CN109371981A - Design method suitable for cyclotomy type combined foundation ditch support structure - Google Patents
Design method suitable for cyclotomy type combined foundation ditch support structure Download PDFInfo
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- CN109371981A CN109371981A CN201811449865.0A CN201811449865A CN109371981A CN 109371981 A CN109371981 A CN 109371981A CN 201811449865 A CN201811449865 A CN 201811449865A CN 109371981 A CN109371981 A CN 109371981A
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- cyclotomy
- foundation ditch
- ring beam
- type combined
- design method
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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
Abstract
The invention discloses a kind of design methods suitable for cyclotomy type combined foundation ditch support structure, stake diameter and spacing including determining fender post；Determine the insertion ratio of fender post；Determine the sectional dimension of ring beam；Determine the Equivalent Elasticity support coefficient K of ring beamh；Building enclosure horizontal displacement checking computations, ground settlement checking computations, overall stability checking computations, resistance to chloride ion checking computations are completed using Venus foundation pit software for calculation；The moment of flexure and shearing envelope diagram of building enclosure are determined using Venus foundation pit software for calculation；Space enclosing structure material and arrangement of reinforcement are determined according to the moment of flexure of building enclosure and shearing envelope diagram.Using a kind of Equivalent Elasticity support coefficient calculation method suitable for cyclotomy type ring beam provided by the invention, common foundation pit supporting construction can be converted by special-shaped foundation pit supporting construction and calculated, greatly reduce the design difficulty of such special-shaped foundation pit supporting construction.
Description
Technical field
The invention belongs to foundation pit enclosure structures to design calculating field, be related to a kind of suitable for cyclotomy type combined foundation ditch support knot
The design method of structure.
Background technique
Two-dimentional Vertical elastic foundation beam model is the commonly used theoretical calculation model of rectangle foundation pit Design of Retaining Structure,
Theoretical basis is mature, calculates feasibility height, and the foundation pit software for calculation based on the theoretical model is also widely used, such as opens
Star's foundation pit software for calculation etc..It can also be calculated with the theoretical model using the cylindrical foundation pit of Circle beam supporting system, it is crucial
Point is to calculate the equivalent stiffness of ring beam and retaining wall.
For the calculation method of the equivalent stiffness of cylindrical foundation pit ring beam, " port engineering continuous underground wall structure is designed and is applied
Work regulation " it has been given in (JTJ303-2003).But for cyclotomy type foundation pit supporting construction, it there is no the equivalent of unification at present
Calculating method of stiffness causes it not calculated using two-dimentional Vertical elastic foundation beam model directly.
Therefore, a kind of Equivalent Elasticity support coefficient calculation method suitable for cyclotomy type ring beam is needed at present.
Summary of the invention
The object of the invention is in order to overcome the shortcomings of the prior art, providing a kind of suitable for cyclotomy type combination base
The design method of pit supporting construction.
The purpose of the present invention can be achieved through the following technical solutions:
Cyclotomy type combined foundation ditch support structure includes fender post and supporter, and supporter is in cyclotomy type combined foundation ditch support knot
It is ring beam form inside structure, stull and diagonal brace, the vertical 3.0~5.0m of spacing of ring beam is set in two cyclotomy coupling parts.
When being designed to supporting construction,
First according to the design and calculation method of conventional foundation pit, primarily determine the stake diameter of foundation pit enclosure stake, spacing, insertion than with
And the sectional dimension of ring beam；
The Equivalent Elasticity support coefficient of ring beam is then determined according to following step:
It chooses half structure and acquires the ring beam internal force diagram under Uniform Load by Force Method Equation；
The softness factor expression formula of ring beam is obtained by integral calculation, and then obtains the Equivalent Elasticity support coefficient table of ring beam
Up to formula, the Equivalent Elasticity support coefficient of ring beam is acquired；
Then it using two-dimentional Vertical elastic foundation beam model, is enclosed in the input relevant parameter completion of Venus foundation pit software for calculation
Protection structure horizontal displacement checking computations, ground settlement checking computations, overall stability checking computations and resistance to chloride ion checking computations, checking computations pass through then defeated
Building enclosure envelope diagram of internal force out, and arrangement of reinforcement calculating is carried out accordingly.If checking computations do not pass through, change foundation pit enclosure stake stake diameter,
The above-mentioned calculating step of the parameters repetition such as sectional dimension of spacing, insertion ratio and ring beam.
Compared with prior art, the invention has the characteristics that:
(1) cyclotomy type combined foundation ditch support structure three-dimensional computational problem is reduced to two-dimensional plane problem to calculate, greatly
Cyclotomy type combined foundation ditch support structure design difficulty and calculation amount are reduced greatly.
(2) a kind of calculation method of Equivalent Elasticity support coefficient based on the support of Force Method Equation cyclotomy type ring beam is proposed,
Calculate theoretical mature, calculation method simplicity.
(3) Equivalent Elasticity support coefficient can be modified according to the diameter ratio of two cyclotomy, applied widely.
Detailed description of the invention
Fig. 1 is single cyclotomy type foundation pit supporting construction plan view.
Fig. 2 is to wait big double cyclotomy type combined foundation ditch support structural plans figures.
Big double cyclotomy type combined foundation ditch support structural perspectives such as Fig. 3 is.
Fig. 4 is not wait big double cyclotomy type combined foundation ditch support structural plans figures.
Fig. 5 is the flow diagram of the design method suitable for cyclotomy type combined foundation ditch support structure；
Fig. 6 is the half structure and basic structure schematic diagram for calculating Equivalent Elasticity support coefficient.
Fig. 7 is to be detached from body schematic diagram for calculating the calculating of Equivalent Elasticity support coefficient.
Description of symbols
Cyclotomy type combined foundation ditch support structure 1, fender post 10, supporter 20, stull 21, diagonal brace 22.
Specific embodiment
Technical solution provided by the invention is described further below in conjunction with specific embodiment and its attached drawing.In conjunction under
Face explanation, advantages and features of the invention will be apparent from.
As shown in Figures 1 to 4, cyclotomy type foundation pit supporting construction may include single cyclotomy type foundation pit supporting construction and cyclotomy type
Combined foundation ditch support structure；Wherein, cyclotomy type combined foundation ditch support structure may include equal big double cyclotomy type combined foundation ditch branch again
Protection structure and etc. not big double cyclotomy type combined foundation ditch support structures.
Further, cyclotomy type combined foundation ditch support structure 1 includes fender post 10 and supporter 20, and supporter 20 is in cyclotomy type
It is ring beam form inside combined foundation ditch support structure 1, stull 21 and diagonal brace 22 is set in two cyclotomy coupling parts.
In the present invention, vertical 3.0~5.0m of spacing of ring beam (i.e. supporter).
In the present invention, the fender post is cast-in-situ bored pile, and can be selected according to the level of ground water situation of construction site
Apply or do not apply water-stop curtain.
In the present invention, bottom of foundation ditch carries out back cover using cast-in-place concrete, and can select dry back cover according to site condition
Or underwater back cover.
As shown in figure 5, the design method proposed by the present invention suitable for cyclotomy type combined foundation ditch support structure, including it is as follows
Process:
(1) stake diameter, spacing and the insertion ratio of foundation pit enclosure stake are determined, and determines the sectional dimension (b × h) of ring beam；
Firstly, determine foundation pit geometry and size according to requirements, and according to the design and calculation method of conventional foundation pit,
Primarily determine stake diameter, the spacing, the sectional dimension of insertion ratio and ring beam of foundation pit enclosure stake.
(2) the Equivalent Elasticity support coefficient K of ring beam is determinedh；
(2.1) it chooses half structure and acquires the ring beam internal force diagram under Uniform Load by Force Method Equation；
The unknown counter-force in statically indeterminate structure is acquired by following Force Method Equations (1), and acquires the ring of structure by formula (2)
Beam internal force diagram；
Wherein,
X1、X2: Force Method Equation fundamental unknown variables；
δij: basic structure is in unit force XjAlong X under=1 independent roleiDisplacement (the i=1,2 in direction；J=1,2)；
ΔiP: basic structure is under external load independent role along XiThe displacement (i=1,2) in direction；
It is basic structure respectively in unit force XiMoment of flexure, shearing, axle power point under=1 independent role
Cloth (i=1,2)；
M(α)q、Q(α)q、N(α)qIt is that moment of flexure, shearing, axle power of the basic structure under external load independent role are distributed respectively；
M (α), Q (α), N (α) are that moment of flexure, shearing, axle power of the former half structure under external load independent role are distributed respectively；
(2.2) the softness factor expression formula of ring beam is calculated by integral formula (3), and then obtains the equivalent bullet of ring beam
Property support coefficient expression formula；
It is acquired by following integral formulas (3) in α0Place acts on the radial deformation δ that a unit force generates, then the equivalent bullet of ring beam
Property support coefficient Kh=1/ δ.
Wherein,
δ: former half structure is in α0Place acts on the radial deformation that a unit force generates；
Respectively basic structure is in α0Place acts on moment of flexure, the axle power, shearing point that a unit force obtains
Cloth；I: ring beam cross sectional moment of inertia can pass throughIt calculates, bh is the sectional dimension of ring beam；
E: modulus of elasticity of concrete；
G: concrete shearing modulus；
A: ring beam area of section；
R: Circle beam supporting system diameter；
K: the coefficient related with cross sectional shape quoted because shearing stress is uniform along cross-sectional distribution has k for rectangular section
=1.2；
(3) using two-dimentional Vertical elastic foundation beam model, inputted in Venus foundation pit software for calculation fender post stake diameter,
The Equivalent Elasticity support coefficient K for the ring beam being calculated in spacing, insertion ratio and step (2.2)h, it is horizontal to carry out building enclosure
Checking Displacement, ground settlement checking computations, overall stability checking computations, resistance to chloride ion checking computations, checking computations, which pass through, thens follow the steps (4),
Checking computations do not pass through the ginsengs such as the stake diameter of then return step (1) change foundation pit enclosure stake, spacing, the sectional dimension of insertion ratio and ring beam
It counts and repeats the above steps；
Checking computations can reduce fender post spacing by increasing stake diameter, insertion ratio not by illustrating supporting construction insufficient rigidity
Or one or more of sectional dimension for increasing ring beam is to improve rigidity.
(4) moment of flexure and shearing envelope diagram of building enclosure are determined using Venus foundation pit software for calculation；
(5) space enclosing structure material and arrangement of reinforcement are determined according to the moment of flexure of building enclosure and shearing envelope diagram.
The present invention mainly calculates support equivalent stiffness, Internal force of support structure, after calculating Internal force of support structure, arrangement of reinforcement meter
It calculates identical as ordinary construction.
Further, step (2) KhCalculated value be only applicable to the identical situation of two cyclotomy type diameters, when two cyclotomy types
It, need to be to K when diameter differencehIt is modified, correction value Kh'=mKh, m carries out value as follows:
When another ratio r cut diameter of a circle and calculate cyclotomy diameter=3, m takes 0.6, when 1 < r < 3, by linear interpolation
Carry out value；As r=0.3, m takes 1.6, when 0.3 < r < 1, carries out value by linear interpolation.
The Equivalent Elasticity support coefficient K of ring beam described in 6 pairs of steps (2) with reference to the accompanying drawinghCalculation method make into one
Walk explanation.
As shown in Figure 6 and Figure 7, the half structure for calculating Equivalent Elasticity support coefficient is secondary statically indeterminate structure, is selected
X1、X2For two unknown counter-forces of basic structure, X1、X2It can be obtained by solve system of equation (1).
Wherein, coefficient δ11、δ12、δ21、δ22、Δ1P、Δ2PIt can be acquired by formula (4) (5).
Wherein,
Q: the evenly load value on ring beam is acted on；
θ: the central angle size of the non-circular arc segment section of half structure；
L: the non-arc section length of half structure；
Acquire X1、X2Afterwards, structural internal force M (α), N (α), Q (α) can be acquired according to formula (2), in which:
Finally, being acquired according to formula (3) in α0Place acts on the radial deformation δ that a unit force generates, then Kh=1/ δ.
It, need to be to K for not equal big double cyclotomy type combined foundation ditchhIt is modified, Kh'=mKh, m taken as follows
Value:
d2/d1When=1, m=1.0, d2/d1When=3, m=0.6,1 < d2/d1When < 3, value is carried out by linear interpolation；d2/d1
When=0.3, m=1.6,0.3 < d2/d1When < 1.0, value is carried out by linear interpolation.
Foregoing description is only the description to present pre-ferred embodiments, is not any restriction to the scope of the invention.Appoint
Any change or modification what those skilled in the art makes according to the technology contents of the disclosure above should all regard
For equivalent effective embodiment, the range of technical solution of the present invention protection is belonged to.
Claims (9)
1. a kind of design method suitable for cyclotomy type combined foundation ditch support structure, it is characterised in that: the cyclotomy type combines base
Pit supporting construction includes fender post and supporter, and the supporter is ring beam shape in cyclotomy type combined foundation ditch support inside configuration
Stull and diagonal brace is arranged in two cyclotomy coupling parts in formula, the supporter；
The design method includes at least following procedure:
(1) stake diameter, spacing and the insertion ratio of foundation pit enclosure stake are determined, and determines the sectional dimension of ring beam；
(2) the Equivalent Elasticity support coefficient K of ring beam is determinedh；
(3) building enclosure horizontal displacement checking computations, ground settlement checking computations, overall stability are completed using Venus foundation pit software for calculation
Checking computations, resistance to chloride ion checking computations；
(4) moment of flexure and shearing envelope diagram of building enclosure are determined using Venus foundation pit software for calculation；
(5) space enclosing structure material and arrangement of reinforcement are determined according to the moment of flexure of building enclosure and shearing envelope diagram.
2. a kind of design method suitable for cyclotomy type combined foundation ditch support structure according to claim 1, feature exist
In: the fender post is cast-in-situ bored pile, and can select to apply or do not apply sealing according to the level of ground water situation of construction site
Curtain.
3. a kind of design method suitable for cyclotomy type combined foundation ditch support structure according to claim 1, feature exist
In: the vertical spacing of the supporter is 3.0~5.0m.
4. a kind of design method suitable for cyclotomy type combined foundation ditch support structure according to claim 1, feature exist
In: bottom of foundation ditch carries out back cover using cast-in-place concrete, and can select dry back cover or underwater back cover according to site condition.
5. a kind of design method suitable for cyclotomy type combined foundation ditch support structure according to claim 1, feature exist
In: the Equivalent Elasticity support coefficient K of step (2) described ring beamhCalculating steps are as follows:
(2.1) it chooses half structure and acquires the ring beam internal force diagram under Uniform Load by Force Method Equation；
(2.2) the softness factor expression formula of ring beam is obtained by integral calculation, and then obtains the Equivalent Elasticity support coefficient of ring beam
Expression formula.
6. a kind of design method suitable for cyclotomy type combined foundation ditch support structure according to claim 5, feature exist
In: in step (2.1) the unknown counter-force in statically indeterminate structure is acquired by following Force Method Equations (1), and acquired by formula (2)
Structural internal force figure；
Wherein,
X1、X2: Force Method Equation fundamental unknown variables；
δij: basic structure is in unit force XjAlong X under=1 independent roleiDisplacement (the i=1,2 in direction；J=1,2)；
ΔiP: basic structure is under external load independent role along XiThe displacement (i=1,2) in direction；
It is basic structure respectively in unit force XiMoment of flexure under=1 independent role,
Shearing, axle power distribution (i=1,2)；
M(α)q、Q(α)q、N(α)qIt is moment of flexure of the basic structure under external load independent role respectively, cuts
Power, axle power distribution；
M (α), Q (α), N (α) be respectively moment of flexure of the former half structure under external load independent role, shearing,
Axle power distribution.
7. a kind of design method suitable for cyclotomy type combined foundation ditch support structure according to claim 6, feature exist
In: coefficient δ11、δ12、δ21、δ22、Δ1P、Δ2PIt is acquired by following formula (4) (5)；
Wherein,
Q: the evenly load value on ring beam is acted on；
θ: the central angle size of the non-circular arc segment section of half structure；
L: the non-arc section length of half structure.
8. a kind of design method suitable for cyclotomy type combined foundation ditch support structure according to claim 7, feature exist
In: in step (2.2), acquired by following integral formulas (3) in α0Place acts on the radial deformation δ that a unit force generates, then ring
The Equivalent Elasticity support coefficient K of beamh=1/ δ.
9. a kind of design method suitable for cyclotomy type combined foundation ditch support structure according to any one of claims 1 to 8,
It is characterized in that: the KhCalculated value be only applicable to the identical situation of two cyclotomy type diameters need to be to K when the two diameter differenceh
It is modified, correction value Kh'=mKh, m carries out value as follows:
When another ratio r cut diameter of a circle and calculate cyclotomy diameter=3, m takes 0.6, when 1 < r < 3, by linear interpolation progress
Value；As r=0.3, m takes 1.6, when 0.3 < r < 1, carries out value by linear interpolation.
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| CN201811449865.0A CN109371981A (en) | 2018-11-30 | 2018-11-30 | Design method suitable for cyclotomy type combined foundation ditch support structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114970016A (en) * | 2022-05-13 | 2022-08-30 | 安徽省城建设计研究总院股份有限公司 | Pi-shaped support inclined strut displacement calculation method, Pi-shaped support design method and support method |
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| JP2009197503A (en) * | 2008-02-22 | 2009-09-03 | Ksk:Kk | Support material for sheet pile |
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| JP2009197503A (en) * | 2008-02-22 | 2009-09-03 | Ksk:Kk | Support material for sheet pile |
| CN101615212A (en) * | 2009-07-28 | 2009-12-30 | 武汉理工大学 | A kind of campshed-Nei Zhi supporting system simplified design calculation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114970016A (en) * | 2022-05-13 | 2022-08-30 | 安徽省城建设计研究总院股份有限公司 | Pi-shaped support inclined strut displacement calculation method, Pi-shaped support design method and support method |
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