CN101781937A - Ice-resisting and strengthening reconstruction method of existing power transmission tower - Google Patents
Ice-resisting and strengthening reconstruction method of existing power transmission tower Download PDFInfo
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- CN101781937A CN101781937A CN 201010121884 CN201010121884A CN101781937A CN 101781937 A CN101781937 A CN 101781937A CN 201010121884 CN201010121884 CN 201010121884 CN 201010121884 A CN201010121884 A CN 201010121884A CN 101781937 A CN101781937 A CN 101781937A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 26
- 238000005728 strengthening Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000010276 construction Methods 0.000 claims abstract description 12
- 230000002787 reinforcement Effects 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims abstract 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 229910052742 iron Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 238000011156 evaluation Methods 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 8
- 230000006378 damage Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000002715 modification method Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 238000010205 computational analysis Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
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- 238000004891 communication Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Abstract
本发明属于输电设备技术领域，具体公开了一种既有输电塔的抗冰加固改造方法，包括在输电塔高度范围内适当增加横隔面数以提高既有输电铁塔整体刚度和稳定性，以及根据不同的塔形在输电塔薄弱部位采取增大杆件截面面积的方法提高局部承载力；考虑到现场施工时输电塔结构的安全，本发明同时提出了加固时的施工方法。本发明具有设计施工简便，用钢量小且效果显著，可广泛用于既有输电塔的抗冰加固改造中，以达到提高输电塔刚度、减少寒冷天气中因输电塔的破坏而引起的重大社会损失。
The invention belongs to the technical field of power transmission equipment, and specifically discloses an anti-icing strengthening modification method of an existing power transmission tower, which includes appropriately increasing the number of transverse partitions within the height range of the power transmission tower to improve the overall rigidity and stability of the existing power transmission tower, and According to different tower shapes, the method of increasing the cross-sectional area of the rod is adopted at the weak part of the transmission tower to improve the local bearing capacity; considering the safety of the transmission tower structure during on-site construction, the invention also proposes a construction method during reinforcement. The invention has the advantages of simple design and construction, small amount of steel and significant effect, and can be widely used in the anti-icing strengthening transformation of existing transmission towers to improve the rigidity of transmission towers and reduce major damage caused by damage to transmission towers in cold weather. social loss.
Description
Technical field
The invention belongs to the transmission facility technical field, be specifically related to the power transmission tower strengthening reconstruction and the job practices of a kind of power system important structure-electric power pylon opposing ice loading.
Background technology
On January 10th, 2008 beginning, the most of area of southern china have suffered the severe snow sleet of the fifty year return period weather that congeals.The destruction that bad weather has caused very big degree to disaster area electric power, communication, highway, railway and urban lifeline facility, life has caused great inconvenience to the people's ordinary production, has brought huge economy and property loss to country.In the middle of this ice and snow disaster, power system is disaster-stricken the most serious, a large amount of power transmission tower subjects to severe risks of damage, influence the hugest, and indirect influence some other industry, as railway transportation and urban water supply.Historically, 1954 in November, 2006, China takes place 35 kilovolts and above electric pressure is larger and cause the electrical network icing disaster case of certain consequence to have more than 86 examples.According to the existing designed high voltage power transmission iron tower ubiquity body of the tower tabula face of electric power line pole tower design discipline less this problem is set.In this case, the local vibration shape of iron tower structure is very serious, under the dynamic action of wind, if evoke the local vibration shape, probably causes the dynamic buckling of structure to destroy.Static Calculation also shows do not have the diagonal brace of the tower section of tabula face to have very large outer distortion to take place.The considerable damage of power transmission tower has proved absolutely the deficiency of existing power transmission tower aspect structure design in ice damage, and it is a problem that urgently will solve at present that existing power transmission tower is carried out ice-resisting and strengthening reconstruction.And for this problem, because external this type of accident is very rare, to the present still blank of its reinforcement means.The present invention is based on a large amount of tests and computational analysis and proposed a kind of very effective ice-resisting and strengthening reconstruction method that is used for existing electric power pylon.
Summary of the invention
The object of the present invention is to provide a kind of convenient, fast construction effective, cheap ice-resisting and strengthening reconstruction and job practices to existing electric power pylon.
Ice-resisting and strengthening that is used for existing power transmission tower and job practices that the present invention proposes, its step comprise to be estimated the anti-ice performance of existing iron tower, sets up the tabula face according to estimating the appropriate location of supporting in the body of the tower middle and lower part, to strengthen the integral rigidity of electric power pylon; In addition, also at different turriforms, the weak easily unstability rod member of tower head and cross-arm place of electric power pylon is reinforced.
The anti-ice performance safety evaluatio of existing electric power pylon is according to certain standard and method (ready-made method is arranged), calculates the rigidity situation of electric power pylon, and whether according to calculating, it is reasonable at first will to estimate its tabula face setting, and whether globality meets the demands.
For the tabula face very few iron tower structure is set, need carries out the strengthening reconstruction design, mainly undertaken by setting up the tabula face to it.The diaphragm face set up the place, plan-position that four one-levels that the position is positioned at the body of the tower sections support intersection points, the tabula face of setting up itself must be that a geometry unchanged body transmits horizontal shear to reach whole, rationalizes the effect of distributing shearing.The design of geometry unchanged body can be with reference to existing related specifications.The cross-sectional sizes that the existing rod member in tabula face place can be set as required of choosing of tabula face is carried out standardized designs, and its form as shown in Figure 3.Because tabula face geometry itself is constant, it can support the one-level on four planes of body of the tower integral body of formation constrained each other, avoids the one-level support node that big deformity out of plane takes place; In this simultaneously, the outer direction of face that is supported on the tabula face also plays the effect of supporting the tabula face, avoids the tabula face that distortion and vertical motion outside the excessive face take place outside face.Between diaphragm face and one-level support two mutually near plane orthogonal in constraint mutually, support each other, formed the integral body of a common holding capacity.
In order to satisfy the integral rigidity requirement, after body of the tower has been set up the diaphragm face, because the original little support of having removed tabula face annex, make that the length of intersection point that one-level supports and the diaphragm surface member between the body of the tower master material is excessive, unstability takes place than excessive in long thin (directly) easily.Therefore need set up some little diagonal braces, these diagonal braces are different with the direction of original diagonal brace.These little diagonal brace one ends are supported on the quartile of diaphragm face, an other end be connected with diagonal brace or main material (as accompanying drawing 2).
Find by a large amount of computational analysiss and test: after suitably increasing the tabula face, the overall performance of structure can be greatly improved, the local vibration shape at body of the tower diagonal brace position disappears, and the face outer displacement of tower section diagonal brace can significantly be reduced, and has reduced the possibility of the outer unstability of face.Setting up this transformation reinforcement means of tabula face is very effective for strengthening the anti-ice of electric power pylon performance.
The existence of tabula face makes the anti-ice of electric power pylon lower middle portion body of the tower performance obtain very significantly strengthening.For the tower head of directly bearing ground wire and conductor load and cross-arm, according to the difference of turriform, unstable failure takes place owing to stressed bigger in tower head and some rod member of cross-arm place easily under ice load.Therefore need take to set up reinforcement measures such as diagonal brace or increase bar cross section size to these rod members.
Two reinforcement measures that the present invention proposes, full-scope safeguards integral rigidity, torsional property and the local strength of power transmission tower integral body from the tower head to the body of the tower, make electric power pylon can bear bigger icing load and be unlikely to lose bearing capacity.The present invention designs uniqueness, and construction is simple, and effect is remarkable, and the anti-ice that can be widely used in existing electric power pylon is transformed in the stabilization works.
Description of drawings
The structure chart of Fig. 1 electric power pylon.
Fig. 2 tabula is provided with the position diagram.
Fig. 3 tabula face form schematic diagram.Wherein, (a) being matrix pattern, (b) for matrix pattern adds diagonal brace, is that double-deck square frame shape adds the diagonal brace between bilayer (c).
Iron tower schematic diagram when Fig. 4 does not set up little support.
Fig. 5 sets up little support back iron tower schematic diagram.
Number in the figure: 1,2 is the cross section that needs reinforcement, and 3 is the little diagonal brace adjacent with cross section, and 4 for adding the position of little diagonal brace, and 5 is cross section member, and 6 is tower head, and 7 is cross-arm, and 8 is body of the tower.
The specific embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further details.
Electric power pylon for the area that is subject to the icing influence needs reinforcement and transforms at first carries out structural analysis to it and determines to increase the tabula face in what position.For body of the tower structure as shown in Figure 2, computational analysis show 1,2 promptly two one-levels place, plan-position of supporting infalls increase the deformity out of plane that the tabula face can suppress the local vibration shape and obviously reduce to support.To choosing of these two position tabula faces,, choose as the form in the accompanying drawing 3 according to the size of tabula face size.Because each rod member is stressed all less in the tabula face, the existence of tabula face mainly is for the control structure globality, so the selection of diagonal angle steel dimensions do not need to calculate, only need to satisfy structure requires and design discipline in for the control requirement of rod member slenderness ratio.
According to the drawing of existing iron tower, obtain the size in cross section 1,2.According to the size in cross section 1,2, choose the form of rational tabula face.Simultaneously, consider the construction requirement of tabula face, the little diagonal brace adjacent with the tabula face (as in the accompanying drawing 2 3) need be removed, tower after the dismounting as shown in Figure 4, the length of removing the later tabula surface member 5 of little support as seen from Figure 4 is long, easy unstability, therefore need to increase some little diagonal brace positions shown in the accompanying drawing 54, one end is supported on the quartile of diaphragm face, an other end is connected with diagonal brace or main material, like this can be so that the common coordinative role of tabula face and diagonal brace, globality is stronger, and reduces the calculated length of diagonal brace.The cross section selection principle of little diagonal brace, only needs to satisfy and constructs requirement by long thin (directly) ratio control with tabula face situation.Choose and to transfer to processing factory's blanking after the member section size of tabula face and improved little diagonal brace and make.The monolateral connection of bolt is all adopted in all connections, accomplishes fluently screw in processing factory, only need carry out assembly unit at the construction field (site), is easy to site operation, and is simple.
Sequence of construction need be strictly observed during tabula face site operation, and certain meteorological condition need be satisfied.Can make that the calculated length of main material and one-level diagonal brace increases, the flexing load reduces owing to remove original secondary diagonal brace, thus this work must under little landscape condition, carry out (force 3 wind below) and while can only to four faces of body of the tower one by one face operate; After removing original secondary diagonal brace, begin to install the member (as member 5 in the accompanying drawing 4) that the tabula face connects the body of the tower one side; Improved secondary diagonal brace is installed afterwards, and the link position of secondary diagonal brace and body of the tower can be used the left screw of having removed of diagonal brace; After the member transformation for the treatment of four faces of body of the tower installs, carry out the installation of other members of tabula face again.All bolted construction qualities need meet the regulation in the existing delivery receiving acceptance rules.When tabula face strengthening reconstruction need be carried out in the position that has two or more one-levels to support with one side, must construct successively from top to bottom, can not construct simultaneously to two positions.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101218848A CN101781937B (en) | 2010-03-11 | 2010-03-11 | Anti-icing Retrofit Method of Existing Transmission Tower |
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| CN2010101218848A CN101781937B (en) | 2010-03-11 | 2010-03-11 | Anti-icing Retrofit Method of Existing Transmission Tower |
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| CN101781937A true CN101781937A (en) | 2010-07-21 |
| CN101781937B CN101781937B (en) | 2011-05-25 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102535874A (en) * | 2012-01-11 | 2012-07-04 | 同济大学 | Wind resistance and reinforcement transformation method of high-voltage and superhigh-voltage power transmission line iron tower |
| CN102767293A (en) * | 2012-08-07 | 2012-11-07 | 广东电网公司佛山供电局 | Strengthening method for power transmission tower on hazardous area of landslide |
| CN104746894A (en) * | 2015-03-27 | 2015-07-01 | 中冶天工上海十三冶建设有限公司 | Modularized detaching construction method for large air separator cold box |
| CN105389436A (en) * | 2015-11-16 | 2016-03-09 | 国网山东省电力公司电力科学研究院 | Charged reinforcing and strengthening method for power transmission tower |
| CN105952239A (en) * | 2016-06-21 | 2016-09-21 | 山东大学 | Reinforcement device for preventing flexural-torsional buckling of angle steel for iron towers |
| CN113032878A (en) * | 2021-03-24 | 2021-06-25 | 贵州电网有限责任公司 | Anti-icing and disaster-reducing design method capable of repairing iron tower |
| CN113982358A (en) * | 2021-11-09 | 2022-01-28 | 贵州电网有限责任公司 | Improvement method for improving icing torsional rigidity of clamp type old line iron tower |
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| DE4435489A1 (en) * | 1994-10-04 | 1996-04-11 | Abb Patent Gmbh | Exchange of main diagonal strut of power-line pylon using auxiliary girder |
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| CN101463667A (en) * | 2009-01-16 | 2009-06-24 | 天津市电力公司 | Reinforcing means for power transmission iron tower |
| CN201362979Y (en) * | 2009-01-16 | 2009-12-16 | 天津市电力公司 | Reinforcing structure for power transmission iron tower |
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2010
- 2010-03-11 CN CN2010101218848A patent/CN101781937B/en not_active Expired - Fee Related
Patent Citations (6)
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| DE4435489A1 (en) * | 1994-10-04 | 1996-04-11 | Abb Patent Gmbh | Exchange of main diagonal strut of power-line pylon using auxiliary girder |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102535874A (en) * | 2012-01-11 | 2012-07-04 | 同济大学 | Wind resistance and reinforcement transformation method of high-voltage and superhigh-voltage power transmission line iron tower |
| CN102767293A (en) * | 2012-08-07 | 2012-11-07 | 广东电网公司佛山供电局 | Strengthening method for power transmission tower on hazardous area of landslide |
| CN104746894A (en) * | 2015-03-27 | 2015-07-01 | 中冶天工上海十三冶建设有限公司 | Modularized detaching construction method for large air separator cold box |
| CN105389436A (en) * | 2015-11-16 | 2016-03-09 | 国网山东省电力公司电力科学研究院 | Charged reinforcing and strengthening method for power transmission tower |
| CN105389436B (en) * | 2015-11-16 | 2018-08-17 | 国网山东省电力公司电力科学研究院 | A kind of power transmission tower electrification reinforcement and strengthening method |
| CN105952239A (en) * | 2016-06-21 | 2016-09-21 | 山东大学 | Reinforcement device for preventing flexural-torsional buckling of angle steel for iron towers |
| CN105952239B (en) * | 2016-06-21 | 2018-01-09 | 山东大学 | The anti-bending unstability bracing means of steel tower corner iron |
| CN113032878A (en) * | 2021-03-24 | 2021-06-25 | 贵州电网有限责任公司 | Anti-icing and disaster-reducing design method capable of repairing iron tower |
| CN113982358A (en) * | 2021-11-09 | 2022-01-28 | 贵州电网有限责任公司 | Improvement method for improving icing torsional rigidity of clamp type old line iron tower |
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| CN101781937B (en) | 2011-05-25 |
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