CN107240889B - Method for replacing long-distance multi-bundle conductor - Google Patents
Method for replacing long-distance multi-bundle conductor Download PDFInfo
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- CN107240889B CN107240889B CN201710515107.3A CN201710515107A CN107240889B CN 107240889 B CN107240889 B CN 107240889B CN 201710515107 A CN201710515107 A CN 201710515107A CN 107240889 B CN107240889 B CN 107240889B
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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
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
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Abstract
The invention relates to a method for replacing a multi-split conductor in an ultrahigh-voltage transmission line, in particular to a method for replacing a long-distance multi-split conductor. The invention saves a large amount of manpower and tool investment, reduces the labor intensity, shortens the construction period and greatly improves the replacement efficiency of the long-distance quadripartion conductor.
Description
Technical Field
The invention relates to a method for replacing a multi-bundle conductor in an ultrahigh voltage transmission line, in particular to a method for replacing a long-distance multi-bundle conductor.
Background
The multi-split conductor is a conductor erecting mode adopted for restraining corona discharge and reducing line reactance, and is widely applied to ultrahigh-voltage transmission lines. However, with the rapid development of social economy, the power consumption capacity is increased day by day, and the inadaptability of the multi-bundle conductor erected in the early stage, such as insufficient power transmission capacity, aging performance and the like, is remarkable, so that replacement construction is required.
The existing method for replacing the long-distance multi-bundle conductor generally adopts a mode of firstly recovering an old conductor in sections and then spreading a new conductor in the whole section, namely: firstly, removing an old lead accessory, and then loosening and recovering the old lead according to the tension section in a segmented manner; and then, manually unfolding guide ropes of all stages, and unfolding new wires by using a stretching device and a paying-off running board. The mode has the advantages of high labor intensity, high labor input and low construction efficiency, and brings inconvenience to the replacement operation of the multi-bundle conductor.
Disclosure of Invention
The invention aims to provide a method for replacing a long-distance multi-bundle conductor, which is convenient to operate, can reduce labor intensity and labor input and improve construction efficiency according to the defects of the prior art.
The purpose of the invention is realized by the following ways:
the method for replacing the long-distance multi-split conductor is characterized by comprising the following steps of:
1) preparing equipment: the system comprises a reverse traction tensioner for recovering an old lead, a reverse traction rope for the old lead, a brake tensioner for spreading a new lead and a main traction rope for the new lead; the cable laying device comprises a plurality of cable laying pulleys, a splicing sleeve protective sleeve and four-pulling-one cable laying walking plates;
the four-pulling-one paying-off running plate comprises a running plate body, an old lead reverse-pulling rope connecting part and four split old lead connecting parts, wherein the running plate body is in a trapezoidal structure, the short side is connected with the old lead reverse-pulling rope connecting part, and the long side is provided with four connectors which are respectively connected with the four split old lead connecting parts;
2) determining a crossing mode according to a crossed object and the on-site working condition, setting up a crossing frame, and arranging a working site, wherein the working site comprises power failure, electricity inspection and temporary stay wire setting of a tower;
3) removing the old lead accessories: the method comprises the steps of dismantling a vibration damper, a spacer and a jumper, and installing a splicing sleeve protective sleeve on an old lead splicing sleeve;
4) and when the tower type is a tangent tower, hanging a paying-off tackle, and moving an old wire: after the 2 sets of wire lifting devices are used for lifting the old conducting wires, the old conducting wires are disconnected with the hardware string, and the hardware string is loosened to the ground and recovered; then hoisting the paying-off tackle in place, shifting the old wires into the paying-off tackle by using a wire lifter, closing the tackle to finish the suspension of the paying-off tackle, and shifting the old wires into a linear direction from the original square four-angle point according to a set sequence and in an anticlockwise direction to fall into respective tackle grooves when the old wires are shifted into the paying-off tackle;
5) when the tower type is a tension tower, hanging a paying-off tackle and moving an old lead: two pulleys are hung on the strain tower, and the double paying-off sliding workshops are rigidly supported and connected through concentric shafts of the pulleys by two angle steels; providing a motorized winching machine, a winching line and a wire clamping device, simultaneously tightening the sub-wires on the two sides by the winching machine through a steering tackle on the two sides of the same sub-wire of the strain tower by using the wire clamping device until the hardware string is not stressed, releasing the connection between the strain clamp and the hardware string, and loosening the hardware string to the ground for recycling;
arranging a transition steel wire rope according to the sequence of the lead strain clamp steel anchor, the bending resistant connector, the steel wire rope sleeve, the rotary connector, the steel wire rope sleeve, the bending resistant connector and the lead strain clamp steel anchor; then, the transition steel wire rope passes through the two paying-off pulleys to realize the moving-in of the old lead;
meanwhile, winching on two sides of the promoter wire is started, the winching rope is synchronously and slowly loosened, and the winching rope is sent out along the winching rope; completing the transitional transfer-in work of other three sub-conductors by the same method, wherein the transfer-in sequence is executed according to the arrangement sequence of the tangent tower to the front and the back of the pulley;
6) arrangement of old wire traction field: the two reverse traction tensioners are used in parallel to realize synchronous rotation of the two wheel grooves;
after the transition ropes are sleeved in four wheel grooves of two reverse traction tensioners in a traction field, the rope heads of the transition ropes are led to the corresponding sub-wire wheel grooves of the paying-off tackle of each phase and then anchored; the length of the transition rope is determined according to the distance between the traction field and the adjacent old dismantling tower which is 1.5 times;
the old lead is butted with the transition rope by using the old lead steel anchor and the bending-resistant connector; the butt joint of four single-phase sub-wires is completed sequentially by the same method; after the four single-phase sub-conductors are butted with two back-traction tensioners in a traction field, the tension of the old conductor is released, and then the phase old conductor is butted with a braking tensioner in a tension field;
7) arranging an old wire tension field: arranging a braking tensioner in the old lead tension field; firstly, on an adjacent tower in the direction from a tension field close to the tower to a traction field, a through wheel adjacent anchor of the four sub-wires is manufactured through manual wire outgoing;
then the four sub-conductors of the phase close to the pole tower in the tension field are loosened to the ground, and cut-off anchoring is carried out, and the conductor anchoring position is preferably connected with a four-in-one paying-off walking plate according to the tail part after cutting;
the old lead reverse-pulling rope passes through the pay-off pulley on the tension field close to the tower, is guided to the position of the cut-off of the lead, is connected with the old lead reverse-pulling rope connecting part of the four-in-one pay-off running plate and is connected with the old lead through the four-in-one pay-off running plate,
starting a brake tensioner in a tension field to tighten the old lead reverse-pulling rope and empty the reverse-pulling rope, the walking plate and the old lead;
8) recovering the old lead: after the tension machine is stressed, removing the temporary anchoring measures on the line and the equipment;
at the beginning, the wire is reversely pulled at a low speed, the pulling speed is 10-15 m/min, and the balance among the sub-wires is adjusted by a tensioner in a tension field so as to keep the four-pulling one-paying-off running board horizontal; normal traction can be realized after the adjustment is finished, the traction speed is 20-35 m/min,
in the reverse traction process, when the traveling plate is reversely pulled to be 100m away from the paying-off tackle, the braking tension and the tension returning speed of each sub-conductor are properly adjusted, so that the inclination of the traveling plate is consistent with that of the paying-off tackle; when the running board is reversely pulled to be 30-50 m away from the paying-off tackle, the speed is reduced for traction, the traction speed is 10-15 m/min, after the tackle is passed, the normal traction is recovered,
when the splicing sleeve, the tension tube and various repair tubes are reversely pulled to a traction field, the front end of the tension is anchored by the wire clamping device, the position of the compression tube is cut off, and the tension wheel of the reverse-pulling tension machine is used for conducting wire butt joint by utilizing the anti-bending rotary connector and the single-end net sleeve;
the tail part of the back traction tensioner is provided with a pay-off rack, and an empty wire coil is placed on the pay-off rack; after the wires are reversely pulled to the tension wheel, winding 10 turns on the empty wire coil, manually pulling the wire coil to recover the old wires, cutting off and bundling for recovery after the wire coil is full;
9) and (3) laying a new lead: the old lead reverse-pulling rope and the new lead main-pulling rope are butted by an anti-bending connector, and each phase of old lead reverse-pulling rope is converted into a new lead main-pulling rope by adopting a small-sized tensioner and a small-sized tractor in a 'one-to-one' tension spreading mode; and then further laying new wires by a conventional method.
The invention has the following key points:
1. the protective sleeve is arranged on the old wire splicing sleeve, so that the splicing sleeve is prevented from being impacted and broken when passing a pay-off pulley in the tension recovery process of the old wire, and the old wire is broken when being pulled reversely to cause an accident.
2. Four-split old conductors of each tangent tower are lifted by 2 sets of wire lifting devices and then put into a five-wheel wire laying tackle according to a specified sequence, so that twisting among the conductors in reverse traction caused by different sequences is prevented.
3. And (3) tightening the leads on the two sides of the tension tower by using a motorized winching and wire clamping device, connecting the leads on the two sides by using a self-designed transition steel wire rope system, and finally loosening the winching rope to drop the transition steel wire rope on the double pulleys according to a specified sequence. Therefore, the old leads of all the tension sections are connected into a whole, and the smooth proceeding of tension reverse traction is ensured. Meanwhile, the strain clamp drainage plate is sawed off, and the phenomenon that the drainage plate is clamped when the pulley is placed too far is avoided.
4. 2 tensioners are used as reverse traction tensioners, and 1 is used as a braking tensioner. And a traction field and a tension field are reasonably arranged, so that the recovery of the four-split old conductor is safe and reliable.
5. And (3) finishing the butt joint of the old lead and the reverse tension machine by adopting a transition rope, and then releasing the tension of the old lead by using the reverse tension machine.
6. The four-split old conductor is connected with the reverse traction rope through the self-designed 'four-traction-one' paying-off running board, so that the butt joint of the old conductor and the tensioner is realized, the reliable braking tension is ensured when the old conductor is reversely pulled, and the reverse traction rope is spread while the old conductor is reversely pulled.
7. A traction process control method for reverse traction of the four-bundle old conductor is introduced in the old conductor recovery process in the step 8), an effective measure is provided for treatment of a splicing sleeve, a tension tube and various repair tubes of the old conductor in the reverse traction process, and manual tray feeding and recovery of the old conductor are introduced in detail. These ensure the smooth completion of the old wire recovery. And finally, anchoring the reverse traction rope to prepare for unfolding a new lead.
8. The reverse traction rope is used for directly drawing the main traction rope, the primary transition traction rope and the secondary transition traction rope do not need to be expanded again, and the time for expanding and expanding a new lead is saved.
In conclusion, the invention provides a method for replacing a long-distance multi-split conductor, which is characterized in that a specially designed four-pulling one-paying-off walking board is adopted to directly connect a four-split old conductor with a traction rope of a new conductor, two large two-wheel tensioners are adopted as traction equipment to perform reverse traction on the old conductor, one large tensioner is adopted as tension equipment to perform traction rope braking, one-time recovery of the long-distance four-split old conductor and synchronous operation of the traction rope of the new conductor are realized, and then the four-split new conductor is synchronously unfolded in a four-pulling way manner. The invention saves a large amount of manpower and tool investment, reduces the labor intensity, shortens the construction period and greatly improves the replacement efficiency of the long-distance quadripartion conductor.
Drawings
Fig. 1 is a schematic diagram illustrating an old conductor tension field arrangement in the method for replacing a long-distance multi-bundle conductor according to the present invention;
FIG. 2 is a schematic structural view of a four-wire-one-wire running board according to the present invention;
the figures are numbered: 1, a reverse traction tensioner; 2, an empty wire coil pay-off rack; 3, old lead; 4, four-pulling one paying-off walking board; 5, reversely pulling the rope by the old lead; 6, transition ropes; 8, emptying the wire coil; 9, anchoring a line ground anchor; 10, a crane; 41 a board body; 42 old conductor back-guy connection; 43 splitting the old wire connection; 7 netting connectors.
The invention is further elucidated with reference to the drawing.
Detailed Description
The best embodiment is as follows:
the invention provides a method for replacing a long-distance multi-split conductor by replacing a four-split 400 old conductor with an 800 new conductor, which is suitable for multi-split conductor replacement within 5km, and the operation flow is shown in the figure. The method comprises the steps of construction preparation, old lead accessory dismantling, paying-off tackle suspension and old lead moving-in, old lead stretching field arrangement, old lead recovery, new lead unfolding, crimping and the like, and the specific implementation mode is as follows:
3.1 preparation of construction
3.1.1 Main tool configuration
The main stretching equipment and the matched tools are selected as follows:
(1) respectively calculating the braking tension and the back-traction tension of the tensioner when the old lead is recovered, the tension of the braking tensioner when the new lead is spread and the traction force of the tractor, and determining the type selection of the tensioner and the tractor by combining the specification type of the self-contained equipment: when the old wire is recovered, selecting a 2 multiplied by 35kN reverse traction tensioner and a 2 multiplied by 70kN braking tensioner; when a new line is pulled, the 280kN main tractor is selected to be a 2 multiplied by 45kN main tractor, a 90kN small tractor and a 50kN small tension machine. Meanwhile, the phi 22 old conductor back guy and the phi 28 new conductor main guy are configured.
(2) The five-wheel paying-off tackle is grounded and can smoothly pass through a splicing sleeve and a protective sleeve thereof, a strain clamp steel anchor, a transition steel wire rope sleeve, a bending-resistant connector, a selective connector, a four-in-one paying-off walking plate and the like.
Referring to fig. 2, the four-wire-pulling-one-wire running board comprises a running board body 41, an old wire reverse-pulling rope connecting part 42 and four split old wire connecting parts 43, wherein the running board body 41 is in a trapezoidal structure, the short side is connected with the old wire reverse-pulling rope connecting part 42, and the long side is provided with four connectors which are respectively connected with the four split old wire connecting parts 43; the splitting old conductor connecting part 43 is composed of a steel wire rope sleeve and two rotary connectors connected to two ends of the steel wire rope sleeve, wherein one rotary connector is connected to the connector of the board body 41, and the other rotary connector is connected with the old conductor 3 through the net cover connector 7.
(3) And selecting a transition steel wire rope sleeve and a temporary stay wire according to the safety coefficient of 5.0 according to the tightening tension of a single wire.
3.1.2 Cross-over erection
Determining a crossing mode according to the crossed objects and the field working conditions: including single sided single row, double sided multiple row, and suspended span, among others.
3.1.3 workplace layout
(1) Power failure and electricity testing: after the power failure of the line is proved, a group of grounding wires is hung at two ends of the old lead respectively, and the operation can be carried out after full discharge.
(2) Setting of tower temporary stay wire: two temporary stay wires are arranged at the cross arm of each phase of wire, one temporary stay wire is arranged at the cross arm of the optical cable or the ground wire, and the temporary stay wire direction is opposite to the stress direction of the tower when the wires are loosened. Meanwhile, a cross arm reinforcing stay wire is arranged between the temporary stay wire hanging point of the cross arm and the tower body.
3.2 old wire Accessory demolition
3.2.1 dismantling the shockproof hammer and the spacer of the old lead: and (3) dismantling the vibration dampers and the spacing rods on the wires by adopting artificial high-altitude outgoing lines, hoisting by using ropes after dismantling is finished, and loosening to the ground for recycling.
3.2.2 installation of the protective sleeve of the old wire splicing sleeve: in the process of manual high-altitude wire outgoing, the splicing sleeve for the old wire splicing sleeve is protected, whether the old wire is intact and firm is checked and confirmed, and reinforcement measures are taken for the defects of the old wire if necessary. The protection sleeve is arranged on the old wire splicing sleeve to prevent the splicing sleeve from being impacted and broken when passing a pay-off pulley in the tension recovery process of the old wire, so that the old wire is broken when being reversely pulled to cause an accident.
3.2.3 Jumper removal: and lifting the jumper string by using tools and instruments such as a motorized winch, a phi 13 steel wire rope, a 3t steering pulley and the like, and loosening and falling the jumper string to the ground for recycling after removing connecting bolts of the jumper string, a tower and a lead.
3.3 line tackle suspension and old wire transfer
3.3.1 tangent tower paying-off pulley suspension and old conductor moving-in
1) 2 sets of line lifting devices are arranged at the front side and the rear side of the cross arm, and each line lifting device consists of a 6t hand plate hoist, a phi 18 steel wire rope I serving as a two-and-5 t hoisting tackle and a 2 multiplied by 3t double-line lifting device. And after the 2 sets of wire lifting devices are used for lifting the old conducting wires, the connection with the hardware string is released, and the hardware string is loosened to the ground for recycling.
2) Before hoisting, a side wall plate of the five-wheel paying-off tackle is opened, and after the five-wheel paying-off tackle is hoisted in place by a winching machine, the five-wheel paying-off tackle is connected to a construction hole of an iron tower cross arm through a special hanger.
3) And after the old lead is moved into the paying-off tackle by using the wire lifting device, the tackle is closed, and the paying-off tackle suspension is completed.
4) The old wires fall into the respective pulley grooves in sequence by loosening the wire lifting device, and the arrangement sequence of the sub-wires of each phase before and after moving into the pulley is specified as follows (facing to the power receiving side):
① ④ ① ② ③ ④
② ③
wire arrangement before and after moving into the pulley
Four-split old conductors of each tangent tower are lifted by 2 sets of wire lifting devices and then put into a five-wheel wire laying tackle according to a specified sequence, so that twisting among the conductors in reverse traction caused by different sequences is prevented.
3.3.2 Strain tower stringing pulley suspension and old wire moving in
1) The tension tower is hung with double pulleys, two ∠ 75X 8X 1200 angle steels are used for rigid support connection between the double pulleys through concentric shafts of the pulleys, the two angle steels are hung on construction holes on the front side and the rear side of a cross arm through steel wire ropes, and pre-tilt measures are taken.
2) And (3) tightening the sub-conductors on the two sides of the same-phase sub-conductor of the strain tower by using a wire clamping device and a steering pulley through a twisting mill until the hardware string is not stressed, releasing the connection between the strain clamp and the hardware string, and loosening the hardware string to the ground for recycling.
3) The transition steel wire rope is arranged according to the sequence of the lead strain clamp steel anchor, the 5t bending resistant connector, the phi 16 multiplied by 9.0m steel wire rope sleeve, the 5t rotary connector, the phi 16 multiplied by 9.0m steel wire rope sleeve, the 5t bending resistant connector and the lead strain clamp steel anchor. And the transition steel wire rope passes through the two paying-off pulleys to realize the moving-in of the old lead.
4) Meanwhile, winching on two sides of the promoter wire is started, the winching rope is synchronously and slowly loosened and is sent out along the winching rope, and overhead personnel need to check whether the transition steel wire rope falls into the middle groove of the pay-off pulley wheel according to the original requirement. And finishing the transitional moving-in work of other three sub-conductors by the same method, wherein the moving-in sequence is executed according to the arrangement sequence of the linear tower moving-in pulley front and back.
5) After the four sub-wires are moved in a transition mode, high-altitude personnel saw off the drainage fixing plate of the strain clamp by using a hacksaw and grind burrs flat by using a file.
6) And finishing the suspension of the pay-off pulleys of all phases and the moving-in of the old lead in the same way.
And (3) tightening the leads on the two sides of the tension tower by using a motorized winching and wire clamping device, connecting the leads on the two sides by using a self-designed transition steel wire rope system, and finally loosening the winching rope to drop the transition steel wire rope on the double pulleys according to a specified sequence. Therefore, the old leads of all the tension sections are connected into a whole, and the smooth proceeding of tension reverse traction is ensured. Meanwhile, the strain clamp drainage plate is sawed off, and the phenomenon that the drainage plate is clamped when the pulley is placed too far is avoided.
3.5 old wire stretch field arrangement
3.5.1 old wire traction field layout, with reference to fig. 1:
two reverse-traction tensioners are arranged in an old wire traction field, in order to synchronize the reverse-traction speed of the wire, the two reverse-traction tensioners are used in parallel to realize synchronous rotation of two wheel grooves, a transition rope is adopted to complete butt joint of the old wire and the reverse-traction tensioners, and then the tension of the old wire is released by the reverse-traction tensioners:
1) in four wheel grooves of two reverse traction tensioners 1 of a traction field, a phi 13 anti-twisting steel wire rope 6 (transition rope) is sleeved, and then a rope head is led to a sub-wire wheel groove corresponding to each phase of the paying-off tackle to be anchored. The length of the transition rope 6 is determined according to the distance between the traction field and the adjacent old-demolished tower which is 1.5 times.
2) The old conductor steel anchor is utilized, and a 5t bending-resistant connector is adopted to butt the old conductor with a phi 13 anti-twisting steel wire rope 6 (transition rope). And completing the butt joint of the four single-phase sub-conductors according to the specified sequence by the same method.
3) After the four single-phase sub-conductors are butted with the two back-traction tensioners in the traction field, the tension of the old conductor is released, and then the phase old conductor is butted with the tensioners in the tension field.
3.5.2 old wire tension field layout: arranging a tensioner in the tension field of the old lead;
1) firstly, on the adjacent pole tower in the direction from the tension field close to the pole tower to the traction field, the through wheel adjacent anchor of the four sub-wires is manufactured through manual wire outgoing.
2) And then the four sub-conductors of the phase close to the pole tower in the tension field are loosened to the ground, the disconnection anchoring is carried out, and the conductor anchoring position is preferably connected with the four-traction one-paying-off walking plate 4 according to the tail part after the disconnection.
3) A phi 22 old lead reverse-pulling rope 5 passes through a pay-off pulley close to a tower in a tension field, is guided to a lead cutting position, and is connected with an old lead 3 through a specially designed four-in-one pay-off walking plate 4, and reference is made to attached figures 1 and 2;
4) and starting a tensioner in a tension field to tighten the phi 22 old lead reverse-traction rope 5, and emptying the reverse-traction rope, the walking plate and the old lead.
3.6 old wire recovery
1) According to a specified tension setting value, adjusting the back traction tension of the traction field back traction tensioner and the brake tension of the tension field tensioner: the back traction tension of the traction field back traction tensioner is about 20kN, and the braking tension of the tension field tensioner is about 60 kN.
2) After the tension machine is stressed, the anchor measures on the line and the equipment are removed. Meanwhile, anti-induction electric measures are really taken in construction, and effective grounding is arranged on both sides of the tension field.
3) At the beginning, the wires are reversely pulled at a low speed (the pulling speed is 10-15 m/min), and the balance among the sub-wires is adjusted by a tensioner in a tension field so as to keep the four-wire-pulling-one-paying-off running board horizontal. And (4) after the adjustment is finished, normal traction can be performed (the traction speed is 20-35 m/min), and measures for preventing the walking board from overturning are required during traction.
4) In the reverse traction process, when the traveling plate is reversely pulled to be 100m away from the paying-off tackle, a wire protection worker needs to pay close attention to and report the balance condition of the traveling plate and the distance from the paying-off tackle at any time, and properly adjust the braking tension and the tension returning speed of each sub-wire to ensure that the inclination of the traveling plate is consistent with that of the paying-off tackle; when the running board is reversely pulled to a distance of 30-50 m away from the pay-off tackle, a commander is informed to reduce the speed for traction (the traction speed is 10-15 m/min), and when the tackle is passed, all people are normal, and the people can normally pull after standing to a safe position.
5) When the splicing sleeve, the tension tube and various repair tubes are reversely pulled to a traction field, the front end of the tension is anchored by the wire clamping device, the position of the compression tube is cut off, and the tension wheel of the reverse-pulling tension machine is used for conducting wire butt joint by the anti-bending rotary connector and the single-end net sleeve.
6) The tail part of the back traction tensioner is provided with a pay-off rack, and an empty wire coil is placed on the pay-off rack. After the wires are reversely pulled to the tension wheel, the wires are firstly wound on the empty wire coil for 10 circles, then the wire coil is manually pulled to recover the old wires, and the wires are cut off and bundled for recovery after the wire coil is full.
7) And (3) replacing each phase of old lead with phi 22 old lead reverse guy according to the method, and anchoring the old lead on two sides of a stretching field.
3.7 new lead unfolding:
1) and butting the phi 22 old lead reverse guy rope and the phi 28 new lead main guy rope by using an anti-bending connector, and switching each phase of the phi 22 old lead reverse guy rope into the phi 28 new lead main guy rope by adopting a small-sized tensioner and a small-sized tractor in a 'one-to-one' tension spreading mode. The exit brake tension of the mini-tensioner is about 40kN and the traction of the mini-tractor is about 60 kN.
2) A large tractor and a tensioner are adopted to synchronously spread and spread 4 new wires in the same phase in a one-pull-four tension spreading and spreading mode through a 250kN running board. The braking tension of the large-scale tension machine is about 40kN, and the traction force of the large-scale traction machine is about 200 kN-250 kN.
3) And then further laying new wires by a conventional method. Because the reverse traction rope is used for directly drawing the main traction rope, the primary transition traction rope and the secondary transition traction rope do not need to be expanded again, and the time for expanding and releasing a new lead is greatly saved.
The parts of the invention not described are the same as the prior art.
Claims (1)
1. The method for replacing the long-distance multi-split conductor is characterized by comprising the following steps of:
1) preparing equipment: the system comprises a reverse traction tensioner for recovering an old lead, a reverse traction rope for the old lead, a brake tensioner for spreading a new lead and a main traction rope for the new lead; the cable laying device comprises a plurality of cable laying pulleys, a splicing sleeve protective sleeve and four-pulling-one cable laying walking plates;
the four-pulling-one paying-off running plate comprises a running plate body, an old lead reverse-pulling rope connecting part and four split old lead connecting parts, wherein the running plate body is in a trapezoidal structure, the short side is connected with the old lead reverse-pulling rope connecting part, and the long side is provided with four connectors which are respectively connected with the four split old lead connecting parts;
2) determining a crossing mode according to a crossed object and the on-site working condition, setting up a crossing frame, and arranging a working site, wherein the working site comprises power failure, electricity inspection and temporary stay wire setting of a tower;
3) removing the old lead accessories: the method comprises the steps of dismantling a vibration damper, a spacer and a jumper, and installing a splicing sleeve protective sleeve on an old lead splicing sleeve;
4) and when the tower type is a tangent tower, hanging a paying-off tackle, and moving an old wire: after the 2 sets of wire lifting devices are used for lifting the old conducting wires, the old conducting wires are disconnected with the hardware string, and the hardware string is loosened to the ground and recovered; then hoisting the paying-off tackle in place, shifting the old wires into the paying-off tackle by using a wire lifter, closing the tackle to finish the suspension of the paying-off tackle, and shifting the old wires into a linear direction from the original square four-angle point according to a set sequence and in an anticlockwise direction to fall into respective tackle grooves when the old wires are shifted into the paying-off tackle;
5) when the tower type is a tension tower, hanging a paying-off tackle and moving an old lead: two pulleys are hung on the strain tower, and the double paying-off sliding workshops are rigidly supported and connected through concentric shafts of the pulleys by two angle steels; providing a motorized winching machine, a winching line and a wire clamping device, simultaneously tightening the sub-wires on the two sides by the winching machine through a steering tackle on the two sides of the same sub-wire of the strain tower by using the wire clamping device until the hardware string is not stressed, releasing the connection between the strain clamp and the hardware string, and loosening the hardware string to the ground for recycling;
arranging a transition steel wire rope according to the sequence of the lead strain clamp steel anchor, the bending resistant connector, the steel wire rope sleeve, the rotary connector, the steel wire rope sleeve, the bending resistant connector and the lead strain clamp steel anchor; then, the transition steel wire rope passes through the two paying-off pulleys to realize the moving-in of the old lead;
meanwhile, winching on two sides of the promoter wire is started, the winching rope is synchronously and slowly loosened, and the winching rope is sent out along the winching rope; completing the transitional transfer-in work of other three sub-conductors by the same method, wherein the transfer-in sequence is executed according to the arrangement sequence of the tangent tower to the front and the back of the pulley;
6) arrangement of old wire traction field: the two reverse traction tensioners are used in parallel to realize synchronous rotation of the two wheel grooves;
after the transition ropes are sleeved in four wheel grooves of two reverse traction tensioners in a traction field, the rope heads of the transition ropes are led to the corresponding sub-wire wheel grooves of the paying-off tackle of each phase and then anchored; the length of the transition rope is determined according to the distance between the traction field and the adjacent old dismantling tower which is 1.5 times;
the old lead is butted with the transition rope by using the old lead steel anchor and the bending-resistant connector; the butt joint of four single-phase sub-wires is completed sequentially by the same method; after the four single-phase sub-conductors are butted with two back-traction tensioners in a traction field, the tension of the old conductor is released, and then the phase old conductor is butted with a braking tensioner in a tension field;
7) arranging an old wire tension field: arranging a braking tensioner in the old lead tension field; firstly, on an adjacent tower in the direction from a tension field close to the tower to a traction field, a through wheel adjacent anchor of the four sub-wires is manufactured through manual wire outgoing;
then the four sub-conductors of the phase close to the pole tower in the tension field are loosened to the ground, and cut-off anchoring is carried out, and the conductor anchoring position is preferably connected with a four-in-one paying-off walking plate according to the tail part after cutting;
the old lead reverse-pulling rope passes through the pay-off pulley on the tension field close to the tower, is guided to the position of the cut-off of the lead, is connected with the old lead reverse-pulling rope connecting part of the four-in-one pay-off running plate and is connected with the old lead through the four-in-one pay-off running plate,
starting a brake tensioner in a tension field to tighten the old lead reverse-pulling rope and empty the reverse-pulling rope, the walking plate and the old lead;
8) recovering the old lead: after the tension machine is stressed, removing the temporary anchoring measures on the line and the equipment;
at the beginning, the wire is reversely pulled at a low speed, the pulling speed is 10-15 m/min, and the balance among the sub-wires is adjusted by a tensioner in a tension field so as to keep the four-pulling one-paying-off running board horizontal; normal traction can be realized after the adjustment is finished, the traction speed is 20-35 m/min,
in the reverse traction process, when the traveling plate is reversely pulled to be 100m away from the paying-off tackle, the braking tension and the tension returning speed of each sub-conductor are properly adjusted, so that the inclination of the traveling plate is consistent with that of the paying-off tackle; when the running board is reversely pulled to be 30-50 m away from the paying-off tackle, the speed is reduced for traction, the traction speed is 10-15 m/min, after the tackle is passed, the normal traction is recovered,
when the splicing sleeve, the tension tube and various repair tubes are reversely pulled to a traction field, the front end of the tension is anchored by the wire clamping device, the position of the compression tube is cut off, and the tension wheel of the reverse-pulling tension machine is used for conducting wire butt joint by utilizing the anti-bending rotary connector and the single-end net sleeve;
the tail part of the back traction tensioner is provided with a pay-off rack, and an empty wire coil is placed on the pay-off rack; after the wires are reversely pulled to the tension wheel, winding 10 turns on the empty wire coil, manually pulling the wire coil to recover the old wires, cutting off and bundling for recovery after the wire coil is full;
9) and (3) laying a new lead: the old lead reverse-pulling rope and the new lead main-pulling rope are butted by an anti-bending connector, and each phase of old lead reverse-pulling rope is converted into a new lead main-pulling rope by adopting a small-sized tensioner and a small-sized tractor in a 'one-to-one' tension spreading mode; and then further laying new wires by a conventional method.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108899801B (en) * | 2018-08-07 | 2020-10-30 | 武汉里得电力科技股份有限公司 | Bypass operation method based on distribution line maintenance and matched operation device thereof |
| CN110854734B (en) * | 2019-11-18 | 2021-02-12 | 浙江省送变电工程有限公司 | Method for replacing large yoke plate of strain insulator string of extra-high voltage direct current transmission line |
| CN111244814B (en) * | 2020-01-20 | 2021-01-26 | 广东电网能源发展有限公司 | Construction method of net sealing protection device of four-bundle conductor |
| CN111244815B (en) * | 2020-01-20 | 2021-01-26 | 广东电网能源发展有限公司 | Method for building three-phase lead net sealing protection device |
| CN112290457A (en) * | 2020-10-30 | 2021-01-29 | 国网河南省电力公司周口供电公司 | Construction method of carbon fiber composite core wire |
| CN114221263B (en) * | 2021-12-01 | 2023-07-18 | 浙江省送变电工程有限公司 | Method for replacing Zhang Dace damaged wire resistant among multi-split wire files in long distance |
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