CN108086342A - The construction method of karst strata pile foundation - Google Patents
The construction method of karst strata pile foundation Download PDFInfo
- Publication number
- CN108086342A CN108086342A CN201711407377.9A CN201711407377A CN108086342A CN 108086342 A CN108086342 A CN 108086342A CN 201711407377 A CN201711407377 A CN 201711407377A CN 108086342 A CN108086342 A CN 108086342A
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- concrete
- solution cavity
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- conduit
- pile foundation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
-
- 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
- E02D5/38—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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- Engineering & Computer Science (AREA)
- General 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)
- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to a kind of construction methods of karst strata pile foundation, place hole to be drilled on karst strata drills downward vertically, and judge whether solution cavity in drilling, if in the presence of, continue to judge the height of the solution cavity, if the height of the solution cavity is less than setting height, the solution cavity is filled using concrete；If the height of the solution cavity is more than setting height, the method to be followed up using steel pile casting；The steel reinforcement cage made in advance is hung in place along the drilling；Sinking conduit makes the conduit be continuously injected into concrete formation pile foundation into the steel reinforcement cage out of described conduit close to the foot of hole.The present invention can be to avoid the collapse hole phenomenon occurred in work progress, and construction is simple is at low cost.
Description
Technical field
The present invention relates to the technical fields of pile foundation construction, refer in particular to a kind of construction method of karst strata pile foundation.
Background technology
At present, karst strata is distributed in southern region of China than wide, and the upper strata of usual karst strata is silty clay,
Base is weak weathering ash rock stratum, more with erodible arch cave, commonly referred to as solution cavity.And solution cavity is by surface water and groundwater
To the underground corrosion phenomenon that dissolubility rock stratum is formed by chemical action and mechanical damage effect, which can influence its week
Stability and the mechanics distribution of skirt rock.
During pile foundation construction, it is underground concealed engineering to be excavated due to pile foundation, can not avoid meeting solution cavity sometimes, by
Easily there is collapse hole phenomenon in the complexity of Karst Cave Formation and the Unpredictability of underground karst cavity form size, work progress,
Cause the dangerous and destabilizing factor of engineering structure to increase, construction technology is made to become complicated, directly affects entire engineering
Uncertain and risk.
In order to overcome the above problem, existing Chinese invention patent（CN102146672A）It discloses a kind of in karst area
Pile base construction method, by taken immediately after the solution cavity that is run into during pile foundation construction the emergency measure that steel pile casting follows up to prevent
Then only collapse hole uses throwing slabstone, clay and solution cavity is blocked the method for extruding and consolidation process, finally completes reinforcing bar again
Cast-in-place concrete pile moulding process.Although the above method advantageously ensures that the safety of construction, but due to solution cavity in karst strata
Size have difference, if to all solution cavities of discovery using the method for steel pile casting follow-up in drilling process, due to the use of
Steel pile casting it is of high cost, and steel pile casting needs to process, and when use also needs to cooperation steel pipe support, therefore it is difficult to add construction
Degree, causes to extend construction period.
The content of the invention
For this purpose, the technical problems to be solved by the invention are to overcome in the prior art in pile foundation construction process construction period
It is long, it is of high cost the problem of so as to the construction method of karst strata pile foundation for providing a kind of construction is simple and reducing cost.
In order to solve the above technical problems, a kind of construction method of karst strata pile foundation of the present invention, includes the following steps：Step
Rapid S1：Place hole to be drilled on karst strata drills downward vertically, and judges whether solution cavity in drilling, if in the presence of,
S2 is entered step, otherwise enters step S3；Step S2：The height of the solution cavity is judged, if the height of the solution cavity is less than setting
Highly, first the solution cavity is filled using concrete, until concrete is higher by the stake footpath height of the Upper Plate of Karst Cave, and it is mixed
When solidifying soil face no longer declines, stop being perfused, continue drilling and forming hole after concrete reaches setting intensity to design stake bottom；It is if described
The height of solution cavity is more than setting height, the method to be followed up using steel pile casting；Step S3：By the steel reinforcement cage made in advance along the brill
Hole is hung in place；Step S4:Sinking conduit makes the conduit close to the foot of hole, to the reinforcing bar out of described conduit
Concrete is continuously injected into cage and forms pile foundation.
In one embodiment of the invention, when drilling in the step S1, piles with different position drilling on same pier is adopted
It is drilled with diagonal, every the method for hole construction.
In one embodiment of the invention, it is described when hole is constructed, construct next pile base when, upper pile base it is strong
Degree starts to construct after reaching setting intensity.
In one embodiment of the invention, to during the construction of piles with different length, first construction stake length is long on same pier, solution cavity is more
And the stake holes that construction is difficult.
In one embodiment of the invention, in the step S2, the method for steel pile casting follow-up is：It drills through described molten
When at the top of hole, the steel pile casting made is sink to bottom hole along the drilling, Underwater Concrete conduit is put into the drilling, utilizes concrete
It is blocked, after concrete solidifies and generates some strength, then bore, follow up steel pile casting, when the steel pile casting is advanced with proceeding to
After exploring the following setpoint distance in solution cavity bottom, drilling to design stake bottom.
In one embodiment of the invention, it is described when drilling through at the top of the solution cavity, it is repeatedly lifted up boring hammer, at top
Slow play gently carries thickness range up and down, bores hammer unobvious and is obstructed, and illustrates top pore-forming and round and smooth vertical, is tied up with steel wire rope knot that can be undone by a pull
Firmly steel pile casting is put into along the drilling and sinks down into bottom hole.
In one embodiment of the invention, it is described drill through the solution cavity after, assembled good Underwater Concrete conduit is put
Enter in hole, blocked using concrete, while concrete need to carry out after initial set is reached after front concrete, the slump of concrete is controlled in certain model
In enclosing, after concrete solidifies and generates some strength, then carried out with churning driven repeating back to brills, follow-up steel pile casting.
In one embodiment of the invention, before the step S3, it is laggard to treat that the drilling reaches the designed elevation
Row borehole cleaning.
In one embodiment of the invention, in the step S4, before sinking conduit, dense water examination is made to the conduit
It tests.
In one embodiment of the invention, when being continuously injected into concrete, the length of embedment of the conduit is controlled, promotes institute
When stating conduit, depth of tremie is determined according to solution cavity situation.
The above technical solution of the present invention has the following advantages over the prior art：
The construction method of karst strata pile foundation of the present invention passes through the height of the solution cavity found during construction then using difference
Processing means, for being less than the solution cavity of setting height, handled by way of filling, not only avoid the accident of collapse hole, and
And construction is simple, advantageously reduce cost；For being more than the solution cavity of setting height, using the method for steel pile casting follow-up, due to pin
To different solution cavity height using different processing methods, therefore have using cost is reduced, shorten construction period.
Description of the drawings
In order to make the content of the present invention more clearly understood, below according to specific embodiments of the present invention and combine
Attached drawing, the present invention is described in further detail, wherein
Fig. 1 is the construction method flow chart of karst strata pile foundation of the present invention.
Specific embodiment
As shown in Figure 1, the present embodiment provides a kind of construction methods of karst strata pile foundation, include the following steps：Step S1：
Place hole to be drilled on karst strata drills downward vertically, and judges whether solution cavity in drilling, if in the presence of into step
Rapid S2, otherwise enters step S3；Step S2：The height of the solution cavity is judged, if the height of the solution cavity is less than setting height, first
The solution cavity is filled using concrete, until concrete is higher by the stake footpath height of the Upper Plate of Karst Cave, and concrete surface
When no longer declining, stop being perfused, continue drilling and forming hole after concrete reaches setting intensity to design stake bottom；If the solution cavity
Highly it is more than setting height, the method to follow up using steel pile casting；Step S3：The steel reinforcement cage made in advance is hung along the drilling
In place；Step S4：Sinking conduit makes the conduit connect close to the foot of hole out of described conduit into the steel reinforcement cage
Continuous injection concrete forms pile foundation.
The construction method of karst strata pile foundation described in the present embodiment, it is hole to be drilled on karst strata in the step S1
Place drills downward vertically, and judges whether solution cavity in drilling, if in the presence of, S2 is entered step, otherwise enters step S3,
So as to advantageously ensure that the normal of construction；In the step S2, the height of the solution cavity is judged, if the height of the solution cavity is less than
Setting height first fills the solution cavity using concrete, until concrete is higher by the stake footpath height of the Upper Plate of Karst Cave,
And concrete surface stops perfusion when no longer declining, and continues drilling and forming hole after concrete reaches setting intensity to designing stake bottom, by
In just having handled solution cavity by way of filling, the accident of collapse hole, and construction is simple are not only avoided, is advantageously reduced into
This；If the height of the solution cavity is more than setting height, the method to be followed up using steel pile casting is highly adopted due to being directed to different solution cavities
With different processing methods, therefore have using cost is reduced, shorten construction period；In the step S3, by what is made in advance
Steel reinforcement cage is hung in place along the drilling；In the step S4, sinking conduit makes the conduit be pressed close to the foot of hole
It is poured according to underwater concrete irrigation method, being continuously injected into concrete into the steel reinforcement cage out of described conduit forms pile foundation, from
And the intensity and quality of the pile foundation is effectively ensured.
In the step S1, first make drilling machine in place before drilling, by drill bit align piles position, it is smooth steady to adjust the drilling machine
Gu ensure kelly perpendicular to the ground.During drilling, using diagonal drilling, construct to piles with different position drilling on same pier every hole
Method.It is described when hole is constructed, construct next pile base when, the intensity of upper pile base starts to apply after reaching setting intensity
Work, to cause pouring concrete pile failure by shear when preventing drilling.Specifically, for the pile foundation of same pier position, one is treated
After the completion of pile base concrete pours, and during concrete strength arrival 70%, it can just carry out next Construction of Pile Bedding Boring.In addition,
It should be according to design drawing and geologic report, to during the construction of piles with different length, first construction stake length is long on same pier, solution cavity is more in construction
And the stake holes that construction is difficult, it is generally more difficult when having first pile hole construction of stake of solution cavity in drilled pile, it is ensured that last layer is molten
Hole, which has been handled well, could continue lower brill, improve the success rate of pile foundation concrete pouring, and overcome bearing capacity of pile tip deficiency or pile foundation
The quality accidents such as unstability.
In the step S2, the method for steel pile casting follow-up is：When drilling through at the top of the solution cavity, the steel made is protected
Cylinder is sink to bottom hole along the drilling, and Underwater Concrete conduit is put into the drilling, is blocked using concrete, treats that concrete solidification generates one
After determining intensity, then bore, follow up steel pile casting, when the steel pile casting is with proceeding to the following setpoint distance in advance exploration solution cavity bottom
Afterwards, drilling extremely design stake bottom.Specifically, steel pile casting is processed in advance, and the processing dimension of steel pile casting must be strictly controlled, casing
The connecting sewing saved up and down also welds in seam crossing in addition to welding and strengthens steel band, casing horizontal joint formed plane vertically hangs down with casing
Directly, the verticality of entire steel pile casting is made to meet the requirements, vibration hammer and casing top surface firm welding, non-loosening；When transferring steel pile casting,
Position must be accurate, after the completion of decentralization, checks its elevation, vertical, casing top surface levelness.It is had become when drilling through at the top of solution cavity
During work(, to be repeatedly lifted up boring hammer, above and below top thickness scope slow play gently carry, bore hammer unobvious and be obstructed, illustrate top pore-forming
And it is round and smooth vertical, steel pile casting is pinioned with wire line hitch at this time, uses loop wheel machine（Or pile foundation own wt）Casing be put into and under
Bottom hole is sink to, is sunk if necessary with vibration hammer.When being constructed with rotary digging drilled as holes steel pile casting follow-up step, rotation should be made full use of in construction
The reaming performance bored is dug, steel pile casting is enable smoothly to sink.To ensure that steel pile casting smoothly glides, stake holes is needed vertically, without crooked, contracting
Neck.Churning driven, which is drilled into fluid bowl top extent, to be accomplished gently to propose slow play up and down, and formation one is small at slow drilling depth to the suede slot splits
Mouthful.Into after solution cavity, since the mud in hole certainly will be missed all, need individually to handle fluid bowl：After hole entoplasm has been missed,
Lift brill hammer as early as possible, assembled good Underwater Concrete conduit is put into hole, is blocked using concrete, wherein concrete need to be carried out repeatedly, and
The concrete poured into every time should not be excessive, while concrete need to carry out after initial set is reached after front concrete, and the slump of concrete is controlled in certain model
In enclosing, achieve the purpose that temporarily to block by the lazy flow of concrete, be carried out after concrete solidifies and generates some strength, then with churning driven
Brill is repeated back to, follow up steel pile casting；After the steel pile casting is with proceeding to the following setpoint distance in advance exploration solution cavity bottom, drilling is to designing
Stake bottom.
Meet design requirement to ensure into hole perpendicularity, in work progress, vertically controlled by the three-dimensional of drilling machine in itself
System repeatedly checks the verticality of pore-forming, it is ensured that hole quality, and hole tester is acted on to stake holes hole before transferring reinforcing bar before pore-forming
Footpath, gradient are checked, to ensure pile body into hole perpendicularity.In addition, it is carried out after the drilling reaches the designed elevation
Borehole cleaning, the purpose of borehole cleaning are to remove boring mud and the beds of precipitation, reduce bottom hole precipitation thickness to the greatest extent, prevent a bottom retain blocked up sediment and
The bearing capacity of stake is reduced, dry hole borehole cleaning carries out fishing sand using pick Double bottom fishing sand hopper.
In the step S4, before sinking conduit, dense water experiment is made to the conduit, by check conduit connection whether
Securely and secret room, influence to be perfused to prevent gas leakage spillage, and when reducing or undergauge occurs in conduit and groove occurs in tube wall, must not
It uses.The conduit is 30-50cm apart from bottom hole height.In addition, when being continuously injected into concrete, the embedment for controlling the conduit is deep
Degree, when promoting the conduit, depth of tremie is determined according to solution cavity situation.Specifically, during casting concrete, continuously in an orderly manner into
Row shortens the time for removing conduit, must not pause halfway as far as possible, and the time that pours per pile should not be too long；When in funnel or
When concrete is discontented in conduit, slowly pours, prevent from causing pressure-air capsule in conduit, pressure leakage conduit.During filling concrete
The length of embedment of conduit need to be controlled, forbids conduit bottom end proposing concrete surface.It, be according to solution cavity when conduit is promoted in perfusion
Situation determines depth of tremie, avoids racking solution cavity concrete surface in filling process and declines suddenly, fracture accident is caused, mixed
Should suitably depth of tremie be increased at solution cavity by being met in solidifying soil perfusion.When concrete surface is close to framework of steel reinforcement, keep conduit
Slightly larger buried depth, and slow down speed of perfusion；After wellhole concrete face enters framework of steel reinforcement certain depth, conduit is suitably promoted, makes steel
Tendons skeleton has certain buried depth in concrete, stablizes steel reinforcement cage, prevents rising of steel cage.To ensure stake top quality, stake top perfusion mark
Height should be more superfilled more than 1m than designed elevation, observation a period of time after the completion of perfusion, if concrete surface does not change extraction conduit.
In the present embodiment, in the step S1, the setting height of the solution cavity is 10m；In the step S2, using coagulation
When soil fills the solution cavity, until concrete is higher by described 1 times of stake footpath height of Upper Plate of Karst Cave, and concrete surface no longer under
During drop, stop perfusion.
Obviously, the above embodiments are merely examples for clarifying the description, is not intended to limit the embodiments.For
For those of ordinary skill in the art, other various form variations can also be made on the basis of the above description or are become
It is dynamic.There is no necessity and possibility to exhaust all the enbodiments.And the obvious variation or change thus extended out
Among moving still in the protection domain of the invention.
Claims (10)
1. a kind of construction method of karst strata pile foundation, which is characterized in that include the following steps：
Step S1：Place hole to be drilled on karst strata drills downward vertically, and judges whether solution cavity in drilling, if depositing
S2 is then being entered step, is otherwise entering step S3；
Step S2：The height of the solution cavity is judged, if the height of the solution cavity is less than setting height, first using concrete to described
Solution cavity is filled, and when concrete is higher by the stake footpath height of the Upper Plate of Karst Cave, and concrete surface no longer declines, stops filling
Note, continuation drilling and forming hole extremely designs stake bottom after concrete reaches setting intensity；If the height of the solution cavity is more than setting height,
The method to be followed up using steel pile casting；
Step S3：The steel reinforcement cage made in advance is hung in place along the drilling；
Step S4：Sinking conduit makes the conduit close to the foot of hole, continuous into the steel reinforcement cage out of described conduit
It injects concrete and forms pile foundation.
2. the construction method of karst strata pile foundation according to claim 1, it is characterised in that：When drilling in the step S1,
To the drilling of piles with different position is using diagonal drilling on same pier, every the method for hole construction.
3. the construction method of karst strata pile foundation according to claim 2, it is characterised in that：It is described when hole is constructed, construction
During next pile base, start to construct after the intensity arrival setting intensity of upper pile base.
4. the construction method of karst strata pile foundation according to claim 2, it is characterised in that：It is long to piles with different on same pier
During construction, first construction stake length is long, solution cavity is more and the stake holes of construction hardly possible.
5. the construction method of karst strata pile foundation according to claim 1, it is characterised in that：In the step S2, steel pile casting
The method of follow-up is：When drilling through at the top of the solution cavity, the steel pile casting made is sink to bottom hole along the drilling, it will be underwater
Concrete conduit is put into the drilling, is blocked using concrete, after concrete solidifies and generates some strength, then bore, follow up steel
Casing, after the steel pile casting is with proceeding to the following setpoint distance in advance exploration solution cavity bottom, drilling to design stake bottom.
6. the construction method of karst strata pile foundation according to claim 5, it is characterised in that：It is described to drill through the solution cavity
During top, be repeatedly lifted up boring hammer, above and below top thickness scope slow play gently carry, bore hammer unobvious and be obstructed, illustrate top pore-forming
And it is round and smooth vertical, steel pile casting is pinioned with steel wire rope knot that can be undone by a pull, is put into along the drilling and sinks down into bottom hole.
7. the construction method of karst strata pile foundation according to claim 6, it is characterised in that：It is described to drill through the solution cavity
Afterwards, assembled good Underwater Concrete conduit is put into hole, is blocked using concrete, while concrete need to treat that it is laggard that front concrete reaches initial set
Row, the slump control of concrete after concrete solidifies and generates some strength, then are carried out with churning driven repeating back to brill within the specific limits,
Follow up steel pile casting.
8. the construction method of karst strata pile foundation according to claim 1, it is characterised in that：Before the step S3, institute is treated
It states after drilling reaches the designed elevation and carries out borehole cleaning.
9. the construction method of karst strata pile foundation according to claim 1, it is characterised in that：In the step S4, sinking is led
Guan Qian makees dense water experiment to the conduit.
10. according to the construction method of the karst strata pile foundation of claim 1 or 9, it is characterised in that：It is continuously injected into concrete
When, the length of embedment of the conduit is controlled, when promoting the conduit, depth of tremie is determined according to solution cavity situation.
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| CN201711407377.9A CN108086342A (en) | 2017-12-22 | 2017-12-22 | The construction method of karst strata pile foundation |
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| CN201711407377.9A CN108086342A (en) | 2017-12-22 | 2017-12-22 | The construction method of karst strata pile foundation |
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| CN108894214A (en) * | 2018-08-27 | 2018-11-27 | 孙德明 | A kind of solution cavity geological environment bored concrete pile and its bore forming method |
| CN109056706A (en) * | 2018-08-03 | 2018-12-21 | 上海宝冶集团有限公司 | A kind of Karst Geological Landscape poured pile base construction method |
| CN109629562A (en) * | 2019-01-10 | 2019-04-16 | 湖北工业大学 | A kind of cast-in-place pile construction method passing through solution cavity |
| CN110468866A (en) * | 2019-07-11 | 2019-11-19 | 中冶交通建设集团有限公司 | Pile foundation in water construction method |
| CN114673188A (en) * | 2022-03-31 | 2022-06-28 | 中铁二十局集团第二工程有限公司 | Karst area pile foundation construction method and karst area pile foundation construction device |
| CN115450204A (en) * | 2022-10-17 | 2022-12-09 | 上海宝冶集团有限公司 | Construction method for hole forming of karst cave geological concrete by recharging and matching with rotary digging of steel pile casing |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109056706A (en) * | 2018-08-03 | 2018-12-21 | 上海宝冶集团有限公司 | A kind of Karst Geological Landscape poured pile base construction method |
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| CN110468866A (en) * | 2019-07-11 | 2019-11-19 | 中冶交通建设集团有限公司 | Pile foundation in water construction method |
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| CN115450204A (en) * | 2022-10-17 | 2022-12-09 | 上海宝冶集团有限公司 | Construction method for hole forming of karst cave geological concrete by recharging and matching with rotary digging of steel pile casing |
| CN115450204B (en) * | 2022-10-17 | 2023-11-21 | 上海宝冶集团有限公司 | Construction method for rotary digging and pore forming of karst cave geological concrete recharging matched with steel casing |
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Application publication date: 20180529 |