CN106638547A - Pile-forming method for cast-in-place pile in coral sand foundation - Google Patents
Pile-forming method for cast-in-place pile in coral sand foundation Download PDFInfo
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- CN106638547A CN106638547A CN201610903940.0A CN201610903940A CN106638547A CN 106638547 A CN106638547 A CN 106638547A CN 201610903940 A CN201610903940 A CN 201610903940A CN 106638547 A CN106638547 A CN 106638547A
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- pile
- grouting pipe
- cast
- stake holes
- stake
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Classifications
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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
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
-
- 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
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Artificial Fish Reefs (AREA)
Abstract
The invention discloses a pile-forming method for a cast-in-place pile in a coral sand foundation. The method is characterized by comprising: reinforcing a piling position of a cast-in-place pile and the coral around by preliminary grouting, such that a column body isolated from the peripheral foundation and underwater is formed, then piling in the column body. The construction method is characterized in that after the grouting of certain depth is finished, a grouting pipe is lifted, and then the grouting process is repeated, such that reinforced areas of different depths are equal. According to the size of the area to be reinforced, single, three or a plurality of grouting pipes can be uniformly arranged symmetrically. The pile-forming method is easy to realize, simple and convenient to operate, low in cost, and capable of effectively reducing a side friction resistance caused by stressing and breaking of the coral sand and attenuation of a pile end bearing force, and is a good method for forming the cast-in-place pile on coral reef.
Description
Technical field
The present invention relates to a kind of pile base construction method, more particularly to a kind of pile making method in coral reef sandy ground base.
Background technology
Coral reef is the Rock And Soil that the remains after the death of project cost consulting item colony are formed through very long geologic process, mainly
Composition is calcium carbonate.China's Modern Coral Reefs are mainly distributed on the South China Sea Islands and northern littoral, the islands and reefs at the South Sea substantially by
Coral reef is constituted.Coral reef is almost China in the unique land territory type in the South Sea, China at present the South Sea it is all of it is military,
Fish-farming operation facility none all build on coral reef unexceptionally.
Pile foundation refers to the deep foundation being made up of the pile framing (abbreviation cushion cap) of stake and connection stake top or is connected with pile foundation by post
Single-pile foundation.The classification of eucalyptus construction method mainly includes prefabricated pile and present walling pile.Prefabricated pile is made of in factory or job site
Various materials, various forms of stakes (such as timber, concrete square pile, prestressed concrete pipe pile, piling bar), use sinking apparatus
Stake is squeezed into, be pressed into or shaken in burying.Present walling pile is called bored concrete pile, the directly pore-forming on the ground of design stake position is referred to, in hole
Interior placement or does not put reinforcing bar at steel reinforcement cage, after in hole concrete perfusion and pile.
Bored concrete pile has high capacity, settling amount little and more uniform and the characteristics of good antiseptic property, can apply to various
Engineering geological condition and various types of engineerings.Grout pile length, pilespacing can be adjusted flexibly, and cost is low compared with piling bar, prefabricated pile.So
And, substantial amounts of test and case history are proved：Coral reef sand has the characteristics such as broken, many spaces, high compression, after structure destruction
It is difficult to recover, adds the impact of Seawater, cause pile side friction and end resistance to reduce even disappearing, bearing capacity may loses
Lose.It is in nineteen sixty-eight, in Iranian Lavan oil platforms process of construction that people produce attention to the engineering properties of calcareous sand first
In, the stake of diameter about 1m behind the good stratum of the degree of consolidation through about 8m, free-falling about 15m.In calcareous sand ground
Pile, due to calcareous sand very little stress it is little Particle Breakage, therefore whether driven pile or bored concrete pile will occur, due to
Disturbance to calcareous sand foundation soil, stake week calcareous sand Particle Breakage, stress relaxation, pile side friction and end resistance be all after pile
Can weaken, reduce bearing capacity of pile foundation.Therefore, the pile foundation based on conventional foundation material is inapplicable in coral reef sand.
Bored concrete pile of constructing on coral island also has a difficult problem, be exactly on islands and reefs level of ground water it is higher, and coral reef sand
Permeability is big, and underground water penetrates into quickly stake holes when drilling in coral sand, not only makes stake holes cave in, and has an effect on pouring for concrete
Quality.The underground water in coral island area is seawater, unfavorable to pile quality with corrosivity.
The content of the invention
It is an object of the invention to the technology that coral reef sand is crushed for solving to be caused due to drilling on coral reef sand place is asked
Topic, and because coral reef sand crushes the technical problem and underground water that cause the side friction and end resistance of bored concrete pile to reduce
A kind of problem, there is provided pile making method of the cast-in-situ bored pile in coral reef sand.
The technical scheme adopted to realize the object of the invention is such, the construction of advanced bored concrete pile on a kind of coral reef
Method, comprises the following steps：
1) drilling in advance：The stake position of cast-in-situ bored pile is preset on coral reef；One or more are crept on default stake position
Advance borehole；A diameter of 10～20cm of the advance borehole；The depth of the advance borehole exceedes 1～2m of designing pile length；
2) Grouting Pipe is transferred：Grouting Pipe is put into the advance borehole, the default note of tube wall of Grouting Pipe lower end Grouting Pipe
Slurry hole, Grouting Pipe distance from bottom 10～30cm of foot of hole.
3) mortar depositing construction：Slip casting pipe, the pumped slurry into Grouting Pipe are installed；Marginal not slurry pulls out Grouting Pipe on side, until note
Slurry pipe takes out completely；The slurries of injection are selected from ordinary cement slurries, expansive cement mortar or high polymer material；Slurry infiltration is to super
In malm around front drilling, after grout cures, slurries stabilization zone is formed；
4) pore-forming drilling：
Drill in described slurries stabilization zone, i.e., form stake holes in the center of described default stake position；Stake holes depth
Reach the designing pile length of cast-in-situ bored pile；Because slurries have formed Jiang Gu areas, Qie Jianggu areas scope is more than stake holes scope, therefore bores
Retaining wall measure need not be adopted during stake holes, Groundwater infiltration is there will not be in stake holes；
5) steel reinforcement cage is placed and catheter installation：Precast reinforced cage is put into in stake holes, 1～2 coagulation is placed in stake holes
Native conduit；
6) filling concrete：By the tremie to concrete perfusion in stake holes, cast-in-situ bored pile is formed.
Advantages of the present invention and effect are：Coral reef sandy ground base adopts pretreatment, by high polymer or expansive mortar elder generation
A range of stabilization zone is formed, then in stabilization zone bored pile again, it is therefore prevented that because calcareous sand Particle attrition causes pile foundation
The loss of collateral resistance and end resistance, pile body bearing capacity is high.
Injection high polymer or expansive mortar, the stabilization zone of formation completely cuts off completely with surrounding seawater, can be in slurries stabilization zone
Safe construction stake holes, underground sea water is not penetrated into, and pile quality is good.
The principle of the invention is easily understood, easy to operate, with low cost, can effectively improve pile side friction and stake bottom carries
Power, is a kind of practical method of the economical and efficient of cast-in-situ bored pile on coral reef.
Description of the drawings
Fig. 1 advance drilling filling pile construction schematic diagrames
Fig. 2 Grouting Pipe position views
In figure：1-slurries pumping equipment；2-level of ground water；3-Grouting Pipe；4-injected hole；5-Jiang Gu areas；6-steel
Muscle cage；7-bored concrete pile.
Specific embodiment
With reference to embodiment, the invention will be further described, but should not be construed above-mentioned subject area of the invention only
It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used
With means, various replacements and change are made, all should be included within the scope of the present invention.
The present embodiment discloses a kind of construction method of advanced bored concrete pile on coral reef, comprises the following steps：
1) drilling in advance：The stake position of cast-in-situ bored pile is preset on coral reef；Referring to a parts of Fig. 1, in default stake position
It is upper to creep into one or more advance boreholes；If only 1 advance borehole, the hole position is in default Zhuan Wei centers (referring to the g portions of Fig. 2
Point).When required Jiang Gu areas cross-sectional area is larger, it is contemplated that many Grouting Pipe grouting and reinforcings, that is, multiple advance boreholes are needed, this
Some holes surrounds default Zhuan Wei centers (referring to h the and i parts of Fig. 2).
A diameter of 10～20cm of the advance borehole；The depth of the advance borehole exceedes designing pile length (drill-pouring
The stake of stake is long) 1～2m；
Preferably, during drilling, opening diameter is set to 110mm, is drilled into design hole depth.
2) Grouting Pipe is transferred：Grouting Pipe is put into the advance borehole, slip casting tube wall in Grouting Pipe lower end presets slip casting
Hole, injected hole is staggered in quincunx, Grouting Pipe distance from bottom 10～30cm of foot of hole.
3) mortar depositing construction：Slip casting pipe, the pumped slurry into Grouting Pipe are installed；Marginal not slurry pulls out Grouting Pipe on side, until note
Slurry pipe takes out completely；
In embodiment, such as shown in Fig. 1 (a), Grouting Pipe insertion drilling in advance, grouting equipment (1) is pumped by injected hole (4)
Slurries
Until under 0.1～2MPa grouting pressures, flow rate of grouting≤0.4L/min continues to irrigate one hour；
Or during≤1L/min, continue to irrigate 90min；
Such as Fig. 1 (b), grouting pipe is lifted into certain distance, again repeatedly previous step, until Grouting Pipe is carried completely
Go out.Slip casting should immediately clean slurries transfer pipeline after finishing, and prevent remaining slurry plugs.
The slurries of injection are selected from ordinary cement slurries, expansive cement mortar or high polymer material；Slurry infiltration is to advance drilling
In malm around hole, after grout cures, slurries stabilization zone is formed, shown in such as Fig. 1 (c)；
4) pore-forming drilling：
Drill in described slurries stabilization zone, i.e., form stake holes in the center of described default stake position；Such as Fig. 1 (d)
Shown, stake holes depth reaches the designing pile length of cast-in-situ bored pile；Because slurries have formed Jiang Gu areas, Qie Jianggu areas scope is more than stake
Hole scope, therefore retaining wall measure of need not adopt during stake holes is bored, Groundwater infiltration is there will not be in stake holes；In embodiment,
Can be crept into using Drilling by inverse circulation, be not required to steel cylinder retaining wall.Top can select three wings cage type bit, and bottom can adopt rotary drill
Head.Hole quality is guaranteed using layering drilling technology, it is light during perforate to press slow-speed to keep the guidance quality and stability of drilling tool, by not
Appropriate slurries are pumped with stratum.It is drilled into drilling tool lift-off bottom hole 0.2m or so, up and down, low speed revolution, full pump after hole depth
Amount punching, is fully ground bottom hole larger particles, treats to can be considered once to empty without larger particles in discharge slurries finishing, the time in the hole in
>=20min, is measured till hole depth meets design requirement with plummet.
5) steel reinforcement cage is placed and catheter installation：As shown in Fig. 1 (e), precast reinforced cage is put into in stake holes, is put in stake holes
Put 1～2 tremie；
6) filling concrete：By the tremie to concrete perfusion in stake holes, cast-in-situ bored pile is formed.As schemed
Shown in 1 (f), construct concrete configuration requirement 5～20mm of coarse aggregate size, and sand factor >=38%, 18～22cm of slump, workability is good
It is good.Once imbed concrete face in conduit bottom>12m, opening will continuously construct after filling, ensure in filling process depth of tremie control 2～
In the range of 6m, final concrete perfusion face is higher than on design stake top absolute altitude 1m.
Claims (1)
1. in a kind of coral sand ground bored concrete pile pile making method, it is characterised in that comprise the following steps：
1) drilling in advance：The stake position of cast-in-situ bored pile is preset on coral reef；One or more are crept on default stake position
Advance borehole.A diameter of 10～20cm of the advance borehole；The depth of the advance borehole exceedes 1～2m of designing pile length；
2) Grouting Pipe is transferred：Grouting Pipe is put into the advance borehole, the default injected hole of tube wall of Grouting Pipe lower end Grouting Pipe,
Grouting Pipe distance from bottom 10～30cm of foot of hole.
3) mortar depositing construction：Slip casting pipe, the pumped slurry into Grouting Pipe are installed；Marginal not slurry pulls out Grouting Pipe on side, until Grouting Pipe
Take out completely；The slurries of injection are selected from ordinary cement slurries, expansive cement mortar or high polymer material；Slurry infiltration is to advance drilling
In malm around hole, after grout cures, slurries stabilization zone is formed；
4) pore-forming drilling：
Drill in described slurries stabilization zone, i.e., form stake holes in the center of described default stake position；Stake holes depth reaches
The designing pile length of cast-in-situ bored pile；Because slurries have formed Jiang Gu areas, Qie Jianggu areas scope is more than stake holes scope, therefore bores stake holes
During need not adopt retaining wall measure, Groundwater infiltration is there will not be in stake holes；
5) steel reinforcement cage is placed and catheter installation：Precast reinforced cage is put into in stake holes, 1～2 concrete is placed in stake holes and is led
Pipe；
6) filling concrete：By the tremie to concrete perfusion in stake holes, cast-in-situ bored pile is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610903940.0A CN106638547B (en) | 2016-10-17 | 2016-10-17 | The pile making method of bored concrete pile in a kind of coral sand ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610903940.0A CN106638547B (en) | 2016-10-17 | 2016-10-17 | The pile making method of bored concrete pile in a kind of coral sand ground |
Publications (2)
| Publication Number | Publication Date |
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| CN106638547A true CN106638547A (en) | 2017-05-10 |
| CN106638547B CN106638547B (en) | 2019-11-01 |
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| CN201610903940.0A Active CN106638547B (en) | 2016-10-17 | 2016-10-17 | The pile making method of bored concrete pile in a kind of coral sand ground |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109811760A (en) * | 2019-01-31 | 2019-05-28 | 山东科技大学 | A kind of method that high polymer PFA reinforces South Sea coral sand ground |
| CN110143782A (en) * | 2019-05-23 | 2019-08-20 | 湖北工业大学 | A kind of South Sea calcareous sand high polymer compacted soil and preparation method |
| CN110565639A (en) * | 2019-09-11 | 2019-12-13 | 中船第九设计研究院工程有限公司 | Bored concrete pile hole forming and side wall grouting construction method for coral sand foundation |
| CN111535307A (en) * | 2020-05-22 | 2020-08-14 | 河北建设勘察研究院有限公司 | Hole forming construction method for rotary drilling cast-in-place pile in reef limestone stratum |
| CN113090184A (en) * | 2021-04-13 | 2021-07-09 | 三峡大学 | Suction drill bit device for suction pore-forming in coral sand and construction method |
| CN113529721A (en) * | 2021-07-15 | 2021-10-22 | 中国海洋大学 | Combined drilling and grouting pipe for grouting reinforcement of island reef weak stratum and construction method |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109811760A (en) * | 2019-01-31 | 2019-05-28 | 山东科技大学 | A kind of method that high polymer PFA reinforces South Sea coral sand ground |
| CN110143782A (en) * | 2019-05-23 | 2019-08-20 | 湖北工业大学 | A kind of South Sea calcareous sand high polymer compacted soil and preparation method |
| CN110565639A (en) * | 2019-09-11 | 2019-12-13 | 中船第九设计研究院工程有限公司 | Bored concrete pile hole forming and side wall grouting construction method for coral sand foundation |
| CN110565639B (en) * | 2019-09-11 | 2021-03-23 | 中船第九设计研究院工程有限公司 | Bored concrete pile hole forming and side wall grouting construction method for coral sand foundation |
| CN111535307A (en) * | 2020-05-22 | 2020-08-14 | 河北建设勘察研究院有限公司 | Hole forming construction method for rotary drilling cast-in-place pile in reef limestone stratum |
| CN113090184A (en) * | 2021-04-13 | 2021-07-09 | 三峡大学 | Suction drill bit device for suction pore-forming in coral sand and construction method |
| CN113529721A (en) * | 2021-07-15 | 2021-10-22 | 中国海洋大学 | Combined drilling and grouting pipe for grouting reinforcement of island reef weak stratum and construction method |
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| Publication number | Publication date |
|---|---|
| CN106638547B (en) | 2019-11-01 |
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