CN106437275A - Electric transmission line iron tower cross arm additional prestress strengthening method - Google Patents
Electric transmission line iron tower cross arm additional prestress strengthening method Download PDFInfo
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- CN106437275A CN106437275A CN201510498433.9A CN201510498433A CN106437275A CN 106437275 A CN106437275 A CN 106437275A CN 201510498433 A CN201510498433 A CN 201510498433A CN 106437275 A CN106437275 A CN 106437275A
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Abstract
The invention relates to an electric transmission line iron tower cross arm additional prestress strengthening method. A cross arm comprises a cross arm body and a wire hanging plate arranged on the body. The cross arm body comprises an upper planer principal material, a bottom principal material connected with the upper planer principal material, and a diagonal member connecting the upper planer principal material and a lower principal material. The method comprises the steps that inhaul cable arrangement modes are selected according to the cross arm conditions; an inhaul cable is arranged on the cross arm so as to strengthen the cross arm; and the cross arm provided with the inhaul cable is subjected to stress analysis. According to the technical scheme, transfer paths of external loads on a structure can be effectively changed, and thus the mechanical property of weak links of the structure is improved.
Description
Technical field：
The present invention relates to iron tower of power transmission line field, it is more particularly to a kind of iron tower of power transmission line cross-arm additional
Prestress strengthening method.
Background technology：
Under ice load effect, when ice covering thickness increases, the stress of cross-arm main material is often unfavorable, studies number
According to showing that under icing operating mode cross-arm main material is the weak link of stress, it is easily destroyed, this is mainly covering
Load on ice action lower wire is very big, leads to the vertical load of hanging wire point excessive, under this force
Cross-arm winds up tension, and lower edge is pressurized easily to reach its limit state, and then destroys.Therefore may meet with
Icing disaster or other in the case of, need consider cross-arm the need of reinforcing.
Increase drag-line outside cross-arm, one end of drag-line is connected with tower body, and the other end is connected with cross-arm lower edge,
So in the presence of conducting wire hanging point vertical load, drag-line can directly bear a part of load, can reduce horizontal stroke
The internal force of load main material, and then improve the bearing capacity of structure.But there is following limitation in this reinforcement means：
Drag-line reinforce cross-arm only to the effect of hanging point vertical load effectively it is impossible to reduce laterally uneven, wire
The load effect of cross-arm under power.
Content of the invention：
It is an object of the invention to provide a kind of additional prestress strengthening method of iron tower of power transmission line cross-arm, permissible
Effectively change external load bang path in structure, and then improve the stress of structural weak link
Energy.
For achieving the above object, the present invention employs the following technical solutions：Outside a kind of iron tower of power transmission line cross-arm
Prestressing reinforcement means, described cross-arm includes cross-arm body and setting thread gripping-board on the body；
Described cross-arm body includes lower plane main material that plane main material is connected with upper plane main material and connects flat
Face main material and the oblique material of lower plane main material；Including：
Drag-line arrangement is chosen according to cross-arm condition；
Described drag-line is arranged on described cross-arm, thus reinforcing to described cross-arm；
Force analysis is carried out to the cross-arm being provided with drag-line.
Described drag-line arrangement includes drag-line arrangement one and drag-line arrangement two；Described drag-line cloth
Putting mode one is；Described drag-line plane main material outer along along described cross-arm is arranged on plane master on described cross-arm
On material, its drag-line two ends is correspondingly arranged at the two ends of plane main material on described cross-arm respectively；Described drag-line cloth
Putting mode two is：Described drag-line plane main material outer along along described cross-arm is arranged on plane master on described cross-arm
On material, its drag-line two ends is correspondingly arranged in described cross-arm lower plane main material respectively.
Described drag-line is arranged in and symmetrically and evenly arranges on the member section of described cross-arm, described drag-line section weight
The heart is close to be reinforced cross-arm member section center of gravity.
Described drag-line is arranged on described cross-arm by anchoring stretch-draw node.
If electric power pylon has erection opening, fix anchoring stretch-draw node using described erection opening；If
No, can be using gaily decorated basket regulating bolt or direct tightening nuts fixing anchoring stretch-draw node.
Described force analysis is carried out on the basis of the simplified model according to the described cross-arm being provided with drag-line；It is provided with
The overall prestressed truss structure of the cross-arm of drag-line is considered as static indeterminacy system and carries out Calculation and Analysis of Force, described
Drag-line internal force is pressed force method as redundancy power and is solved.
Described cross-arm superstructure and load are reduced to act on the concentration power on cross-arm；Described cross-arm bottom
Tower body structure is considered as the support of cross-arm；The wire vertical load of electric power pylon is acted in the form of concentration power
On the hanging wire point of cross-arm；The deadweight of cross-arm is not considered in force analysis.
With immediate prior art ratio, the present invention provides technical scheme to have following excellent effect
1st, technical solution of the present invention is applied to when the cross-arm of iron tower of power transmission line needs to be reinforced；
2nd, technical solution of the present invention can effectively improve the vertical bearing capacity of structure；
3rd, technical solution of the present invention materials are saved, economical and efficient；
4th, technical solution of the present invention reduces electric power pylon and is destroyed by icing.
Brief description
Fig. 1 is layout pattern one structural representation of drag-line during the drag-line reinforcing cross-arm of the embodiment of the present invention；
The structural representation of the layout pattern two of drag-line when Fig. 2 reinforces cross-arm for embodiment of the present invention drag-line；
Fig. 3 is the simplified mathematical model schematic diagram of the drag-line reinforcing cross-arm of the embodiment of the present invention.
Specific embodiment
With reference to embodiment, the invention will be described in further detail.
Embodiment 1：
The invention of this example provides a kind of additional prestress strengthening method of iron tower of power transmission line cross-arm, including：
1 drag-line arrangement
Iron tower construction member is reinforced using additional prestressed method, should according to be reinforced component stress property,
Construction features and field condition, choose maximally effective drag-line arrangement.
When drag-line reinforces cross-arm, the layout pattern of drag-line can have two ways as illustrated in fig. 1 and 2.
2. ruggedized construction force analysis method：
, similar to truss structure, the simplified model after drag-line reinforces cross-arm is as shown in Figure 3 for steel tower：
(1) cross-arm superstructure and load are reduced to concentration power and act on cross-arm.
(2) cross-arm bottom tower body structure is considered as the supporting condition of cross-arm.
(3) on the hanging wire point that conductor load acts on cross-arm in the form of the concentration power.
(4) do not consider the deadweight of cross-arm.
The cross-arm integrated prestress truss structure being provided with drag-line can be considered that static indeterminacy system is calculated, drag-line
Internal force is pressed force method as redundancy power and is solved.
High-strength anchor-hold and stretch-draw node may be selected in double limb angle steel at cross-arm hanging wire.If steel tower has installation
With hole, then can fix stretch-draw node using erection opening；If no, tensioning section can be redesigned
Point.Prestressing force can be applied using gaily decorated basket regulating bolt or direct tightening nuts etc..
Other require with reference to existing《Prestressed steel structure technical regulation》(CECS212).
In addition, when being reinforced using drag-line constructively with analysis on should be noted following some：
(1) reinforcing being arranged on member section of rope should be symmetrically evenly distributed, reinforces rope centroid of section and tries one's best
Near being reinforced centroid of section.When rope section is longer, for ensureing rope and reinforcing section cooperation, in
Between some junction points are set, typically will be every the distance dividing plate of 40～50 times of section least radiuses of gyration
Drag-line is connected with rod member.Dividing plate is welded along contact edge with bar limb, and on dividing plate, apertured hole allows drag-line to pass through.
Hole and the gap as less as possible (1～2mm) of rope, both can allow drag-line freely to stretch longitudinal in hole,
Ensure that drag-line and the horizontal cooperation of rod member.Also dividing plate can be replaced with pipe section or angle steel section, construction
Simply, but its consolidation effect be not so good as dividing plate.
(2) in the either phase of prestressed stretch-draw and bearing load, when tension member occurs pressurized situation,
Must be calculated according to the design principle of depression bar, its strength and stability will be checked.
(3) anchor-hold node and turning point node are key node, the construction of node and the weld seams of steel tower
Must assure that safely and reliably transmission drag-line power, and each limb of drag-line to be considered make a concerted effort pass through bar cross section weight
The heart.Want reinforcing joint plate to ensure its local stability, arc will be set up with guiding set in drag-line turning point
Middle load uniformly transfers.The reduction of drag-line intensity and arranging of reducing friction resistance to be considered in drag-line turning point
Apply.
Finally it should be noted that：Above example is only in order to illustrate technical scheme rather than to it
Limit, although those of ordinary skill in the art should be understood with reference to above-described embodiment：Still can be right
The specific embodiment of the present invention is modified or equivalent, and these are without departing from present invention spirit and model
Any modification enclosed or equivalent, all apply for the pending present invention claims it
Interior.
Claims (7)
1. the additional prestress strengthening method of a kind of iron tower of power transmission line cross-arm, described cross-arm include cross-arm body and
Setting thread gripping-board on the body；Described cross-arm body includes plane main material and upper plane main material connects
The lower plane main material connecing and the oblique material connecting upper plane main material and lower plane main material；It is characterized in that：Including：
Drag-line arrangement is chosen according to cross-arm condition；
Described drag-line is arranged on described cross-arm, thus reinforcing to described cross-arm；
Force analysis is carried out to the cross-arm being provided with drag-line.
2. the additional prestress strengthening method of a kind of iron tower of power transmission line cross-arm as claimed in claim 1, it is special
Levy and be：Described drag-line arrangement includes drag-line arrangement one and drag-line arrangement two；Described drag-line
Arrangement one is；Described drag-line plane main material outer along along described cross-arm is arranged on plane master on described cross-arm
On material, its drag-line two ends is correspondingly arranged at the two ends of plane main material on described cross-arm respectively；Described drag-line arrangement
Mode two is：Described drag-line plane main material outer along along described cross-arm is arranged in plane main material on described cross-arm,
Its drag-line two ends is correspondingly arranged in described cross-arm lower plane main material respectively.
3. the additional prestress strengthening method of a kind of iron tower of power transmission line cross-arm as claimed in claim 2, it is special
Levy and be：Described drag-line is arranged in and symmetrically and evenly arranges on the member section of described cross-arm, described drag-line section
Center of gravity is close to be reinforced cross-arm member section center of gravity.
4. the additional prestress strengthening method of a kind of iron tower of power transmission line cross-arm as claimed in claim 3, it is special
Levy and be：Described drag-line is arranged on described cross-arm by anchoring stretch-draw node.
5. the additional prestress strengthening method of a kind of iron tower of power transmission line cross-arm as claimed in claim 4, it is special
Levy and be：If electric power pylon has erection opening, fix anchoring stretch-draw node using described erection opening；
If no, can be using gaily decorated basket regulating bolt or direct tightening nuts fixing anchoring stretch-draw node.
6. the additional prestress strengthening method of a kind of iron tower of power transmission line cross-arm as claimed in claim 1, it is special
Levy and be：Described force analysis is carried out on the basis of the simplified model according to the described cross-arm being provided with drag-line；If
The prestressed truss structure having the cross-arm entirety of drag-line is considered as static indeterminacy system and carries out Calculation and Analysis of Force, described
Drag-line internal force is pressed force method as redundancy power and is solved.
7. the additional prestress strengthening method of a kind of iron tower of power transmission line cross-arm as claimed in claim 6, it is special
Levy and be：Described cross-arm superstructure and load are reduced to act on the concentration power on cross-arm；Under described cross-arm
Portion's tower body structure is considered as the support of cross-arm；The wire vertical load of electric power pylon is acted in the form of concentration power
On the hanging wire point of cross-arm；The deadweight of cross-arm is not considered in force analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510498433.9A CN106437275B (en) | 2015-08-13 | 2015-08-13 | A kind of additional prestress strengthening method of iron tower of power transmission line cross-arm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510498433.9A CN106437275B (en) | 2015-08-13 | 2015-08-13 | A kind of additional prestress strengthening method of iron tower of power transmission line cross-arm |
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| CN106437275A true CN106437275A (en) | 2017-02-22 |
| CN106437275B CN106437275B (en) | 2019-03-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107747424A (en) * | 2017-11-27 | 2018-03-02 | 深圳带路科技有限公司 | A kind of nested type reinforces steel tower |
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| CN86203751U (en) * | 1986-06-11 | 1987-12-12 | 北京电力设备总厂 | Prestress concrete cable tower |
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| CN202520047U (en) * | 2012-03-05 | 2012-11-07 | 浙江盛达铁塔有限公司 | Iron tower cross arm hanging frame |
| CN102839845A (en) * | 2012-08-24 | 2012-12-26 | 中国电力科学研究院 | Tower node connection device made from composite material |
| CN202925981U (en) * | 2012-11-16 | 2013-05-08 | 中国电力工程顾问集团西北电力设计院 | 750kV composite material cross arm |
| CN203905597U (en) * | 2014-06-04 | 2014-10-29 | 国家电网公司 | Combined type high-low cross arm with drilling and crossing functions |
| CN203947845U (en) * | 2014-07-03 | 2014-11-19 | 国家电网公司 | Improve the structure of electric power pylon cross-arm vertical bearing capacity |
| CN104295147A (en) * | 2014-10-21 | 2015-01-21 | 中国电力工程顾问集团西北电力设计院 | Framework applicable to transformer substation outgoing lines |
| CN104420696A (en) * | 2013-08-28 | 2015-03-18 | 徐聪 | Box type tower cross arm |
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2015
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| CN86203751U (en) * | 1986-06-11 | 1987-12-12 | 北京电力设备总厂 | Prestress concrete cable tower |
| EP1335083B1 (en) * | 2002-02-09 | 2005-06-01 | SAG Energieversorgungslösungen GmBH | Method for renovating power pylons consisting of steel lattices |
| JP4462941B2 (en) * | 2004-01-28 | 2010-05-12 | 中国電力株式会社 | Method for supporting the design of a single leg in a transmission line tower, a design method for a single joint, a computer program, a program storage medium |
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| CN202227755U (en) * | 2011-08-12 | 2012-05-23 | 栾川县电业局 | Cable-stayed tower for power transmission line of power grid |
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| CN203905597U (en) * | 2014-06-04 | 2014-10-29 | 国家电网公司 | Combined type high-low cross arm with drilling and crossing functions |
| CN203947845U (en) * | 2014-07-03 | 2014-11-19 | 国家电网公司 | Improve the structure of electric power pylon cross-arm vertical bearing capacity |
| CN104295147A (en) * | 2014-10-21 | 2015-01-21 | 中国电力工程顾问集团西北电力设计院 | Framework applicable to transformer substation outgoing lines |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107747424A (en) * | 2017-11-27 | 2018-03-02 | 深圳带路科技有限公司 | A kind of nested type reinforces steel tower |
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| CN106437275B (en) | 2019-03-05 |
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