, so that the phenomenon of no bottom hole is avoided.
Drawings
FIG. 1 is a schematic flow chart of the method for treating the hole string phenomenon in the construction of the cast-in-situ bored pile in the karst stratum.
FIG. 2 is a schematic diagram of the site construction of the string hole treatment in the embodiment.
Detailed Description
The technical solution of the present invention is further described with reference to the following specific embodiments.
The embodiment provides a method for treating a hole string phenomenon in construction of a karst stratum cast-in-situ bored pile, which comprises the following steps of:
s1, advance geological prospecting:
before the construction of the pile foundation, advance drilling is used for carrying out geological investigation, and the burial depth, the height and the filling state of a karst cave at the periphery of the pile foundation are checked;
s2, pile hole drilling:
drilling a stratum above the karst cave and a pile hole of the karst cave stratum by adopting a rotary drilling rig, slowing down the drilling speed after entering the karst cave stratum, judging that a hole string phenomenon exists if adjacent drill holes are subjected to scumming in the drilling slag removing process, and stopping cleaning holes if no hole string phenomenon exists, and performing step S3 to prevent the hole string phenomenon from being aggravated due to the fact that a communicated part is emptied; when no hole is formed, the pile is backfilled by using rubbles and then continuously drilled to the elevation of the pile bottom;
s3, string hole processing:
stirring the karst cave filler to a suspension state by adopting a drill rod of a rotary drilling rig, lowering a guide pipe to the bottom of the karst cave according to the hole depth surveyed in advance geology, wherein the buried depth of the guide pipe is 2-3m, and then carrying out underwater perfusion, backfill and plugging by adopting low-grade early-strength concrete materials through the guide pipe until the position is 1-2m above the karst cave (the actual backfill height is adjusted in the range according to the back-falling allowance and plugging effect of the plugging concrete in a construction site);
s4, standing for pore forming:
after the backfilled low-grade early-strength concrete is kept stand for 48 hours, observing the hole forming condition of the karst cave stratum, if the hole forming of the karst cave stratum is unsuccessful, performing hole stringing again according to the step S3, and if the hole forming of the karst cave stratum is successful, continuing pile hole drilling until the designed elevation of the pile bottom is reached;
the low-grade early-strength concrete material is formed by mixing low-grade concrete and an early-strength polycarboxylate superplasticizer (an early-strength polycarboxylate high-performance water reducer CR-P300), wherein the early-strength polycarboxylate superplasticizer contains 3 wt% of triethanolamine as an early-strength agent, the mass of the early-strength polycarboxylate superplasticizer is 4% of the mass of cement in the low-grade concrete, and the slump of the low-grade early-strength concrete material is controlled to be 150-160 mm; the particle size of the coarse aggregate in the low-grade concrete is 15-30 mm.
In the treatment method, the control key points when the low-grade early-strength concrete material is poured are as follows:
(1) according to the field situation, the concrete supply time is increased: the underwater concrete pouring speed is properly reduced (the underwater concrete pouring speed is stopped for 5-20min after each pouring time is 0.5 square, the underwater concrete pouring speed is stopped for about 10min when the poured concrete material does not obviously sink in the next pouring process), the pouring time interval of the concrete of two adjacent vehicles (the volume of each vehicle is 6 square) is 0.5-1 h, the poured concrete is prevented from being scattered by the poured concrete, and the guide pipe is rotated or lifted frequently during the waiting period, so that the guide pipe is prevented from being solidified or blocked;
(2) controlling the buried depth of the conduit: when the fluidity of concrete is reduced and the pouring speed is reduced, the buried depth of the guide pipe needs to be controlled well, the pipe blockage phenomenon is avoided, and the buried depth is controlled to be 3m when the concrete is applied to the following construction site.
The method is applied to a shed area reconstruction project with the total building area of 120279.82m29 buildings in total, project pile foundation engineering comprises 1060 engineering piles, 18 engineering test piles, 61 support piles and 16 tower crane piles, which are all 800mm cast-in-situ bored piles. The construction start date of the pile foundation is 7 months and 12 days in 2021, and the completion date is 11 months and 1 day in 2021.
The karst unfavorable geological phenomenon is found locally in the stroke fossil limestone in the fourth layer of the site underlying bedrock, the project adopts a pile foundation with the stroke fossil limestone in the fourth layer as a foundation bearing layer, and the pile end is arranged on the complete bedrock with the length of more than or equal to 5 meters. In the project, the method is adopted for carrying out the string hole treatment, the hole forming efficiency is improved, meanwhile, the concrete waste is effectively prevented, the construction cost is reduced, the cost is saved by about 213.45 ten thousand yuan, and good social effect and economic benefit are obtained.
Claims (5)
1. A method for processing a hole string phenomenon in construction of a karst stratum cast-in-situ bored pile comprises the following steps:
s1, advance geological prospecting:
before pile foundation construction, performing geological survey on a to-be-processed area by using a pilot drill, and checking the burial depth, the height and the filling state of a karst cave at the periphery of a pile foundation;
s2, pile hole drilling:
drilling a stratum above the karst cave and a pile hole of the karst cave stratum by adopting a rotary drilling rig, slowing down the drilling speed after entering the karst cave stratum, judging that a hole string phenomenon exists when adjacent drill holes are found to have scumming in the drilling slag removing process, otherwise, stopping cleaning the holes when no hole string phenomenon exists, and performing the following step S3 to prevent the hole string phenomenon from being aggravated because a communicated part is emptied; when no hole is formed, the pile is backfilled by using rubbles and then continuously drilled to the elevation of the pile bottom;
s3, string hole processing:
stirring the karst cave filler to a suspension state by adopting a drill rod of a rotary drilling rig, descending a guide pipe to the bottom of the karst cave according to the hole depth obtained by advanced geological exploration, wherein the buried depth of the guide pipe is 2-3m, and then performing underwater perfusion, backfill and plugging by adopting low-grade early-strength concrete material through the guide pipe until the position is 1-2m above the karst cave;
s4, standing for pore forming:
after the backfilled low-grade early-strength concrete material is kept stand until the concrete strength reaches the design requirement, observing the hole forming condition of the karst cave stratum, if the hole forming of the karst cave stratum is unsuccessful, carrying out hole stringing again according to the step S3, and if the hole forming of the karst cave stratum is successful, continuing drilling to reach the designed elevation of the pile bottom;
the low-grade early-strength concrete material is formed by mixing low-grade concrete and an early-strength polycarboxylate water reducer, wherein the early-strength polycarboxylate water reducer contains 2-5 wt% of an early strength agent, the mass of the early-strength polycarboxylate water reducer is 3-5% of the mass of cement in the low-grade concrete, and the slump of the low-grade early-strength concrete material is 150-160 mm; the particle size of the coarse aggregate in the low-grade concrete is 15-30 mm.
2. The treatment method according to claim 1, wherein the early strength agent contained in the early strength type polycarboxylate water reducer comprises one or more of calcium chloride, sodium chloride, mirabilite, gypsum, water glass, sodium aluminate, sodium carbonate, calcium carbonate, sodium fluoride and triethanolamine.
3. The process of claim 1 wherein the low grade concrete is C15 concrete.
4. The processing method according to claim 1, wherein in the step S3, the low-grade early-strength concrete material is stopped for 5-20min after the low-grade early-strength concrete material is poured for 0.5 square in the underwater pouring process, and the pouring time interval between two adjacent concrete cars is controlled to be 0.5-1 h.
5. The process of claim 1, wherein in step S4, after the low-grade early-strength concrete material is backfilled, the concrete is left for 48 hours, and the strength of the concrete reaches 40 to 50 percent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210101640.6A CN114482009A (en) | 2022-01-27 | 2022-01-27 | Method for treating hole bunching phenomenon in construction of karst stratum cast-in-situ bored pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210101640.6A CN114482009A (en) | 2022-01-27 | 2022-01-27 | Method for treating hole bunching phenomenon in construction of karst stratum cast-in-situ bored pile |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102040347A (en) * | 2009-10-20 | 2011-05-04 | 深圳市海川实业股份有限公司 | Polycarboxylic admixture for weak concrete |
| CN103046537A (en) * | 2012-12-21 | 2013-04-17 | 长江勘测规划设计研究有限责任公司 | Method for plugging exploratory holes above karst caves |
| JP2017082513A (en) * | 2015-10-29 | 2017-05-18 | 大亜ソイル株式会社 | Cast-in-place concrete pile and construction method thereof |
| CN111042116A (en) * | 2019-12-31 | 2020-04-21 | 福建建中建设科技有限责任公司 | Karst cave stratum pile foundation construction method |
-
2022
- 2022-01-27 CN CN202210101640.6A patent/CN114482009A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102040347A (en) * | 2009-10-20 | 2011-05-04 | 深圳市海川实业股份有限公司 | Polycarboxylic admixture for weak concrete |
| CN103046537A (en) * | 2012-12-21 | 2013-04-17 | 长江勘测规划设计研究有限责任公司 | Method for plugging exploratory holes above karst caves |
| JP2017082513A (en) * | 2015-10-29 | 2017-05-18 | 大亜ソイル株式会社 | Cast-in-place concrete pile and construction method thereof |
| CN111042116A (en) * | 2019-12-31 | 2020-04-21 | 福建建中建设科技有限责任公司 | Karst cave stratum pile foundation construction method |
Non-Patent Citations (2)
| Title |
|---|
| 冯雅妮: "复杂岩溶地区桩基施工技术", 《国防交通工程与技术》 * |
| 吴昊: "岩溶地区桩基工程应用分析", 《广州建筑》 * |
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Application publication date: 20220513 |