CN108842802A - Piles in Karst Region base construction method - Google Patents
Piles in Karst Region base construction method Download PDFInfo
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- CN108842802A CN108842802A CN201811049191.5A CN201811049191A CN108842802A CN 108842802 A CN108842802 A CN 108842802A CN 201811049191 A CN201811049191 A CN 201811049191A CN 108842802 A CN108842802 A CN 108842802A
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- casing
- hole
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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
- 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)
- 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)
- Piles And Underground Anchors (AREA)
Abstract
The present invention provides a kind of Piles in Karst Region base construction methods, are easy to construct, while easy for construction, construction cost is effectively reduced, greatly improve construction quality.It includes the following steps：In designated position using casing outside vibration hammer inserting piling, verticality is controlled by guiding facility, soft modeling layer is passed through, into hard plastic layer；Utilize churning driven expanded hole to 1.0 meters of basement rock of top layer's solution cavity top；It is spudded in outer casing using drilling machine repeated stock pulping, carries out borehole cleaning behind whole hole in time, formed duct, the inner wall in duct is tamped；Casing in transferring, uniformly distributed more Grouting Pipes, the verticality of casing is respectively saved using horizontal ruler strict control around interior casing, avoids casing deflection using spacer bar and drilled-hole inspecting instrument；Interior casing and expansion interporal lacuna fill rubble, utilize four pvc pipe consolidation groutings reserved on the outside of interior casing；Multiple throwing is drilled through with impact and squeezes drilling to stake bottom absolute altitude, and be in the milk pile.
Description
Technical field
The present invention relates to a kind of pile base construction methods, more particularly, to a kind of Piles in Karst Region base construction method.
Background technique
Karst region pile foundation construction, solution cavity quantity is more, distribution is wide, and the long range of stake is big, pile foundation underground layer multiplicity, stake diameter multiplicity.
According to the analysis and research to survey data, engineering construction difficult point has the following aspects：
1. crack spillage.When Karst area pile foundation construction, because of the presence of solution cavity, in pore forming process be easy spillage, this will at
Hole construction brings a series of security-hidden trouble, so how to control spillage problem in pore forming process, reduces the shadow to pore-forming
Sound is a difficult point in Karst area pile foundation construction.
2, collapse hole.In pore forming process, once spillage occurs, head decline in hole, it is easy to cause the hole that collapses, how in time
Processing makes its hole that do not collapse, and guarantees that the smooth pore-forming of stake holes is another difficult point in Karst area pile foundation construction.
3, undergauge.The stratum lower caldding layer that pile foundation passes through is thicker, and most is cohesive soil, clay, flour sand, when pore-forming
Bad rate of penetration is such as controlled, stake holes is easy to appear undergauge, will affect steel reinforcement cage decentralization when serious.
Summary of the invention
In order to solve the technical problems such as existing karst region pile foundation construction spillage, the hole that collapses, undergauge, the present invention provides a kind of rocks
Molten area's pile base construction method, is easy to construct, while easy for construction, construction cost is effectively reduced, greatly improve construction quality.
The invention is realized by the following technical scheme：
A kind of Piles in Karst Region base construction method, includes the following steps：
Step 1：In designated position using casing outside vibration hammer inserting piling, verticality is controlled by guiding facility, passes through soft modeling layer, into
Enter hard plastic layer；
Step 2：Utilize churning driven expanded hole to 1.0 meters of basement rock of top layer's solution cavity top；
Step 3：It is spudded in outer casing using drilling machine repeated stock pulping, carries out borehole cleaning behind whole hole in time, form duct, device to hole
The inner wall in road is tamped；
Step 4：Casing in transferring, uniformly distributed more Grouting Pipes, respectively save casing using horizontal ruler strict control around interior casing
Verticality avoids casing deflection using spacer bar and drilled-hole inspecting instrument；
Step 5：Interior casing and expansion interporal lacuna utilize four PVC reserved on the outside of interior casing using manually 2-4cm rubble is filled
Pipe consolidation grouting, backfill is not less than the clay of 10m in interior casing before consolidation grouting, and is compacted using tup.
Step 6：Multiple throwing is drilled through with impact and squeezes drilling to stake bottom absolute altitude, and be in the milk pile.
On the basis of above-mentioned Piles in Karst Region base construction method, outer casing, outer casing internal diameter D=d+ are set in designated position
70cm, d are design stake diameter, bury stagnant depth base area expression condition and soft modeling layer situation, general control is in 15m.
On the basis of above-mentioned Piles in Karst Region base construction method, after burying outer casing, churning driven is recycled to carry out expansion pore-forming,
Expand punching hole diameter D "=d+50cm, d is design stake diameter.
On the basis of above-mentioned Piles in Karst Region base construction method, interior casing merogenesis is hung to expanded hole using crawler crane,
Every section length is 10~15 meters, and internal diameter D '=d+20cm of interior casing, d are design stake diameter, uniformly distributed four PVC slip castings around casing
Pipe positions spacing 50cm, using φ 12mm steel bar welding along 6 spacer bars are evenly arranged casing week every 2m on the outside of casing
It connects, and at any time with the verticality of drilled-hole inspecting instrument detection casing.
On the basis of above-mentioned Piles in Karst Region base construction method, wall thickness δ=12-18mm of outer casing and interior casing, thickness root
It is specifically determined according to hole depth and aperture, outer casing and interior casing are concentrated in processing station-service machinery using steel plate and roll processing and fabricating, weld
Stitch all double grooves.
The advantage of the invention is that：
1, in terms of construction speed, the casing scheme used time is shorter, and treatment effect is preferable, can save project inputs, has preferable
Economic effect；
2, it constructs using site machinery and personnel, is conducive to large area and carries out work surface, and construction technology comparative maturity
Reliably, easy to operate, shorten construction period.
3, the pile foundation under bearing capacity of pile foundation and marine environment can be improved in the casing in casing scheme and rubble consolidation grouting concrete
Anti-corrosion ability has a large promotion value.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.
Fig. 1 is that the schematic diagram after outer casing is buried in step 1；
Fig. 2 is the schematic diagram in step 2 after expanded hole；
Fig. 3 is interior casing and Grouting Pipe schematic top plan view in step 4；
Fig. 4 is casing and the schematic diagram after Grouting Pipe in transferring in step 4；
Fig. 5 is filling rubble and the schematic diagram after consolidation grouting in step 5；
Fig. 6 is the schematic diagram after being in the milk pile.
Appended drawing reference：1, soft modeling layer；2, hard plastic layer；3, karst region；4, outer casing；5, rubble；6, interior casing；7, slip casting
Pipe；8, expanded hole；9, stake；10, clay.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
A kind of Piles in Karst Region base construction method, includes the following steps：
Step 1：In designated position using casing 4 outside vibration hammer inserting piling, verticality is controlled by guiding facility, passes through soft modeling layer 1,
Into hard plastic layer 2；
Step 2：Utilize churning driven expanded hole 8 to 1.0 meters of basement rock of top layer's solution cavity top；
Step 3：It is spudded in outer casing 4 using drilling machine repeated stock pulping, carries out borehole cleaning behind whole hole in time, form duct, it is right
The inner wall in duct is tamped；
Step 4：Casing 6 in transferring, uniformly distributed more Grouting Pipes 7, respectively save casing using horizontal ruler strict control around interior casing 6
Verticality, casing deflection is avoided using spacer bar and drilled-hole inspecting instrument；
Step 5：Interior casing 6, using manually 2-4cm rubble 5 is filled, utilizes four reserved on the outside of interior casing 6 with 8 gap of expanded hole
Root pvc pipe consolidation grouting, the interior inner backfill of casing 6 is not less than the clay 10 of 10m before consolidation grouting, and is compacted using tup, this side
Case can guarantee to form stake holes support system with interior casing 6, it is ensured that after the breakdown of solution cavity rock stratum top layer, prevent rapidly spillage, make
It is unstable at upper layer, there is collapse hole phenomenon；
Step 6：Multiple throwing is drilled through with impact and squeezes drilling to stake bottom absolute altitude, and be in the milk pile 9.
In the present embodiment, outer casing 4 is set in designated position, outer casing 4 internal diameter D=d+70cm, d are design stake diameter, are buried stagnant
Depth base area expression condition and soft 1 situation of modeling layer, general control is in 15m.
In the present embodiment, after burying outer casing 4, churning driven is recycled to carry out expansion pore-forming, expand punching hole diameter D "=d+
50cm, d are design stake diameter.
In the present embodiment, interior 6 merogenesis of casing is hung to expanded hole 8 using crawler crane, every section length is 10~15 meters,
Internal diameter D '=d+20cm of interior casing 6, d are design stake diameter, uniformly distributed four PVC Grouting Pipes 7 around casing, on the outside of casing every
2m positions spacing 50cm, using φ 12mm reinforcement welding, and is examined at any time with pore-forming along 6 spacer bars are evenly arranged casing week
The verticality of instrument detection casing is surveyed, in two sections in 6 welding process of casing, lower part casing is leveled with parallels（It is adjusted with crane）,
Within the scope of external fixture that top casing is tentatively in place after reaching level requirement with horizontal ruler detection, longitude and latitude is used in interface alignment
Instrument measures verticality, and such as the requirement of verticality supergage, then interface position is leveled using parallels, then by two section casing spot welding, just
It after step is stablized, then is fully welded, after weld seam is cooling, carries out the decentralization construction of casing, above-mentioned operation circulation carries out.
In the present embodiment, wall thickness δ=12-18mm of outer casing 4 and interior casing 6, thickness is specifically true according to hole depth and aperture
Fixed, outer casing 4 and interior casing 6 are concentrated in processing station-service machinery using steel plate and roll processing and fabricating, all double grooves of weld seam.
The present invention is by using double casing processing schemes, and to weak formation effective support, even if encountering solution cavity, mud is suddenly
After a large amount of losses, weak formation will not collapse around casing, through multiple throwing clay, slabstone, repeatedly after drilling and forming hole, by solution cavity
Position filling is closely knit, it is ensured that pile foundation drilling and forming hole.For medium-sized solution cavity：First to pore-forming at the top of solution cavity, then the steel pile casting that follows up is to molten
Basement rock is pushed up in hole, then drills through Upper Plate of Karst Cave with small stroke, if mud loss in drilling process, mud should be replenished in time, and repeatedly
Throwing slabstone, clay block, cement or concrete filling it is compacted after drilling and forming hole again.For the larger or sugarcoated haws beading of solution cavity height
Solution cavity, first administered using medium-sized solution cavity method, if effect is unobvious, the progressive method of multilayer steel pile casting can be used when necessary and bore
Into.
Finally it should be noted that：The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (5)
1. a kind of Piles in Karst Region base construction method, it is characterized in that：Include the following steps：
Step 1：In designated position using casing outside vibration hammer inserting piling, verticality is controlled by guiding facility, passes through soft modeling layer, into
Enter hard plastic layer；
Step 2：Utilize churning driven expanded hole to 1.0 meters of basement rock of top layer's solution cavity top；
Step 3：It is spudded in outer casing using drilling machine repeated stock pulping, carries out borehole cleaning behind whole hole in time, form duct, device to hole
The inner wall in road is tamped；
Step 4：Casing in transferring, uniformly distributed more Grouting Pipes, respectively save casing using horizontal ruler strict control around interior casing
Verticality avoids casing deflection using spacer bar and drilled-hole inspecting instrument；
Step 5：Interior casing and expansion interporal lacuna utilize four PVC reserved on the outside of interior casing using manually 2-4cm rubble is filled
Pipe consolidation grouting, backfill is not less than the clay of 10m in interior casing before consolidation grouting, and is compacted using tup；
Step 6：Multiple throwing is drilled through with impact and squeezes drilling to stake bottom absolute altitude, and be in the milk pile.
2. Piles in Karst Region base construction method according to claim 1, it is characterized in that：Outer casing is set in designated position, outside
Casing internal diameter D=d+70cm, d are design stake diameter, bury stagnant depth base area expression condition and soft modeling layer situation, general control is in 15m.
3. Piles in Karst Region base construction method according to claim 1, it is characterized in that：After embedded outer casing, rotary digging is recycled
Drilling row expands pore-forming, expands punching hole diameter D "=d+50cm, and d is design stake diameter.
4. Piles in Karst Region base construction method according to claim 1, it is characterized in that：Interior casing merogenesis is hung using crawler crane
It puts to expanded hole, every section length is 10~15 meters, and internal diameter D '=d+20cm of interior casing, d are to design stake diameter, around casing
Four PVC Grouting Pipes of cloth position spacing 50cm along 6 spacer bars are evenly arranged casing week every 2m on the outside of casing, use
φ 12mm reinforcement welding, and at any time with the verticality of drilled-hole inspecting instrument detection casing.
5. Piles in Karst Region base construction method according to any one of claims 1 to 4, it is characterized in that：Outer casing and interior casing
Wall thickness δ=12-18mm, thickness specifically determines according to hole depth and aperture, and outer casing and interior casing are using steel plate in processing station-service machine
Tool concentration rolls processing and fabricating, all double grooves of weld seam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811049191.5A CN108842802A (en) | 2018-09-10 | 2018-09-10 | Piles in Karst Region base construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811049191.5A CN108842802A (en) | 2018-09-10 | 2018-09-10 | Piles in Karst Region base construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108842802A true CN108842802A (en) | 2018-11-20 |
Family
ID=64189104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811049191.5A Pending CN108842802A (en) | 2018-09-10 | 2018-09-10 | Piles in Karst Region base construction method |
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| CN (1) | CN108842802A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109537615A (en) * | 2019-01-14 | 2019-03-29 | 中铁建设集团有限公司 | Improve the construction method of karst or crushed zone area pile foundation first-time qualification rate |
| CN111074875A (en) * | 2020-01-21 | 2020-04-28 | 中化岩土集团股份有限公司 | Method for processing soft lower lying layer by clamping and embedding type pile |
| CN113445488A (en) * | 2021-07-16 | 2021-09-28 | 中铁六局集团有限公司 | Method for treating underground pipeline or karst cave |
| CN114753355A (en) * | 2022-05-13 | 2022-07-15 | 中铁十一局集团有限公司 | Construction method for pile foundation of thick and soft soil layer |
| CN115110518A (en) * | 2022-06-15 | 2022-09-27 | 中交二航局广西建设工程有限公司 | Construction method for underwater strongly weathered rock stratum steel sheet pile by using rotary drilling rig |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109537615A (en) * | 2019-01-14 | 2019-03-29 | 中铁建设集团有限公司 | Improve the construction method of karst or crushed zone area pile foundation first-time qualification rate |
| CN111074875A (en) * | 2020-01-21 | 2020-04-28 | 中化岩土集团股份有限公司 | Method for processing soft lower lying layer by clamping and embedding type pile |
| CN113445488A (en) * | 2021-07-16 | 2021-09-28 | 中铁六局集团有限公司 | Method for treating underground pipeline or karst cave |
| CN114753355A (en) * | 2022-05-13 | 2022-07-15 | 中铁十一局集团有限公司 | Construction method for pile foundation of thick and soft soil layer |
| CN115110518A (en) * | 2022-06-15 | 2022-09-27 | 中交二航局广西建设工程有限公司 | Construction method for underwater strongly weathered rock stratum steel sheet pile by using rotary drilling rig |
| CN115110518B (en) * | 2022-06-15 | 2024-06-25 | 中交二航局广西建设工程有限公司 | Method for constructing underwater strong weathered rock stratum steel sheet pile by using rotary drilling rig |
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Application publication date: 20181120 |
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