CN106437275B - A kind of additional prestress strengthening method of iron tower of power transmission line cross-arm - Google Patents
A kind of additional prestress strengthening method of iron tower of power transmission line cross-arm Download PDFInfo
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- CN106437275B CN106437275B CN201510498433.9A CN201510498433A CN106437275B CN 106437275 B CN106437275 B CN 106437275B CN 201510498433 A CN201510498433 A CN 201510498433A CN 106437275 B CN106437275 B CN 106437275B
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 230000005540 biological transmission Effects 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 11
- 238000005728 strengthening Methods 0.000 title claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 34
- 238000004458 analytical method Methods 0.000 claims abstract description 11
- 238000004873 anchoring Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000005192 partition Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- Electric Cable Installation (AREA)
- Suspension Of Electric Lines Or Cables (AREA)
Abstract
The present invention relates to a kind of additional prestress strengthening method of iron tower of power transmission line cross-arm, the cross-arm includes the thread gripping-board of cross-arm body and setting on the body；The cross-arm body includes upper plane main material, the bottom main material connecting with upper plane main material and the oblique material for connecting upper plane main material and lower plane main material；It include: that drag-line arrangement is chosen according to cross-arm condition；The drag-line is arranged on the cross-arm, to be reinforced to the cross-arm；Force analysis is carried out to the cross-arm for being equipped with drag-line.Technical solution of the present invention can effectively change transmission path of the external load in structure, and then improve the stress performance of structural weak link.
Description
Technical field:
The present invention relates to iron tower of power transmission line field, it is more particularly to a kind of outer Prestressing of iron tower of power transmission line cross-arm and adds
Solid method.
Background technique:
Under ice load effect, the stress of cross-arm main material is often unfavorable when ice covering thickness increases, and data shows
Cross-arm main material is the weak link of stress under icing operating condition, is easily destroyed, this mainly acts on the load on lower wire in icing
It is very big, cause the vertical load of hanging wire point excessive, cross-arm winds up tension under this force, and lower edge compression easily reaches its pole
Limit state, and then destroy.Therefore in the case that may meet with icing disaster or other, need to consider whether cross-arm needs reinforcement.
Increase drag-line outside cross-arm, one end of drag-line is connect with tower body, and the other end is connect with cross-arm lower edge, is being led in this way
Under the action of line hanging point vertical load, drag-line can directly bear a part of load, can reduce the internal force of cross-arm main material, and then improve
The bearing capacity of structure.But the following limitations exist for this reinforcement means: drag-line reinforces cross-arm only to hanging point vertical load
Effect effectively, cannot reduce the load effect of cross-arm under the lateral unbalanced tensile force of conducting wire.
Summary of the invention:
The object of the present invention is to provide a kind of additional prestress strengthening methods of iron tower of power transmission line cross-arm, can effectively change
Become transmission path of the external load in structure, and then improves the stress performance of structural weak link.
To achieve the above object, the invention adopts the following technical scheme: a kind of outer Prestressing of iron tower of power transmission line cross-arm
Reinforcement means, the cross-arm include the thread gripping-board of cross-arm body and setting on the body；The cross-arm body includes upper flat
Face main material, the lower plane main material being connect with upper plane main material and the oblique material for connecting upper plane main material and lower plane main material；Include:
Drag-line arrangement is chosen according to cross-arm condition；
The drag-line is arranged on the cross-arm, to be reinforced to the cross-arm；
Force analysis is carried out to the cross-arm for being equipped with drag-line.
The drag-line arrangement includes drag-line arrangement one and drag-line arrangement two；The drag-line arrangement one
For；Drag-line plane main material outer along the cross-arm is arranged on the cross-arm in plane main material, drag-line both ends difference
It is correspondingly arranged at the both ends of plane main material on the cross-arm；The drag-line arrangement two are as follows: the drag-line is along the cross-arm
Plane main material outer is arranged on the cross-arm in plane main material, and drag-line both ends, which respectively correspond, to be arranged in the cross-arm lower plane
In main material.
The drag-line is arranged on the member section of the cross-arm and symmetrically and evenly arranges, and the drag-line centroid of section is close to quilt
Reinforce cross-arm member section center of gravity.
The drag-line is arranged on the cross-arm by anchoring stretch-draw node.
If electric power pylon has erection opening, anchoring stretch-draw node is fixed using the erection opening；If no, can adopt
Bolt is adjusted with the gaily decorated basket or direct tightening nuts fix anchoring stretch-draw node.
The force analysis carries out on the basis of the simplified model according to the cross-arm equipped with drag-line；Cross equipped with drag-line
The whole prestressed truss structure of load is considered as static indeterminacy system and carries out Calculation and Analysis of Force, and the drag-line internal force is pressed as redundancy power
Force method solves.
The cross-arm superstructure and load are reduced to act on the concentrated force on cross-arm；Cross-arm lower part tower body structure
It is considered as the support of cross-arm；The conducting wire vertical load of electric power pylon is acted in the form of concentrated force on the hanging wire point of cross-arm；By
The self weight of cross-arm is not considered in power analysis.
Compared with the nearest prior art, the technical scheme provide by that invention has the following excellent effect
1, technical solution of the present invention is suitable for when the cross-arm of iron tower of power transmission line is reinforced；
2, technical solution of the present invention can effectively improve the vertical bearing capacity of structure；
3, technical solution of the present invention materials are saved, economical and efficient；
4, technical solution of the present invention reduces electric power pylon and is destroyed by icing.
Detailed description of the invention
Fig. 1 is one structural schematic diagram of layout pattern of drag-line when the drag-line of the embodiment of the present invention reinforces cross-arm；
Fig. 2 is the structural schematic diagram of the layout pattern two of drag-line when drag-line of the embodiment of the present invention reinforces cross-arm；
Fig. 3 is that the drag-line of the embodiment of the present invention reinforces the simplified mathematical model schematic diagram of cross-arm.
Specific embodiment
Below 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, comprising:
1 drag-line arrangement
Iron tower construction member is reinforced using additional prestressed method, it should be according to stress property, the construction features for being reinforced component
And field condition, choose most effective drag-line arrangement.
The layout pattern of drag-line can have two ways as illustrated in fig. 1 and 2 when drag-line reinforces cross-arm.
2. ruggedized construction force analysis method:
Steel tower is similar to truss structure, and the simplified model after drag-line reinforcing cross-arm is as shown in Figure 3:
(1) cross-arm superstructure and load are reduced to concentrated force and act on cross-arm.
(2) cross-arm lower part tower body structure is considered as the supporting condition of cross-arm.
(3) conductor load is acted in the form of concentrated force on the hanging wire point of cross-arm.
(4) self weight of cross-arm is not considered.
Cross-arm integrated prestress truss structure equipped with drag-line can be considered that static indeterminacy system is calculated, drag-line internal force conduct
Redundancy power is solved by force method.
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 erection opening,
Erection opening can be used to fix stretch-draw node；If stretch-draw node no, can be redesigned.The gaily decorated basket can be used and adjust bolt
Or directly tightening nuts etc. apply prestressing force.
Other are required referring to existing " prestressed steel structure technology regulation " (CECS212).
In addition, when being reinforced using drag-line constructively with should be noted the following in analysis:
(1) reinforcing being arranged on member section for rope should be symmetrical evenly distributed, reinforces rope centroid of section as close as possible to being added
Gu centroid of section.It when rope section is longer, is worked together to guarantee rope and reinforcing section, several tie points are set in centre, generally
Drag-line to be connected with rod piece with partition every the distance of 40~50 times of section least radiuses of gyration.Partition is along contact edge and bar limb
It welds, apertured hole allows drag-line to pass through on partition.Hole and the gap of rope are (1~2mm) more as small as possible, both allow drag-line every
Longitudinal free extension in hole ensures that drag-line and rod piece laterally work together.Partition can also be replaced with round tube section or angle steel section,
Simple structure, but its consolidation effect is not so good as partition.
(2) in the either phase of prestressed stretch-draw and bearing load, when tension member will appear compression situation, it is necessary to according to
The design principle of compression bar is calculated, its strength and stability is checked.
(3) anchor-hold node and turning point node are the key nodes of steel tower, and the construction and weld seam of node must assure that
Drag-line power is safely and reliably transmitted, and to consider that the resultant force of each limb of drag-line passes through bar cross section center of gravity.Reinforcing joint plate is wanted to guarantee
Its local stability will add arc panel in drag-line turning point to guide load to uniformly transfer.It to be examined in drag-line turning point
Consider the reduction of drag-line intensity and the measure of reducing friction resistance.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute
The those of ordinary skill in category field is although should be understood with reference to the above embodiments: still can be to a specific embodiment of the invention
It is modified or replaced equivalently, these are without departing from any modification of spirit and scope of the invention or equivalent replacement, in Shen
Within claims of the invention that please be pending.
Claims (1)
1. a kind of additional prestress strengthening method of iron tower of power transmission line cross-arm, the cross-arm includes cross-arm body and is arranged described
Thread gripping-board on ontology；The cross-arm body includes upper plane main material, the lower plane main material and connection that connect with upper plane main material
The oblique material of upper plane main material and lower plane main material；It is characterized by comprising:
Drag-line arrangement is chosen according to cross-arm condition；
The drag-line is arranged on the cross-arm, to be reinforced to the cross-arm；
Force analysis is carried out to the cross-arm for being equipped with drag-line；
The drag-line arrangement includes drag-line arrangement one and drag-line arrangement two；The drag-line arrangement one is；
Drag-line plane main material outer along the cross-arm is arranged on the cross-arm in plane main material, and drag-line both ends respectively correspond
The both ends of plane main material on the cross-arm are set；The drag-line arrangement two are as follows: drag-line plane along the cross-arm
Main material outer is arranged on the cross-arm in plane main material, and drag-line both ends, which respectively correspond, to be arranged in the cross-arm lower plane main material
On；
The drag-line is arranged on the member section of the cross-arm and symmetrically and evenly arranges, and the drag-line centroid of section is close to be reinforced
Cross-arm member section center of gravity；
The drag-line is arranged on the cross-arm by anchoring stretch-draw node；
If electric power pylon has erection opening, anchoring stretch-draw node is fixed using the erection opening；If flower no, can be used
Basket adjusts bolt or the fixed anchoring stretch-draw node of direct tightening nuts；
The force analysis carries out on the basis of the simplified model according to the cross-arm equipped with drag-line；Cross-arm equipped with drag-line is whole
The prestressed truss structure of body is considered as static indeterminacy system and carries out Calculation and Analysis of Force, and the drag-line internal force presses force method as redundancy power
It solves；
The cross-arm superstructure and load are reduced to act on the concentrated force on cross-arm；Cross-arm lower part tower body structure is considered as
The support of cross-arm；The conducting wire vertical load of electric power pylon is acted in the form of concentrated force on the hanging wire point of cross-arm；In stress point
The self weight of cross-arm is not considered in 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 |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN106437275A CN106437275A (en) | 2017-02-22 |
| CN106437275B true CN106437275B (en) | 2019-03-05 |
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| 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 |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101736935A (en) * | 2010-03-01 | 2010-06-16 | 国网电力科学研究院武汉南瑞有限责任公司 | Easy-to-transport electric power accident rush-repairing tower |
| CN101736936A (en) * | 2010-03-04 | 2010-06-16 | 国网电力科学研究院武汉南瑞有限责任公司 | Novel modularized emergency first-aid repair tower |
| CN202227755U (en) * | 2011-08-12 | 2012-05-23 | 栾川县电业局 | Cable-stayed tower for power transmission line of power grid |
| 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 |
-
2015
- 2015-08-13 CN CN201510498433.9A patent/CN106437275B/en active Active
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101736935A (en) * | 2010-03-01 | 2010-06-16 | 国网电力科学研究院武汉南瑞有限责任公司 | Easy-to-transport electric power accident rush-repairing tower |
| CN101736936A (en) * | 2010-03-04 | 2010-06-16 | 国网电力科学研究院武汉南瑞有限责任公司 | Novel modularized emergency first-aid repair tower |
| CN202227755U (en) * | 2011-08-12 | 2012-05-23 | 栾川县电业局 | Cable-stayed tower for power transmission line of power grid |
| 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 |
| CN104420696A (en) * | 2013-08-28 | 2015-03-18 | 徐聪 | Box type tower 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 |
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| CN106437275A (en) | 2017-02-22 |
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