CN110258677A - Lifting method is reinforced in the sedimentation of existing building isolated footing - Google Patents
Lifting method is reinforced in the sedimentation of existing building isolated footing Download PDFInfo
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- CN110258677A CN110258677A CN201810517527.XA CN201810517527A CN110258677A CN 110258677 A CN110258677 A CN 110258677A CN 201810517527 A CN201810517527 A CN 201810517527A CN 110258677 A CN110258677 A CN 110258677A
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- isolated footing
- reinforced
- existing building
- lifting method
- footing
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D35/00—Straightening, lifting, or lowering of foundation structures or of constructions erected on foundations
- E02D35/005—Lowering or lifting of foundation structures
Abstract
It is settled the invention discloses existing building isolated footing and reinforces lifting method, belong to building foundation and reinforces lifting technical field, it include following steps: S1 settlement measurement: according to the fiducial mark high point of scene setting, settlement measurement is carried out to each isolated footing, record settling data, differential settlement is calculated, unified elevation line is set；S2 consolidates ground: carrying out grouting and reinforcing processing to the soil body of isolated footing bottom, forms firm area；The S3 jacking of foundation: the soil body to firm area top close to isolated footing carries out injecting treatment, to be lifted isolated footing to unified elevation line, has the characteristics that stability is high, precision is high, is easy to construct, is at low cost.
Description
Technical field
The present invention relates to building foundations to reinforce lifting technical field, in particular to existing building isolated footing sedimentation is reinforced
Lifting method.
Background technique
The loess area coverage in China is larger, the east west from Qilian Mountains, Gansu Province arteries and veins is mainly distributed on, to the east of Shanxi, river
Qinling Mountains in Shaanxi, north to Great Wall, including Shaanxi, Shaanxi, Ningxia, Gansu, Qinghai etc. are supported in the Taihang mountain range in south, Hebei junction, south
A counties and cities more than the 220 of five provinces and regions, area is up to 540,000 square kilometres, 6 the percent of Zhan Quanguo land area.Northwest China
Loess plateau is worldwide largest loess plateau, and the loess plain in North China is worldwide largest loess plain.
Typical loess is dust and silty sand the particulate composition of yellow-gray or brown color, and quality is uniform, with hand rubbing easily at
Powder, it is porous containing volume is calcareous or loess concretion, there are significant vertical joints, no stratification, harder, quilt when dry
Flowing water soaks, and is typically easy to peel off and corroded, or even collapse.So carrying out various engineering constructions in Canal in Loess Area
When, often serious loss and destruction are brought to engineering.
The existing Chinese patent that can refer to Patent No. ZL201520056559.6, it discloses one kind by existing building
Isolated footing reinforce pile foundation of bearing platform plinth structure, several stake holes are provided on former isolated footing, are provided with base in stake holes
Stake, foundation pile stake top are fixed by cushion cap steel mesh, and cushion cap steel mesh is implanted into reinforcing bar, vertical dowel, stake by new-old concrete interface
Link reinforcing bar composition based on cushion cap, forms pile foundation of bearing platform plinth structure, reaches the mesh of foundation bearing force request and differential settlement
's.But this method project cost is high, and construction technology is cumbersome, long in time limit.
At present in collapsible loess foundation processing, common method further includes bed course displacement method, lime-soil compaction pile, strong rammer
Method, piling method etc., these methods played an important role in practice, but there is also a degree of deficiencies.As bed course is set
Area of the method suitable for load lesser building and underground olighydria is changed, and basis need to be excavated, construction working face is big, shadow
Ring normal operation；The compacted effect in area that lime-soil compaction pile is lower in moisture content and geology is hard is poor；Piling method economy compared with
Difference, it is at high cost in the case where collapsible loess is thicker.In addition, the stability of the above method is bad, after building delivery is applicable in,
It still will appear building uneven subsidence, cause building overall structure by different degrees of destruction, wall crazing, terrace
Situations such as sinking.
Summary of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of existing building isolated footing sedimentation reinforcing lifting method, tool
Have the characteristics that stability is high, precision is high, is easy to construct, is at low cost.
Above-mentioned technical purpose of the invention has the technical scheme that
Lifting method is reinforced in the sedimentation of existing building isolated footing, which is characterized in that includes following steps:
S1 settlement measurement: according to the fiducial mark high point of scene setting, settlement measurement is carried out to each isolated footing, records settlement number
According to calculating differential settlement sets unified elevation line；
S2 consolidates ground: carrying out grouting and reinforcing processing to the soil body of isolated footing bottom, forms firm area；
The S3 jacking of foundation: the soil body to firm area top close to isolated footing carries out injecting treatment, to be lifted isolated footing to system
One elevation line.
It is compacted by slurry infiltration during solid base slip casting by using above scheme, the gap of soil layer is filled, is starched
Form compound foundation after liquid solidification, changes the shape of soil layer, improves foundation bearing capacity and impermeability, reach foundation
Steady status, foundation soil are no longer deformed by groundwater erosion.During the jacking of foundation, to close to isolated footing the soil body into
Row slip casting, slurries are compacted again at a higher pressure, are lifted isolated footing uniformly slowly.
Building with isolated footing generally includes the biggish building of the occupied areas such as workshop, if with building bottom
The whole soil body be reinforce lifting object, process range is big, and material consumption is big, manipulation strength is big, at high cost.In the present invention, choosing
Take each isolated footing for process object, it is real by carrying out reinforcing lifting to the isolated footing a certain range of soil body below
Reinforcing, lifting and the correction of existing whole building, process range are substantially reduced, and cost substantially reduces.
In traditional disposed of in its entirety method, when the different parts of Ground Treatment entirety, it is easy to appear showing for the influence that checks and balance
As, and in method of the invention, each independent ground independent process greatly reduces influence to each other, improves reinforcing and entangles
Stability and safety during partially.
The a wide range of soil body for consolidating isolated footing bottom in advance by slip casting, avoids building from going out during subsequent construction
The case where existing secondary settlement or inclination.In reinforcing process, grouting operation is closer apart from isolated footing, can be in reduced grouting pressure
Thus lower realization reduces energy consumption, reduce construction cost.
Preferably, on the basis of unified elevation line, passing through precision level and horizontal laser light instrument in the step S3 jacking of foundation
Dual real time monitoring.
By using above scheme, strict control is lifted process, improves stability, accuracy and the safety of lifting process
Property.
Preferably, the reinforcing of isolated footing (2) infuses integrated delamination pour slurry mode, every layer of slip casting section using brill in step S2
Long 0.3-0.5m.
By using above scheme, the mode of delamination pour slurry can reduce the disturbance in boring procedure to foundation soil, keep away
Exempt to cause secondary settlement, improves construction stationarity.
Preferably, the reinforcing of isolated footing is layered using the integrated protrusive delamination pour slurry of note, reinforcement depth is bored in step S2
Downwards, every layer of slip casting segment length 0.3-0.5m；In step S3, drilling rod is retracted to 1-2m below substrate, carries out slip-casting lifting.
By using above scheme, integrated protrusive delamination pour slurry is infused using boring, from top to bottom, every one section of drilling, slip casting
One section, until completing construction in reinforcing scope, preferentially the firm upper layer soil body, significantly improves the stationarity of reinforcing process.Typically
Loess is dust and silty sand the particulate composition of yellow-gray or brown color, and quality is uniform, calcareous containing volume with the friableness of hand rubbing
Or loess concretion, it is porous, there are significant vertical joints, no stratification, harder when dry, one is soaked by flowing water, usually holds
It easily peels off and is corroded, isolated footing is caused to settle, method provided by the invention is especially suitable for the geology such as collapsible loess and dredges
The reinforcing of the building foundation settlement in loose ground area is lifted, and has very strong practice significance.
Preferably, multiple brill orifice positions are uniformly and symmetrically distributed along the vertical center of isolated footing, creep into, infuse simultaneously simultaneously
Slurry.
By using above scheme, unbalance stress during slip casting is avoided, is glanced off, can also improve slip casting efficiency, contracted
Casual labourer's phase.
Preferably, boring orifice position at the top of isolated footing, isolated footing is drilled straight down.
By using above scheme, the axis for boring orifice position is located in vertical plane, and slurries are spread around in the horizontal direction,
The earth stress of isolated footing bottom is more uniform, is conducive to the stability of firm lifting process.
Preferably, boring orifice position along isolated footing edge, isolated footing is avoided, the bottom end for boring orifice position is directed obliquely downwards towards
Close to the side at the vertical center in isolated footing.
By using above scheme, brill orifice position avoids isolated footing and drills, and does not damage to isolated footing, protects
The integrality of isolated footing is held, in addition, can also reduce drilling difficulty, improves the agility of work progress.
Preferably, firm lifting terminates after stablizing three months, settlement observation is carried out to building, final settlement is less than
10mm is determined as building and reaches stable state.
By using above scheme, settlement observation is carried out to the building after the completion of construction, further ensures that construction is completed
The stable case of firm lifting effect and building in a period of time afterwards.
Preferably, during the jacking of foundation, it is preferential to be lifted the biggish isolated footing of settling amount, when differential settlement is larger, it can divide
Stage is lifted, each rising height 2-3cm.
By using above scheme, accuracy, stability and the safety of building lifting process are further promoted.
Preferably, slip casting strengthening material is selected as inorganic matter compound slurry, grout coordinate ratio: ratio of mud 0.8:1.2, water: A material
For 1:0.6-1, A material represents other cementitious materials in addition to cement, such as curing agent, additive, according to different geological conditions and
Engineering practice adjusts grout coordinate ratio.
By using above scheme, grout coordinate ratio is adjusted according to different geological conditions and engineering practice, to adapt to apply
Work process improves construction effect.
In conclusion the invention has the following advantages:
1, in the present invention, each isolated footing is chosen for process object, by isolated footing a certain range of soil below
Body carries out reinforcing lifting, realizes the reinforcing, lifting and correction of whole building, compares tradition with the whole soil body of building bottom
For the processing method for reinforcing lifting object, process range of the invention is substantially reduced, and cost substantially reduces.
2, in traditional disposed of in its entirety method, when the different parts of Ground Treatment entirety, it is easy to appear the influence that checks and balance
Phenomenon, and in method of the invention, each independent ground independent process greatly reduces influence to each other, improves reinforcing
Stability and safety during correction；
3, delamination pour slurry mode is taken, the disturbance to the soil body can be reduced, avoid secondary settlement.Protrusive delamination pour slurry mode,
The upper layer soil body can be consolidated in advance, improves the stationarity of reinforcing process, improve consolidation effect, the mode pair of protrusive delamination pour slurry
It is especially suitable in the loose area of the geology such as Collapsible Loess District；
4, in reinforcing process, grouting operation is closer apart from isolated footing, with the existing whole soil for being directly lifted building bottom
The processing method of body is compared, and grouting pressure when lifting is relatively small, and low energy consumption for drop, and construction cost is low；
5, the present invention infuses the measures such as integrated protrusive slip casting by the settlement observation after absolute altitude control, completion, brill and improves construction
The overall stability of process.
Detailed description of the invention
Fig. 1 is the general layout schematic diagram of building isolated footing to be processed in embodiment 1；
Fig. 2 is the floor map for embodying single isolated footing in embodiment 1 and boring orifice position；
Fig. 3 is the diagrammatic cross-section that firm plot structure is embodied in embodiment 1；
Fig. 4 is the diagrammatic cross-section for embodying firm area in embodiment 1 and being lifted plot structure；
Fig. 5 is the floor map for embodying single isolated footing in embodiment 2 and boring orifice position；
Fig. 6 is the diagrammatic cross-section that firm plot structure is embodied in embodiment 2；
Fig. 7 is the diagrammatic cross-section for embodying firm area in embodiment 2 and being lifted plot structure.
In figure, 1, foundation columns；2, isolated footing；3, orifice position is bored；4, area is consolidated；41, slip casting interval；5, it is lifted area.
Specific embodiment
Below in conjunction with attached drawing, invention is further described in detail.Word "front", "rear" used in the following description,
"left", "right", "up" and "down" refer to the direction in attached drawing, what word " bottom surface " and " top surface ", "inner" and "outside" respectively referred to
Be directed towards or far from geometric center of specific component direction.
Embodiment 1
Lifting method is reinforced in the sedimentation of existing building isolated footing, includes following steps:
S1 settlement measurement: referring to Fig. 1, according to the fiducial mark high point of scene setting, for each isolated footing 2 or foundation columns 1
Settlement measurement is carried out, and records settling data, after calculating differential settlement, sets unified elevation line.
S2 consolidates ground: in conjunction with Fig. 3, integrated delamination pour slurry mode is infused using boring, to reduce the disturbance to foundation soil.Tool
Body, protrusive delamination pour slurry reinforcing mode can be used, reinforcement depth layering is downward, every one section of drilling, and one section of slip casting, every time
Slip casting segment length 0.3-0.5m forms the slip casting interval 41 that corresponding height is 0.3-0.5m, until construction in reinforcing scope is completed,
Firm area 4 is collectively formed in multi-stage cementing interval 41.Retrusive delamination pour slurry mode can also be used in work progress, i.e., first pierce
Underground, every one section of lifting, one section of slip casting, each slip casting segment length 0.3-0.5m, slip casting is completed, and drilling rod is easy to extract.And protrusive
Delamination pour slurry mode can consolidate the upper layer soil body in advance, and the area loose for geology such as Collapsible Loess Districts is especially suitable.
In conjunction with Fig. 2, bores orifice position 3 and be arranged multiple, multiple brill orifice positions 3 are symmetrically arranged along the vertical center of isolated footing 2.Bore note
Hole location 3 drills isolated footing 2 along 2 top of isolated footing straight down.Multiple brill orifice positions 3 are crept into simultaneously, while slip casting.
The S3 jacking of foundation: after stiffening basic ground is completed to form intensity (about 12-24h), by the unified elevation line of setting,
Isolated footing 2 is lifted.In conjunction with Fig. 4, when the jacking of foundation, drilling rod is retracted to 1-2m below substrate, secondary grouting is carried out,
Grouting pressure is improved, by slip casting principle, slurries are compacted again at a higher pressure, make basic uniformly slowly lifting, and shape
At corresponding lifting area 5.During the jacking of foundation: the preferential lifting biggish isolated footing 2 of settling amount；With the unified absolute altitude of setting
Line is benchmark absolute altitude, passes through precision level and the dual real time monitoring of horizontal laser light instrument；It is less than unified elevation line in lifting absolute altitude
When 2cm, it is gradually reduced grouting pressure, immediate observation scale label, lifting standard reaches unified elevation line ± 10mm；Such as differential settlement
It when larger, can be lifted stage by stage, each rising height about 2-3cm.
Settlement observation after S4 completion: after Practical Completion acceptance(check), settlement observation is carried out to building.Settlement observation can
It is carried out after firm lifting terminates to stablize three months, observes 6 months, the first two months are monthly observed 2 times, latter four months, are monthly seen
It surveys 1 time.Final settlement is less than 10mm, that is, is determined as building and reaches stable state.
Above-mentioned slip casting strengthening material is selected as inorganic matter compound slurry, grout coordinate ratio: ratio of mud 0.8:1.2, water: A material is
1:0.6-1, A material represent other cementitious materials in addition to cement, such as curing agent, additive, according to different geological conditions and work
Journey actual conditions adjust grout coordinate ratio.
Embodiment 2
Unlike the first embodiment in step S2: referring to Fig. 5, multiple brill orifice positions 3 are uniformly distributed along 2 surrounding of isolated footing, are tied
Fig. 6 is closed, orifice position 3 is bored along 2 edge of isolated footing, avoids isolated footing 2, diagonally downward, the bottom end direction for boring orifice position 3 is close
The side at the vertical center in isolated footing 2 reduces the destruction to isolated footing 2 with this, reduces construction intensity the present embodiment most end form
At firm area 4 and lifting area 5 referring to Fig. 7.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, those skilled in the art
Member can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but as long as at this
All by the protection of Patent Law in the scope of the claims of invention.
Claims (10)
1. lifting method is reinforced in the sedimentation of existing building isolated footing, which is characterized in that include following steps:
S1 settlement measurement: according to the fiducial mark high point of scene setting, settlement measurement is carried out to each isolated footing (2), record is heavy
Drop data calculates differential settlement, sets unified elevation line；
S2 consolidates ground: carrying out grouting and reinforcing processing to the soil body of isolated footing (2) bottom, forms firm area (4)；
The S3 jacking of foundation: the soil body to firm area (4) top close to isolated footing (2) carries out injecting treatment, to be lifted independent base
Plinth (2) is to unified elevation line.
2. lifting method is reinforced in existing building isolated footing sedimentation according to claim 1, it is characterised in that: step S3
In the jacking of foundation, on the basis of unified elevation line, pass through precision level and the dual real time monitoring of horizontal laser light instrument.
3. lifting method is reinforced in existing building isolated footing sedimentation according to claim 1, it is characterised in that: step S2
In, the reinforcing of isolated footing (2) infuses integrated delamination pour slurry mode, every layer of slip casting segment length 0.3-0.5m using brill.
4. lifting method is reinforced in existing building isolated footing sedimentation according to claim 3, it is characterised in that: step S2
In, the reinforcing of isolated footing (2) is layered downwards using the integrated protrusive delamination pour slurry of note, reinforcement depth is bored, every layer of slip casting segment length
0.3-0.5m；In step S3, drilling rod is retracted to 1-2m below substrate, carries out slip-casting lifting.
5. lifting method is reinforced in existing building isolated footing sedimentation according to claim 3, it is characterised in that: multiple brills
Orifice position (3) is uniformly and symmetrically distributed along the vertical center of isolated footing (2), is crept into simultaneously, while slip casting.
6. lifting method is reinforced in existing building isolated footing sedimentation according to claim 5, it is characterised in that: bore orifice
Position (3) drills isolated footing (2) at the top of isolated footing (2) straight down.
7. lifting method is reinforced in existing building isolated footing sedimentation according to claim 5, it is characterised in that: bore orifice
Position (3) is avoided isolated footing (2) along isolated footing (2) edge, and the bottom end for boring orifice position (3) is directed obliquely downwards towards close to independent
The side at basic (2) vertical center.
8. lifting method is reinforced in existing building isolated footing sedimentation according to claim 1, it is characterised in that: firm lift
It rises after terminating to stablize three months, settlement observation is carried out to building, final settlement is less than 10mm, that is, is determined as building and reaches
Stable state.
9. lifting method is reinforced in existing building isolated footing sedimentation according to claim 1, it is characterised in that: basis lift
It is preferential to be lifted the biggish isolated footing of settling amount (2) during rising, it when differential settlement is larger, is lifted, is lifted every time stage by stage
Height 2-3cm.
10. a kind of as lifting method, feature are reinforced in the described in any item existing building isolated footing sedimentations of claim 1-9
Be: slip casting strengthening material is selected as inorganic matter compound slurry, grout coordinate ratio: ratio of mud 0.8:1.2, water: A material is 1:0.6-1,
A material represents other cementitious materials in addition to cement, such as curing agent, additive, according to different geological conditions and the practical feelings of engineering
Condition adjusts grout coordinate ratio.
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| CN201810517527.XA CN110258677A (en) | 2018-05-25 | 2018-05-25 | Lifting method is reinforced in the sedimentation of existing building isolated footing |
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| CN201810517527.XA CN110258677A (en) | 2018-05-25 | 2018-05-25 | Lifting method is reinforced in the sedimentation of existing building isolated footing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942455A (en) * | 2019-12-11 | 2021-06-11 | 北京恒祥宏业基础加固技术有限公司 | Reinforcing and lifting method for karst foundation high-rise building |
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| JPH07259103A (en) * | 1994-03-16 | 1995-10-09 | Takayoshi Fujiwara | Improving method for soft ground |
| CN102061697A (en) * | 2010-11-25 | 2011-05-18 | 中铁六局集团有限公司广州分公司 | Method for treating uneven settlement of building |
| WO2017013014A1 (en) * | 2015-07-17 | 2017-01-26 | Thur S.R.L. | Method for improving the mechanical and hydraulic characteristics of foundation grounds of existing built structures |
| CN106988337A (en) * | 2017-04-20 | 2017-07-28 | 南京工业大学 | A kind of reinforcement means for being used to reduce bar shaped shallow foundation house differential settlement |
| CN207228186U (en) * | 2017-08-02 | 2018-04-13 | 北京恒祥宏业基础加固技术有限公司 | Build the slip casting composite foundation of reinforcement and rectification |
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2018
- 2018-05-25 CN CN201810517527.XA patent/CN110258677A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07259103A (en) * | 1994-03-16 | 1995-10-09 | Takayoshi Fujiwara | Improving method for soft ground |
| CN102061697A (en) * | 2010-11-25 | 2011-05-18 | 中铁六局集团有限公司广州分公司 | Method for treating uneven settlement of building |
| WO2017013014A1 (en) * | 2015-07-17 | 2017-01-26 | Thur S.R.L. | Method for improving the mechanical and hydraulic characteristics of foundation grounds of existing built structures |
| CN106988337A (en) * | 2017-04-20 | 2017-07-28 | 南京工业大学 | A kind of reinforcement means for being used to reduce bar shaped shallow foundation house differential settlement |
| CN207228186U (en) * | 2017-08-02 | 2018-04-13 | 北京恒祥宏业基础加固技术有限公司 | Build the slip casting composite foundation of reinforcement and rectification |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942455A (en) * | 2019-12-11 | 2021-06-11 | 北京恒祥宏业基础加固技术有限公司 | Reinforcing and lifting method for karst foundation high-rise building |
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