CN113097951A - Method for hoisting vertical expansion joint of lower 500kVGIL pipeline bus - Google Patents
Method for hoisting vertical expansion joint of lower 500kVGIL pipeline bus Download PDFInfo
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- CN113097951A CN113097951A CN202110356450.4A CN202110356450A CN113097951A CN 113097951 A CN113097951 A CN 113097951A CN 202110356450 A CN202110356450 A CN 202110356450A CN 113097951 A CN113097951 A CN 113097951A
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- pipeline bus
- bus
- gil
- pipeline
- joint
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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
- H02G5/00—Installations of bus-bars
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
- B66C1/14—Slings with hooks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D3/00—Portable or mobile lifting or hauling appliances
- B66D3/12—Chain or like hand-operated tackles with or without power transmission gearing between operating member and lifting rope, chain or cable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D2700/00—Capstans, winches or hoists
- B66D2700/01—Winches, capstans or pivots
- B66D2700/0183—Details, e.g. winch drums, cooling, bearings, mounting, base structures, cable guiding or attachment of the cable to the drum
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Abstract
The invention relates to a method for hoisting a vertical telescopic joint of a lower 500kVGIL pipeline bus, which is used for dismounting or reinstalling typical difficult positions, wherein the typical difficult positions comprise the vertical telescopic joint of the lower 500kVGIL pipeline bus connected with an upper pipeline bus and a lower pipeline bus of the same loop, and the typical difficult positions comprise the insufficient safe distance with an adjacent charged body and the high-altitude overlapped part. According to the invention, only the lower GIL pipeline bus to be hoisted needs to be powered off, the power-off range does not need to be expanded, and the power supply reliability of the system is improved; the output load is increased; the potential safety hazard is small and few, the safety risk can be controlled, and the cross of the working face is few, so that the safety and civilized construction appearance can be ensured; the consumed time is short, the work is continuous, and the efficiency is high; and the device is free from interference caused by insufficient electrical safety distance.
Description
Technical Field
The invention relates to a method for hoisting a vertical telescopic joint of a pipeline bus, in particular to a method for hoisting a vertical telescopic joint of a lower 500kVGIL pipeline bus, and belongs to the field of electric power overhaul.
Background
500kV GIL pipeline bus is important equipment connected between a 500kV GIS and a 500kV outgoing line high-voltage bushing, the GIS and the GIL pipeline bus are matched, so that the occupied area, the overhaul (installation time), the equipment maintenance investment and the like are greatly saved, and the GIS and the GIL pipeline bus are obviously outstanding in advantages and widely applied to transformer substations and converter stations with voltage levels of 500kV and above. Considering such as in convenient maintenance, doing benefit to the extension, 500kV GIL pipeline generating line A, B, C three-phase all is that the level of lower floor is perpendicular arranges, simultaneously, in order to guarantee that the station is interior to be patrolled the passageway safe unobstructed, satisfy the electrical safety distance requirement, stride across the facility equipment barrier, bore crisscross live-line operation cable channel etc. of crossing, GIL pipeline generating line design height is fallen by mistake, liftoff about 1.5 ~ 8 meters inequality. Vertical expansion joints are used between the upper layer and the lower layer of the GIL pipeline bus of the same loop to absorb the change of the pipeline bus caused by the change of temperature difference and the like. The standard section is 12 meters in length, 0.6 meter in outer diameter and 1 ton in weight, the distance between the bus bars of the upper layer and the lower layer of the pipeline is about 500mm, and the horizontal distance between the bus bar shells of the GIL pipeline is about 300 mm. The weight of the vertical telescopic section of the GIL pipeline bus is about 500-600Kg, the minimum height difference between the upper layer pipeline bus and the lower layer pipeline bus is 500mm, the maximum height difference is 2700 mm, most of the lower part of the GIL pipeline bus is divided into a centimeter stone ground, particularly, live operation cable channels, cable trenches, equipment foundations and the like are arranged below the vertical telescopic section, and the vertical telescopic section of the GIL pipeline bus at the lower layer is usually arranged near a naked GIL outgoing line high-voltage sleeve. Due to the objective factors such as severe working environment and the like, machines such as cranes, platform trucks and the like cannot be used, and if the hoisting method is improper during dismantling or recovery, not only can potential safety hazards be brought to electrified running equipment, but also major equipment accidents can be caused. Therefore, the lower-layer GIL pipeline bus vertical expansion joint must be safely hoisted phase by phase in a scientific and reasonable mode.
At present, the maintenance work is usually carried out by a machine with smaller output load of a transformer substation or a converter station in a way of simultaneously powering off and maintaining upper and lower GIL pipeline buses. If the mode of power failure and maintenance is adopted, the device is wide in point, long in battle line, narrow in working surface and the like; the power failure range has to be enlarged, so that the system reliability is reduced, the load output is reduced, the potential safety hazard is large due to multiple crossed working faces, the safety and civilized construction appearance is poor, and the like.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for hoisting a vertical telescopic joint of a lower 500kVGIL pipeline bus, which can hoist the lower 500kVGIL pipeline bus under the condition that the 500kV upper GIL pipeline bus is in live operation, and is safe, reliable, labor-saving, time-saving and cost-saving.
The purpose of the invention is realized by the following technical scheme:
a method for hoisting a vertical expansion joint of a lower 500kVGIL pipeline bus is carried out as follows:
dismantling or reinstalling typical difficult positions, wherein the typical difficult positions comprise vertical expansion joints which are insufficient in safety distance with adjacent charged bodies and are connected with upper and lower platform pipeline buses of the same loop through lower 500kVGIL pipeline buses at the high-altitude overlapping parts;
the method comprises the following steps of for a ground overlapped part lower-layer intermediate phase GIL tubular bus:
step (1), when the gas in the related gas chamber SF6 is recovered and then is removed, a working platform is erected on the ground of the common mark stone in the conveying path, and a crossing frame is erected on a live-line operation cable channel below the vertical telescopic joint; paving a bamboo fiber board on the surface of a centimeter stone below a straight line section of a lower GIL tubular bus connected with a vertical telescopic joint of a lower 500kVGIL pipeline bus, then erecting a supporting platform on the bamboo fiber board, and putting a rotary hydraulic support transfer trolley on the bamboo fiber board paved on the top of the platform;
opening a lower tee joint form end cover connected with a vertical telescopic joint of a lower 500kVGIL pipeline bus, and dismantling a connecting conductor of a lower tee joint and a lower GIL tubular bus straight-line section;
step (3), removing a connecting bolt between the vertical expansion joint and a horizontal flange connected with the lower tee;
step (4), removing a high-voltage outlet bushing of the GIL pipeline bus;
step (5), a nylon sling is tied to the end of the straight line section of the lower GIL tubular bus connected with the vertical expansion joint of the lower 500kVGIL pipeline bus, and the nylon sling is just stressed by a crane;
step (6), the lower tee joint is driven by the lower GIL pipeline bus straight line segment to be separated from the vertical expansion joint, the crane is coordinated and matched to pull the GIL pipeline bus straight line segment to leave an electrified place, and the straight line segment pipeline bus is lifted to the ground in a safe area for disassembly;
step (7), taking a lower flange of the vertical telescopic joint as a support, and winding a high-strength cloth tape on a connecting bolt on the circumference of the flange to support a vertical conductor in the vertical telescopic joint to prevent the vertical conductor from falling;
step (8), opening an upper tee joint form end cover connected with the vertical telescopic joint of the lower 500kVGIL pipeline bus, removing a connecting conductor of an upper tee joint and a straight line section of an upper GIL tubular bus, and taking out the vertical conductor in the vertical telescopic joint;
step (9), installing and fixing a borrow lifting appliance on the top of an upper tee joint of an upper GIL pipeline bus connected with a vertical telescopic joint of a lower 500kVGIL pipeline bus;
step (10), dismantling a vertical expansion joint of a lower 500kVGIL pipeline bus and an upper tee joint form connecting flange bolt;
and (11) hoisting the vertical telescopic joint to a crossing frame on the live-line operation cable channel through a borrow lifting appliance, and then moving the crossing frame to a safe area.
Furthermore, during installation, after the pipeline bus is in place, the dustproof plastic cloth for transportation, the sealing surface cleaning and the sealing ring placing are required to be dismantled, after the fact that no objects are left in the air chamber is confirmed, the flange hole of the pipeline bus moves slowly along the positioning pin to enable the conductor to be inserted firstly, then the two flange surfaces are tightly attached through the light tightening clamp, then the bolts are inserted and fastened, and finally the rest bolts are inserted and fastened.
Further, the borrow hoist includes hot-galvanize channel-section steel and dysmorphism supporting steel plate, it is provided with the three-way pipe to wait to pull down layer pipeline generating line one side free end, the three mouth of pipe department of three-way pipe all is provided with the flange, dysmorphism supporting steel plate has two and symmetry to set up three-way pipe top both ends, both sides be provided with hot-galvanize channel-section steel between the dysmorphism supporting steel plate, hot-galvanize channel-section steel and both sides dysmorphism supporting steel plate forms door shape frame structure, hot-galvanize channel-section steel bilateral symmetry is provided with the connection suspender, both sides connect the suspender below all to be provided with chain block, chain block upper end lifting hook with it is connected to connect the suspender, the lower extreme lifting hook connection of chain block is provided with the.
Further, for the lower-layer GIL pipeline bus vertical expansion joint which is short in safety distance with an adjacent charged body and is overlapped with the upper air, the number and the positions of the wheel disc quick-mounting bearing scaffold and the transfer trolley which need to be erected are calculated according to parameters such as safety distance requirements, field conditions, the position of a grounding block on the pipeline bus, the length of the pipeline bus to be displaced and the like;
after the bamboo fiber board is laid on the surface of the centimeter stone, a supporting platform is erected; then, after leveling and aligning the scaffold by using an adjusting base sleeved on the upright post of the supporting platform, a steel pipe fastener is used for fastening an inclined supporting end support; pre-laying a wood board and a bamboo fiberboard on the top of the supporting platform; erecting a skirting rail at about 180 mm above the top of the supporting platform; a connecting hanging strip which is shortened as much as possible is used for surrounding the borrowing hanging tool;
two nylon hanging belts symmetrically surround the vertical telescopic joint at 180 degrees and are connected with the rope end at one end of a lifting hook hanging belt at the flange neck, the rope end is firmly connected with a main rope by a U-shaped ring, and the other end of the lifting hook hanging belt is hooked on a lifting hook at the lower end of a chain block of a hand-pulling chain of the borrow lifting appliance;
tightening two chain blocks of the borrow lifting appliance, and dismantling the upper tee joint and the horizontal flange connecting bolt of the vertical expansion joint; operating two chain hoists to slowly disassemble and unload the vertical telescopic joint onto a live-line running cable channel crossing frame; the vertical telescopic joint is brought to a safe area.
Further, during installation, the first section of pipeline bus is hung on the rotary hydraulic support transfer trolley at the safe area and is firstly moved to the position below the high-altitude overlapped upper layer live operation pipeline bus; and then, the second section of pipe bus is connected and then displaced, so that the multi-section pipeline bus is displaced to the target position for connection and fastening.
Further, the installation process of the borrowing sling is as follows:
preparing two 300X 300 delta 10mm supporting steel plates, taking the size and the circular arc of three continuous 3X phi 18mm through holes on the circumferences of two sides of the top of the tee joint as reference, and respectively scribing, matching and drilling the 3X phi 18mm through holes and cutting the circular arc at two ends of the supporting steel plates to manufacture the special-shaped supporting steel plates;
the two special-shaped supporting steel plates are respectively fixed on two inner side connecting flanges at the top of the upper tee joint by using 3 high-strength hot-dip galvanized bolts with the thickness of 10.8 grades of M16 × 70 mm;
and cutting equal-length No. 10 hot-dip galvanized steel channels according to the inner side sizes of the two special-shaped supporting steel plates, and welding and fixing the notches downwards in the middles of the other ends of the 3 through holes of the special-shaped supporting steel plates.
Further, gas auxiliary management of GIL equipment is further included before the vertical expansion joint of the lower 500kVGIL pipeline bus is hoisted.
Further, after the vertical expansion joint of the lower 500kVGIL pipeline bus is hoisted, the air chamber management of the GIL equipment is recovered.
Further, the process was carried out without accompanying downtime on an upper 500kV GIL pipe bus arranged in the same direction.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention utilizes limited operation space by optimizing the bearing structure, does not need the cooperation of the upper GIL pipeline bus for power failure, ensures the safe and stable operation of power grid equipment, effectively shortens the hoisting time of the GIL pipeline bus, improves the working efficiency, ensures that the safety risk pre-control is controllable and the repeated investment of people and property is saved. The invention has the advantages of simple structure, convenient operation, small investment, safety, reliability and recycling.
(2) By adopting the invention, when the lower layer pipeline bus is hoisted to vertically extend and retract, the whole process ensures that the upper layer GIL live pipeline bus cannot be influenced, so that live operation equipment can reliably operate.
(3) The borrow lifting appliance can be arranged on the top of a tee joint on a pipeline bus on the upper platform of the vertical telescopic joint to be lifted, and the lifting hook lifting belt can be arranged on two sides of the vertical telescopic joint, so that a stable triangular structure is formed during lifting.
Drawings
FIG. 1 is a schematic structural view of a vertical expansion joint for hoisting a lower GIL pipeline bus bar according to the invention;
FIG. 2 is a side view of the invention hoisting a lower GIL pipeline bus vertical expansion joint;
fig. 3 is a schematic elevation view of the borrowing hoist of the present invention;
in the figure:
1. borrow hoist 2, hand chain calabash 3, connect suspender
4. Lifting hook sling 5, hot galvanizing channel steel 6 and special-shaped supporting steel plate
7. An upper layer pipeline bus 8, a layer pipeline bus 9 to be detached, and a three-way pipe
10. The pipeline bus bar is vertical to the expansion joint.
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 examples of the present invention, and not all examples. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, 2 and 3, the borrowing lifting tool for lifting the vertical telescopic joint of the GIL lower-layer tubular busbar of the embodiment comprises a to-be-dismounted layer pipeline busbar 8 and a lifting unit, wherein the lifting unit comprises a borrowing lifting tool 1, the borrowing lifting tool 1 comprises a hot galvanizing channel steel 5 and a special-shaped supporting steel plate 6, a three-way pipe 9 is arranged at the free end of one side of the to-be-dismounted layer pipeline busbar 8, flanges are arranged at three pipe orifices of the three-way pipe 9, the special-shaped supporting steel plates 6 are two and symmetrically arranged at two ends of the top of the three-way pipe 9, the hot galvanizing channel steel 5 is arranged between the special-shaped supporting steel plates 6 at two sides, the hot galvanizing channel steel 5 is welded with the special-shaped supporting steel plates 6 at two sides to form a door-shaped frame structure, connecting hanging straps 3 are symmetrically arranged at two sides of the channel steel 5, hand chain block 2 is arranged below, the lower end of the chain block 2 is provided with a hook sling 4.
The size of the special-shaped supporting steel plate 6 is 300 x delta 10mm, three continuous through holes are formed in the bottom of the special-shaped supporting steel plate 6, the aperture of each through hole is 18mm, the bottom of the special-shaped supporting steel plate 6 is arc-shaped, 10.8-grade M16 x 70mm high-strength hot-dip galvanized bolts are arranged in the three through holes of the special-shaped supporting steel plate 6 and are correspondingly fixed on two opposite inner side flanges at the top of the three-way pipe 9, the hot-dip galvanized channel steel 5 is made of No. 10 hot-dip galvanized channel steel, and notches of the hot-dip galvanized channel steel are arranged downwards.
The connecting hanging strip 3 and the lifting hook hanging strip 4 are both nylon hanging strips and have the model of EA-60-2T or EB-70-2T.
Before installation, selecting and determining each component according to parameters such as height, weight, lifting point, lifting appliance included angle and the like of a GIL pipeline bus vertical expansion joint to be overhauled and a live-line operation GIL pipeline bus from the ground, installing and fixing a user on the top of a three-way pipe 9 of a 500kV GIL pipeline bus 8 to be detached from a lower layer under the condition that the live-line operation of the 500kV GIL upper layer pipeline bus 7 is carried out during installation, namely different power failure is accompanied, and hoisting the 500kV GIL pipeline bus vertical expansion joint 10 of the lower layer; and then a borrow lifting appliance 1 formed by welding a hot galvanized steel channel 5 and a special-shaped supporting steel plate 6 is arranged on the three-way pipe 9 and fixed.
In the using process, a user connects the two chain blocks 2 to the borrow lifting appliance 1 through the connecting hanging belt 3, so that the two chain blocks 2 are symmetrically arranged on two sides of the vertical expansion joint of the lower-layer GIL pipeline bus to be lifted at an angle of 180 degrees; when the vertical telescopic joint 10 of the lower-layer GIL pipeline bus is dismounted, the borrow lifting appliance 1 is assembled, the connecting bolt is dismounted after the vertical telescopic joint 10 of the pipeline bus is lifted by tightening the chain blocks 2, and the two chain blocks 2 are matched with each other to slowly lift the lower-layer GIL pipeline bus telescopic joint; during hoisting, the borrow lifting appliance 1 is assembled and fixed on the top of the lower-layer pipeline bus three-way pipe 9 and keeps a preset distance with the upper-layer pipeline bus 7 of the upper-layer GIL in live operation, and the whole process ensures that the upper-layer GIL live pipeline bus cannot be influenced, so that live equipment can run reliably.
In this embodiment:
1. the borrow lifting appliance is fixed on the top of the tee joint on the upper pipeline bus through 6 10.8-grade M16 × 70mm hot galvanizing bolts;
2. the connection hanging strip which is shortened as much as possible surrounds the borrow hanging tool;
3. the lifting hook at the upper end of the chain block is connected to the borrow lifting appliance through a connecting lifting belt;
4. the lifting hook hanging belt is wound on the vertical telescopic joint of the pipeline bus and is connected and fixed on a lifting hook at the lower end of the chain block.
The embodiment is used when the power equipment in a high-voltage electrified place is overhauled, the upper 500kV GIL pipeline bus 7 is electrified to operate, namely, under the condition of not accompanying power failure, the three-way pipe 9 is fixedly arranged on the lower 500kV GIL pipeline bus 8, and the lower 500kV GIL pipeline bus vertical expansion joint 10 is hoisted.
In this embodiment, the dysmorphism supporting steel plate of borrow hoist both sides all forms with delta 10 mm's steel sheet and 10 hot-galvanize channel-section steels welding, sets up 6 phi 18 mm's through-holes on the dysmorphism supporting steel plate other end to cut there is the circular arc that is identical with the circular arc that pushes up on the inboard top of tee bend, so that install on waiting to overhaul the pipeline generating line tee bend top.
In the embodiment, each component is selected and determined according to parameters such as the height, the weight, the lifting point, the included angle of a lifting appliance and the like of the bus vertical expansion joint of the GIL pipeline to be overhauled and the bus of the live-line operation GIL pipeline from the ground.
During the use, through connecting the suspender, connect two chain blocks on the hoist of borrowing for two chain blocks become 180 symmetrical arrangement in the perpendicular telescopic joint both sides of lower floor GIL pipeline generating line of waiting to hoist as shown in fig. 2, 3.
When the vertical telescopic section of the lower-layer GIL pipeline bus is dismantled, the borrow lifting appliance is assembled, after the chain block hoist is tightened to lift the telescopic section of the lower-layer pipeline bus, the connecting bolt is dismantled, and the two chain block hoists are matched to slowly hoist the lower vertical telescopic section; during hoisting, the borrow lifting appliance is assembled and fixed on the top of the tee joint on the upper pipeline bus of the lower layer, a preset distance is kept between the borrow lifting appliance and the upper pipeline bus of the upper layer in live operation, and the whole process ensures that the upper pipeline bus of the upper layer in live operation cannot be influenced, so that the live equipment can operate reliably.
The connection suspender, the lifting hook suspender of this embodiment are nylon suspender, and connection suspender, lifting hook suspender can carry out length adjustment as required by the environment.
The installation process of the borrowing lifting appliance of the embodiment is as follows:
preparing two 300X 300 delta 10mm supporting steel plates, taking the size and the circular arc of three continuous 3X phi 18mm through holes on the two sides of the circumference of the top of the tee joint as reference, and respectively scribing, matching and drilling the 3X phi 18mm through holes and cutting the circular arc at the two ends of the supporting steel plates to manufacture the special-shaped supporting steel plates. Two special-shaped supporting steel plates are respectively fixed on two inner side connecting flanges on the top of the upper tee joint by using 3 high-strength hot-dip galvanized bolts with the thickness of 10.8 grades M16 × 70 mm. And cutting equal-length No. 10 hot-dip galvanized steel channels according to the inner side sizes of the two special-shaped supporting steel plates, and welding and fixing the notches downwards in the middles of the other ends of the 3 through holes of the special-shaped supporting steel plates. And (5) making the borrow lifting appliance.
The method for hoisting the vertical expansion joint of the lower 500kVGIL pipeline bus under the condition of no accompanying shutdown comprises the following steps:
step (1), gas auxiliary management of GIL equipment:
using an SF6 gas processing auxiliary device to vacuumize the gas cylinder, recovering gas in an adjacent gas chamber, and reducing the gas pressure (gas pressure, the same below) in the gas chamber to half of the rated gas pressure (half pressure, the same below); then, all gas and residual gas in the gas chamber where the vertical telescopic joint is located are recovered; then removing the upper and lower tee-joint end covers of the GIL pipeline bus connected with the vertical telescopic joint, and recovering residual gas in the gas chamber; and finally, purifying the gas, vacuumizing the gas cylinder, and pressing the purified gas into a steel cylinder for storage.
Gas treatment auxiliary devices in the gas management of GIL plants are prior art. The gas management of the GIL equipment comprises the following specific steps:
1.1 evacuation of the gas cylinder
Checking whether the fittings are intact; pumping for 10 minutes when the vacuum degree reaches 5 Pa; then shutting down; SF6 gas state signboard filled on the gas cylinder;
1.2 recovering the gas in the gas chamber to half pressure, removing the conductor to connect a connecting pipe of the transition gas chamber, and leading the high-pressure gas down from the high altitude through a high-pressure pipeline; in the initial stage of gas recovery, the flow is controlled by a valve, and the gas is directly charged into the gas cylinder from the gas chamber by utilizing the pressure difference formed by high vacuum in the gas cylinder and high pressure in the gas chamber;
before the air chambers are vacuumized, the adjacent air chambers can be vacuumized after half pressure reduction; when the gas of the GIL and the transition gas chamber is recovered to be half pressure, the machine is stopped firstly, and a high-pressure pipeline with a conductor communicated with the transition gas chamber is removed;
1.3 recovery of residual gas from the gas cell
After a high-pressure pipeline communicated with the transition gas chamber is dismantled, the residual gas in the GIL gas chamber can be continuously recovered;
1.4 uncovering and recovering residual gas
Fixing the pipe bound by double-layer plastic cloth at the pipe orifice of the pipeline bus, introducing the other end of the pipe into a plastic cylinder, and extending a high-pressure pipeline of the SF6 gas treatment device into the plastic cylinder to start up the machine and recover residual gas;
1.5 post-purification gas bottle
The purified and purified gas can be filled into the gas cylinder which is vacuumized again after passing the test, and the weight is monitored in real time by using a platform scale during the gas filling.
Step (2), hoisting the vertical expansion joint of the lower 500kVGIL pipeline bus under the condition of no accompanying shutdown
And (3) dismantling or reinstalling typical difficult positions, wherein the typical difficult positions comprise vertical expansion joints which are insufficient in safety distance with adjacent charged bodies and are connected with the lower 500kVGIL pipeline buses of the upper and lower platforms of the same loop.
For a vertical telescopic joint of a lower 500kVGIL pipeline bus of a high-altitude overlapping part and an upper platform pipeline bus and a lower platform pipeline bus of the same loop, when a related air chamber SF6 is recovered and then is disassembled, a portable fast-assembling scaffold working platform is erected on the ground of a common mark stone of a conveying path, and a crossing frame is erected on an electrified running cable channel below the vertical telescopic joint by using materials such as a high-strength bamboo fiber board, channel steel and the like; and paving a high-density bamboo fiber board on the ground of a centimeter stone below a straight line section of a lower GIL tubular bus connected with a vertical telescopic joint of a lower 500kVGIL pipeline bus, then using a supporting platform erected by a wheel disc quick-mounting bearing scaffold on the ground, paving the high-density bamboo fiber board on the top of the platform, and then putting a rotary hydraulic support transfer trolley on the platform.
And opening a lower tee joint shape end cover connected with the vertical telescopic joint of the lower 500kVGIL pipeline bus, and removing a connecting conductor of the lower tee joint and the straight line section of the lower GIL tubular bus.
And (4) removing the connecting bolt between the vertical telescopic joint and the horizontal flange connected with the lower tee joint. Removing a high-voltage outlet bushing of the GIL pipeline bus; and (3) a nylon hanging strip is tied to the end of the straight line section of the lower GIL tubular bus connected with the vertical expansion joint of the lower 500kVGIL pipeline bus, and the nylon hanging strip is just stressed by a crane.
And operating the rotary hydraulic support transfer trolley to separate the lower tee joint from the vertical expansion joint along with the lower GIL pipeline bus straight line segment, commanding the crane to cooperatively cooperate to pull the GIL pipeline bus straight line segment to leave an electrified place, and lifting the straight line segment pipeline bus to the ground in a safe area for dismantling.
The vertical telescopic joint lower flange is used as a support, and the vertical conductors in the vertical telescopic joint are supported by the high-strength white cloth belts in a criss-cross mode to prevent falling.
And opening an upper tee joint form end cover connected with the vertical telescopic joint of the lower 500kVGIL pipeline bus, removing a connecting conductor of the upper tee joint and the straight line section of the upper GIL tubular bus, and taking out the vertical conductor in the vertical telescopic joint.
And (3) installing and fixing a borrow lifting appliance on the top of the upper tee joint of the upper GIL pipeline bus connected with the vertical telescopic joint of the lower 500kVGIL pipeline bus, assembling and connecting lifting belts, lifting hook lifting belts, chain block hoists and the like, and enabling the two chain block hoists to be uniformly stressed.
And (4) dismantling the vertical expansion joint of the lower 500kVGIL pipeline bus and the upper tee joint form connecting flange bolt. And operating the two chain block hoists to hoist the vertical expansion joint to the spanning frame on the live-line operation cable channel and then moving the vertical expansion joint to a safe area.
During installation, after the pipeline bus is in place, the dustproof plastic cloth for transportation, the sealing surface cleaning and the sealing ring placing are required to be dismantled, after the fact that no objects are left in the air chamber is confirmed, the flange hole of the pipeline bus moves slowly along the positioning pin to enable the conductor to be inserted firstly, then the two flange surfaces are tightly attached through the light tightening clamp, then the bolt is inserted and fastened, and finally the remaining bolt is inserted and fastened.
For the lower-layer GIL pipeline bus vertical expansion joint which has insufficient safe distance with the adjacent charged body and is overlapped with the high altitude, calculating the number and the positions of the wheel disc quick-mounting bearing scaffold and the transfer trolley which need to be erected according to parameters such as the safe distance requirement, the field condition, the position of a grounding block on the pipeline bus, the length of the pipeline bus to be displaced and the like;
after laying high-strength bamboo fiber boards on the surface of the centimeter stone, firstly, quickly mounting a bearing scaffold by using a wheel disc to build a supporting platform; then, after leveling and aligning the scaffold by using an adjusting base sleeved on the upright post of the supporting platform, a steel pipe fastener is used for fastening an inclined supporting end support; pre-laying a wood board and a high-strength bamboo fiberboard on the top of the supporting platform; finally, erecting a skirting rail at a position of about 180 mm above the top of the supporting platform by using a steel pipe fastener;
the connecting hanging strip which is shortened as far as possible is used for encircling on the borrow lifting appliance, and the lifting hook at the upper end of the chain block is hung on the borrow lifting appliance through the connecting hanging strip hook.
Two nylon hanging belts symmetrically surround the vertical telescopic joint at 180 degrees and are connected with the rope end at one end of a lifting hook hanging belt at the neck of a flange, the rope end is firmly connected with a main rope by a tool U-shaped ring, and the other end of the lifting hook hanging belt is hooked on a lifting hook at the lower end of a chain block.
Tightening the two chain blocks, and removing the upper tee joint and the horizontal flange connecting bolt of the vertical expansion joint;
and operating the two chain hoists to slowly disassemble and unload the vertical telescopic joint onto the live-line running cable channel crossing frame. The vertical telescopic joint is brought to a safe area.
During installation, the first section of pipeline bus is hung on a rotary hydraulic support transfer trolley in a safe area and is firstly moved to the position below a high-altitude overlapped upper layer live operation pipeline bus; and then, the second section of pipe bus is connected and then displaced, so that the multi-section pipeline bus is displaced to the target position for connection and fastening.
Step (3) recovering GIL equipment air chamber management
Starting from the position close to the air chamber of a vertical expansion joint connected with the upper platform and the lower platform of the lower layer GIL tubular bus, positioning according to the form sequence number of the pipeline bus during dismantling, and temporarily sealing after cleaning a sealing surface on the ground; then hoisting, cleaning again after hoisting, confirming that no residue is butted, and filling dry air with a dew point higher than-40 ℃ into the air chamber if the humidity exceeds or approaches 70%; testing the loop resistance again, and replacing the adsorbent; vacuumizing, detecting leakage under negative pressure, and removing vacuum by using an SF6 gas processing auxiliary device in the negative pressure stage; and finally, inflating, standing, sampling, testing, adjusting pressure, binding, detecting leakage and injecting glue.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A method for hoisting a vertical expansion joint of a lower 500kVGIL pipeline bus is characterized by comprising the following steps: the method comprises the following steps:
dismantling or reinstalling typical difficult positions, wherein the typical difficult positions comprise vertical expansion joints which are insufficient in safety distance with adjacent charged bodies and are connected with upper and lower platform pipeline buses of the same loop through lower 500kVGIL pipeline buses at the high-altitude overlapping parts;
the method comprises the following steps of for a ground overlapped part lower-layer intermediate phase GIL tubular bus:
step (1), when the gas in the related gas chamber SF6 is recovered and then is removed, a working platform is erected on the ground of the common mark stone in the conveying path, and a crossing frame is erected on a live-line operation cable channel below the vertical telescopic joint; paving a bamboo fiber board on the surface of a centimeter stone below a straight line section of a lower GIL tubular bus connected with a vertical telescopic joint of a lower 500kVGIL pipeline bus, then erecting a supporting platform on the bamboo fiber board, and putting a rotary hydraulic support transfer trolley on the bamboo fiber board paved on the top of the platform;
opening a lower tee joint form end cover connected with a vertical telescopic joint of a lower 500kVGIL pipeline bus, and dismantling a connecting conductor of a lower tee joint and a lower GIL tubular bus straight-line section;
step (3), removing a connecting bolt between the vertical expansion joint and a horizontal flange connected with the lower tee;
step (4), removing a high-voltage outlet bushing of the GIL pipeline bus;
step (5), a nylon sling is tied to the end of the straight line section of the lower GIL tubular bus connected with the vertical expansion joint of the lower 500kVGIL pipeline bus, and the nylon sling is just stressed by a crane;
step (6), the lower tee joint is driven by the lower GIL pipeline bus straight line segment to be separated from the vertical expansion joint, the crane is coordinated and matched to pull the GIL pipeline bus straight line segment to leave an electrified place, and the straight line segment pipeline bus is lifted to the ground in a safe area for disassembly;
step (7), taking a lower flange of the vertical telescopic joint as a support, and winding a high-strength cloth tape on a connecting bolt on the circumference of the flange to support a vertical conductor in the vertical telescopic joint to prevent the vertical conductor from falling;
step (8), opening an upper tee joint form end cover connected with the vertical telescopic joint of the lower 500kVGIL pipeline bus, removing a connecting conductor of an upper tee joint and a straight line section of an upper GIL tubular bus, and taking out the vertical conductor in the vertical telescopic joint;
step (9), installing and fixing a borrow lifting appliance on the top of an upper tee joint of an upper GIL pipeline bus connected with a vertical telescopic joint of a lower 500kVGIL pipeline bus;
step (10), dismantling a vertical expansion joint of a lower 500kVGIL pipeline bus and an upper tee joint form connecting flange bolt;
and (11) hoisting the vertical telescopic joint to a crossing frame on the live-line operation cable channel through a borrow lifting appliance, and then moving the crossing frame to a safe area.
2. The method of claim 1, wherein: during installation, after the pipeline bus is in place, the dustproof plastic cloth for transportation, the sealing surface cleaning and the sealing ring placing are required to be dismantled, after the fact that no objects are left in the air chamber is confirmed, the flange hole of the pipeline bus moves slowly along the positioning pin to enable the conductor to be inserted firstly, then the two flange surfaces are tightly attached through the light tightening clamp, then the bolt is inserted and fastened, and finally the remaining bolt is inserted and fastened.
3. The method of claim 1, wherein: borrow a hoist and include hot-galvanize channel-section steel and dysmorphism supporting steel plate, it is provided with the three-way pipe to wait to pull down layer pipeline generating line one side free end, the three mouth of pipe department of three-way pipe all is provided with the flange, dysmorphism supporting steel plate has two and symmetry to set up three-way pipe top both ends, both sides be provided with the hot-galvanize channel-section steel between the dysmorphism supporting steel plate, hot-galvanize channel-section steel and both sides dysmorphism supporting steel plate forms door shape frame structure, hot-galvanize channel-section steel bilateral symmetry is provided with the connection suspender, both sides connect the suspender below all to be provided with chain block chain hoist, chain block chain hoist upper end lifting hook with it is connected to connect the suspender, the lower extreme lifting hook.
4. The method of claim 3, wherein: for the lower-layer GIL pipeline bus vertical expansion joint which has insufficient safe distance with the adjacent charged body and is overlapped with the high altitude, calculating the number and the positions of the wheel disc quick-mounting bearing scaffold and the transfer trolley which need to be erected according to parameters such as the safe distance requirement, the field condition, the position of a grounding block on the pipeline bus, the length of the pipeline bus to be displaced and the like;
after the bamboo fiber board is laid on the surface of the centimeter stone, a supporting platform is erected; then, after leveling and aligning the scaffold by using an adjusting base sleeved on the upright post of the supporting platform, a steel pipe fastener is used for fastening an inclined supporting end support; pre-laying a wood board and a bamboo fiberboard on the top of the supporting platform; erecting a skirting rail at about 180 mm above the top of the supporting platform; a connecting hanging strip which is shortened as much as possible is used for surrounding the borrowing hanging tool;
two nylon hanging belts symmetrically surround the vertical telescopic joint at 180 degrees and are connected with the rope end at one end of a lifting hook hanging belt at the flange neck, the rope end is firmly connected with a main rope by a U-shaped ring, and the other end of the lifting hook hanging belt is hooked on a lifting hook at the lower end of a chain block of a hand-pulling chain of the borrow lifting appliance;
tightening two chain blocks of the borrow lifting appliance, and dismantling the upper tee joint and the horizontal flange connecting bolt of the vertical expansion joint; operating two chain hoists to slowly disassemble and unload the vertical telescopic joint onto a live-line running cable channel crossing frame; the vertical telescopic joint is brought to a safe area.
5. The method of claim 4, wherein: during installation, the first section of pipeline bus is hung on a rotary hydraulic support transfer trolley in a safe area and is firstly moved to the position below a high-altitude overlapped upper layer live operation pipeline bus; and then, the second section of pipe bus is connected and then displaced, so that the multi-section pipeline bus is displaced to the target position for connection and fastening.
6. A method according to claim 1 or 3, characterized in that: the installation process of the borrowing lifting appliance is as follows:
preparing two 300X 300 delta 10mm supporting steel plates, taking the size and the circular arc of three continuous 3X phi 18mm through holes on the circumferences of two sides of the top of the tee joint as reference, and respectively scribing, matching and drilling the 3X phi 18mm through holes and cutting the circular arc at two ends of the supporting steel plates to manufacture the special-shaped supporting steel plates;
the two special-shaped supporting steel plates are respectively fixed on two inner side connecting flanges at the top of the upper tee joint by using 3 high-strength hot-dip galvanized bolts with the thickness of 10.8 grades of M16 × 70 mm;
and cutting equal-length No. 10 hot-dip galvanized steel channels according to the inner side sizes of the two special-shaped supporting steel plates, and welding and fixing the notches downwards in the middles of the other ends of the 3 through holes of the special-shaped supporting steel plates.
7. The method of claim 1, wherein: and gas auxiliary management of GIL equipment is also included before hoisting the vertical expansion joint of the lower 500kVGIL pipeline bus.
8. The method of claim 1, wherein: and recovering gas chamber management of GIL equipment after hoisting the vertical expansion joint of the lower 500kVGIL pipeline bus.
9. The method of claim 1, wherein: the process was carried out without accompanying downtime on an upper 500kV GIL pipe bus arranged in the same direction.
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