CN105069210A - Seriation typical design drawing and design method of power transmission line digging foundation - Google Patents
Seriation typical design drawing and design method of power transmission line digging foundation Download PDFInfo
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Abstract
The invention discloses a seriation typical design drawing and a design method of a power transmission line digging foundation. The design method adopts an inverse design mode, i.e. unknown foundation load, to firstly divide a clay soil foundation condition into six grades; then, digging foundation overall dimensions of a series of models are assumed, and pulling resistance bearing capacities under various foundation conditions are calculated; and the typical design drawing is made; and during selection, a typical design foundation model of which the pulling resistance bearing capacity is slightly greater than or equal to a foundation uplifting load needs to be found from the typical design foundation models which conform to the foundation conditions only according to the foundation conditions. The invention provides the seriation typical design drawing of the digging foundation for designers to directly select in a digging foundation design, design efficiency can be improved, a design period is shortened, and the quality of the drawing can be effectively improved.
Description
Technical field
The present invention relates to the method for designing of transmission line of electricity digging foundation, more particularly, be just to provide the modular design drawing of seriation, directly select for deviser in the design of transmission line of electricity digging foundation.
Background technology
Digging foundation is widely applied in China's work transmission line, the anti-pulling capacity on basis calculates according to " shearing method " in " aerial power transmission line basic engineering technical stipulation " DL/T5219-2005 usually, [note: State Grid's industry has promulgated new technical regulation " overhead transmission line basic engineering technical regulation " DL/T5219-2014].
On to pull out basis be more special basis, seldom use in common engineering, therefore domestic people doing to study to this type of basis is little.In transmission line of electricity, basis is pulled out on existing in the basis of self-supporting tower, so only power industry is studied this type of basis.
Fig. 1 be in existing " overhead transmission line basic engineering technical regulation " DL/T5219-2014 on pull out basis theoretical calculation model, assuming that shear breakage is circular curve, basis anti-pulling capacity be made up of three parts: 1, concrete foundation deadweight; 2, the soil weight within the scope of sole plate top and shear breakage; 3, critical depth h
cduan Tuti shear breakage cuts resistance, disregards bottom h
bduan Tuti shear breakage cuts resistance.But, there is larger defect in this computation model, primarily of following 2 points: the hydraucone of first top soil body shear breakage opens too large, namely the radius r of circular curve obtains too small, shear breakage and soil body volume is caused to increase, in fact formula proving person also know on the soil body shear breakage of top cut resistance and soil has been reruned greatly, so ignore bottom h
bduan Tuti shear breakage cuts resistance; It two is that failure test proves that the resistance of cutting of soil body shear breakage mainly concentrates on lower section, and this computation model is then contrary, causes result of calculation unreasonable.
When designing digging foundation, each designing institute generally adopts line tower foundation special designs software to carry out designing (as Beijing " road is prosperous "), but in use all there are some problems in the line tower foundation special software on existing market, mainly the reinforcement structure detail drawing of Software Create is expressed unintelligible, does not follow structure drawing specification.Such as, in drawing norm regulation structural reinforcement figure, outline line should be fine line, reinforcing bar is heavy line, and the structural drawing outline line that " road is prosperous " generates is heavy line, outline line and reinforcing bar is caused to be obscured, reinforcing bar mark is also lack of standardization, do not have detailed job design to illustrate and be used for instructing and standard construction, also need manually to add job design explanation.The function of end size is expanded on software Automatic Optimal basis in addition, its result often can not be satisfactory, sometimes even occur that the very irrational result of end size is expanded in substrate, when the digging foundation of identical load and foundation condition is designed by the prosperous software in different designs Zhe Yong road, material usage has larger difference.
Summary of the invention
The object of the present invention is to provide a kind of newly and safe and reliable design and calculation method the digging foundation modular design drawing of seriation is provided, directly select in digging foundation design for deviser, can design efficiency be improved, shorten the design cycle, and effectively improve the quality of drawing.
For achieving the above object, need the modular design figure (about more than 2000 model) of the conventional digging foundation of establishment, need to conclude foundation condition and simplify for this reason, some Uniform provisions are done to the physical dimension of digging foundation.Below sketch method for designing of the present invention and step:
(1) common cohesive soil ground being divided into by force 6 grades by differing from, 31 grades can being increased to by interpolation, wherein:
The soft plastic clay of 1* level corresponding C=20, φ=0;
The soft plastic clay of 2* level corresponding C=26, φ=3;
The plastic clay of 3* level corresponding C=32, φ=6;
The plastic clay of 4* level corresponding C=38, φ=9;
5* level corresponding C=44, φ=hard plastic clay of 12, closely knit coarse sand, rubble;
6* level corresponding C=50, φ=hard plastic clay of 15, closely knit gravel, closely knit gravelly soil;
The C value step-length desirable 1,2,3 when needs interpolation; The corresponding step-length of φ value is 0.5,1,1.5;
(2) profile on basis is pressed certain regular value, basic diameter gets 1.0,1.2,1.5,1.8 meters; Basis embedded depth, from 2.0 meters, is deepened by 0.5 meter of step-length; Size k value at the bottom of the expansion on the every limit of substrate 0.5,0.6,0.7,0.8 meter; And in advance calculating is optimized to substrate enlarged footing size;
(3) with opening and exhaling the ratio between height when all kinds of steel tower of statistical study designs, tangent tower is b/h=1/8 ~ 1/6, and anchor support is b/h=1/5 ~ 1/4; According to the ratio opened with exhale high ratio can determine column foot transverse force and uplift force, tangent tower is H/T=1/16 ~ 1/12, and anchor support is H/T=1/10 ~ 1/8;
(4) form factor on basis is established according to various foundation condition and allusion quotation, adopt the computing formula in the computation model and U.S.'s Structural Engineering handbook expanding end uplift pile in " building pile foundation technical manual " JGJ94-2008, calculate with " shearing method " anti-pulling capacity that allusion quotation establishes basis;
(5) anti-pulling capacity on basis is established according to allusion quotation, by the ratio calculation basis lateral load design load of transverse force and uplift force, wherein: the lateral load on tangent tower basis is by 0.1 times of anti-pulling capacity design, the lateral load on strain insulator 0 degree of corner and pendulous angle tower basis designs by 0.12 times of anti-pulling capacity, and the lateral load on angle tower and terminal tower basis is by 0.15 times of anti-pulling capacity design; Maximal bending moment and the shearing of basic base body is calculated by " overhead transmission line basic engineering technical regulation " DL/T5219-2014 again by the anti-pulling capacity on basis and basic lateral load;
(6) partially draw arrangement of reinforcement formula to carry out arrangement of reinforcement to base body by circular section in new " Code for design of concrete structures " GB50010-2010, and by " overhead transmission line basic engineering technical regulation " DL/T5219-2014, arrangement of reinforcement result is multiplied by the regulation coefficient of 1.1.
The present invention changes traditional basic engineering pattern, traditional infrastructure is designed to forward Design Mode, namely must first known column foot uplift load and lateral load, then according to foundation condition software or engineer basis, namely do not have foundation load and foundation condition just can not design basis.And the present invention adopts reverse design pattern, namely foundation load is unknown, first cohesive soil ground condition is divided into 6 grades, suppose the digging foundation physical dimension of a series of model again, and the anti-pulling capacity calculated under various foundation condition, and make modular design figure, only need according to foundation condition when selecting, establish in basic model the allusion quotation finding an anti-pulling capacity to be a bit larger tham or to equal basic uplift load to establish basic model in the allusion quotation meeting foundation condition.
Method for designing of the present invention, compared with traditional design method, has the following advantages:
1, digging foundation seriation modular design figure enriched by design experiences deviser establishment, adopt new criteria, compilation process is rigorous, and design drawing quality is high, allusion quotation establish drawing quantity number can adjust according to actual needs, increase allusion quotation establish drawing very convenient.
2, the process change of special software design basis deviser is used to be from seriation modular design figure, select a basic process, even if the not very familiar civil engineering structure design of deviser, as long as instruct its choosing to foundation condition, comparatively reasonably basis just can be ensured to choose.
3, time saving and energy saving, design efficiency is high, contribute to accelerate design schedule, shorten the design cycle.
4, digging foundation profile seriation, physical dimension is regular, and convenient construction makes template and mechanized construction requirement.
Accompanying drawing explanation
Fig. 1 be in existing " overhead transmission line basic engineering technical regulation " DL/T5219-2014 on pull out basis theoretical calculation model;
Fig. 2 is that the resistance to plucking that the present invention adopts calculates theoretical model.
Embodiment
In order to understand the present invention better, illustrate content of the present invention further below in conjunction with accompanying drawing and example.
First, the resistance to plucking that the present invention adopts calculates theoretical model Brief description:
Fig. 2 is the computation model that the present invention adopts, expand the computation model of end uplift pile in computation model mainly have employed " building pile foundation technical manual " JGJ94-2008, computing formula then have employed the computing formula in the U.S. " StructuralEngineeringHandbook " second edition in 1979.The anti-pulling capacity on basis is also made up of three parts: 1, concrete foundation deadweight; 2, sole plate top and shear breakage h
csoil weight in segment limit, 3, critical depth h
cduan Tuti shear breakage cuts resistance, and top h
bthe collateral resistance on segment base body surface.
The computation model difference of computation model of the present invention and existing " overhead transmission line basic engineering technical regulation " DL/T5219-2014 is: the shear breakage of the soil body is taken at bottom, and shear breakage is a face of cylinder.This computation model and actual tests damage model more close.From soil mechanics theory also provable failure mechanics close to the face of cylinder, for the digging foundation of a given physical dimension and foundation condition, many different circular curves can be supposed, namely different r value also progressively strengthens, calculate the foundation anti-pulling bearing capacity of the correspondence of each r value, anti-pulling capacity reduces along with the increase of r, when r value is very large, circular curve is just close to straight line, so " building pile foundation technical manual " is with regard to the face of cylinder of cut-off line, in fact this is the problem of a minimizing, instead of arbitrarily supposition one is not inconsistent actual shear breakage.The computation model that the present invention adopts is rationally superior more than the computation model of " current design criteria DL/T5219-2014 ", and computing formula is quite simple, and solves a follow-up a series of calculating difficult problem.
According to method for designing of the present invention (specifically see step (1)-(6) in summary of the invention, repeat no more) herein, the allusion quotation that can produce more than 2000 conventional model establishes basis, be dispersed in 400 multiple drawings, it is not too convenient to search, need to be compiled in an inquiry handbook, the allusion quotation directly can finding each model in inquiry handbook establishes anti-pulling capacity, concrete amount and the amount of reinforcement on basis for this reason.
The practical function of inquiry handbook is exactly have collected the characteristic that more than 2000 model allusion quotation establishes basis, facilitates deviser's type selecting.Factor data is huge, and the present invention only provides the allusion quotation of part type number in inquiry handbook to establish basis, as follows:
one, tangent tower basis look-up table
Note: concrete density presses 24kN/m
3calculate; Unit sizes is m; Power is kN; Concrete is m
3; Reinforcing bar is kg.
*-*
zdraw and dig allusion quotation and establish foundation anti-pulling bearing capacity question blank:
two, strain insulator 0 degree and pendulous angle tower basis look-up table
Note: concrete density presses 24kN/m
3calculate; Unit sizes is m; Power is kN; Concrete is m
3; Reinforcing bar is kg.
*-*
xdraw and dig allusion quotation and establish foundation anti-pulling bearing capacity question blank:
three, angle tower and terminal tower basis look-up table
Note: concrete density presses 24kN/m
3calculate; Unit sizes is m; Power is kN; Concrete is m
3; Reinforcing bar is kg.
*-*
jdraw and dig allusion quotation and establish foundation anti-pulling bearing capacity question blank:
And inquiry handbook is explained as follows:
1, draw and dig the coding rule that allusion quotation establishes basis: numbering goes out floor level (/ 00)+expansions end size (/ 0)+foundation condition (-0)+tower (Z, X, J and tangent tower, strain insulator 0 degree of corner and pendulous angle tower, angle tower and terminal tower three kinds of towers) with digging foundation (TW)+base body diameter (00)+embedded depth (00)+basis, and rear two digits and letter form arrangement of reinforcement model.
Such as: TW1050/03/6-3J, refer to digging foundation diameter 1.0 meters (10 decimeters), basic embedded depth 5.0 meters (50 decimeters), basis goes out floor level 0.3 meter, often k=0.6 rice, the undisturbed clay soil base of correspondence (3 grades) C=32, φ=6, corresponding steel tower at the bottom of the expansion of limit are angle tower on basis.Can find out that front 7 bit digital be allusion quotation establish foundation outline size by numbering above, rear two digits and letter are foundation condition and tower, which determine the size of basic arrangement of reinforcement, and after institute, two also can be arrangement of reinforcement model.
2, scope is worked out:
The embedded depth on 2.1 tangent tower bases is 2.0 ~ 5.0 meters, and basic diameter is 1.0,1.2 meters.
2.2 strain insulators 0 degree and the embedded depth overhanging angle tower basis are 4.0 ~ 6.5 meters, and basic diameter is 1.0,1.2,1.5 meters.
The embedded depth on 2.3 angle towers and terminal tower basis is 4.5 ~ 9.0 meters, and basic diameter is 1.0,1.2,1.5 meters.
3, the use of handbook is inquired about
3.1 foundation conditions first will determining actual column position place, determine foundation soil grade (1-6), determine steel tower type (Z, X, J), so just determine the arrangement of reinforcement model that allusion quotation establishes basis, remaining problem is the size selecting key dimension according to column foot load.
3.2 uplift load design load and the lateral load design loads determining column foot, are generally calculated by circuit software and get.
3.3 according to steel tower type determination line bonus term coefficient γ
f, by γ
fbe multiplied by column foot uplift load design load T
e, in inquiry handbook, dig-in the arrangement of reinforcement model row that you need, make γ
ft
evalue is slightly smaller than or equals to inquire about the anti-pulling capacity on certain model basis in handbook, then this basic model can be chosen to be the model of needs.Each person of being less than or equal to meets design requirement in theory, but should preferentially select diameter smaller, can save material.Expand end size to need to select according to actual conditions and convenient construction.
3.4 inquiry handbooks in allusion quotations establish foundation anti-pulling bearing capacity not consider to have the situation of underground water (referring to produce buoyancy), do not consider the impact of adjacent anti_floating foundation yet, when column foot root open size less time should consider that it influences each other.When there being above factor to affect, must check and type selecting with selecting figure tool software.
3.5 about the need of consideration underground water mitigation, always there are some retained waters in general soil, only soil layer backwater does not need to consider its buoyancy effect, only otherwise in location, river shoal and manually can the cohesive soil ground situation of normal borehole, and underground water mitigation can be disregarded.
3.6 in location, river shoal, the basis having some months to duck in drink in a year, and underground water enrich especially gravel location, construction time may in low water season, or the concrete foundation of building under water, above situation needs to consider underground water mitigation.
According to the using method of inquiry handbook, further illustrate in conjunction with following instance:
type selecting is illustrated: (type selecting employing tool software is more convenient)
example 1
Tangent tower, column foot uplift load design load is: T
e=320kN, lateral load H
x=30, H
y=3, foundation condition is soft plastic viscosity soil, characteristic value of foundation bearing capacity f
k=80kpa.
Separate: determine that foundation soil grade is 2 grades, arrangement of reinforcement model is 2Z, tangent tower γ
f=1.1, γ
ft
e=352, lateral load is made a concerted effort H
e=(30
2+ 3
2)
1/2=30.2, transverse force is less than 0.1 times of uplift force design load (0.1 × 320=32), meets and directly looks into handbook and select foundation drawing.
Select base body diameter 1.0 meters, corresponding row 2Z, select TW1035/03/6-2Z type, T=353kN,
γ
ft
e< T, meets the demands.
example 2
Angle tower is lifted the foot, and column foot uplift load design load is: T
e=1200kN, lateral load H
x=120, H
y=80, foundation condition is closely knit silty clay, characteristic value of foundation bearing capacity f
k=200kpa.
Separate: determine that foundation soil grade is 5 grades, arrangement of reinforcement model is 5J, angle tower γ
f=1.6, γ
ft
e=1920, lateral load is made a concerted effort H
e=(120
2+ 80
2)
1/2=144.2, transverse force is less than 0.15 times of uplift force design load (0.15 × 1200=180), meets table look-at and selects foundation drawing.
Select base body diameter 1.0 meters, corresponding row 5J, select TW1065/03/7-5J type, T=2020kN.
γ
ft
e< T, meets the demands.
example 3
0 degree of anchor support is lifted the foot, and column foot uplift load design load is: T
e=846kN, lateral load H
x=10, H
y=80, foundation condition is plastic clay, characteristic value of foundation bearing capacity f
k=150kpa.
Separate: determine that foundation soil grade is 3.5 grades, arrangement of reinforcement model selects 4X, angle tower γ
f=1.3, γ
ft
e=1100, lateral load is made a concerted effort H
e=(10
2+ 80
2)
1/2=80.6, transverse force is less than 0.12 times of uplift force design load (0.12 × 846=101.5), meets table look-at choosing figure.
Select base body diameter 1.0 meters, corresponding row 4X, by the interpolate value between 3X ~ 4X, select the mean value of TW1055/03/7-3X and TW1055/03/7-4X, T=(1007+1218)/2=1113kN,
γ
ft
e< T, meets the demands.Arrangement of reinforcement number selects top one grade, selected TW1055/03/7-4X type.
Claims (4)
1. the method for designing of a transmission line of electricity digging foundation, it is characterized in that: the method adopts reverse design pattern, namely foundation load is unknown, first cohesive soil ground condition is divided into 6 grades, suppose the digging foundation physical dimension of a series of model again, and the anti-pulling capacity calculated under various foundation condition, then modular design figure is made, only need according to foundation condition when selecting, establish in basic model the allusion quotation finding an anti-pulling capacity to be a bit larger tham or to equal basic uplift load to establish basic model in the allusion quotation meeting foundation condition.
2. method for designing according to claim 1, is characterized in that: specific design step is:
(1) common cohesive soil ground being divided into by force 6 grades by differing from, 31 grades can being increased to by interpolation, wherein:
The soft plastic clay of 1* level corresponding C=20, φ=0;
The soft plastic clay of 2* level corresponding C=26, φ=3;
The plastic clay of 3* level corresponding C=32, φ=6;
The plastic clay of 4* level corresponding C=38, φ=9;
5* level corresponding C=44, φ=hard plastic clay of 12, closely knit coarse sand, rubble;
6* level corresponding C=50, φ=hard plastic clay of 15, closely knit gravel, closely knit gravelly soil;
The C value step-length desirable 1,2,3 when needs interpolation; The corresponding step-length of φ value is 0.5,1,1.5;
(2) profile on basis is pressed certain regular value, basic diameter gets 1.0,1.2,1.5,1.8 meters; Basis embedded depth, from 2.0 meters, is deepened by 0.5 meter of step-length; Size k value at the bottom of the expansion on the every limit of substrate 0.5,0.6,0.7,0.8 meter; And in advance calculating is optimized to substrate enlarged footing size;
(3) with opening and exhaling the ratio between height when all kinds of steel tower of statistical study designs, tangent tower is b/h=1/8 ~ 1/6, and anchor support is b/h=1/5 ~ 1/4; According to the ratio opened with exhale high ratio can determine column foot transverse force and uplift force, tangent tower is H/T=1/16 ~ 1/12, and anchor support is H/T=1/10 ~ 1/8;
(4) form factor on basis is established according to various foundation condition and allusion quotation, adopt the computing formula in the computation model and U.S.'s Structural Engineering handbook expanding end uplift pile in " building pile foundation technical manual " JGJ94-2008, calculate with " shearing method " anti-pulling capacity that allusion quotation establishes basis;
(5) anti-pulling capacity on basis is established according to allusion quotation, by the ratio calculation basis lateral load design load of transverse force and uplift force, then calculate maximal bending moment and the shearing of basic base body by the anti-pulling capacity on basis and basic lateral load by " overhead transmission line basic engineering technical regulation " DL/T5219-2014;
(6) partially draw arrangement of reinforcement formula to carry out arrangement of reinforcement to base body by circular section in new " Code for design of concrete structures " GB50010-2010, and by " overhead transmission line basic engineering technical regulation " DL/T5219-2014, arrangement of reinforcement result is multiplied by the regulation coefficient of 1.1.
3. method for designing according to claim 2, it is characterized in that: in described step (5), the lateral load on tangent tower basis is by 0.1 times of anti-pulling capacity design, the lateral load on strain insulator 0 degree of corner and pendulous angle tower basis designs by 0.12 times of anti-pulling capacity, and the lateral load on angle tower and terminal tower basis is by 0.15 times of anti-pulling capacity design.
4. a transmission line of electricity digging foundation seriation modular design drawing, is characterized in that: according to any one of claim 1-3, method for designing is drawn and formed.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107476331A (en) * | 2017-09-01 | 2017-12-15 | 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 |
| CN108038309A (en) * | 2017-12-12 | 2018-05-15 | 中国电建集团河北省电力勘测设计研究院有限公司 | A kind of base expanding and base expanding resistance to plucking stub CAPO test Calculating Method of The Standard Values |
| CN109033547A (en) * | 2018-07-03 | 2018-12-18 | 三峡大学 | Bituminous pavement roadbed work area depth calculation model |
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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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107476331A (en) * | 2017-09-01 | 2017-12-15 | 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 |
| CN108038309A (en) * | 2017-12-12 | 2018-05-15 | 中国电建集团河北省电力勘测设计研究院有限公司 | A kind of base expanding and base expanding resistance to plucking stub CAPO test Calculating Method of The Standard Values |
| 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 |
| CN109033547A (en) * | 2018-07-03 | 2018-12-18 | 三峡大学 | Bituminous pavement roadbed work area depth calculation model |
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