CN110387869A - A kind of high plasticity index Soft Soil Ground And Foundation processing method - Google Patents
A kind of high plasticity index Soft Soil Ground And Foundation processing method Download PDFInfo
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- CN110387869A CN110387869A CN201910714545.1A CN201910714545A CN110387869A CN 110387869 A CN110387869 A CN 110387869A CN 201910714545 A CN201910714545 A CN 201910714545A CN 110387869 A CN110387869 A CN 110387869A
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- pile
- ground
- sand
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- soft soil
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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
Abstract
The present invention relates to hydraulic engineering fields, disclose a kind of high plasticity index Soft Soil Ground And Foundation processing method, comprising steps of S1, ground are leveled；Operation field is cleared up smooth, carries out drainage system；S2, sandy pile construction is carried out on the ground, form more sand piles on the ground；S3, quality testing is carried out to sand pile；S4, mixing pile construction is carried out on sand pile, form a mixing pile in every sand pile；S5, quality testing is carried out to mixing pile.Method by using sand pile and mixing pile to combine on high plasticity index weak soil can effectively solve foundation of hydraulic structure bearing capacity and the problem of sedimentation and deformation is coordinated, foundation of water engineering works bottom plate be avoided to come to nothing and formed the hidden danger of the concentration leak paths under bottom plate.
Description
Technical field
The present invention relates to hydraulic engineering fields, more particularly to a kind of high plasticity index Soft Soil Ground And Foundation processing method.
Background technique
High plasticity index weak soil refers to the weak soil that plasticity index Ip is greater than 22, and it is big, clever to there is water content height, porosity
The features such as sensitivity is high, decrement is big, low bearing capacity.
Hydraulic structure is built on soft soil foundation, common based process has rigid concrete pile foundation and mixing pile compound
Base.The hydraulic structure of rigid concrete pile foundation processing, there are bottom plates to come to nothing, and forms the hidden of the concentration leak paths under bottom plate
Suffer from.And hydraulic structure uses mixing pile composite foundation, can effectively solve the problem of bearing capacity and sedimentation and deformation are coordinated, avoids bottom
Plate comes to nothing and is formed the hidden danger of the concentration leak paths under bottom plate.
When the Ip of weak soil is greater than 22, (four pieces of stirring blades, four stir two sprays or four stir four spray works mixing pile convention stir technique
Skill) it is difficult to ensure mixing quality, often occur altering slurry, the unequal quality accident of stirring, causes mixing pile pile quality poor, even
Stake is not become.
Summary of the invention
The object of the present invention is to provide a kind of high plasticity index Soft Soil Ground And Foundation processing method, this method is being stirred merely
It is improved on the basis of stake processing, increases sand pile, i.e. the composite foundation base processing of sand pile combination mixing pile, solve mixing pile
It is poor using convention stir technique pile quality, or even the problem of do not become, improve the conduct of mixing pile composite foundation based process
The validity and safety of the based process of hydraulic structure, especially through-dyke building.
In order to solve the above technical problem, the present invention provides a kind of high plasticity index Soft Soil Ground And Foundation processing method, packets
Include step:
S1, ground are leveled；Operation field is cleared up smooth, carries out drainage system；S2, sandy pile construction is carried out on the ground,
More sand piles are formed on the ground；S3, quality testing is carried out to sand pile；S4, mixing pile construction, every sand pile are carried out on sand pile
A piece mixing pile of interior formation；S5, quality testing is carried out to mixing pile.
Preferably, the sandy pile construction step of the step S2 includes:
S21, stake outer tube is set in outside an inner tube, the two is arranged vertically at stake holes；S22, with jump bit by stake inner tube
It is hammered onto the projected depth on ground together with stake outer tube；S23, stake inner tube is promoted, while pours into a certain amount of sand to stake outer tube
Gravel；S24, stake inner tube is protruded into an outer tube, until after touching gravel, stake outer tube is promoted into certain distance, Driven Piles inner tube,
Gravel is compacted；S25, stake inner tube is promoted, pours into gravel to stake appearance again；S26, S24 and S25 is repeated.
Preferably, the fineness modulus of the gravel is 2.3~3.7.
Preferably, the diameter of the sand pile is 600mm, and vertical missing is less than 1%.
Preferably, step S3 is carried out after the sand pile is formed 28 days.
Preferably, the quality testing of the step S3 is using heavy power detection test.
Preferably, the mixing pile construction step of the step S4 includes:
S41, test pile is carried out, cement consumption, the ratio of mud and defeated slurry amount is adjusted according to test pile；
S42, blender is directed at sand pile central point, and starts blender, so that it is pierced sand pile on one side, on one side by cement slurry
It is constantly pressed into sand pile from blender central tube；
S43, after blender is drilled into designated depth, by blender while being promoted by cement slurry from blender central tube
Constantly in indentation sand pile；
S44, after blender is promoted to ground, repeatedly S42 and S43, forms mixing pile again.
Preferably, the dosage of the cement is 60kg/m.
Preferably, the step S43 promotes blender to the 500mm that is above the ground level.
Preferably, the foundation structure includes the more sand piles being vertically arranged, and is provided with stirring in the sand pile
Stake, the central axis of the mixing pile and the central axis of sand pile are Chong Die.
The present invention provides a kind of high plasticity index Soft Soil Ground And Foundation processing method, has the advantages that
Then high plasticity index Soft Soil Ground And Foundation processing method of the invention is existed by squeezing into sand pile in weak soil in advance
Mixing pile is squeezed into sand pile, the integral construction of soft soil foundation can be made simple and convenient in this way, and in lotuses such as water pressure, soil pressures
Under load effect, sand pile and mixing pile double action can prevent the mixing pile horizontal position in weak soil mobile and sedimentation, and then prevent
Drive building horizontal displacement.
Detailed description of the invention
Fig. 1 is the flow chart of high plasticity index Soft Soil Ground And Foundation processing method provided in an embodiment of the present invention；
Fig. 2 is the sandy pile construction process of high plasticity index Soft Soil Ground And Foundation processing method provided in an embodiment of the present invention
Figure；
Fig. 3 is the mixing pile construction process of high plasticity index Soft Soil Ground And Foundation processing method provided in an embodiment of the present invention
Figure；
Fig. 4 is that the foundation structure of high plasticity index Soft Soil Ground And Foundation processing method provided in an embodiment of the present invention is overlooked
Figure；
Fig. 5 is the mixing pile structural representation of high plasticity index Soft Soil Ground And Foundation processing method provided in an embodiment of the present invention
Figure.
Appended drawing reference: 1, sand pile；2, mixing pile.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, a kind of high plasticity index Soft Soil Ground And Foundation processing method of the preferred embodiment of the present invention, including step
It is rapid:
S1, ground are leveled；Operation field is cleared up smooth, carries out drainage system；
Specifically, construction site progress is smooth, rolls or tamps, to guarantee that position of p ile machine is mobile, drilling is vertical.Mixing pile
Machine is in place；And test pile is carried out, test pile radical is 7.
S2, sandy pile construction is carried out on the ground, form more sand piles on the ground；
S3, quality testing is carried out to sand pile；
S4, mixing pile construction is carried out on sand pile, form a mixing pile in every sand pile；
S5, quality testing is carried out to mixing pile.
Specifically, mixing pile excavates pile crown using superficial part after pile 7 days, the uniformity of mixing pile is estimated, measures diameter,
Check that number is the 5% of total amount of pile；After pile 28 days, Single pile static load test and Loading Test of Composite Foundation, load test inspection are done
Quantitation is the 0.5% of total amount of pile, and single pile load test is no less than 3, and Loading Test of Composite Foundation is no less than at 3；Stirring
Stake vertical bearing capacity of single pile characteristic value should be greater than design value, and Bearing Capacity of Composite Foundation eigenvalue requirements are not less than design value.Meanwhile
After pile 28 days, using two-tube single action sampler core boring sampling, identifies supporting course soil nature, evaluate mixing uniformity, examine water
Soil compression strength, Compressive Strength of Soil-cement Mixture are no less than design value, and amount detection is the 0.5% of total amount of pile, and no less than 3
Root.
Referring to fig. 2, in a preferred embodiment of the invention, the sandy pile construction step of the step S2 includes:
S21, using two different hollow pipes of diameter as construction tool, be an outer tube and stake inner tube respectively, will be outside stake
Pipe sleeve is located at outside an inner tube, and the two is arranged vertically at stake holes；
S22, the projected depth that stake inner tube and stake outer tube are hammered onto ground together with jump bit；
S23, stake inner tube is promoted, while pours into a certain amount of gravel to stake outer tube；
S24, stake inner tube is protruded into an outer tube, until stake outer tube is promoted certain distance, Driven Piles after touching gravel
Gravel is compacted by inner tube；
Specifically, stake outer tube, which promotes speed, should control in 1.5-3.0m/mi n.
S25, stake inner tube is promoted, pours into gravel to stake appearance again；
S26, S24 and S25 is repeated.
Specifically, it is more solid that sand pile may be implemented through the above steps, and opposite other modes of constructing are more quick,
And, can be to avoid in construction work by two-tube operation because sand pile quantity is more, soft soil foundation is collapsed by construction infection,
Overall security is higher.The density of the sand pile sand obtained simultaneously using above-mentioned steps can be bigger, can in the formation of mixing pile below
Decoherence to avoid sand pile, while heavy problem can also be dropped to avoid the mixing pile later period, is further ensured that the firm of ground.
In a preferred embodiment of the invention, the fineness modulus of the gravel is 2.3~3.7.
In a preferred embodiment of the invention, the diameter of the sand pile is 600mm, and vertical missing is less than 1%.
In a preferred embodiment of the invention, step S3 is carried out after the sand pile is formed 28 days.
In a preferred embodiment of the invention, the quality testing of the step S3 is using heavy power detection test.
Specifically, the equipment of heavy dynamic penetration test mainly by contact probe, sounding rod and punching hammer form, punching hammer by
Drilling machine manipulation；Test procedure includes:
K1: before contact probe injection soil layer, the length of sounding rod is first measured；
K2, when hammer tip is driven into predicted position, mark from sounding rod, face upward the position of every 10cm from ground；
K3, punching hammer freely fall the blow counts that every injection soil layer 10cm is recorded away from 76cm；Hammering rate be preferably 15-30 hit/
mi n；
K4, when often adding a sounding rod, the length of added bar need to be recorded, counts feeler inspection pole length again；
If K5, soil property are relatively soft, contact probe penetrating speed is very fast, it also can record hammering 6 times depths of penetration；
K6, behind blow counts > 50 time, stop test.
Specifically, can use certain quality of dropping hammer by above-mentioned test procedure, by certain size, certain shapes
Probe is squeezed into soil, according to the difficulty squeezed into, i.e. injection blow counts, judges the robustness of sand pile, so that
Referring to Fig. 3, in a preferred embodiment of the invention, the mixing pile construction step of the step S4 includes:
S41, test pile is carried out, cement consumption, the ratio of mud and defeated slurry amount is adjusted according to test pile；
It is worth noting that mixing pile is formally constructed and the interval of test pile time holding 28 days, the quantity of test pile is 2,
The design parameters such as cement consumption, the ratio of mud and the defeated slurry amount of slurry pump, mortar, which are adjusted, according to test pile reaches blender through feed pipe for mortar
The time and mixing plant for starching mouth sink and its associated constructions parameters such as promotion speed.
S42, blender is directed at sand pile central point, and starts blender, on one side with the speed of 0.38~0.75m/mi n
So that it is pierced sand pile, is on one side constantly pressed into cement slurry in sand pile from blender central tube；
Specifically, should not wash by water when blender stirs sinking in advance, it is considered as influence of the bath pile to sand pile intensity.
S43, after blender is drilled into designated depth, blender is promoted on one side with the even speed of 0.3-0.5m/mi n
Cement slurry is constantly pressed into sand pile from blender central tube on one side；
S44, after blender is promoted to ground, repeatedly S42 and S43, forms mixing pile again.
Specifically, after stirring-head whitewashing stirring sinks down into an end designed elevation, then stirring of whitewashing promotes stirring-head, stops starching
Face should be higher than that design of pile top absolute altitude 500mm.It send slurry appropriate to the occasion and defeated slurry speed is controlled come k using flow pump, make slurries pump discharge pressure
It is maintained at 0.4-0.6Mpa, and mixing pile is made to promote speed and defeated slurry speed sync.
It is worth explanation, it is all since blender brownout or other reasons cause to shut down in formation of pile, make into
Stake process disruption, to prevent broken pile, after blender restarting, pile will be further continued for after deep-layer stirring leaf sinking 0.5m.
It should whitewash after cement grout reaches grout outlet and stir 30s, after cement slurry and pile-end soil are sufficiently stirred, then start to promote stirring
Head.
In a preferred embodiment of the invention, the dosage of the cement is 60kg/m.
In a preferred embodiment of the invention, the step S43 promotes blender to the 500mm that is above the ground level.
Specifically, paddling process is when construction is to 300~500mm of top range, and because top earthing pressure is smaller, mixing quality
It is universal poor.Therefore, 300~500mm of stake top absolute altitude should be higher by by stopping pulp noodle, it is necessary to manually be excavated when excavating mixing pile top
The part.
Referring to fig. 4 and Fig. 5, in a preferred embodiment of the invention, the foundation structure includes the more sand piles being vertically arranged,
Mixing pile is provided in the sand pile, the central axis of the mixing pile and the central axis of sand pile are Chong Die.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and replacement can also be made, these are improved and replacement
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of high plasticity index Soft Soil Ground And Foundation processing method, which is characterized in that comprising steps of
S1, ground are leveled；Operation field is cleared up smooth, carries out drainage system；
S2, sandy pile construction is carried out on the ground, form more sand piles on the ground；
S3, quality testing is carried out to sand pile；
S4, mixing pile construction is carried out on sand pile, form a mixing pile in every sand pile；
S5, quality testing is carried out to mixing pile.
2. high plasticity index Soft Soil Ground And Foundation processing method as described in claim 1, it is characterised in that: the step S2's
Sandy pile construction step includes:
S21, stake outer tube is set in outside an inner tube, the two is arranged vertically at stake holes；
S22, the projected depth that stake inner tube and stake outer tube are hammered onto ground together with jump bit；
S23, stake inner tube is promoted, while pours into a certain amount of gravel to stake outer tube；
S24, stake inner tube is protruded into an outer tube, until after touching gravel, stake outer tube is promoted into certain distance, in Driven Piles
Pipe, gravel is compacted；
S25, stake inner tube is promoted, pours into gravel to stake appearance again；
S26, S24 and S25 is repeated.
3. high plasticity index Soft Soil Ground And Foundation processing method as claimed in claim 2, it is characterised in that: the gravel it is thin
Spending modulus is 2.3~3.7.
4. high plasticity index Soft Soil Ground And Foundation processing method as described in claim 1, it is characterised in that: the sand pile it is straight
Diameter is 600mm, and vertical missing is less than 1%.
5. high plasticity index Soft Soil Ground And Foundation processing method as described in claim 1, it is characterised in that: the sand pile is formed
Step S3 is carried out after 28 days.
6. high plasticity index Soft Soil Ground And Foundation processing method as described in claim 1, it is characterised in that: the step S3's
Quality testing is using heavy power detection test.
7. high plasticity index Soft Soil Ground And Foundation processing method as described in claim 1, it is characterised in that: the step S4's
Mixing pile construction step includes:
S41, test pile is carried out, cement consumption, the ratio of mud and defeated slurry amount is adjusted according to test pile；
S42, blender is directed at sand pile central point, and starts blender, it is made to pierce sand pile on one side, on one side by cement slurry from stirring
The machine central tube of mixing constantly is pressed into sand pile；
S43, after blender is drilled into designated depth, blender is continuous from blender central tube by cement slurry while being promoted
It is pressed into sand pile；
S44, after blender is promoted to ground, repeatedly S42 and S43, forms mixing pile again.
8. high plasticity index Soft Soil Ground And Foundation processing method as claimed in claim 7, it is characterised in that: the use of the cement
Amount is 60kg/m.
9. high plasticity index Soft Soil Ground And Foundation processing method as claimed in claim 7, it is characterised in that: the step S43
Blender is promoted to the 500mm that is above the ground level.
10. the foundation structure of high plasticity index Soft Soil Ground And Foundation processing method as described in claim 1, it is characterised in that:
The foundation structure includes the more sand piles being vertically arranged, and mixing pile, the central axis of the mixing pile are provided in the sand pile
It is Chong Die with the central axis of sand pile.
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| CN201910714545.1A CN110387869A (en) | 2019-08-04 | 2019-08-04 | A kind of high plasticity index Soft Soil Ground And Foundation processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111636421A (en) * | 2020-05-27 | 2020-09-08 | 上海宝冶集团有限公司 | High-plasticity soft foundation cement soil mixing pile construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111636421A (en) * | 2020-05-27 | 2020-09-08 | 上海宝冶集团有限公司 | High-plasticity soft foundation cement soil mixing pile construction method |
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