CN105069210B - Transmission line of electricity digging foundation seriation modular design figure and design method - Google Patents
Transmission line of electricity digging foundation seriation modular design figure and design method Download PDFInfo
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Abstract
The invention discloses a kind of transmission line of electricity digging foundation seriation modular design drawing and design method, the design method uses reverse design pattern, i.e. foundation load is unknown, cohesive soil ground condition is first divided into 6 grades, again assume that a series of digging foundation appearance and size of models, and calculate the anti-pulling capacity under various foundation conditions, then modular design figure is made, from when only need according to foundation condition, an anti-pulling capacity is found in the allusion quotation for meeting foundation condition sets basic model and is slightly larger than or sets basic model equal to the allusion quotation of basic uplift load.The invention provides the digging foundation modular design drawing of seriation, is directly selected in digging foundation design for designer, can improve design efficiency, shorten the design cycle, and be effectively improved the quality of drawing.
Description
Technical field
The present invention relates to the design method of transmission line of electricity digging foundation, more specifically, is just to provide the typical case of seriation
Design drawing, directly selected for designer in the design of transmission line of electricity digging foundation.
Background technology
Digging foundation has been widely applied in China's work transmission line, basic anti-pulling capacity generally according to
《Aerial power transmission line basic engineering technical stipulation》" shearing method " in DL/T5219-2005 calculates,【Note：State Grid's industry
New technical regulation is promulgated《Overhead transmission line basic engineering technical regulation》DL/T5219-2014】.
On to pull out basis be more special basis, be rarely employed in common engineering, therefore domestic that studies is made to such basis
People is seldom.The basis of self-supporting tower, which exists, in transmission line of electricity above pulls out basis, so only power industry is ground to such basis
Study carefully.
Fig. 1 is existing《Overhead transmission line basic engineering technical regulation》The theory on basis is pulled out in DL/T5219-2014
Computation model, it is assumed that shear breakage is circular curve, and basic anti-pulling capacity is made up of three parts：1st, concrete foundation from
Weight；2nd, sole plate top and the soil weight in the range of shear breakage；3rd, critical depth hcCutting on Duan Tuti shear breakages
Resistance, disregard bottom hbResistance is cut on Duan Tuti shear breakages.However, the defects of larger be present in this computation model, it is main
Will be by following 2 points：One is the horn mouth opening of top soil body shear breakage is too big, i.e. the radius r of circular curve has been got
It is small, cause shear breakage and soil body volume to increase, formula proving person will also recognize that on the soil body shear breakage of top in fact
Cut resistance and soil is reruned greatly, so ignoring bottom hbResistance is cut on Duan Tuti shear breakages；The second is failure test
Prove that the resistance of cutting of soil body shear breakage is concentrated mainly on lower section, and the computation model is then on the contrary, cause result of calculation not
Rationally.
When designing digging foundation, each designing institute is typically designed using line tower foundation special designs software（Such as Beijing
" road is prosperous "）, but the line tower foundation special-purpose software of existing in the market there are problems that in use, mainly Software Create
Reinforcement structure detail drawing expression it is unintelligible, do not follow structure drawing specification.Such as taken turns in drawing norm regulation structural reinforcement figure
Profile should be fine line, and reinforcing bar is heavy line, and the structure chart contour line of " road is prosperous " generation is heavy line, causes contour line and steel
Muscle is obscured, and reinforcing bar mark is also lack of standardization, is used for instructing without detailed detail design explanation and standard construction, it is also necessary to manually adds
It is affixed by work specification.The function of other software Automatic Optimal basis base expanding and base expanding size, its result is often unsatisfactory, sometimes
Even there is the very irrational result of substrate base expanding and base expanding size, the digging foundation of identical load and foundation condition is used by different designers
When road henry software is designed, material usage has larger difference.
The content of the invention
It is an object of the invention to provide a kind of new and safe and reliable design and calculation method and provide drawing for seriation
Basic modular design drawing is dug, is directly selected in digging foundation design for designer, design efficiency can be improved, shorten design week
Phase, and it is effectively improved the quality of drawing.
It is this to achieve the above object, it is necessary to work out the modular design figure (individual model about more than 2000) of conventional digging foundation
Need to conclude foundation condition and simplified, some Uniform provisions are made to the appearance and size of digging foundation.Described briefly below hair
Bright design method and step：
(1) common cohesive soil ground can be increased into 31 grades to 6 grades are divided into by force by poor by interpolation, its
In：
1* levels correspond to the soft plastic clay of C=20, φ=0；
2* levels correspond to the soft plastic clay of C=26, φ=3；
3* levels correspond to the plastic clay of C=32, φ=6；
4* levels correspond to the plastic clay of C=38, φ=9；
5* levels correspond to C=44, the hard plastic clay of φ=12, closely knit coarse sand, rubble；
6* levels correspond to C=50, the hard plastic clay of φ=15, closely knit gravel, closely knit gravelly soil；
C values step-length desirable 1,2,3 when needing interpolation；φ values correspond to step-length as 0.5,1,1.5；
(2) profile on basis is pressed into certain regular value, basic diameter takes 1.0,1.2,1.5,1.8 meters；Basis is buried depth
Degree is deepened since 2.0 meters by 0.5 meter of step-length；Base expanding and base expanding size k value 0.5,0.6,0.7,0.8 meter of the substrate per side；And to base
Bottom expands area of bed and calculating is optimized in advance；
(3) with opening and exhaling the ratio between height when all kinds of steel towers of statistical analysis design, tangent tower is b/h=1/8~1/6,
Anchor support is b/h=1/5~1/4；According to opening and exhaling high ratio can determine the ratio of column foot cross force and uplift force, directly
Transmission tower is H/T=1/16~1/12, and anchor support is H/T=1/10~1/8；
(4) form factor on basis is set according to various foundation conditions and allusion quotation, is used《Building pile foundation technical specification》
Calculation formula in JGJ94-2008 in the computation model of base expanding and base expanding uplift pile and U.S.'s Structural Engineering handbook, counted with " shearing method "
Calculate the anti-pulling capacity that allusion quotation sets basis；
(5) anti-pulling capacity on basis is set according to allusion quotation, is set by cross force and the ratio calculation basis lateral load of uplift force
Evaluation, wherein：The lateral load of straight line tower foundation is designed by 0.1 times of anti-pulling capacity, 0 degree of corner of strain insulator and pendulous angle tower base
The lateral load of plinth is designed by 0.12 times of anti-pulling capacity, and the lateral load of angle tower and terminal tower foundation is held by 0.15 times of resistance to plucking
Carry power design；Pressed again by the anti-pulling capacity and basic lateral load on basis《Overhead transmission line basic engineering technical regulation》
DL/T5219-2014 calculates the maximal bending moment and shearing of basic base body；
(6) press newly《Code for design of concrete structures》Circular section biases arrangement of reinforcement formula to base body in GB50010-2010
Arrangement of reinforcement is carried out, and is pressed《Overhead transmission line basic engineering technical regulation》Arrangement of reinforcement result is multiplied by 1.1 by DL/T5219-2014
Regulation coefficient.
The present invention changes traditional basic engineering pattern, and traditional infrastructure is designed as forward designing pattern, i.e., known to necessary elder generation
Column foot uplift load and lateral load, further according to foundation condition software or engineer basis, that is, without foundation load
Cannot design basis with foundation condition.And the present invention uses reverse design pattern, i.e. foundation load is unknown, first by sticky soil
Base condition is divided into 6 grades, again assumes that a series of digging foundation appearance and size of models, and calculates under various foundation conditions
Anti-pulling capacity, and modular design figure is made, only needs according to foundation condition during selection, base is set in the allusion quotation for meeting foundation condition
An anti-pulling capacity is found in plinth model to be slightly larger than or set basic model equal to the allusion quotation of basic uplift load.
Design method of the present invention has advantages below compared with traditional design method：
1st, the designer that digging foundation seriation modular design figure is enriched by design experiences works out, using new specification, establishment
Process is rigorous, and design drawing quality is high, allusion quotation set drawing quantity number can be adjusted according to being actually needed, increase allusion quotation sets figure
Paper is very convenient.
2nd, the use of the process change of special-purpose software design basis is that one is selected from seriation modular design figure by designer
Individual basic process, even if the not very familiar civil engineering structure design of designer, as long as its choosing is instructed to foundation condition, it is ensured that choosing
To relatively reasonable basis.
3rd, it is time saving and energy saving, design efficiency is high, helps speed up design schedule, shorten the design cycle.
4th, digging foundation profile seriation, appearance and size is regular, and convenient construction makes template and mechanized construction requirement.
Brief description of the drawings
Fig. 1 is existing《Overhead transmission line basic engineering technical regulation》The theory on basis is pulled out in DL/T5219-2014
Computation model；
Fig. 2 is that the resistance to plucking that the present invention uses calculates theoretical model.
Embodiment
For a better understanding of the present invention, below in conjunction with the accompanying drawings and the example content that the present invention is furture elucidated.
First, the resistance to plucking that the present invention uses calculates theoretical model Brief description：
Fig. 2 is the computation model that the present invention uses, and computation model mainly employs《Building pile foundation technical specification》
The computation model of base expanding and base expanding uplift pile, calculation formula then employ the U.S. in JGJ94-2008《Structural Engineering
Handbook》Calculation formula in the second edition in 1979.The anti-pulling capacity on basis is also made up of three parts：1st, concrete foundation
Deadweight；2nd, sole plate top and shear breakage hcSoil weight in segment limit, 3, critical depth hcOn Duan Tuti shear breakages
Cut resistance, and top hbThe collateral resistance on Duan Jishen surfaces.
Computation model of the present invention with it is existing《Overhead transmission line basic engineering technical regulation》DL/T5219-2014 meter
Calculating model difference is：The shear breakage of the soil body is taken in bottom, and shear breakage is a face of cylinder.This computation model and reality
Border experiment damage model is more close.It is close to the face of cylinder from soil mechanics theory also provable failure mechanics, is given for one
The digging foundation of appearance and size and foundation condition, it can be assumed that a plurality of different circular curve, i.e., different r values simultaneously progressively increase,
The corresponding foundation anti-pulling bearing capacity of each r values is calculated, anti-pulling capacity is reduced with r increase, when r values are very big
When, circular curve just close to straight line, so《Building pile foundation technical specification》With regard to the face of cylinder of cut-off line, actually this is one
The problem of minimizing, rather than arbitrarily assume one and be not inconsistent actual shear breakage.The computation model that the present invention uses will
Than《Current design criteria DL/T5219-2014》Computation model it is rationally superior more, calculation formula is comparatively simple, and after solving
Continue a series of calculating problem.
It is (no longer superfluous herein referring specifically to step (1)-(6) in the content of the invention according to design method of the present invention
State), the allusion quotation that can produce more than 2000 conventional model sets basis, is dispersed in 400 multiple drawings, and lookup is inconvenient, is this
Need to be compiled in an inquiry handbook, the allusion quotation that each model can be directly found in handbook is inquired about sets the resistance to plucking on basis
Bearing capacity, concrete amount and amount of reinforcement.
The practical function of inquiry handbook is exactly that have collected the characteristic that individual model allusion quotation more than 2000 sets basis, facilitates designer
Type selecting.Factor data is huge, and the allusion quotation that the present invention only provides part type number in inquiry handbook sets basis, as follows：
First, tangent tower basis look-up table
Note：Concrete density presses 24kN/m3Calculate；Unit sizes are m；Power is kN；Concrete is m3；Reinforcing bar is kg.
*-* Z draw digging allusion quotation and set foundation anti-pulling bearing capacity inquiry table：
2nd, 0 degree of strain insulator and pendulous angle tower basis look-up table
Note：Concrete density presses 24kN/m3Calculate；Unit sizes are m；Power is kN；Concrete is m3；Reinforcing bar is kg.
*-* X draw digging allusion quotation and set foundation anti-pulling bearing capacity inquiry table：
3rd, angle tower and terminal tower basis look-up table
Note：Concrete density presses 24kN/m3Calculate；Unit sizes are m；Power is kN；Concrete is m3；Reinforcing bar is kg.
*-* J draw digging allusion quotation and set foundation anti-pulling bearing capacity inquiry table：
And inquiry handbook is explained as follows：
1st, draw and dig the coding rule that allusion quotation sets basis：Numbering is with digging foundation (TW)+base body diameter (00)+embedded depth
(00)+basis goes out ground level (/ 00)+base expanding and base expanding size (/ 0)+foundation condition (- 0)+tower (Z, X, J i.e. tangent tower, strain insulator 0
Spend corner and three kinds of pendulous angle tower, angle tower and terminal tower towers), rear two digits and letter composition arrangement of reinforcement model.
Such as：TW1050/03/6-3J, refer to 1.0 meters of digging foundation diameter (10 decimeters), 5.0 meters of basic embedded depth
(50 decimeters), basis go out 0.3 meter of ground level, every side base expanding and base expanding k=0.6 meter in basis, correspondingly (3 grades) C=32, the original state of φ=6 are sticky
Soil base, corresponding steel tower are angle tower.By numbering above it can be seen that preceding 7 bit digital sets foundation outline size for allusion quotation, rear two
Bit digital and letter are foundation condition and tower, and it determines the size of basic arrangement of reinforcement, and institute can also be arrangement of reinforcement model for two later.
2nd, scope is worked out：
The embedded depth of 2.1 straight line tower foundations is 2.0~5.0 meters, a diameter of 1.0,1.2 meters of basis.
2.2 0 degree of strain insulators and the embedded depth for overhanging corner tower foundation are 4.0~6.5 meters, basis is a diameter of 1.0,1.2,
1.5 rice.
The embedded depth of 2.3 angle towers and terminal tower foundation is 4.5~9.0 meters, a diameter of 1.0,1.2,1.5 meters of basis.
3rd, the use of handbook is inquired about
3.1 first have to determine the foundation condition at actual column position, determine foundation soil grade (1-6), determine steel tower type
(Z, X, J), thus it is determined that allusion quotation sets the arrangement of reinforcement model on basis, remaining problem is to select the big of key dimension according to column foot load
It is small.
3.2 determine the uplift load design load and lateral load design load of column foot, are typically calculated and got by circuit software.
3.3 determine additional partial safety factor γ according to steel tower typef, by γfIt is multiplied by column foot uplift load design load TE, looking into
The arrangement of reinforcement model row that your needs are dig-inned in handbook is ask, makes γf TEValue is slightly smaller than or equal to some model basis in inquiry handbook
Anti-pulling capacity, then the basic model can be chosen to be the model of needs.It is each in theory to meet that design less than or equal to person
Ask, but preferably preferentially select diameter smaller, material can be saved.Base expanding and base expanding size is needed according to actual conditions and convenient construction
It is selected.
Allusion quotation in 3.4 inquiry handbooks sets the feelings that foundation anti-pulling bearing capacity does not account for underground water (buoyancy can be produced by referring to)
Condition, do not account for the influence of adjacent anti_floating foundation yet, when column foot root open size it is smaller when be considered as it and influence each other.When there is the above
Factor influence when, it is necessary to select figure tool software check and type selecting.
3.5, about whether the influence for needing to consider underground water, are constantly present some occluded waters in general soil, only soil layer is stagnant
Water is without the concern for its buoyancy effect, as long as not in river shoal location and being manually capable of the cohesive soil ground situation of normal borehole, ground
The influence of lower water can be disregarded.
3.6 have the basis ducked in drink some months, and the gravel that underground water is especially abundant in river shoal location, 1 year
May be in dry season when location, construction, or the concrete foundation poured under water, case above need to consider the shadow of underground water
Ring.
According to the application method of inquiry handbook, further illustrated with reference to following instance：
Type selecting is illustrated：(type selecting is more convenient using tool software)
Example 1
Tangent tower, column foot uplift load design load are：TE=320kN, lateral load Hx=30, Hy=3, foundation condition is
Soft plasticviscosity soil, characteristic value of foundation bearing capacity fk=80kpa.
Solution：It is 2 grades to determine foundation soil grade, arrangement of reinforcement model 2Z, tangent tower γf=1.1, γfTE=352, lateral load
H with joint effortsE=(302+ 32)1/2=30.2, cross force is less than 0.1 times of uplift force design load (0.1 × 320=32), and satisfaction is directly looked into
Handbook selects foundation drawing.
Selecting 1.0 meters of base body diameter, corresponding row 2Z selects TW1035/03/6-2Z types, T=353kN,
γfTE＜ T, meet to require.
Example 2
Angle tower is lifted the foot, and column foot uplift load design load is：TE=1200kN, lateral load Hx=120, Hy=80, ground
Condition is closely knit silty clay, characteristic value of foundation bearing capacity fk=200kpa.
Solution：It is 5 grades to determine foundation soil grade, arrangement of reinforcement model 5J, angle tower γf=1.6, γfTE=1920, horizontal lotus
Carry the H that makes a concerted effortE=(1202+ 802)1/2=144.2, cross force is less than 0.15 times of uplift force design load (0.15 × 1200=180),
Meet that table look-at selects foundation drawing.
1.0 meters of base body diameter is selected, corresponding row 5J, selects TW1065/03/7-5J types, T=2020kN.
γfTE＜ T, meet to require.
Example 3
0 degree of anchor support is lifted the foot, and column foot uplift load design load is：TE=846kN, lateral load Hx=10, Hy=80, ground
Base condition is plastic clay, characteristic value of foundation bearing capacity fk=150kpa.
Solution：It is 3.5 grades to determine foundation soil grade, and arrangement of reinforcement model selects 4X, angle tower γf=1.3, γf TE=1100, laterally
Load is made a concerted effort HE=(102+ 802)1/2=80.6, cross force is less than 0.12 times of uplift force design load (0.12 × 846=101.5),
Meet table look-at choosing figure.
Select 1.0 meters of base body diameter, corresponding row 4X, with the interpolated value between 3X~4X, select TW1055/03/7-3X with
TW1055/03/7-4X average value, T=(1007+1218)/2=1113kN,
γfTE＜ T, meet to require.Arrangement of reinforcement number selects top one grade, selectes TW1055/03/7-4X types.
Claims (2)
- A kind of 1. design method of transmission line of electricity digging foundation, it is characterised in that：This method uses reverse design pattern, i.e., basic Load is unknown, and cohesive soil ground condition first is divided into 6 grades, again assumes that a series of digging foundation appearance and size of models, and The anti-pulling capacity under various foundation conditions is calculated, is then made modular design figure, is only needed according to ground bar during selection Part, in the allusion quotation for meeting foundation condition sets basic model finding an anti-pulling capacity is slightly larger than or equal to basic uplift load Allusion quotation sets basic model；Its specific design step is：(1) common cohesive soil ground can be increased into 31 grades to 6 grades are divided into by force by poor by interpolation, wherein：1* levels correspond to C=20,Soft plastic clay；2* levels correspond to C=26,Soft plastic clay；3* levels correspond to C=32,Plastic clay；4* levels correspond to C=38,Plastic clay；5* levels correspond to C=44,Hard plastic clay, closely knit coarse sand, rubble；6* levels correspond to C=50,Hard plastic clay, closely knit gravel, closely knit gravelly soil；When needing interpolation, C values step-length value is 1,2,3；The corresponding step-length of value is 0.5,1,1.5；(2) profile on basis is pressed into certain regular value, basic diameter takes 1.0,1.2,1.5,1.8 meters；Basic embedded depth from 2.0 meters start, and deepen by 0.5 meter of step-length；Base expanding and base expanding size k value 0.5,0.6,0.7,0.8 meter of the substrate per side；And substrate is expanded Calculating is optimized in big area of bed in advance；(3) with opening and exhaling the ratio between height during the design of all kinds of steel towers of statistical analysis, tangent tower is b/h=1/8~1/6, strain insulator Tower is b/h=1/5~1/4；According to opening and exhaling high ratio can determine the ratio of column foot cross force and uplift force, tangent tower For H/T=1/16~1/12, anchor support is H/T=1/10~1/8；(4) form factor on basis is set according to various foundation conditions and allusion quotation, is used《Building pile foundation technical specification》JGJ94- Calculation formula in 2008 in the computation model of base expanding and base expanding uplift pile and U.S.'s Structural Engineering handbook, calculate allusion quotation with " shearing method " and set base The anti-pulling capacity of plinth；(5) anti-pulling capacity on basis is set according to allusion quotation, by the ratio calculation basis lateral load design load of cross force and uplift force, Pressed again by the anti-pulling capacity and basic lateral load on basis《Overhead transmission line basic engineering technical regulation》DL/T5219- 2014 calculate the maximal bending moment and shearing of basic base body；(6) press newly《Code for design of concrete structures》Circular section biases arrangement of reinforcement formula and base body is carried out in GB50010-2010 Arrangement of reinforcement, and press《Overhead transmission line basic engineering technical regulation》Arrangement of reinforcement result is multiplied by 1.1 adjustment by DL/T5219-2014 Coefficient.
- 2. design method according to claim 1, it is characterised in that：In the step (5), the horizontal lotus of straight line tower foundation Carry and designed by 0.1 times of anti-pulling capacity, the lateral load on 0 degree of corner of strain insulator and pendulous angle tower basis is carried by 0.12 times of resistance to plucking Power is designed, and the lateral load of angle tower and terminal tower foundation is designed by 0.15 times of anti-pulling capacity.
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| CN107476331B (en) * | 2017-09-01 | 2019-07-16 | 中国电力工程顾问集团中南电力设计院有限公司 | The design method on transmission line of electricity sheet-pile basis in cohesive soil |
| CN108038309B (en) * | 2017-12-12 | 2021-07-13 | 中国电建集团河北省电力勘测设计研究院有限公司 | Method for calculating standard value of uplift limit bearing capacity of bottom-expanded uplift short pile |
| CN109033547B (en) * | 2018-07-03 | 2023-04-07 | 三峡大学 | Depth calculation model for working area of bituminous pavement roadbed |
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| CN101718098A (en) * | 2009-11-09 | 2010-06-02 | 中国电力科学研究院 | Micro-pile combined dug composite foundation and construction method thereof |
| CN201984480U (en) * | 2010-12-15 | 2011-09-21 | 北京洛斯达电力工程有限公司 | Transmission line pole and tower design platform |
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| CN101718098A (en) * | 2009-11-09 | 2010-06-02 | 中国电力科学研究院 | Micro-pile combined dug composite foundation and construction method thereof |
| CN201984480U (en) * | 2010-12-15 | 2011-09-21 | 北京洛斯达电力工程有限公司 | Transmission line pole and tower design platform |
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