CN108239989A - A kind of environment-friendly type collapsible loess foundation structure and its processing method - Google Patents
A kind of environment-friendly type collapsible loess foundation structure and its processing method Download PDFInfo
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- CN108239989A CN108239989A CN201810138546.1A CN201810138546A CN108239989A CN 108239989 A CN108239989 A CN 108239989A CN 201810138546 A CN201810138546 A CN 201810138546A CN 108239989 A CN108239989 A CN 108239989A
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- 238000003672 processing method Methods 0.000 title abstract description 4
- 238000005056 compaction Methods 0.000 claims abstract description 67
- 239000002689 soil Substances 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 9
- 102000001999 Transcription Factor Pit-1 Human genes 0.000 description 7
- 108010040742 Transcription Factor Pit-1 Proteins 0.000 description 7
- 239000011800 void material Substances 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 241001149930 Protura <class> Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 240000006909 Tilia x europaea Species 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/34—Foundations for sinking or earthquake territories
-
- 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
- E02D27/16—Foundations formed of separate piles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
-
- 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
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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)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Soil Sciences (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A kind of environment-friendly type collapsible loess foundation structure and its processing method including undisturbed soil, foundation pit and compaction pile, are undisturbed soil around foundation pit, have compaction pile in undisturbed soil.Compaction pile arranges that bed course is arranged at isolated footing lower part, and bed course lower part is real stake in original state soil layer for positive triangle blossom type.There is compaction pile around isolated footing, compaction pile is real stake and empty stake, and real stake is located at empty stake lower part.The method for processing foundation is：It lays out pile, drive piles, excavate.The present invention has the characteristics of excavated volume is small, and environment protecting is good, short time limit and low cost.
Description
Technical field
The invention belongs to foundation treatment technology fields, and in particular to a kind of environment-friendly type collapsible loess foundation structure and its place
Reason method.
Background technology
The basement process of isolated footing is carried out in China collapsible loess region, as shown in Figure 1, usually way has whole open
It digs to isolated footing absolute altitude, then drives piles in the whole field in the range of excavation；Also there is deep layer to change to fill out, this way must slope, basis amplification,
Slope retaining etc. causes earthwork excavated volume big, long in time limit, and construction cost is high.In terms of environmental protection, Dust Improvement is costly, the period
It is long；Construction equipment, mechanical movement amount are big, and the noise pollution time is long；Water resource waste is serious, and solid waste is more；Especially to winter
The dust-proof haze that subtracts in construction site increases difficulty.
Invention content
To overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of environment-friendly type collapsible loess foundation knots
Structure and its processing method have the characteristics of excavated volume is small, and environment protecting is good, short time limit and low cost.
The technical scheme is that：A kind of foundation structure of environment-friendly type collapsible loess, foundation structure include undisturbed soil, base
Hole and compaction pile are undisturbed soil around the foundation pit, have compaction pile in undisturbed soil.
The compaction pile has several, between centre-to-centre spacing be 800-1100mm, compaction pile aperture be 350-450mm；It is compacted
Stake is arranged in undisturbed soil for positive triangle blossom type.
There is foundation pit bottom surface sideline in the bottom surface of the foundation pit, and foundation pit bottom surface sideline is not intersected with compaction pile.
The compaction pile includes real stake, empty stake, and real stake is located at empty stake lower part.
There is isolated footing in the foundation pit, bed course is arranged at isolated footing lower part, and bed course is on foundation pit bottom surface, foundation pit bottom surface lower part
It is real stake.
There is compaction pile around the isolated footing, compaction pile is made of real stake and empty stake, and real stake is located at empty stake lower part.
There is isolated footing bottom surface sideline in the isolated footing bottom surface, and foundation pit bottom surface sideline is not small far from isolated footing bottom surface sideline
In 300mm.
Lay out pile range line outside the sideline of the isolated footing bottom surface, between distance be isolated footing bottom surface sideline most short side line
Length 1/4 and not less than 0.5m or 3/4 and not less than 1m.
A kind of environment-friendly type Treatment method of collapsible loess foundation, includes the following steps：
Step 1, it lays out pile：
In self-weight collapse loess place, isolated footing center line and bottom surface range first delimited, then along isolated footing bottom
The range line that lays out pile is diffused into outside the sideline of face, per side extended range more than the 3/4 of isolated footing bottom surface sideline most short side line length, and
Not less than 1m；It lays out pile in the range line that lays out pile, pile-type is compaction pile, and pile center is away from 800-1100mm, aperture 350-450mm；Cloth
It puts using positive triangle blossom type, foundation pit bottom surface sideline is extended out in isolated footing bottom surface sideline at 300mm, foundation pit bottom surface sideline and stake
When position is intersecting, foundation pit bottom surface sideline is moved to outside stake, tangent with compaction pile；
Step 2, it drives piles：
Compaction pile is made of empty stake and real stake, and empty stake is beaten between real stake top, foundation pit bottom surface sideline and the range line that lays out pile
Compaction pile；Beat compaction pile in the range of the sideline of foundation pit bottom surface, compaction pile top is had time stake；From the range line that lays out pile to isolated footing center
It drives piles in line direction；
Step 3, it excavates：
It independently excavates, digs deep to foundation pit bottom surface in the range of the sideline of each foundation pit top surface respectively.
In step 1, in non-self centred graph place, the range that lays out pile line is first to delimit isolated footing center line and bottom surface
Then range diffuses into the range line that lays out pile along outside the sideline of isolated footing bottom surface, be more than isolated footing bottom surface sideline per side extended range
Most the 1/4 of short side line length, and not less than 0.5m.
In the method for processing foundation of above-mentioned collapsible loess, should driving depth be determined according to the report that geological survey units provide
And compacted material.
Compared with prior art, the present invention is since directly from piling of beginning primitively is opened flat, piling divides real stake, empty stake and sky
Stake, compaction pile is real stake, empty stake and empty stake within foundation pit hemline range, and other than foundation pit hemline range, the bottom of foundation extends out
Compaction pile is real stake and empty stake within range, is real stake below the bottom of foundation；It constructs from outside to inside；Piling is completed, and the earthwork is dug deep
To substrate absolute altitude, sampling observation loess compactness reaches 93%-95%.Solve cost caused by current heavy excavation or strips of excavation into
This height and engineering-environment pollute, moreover it is possible to effectively eliminate the collapsibility of ground, ensure foundation bearing capacity.
Description of the drawings
Fig. 1 lays out pile plan view for existing way.
Fig. 2 lays out pile plan view for place of the present invention.
Fig. 3 lays out pile amplification view for single isolated footing.
Fig. 4 is the A-A sectional views that the isolated footing of Fig. 3 lays out pile.
Fig. 5 is piling sectional view.
In figure, 1 is undisturbed soil, and 2 be foundation pit, and 3 be compaction pile, and 3-1 is real stake, and 3-2 is empty stake, and 3-3 is empty stake, and 4 be pad
Layer, 5 be isolated footing, and 6 be isolated footing bottom surface sideline, and 7 be foundation pit bottom surface sideline, and 8 be foundation pit top surface sideline, and 9 be the model that lays out pile
Contour.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
As shown in Fig. 2, it is that a kind of place of environment-friendly type collapsible loess foundation structure lays out pile plan view.
As shown in Figure 3 and Figure 4, single isolated footing lays out pile the partial enlargement B figures of amplification view and Fig. 2, ground base junction
Structure includes undisturbed soil 1, foundation pit 2 and compaction pile 3, it is characterised in that：It is undisturbed soil 1 around the foundation pit 2, has in undisturbed soil 1 crowded
Close stake 3.
The compaction pile 3 has several, between centre-to-centre spacing be 800-1100mm, 3 aperture of compaction pile be 350-450mm；It squeezes
Close stake 3 is arranged in undisturbed soil 1 for positive triangle blossom type.
There is foundation pit bottom surface sideline 7 in the bottom surface of the foundation pit 2, and foundation pit bottom surface sideline 7 is not intersected with compaction pile 3.
The compaction pile 3 includes real stake 3-1, void stake 3-2, real stake 3-1 are located at void stake 3-2 lower parts.
There is isolated footing 5 in the foundation pit 2, bed course 4 is arranged at 5 lower part of isolated footing, and bed course 4 is on foundation pit bottom surface, foundation pit bottom
Face lower part is real stake 3-1.
There is compaction pile 3 around the isolated footing 5, compaction pile 3 is made of real stake 3-1 and void stake 3-2, real stake 3-1
In empty stake 3-2 lower parts.
There is isolated footing bottom surface sideline 6 in 5 bottom surface of isolated footing, and foundation pit bottom surface sideline 7 is away from isolated footing bottom surface sideline 6
Not less than 300mm.
Lay out pile outside isolated footing bottom surface sideline 6 range line 9, between distance it is most short for isolated footing bottom surface sideline 6
Side line length 1/4 and not less than 0.5m or 3/4 and not less than 1m.
A kind of environment-friendly type Treatment method of collapsible loess foundation, includes the following steps：
Step 1, it lays out pile：
In self-weight collapse loess place, 5 center line of isolated footing and bottom surface range first delimited, then along isolated footing bottom
The range line 9 that lays out pile is diffused into outside face sideline 6, is more than the 3/4 of the most short side line length of isolated footing bottom surface sideline 6 per side extended range,
And not less than 1m；It lays out pile in the range line 9 that lays out pile, pile-type is compaction pile 3, and pile center is away from 800-1100mm, aperture 350-
450mm；Arrangement is extended out in isolated footing bottom surface sideline 6 at 300mm using positive triangle blossom type, foundation pit bottom surface sideline 7, foundation pit
When bottom surface sideline 7 is intersected with stake position, foundation pit bottom surface sideline 7 is moved to outside stake, tangent with compaction pile 3；
Step 2, it drives piles：
Compaction pile 3 is made of empty stake 3-2 and reality stake 3-1, and empty stake 3-2 is in real stake 3-1 tops, foundation pit bottom surface sideline 7 and cloth
Compaction pile 3 is beaten between stake range line 9；Compaction pile 3 is beaten in the range of foundation pit bottom surface sideline 7, have time a 3-3 on compaction pile 3 top；From cloth
Stake range line 9 is driven piles to 5 centerline direction of isolated footing, as shown in Figure 5；
Step 3, it excavates：
It independently excavates, digs deep to foundation pit bottom surface in the range of each foundation pit top surface sideline 8 respectively.
In step 1, in non-self centred graph place, the range that lays out pile line is first to delimit 5 center line of isolated footing and bottom
Then face range diffuses into the range line 9 that lays out pile along outside isolated footing bottom surface sideline 6, be more than isolated footing bottom surface per side extended range
The 1/4 of the most short side line length of sideline 6, and not less than 0.5m.
Embodiment：
Referring to Fig. 4 and Fig. 5, using XXXX projects as example, the construction site of the engineering is in Collapsible Loess District,
The saturated yielding type in place is self-weight collapse loess, and saturated yielding grade is II grade (medium), it is desirable that the untreated collapsible loess in lower part
Surplus wet sinking volume no more than 200mm, it is the downward 8.9m of indoor Horizon that report and result of calculation processing depth are surveyed in base area, former
Design is heavy excavation and strips of excavation, is laid out pile as quincuncial pile, excavates part and all beats element earth pile, pile center is away from 900mm, stake
Diameter 400mm.
The foundation structure of collapsible loess after optimization, isolated footing 5 are located in foundation pit 2, are original state around the foundation pit 2
Soil 1 has compaction pile 3 in undisturbed soil 1.The compaction pile 3 has several, between centre-to-centre spacing be 900mm, 3 aperture of compaction pile is
400mm；Compaction pile 3 arranges that there are foundation pit bottom surface sideline 7, the base in the bottom surface of foundation pit 2 in undisturbed soil 1 for positive triangle blossom type
Do not intersect with compaction pile 3 in hole bottom surface sideline 7.Bed course 4 is arranged at 5 lower part of isolated footing, and 4 lower part of bed course is real stake 3-1.Isolated footing 5
Surrounding has compaction pile 3, and compaction pile 3 is that real stake 3-1 and void stake 3-2, real stake 3-1 are located at void stake 3-2 lower parts.
The method for processing foundation of collapsible loess after optimization, includes the following steps：
Step 1, it lays out pile：
In self-weight collapse loess place, 5 bottom surface range of isolated footing first delimited, then along isolated footing bottom surface sideline 6
Outer to diffuse into the range line 9 that lays out pile, extended range is 3/4 of the most short side line length more than isolated footing bottom surface sideline 6；From independent base
5 bottom surface of plinth starts to lay out pile to 9 direction of range line that lays out pile, and pile-type is compaction pile 3, and pile center is away from 900mm, aperture 400mm；Arrangement
Using positive triangle blossom type, foundation pit bottom surface sideline 7 is extended out in isolated footing bottom surface sideline 6 at 300mm, foundation pit bottom surface sideline 7 with
Stake position is intersected, and foundation pit bottom surface sideline 7 is moved to outside stake, tangent with compaction pile 3.
Step 2, it drives piles：
Site of Collapsible Loess except foundation pit bottom surface sideline 7, compaction pile 3 are made of empty stake 3-2 and reality stake 3-1, empty stake
3-2 beats compaction pile 3 between real stake 3-1 tops, foundation pit bottom surface sideline 7 and the range line 9 that lays out pile；In the range of foundation pit bottom surface sideline 7
Compaction pile 3 is beaten, have time a 3-3 on compaction pile 3 top；From laying out pile, range line 9 is driven piles to 5 centerline direction of isolated footing, and stake is deep
9.5m。
Step 3, it excavates：
It is independently excavated in the range of each foundation pit top surface sideline 8 respectively, digs deeply to foundation pit bottom surface, then do 500mm thickness
3：7 cushion limes.
After applying the present invention, this project cost reduces by 1/2, and the earthwork and piling amount also accordingly reduce 1/2, and the duration shortens 20
My god (referring to the following table 1).
1 XXXX project grounds of table handle contrast table
Explanation of nouns：
Undisturbed soil：Original soil without disturbance, including collapsible loess, miscellaneous fill, plantation soil etc..
Collapsible loess：Under a certain pressure by water-soaked, soil structure is destroyed rapidly, and generates the Huang of significantly additional sinking
Soil.
Self-weight collapse loess：Significantly added obtaining collapsibility by water-soaked, generation under the gravity pressure of upper earthing
Loess.
Non-self centred graph：By water-soaked under the gravity pressure of upper earthing, do not occur significantly to add wet
Fall into property loess.
Plain soil：To can be used for the undisturbed soil of backfill after tested.
Empty stake：For compaction pile void stake top stake holes part, after compaction pile pile, sky dress part is all excavated.
Empty stake：The part for loosening soil is reserved on real stake top, assists pile.
Real stake：For the actually active compacted part of compaction pile.
Compaction pile：It is that the steel pipe with pipe close, valve or conehead is pressed into or be driven underground secret soil layer to form hole, then
Launched in hole the fillers such as plain soil into stake.
Claims (10)
1. a kind of foundation structure of environment-friendly type collapsible loess, foundation structure includes undisturbed soil (1), foundation pit (2) and compaction pile
(3), it is characterised in that：It is undisturbed soil (1) around the foundation pit (2), has compaction pile (3) in undisturbed soil (1).
A kind of 2. foundation structure of environment-friendly type collapsible loess according to claim 1, which is characterized in that the compaction pile
(3) have several, between centre-to-centre spacing be 800-1100mm, compaction pile (3) aperture be 350-450mm；Compaction pile (3) is in undisturbed soil
(1) it is arranged in for positive triangle blossom type.
A kind of 3. foundation structure of environment-friendly type collapsible loess according to claim 1, which is characterized in that the foundation pit
(2) there is foundation pit bottom surface sideline (7) in bottom surface, and foundation pit bottom surface sideline (7) is not intersected with compaction pile (3).
A kind of 4. foundation structure of environment-friendly type collapsible loess according to claim 1, which is characterized in that the compaction pile
(3) including real stake (3-1), empty stake (3-2), real stake (3-1) is positioned at empty stake (3-2) lower part.
A kind of 5. foundation structure of environment-friendly type collapsible loess according to claim 1, which is characterized in that the foundation pit
(2) there is isolated footing (5) in, bed course (4) is arranged at isolated footing (5) lower part, and bed course (4) is on foundation pit bottom surface, foundation pit bottom surface lower part
It is real stake (3-1).
A kind of 6. foundation structure of environment-friendly type collapsible loess according to claim 5, which is characterized in that the independence
There is compaction pile (3) around basic (5), compaction pile (3) is made of real stake (3-1) and empty stake (3-2), and real stake (3-1) is positioned at empty stake
(3-2) lower part.
A kind of 7. foundation structure of environment-friendly type collapsible loess according to claim 5, which is characterized in that the isolated footing
(5) there is isolated footing bottom surface sideline (6) in bottom surface, and foundation pit bottom surface sideline (7) is away from isolated footing bottom surface sideline (6) not less than 300mm.
A kind of 8. foundation structure of environment-friendly type collapsible loess according to claim 7, which is characterized in that the independent base
Lay out pile outside plinth bottom surface sideline (6) range line (9), between distance be the 1/4 of isolated footing bottom surface sideline (6) most short side line length
And not less than 0.5m or 3/4 and not less than 1m.
9. a kind of environment-friendly type Treatment method of collapsible loess foundation, which is characterized in that include the following steps：
Step 1, it lays out pile：
In self-weight collapse loess place, isolated footing (5) center line and bottom surface range first delimited, then along isolated footing bottom surface
The range line (9) that lays out pile is diffused into outside sideline (6), is more than isolated footing bottom surface sideline (6) most short side line length per side extended range
3/4, and not less than 1m；It lays out pile in the range line (9) that lays out pile, pile-type is compaction pile (3), and pile center is away from 800-1100mm, hole
Diameter 350-450mm；Using positive triangle blossom type, foundation pit bottom surface sideline (7) extends out arrangement in isolated footing bottom surface sideline (6)
At 300mm, when foundation pit bottom surface sideline (7) is intersected with stake position, foundation pit bottom surface sideline (7) is moved to outside stake, tangent with compaction pile (3)；
Step 2, it drives piles：
Compaction pile (3) is made of empty stake (3-2) and real stake (3-1), and empty stake (3-2) is in real stake (3-1) top, foundation pit bottom surface sideline
(7) compaction pile (3) is beaten between the range line (9) that lays out pile；Compaction pile (3), compaction pile (3) are beaten in the range of foundation pit bottom surface sideline (7)
Top is had time stake (3-3)；From laying out pile, range line (9) is driven piles to isolated footing (5) centerline direction；
Step 3, it excavates：
It independently excavates, digs deep to foundation pit bottom surface in the range of each foundation pit top surface sideline (8) respectively.
A kind of 10. environment-friendly type Treatment method of collapsible loess foundation according to claim 9, which is characterized in that step 1
In, in non-self centred graph place, the range that lays out pile line is first to delimit isolated footing (5) center line and bottom surface range, then
The range line (9) that lays out pile is diffused into outside along isolated footing bottom surface sideline (6), is more than isolated footing bottom surface sideline (6) per side extended range
Most the 1/4 of short side line length, and not less than 0.5m.
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| CN201810138546.1A CN108239989B (en) | 2018-02-10 | 2018-02-10 | Environment-friendly collapsible loess foundation structure and treatment method thereof |
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| CN201810138546.1A CN108239989B (en) | 2018-02-10 | 2018-02-10 | Environment-friendly collapsible loess foundation structure and treatment method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108824173A (en) * | 2018-08-08 | 2018-11-16 | 中铁五局集团有限公司 | Beam buttress system is deposited with pipe pile foundation for a kind of collapsible loess stratum |
| CN112962654A (en) * | 2021-02-22 | 2021-06-15 | 中建三局集团有限公司 | Construction method for foundation treatment |
| CN115859453A (en) * | 2023-02-24 | 2023-03-28 | 陕西华邦建设工程有限公司 | BIM-based foundation waterproof curtain design method and system |
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