CN112421532A - Installation method of million-volt dry-type wall bushing - Google Patents
Installation method of million-volt dry-type wall bushing Download PDFInfo
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- CN112421532A CN112421532A CN202011241816.5A CN202011241816A CN112421532A CN 112421532 A CN112421532 A CN 112421532A CN 202011241816 A CN202011241816 A CN 202011241816A CN 112421532 A CN112421532 A CN 112421532A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/22—Installations of cables or lines through walls, floors or ceilings, e.g. into buildings
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Abstract
The invention relates to a method for installing a million-volt dry-type wall bushing, which comprises the working procedures of fixing a wall bushing by using a bushing installation tool, hoisting the million-volt dry-type wall bushing, aligning a flange and the wall bushing, fixing a nut and the like. The invention utilizes various mounting tools to realize the fixing of the wall bushing wall-penetrating plate, the hoisting of the million volt dry-type wall bushing, the hole alignment of the flange and the wall bushing plate, the fixation of the nut and the like, greatly reduces the mounting difficulty of the high-altitude wall bushing and improves the hole alignment accuracy of the wall bushing flange and the wall bushing plate.
Description
Technical Field
The invention belongs to the technical field of electric power engineering, and particularly relates to a method for installing a megavolt dry-type wall bushing.
Technical Field
The wall bushing, as a current-carrying conductor, penetrates through a wall body with a potential different from that of the current-carrying conductor, and introduces or draws full voltage and full current, so that the wall bushing plays a role in insulation and mechanical support, integrates the performances of current collection, heat, force, chemistry and the like, and is one of key devices for developing a power transmission system and ensuring the safe and stable operation of the system. At present, the wall bushing is installed in a manual hoisting mode, the weight of the wall bushing with a high voltage grade, especially the wall bushing with a million-volt voltage grade, can reach 20-30 t, the installation height can reach more than 20m, the installation difficulty of the wall bushing with the million-volt voltage is greatly increased, and especially the angle control difficulty of the wall bushing in the hoisting process is high.
Disclosure of Invention
The invention aims to solve the technical problems and provides a method for installing a megavolt dry-type wall bushing, which has the characteristics of high installation efficiency and good accuracy.
In order to achieve the purpose, the invention designs a megavolt dry-type wall bushing installation method, which is characterized by comprising the following steps:
step 1: before the wall penetrating plate is installed, fixing a wall penetrating hole embedded part in a wall body, wherein the wall penetrating hole embedded part is used for fixing the wall penetrating plate, the wall body is used for supporting a wall penetrating sleeve, one side of the wall body is a synthesis hall, the other side of the wall body is a vibration hall, and a sunken wall body part in the wall penetrating hole embedded part is flatly cushioned by a steel plate and fixed in the wall body;
step 2: the wall penetrating plate is fixed in the installation wall body, wherein the wall penetrating plate is composed of a large wall penetrating plate positioned in the synthesis hall and a small wall penetrating plate positioned in the oscillation hall, the axial directions of the large wall penetrating plate and the small wall penetrating plate are ensured to be vertical to the wall body, and the radial directions of the large wall penetrating plate and the small wall penetrating plate are parallel to the wall body;
and step 3: before the wall bushing is hoisted, the wall bushing is adjusted to be axially vertical to the installation wall body, the wall bushing is adjusted to ensure that a large flange installation hole of the wall bushing is aligned with an installation hole on a large wall bushing, and meanwhile, a small flange installation hole of the wall bushing is aligned with an installation hole on a small wall bushing;
and 4, step 4: a hoisting tool is fixed on a flange of the wall bushing to ensure that the wall bushing is kept in a horizontal state in the hoisting process;
and 5: the wall bushing enters the large wall bushing from the synthesis hall, and is moved from the small wall bushing to the vibration hall, the angle of the wall bushing is adjusted, gaps are kept between the wall bushing and the large wall bushing and between the wall bushing and the small wall bushing until the wall bushing is safely positioned, the large flange plate and the large wall bushing are fixedly connected through nuts and bolts, and the small flange plate and the small wall bushing are fixedly connected;
step 6: and after the wall bushing is installed in place, the hoisting tool is safely dismantled.
The installation process provided by the invention is simple and convenient to operate, the proper tools are used during installation and hoisting of the wall bushing, the practicability is high, the hole aligning accuracy of the flange of the extra-high voltage dry type wall bushing and the wall bushing is improved, the installation period of the extra-high voltage dry type wall bushing is shortened, and a new method is provided for installation of the extra-high voltage dry type wall bushing.
Drawings
FIG. 1 is a schematic illustration of the present invention in a hoist configuration;
FIG. 2 is a schematic view of an embedded part in a through-wall opening according to the present invention;
FIG. 3 is a schematic view of the installation of the wall bushing of the present invention;
FIG. 4 is a schematic view of a casing hoisting tool according to the present invention.
The wall-penetrating type wall-penetrating device comprises a wall-penetrating plate 1, a large wall-penetrating plate 1.1, a small wall-penetrating plate 1.2, a wall-penetrating hole embedded part 2, a sunken wall part 2.1, a wall body 3, a wall-penetrating sleeve 4, a large flange plate 4.1, a small flange plate 4.2, a synthesis hall 5, a vibration hall 6, a hoisting tool 7 and a wall-penetrating hole 8.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
the installation method of the megavolt dry-type wall bushing shown in fig. 1 to 4 comprises the following steps:
step 1: before the wall penetrating plate 1 is installed, a wall penetrating hole embedded part 2 is fixed in a wall body 3, the wall penetrating hole embedded part 2 is used for fixing the wall penetrating plate, the wall body 3 is used for supporting a wall penetrating sleeve 4, one side of the wall body 3 is a synthesis hall, the other side of the wall body 3 is a vibration hall, and a concave wall body part 2.1 in the wall penetrating hole embedded part 2 is flatly cushioned by a steel plate and fixed in the wall body 3;
step 2: the wall penetrating plate 1 is fixed in the installation wall body 3, wherein the wall penetrating plate 1 consists of a large wall penetrating plate 1.1 positioned in the synthesis hall 5 and a small wall penetrating plate 1.2 positioned in the oscillation hall 6, the positions of the wall penetrating plates are adjusted through a laser collimator and a level gauge, the axial directions of the large wall penetrating plate 1.1 and the small wall penetrating plate 1.2 are ensured to be vertical to the wall body 3, and the radial directions of the large wall penetrating plate 1.1 and the small wall penetrating plate 1.2 are parallel to the wall body 3;
and step 3: before the wall bushing 4 is hoisted, the wall bushing 4 is adjusted to be axially vertical to the installation wall body 3, the wall bushing 4 is adjusted through a laser collimator to ensure that a large flange installation hole of the wall bushing 4 is aligned with an installation hole on a large wall bushing 1.1, and meanwhile, a small flange installation hole of the wall bushing 4 is aligned with an installation hole on a small wall bushing 1.2;
and 4, step 4: a hoisting tool 7 is fixed on a flange of the wall bushing 4, and a balance weight at one end of the wall bushing 4 is adjusted through trial hoisting to ensure that the wall bushing 4 is kept in a horizontal state in the hoisting process;
and 5: the wall bushing 4 enters the large wall bushing 1.1 from the synthesis hall 5, and is adjusted from the small wall bushing 1.2 to the oscillation hall 6, the angle of the wall bushing 4 is adjusted, the wall bushing 4 is kept to have a gap with the large wall bushing 1.1 and the small wall bushing 1.2 until the wall bushing 4 is safely positioned, the large flange plate 4.1 and the large wall bushing 1.1 are fixedly connected through nut bolts, and the small flange plate 4.2 and the small wall bushing 1.2 are fixedly connected through nut bolts;
step 6: and after the wall bushing 4 is installed in place, the hoisting tool 7 is safely dismantled.
In step 2 of the above technical scheme, in order to ensure that a large wall penetrating plate 1.1 in a synthesis hall 5 and a small wall penetrating plate 1.2 in a vibration hall 6 can be respectively aligned with a synthesis hall side flange plate and a vibration hall side flange plate mounting hole of a wall penetrating sleeve 4, the wall penetrating sleeve 4 is simulated through a full-size and equal-proportion wall penetrating plate tool, the wall penetrating plate 1 is hoisted to a wall body 3 and mounted by adopting the wall penetrating plate tool, the large wall penetrating plate 1.1 is hoisted and horizontally placed into a wall penetrating hole 8 in the synthesis hall 5 by a crane (see fig. 2, the wall penetrating plate is welded and fixed in the wall penetrating hole), the position of the wall penetrating plate is corrected by a machine collimator and a level gauge, the gap between the periphery of the wall penetrating plate and the single side of the wall penetrating hole is 5mm, gaps are uniformly adjusted by metal plugs and are firmly spot-welded, and the perpendicularity and levelness of the wall.
In step 3 of the above technical scheme, in order to align the relative positions of the large flange mounting hole of the wall bushing 4 and the mounting hole on the large wall bushing 1.1 before the wall bushing 4 is hoisted, the wall bushing 4 is vertically placed behind the wall (a wall through hole is formed in the wall, the wall bushing is fixed in the wall through hole, and the large flange plate and the small flange plate of the bushing are fixedly connected), a laser collimator is used to project to two mounting holes on the large wall bushing 1.1, the laser projection line covering the mounting holes is used as a reference line, the position of the wall bushing 4 is adjusted, the mounting hole on the large wall bushing and the mounting hole on the large flange disk are found on the large flange mounting hole of the wall bushing 4, and the large flange mounting hole of the wall bushing 4 is ensured to be aligned with the mounting hole on the large wall bushing 1.1.
In the step 4 of the above technical scheme, after the wall bushing 4 is hung to the installation height by the crane, the wall bushing 4 needs to be horizontally inserted into the wall penetrating plate 1, the position of the crane is unchanged in the process, the wall bushing 4 is pushed by rotating the hanging arm, the motion track of the wall bushing 4 is an arc line (when the bushing is hung to the installation height, the motion state of the bushing is in the horizontal hanging process), the horizontal angle of the wall bushing 4 needs to be manually adjusted, the method is adopted that an operation platform near the wall bushing 4 is manually pulled, two pulling ropes are arranged at the end part of the bushing of the synthesis hall 5, the adjustment is assisted by ground workers, the horizontal state of the wall bushing 4 is ensured to be inserted into the wall penetrating plate 1, after the other end of the wall bushing 4 is inserted into the oscillation hall 6, the crane in the oscillation hall 6 is used to hang the end part of the wall bushing 4 at the side of the oscillation hall 6, the angle of the wall bushing 4 is assisted to be adjusted, not hitting the wall penetrating plate), the traveling crane moves horizontally along with the wall penetrating sleeve 4.
In step 5 of the above technical scheme, the crane is limited by the hook and the spatial position, and cannot completely position the wall bushing 4, at this time, 6 lead screws are adopted and pass through the mounting hole of the large wall bushing 1.1 and the mounting hole of the large flange, the corresponding screws on the large wall bushing 1.1 and the mounting hole of the large flange are screwed by nuts, and are adjusted one by one, the 6 screws with the length of 1m are utilized to pull the wall bushing 4 to safely position (limited by the mounting spatial position, the crane cannot completely feed the bushing into the mounting position (the large flange plate is contacted with the large wall bushing), at this time, the screws with the length of 1m are required to connect the large flange plate and the large wall bushing, and are gradually locked, and finally, the mounting hole of the large wall bushing 1.1 and the mounting hole of the small wall bushing 1.2 are ensured to be tightly connected with the mounting nuts and the fixing screws (after the large flange plate is fixed with the large wall bushing, the small through wall plate and the small flange are directly connected by bolts and nuts), then the 6 guide screws are dismantled, and the small through wall plate and the small flange are fixed by using the installation nuts and the bolts.
In this embodiment, a method for installing a million dry type wall bushing is described in detail according to a specific installation process of a million volt wall bushing.
1. Preparation work
(1) The scaffold is erected, in order to facilitate and safety construction, a novel disc scaffold is adopted in engineering, and operation platforms with the length of 12 meters, the width of 6 meters and the height of 26 meters are erected on the left side and the right side of the through-wall hole respectively. A pedal is fully paved above the operation platform, and a safety guardrail is arranged; and the embedded part sunken wall body part for welding the through wall plate is leveled by a steel plate pad and is firmly welded.
(2) The wall panel penetrating tool is manufactured, the wall panel penetrating tool is manufactured by a steel plate with the thickness delta being 10mm on the side of a synthesis hall and the side of an oscillation hall respectively, the flange phi 1844mm on the side of the synthesis hall and the flange phi 1524mm on the side of the oscillation hall are selected, and the flange phi 1744mm and the flange phi 1424mm on the side of the synthesis hall and the flange phi 1424mm on the side of the oscillation hall correspond to the hole diameters and the hole distances of the wall panel penetrating and the wall penetrating sleeve. The side mounting flange center of the synthetic hall of frock is the hollow, and diameter 800mm is concentric circles with the flange external diameter, as the installation hand hole, uses delta 10mm, phi 1524mm, L400 mm steel tube welding between two flanges, respectively welds two lugs in order to make things convenient for hoist and mount and dismantlement on the flange of both sides.
2. Through-wall panel mounting
(1) The total weight of the wall penetrating plate and the tool after assembly is about 5 tons, the wall penetrating plate is hung at a wall penetrating hole in a synthesis hall by a 130-ton truck crane, the wall penetrating plate is horizontally hung in the wall penetrating hole by a 130-ton crane in an oscillation hall, the position of the wall penetrating plate is aligned by a laser collimator and a level meter, a 10mm gap is uniformly divided from top to bottom and from left to right, a single-side gap is 5mm, the gap is uniformly adjusted by a metal plug block and is firmly spot-welded, and the perpendicularity and the levelness of the wall penetrating plate and the wall are ensured.
(2) Dismantling the connecting bolt of the tool and the wall penetrating plate, dismantling the wall penetrating plate tool by a crane in a synthesis hall, and installing rib plates on the inner sides of the two wall penetrating plates, fully welding and brushing anti-rust paint.
3. Wall bushing installation
(1) The wall bushing takes out the packing carton, hang a 10 tons chain block as the fine setting of sleeve pipe angle below the driving orbit of the synthetic hall, use 200t crane to hang the packing box with the sleeve pipe level, and fill up it with the sleeper, damage sleeve pipe surface paint when preventing to hoist, pile up the polyester felt at the inboard floor of synthetic hall sleeve pipe metal part, fill up the floor on with the batten with the sleeve pipe metal and level, for the ease of wall bushing passes through wall bushing center round hole, only install the equalizer ring of synthetic hall side sleeve pipe tip, wait that wall bushing flange and wall bushing are fixed after the installation vibrate the equalizer ring of hall side sleeve pipe tip.
(2) And (3) installing the manufactured hoisting tool on the metal part of the sleeve of the synthesis hall by using bolts, and trial hoisting and fastening the hoop fixing bolts by using the sleeve flange screw holes and the wall plate flange screw holes at the same angle.
(3) And locking a pair of lifting ropes with the length of 4 meters and the length of 40 tons on a lifting tool, wherein the distance between the lifting ropes and the center of the sleeve is about 800mm, adjusting the length of a balance weight pipe of the lifting tool, using a 10-ton chain block lock at the side close to a sleeve flange as an auxiliary sleeve for balance adjustment, and using a 10-ton chain block at the side of an oscillation hall as an auxiliary lifting point.
(4) And (3) trial hoisting, namely slowly hoisting the sleeve to a position 10cm away from the ground to be static, adjusting the lengths of the auxiliary chain block and the tool counterweight pipe to balance the sleeve, standing for about 20 minutes, observing whether the machinery and equipment are abnormal, simulating the hoisting process of the sleeve on the ground, standing for about 20 minutes to check whether the crane is abnormal, referring to a crane load reference table and having certain surplus hoisting capacity, tying a cable rope on the end of the sleeve to control the direction of the sleeve, and putting each person in place.
(5) The crane slowly and stably lifts the sleeve to the mounting height, personnel on a working platform stabilize the sleeve on two sides of the wall penetrating plate to prevent the sleeve from swinging, the elevation angle and the lifting height of the suspension arm are continuously adjusted, a certain distance is kept between the sleeve and the periphery of the wall penetrating plate hole, the sleeve penetrates into a station, when the metal part on the side of the sleeve oscillation hall is exposed on the side of the oscillation hall, the hand chain block on the side of the oscillation hall is used for replacing an auxiliary balance hand chain block on the crane by the hand chain block on the side of the oscillation hall, the auxiliary balance hand chain block is used for fine adjustment of the angle until the sleeve is in place, and the sleeve is fastened by mounting hand hole.
(6) And (3) removing the hoisting tool and the chain block after the sleeve is installed in place, adjusting the grading ring to the sleeve end on the side of the installation vibration hall by using a travelling crane in the vibration hall for installation, transacting a completion certification list after confirming that the installation is correct by all levels of relevant departments, removing the working platform, cleaning a construction site, and finishing the installation work of the wall bushing.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (5)
1. A method for installing a megavolt dry-type wall bushing is characterized by comprising the following steps:
step 1: before the wall penetrating plate (1) is installed, a wall penetrating hole embedded part (2) is fixed in a wall body (3), the wall penetrating hole embedded part (2) is used for fixing the wall penetrating plate, the wall body (3) is used for supporting a wall penetrating sleeve (4), one side of the wall body (3) is a synthesis hall, the other side of the wall body (3) is a vibration hall, and a concave wall body part (2.1) in the wall penetrating hole embedded part (2) is flatly cushioned by a steel plate and fixed in the wall body (3);
step 2: the wall penetrating plate (1) is fixed in the installation wall body (3), wherein the wall penetrating plate (1) consists of a large wall penetrating plate (1.1) positioned in a synthesis hall (5) and a small wall penetrating plate (1.2) positioned in a vibration hall (6), the axial directions of the large wall penetrating plate (1.1) and the small wall penetrating plate (1.2) are ensured to be vertical to the wall body (3), and the radial directions of the large wall penetrating plate (1.1) and the small wall penetrating plate (1.2) are parallel to the wall body (3);
and step 3: before the wall bushing (4) is hoisted, the wall bushing (4) is adjusted to be axially vertical to the installation wall body (3), the wall bushing (4) is adjusted to ensure that a large flange installation hole of the wall bushing (4) is aligned with an installation hole on a large wall bushing (1.1), and meanwhile, a small flange installation hole of the wall bushing (4) is aligned with an installation hole on a small wall bushing (1.2);
and 4, step 4: a hoisting tool (7) is fixed on a flange of the wall bushing (4) to ensure that the wall bushing (4) is kept in a horizontal state in the hoisting process;
and 5: the wall bushing (4) enters the large wall bushing (1.1) from the synthesis hall (5), and is connected and fixed with the small wall bushing (1.2) from the small wall bushing (1.2) to the oscillation hall (6) by adjusting the angle of the wall bushing (4) to keep the wall bushing (4) and the large wall bushing (1.1) and the small wall bushing (1.2) to have a gap until the wall bushing (4) is safely positioned, the large flange plate (4.1) and the large wall bushing (1.1) are connected and fixed by nuts and bolts, and the small flange plate (4.2) and the small wall bushing (1.2) are connected and fixed;
step 6: after the wall bushing (4) is installed in place, the hoisting tool (7) is safely dismantled.
2. The method of installing a megavolt dry wall bushing according to claim 1, wherein: in the step 2, in order to ensure that a large wall penetrating plate (1.1) in the synthesis hall (5) and a small wall penetrating plate (1.2) in the oscillation hall (6) can be respectively aligned with installation holes of a synthesis hall side flange plate and an oscillation hall side flange plate of the wall penetrating sleeve (4), the wall penetrating sleeve (4) is simulated through a full-size and equal-proportion wall penetrating plate tool, the wall penetrating plate (1) is hoisted to a wall body (3) and installed by adopting the wall penetrating plate tool, the large wall penetrating plate (1.1) is hoisted and horizontally placed into a wall penetrating hole (8) in the synthesis hall (5) by a crane, and the position of the wall penetrating plate is corrected by a machine collimator and a level gauge.
3. The method of installing a megavolt dry wall bushing according to claim 1, wherein: in the step 3, in order to align the relative positions of the large flange mounting holes of the wall bushing (4) and the mounting holes on the large wall bushing (1.1) before the wall bushing (4) is hoisted, after the wall bushing (4) is vertically placed on a wall body, a laser collimator is used for projecting to two mounting holes on the large wall bushing (1.1), a laser projection line covering the mounting holes is used as a reference line, the position of the wall bushing (4) is adjusted, the mounting holes on the large wall bushing and the mounting holes on the large flange disk are found on the large flange mounting holes of the wall bushing (4), and the large flange mounting holes of the wall bushing (4) are ensured to be aligned with the mounting holes on the large wall bushing (1.1).
4. The method of installing a megavolt dry wall bushing according to claim 1, wherein: in the step 4, the wall bushing (4) is lifted to the installation height by a crane and then horizontally enters the wall bushing (1), in the process, the position of the crane is unchanged, the wall bushing (4) is pushed by rotating the suspension arm, the motion track of the wall bushing (4) is an arc line, the horizontal angle of the wall bushing (4) needs to be manually adjusted, the adopted method is that an operation platform near the wall bushing (4) is manually pulled, two hauling ropes are arranged at the end part of the sleeve of the synthesis hall (5) and are adjusted by ground workers to ensure that the wall bushing (4) enters the wall bushing (1) in a horizontal state, after the other end of the wall bushing (4) enters the vibration hall (6), the end part of the wall bushing (4) at the side of the vibration hall (6) is hung by a travelling crane in the vibration hall (6) to assist in adjusting the angle of the wall bushing (4), and the travelling crane horizontally moves along with the wall bushing (4).
5. The method of installing a megavolt dry wall bushing according to claim 1, wherein: in the step 5, the crane is limited by a lifting hook and a space position, the wall bushing (4) cannot be completely inserted, at the moment, 6 guide screws are adopted and penetrate through the mounting hole of the large wall bushing (1.1) and the mounting hole of the large flange, the corresponding screws on the large wall bushing (1.1) and the mounting hole of the large flange are screwed by nuts and are adjusted one by one, the 6 screws with the length of 1m are utilized to pull the wall bushing (4) to be safely inserted, the mounting holes of the large wall bushing (1.1) and the mounting hole of the large flange, and other mounting holes of the small wall bushing (1.2) and the mounting hole of the small flange are fixed by mounting nuts and screws, then the 6 guide screws are removed, and the mounting nuts and the bolts are also used for fixing.
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| CN202011241816.5A CN112421532B (en) | 2020-11-09 | 2020-11-09 | Installation method of million-volt dry-type wall bushing |
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| CN202011241816.5A CN112421532B (en) | 2020-11-09 | 2020-11-09 | Installation method of million-volt dry-type wall bushing |
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| DE3122335A1 (en) * | 1981-06-05 | 1982-12-23 | Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart | Wall bushing for electrical cables |
| CN102909551A (en) * | 2012-10-30 | 2013-02-06 | 青岛宏大纺织机械有限责任公司 | Laser coordinate positioning device butt-jointed with transmission shafts of two-for-one twister |
| CN102980537A (en) * | 2012-11-16 | 2013-03-20 | 东方电气(广州)重型机器有限公司 | Installation method for frame open type heat exchanger and heat exchange tube and supporting bar |
| CN107227816A (en) * | 2017-07-28 | 2017-10-03 | 陕西建工第十建设集团有限公司 | A kind of wall bushing construction method based on wall bushing prefabricated section |
| CN108487621A (en) * | 2018-03-13 | 2018-09-04 | 常州钢构建设工程有限公司 | Assembled movement shield cage and its construction method |
| CN108565769A (en) * | 2018-03-27 | 2018-09-21 | 国家电网公司 | One kind ± 1100kV direct-current wall bushing installation and repairing methods |
| CN110690675A (en) * | 2019-09-11 | 2020-01-14 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Improve special high voltage wall bushing of anti-seismic performance |
| CN210239179U (en) * | 2019-06-12 | 2020-04-03 | 中铁一局集团电务工程有限公司 | Quick positioner of tuber pipe wall bushing |
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2020
- 2020-11-09 CN CN202011241816.5A patent/CN112421532B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3122335A1 (en) * | 1981-06-05 | 1982-12-23 | Dr.Ing.H.C. F. Porsche Ag, 7000 Stuttgart | Wall bushing for electrical cables |
| CN102909551A (en) * | 2012-10-30 | 2013-02-06 | 青岛宏大纺织机械有限责任公司 | Laser coordinate positioning device butt-jointed with transmission shafts of two-for-one twister |
| CN102980537A (en) * | 2012-11-16 | 2013-03-20 | 东方电气(广州)重型机器有限公司 | Installation method for frame open type heat exchanger and heat exchange tube and supporting bar |
| CN107227816A (en) * | 2017-07-28 | 2017-10-03 | 陕西建工第十建设集团有限公司 | A kind of wall bushing construction method based on wall bushing prefabricated section |
| CN108487621A (en) * | 2018-03-13 | 2018-09-04 | 常州钢构建设工程有限公司 | Assembled movement shield cage and its construction method |
| CN108565769A (en) * | 2018-03-27 | 2018-09-21 | 国家电网公司 | One kind ± 1100kV direct-current wall bushing installation and repairing methods |
| CN210239179U (en) * | 2019-06-12 | 2020-04-03 | 中铁一局集团电务工程有限公司 | Quick positioner of tuber pipe wall bushing |
| CN110690675A (en) * | 2019-09-11 | 2020-01-14 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Improve special high voltage wall bushing of anti-seismic performance |
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|---|---|
| CN112421532B (en) | 2021-11-23 |
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