CN107328548A - A kind of extra-high voltage multiloop power transmission tower Shape Coefficient test method - Google Patents
A kind of extra-high voltage multiloop power transmission tower Shape Coefficient test method Download PDFInfo
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- CN107328548A CN107328548A CN201710374715.7A CN201710374715A CN107328548A CN 107328548 A CN107328548 A CN 107328548A CN 201710374715 A CN201710374715 A CN 201710374715A CN 107328548 A CN107328548 A CN 107328548A
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- cross
- wind load
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/062—Wind tunnel balances; Holding devices combined with measuring arrangements
Abstract
The present invention discloses a kind of extra-high voltage multiloop power transmission tower Shape Coefficient test method, and it focuses on：The wind load of tower body model is determined first；Secondly the wind load of the Segment Model after tower body model is combined with cross-arm model is determined；The wind load that the wind load of tower body plus cross-arm is subtracted into tower body obtains the wind load of cross-arm.The present invention have it is practical, cost is relatively low, assay method advantage simple and easy to apply.
Description
Technical field
The present invention relates to work transmission line technical field, especially a kind of extra-high voltage multiloop power transmission tower Shape Coefficient examination
Proved recipe method, can effectively improve the efficiency and accuracy of measurement extra-high voltage multiloop power transmission tower Shape Coefficient.
Background technology
After southeast Shanxi 1000kV ultrahigh voltage alternating current transmission lines engineerings are built up, China build up successively again Wan electricity Dong give, Zhejiang
Northern semi-ring, Xi Meng-Shandong AC extra high voltage transmission line engineering are sent in river-Fujian, Wan electricity Dong, and Meng Xi-Tian Jinnan, elm be horizontal-
The AC extra high voltage engineering such as Weifang is built.Extra-high voltage large span transmission tower-line system becomes important lifeline engineering,
Simultaneously to save line corridor, multiloop long cantilever power transmission tower is widely applied.Such tower rigidity is small, and the cross-arm number of plies is more
And length is larger, wind scorpion is complicated.Compared with general overhead transmission line, due to big with housing structure height height, span
The features such as, will be stronger to wind sensitiveness.
Cross-arm is located at the top of tower, more sensitive to wind load, however, the structural shape factor of wind load at cross-arm fails in rule
Embodied in model, in Wind load calculating, generally it is not intended that the architectural feature of cross-arm, still using standard shape (such as rectangle, triangle
Tee section etc.) Shape Coefficient of cross-arm is calculated, this will cause the error that Wind load calculating and structure wind-excited responese are calculated.So
The Shape Coefficient of cross-arm is determined by wind tunnel test means, so as to accurately estimate that the wind load being applied to it is most important.
Because tower body and cross-arm architectural difference are very big, the design to power transmission tower at present is calculated, mainly by cross-arm and tower body
Separate computations, so as to need to obtain the Shape Coefficient of tower body and cross-arm respectively.
For this cancelled structure of power transmission tower, Shape Coefficient is mainly obtained by rigid model force test in wind tunnel
's.The connection of this kind of test requirements document model and the balance of bottom will be to be rigidly connected.
In the existing test method for determining power transmission tower Shape Coefficient, tower body is tested with cross-arm as an entirety,
It can only obtain the Shape Coefficient of whole steel tower, it is impossible to which the Shape Coefficient of tower body and cross-arm is measured respectively.
The content of the invention
There is provided one kind measurement extra-high voltage multiloop power transmission tower build system for the defect existed instant invention overcomes prior art
Several test methods, this method can measure the Shape Coefficient of cross-arm and tower body part respectively.
The technology used in the present invention means are as follows.
A kind of extra-high voltage multiloop power transmission tower Shape Coefficient test method, it focuses on：
A：Determine the wind load of tower body model；
B：Determine the wind load of the Segment Model after tower body model is combined with upper cross-arm model；
C：The wind load that the wind load that step B is determined subtracts step A measure obtains the wind load of cross-arm.
Wherein, using the shearing and moment of flexure of force balance rating model bottom, and then the wind load that computation model is subject to, institute
Tower body is stated to be rigidly connected with balance.
Wherein, tower body is fixedly connected on balance using cross steel plate, tower body is linked with cross steel plate using hot glue.
Wherein, cross-arm is fixed on tower body in stepb using iron wire and hot glue.
The present invention also provides another extra-high voltage multiloop power transmission tower Shape Coefficient test method, and the tower body has upper strata
Cross-arm and lower floor's cross-arm, its emphasis improve in：
A：Determine the wind load of tower body model；
B：Determine the wind load of the Segment Model after tower body model is combined with upper strata cross-arm model；
C：The wind load of the Segment Model after tower body model is combined with levels cross-arm model is determined again；
D：The wind load that the wind load that step B is determined subtracts step A measure obtains the wind load of upper strata cross-arm.
E：The wind load that the wind load that step C is determined subtracts step B measure obtains the wind load of lower floor's cross-arm.
Technique effect produced by the present invention：
(1) it is practical：The Shape Coefficient of cross-arm and tower body can be obtained respectively, meet the requirement of engineering design, can be with
Result of the test is directly used in actual engineering design.
(2) cost is relatively low：By loading and unloading cross-arm, the operating mode for whetheing there is cross-arm is realized.A cross-arm model need not be made, then
The built-up pattern that a cross-arm adds tower body is made, testing expenses are saved.
(3) assay method is simple and easy to apply：The handling of cross-arm can be realized by hot glue, quickly and easily, save test period.
Brief description of the drawings
Fig. 1 in the present invention in extra-high voltage multiloop power transmission tower top first segment model structural representation.
Fig. 2 is the structural representation of tower body in first segment model.
Fig. 3 is the structural representation of cross-arm in first segment model.
Fig. 4 is the structural representation of cross steel plate.
Fig. 5 is tower body and the structural representation of cross-arm annexation.
Fig. 6 is the overall structure diagram of extra-high voltage multiloop power transmission tower.
Figure number explanation
1- tower bodies, 2- cross-arms, the cross steel plates of 3-, 4- tie points.
Embodiment
As shown in fig. 6, being the overall structure diagram of extra-high voltage multiloop power transmission tower.Whole power transmission tower is divided into first
Multiple tower sections, the tower body 1 of each tower section and the rigid model of cross-arm 2 are made using lucite respectively.Whole tower model is from upper
Under be divided into 4 sections：First segment model, second section model, the 3rd Segment Model, fourth segment model.Fourth stage
Model contains the 4th layer of cross-arm and layer 5 cross-arm of number from top to bottom and the lower section tower body being connected with cross-arm.Due to the 5th
The tower body of layer cross-arm connection is very short, so integrally regarding the 4th layer of cross-arm and layer 5 cross-arm as fourth segment model.Lower section
The part (part below position that the tower body gradient is undergone mutation) of tower body is not as Segment Model.
Each section is tested respectively, is illustrated, is referred to by taking first Segment Model of top of tower as an example below
Described in Fig. 1 to Fig. 5：
First, the tower body 1 in first segment model is connected with cross steel plate by hot glue, then using bolt by cross
Shape steel plate is fixed on force balance.This connection both can guarantee that being rigidly connected for model and balance, and not make model and balance
The mass of system of composition is too heavy, it is ensured that the high-strength light of model and balance, meets the requirement of force test in wind tunnel, uses dynamometry
The shearing and moment of flexure of balance rating model bottom, and then the wind load that computation model is subject to, the tower body are rigidly connected with balance.
The wind load of tower body model is determined in this step using prior art.
Secondly, connected between cross-arm 2 and tower body 1 by hot glue and iron wire, form the tie point 4 as shown in Fig. 4, both protected
The solid and reliable of connection has been demonstrate,proved, meanwhile, the monnolithic case of model is not interfered with again, does not interfere with the accuracy of result of the test.
In experiment, do not occur cross-arm and come off and determined because cross-arm is connected in the insecure phenomenon for causing cross-arm to vibrate, this step
Tower body model add cross-arm combine after Segment Model wind load, the Shape Coefficient of cross-arm is calculated with this.
Finally, the wind load on Segment Model that tower body 1 plus cross-arm 2 are combined subtracts the model of tower body 1 first determined
Wind load be the wind load being subject on cross-arm.Because wind load subtracts each other twice, reduce the situation of number in the absence of big number, so
Error very little, method is feasible.
Also there is another method of testing, that is, the method for testing layer 5 cross-arm, because connection layer 5 is horizontal in the present invention
The tower body of load is very short, so integrally regarding the 4th layer of cross-arm and layer 5 cross-arm as fourth segment model.Test layer 5 horizontal
The method of load is as follows：
A：Determine the wind load of tower body model；
B：Determine the wind load of the Segment Model after tower body model is combined with upper strata cross-arm model (the 4th layer of cross-arm)；
C：The wind lotus of the stage model after tower body model is combined with levels cross-arm model (fourth, fifth layer of cross-arm) is determined again
Carry；
D：The wind load that the wind load that step B is determined subtracts step A measure obtains upper strata cross-arm (the 4th layer of cross-arm)
Wind load.
E：The wind load that the wind load that step C is determined subtracts step B measure obtains lower floor's cross-arm (layer 5 cross-arm)
Wind load.
It should be noted that the structure of each Segment Model has no effect on other in extra-high voltage multiloop power transmission tower in experiment
The result of section.
Claims (5)
1. a kind of extra-high voltage multiloop power transmission tower Shape Coefficient test method, it is characterised in that：
A：Determine the wind load of tower body model；
B：Determine the wind load of the Segment Model after tower body model is combined with cross-arm model；
C：The wind load that the wind load that step B is determined subtracts step A measure obtains the wind load of cross-arm.
2. a kind of extra-high voltage multiloop power transmission tower Shape Coefficient test method as claimed in claim 1, it is characterised in that：Use
The shearing and moment of flexure of force balance rating model bottom, and then the wind load that computation model is subject to, the tower body and balance rigidity
Connection.
3. a kind of extra-high voltage multiloop power transmission tower Shape Coefficient test method as claimed in claim 2, it is characterised in that：Use
Tower body is fixedly connected on balance by cross steel plate, and tower body is linked with cross steel plate using hot glue.
4. a kind of extra-high voltage multiloop power transmission tower Shape Coefficient test method as claimed in claim 3, it is characterised in that：Use
Cross-arm is fixed on tower body by iron wire and hot glue in stepb.
5. a kind of extra-high voltage multiloop power transmission tower Shape Coefficient test method, the tower body has upper strata cross-arm and lower floor's cross-arm,
It is characterized in that：
A：Determine the wind load of tower body model；
B：Determine the wind load of the Segment Model after tower body model is combined with upper strata cross-arm model；
C：The wind load of the stage model after tower body model is combined with levels cross-arm is determined again；
D：The wind load that the wind load that step B is determined subtracts step A measure obtains the wind load of upper strata cross-arm.
E：The wind load that the wind load that step C is determined subtracts step B measure obtains the wind load of lower floor's cross-arm.
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| CN201710374715.7A CN107328548A (en) | 2017-05-24 | 2017-05-24 | A kind of extra-high voltage multiloop power transmission tower Shape Coefficient test method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181079A (en) * | 2017-12-21 | 2018-06-19 | 浙江大学 | A kind of power transmission tower cross-arm Shape Coefficient air tunnel testing device based on double balances |
| CN108318209A (en) * | 2018-01-22 | 2018-07-24 | 南昌大学 | The wind load model assay systems and test method of chimney |
| CN110375947A (en) * | 2019-07-05 | 2019-10-25 | 浙江大学 | A kind of the field measurement device and test method of power transmission tower Shape Coefficient |
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| CN102609579A (en) * | 2012-01-31 | 2012-07-25 | 浙江省电力设计院 | Three-dimensional wind-resistant design method for power transmission tower |
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| CN105741182A (en) * | 2014-12-08 | 2016-07-06 | 国家电网公司 | Method of determining power transmission line iron tower cross-arm wind load |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181079A (en) * | 2017-12-21 | 2018-06-19 | 浙江大学 | A kind of power transmission tower cross-arm Shape Coefficient air tunnel testing device based on double balances |
| CN108181079B (en) * | 2017-12-21 | 2019-05-28 | 浙江大学 | A kind of power transmission tower cross-arm Shape Coefficient air tunnel testing device based on double balances |
| CN108318209A (en) * | 2018-01-22 | 2018-07-24 | 南昌大学 | The wind load model assay systems and test method of chimney |
| CN110375947A (en) * | 2019-07-05 | 2019-10-25 | 浙江大学 | A kind of the field measurement device and test method of power transmission tower Shape Coefficient |
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Application publication date: 20171107 |
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