CN113833300A - Maintenance method for power transmission tower - Google Patents
Maintenance method for power transmission tower Download PDFInfo
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- CN113833300A CN113833300A CN202111094032.9A CN202111094032A CN113833300A CN 113833300 A CN113833300 A CN 113833300A CN 202111094032 A CN202111094032 A CN 202111094032A CN 113833300 A CN113833300 A CN 113833300A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/20—Side-supporting means therefor, e.g. using guy ropes or struts
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/24—Cross arms
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- Civil Engineering (AREA)
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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Working Measures On Existing Buildindgs (AREA)
- Electric Cable Installation (AREA)
Abstract
The invention discloses a power transmission tower maintenance method, and relates to the technical field of power equipment maintenance. The method comprises the steps of sequentially removing spacers of a tower to be maintained, and arranging temporary reinforcing pull lines at the middle-layer cross arm main material and the lower cross arm bottom main material of the tower to be maintained and adjacent towers of the tower to be maintained; hanging pulleys on adjacent towers, respectively arranging ground wires in sliding grooves of the pulleys, and installing passing wheel adjacent anchors of the adjacent towers; sequentially lowering the ground conducting wires to the lowest point through the main material and the pulley of the tower to be maintained, fixing the ground conducting wires on the main material of the tower body of the tower to be maintained, and dismantling the tower material of the section of the tower to be maintained, which needs to be maintained; and assembling new tower materials for the tower to be maintained in the maintenance section to complete maintenance. The invention can realize the quick replacement of the tower material of the power transmission tower without replacing the ground wire, ensures the power supply reliability of the line, avoids various huge losses caused by overlong power failure of the line, only replaces part of the tower material, avoids the problems of overhigh cost, overlong time and the like of the whole replacement of the power transmission tower, and is convenient to eliminate the shortage of potential safety hazards in time.
Description
Technical Field
The invention relates to the technical field of power equipment maintenance, in particular to a power transmission tower maintenance method.
Background
The transmission tower is an important component in a transmission line and mainly comprises a quadrangular pyramid-shaped tower-shaped structure formed by angle steel assembly welding. Due to the change of geological conditions and the foundation of the iron tower, the inclination of the power transmission tower can be caused, and great potential safety hazards are brought to the safety of the power transmission line. The deformation of the tower material of the power transmission tower can cause the inclination of the tower caused by uneven stress, and the conditions of seriously influencing the safe operation of the line, such as tower collapse, line breakage, electric network paralysis and the like exist. However, the weight of the power transmission tower is large, and the tower is connected with a high-voltage power transmission line, so that great difficulty is brought to the inclination correction work of the power transmission line iron tower, and how to quickly maintain the deformed tower material of the power transmission tower becomes one of the difficulties in eliminating the safety of the power transmission line.
Disclosure of Invention
The invention aims to provide a power transmission tower maintenance method, which can realize the quick replacement of tower materials of a power transmission tower without replacing a ground wire.
In order to achieve the purpose, the invention provides a maintenance method of a power transmission tower, which comprises the following steps:
sequentially removing the spacers from the small-size side to the large-size side of the tower to be maintained, and arranging temporary reinforcing pull lines at the middle-layer cross arm main material and the lower cross arm bottom main material of the tower to be maintained and adjacent towers of the tower to be maintained;
hanging a pulley on the adjacent tower, respectively arranging the ground wires in the sliding grooves of the pulleys, and installing a passing wheel adjacent anchor of the adjacent tower;
sequentially lowering the ground conducting wire phase to the lowest point through the main material of the tower to be maintained and the pulley, fixing the ground conducting wire phase on the main material of the tower body of the tower to be maintained, and dismantling the tower material of the section of the tower to be maintained, which needs to be maintained;
and assembling new tower materials for the tower to be maintained in the maintenance section to complete maintenance.
Preferably, the pulley is hung on the adjacent tower, the ground wires are respectively stored in the sliding grooves of the pulley, and the passing wheel adjacent anchor of the adjacent tower is installed, further comprising:
before the ground wires are respectively returned to the sliding grooves of the pulley, the load of the ground wires is unloaded;
loosening the line according to the sequence of the lower phase of the line A, the middle phase of the line A, the lower phase of the line B, the upper phase of the line A, the middle phase of the line B, the upper phase of the line B, the optical cable and the ground wire;
and after the spacing rod and the shockproof hammer of the ground wire are removed, the ground wire is lifted and placed into the sliding groove of the pulley.
Preferably, the grounding wire phase splitting is sequentially lowered to the lowest point through the main material of the tower to be maintained and the pulley, and is fixed on the main material of the tower body of the tower to be maintained, and the tower material of the section of the tower to be maintained, which needs to be maintained, is dismantled, and the method further comprises the following steps:
after the hanging point is removed, slowly releasing the ground wire until no tension exists;
fixing the ground wire on a main material of the tower to be maintained, and removing a ground wire hardware fitting and an insulator string;
and encapsulating and sealing the three-phase lead in the root opening range of the maintenance tower.
Preferably, the encapsulating and sealing the three-phase lead of the root opening range of the maintenance tower further comprises:
adopting a water pipe cut with the inner diameter of more than or equal to 30mm, the thickness of more than or equal to 2.5mm and the length of 1.5m to 2.5m to encapsulate the three-phase lead;
and sealing the three-phase lead which is wrapped by the adhesive tape in a spiral winding way.
Preferably, the grounding wire phase splitting is sequentially lowered to the lowest point through the main material of the tower to be maintained and the pulley, and is fixed on the main material of the tower body of the tower to be maintained, and the tower material of the section of the tower to be maintained, which needs to be maintained, is dismantled, and the method further comprises the following steps:
adopting a pole holding decomposition and column dismantling technology to dismantle tower materials of a section to be maintained of the tower to be maintained;
lifting the holding pole to the tower head of the tower to be maintained, and fixing a temporary holding pole pull wire;
and (4) dismantling the ground wire support and the wire cross arm in a fragmentation or segmentation manner.
Preferably, the dismantling of the ground wire bracket and the wire cross arm in segments or sections further includes: and the derrick supports a hoisting tackle, and is hoisted by using a steel wire rope, so that the normally dismantled angle iron is stressed, the bolt on the angle iron is loosened, and the steel wire rope is loosened to place the angle iron on the ground.
Preferably, the dismantling of the ground wire bracket and the wire cross arm in segments or sections further includes: the main material with the weight of more than 300 kilograms is removed by using a winching mill as power.
Preferably, the dismantling of the ground wire bracket and the wire cross arm in segments or sections further includes: the tower material is disassembled from top to bottom.
Preferably, for the tower that waits to maintain needs maintenance section assemblage new tower material, accomplish the maintenance, still include: dividing the section needing maintenance into an upper section and a lower section; the tower materials of the upper section are assembled from bottom to top, and the tower materials of the lower section are assembled from top to bottom.
Preferably, for the tower that waits to maintain needs maintenance section assemblage new tower material, accomplish the maintenance, still include: and in the process of assembling a new tower material, the installation position of the ground wire is kept, and the sag of the ground wire is adjusted.
The maintenance method of the power transmission tower comprises the steps of sequentially removing the spacers from the small-size side to the large-size side of the tower to be maintained, and arranging temporary reinforcing pull wires at the middle-layer cross arm main material and the lower cross arm bottom main material of the tower to be maintained and adjacent towers of the tower to be maintained; hanging a pulley on the adjacent tower, respectively arranging the ground wires in the sliding grooves of the pulleys, and installing a passing wheel adjacent anchor of the adjacent tower; sequentially lowering the ground conducting wire phase to the lowest point through the main material of the tower to be maintained and the pulley, fixing the ground conducting wire phase on the main material of the tower body of the tower to be maintained, and dismantling the tower material of the section of the tower to be maintained, which needs to be maintained; and assembling new tower materials for the tower to be maintained in the maintenance section to complete maintenance. The invention can realize the quick replacement of the tower material of the power transmission tower without replacing the ground wire, ensures the power supply reliability of the line, avoids various huge losses caused by overlong power failure of the line, only replaces part of the tower material, avoids the problems of overhigh cost, overlong time and the like of the whole replacement of the power transmission tower, and is convenient to eliminate the shortage of potential safety hazards in time.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for maintaining a double-loop terminal tower of a power transmission line according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a method for maintaining a transmission tower according to an embodiment of the present invention. The maintenance method of the power transmission tower provided by the embodiment comprises the following steps:
s110, the spacing rods from the small-size side to the large-size side of the tower to be maintained are sequentially removed, and temporary reinforcing pull wires are arranged at the middle-layer cross arm main material and the lower cross arm bottom main material of the tower to be maintained and adjacent towers of the tower to be maintained. Generally, the numbers 1, 2 and 3 are from the power supply end to the power receiving end. The large-size side is the gear of the tower facing the power receiving end, and the small-size side is opposite. The temporary reinforcing stay wire mainly has the function of balancing the tension of the overhead wire after the unilateral hanging of the wire, so that the tension-resistant rod keeps balance and stability during tightening, and the rod breakage accident can occur if the temporary stay wire is not used during tightening.
S120, hanging pulleys on adjacent towers, enabling the ground wires to be respectively arranged in sliding grooves of the pulleys, and installing passing wheel adjacent anchors of the adjacent towers.
Step S120 further includes: before the ground wires are respectively returned to the sliding grooves of the pulley, the load of the ground wires is unloaded; loosening the line according to the sequence of the lower phase of the line A, the middle phase of the line A, the lower phase of the line B, the upper phase of the line A, the middle phase of the line B, the upper phase of the line B, the optical cable and the ground wire; after the spacing rod and the shockproof hammer of the ground wire are removed, the ground wire is lifted and placed into the sliding groove of the pulley.
And S130, sequentially lowering the ground conducting wires to the lowest point through the main material and the pulley of the tower to be maintained, fixing the ground conducting wires on the main material of the tower body of the tower to be maintained, and dismantling the tower material of the section of the tower to be maintained, which needs to be maintained.
Step S130 further includes: after the hanging point is removed, slowly releasing the ground wire until no tension exists; fixing the ground wire on a main material of the tower to be maintained, and removing a ground wire hardware fitting and an insulator string; and encapsulating and sealing the three-phase lead in the root opening range of the maintenance tower. In order to achieve a better encapsulation sealing effect, a water pipe cut with the inner diameter of more than or equal to 30mm, the thickness of more than or equal to 2.5mm and the length of 1.5-2.5 m is adopted to encapsulate the three-phase lead; and sealing the three-phase lead wrapped by the adhesive tape in a spiral winding manner.
Further, step S130 further includes: adopting a pole holding decomposition and column dismantling technology to dismantle tower materials of a section to be maintained of the tower to be maintained; lifting the holding pole to the tower head of the tower to be maintained, and fixing the temporary holding pole pull wire; and (4) dismantling the ground wire support and the wire cross arm in a fragmentation or segmentation manner. In the dismantling process, a hoisting tackle is hung on the holding pole in a jacking mode, a steel wire rope is used for hoisting, the normally dismantled angle iron is stressed, the bolt on the angle iron is loosened, and the steel wire rope is loosened to enable the angle iron to be placed on the ground. And the main material with the weight of more than 300 kilograms is removed by using a winching as power. In order to perform the dismantling work more safely and effectively, the tower material should be dismantled from top to bottom.
And S140, assembling new tower materials for the section of the tower to be maintained, which needs to be maintained, and completing maintenance.
In order to perform assembly work more safely and effectively, the maintenance section is divided into an upper section and a lower section; the tower material of the upper section is assembled from bottom to top, and the tower material of the lower section is assembled from top to bottom. And in the process of assembling a new tower material, the installation position of the lead is kept, and the sag of the lead is adjusted.
In a specific embodiment, the 1 st to 11 th sections of tower material of a certain tower of a certain line of 500kV are replaced as an example; the load of the ground wire is firstly unloaded without replacing the ground wire, and the tower material is replaced and then reset. An SZG373-46/49/54 type angle steel straight-line tower is used for a certain tower of a certain 500kV line, legs are 54-0, 54-5 and 54-8I, III and IV, the height of the whole tower is 83 m, and the total weight is 54.5175 tons; the tower materials in the 9 th, 10 th and 11 th sections are deformed due to historical legacy reasons, so that the tower body has quite high risk of potential safety operation hazards; the replacement and maintenance must be carried out on 1-11 sections of tower materials of a certain tower of a certain line of 500kV in combination with various objective necessary factors.
The field measurement data is as follows:
iron tower inclination
1. Down-line slope (side, to large side): the whole size is 160mm from top to bottom. (height of the observation tower was 63.2m, and the calculation allowance was 189 mm).
2. Horizontal line slant (right ): from top to bottom, the whole is 80mm to the right. (the height of the observation tower is 63.2m, and the calculation allowable value is 189 mm; the height of the 10 th section is 41m, and the calculation allowable value is 123 mm).
(II) inclination of insulator
1. Down-line slope (side): from top to bottom, 270mm large.
2. Horizontal run slope (front): measured from top to bottom, 15mm to the right.
(III) root opening and diagonal on-site measurement (mm) of each tower section are shown in the table
Table 1 example root opening and diagonal in-situ measurements of each tower section
The 14 th horizontal iron height difference is 987 g, 961 g and 962 g.
Height difference of high-low leg base (with 1 leg as standard, mm)
I, leg: h is 0; II, leg: h-20 (with 1 leg flat); III, leg: 5030 (design value 5000); and IV, legs: h is 8027 (design value 8000).
(V) half diagonal and half root of high-low leg foundation (mm)
I, leg: AO 9958 (design value 9957) and AA 7041 (design value 7040).
II, leg: BO 9933 (design value 9957), BB 7024 (design value 7040).
III, leg: CO 9217 (design value 9213) and CC 6517 (design value 6515).
And IV, legs: DO is 8763 (design 8768) and DD is 6196 (design 6200).
(VI) center pile offset: and 30mm to the right.
In addition, the statistics of the weight and length of each tower section in this embodiment are as follows:
TABLE 2 statistical table of the weight and length of each tower segment in this example
A certain tower is designed into a double loop, each phase comprises 24 ACSR-720/50 type aluminum-clad steel core aluminum stranded wires, the unit weight is 2397.7kg/km, the total weight is 60594.7kg, the vertical load is 594.230kN, the horizontal load is 61.679kN, and the comprehensive load is 597.422 kN.
The specific maintenance steps of this embodiment are as follows:
1. the spacers from the small-size side to the large-size side of the tower are sequentially removed, the adjacent iron towers are provided with temporary reinforcing pull wires, and temporary pull wires are arranged at the main materials of the middle-layer cross arm and the bottom main material of the lower cross arm of the N161 tower.
2. And (3) dismantling the accessories of the adjacent towers, hanging a single-wheel pulley and a five-wheel pulley, respectively returning the ground wires into the sliding grooves, and installing the over-wheel adjacent anchors of the adjacent tower positions.
3. The main material is used for carrying out split-phase loosening on the lead to the lowest point by using a single-wheel pulley, the lead is fixed on the main material of the tower body below 11 sections, and the tower materials of the 1 st to 11 th sections are dismantled.
In order to ensure the stress balance, temporary stay wires are arranged at the middle-layer cross arm main material and the lower cross arm bottom main material of the tower B line before load shedding.
1) Load of unloading ground wire
And (3) loosening the thread: a lower phase line A, a middle phase line A, a lower phase line B, an upper phase line A, a middle phase line B, an upper phase line B, an OPGW optical cable and a ground wire; firstly, the spacing rods and the shockproof hammers of the ground wires are removed, and then the ground wires are lifted and placed into the five-wheel pulley. The hanging point is removed by using a motorized winching machine, the earth wire is slowly loosened until no tension exists, then the earth wire is fixed on the main material of the iron tower below the 11 th section (the middle phase conductor and the lower phase conductor are fixed on the 14 th section, and the upper phase conductor, the earth wire and the OPGW optical cable are fixed on the 12 th section, based on the actual situation), the dead head of the movable pulley can only be fixed on the tower body, and is forbidden to be hung on the holding pole. And (4) dismantling the ground wire hardware fittings and the insulator strings, and marking and orderly placing the ground wire hardware fittings and the insulator strings.
Because the ground wire is not replaced, in order to avoid the ground wire and the optical cable from being worn out by the tower material rope and the like, the ground wire and the optical cable are protected by the rubber tube with the opening. A water pipe with inner diameter of 30mm, thickness of more than 2.5mm and length of 2m and certain hardness and softness is used for cutting. And (3) encapsulating the three-phase lead (right below the cross arm) with the root open range, and then spirally winding and sealing the port by using an adhesive tape. When the component is hoisted, the distances between the hoisting piece, the rope and the tool and the ground wire and the optical cable are required to be paid attention, and the ground wire and the optical cable are not touched as much as possible.
2) Tower dismantling material
The tower is disassembled one by adopting a pole holding decomposition scheme. Lifting the 30m square holding pole to the tower head, driving the holding pole to temporarily pull a wire, and then carrying out fragmentation or segmentation removal on the ground wire support and the wire cross arm: A3T hoisting tackle is hung on the holding rod in a propping mode, a phi 15 steel wire rope is used for hoisting, the normally dismantled angle iron is stressed, bolts on the angle iron are loosened, the steel wire rope is manually pulled on the ground to be placed on the ground below the angle iron, and the operation process is opposite to tower assembling. For main materials with weight of more than 300 kg, winching is used as power to ensure safety. When the cross arm is disassembled, small materials on the upper side and the front side and the rear side of the cross arm are disassembled, and operators on the tower need to take double safety measures of safety belts and safety ropes.
After a layer of conducting wires are removed, the original iron tower cross arm and the original iron tower body component are removed from bottom to top, and the arrangement is neat.
4. Assembling 11-5 sections of new tower materials from bottom to top and assembling 1-4 sections of cross arms from top to bottom.
5. And when one layer of cross arm is installed, resetting the lead installation and adjusting the sag.
6. And (5) installing accessories. And loosening the over wheel adjacent anchor of the same-phase lead, and installing the line-to-line spacing rod.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for maintaining a transmission tower is characterized by comprising the following steps:
sequentially removing the spacers from the small-size side to the large-size side of the tower to be maintained, and arranging temporary reinforcing pull lines at the middle-layer cross arm main material and the lower cross arm bottom main material of the tower to be maintained and adjacent towers of the tower to be maintained;
hanging a pulley on the adjacent tower, respectively arranging the ground wires in the sliding grooves of the pulleys, and installing a passing wheel adjacent anchor of the adjacent tower;
sequentially lowering the ground conducting wire phase to the lowest point through the main material of the tower to be maintained and the pulley, fixing the ground conducting wire phase on the main material of the tower body of the tower to be maintained, and dismantling the tower material of the section of the tower to be maintained, which needs to be maintained;
and assembling new tower materials for the tower to be maintained in the maintenance section to complete maintenance.
2. The method for maintaining a power transmission tower according to claim 1, wherein the trolley is hung on the adjacent tower, the ground wires are respectively arranged in sliding grooves of the trolley, and the passing wheel adjacent anchor of the adjacent tower is installed, further comprising:
before the ground wires are respectively returned to the sliding grooves of the pulley, the load of the ground wires is unloaded;
loosening the line according to the sequence of the lower phase of the line A, the middle phase of the line A, the lower phase of the line B, the upper phase of the line A, the middle phase of the line B, the upper phase of the line B, the optical cable and the ground wire;
and after the spacing rod and the shockproof hammer of the ground wire are removed, the ground wire is lifted and placed into the sliding groove of the pulley.
3. The method for maintaining a power transmission tower according to claim 1, wherein the grounding wire is sequentially lowered to the lowest point through the main material of the tower to be maintained and the trolley, and is fixed on the main material of the tower body of the tower to be maintained, and the tower material of the section of the tower to be maintained, which needs to be maintained, is removed, further comprising:
after the hanging point is removed, slowly releasing the ground wire until no tension exists;
fixing the ground wire on a main material of the tower to be maintained, and removing a ground wire hardware fitting and an insulator string;
and encapsulating and sealing the three-phase lead in the root opening range of the maintenance tower.
4. The method of claim 3, wherein the step of over-sealing the open-bottomed three-phase conductor of the maintenance tower further comprises:
adopting a water pipe cut with the inner diameter of more than or equal to 30mm, the thickness of more than or equal to 2.5mm and the length of 1.5m to 2.5m to encapsulate the three-phase lead;
and sealing the three-phase lead which is wrapped by the adhesive tape in a spiral winding way.
5. The method for maintaining a power transmission tower according to claim 1, wherein the grounding wire is sequentially lowered to the lowest point through the main material of the tower to be maintained and the trolley, and is fixed on the main material of the tower body of the tower to be maintained, and the tower material of the section of the tower to be maintained, which needs to be maintained, is removed, further comprising:
adopting a pole holding decomposition and column dismantling technology to dismantle tower materials of a section to be maintained of the tower to be maintained;
lifting the holding pole to the tower head of the tower to be maintained, and fixing a temporary holding pole pull wire;
and (4) dismantling the ground wire support and the wire cross arm in a fragmentation or segmentation manner.
6. The method for maintaining a transmission tower according to claim 5, wherein the dismantling of the ground wire brackets and the wire crossarms in sections or segments further comprises: and the derrick supports a hoisting tackle, and is hoisted by using a steel wire rope, so that the normally dismantled angle iron is stressed, the bolt on the angle iron is loosened, and the steel wire rope is loosened to place the angle iron on the ground.
7. The method for maintaining a transmission tower according to claim 5, wherein the dismantling of the ground wire brackets and the wire crossarms in sections or segments further comprises: the main material with the weight of more than 300 kilograms is removed by using a winching mill as power.
8. The method for maintaining a transmission tower according to claim 5, wherein the dismantling of the ground wire brackets and the wire crossarms in sections or segments further comprises: the tower material is disassembled from top to bottom.
9. The method according to claim 1, wherein the assembling new tower material for the section of the tower to be repaired that needs to be repaired to complete the repair further comprises: dividing the section needing maintenance into an upper section and a lower section; the tower materials of the upper section are assembled from bottom to top, and the tower materials of the lower section are assembled from top to bottom.
10. The method according to claim 1, wherein the assembling new tower material for the section of the tower to be repaired that needs to be repaired to complete the repair further comprises: and in the process of assembling a new tower material, the installation position of the lead is kept, and the sag of the lead is adjusted.
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| CN202111094032.9A CN113833300B (en) | 2021-09-17 | 2021-09-17 | Maintenance method for power transmission tower |
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| CN202111094032.9A CN113833300B (en) | 2021-09-17 | 2021-09-17 | Maintenance method for power transmission tower |
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| JP2012251318A (en) * | 2011-06-01 | 2012-12-20 | Chugoku Electric Power Co Inc:The | Maintenance method of crossarm of steel tower |
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2021
- 2021-09-17 CN CN202111094032.9A patent/CN113833300B/en active Active
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|---|---|---|---|---|
| DE19946060A1 (en) * | 1999-09-25 | 2001-04-26 | Abb Patent Gmbh | Method and device for raising and / or restoring masts |
| CN102185265A (en) * | 2011-05-13 | 2011-09-14 | 四川省电力公司绵阳电业局 | Construction method for replacing cross arm of 35kV line linear rod |
| JP2012251318A (en) * | 2011-06-01 | 2012-12-20 | Chugoku Electric Power Co Inc:The | Maintenance method of crossarm of steel tower |
| CN111355187A (en) * | 2020-04-10 | 2020-06-30 | 浙江省送变电工程有限公司 | Method for replacing ground wire by crossing high-speed rail by using old lead net sealing |
| CN112582938A (en) * | 2020-11-12 | 2021-03-30 | 国核电力规划设计研究院有限公司 | Overhead ground wire replacing method |
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| 金连勇: "更换ZV塔损坏导地线横担施工方法", 《吉林电力》 * |
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