CN102828525A - Foundation structure of power transmission line tower - Google Patents
Foundation structure of power transmission line tower Download PDFInfo
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- CN102828525A CN102828525A CN2012102926439A CN201210292643A CN102828525A CN 102828525 A CN102828525 A CN 102828525A CN 2012102926439 A CN2012102926439 A CN 2012102926439A CN 201210292643 A CN201210292643 A CN 201210292643A CN 102828525 A CN102828525 A CN 102828525A
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Abstract
The invention discloses a foundation structure of a power transmission line tower, and belongs to the field of foundations of extra-high-voltage and ultrahigh-voltage power transmission line towers. A dug foundation and a rock built-in foundation are integrally formed with a reinforcement mesh cage via foundation bolts, the dug foundation is positioned on a surface clay layer, and the rock built-in foundation is positioned in strong-weathered or medium-weathered rock formation. The dug foundation and the rock built-in foundation jointly resist acting force transmitted from the power transmission line tower, up-pull force is jointly born by relative soil shearing force formed in soil on a shearing surface by the dug foundation and bond force among rocks, downward pressure is born by a rock foundation on the lower side of rock built-in foundation, and horizontal force is jointly born by soil on side surfaces of a foundation main post and rocks on side surfaces of the rock built-in foundation. The foundation structure has the advantages that foundations of extra-high-voltage and ultrahigh-voltage transmission towers can be built under geological conditions that shallow layers are soil layers and deep layers are rock layers, and the foundations of the towers are environment-friendly according to the design, and are safe, economical and practical.
Description
Technical field
The present invention relates to the basic field of super-pressure, UHV transmission line iron tower, particularly a kind of foundation structure of electric power line pole tower.
Background technology
The under ground portion of overhead transmission line line pole tower totally is referred to as the basis, and pole and tower foundation is as the important component part of overhead transmission line, and its duration, cost and labor consumption account for very big proportion in whole line project.Add up according to interrelated data: in general overhead transmission line engineering construction; The basis duration accounts for the half the of whole duration of a project; The basis freight volume accounts for 60%, and expense accounts for 15～35% of body cost, and the shared ratio of foundation cost expense also can be higher in the extra-high voltage engineering.
Pole and tower foundation generally adopts undisturbed soil basis, relevant with present technique scheme digging foundation, Rock Bolt Foundation, the Rock Embed based etc. of mainly comprising.Wherein, digging foundation is directly in natural soil or rock, to draw to dig foundation ditch, in foundation ditch, inserts reinforcing bar, penetration concrete then and the basis that forms, is suitable for no phreatic hard plasticviscosity soil base.Rock Bolt Foundation is directly boring in rock, inserts anchor pole and grouting in holing and the basis of formation, is applicable to the hard rock ground of the good integrity that medium weathering is above.Rock Embed based is claimed wedge shape rock foundation again, and promptly suitable for reading less, the bottom is bigger, embeds in the hole of drawing out on the rock, and base plate is arrangement of reinforcement not, and foundation ditch is all drawn and dug, and is applicable to the more shallow or intectate highly weathered rock ground of covering layer.
Pole and tower foundation of the prior art mainly is made up of basic principal post, basic chassis, dowel, stone bolt, reinforcing cage etc.; Its dowel top is arranged on to draw to be dug in the foundation ditch, and with reinforcing cage and basic principal post and the concreting anchoring moulding of basic chassis, the dowel bottom directly insert surface drilling and grouting.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
Investigation shows that a lot of regional geology conditions mainly are that the face of land is covered by argillic horizon, and thickness is 2.5～4.0m, covers down to be severely-weathered or medium weathering rock stratum.For iron tower of power transmission line such as super-pressure, extra-high voltages; The basic role Z-TEK is not big; If adopt the pole and tower foundation of prior art on this regional electric power line pole tower basis,, do not make full use of the bearing capacity of basement rock because the dowel bottom is directly to insert in the surface drilling; If the rock stratum is very dark, the dowel bottom is difficult to just in time appear on the tower position of circuit, just is difficult to use; In addition, dowel top is arranged on to draw and digs in the foundation ditch, draws to dig for broken rock and soil and foundation ditch to be difficult to moulding and maybe can not to draw the tower position of digging and then can not use; Because draw and dig foundation ditch and expand and to dig limitedly, the base plate diameter should not be too big, uses in the tower position that engineering iron tower foundation active forces such as extra-high voltage are bigger, do not have tangible economic advantages.
Summary of the invention
Cover by argillic horizon on the face of land in order to solve prior art; Cover problem down for the geological conditions construction electric power line pole tower basis of severely-weathered or medium weathering rock stratum; The embodiment of the invention provides a kind of foundation structure of electric power line pole tower; Can make full use of the good engineering mechanics performance that top undisturbed soil characteristic and bottom rock shear strength are high, distortion is little, reduce construction costs, improve the compliance of basis the landform geomorphological environment.Said technical scheme is following:
A kind of foundation structure of electric power line pole tower; Comprise: digging foundation, Rock Embed based, stone bolt, rebar cylinder mould; Said digging foundation and Rock Embed based are through stone bolt and rebar cylinder mould build-in global formation; Wherein, digging foundation is positioned at the surface clay layer, and Rock Embed based is positioned at severely-weathered or the medium weathering rock stratum.
Particularly, said digging foundation is made up of basic principal post and basic chassis, wherein; The basis principal post is a cylinder, and basic chassis is a circular platform type, and the surface clay layer is exposed on said basic principal post top; The bottom connects basic chassis, and bottom, basic chassis connects the Rock Embed based of circular platform type.
Further, said basic chassis round platform bus be 30-55 ° along the angle a of Y axle vertical curve, the slope of bus is 0.577-1.42, the slope of said Rock Embed based round platform bus is 1/8～1/6.
Particularly, the top of said basic principal post is inserted with stone bolt, and said stone bolt is from top to bottom through digging foundation and Rock Embed based and rebar cylinder mould inside.
Further, the length of said stone bolt is greater than the height sum of digging foundation and Rock Embed based, and stone bolt top is provided with packing ring, locking nut and concrete enclosing cap, and the bottom is provided with crotch or is welded with anchor slab.
Particularly, said rebar cylinder mould is made up of some main muscle, several outer ring stirrups, several inner ring stirrups; Said each root master muscle vertically is provided with along the Y axle, and said each outer ring stirrup and each inner ring stirrup are along X axle horizontally set.
Further, said each root master muscle evenly distributes along circumference, and each outer ring stirrup is vertically arranged along the Y axle with each inner ring stirrup; Said each root master muscle evenly is arranged between each outer ring stirrup and each the inner ring stirrup, and said each outer ring stirrup and each inner ring stirrup be along each root master muscle vertical arrangement up and down, and is welded to each other with each root master muscle and reticulates cylinder.
Further, the height of said rebar cylinder mould is greater than the height of digging foundation, rebar cylinder mould from top to bottom in digging foundation and extend to Rock Embed based inner with digging foundation and Rock Embed based build-in.
The beneficial effect that the technical scheme that the embodiment of the invention provides is brought is:
The foundation structure that the embodiment of the invention adopts digging foundation and Rock Embed based to combine, top constitutes digging foundation by basic principal post and basic chassis, and base shape adopts shearing method to calculate, and the Rock Embed based shape of bottom adopts the rock Theoretical Calculation.Through digging foundation and Rock Embed based collaborative work; The active force that the built on stilts iron tower of power transmission line in common opposing top transmits; Wherein relative shearing of the soil body on the surface of shear that in the soil body, formed by digging foundation of uplift force and the adhesion stress between the rock are born jointly; Downforce is born by the rock face of Rock Embed based below, and horizontal force is born by the soil body of basic principal post side and the rock mass of Rock Embed based side jointly; Be implemented in shallow-layer and be soil layer, implement electric power line pole tower infrastructures such as super-pressure, extra-high voltage for the geological conditions of rock stratum slightly deeply, reach the purpose of basic engineering environmental protection, safety, economical rationality.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the front view of the foundation structure sketch map of the electric power line pole tower that provides of the embodiment of the invention;
Fig. 2 is an A-A sectional view among Fig. 1 of providing of the embodiment of the invention;
Fig. 3 is a B-B sectional view among Fig. 1 of providing of the embodiment of the invention;
Fig. 4 is the rebar cylinder mould structural representation of the foundation structure of the electric power line pole tower that provides of the embodiment of the invention;
The shearing method that Fig. 5 is the digging foundation that provides of the embodiment of the invention when ht≤hc calculates and pulls out stable sketch map;
The shearing method that Fig. 6 is the digging foundation that provides of the embodiment of the invention when ht＞hc calculates and pulls out stable sketch map;
Fig. 7 pulls out stable sketch map on the Rock Embed based shearing method that provides of the embodiment of the invention calculates.
Each symbolic representation implication is following among the figure: 1 digging foundation, 1-1 basis principal post, chassis, 1-2 basis, 2 Rock Embed based, 3 stone bolt, 3-1 crotch, 4 rebar cylinder moulds, 4-1 master's muscle, 4-2 outer ring stirrup, 4-3 inner ring stirrup, 5 concrete enclosing caps.
The specific embodiment
For making the object of the invention, technical scheme and advantage clearer, embodiment of the present invention is done to describe in detail further below in conjunction with accompanying drawing.
Shown in Figure 3 referring to Fig. 1, Fig. 2, the embodiment of the invention provides a kind of foundation structure of electric power line pole tower, and this foundation structure comprises at least: digging foundation 1, Rock Embed based 2, stone bolt 3, rebar cylinder mould 4, concrete protective cap 5 etc.; Covered by argillic horizon on the face of land, covering down is the foundation structure that the geological conditions of severely-weathered or medium weathering rock stratum adopts digging foundation 1 and Rock Embed based 2 to combine down, is implemented in this type area and implements electric power line pole towers bases such as super-pressure, extra-high voltage.
Particularly; As preferably; Said digging foundation 1 is integrated through stone bolt 3 and rebar cylinder mould 4 build-ins with Rock Embed based 2 with fixed attention, adopts the whole build-in moulding of concrete one-time-concreting, wherein; Digging foundation 1 is positioned at the surface clay layer, and Rock Embed based 2 is positioned at severely-weathered or the medium weathering rock stratum; Said digging foundation 1 is made up of basic principal post 1-1 and basic chassis 1-2; Wherein, Basis principal post 1-1 is a cylinder, and basic chassis 1-2 is a circular platform type, and the top of said basic principal post 1-1 is exposed the surface clay layer and covered; The bottom connects the basic chassis 1-2 of circular platform type, and the bottom of basic chassis 1-2 connects the Rock Embed based 2 of circular platform type.
Further, the height that said basic principal post 1-1 exposes the surface clay layer is generally more than the 200mm, and for the mountain area or the knob of hypsography, its value of exposing scope can be adjusted in the 200-1500mm scope; Said basic chassis 1-2 round platform bus be 30-55 ° along the angle a of Y axle vertical curve, the slope range of bus is 0.577-1.42, the slope range of Rock Embed based 2 round platform buses is 1/8～1/6; According to transmission line of electricity topography and geomorphology characteristic, the design height scope of said basic principal post 1-1 is 3000-5000mm, and the design height scope of basic chassis 1-2 is 1000-2500mm, and the design height scope of Rock Embed based 2 is 2500-4000mm.
Particularly, as preferably, the top of said basic principal post 1-1 is inserted with many stone bolt 3, is preferably four, and it is different and change that each root stone bolt 3 exposes the specification of value range base area foot bolt 3 of basic principal post 1-1, and its material scope is 200-400mm; Stone bolt 3 tops are provided with packing ring and locking nut, adopt concrete enclosing cap 5 of concreting moulding after assembling is accomplished, in order to protection stone bolt 3 and securing member; The length of said stone bolt 3 is greater than the height sum of digging foundation 1 with Rock Embed based 2; Stone bolt 3 is from top to bottom through digging foundation 1 and Rock Embed based 2 and rebar cylinder mould 4 inside; Stone bolt 3 bottoms are provided with crotch 3-1 or are welded with anchor slab, to strengthen anchoring effect.
Simultaneously referring to shown in Figure 4, particularly, as preferably, said rebar cylinder mould 4 is by some main muscle 4-1, and several outer rings stirrup 4-2 and several inner ring stirrups 4-3 constitute; Said each root master muscle 4-1 vertically is provided with along the Y axle, and said each outer ring stirrup 4-2 and each inner ring stirrup 4-3 are along X axle horizontally set; Some main muscle 4-1 evenly distribute along circumference, and several outer rings stirrup 4-2 and several inner ring stirrups 4-3 vertically arrange along the Y axle; Saidly evenly be arranged between each outer ring stirrup 4-2 and each the inner ring stirrup 4-3 along equally distributed each the root master muscle 4-1 of circumference; Said each outer ring stirrup 4-2 and each inner ring stirrup 4-3 are along each root master muscle 4-1 vertical arrangement up and down; At interval evenly; With each root master muscle 4-1 contact point be pad, and be welded to each other together, constitute the netted rebar cylinder mould of cylinder 4 thus; The height of said rebar cylinder mould 4 is greater than the height of digging foundation 1; Rebar cylinder mould 4 is from top to bottom in digging foundation 1 and extend to Rock Embed based 2 inside; Be mounted in digging foundation 1 and Rock Embed based 2 through concreting, the design height scope that insert in the Rock Embed based 2 said rebar cylinder mould 4 bottoms is 600-1300mm.
The operating principle of the embodiment of the invention: originally draw and dig adding rock Embed based body when receiving overhead transmission line line pole tower downforce; Downforce is pushed the capital of basic body through the column foot plate of shaft tower; Downforce is passed to the basic principal post 1-1 of the digging foundation 1 that is positioned at the surface clay layer; Basis principal post 1-1 passes to basic chassis 1-2 through concrete compression with downforce; Distortion through basic chassis 1-2 round platform compression foundation soil passes to foundation soil with the downforce of 30-40%; The basic body active force of remaining 60-70% passes to the Rock Embed based 2 that is positioned at severely-weathered or medium weathering rock stratum through basic principal post 1-1, downforce is diffused in the rock on every side of basis through Rock Embed based 2 compression rocks again.
The basis body is when bearing uplift force, and the adhesion stress on the surface of shear that in the soil body, is formed by digging foundation 1 between relative shearing of the soil body and the rock is born collaborative work, the active force that opposing top iron tower transmits jointly; At first elastic deformation takes place in the digging foundation 1 on top under the effect of uplift force; The elastic deformation of digging foundation 1 causes the relative deformation with soil layer around the basic body; Shearing force on the soil mass sliding surface that the edge of chassis, basis 1-2 round platform forms can be born the 35-50% of basic body uplift force, and all the other basic body uplift forces are born through the Rock Embed based 2 of bottom.Under the effect of uplift force, Rock Embed based 2 passes to rock to uplift force, through the shearing force between the rock contact uplift force is passed to the rock around the basic body.The basis body bears when pulling out load, and the angle of internal friction of undisturbed soil and cohesive force are able to play one's part to the full, and has reduced the eccentric bending moment that foundation level power produces.
When the basis body bears horizontal force, mainly bear jointly by the soil body of basic principal post 1-1 side and the rock mass of Rock Embed based 2 sides; At first produce horizontal drag to foundation soil through basic principal post 1-1 squeeze side; Along with the increase horizontal force of the basic body degree of depth is cancelled gradually; Bending moment produced by level force becomes 0 value at the inflection point place of basic principal post 1-1; Bending moment produced by level force produces eccentric downforce in the bottom of basic chassis 1-2 round platform, passes to foundation soil through basic chassis 1-2.
In order to reduce the lateral deformation on basis, can adopt following measure: 1. suitably increase the basic principal post 1-1 width of top digging foundation 1, improve the rigidity on basis; 2. suitably improve the height of basic chassis 1-2, reduce the inflection point of basic principal post 1-1 under horizontal force action, reduce basic lateral deformation; 3. the soil layer around not disturbance basis during foundation construction is guaranteed the integrality of undisturbed soil can guarantee that coefficient of subgrade reaction m value does not reduce, and reduces basic lateral deformation.
Below list embodiment of the invention design principle design formulas.
Relation formula between said top digging foundation 1, bottom Rock Embed based 2 and the basic body three is following:
T＝η
1.T
w+η
2.T
y （1）
In the formula:
T
w: the limit uplift force of top digging foundation 1,
T
y: pull out bearing capacity on the limit of bottom Rock Embed based 2,
T: the basic uplift force of base integral,
η
1: the adjustment coefficient of digging foundation limit uplift force,
η
2: the adjustment coefficient of Rock Embed based limit uplift force, two coefficients can be adjusted between 0.85-1.0 according to the difference of geological condition.
Referring to Fig. 5, shown in Figure 6, it is stable that the basic principal post 1-1 of said middle and upper part and basic chassis 1-2 adopt shearing method to calculate to pull out, and its design formulas is:
When ht≤hc:
When ht＞hc:
Wherein:
In the formula:
γ
f: the additional partial safety factor in basis;
T
E: basic uplift force design load;
γ
E: the horizontal force influence coefficient;
A
1: dimensionless coefficient;
Ht: the buried depth on basis;
A
2: dimensionless coefficient;
γ
s: the weighted average severe of the above soil of foundation bed;
D: circular bottom plate diameter;
Δ
v: the basic volume in the ht-hc scope;
Hc: pull out critical depth on the basis;
Qf: the basis is from gravity;
γ
θ: basic angle of spread influence coefficient;
c
w: calculate cohesive force;
C: according to saturated not Drainage Shear or be equivalent to the cohesive force that saturated not Drainage Shear method is confirmed;
S
r: the actual saturation ratio of foundation soil.
Referring to shown in Figure 7, on carrying out, the equivalent shearing method of Rock Embed based 2 employing rocks of said bottom pulls out stability calculation, and its design formulas is:
γ
fT
E≤πh
Oτ
s(D+h
O)+Q
f （5）
In the formula:
τ
s: the equivalent shear strength of rock;
H: basic overall height;
h
0: the basis is buried depth effectively;
D: the footpath, the end on basis;
Qf: the basis is from gravity.
In sum, the basic engineering that the embodiment of the invention proposes according to State Grid Corporation of China must adhere to protecting environment and the principle that economizes on resources, and covers at the surface clay layer and adopts digging foundation 1; Not disturbance undisturbed soil; Less to landform and vegetation deterioration, make full use of the undisturbed soil characteristic, pull out bearing capacity on the raising basis; Bear big vertical force of shaft tower and horizontal force, reduce the lateral deformation on basis; Under cover severely-weathered or Rock Embed based 2 is adopted in the medium weathering rock stratum, make full use of the shear strength of rock own, high-bearing capacity, the characteristic of low distortion makes originally to draw to dig and pulls out stablely on the adding rock build-in composite environmental-friendly basis, has stronger resistance to plucking supporting capacity.
In addition, through analyzing and verification experimental verification, when casting concrete, the embodiment of the invention do not need formwork; Concrete amount reduces by 10%～15%, and basic rolled steel dosage reduces by 30%～40%, and cubic metre of earth and stone output reduces by 30%～40%; The basis comprehensive cost descends 20%～30%, is economic environment-friendly type pole and tower foundation.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the foundation structure of an electric power line pole tower; It is characterized in that; Comprise: digging foundation (1), Rock Embed based (2), stone bolt (3), rebar cylinder mould (4), said digging foundation (1) passes through stone bolt (3) and rebar cylinder mould (4) build-in global formation with Rock Embed based (2), wherein; Digging foundation (1) is positioned at the surface clay layer, and Rock Embed based (2) is positioned at severely-weathered or the medium weathering rock stratum.
2. the foundation structure of electric power line pole tower according to claim 1 is characterized in that, said digging foundation (1) is made up of basic principal post (1-1) and basic chassis (1-2); Wherein, Basis principal post (1-1) is a cylinder, and basic chassis (1-2) is circular platform type, and the surface clay layer is exposed on said basic principal post (1-1) top; The bottom connects basic chassis (1-2), and bottom, basic chassis (1-2) connects the Rock Embed based (2) of circular platform type.
3. the foundation structure of electric power line pole tower according to claim 2; It is characterized in that; Said basic chassis (1-2) round platform bus be 30-55 ° along the angle a of Y axle vertical curve; The slope of bus is 0.577-1.42, and the slope of said Rock Embed based (2) round platform bus is 1/8～1/6.
4. the foundation structure of electric power line pole tower according to claim 2; It is characterized in that; The top of said basic principal post (1-1) is inserted with stone bolt (3), and said stone bolt (3) is from top to bottom through digging foundation (1) and Rock Embed based (2) and rebar cylinder mould (4) inside.
5. the foundation structure of electric power line pole tower according to claim 4; It is characterized in that; The length of said stone bolt (3) is greater than the height sum of digging foundation (1) with Rock Embed based (2); Stone bolt (3) top is provided with packing ring, locking nut and concrete enclosing cap (5), and the bottom is provided with crotch (3-1) or is welded with anchor slab.
6. the foundation structure of electric power line pole tower according to claim 1 is characterized in that, said rebar cylinder mould (4) is made up of some main muscle (4-1), several outer ring stirrups (4-2), several inner ring stirrups (4-3); Said each root master muscle (4-1) vertically is provided with along the Y axle, and said each outer ring stirrup (4-2) and each inner ring stirrup (4-3) are along X axle horizontally set.
7. the foundation structure of electric power line pole tower according to claim 6 is characterized in that, said each root master muscle (4-1) evenly distributes along circumference, and each outer ring stirrup (4-2) and each inner ring stirrup (4-3) are vertically arranged along the Y axle; Said each root master muscle (4-1) evenly is arranged between each outer ring stirrup (4-2) and each the inner ring stirrup (4-3); Said each outer ring stirrup (4-2) and each inner ring stirrup (4-3) be along each root master muscle (4-1) vertical arrangement up and down, and be welded to each other with each root master muscle (4-1) and reticulate cylinder.
8. the foundation structure of electric power line pole tower according to claim 1; It is characterized in that; The height of said rebar cylinder mould (4) is greater than the height of digging foundation (1), rebar cylinder mould (4) from top to bottom in digging foundation (1) and extend to Rock Embed based (2) inner with digging foundation (1) and Rock Embed based (2) build-in.
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| CN104499501A (en) * | 2014-12-08 | 2015-04-08 | 国家电网公司 | Narrow-foundation-tower single-pile pier-type self-stabilized foundation for power transmission line |
| CN105133907A (en) * | 2015-08-27 | 2015-12-09 | 国网河南省电力公司濮阳供电公司 | Multifunctional strained linear tower for power transmission lines |
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| CN110080270A (en) * | 2018-01-26 | 2019-08-02 | 中国电力科学研究院有限公司 | A kind of transmission line of electricity rock foundation construction method of basic skeleton integral hoisting |
| CN109797773A (en) * | 2019-03-11 | 2019-05-24 | 浙江大学城市学院 | The assembling type steel structure tower crane cushion cap of freely adjustable angles and positions |
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| CN112323845A (en) * | 2020-11-10 | 2021-02-05 | 国网新疆电力有限公司建设分公司 | Open caisson dado digging foundation for power transmission line iron tower in desert area |
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Application publication date: 20121219 |