CN104563132B - The method and its support system of a kind of structure model selection of compound deep foundation pit support - Google Patents
The method and its support system of a kind of structure model selection of compound deep foundation pit support Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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Abstract
The invention provides the method and its support system of a kind of structure model selection of compound deep foundation pit support；First, design is considered：Secondly, the intensity comprehensive selection of structure model selection：Again, the stable Sexual behavior mode of structure model selection：Then：Control the method choice of deformation：Finally：The contour connection selection of composite support：A kind of compound system of deep foundation pit support, support system includes series connection supporting.The present invention proposes and mainly traditional single foundation pit supporting method is improved, the composite supporting construction being combined using various single foundation pit supporting methods, make full use of the advantage of each single supporting construction, propose the system of selection of a set of Composite Foundation Pit supporting construction, maximizing the benefits is realized in terms of economy, technology and construction technology are comprehensive, the development of foundation pit supporting construction is promoted, this method for designing is simple, safe and reliable, accuracy is high, strong applicability.
Description
Technical field
The present invention relates to construction engineering technical field, and in particular to a kind of side of the structure model selection of compound deep foundation pit support
Method and its support system.
Background technology
Deep foundation pit support refers to ensure the safety of Underground Construction and foundation ditch surrounding enviroment, to deep-foundation side wall and week
Supporting and retaining system, reinforcing and the measure protected that surrounding environment is used.Construction of Deep Excavation Engineering Frequent Accidents, and accident once generation, pole
The dead group's wound of group is easily caused, consequence is quite serious, to find out its cause, mainly various safety pre-controls are arranged in arrangement and method for construction and work progress
Apply not in place.Required according to the provisions of the relevant regulations issued by the State, Construction of Deep Excavation Engineering must work out supervision regulations, specify deep-foundation pit engineering
Technical requirements and the key check points of job site.
The composite supporting construction combined by various single supporting construction, can give full play to various supporting construction
Function, plays a part of " maximizing favourable factors and minimizing unfavourable ones ".
Meanwhile, it is necessary to consider that the various situations in periphery make comprehensive descision during design composite support system, select support system
Type.
The content of the invention
For the deficiencies in the prior art, it is an object of the invention to provide a kind of structure choosing of compound deep foundation pit support
The method and its support system of type, it solves these above-mentioned problems.
The technical solution adopted in the present invention is as follows：
A kind of method of the structure model selection of compound deep foundation pit support,
First, design is considered：
During design composite support system, structure type, base form and buried depth and the foundation ditch of periphery existing building are being considered
Distance, it is comprehensive to branch in terms of technology, economy and construction technology three after the form and buried depth of pipeline and the distance of foundation ditch
Watch box system carries out type selecting, selects qualified Optimum Support structure, correspondingly by technical indicator, economic indicator and construction technology
Index combine overall performane as type selecting standard；
Secondly, the intensity comprehensive selection of structure model selection：
Including：
(1) balance of horizontal direction power：When the calculating of each supporting construction is carried out, can be by effect of other supporting construction etc.
Imitate as load form is acted in the supporting construction, and acting on the power in each supporting construction will balance, and foundation pit supporting construction
The power of middle consideration is mainly horizontally oriented power, so each overall power in the horizontal direction of single supporting construction in composite supporting construction
Balance；
(2) bending resistance and shearing resistance is checked：Indivedual supporting construction also need to carry out section except checking the balance external of horizontal direction power
Bending resistance checking computations and shearing resistance are checked；
Again, the stable Sexual behavior mode of structure model selection：
Carry out that stability is worthwhile after excavation of foundation pit, now consider the contact each other of some support structure, fully examine
Consider the influence between them, the stability after influence of the supporting construction to another supporting construction is calculated respectively, now calculated
Journey：A point calculation is first carried out to respective stability, a point calculation is divided into main structure by the size for acting on the soil body in each supporting construction
With secondary structure, main structure control global stability, secondary structure control a small range stabilization is now contemplated that change each other
Shape and coordination, now equivalent to worthwhile；
(1) stability against sliding is worthwhile：
Potential water use is calculated using Sweden's circular arc Swedish method：
∑MAntiskid i=M1+M2+M3+......+Mi∑MAntiskid j=M '1+M′2+M′3+......+M′j
Wherein：MiResisting moment of i-th group of drag to sliding surface center；
M′i--- slip moment of the jth group external force to whole slide face center；
Ki--- the minimum factor of safety against sliding of specification regulation；
(2) stability against overturning is worthwhile：
∑MThe anti-i that inclines=M1+M2+M3+......+Mi∑MTopple j=M '1+M′2+M′3+......+M′j
Wherein：Mi--- resistance to tipping moment of i-th group of drag to pivot；
M′j--- tilting moment of the jth group external force to pivot；
K2--- the minimum Resistant heave safety coefficient of specification regulation；
(3) substrate resistance to chloride ion is worthwhile
Basement high stability is pull-type by normal anchor or brace type supporting construction is checked by code requirement, cantilever knot
Structure need not be checked；
Then：Control the method choice of deformation：
Supporting construction is decomposed into main structure and secondary structure, secondary structure control office by the contribution controlled overall deformation
In the range of portion deform, main structure control entire scope in deformation, by other supporting construction in calculating process, including main structure or its
The influence of its time structure is equivalent to power and acts in this supporting construction；
Finally：The contour connection selection of composite support：
Classification and deformation according to composite support are calculated it is recognised that the relation of each supporting construction is very close, multiple
The presence for closing supporting construction changes the force-mechanism of original single supporting construction, and corresponding Latent destruction position can also occur partially
Move, to consider the border contact between them, the influence of adjacent supporting construction is represented using influence coefficient.
Beneficial effects of the present invention include：
The present invention proposes and mainly traditional single foundation pit supporting method is improved, using various single pattern foundation pit supporting structure sides
The composite supporting construction system that method is combined, makes full use of the advantage of each single supporting construction, it is proposed that a set of Composite Foundation Pit branch
The system of selection of protection structure, maximizing the benefits is realized in terms of economy, technology and construction technology are comprehensive, promotes foundation pit supporting construction
Development, this method for designing is simple, safe and reliable, accuracy is high, strong applicability.There are following features simultaneously：
Destruction blocking：Single supporting construction occurs potential water use in digging process, and the safety of this sliding surface is
Number is not high, and original potential water use can be changed after using composite supporting construction, and corresponding destruction position can shift, and process
If, safety coefficient now can be improved on the basis of original.
Break through limitation：Single supporting has the corresponding scope of application, if not in this scope of application, supporting construction without
Method has given play to the effect of itself, such as：When upper strata, silt soil is thicker, when lower floor's sandy soil is more, when solely using anchor pole,
Upper strata cannot play its effect, and construction space is too small when all using inner support.And bottom anchor pole is added using top inner support
Mode can break through the limitation of their own, play its advantage.
Work according to his ability：Corresponding composite support is used according to engineering practice, various supporting construction can be given full play to
Function, play a part of " maximizing favourable factors and minimizing unfavourable ones ".
It is economic and practical：Single supporting has the inferior position of oneself, then needs to control to deform and settle by increasing " amount ",
Corresponding financial cost can increase, such as：During using cantilever supporting pile, when foundation pit deformation it is too big, it is necessary to increase stake diameter and
Length, or increase arrangement of reinforcement in stake, but it is unsatisfactory to reduce the result of displacement by these methods.And use composite support
When, financial cost is not only low, and corresponding foundation ditch periphery displacement is also much smaller.
Duration is reduced：Low, the easy construction using composite support financial cost, the characteristics of give full play to each supporting construction, phase
The duration answered can reduce.
Construct in convenient (increase space)：When foundation ditch is strict to construction space and foundation pit deformation requirement, soil condition is bad
In the case of, using the composite supporting construction mode of inner support Composite Bolt, than using single inner support or single use anchor pole
Bigger construction space and smaller foundation pit deformation can be obtained.
Brief description of the drawings
Fig. 1 is a kind of method of structure model selection of compound deep foundation pit support of the present invention and its series connection supporting knot of support system
Structure schematic diagram；
Fig. 2 is a kind of method of structure model selection of compound deep foundation pit support of the present invention and its supporting knot in parallel of support system
Structure schematic diagram；
Fig. 3 is a kind of connection in series-parallel supporting of the method and its support system of the structure model selection of compound deep foundation pit support of the present invention
Structural representation；
Fig. 4 is a kind of method of structure model selection of compound deep foundation pit support of the present invention and its knot of embodiment one of support system
Structure schematic diagram；
Fig. 5 is a kind of method of structure model selection of compound deep foundation pit support of the present invention and its knot of embodiment two of support system
Structure schematic diagram；
Fig. 6 is a kind of method of structure model selection of compound deep foundation pit support of the present invention and its knot of embodiment three of support system
Structure schematic diagram；
Fig. 7 is a kind of method of structure model selection of compound deep foundation pit support of the present invention and its example IV knot of support system
Structure schematic diagram；
Fig. 8 is the main structure control of the method and its support system of a kind of structure model selection of compound deep foundation pit support of the present invention
Deformation schematic diagram；
Fig. 9 is a kind of secondary structure control of the method and its support system of the structure model selection of compound deep foundation pit support of the present invention
Deformation schematic diagram.
In figure：1- series connection supportings；2- parallel connection supportings；3- connection in series-parallel supportings.
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.
A kind of method of the structure model selection of compound deep foundation pit support,
First, design is considered：
During design composite support system, structure type, base form and buried depth and the foundation ditch of periphery existing building are being considered
Distance, after the actual conditions such as the form and buried depth of pipeline and the distance of foundation ditch, from technology, economy and construction technology, synthesis side
Carry out type selecting in face of support system, select qualified Optimum Support structure, correspondingly can by technical indicator, economic indicator with
The overall performane of construction technology index index as type selecting standard；
Supporting construction technical indicator and economic indices value
(note：A+b=1 and a and b are all higher than 0, refer to following table value, b1Can be constant, and b2~b5Also dependent on being actually subjected to
Asking suitably adjust)
Technical indicator and economic indicator reference value
(note：A and b can carry out suitably adjusting according to actual requirement)
Construction technology index reference value
(note：C=1+x/100, x (%) are raising degree, can carry out value according to Practical Project data)
Conventional supporting construction technical indicator and economic sub-indicator score value
(10 points of full marks, minimum 4 points, its mid-score is higher：1. intensity is higher, controls the more good 2. man-machine, material of deformability
The smaller 3. site requirements of cost is strict, and 4. technical difficulty is smaller 5. needs duration more short more convenient, main structure construction of 6. constructing
Space is bigger)
Composite support primary and secondary supporting construction influences coefficient
(note：Soil body product=the λ of the soil body volume of main supporting construction influence/time supporting construction influence, then S1It is=λ/(1+
λ), S2It is=1/ (1+ λ),
General S during non-avaible1Desirable 0.5~0.8, S2Desirable 0.2~0.5, and S1+S2=1)
Composite support type selecting composite score calculating formula (fraction higher represent advantage more obvious)：
Wherein：F --- composite score：N --- the species of main supporting construction；M --- the species of secondary supporting construction；
S1--- main supporting construction influences coefficient；S2--- secondary supporting construction influences coefficient；
cn, cm--- the construction technology index of supporting construction n and supporting construction m；
A, b --- foundation ditch technical indicator and economic indicator, determine according to deep pit monitor grade；
KI, n, KJ, m--- the K of supporting construction niThe K of score value and supporting construction mjScore value；
bI-1, n, bI-1, m--- each economic sub-indicators of supporting construction n and each economic sub-indicators of supporting construction m.
Secondly, the intensity comprehensive selection of structure model selection：
Including：
(1) balance of horizontal direction power
When the calculating of each supporting construction is carried out, the effect of other supporting construction can be equivalent to load form and act on this
In supporting construction, and acting on the power in each supporting construction will balance, and if in foundation pit supporting construction consider level of advocating
Direction force, so each overall power in the horizontal direction of single supporting construction will be balanced in composite supporting construction, then：
Can also write：
Wherein：PI, n--- act on the upper i-th horizontal direction power of supporting construction n；
PR, n--- act on the vector of horizontal direction counter-force on supporting construction n：
PP, n--- act on the vector of other the horizontal direction external force removed on supporting construction n outside counter-force；
(2) bending resistance and shearing resistance is checked
Indivedual supporting construction (such as support pile or Diaphragm Wall Support Structure) are except the balance of checking computations horizontal direction power
It is outer also to need to carry out section bending resistance checking computations and shearing resistance checking computations.
Bending resistance is checked：
ΔMn=min { MR, nm-MP, nm}≥0
MR, nm=λ ∑s Wnm
Wherein：ΔMn--- supporting construction n points of minimum moment of flexure difference when calculating；
MR, nm--- bending resistance torque design loads of the supporting construction n at the m of section；
Wnm--- resistance moment standard values of the supporting construction n at the m of section
MP, nm--- act on the torque design load of all external force pair cross-section m on supporting construction n；
Monm--- act on the torque standard value of all external force pair cross-section m on supporting construction n；
λ, η --- design margin evaluation and important coefficient；
Pni--- act on the external force on supporting construction n；Lni--- act on external force pair cross-section m's on supporting construction n
The arm of force；
Shearing resistance is checked：
ΔTn=min { TR, nm-TP, nm}≥0
TR, nm=λ τnmAnm
Wherein：ΔTn--- supporting construction n points of minimum shearing difference when calculating；
TR, nm--- supporting construction n tangential shear Design values at the m of section；
TP, nm--- supporting construction n tangential shearing force design values at the m of section；
λ, η --- design margin evaluation and important coefficient；
τN, m--- design margin evaluation and important coefficient；Anm--- areas of the supporting construction n at the m of section；
Ti--- act on the shearing at the m of section.
Again, the stable Sexual behavior mode of structure model selection：
Need to carry out that stability is worthwhile after excavation of foundation pit, be now considered as the contact each other of some support structure, fill
Divide the influence considered between them, the stability after influence of the supporting construction to another supporting construction is calculated respectively, now count
Calculation process：A point calculation should be first carried out to respective stability, point calculation is by the size point for acting on the soil body in each supporting construction
It is main structure and secondary structure, main structure control global stability, secondary structure control a small range stabilization is now contemplated that mutually
Between deformation with coordinate, now equivalent to worthwhile；
(1) stability against sliding is worthwhile：
Potential water use is calculated using Sweden's circular arc Swedish method：
∑MAntiskid i=M1+M2+M3+......+Mi∑MAntiskid j=M '1+M′2+M′3+......+M′j
Wherein：Mi--- i-th group of drag (structure reactance and the native counter-force in foundation ditch inner side) is to the resisting moment at sliding surface center；
M′j--- jth group external force (active force of Basolateral soil) is to the slip moment at whole slide face center；
K1--- the minimum factor of safety against sliding of specification regulation.
(2) stability against overturning is worthwhile：
∑MThe anti-i that inclines=M1+M2+M3+......+Mi∑MTopple j=M '1+M′2+M′3+......+M′j
Wherein：Mi--- i-th group of drag (structure reactance and the native counter-force in foundation ditch inner side) is to the resistance to tipping moment of pivot；
M′j--- i-th group of external force (active force of Basolateral soil) is to the tilting moment of pivot；
K2--- the minimum Resistant heave safety coefficient of specification regulation.
(3) substrate resistance to chloride ion is worthwhile
Basement high stability is pull-type by normal anchor or brace type supporting construction is checked by code requirement, cantilever knot
Structure need not be checked.
Then：Earthquake response control deformation：As shown in Figure 8,9；
Become by being divided into the contribution that overall deformation is controlled in main structure and secondary structure, secondary structure control subrange
The effect of other supporting construction is equivalent to power and acts on this supporting by shape, deformation in main structure control entire scope in calculating process
In structure；
δnmi=(∑ Fnmi+∑FP, nmi)/Knmi≤δs
δnmi--- deformations of the main or secondary supporting construction n in m sections i directions；
Fnmi--- main or secondary supporting construction n is subject to the vector of the power of other supporting construction in m sections i directions；
FP, nmi--- the external force vector that main or secondary supporting construction n is subject in m sections i directions；
Knmi--- rigidity of the main or secondary supporting construction n in m sections i directions；δn--- value is agreed in malformation in specification.
sjk--- m cross-sectional distances are the vertical deformation of (j, k) place soil body in supporting construction n；
μjk--- m cross-sectional distances are the Poisson's ratio of (j, k) place soil body in supporting construction n；
--- from m cross-sectional distances be (j, k) place soil body in two correction factors of coordinate direction.
Finally：The contour connection selection of composite support：
Classification and deformation according to composite support are calculated it is recognised that the relation of each supporting construction is very close, multiple
The presence for closing supporting construction changes the force-mechanism of original single supporting construction, and corresponding Latent destruction position can also occur partially
Move, to consider the border contact between them, the influence of adjacent supporting construction is represented using influence coefficient.
A kind of compound system of deep foundation pit support, as shown in figs. 1-7, structure type includes series connection supporting 1.
Structure type also includes supporting 2 in parallel.
Structure type also includes connection in series-parallel supporting 3.
The series connection supporting 1 includes stepwise soil nailing wall structure；Stepwise piled anchor structure；Soil nail wall staking anchor structure.
The supporting in parallel 2 adds inner supporting structure including piled anchor；Double-row pile adds anchor structure；Dark post and beam soil nail wall.
The connection in series-parallel supporting 3 adds inner supporting structure including soil nail wall staking anchor.
Above-mentioned implementation method is the preferred embodiments of the present invention, is not for limiting implementation of the invention and right model
Enclose, equivalence changes and modification that all contents according to described in the present patent application scope of patent protection are made all should be included in this
In patent application the scope of the claims.
Claims (1)
1. a kind of method of the structure model selection of compound deep foundation pit support, it is characterised in that
First, design is considered：
During design composite support system, consider the structure type of periphery existing building, base form and buried depth and foundation ditch away from
From comprehensive to prop in terms of technology, economy and construction technology three after the form and buried depth of pipeline and the distance of foundation ditch
System carries out type selecting, qualified Optimum Support structure is selected, correspondingly by technical indicator, economic indicator and construction technology index
With reference to overall performane as type selecting standard；
Secondly, the intensity comprehensive selection of structure model selection：
Including：
(1) balance of horizontal direction power：When the calculating of each supporting construction is carried out, the effect of other supporting construction can be equivalent to
Load form is acted in the supporting construction, and acting on the power in each supporting construction will balance, and is examined in foundation pit supporting construction
The power of worry is mainly horizontally oriented power, so each overall power in the horizontal direction of single supporting construction will put down in composite supporting construction
Weighing apparatus；
(2) bending resistance and shearing resistance is checked：Indivedual supporting construction also need to carry out section bending resistance except checking the balance external of horizontal direction power
Checking computations and shearing resistance checking computations；
Again, the stable Sexual behavior mode of structure model selection：
Carry out that stability is worthwhile after excavation of foundation pit, now consider the contact each other of some support structure, take into full account it
Between influence, the stability after influence of the supporting construction to another supporting construction is calculated respectively, now calculating process：First
A point calculation is carried out to respective stability, a point calculation is divided into main structure with secondary knot by the size for acting on the soil body in each supporting construction
Structure, main structure control global stability, secondary structure control a small range stabilization is now contemplated that deformation each other and association
Adjust, now equivalent to worthwhile；
(1) stability against sliding is worthwhile：
Potential water use is calculated using Sweden's circular arc Swedish method：
∑MAntiskid i=M1+M2+M3+......+Mi ∑MAntiskid j=M '1+M′2+M′3+......+M′j
Wherein：Mi--- resisting moment of i-th group of drag to sliding surface center；
M′j--- slip moment of the jth group external force to whole slide face center；
K1--- the minimum factor of safety against sliding of specification regulation；
(2) stability against overturning is worthwhile：
∑MThe anti-i that inclines=M1+M2+M3+......+Mi ∑MTopple j=M '1+M′2+M′3+......+M′j
Wherein：MiResistance to tipping moment of-the i-th group of drag to pivot；
M′j--- tilting moment of the jth group external force to pivot；
K2--- the minimum Resistant heave safety coefficient of specification regulation；
(3) substrate resistance to chloride ion is worthwhile
Basement high stability is pull-type by normal anchor or brace type supporting construction is checked by code requirement, and cantilever design is not
Needs are checked；
Then：Control the method choice of deformation：
Supporting construction is decomposed into main structure and secondary structure, secondary structure control part model by the contribution controlled overall deformation
Interior deformation is enclosed, is deformed in main structure control entire scope, by other supporting construction in calculating process, including main structure or other times
The influence of structure is equivalent to power and acts in this supporting construction；
Finally：The contour connection selection of composite support：
Classification and deformation according to composite support are calculated it is recognised that the relation of each supporting construction is very close, composite support
The presence of protection structure changes the force-mechanism of original single supporting construction, and corresponding Latent destruction position can also shift,
Consider the border contact between them, the influence of adjacent supporting construction is represented using influence coefficient.
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| CN105804088B (en) * | 2015-12-17 | 2017-09-05 | 上海建工一建集团有限公司 | The construction method that wall and temporary support are removed by stages in deep basal pit stage construction |
| CN106088118A (en) * | 2016-08-19 | 2016-11-09 | 河海大学 | The method for designing of compound soil-baffling structure |
| CN110344418A (en) * | 2019-07-12 | 2019-10-18 | 江苏南通二建集团有限公司 | The structure and its construction technology of support system in a kind of deep basal pit |
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| US6984092B1 (en) * | 2004-06-30 | 2006-01-10 | John Henry Meyer | Corner connection for temporary shoring |
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