CN112467638A - Method for rapidly repairing damage of buried cable - Google Patents
Method for rapidly repairing damage of buried cable Download PDFInfo
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- CN112467638A CN112467638A CN202011076303.3A CN202011076303A CN112467638A CN 112467638 A CN112467638 A CN 112467638A CN 202011076303 A CN202011076303 A CN 202011076303A CN 112467638 A CN112467638 A CN 112467638A
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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
- H02G1/16—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for repairing insulation or armouring of cables
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Abstract
The invention provides a method for rapidly repairing the damage of a directly-buried cable, which is particularly suitable for repairing the damage of a cable outer sheath or the damage of a main insulation of the cable, wherein a high-pressure waterproof insulating composite adhesive tape is used for recovering the insulating tightness of the cable by adopting a half lap type lapping way and recovering the mechanical damage resistance of the cable by using an industrial armor winding tape, the cable does not need to be cut off, namely the original main structure of the cable does not need to be damaged, and only the damaged part of the cable needs to be repaired to prevent water and moisture from entering the cable to cause the insulating fault of the cable; compared with the traditional repairing method, the high-voltage waterproof insulating composite adhesive tape is used for recovering the insulating tightness of the cable by adopting the half lap type lapping, and the industrial armor is used for winding the tape to recover the cable, so that the method is quick and convenient, and the cost is low; an intermediate joint cannot be generated, so that the originality of the cable is ensured, and the original electrical insulation performance of the cable is ensured; only fault points need to be excavated, and the excavation amount of the earth is reduced.
Description
Technical Field
The invention belongs to the technical field of wires and cables, and particularly relates to a method for quickly repairing damage of a buried cable.
Background
At present, in the construction process of a directly-buried cable, when mechanical equipment is used, irreversible mechanical external force damage is easily caused to a cable outer sheath in the ubiquitous process, even damage to main insulation of the cable is caused, and after water and moisture enter the cable through a damaged part, insulation faults of the cable are easily caused.
In order to repair a damaged cable, a method of replacing the whole cable or manufacturing an intermediate joint is generally adopted, but the method is slow in aging and high in cost, and inevitably destroys the original cable structure to generate a new fault point.
Disclosure of Invention
The embodiment of the invention provides a method for rapidly repairing the damage of a buried cable, aiming at solving the problem that the cable structure is damaged in the existing cable damage repairing method; the second purpose is to solve the problems of slow repair aging and high repair cost.
In order to solve the technical problem, the invention provides a method for rapidly repairing the damage of a buried cable, which comprises the following steps:
searching fault points and excavating, judging the damage degree of the cable, and if the cable is damaged to the main insulation of the cable, repairing the damage on the premise of keeping the original cable and not generating an intermediate joint; if only the outer surface of the outer sheath of the cable is scratched, the scratched part is repaired.
Further, if the damage reaches cable main insulation, then repair the damage under the prerequisite that remains former cable and do not produce intermediate head, include:
s101, searching a fault point, digging a groove by taking the fault point as a center, installing a support hanger for supporting a cable in the groove, confirming that the cable is damaged to reach the main insulation of the cable, and carrying out the next step;
s102, cleaning a damaged area of the cable and a sound area around the damaged area, removing sand grains and sundries, wiping with a cleaning towel, standing and drying;
s103, scraping the graphite conductive coating on the surface of the outer sheath in the damaged area and the intact area around the damaged area by using a glass blade;
the scraping length of the damaged area is: covering the damaged area;
the length of the scraped off area of the good area around the damaged area is: scraping the graphite conductive coating with the length of 400mm leftwards by taking the left end of the damaged area as a starting point, and scraping the graphite conductive coating with the length of 400mm rightwards by taking the right end of the damaged area as a starting point;
s104, taking the left end of the damaged area as a starting point, performing circular cutting by using a hand saw at a position 300mm away from the starting point of the left end to the left, taking the right end of the damaged area as a starting point, performing circular cutting by using a hand saw at a position 300mm away from the starting point of the right end to the right, stripping off the outer sheath of the cable between the circular cutting at the two positions, and exposing the steel tape armor;
s105, reserving 50mm at each of two ends of a steel tape armor, polishing paint rust on the 50mm steel tape armor reserved at the two ends, sleeving a constant force spring at a position which is 50mm away from the starting point of the left end rightwards by taking the left end of the steel tape armor as a starting point, sleeving a constant force spring at a position which is 50mm away from the starting point of the right end leftwards by taking the right end of the steel tape armor as a starting point, and circularly cutting the steel tape armor between the two constant force springs by using a hand saw to expose an inner sheath;
s106, fixing the grounding wire to the steel belt armor by using a constant force spring, reversely folding the exposed head of the grounding wire after the grounding wire is wound by the constant force spring for one circle, winding by using the constant force spring, and covering the constant force spring, the steel belt armor and the inner sheath by using filling glue to make two layers back and forth;
s107, keeping 50mm of each of two ends of the exposed inner sheath, marking the two ends with an insulating tape, performing circular cutting on the inner sheath between two marked points by using a hand saw, removing a wrapping tape and fillers, stripping a copper shielding layer and an insulating shielding layer, and exposing a main insulating layer;
after the shielding layers at the two ends are cut off, tightly winding and fixing end parts of the copper shielding layer and the insulating shielding layer by using a stress control belt;
s108, roughening two sides of each ring-cut part respectively, and keeping a uniform slope, wherein the roughened inclined sides are cleaned and no flock is left;
s109, wiping the main insulating layer with a cleaning towel, and keeping the surface dry and clean;
s110, use high-pressure waterproof insulating composite tape to adopt half to take formula winding method to evenly wrap main insulation layer, specifically include:
the high-pressure waterproof insulating composite adhesive tape is stretched by 100% during wrapping, two ends of the wrapping span 100mm of the inner sheath to be wrapped in a half-lap mode, and 4-8 layers of the high-pressure waterproof insulating composite adhesive tape are wound;
s111, reinforcing inner protection of the inner sheath by using a rapid curing type industrial armor winding belt;
uniformly wrapping the end head of the copper belt fixed along the stress control belt on one side to the other end, and connecting the copper shielding layer and the insulating shielding layer;
two ends of the copper strip are fixed by using high-voltage insulating tapes, and the high-voltage insulating tapes are uniformly wrapped by adopting a half lap method, so that the steel strip armor and the copper shielding layer are in good electrical connection and are insulated from each other;
s112, uniformly wrapping the ground wire by using the high-pressure waterproof insulating composite adhesive tape in a half-lap wrapping mode, stretching the high-pressure waterproof insulating composite adhesive tape by 100% during wrapping, crossing an outer sheath at two ends by 100mm to perform half-lap wrapping, and winding 4-8 layers of insulating adhesive tapes;
s113, winding 4-8 layers of polytetrafluoroethylene tapes in a half-lap mode, wherein each layer is wound by 50mm outwards, so that good lap joint with the original graphite conductive coatings at two ends is ensured, and the two ends of each layer cross the composite waterproof adhesive tape by 100mm to form the half-lap lapping mode;
s114, roughening and cleaning graphite layers of original outer sheaths at two sides, winding a waterproof tape or fireproof daub, keeping enough waterproof insulation requirements, and if a cable at a fault point needs to be soaked in water for a long time, pouring an epoxy resin layer around the cable to perform waterproof treatment;
and S115, using the rapid-curing industrial armor winding belt to reinforce the outer protection sleeve as a terminal outer protection layer.
Further, if only the outer surface of the cable outer sheath is scratched, the scratched part can be repaired, and the method comprises the following steps:
s201, searching a fault point, excavating, confirming that only the outer sheath of the cable is damaged, and carrying out the next step;
s202, cleaning the surface of the outer sheath of the cable;
s203, judging the damage degree of the cable outer sheath, confirming that the insulating layer is not damaged, and carrying out the next step;
s204, roughening the intact areas around the damaged areas, and cleaning the roughened areas;
s205, removing and cleaning the graphite conductive coating around the damaged area;
s206, uniformly wrapping the damaged area and the surrounding intact area by using a high-voltage waterproof insulating composite adhesive tape by adopting a half lap type winding method to serve as a primary protective layer;
s207, uniformly wrapping the primary protective layer by using a polytetrafluoroethylene tape by adopting a half lap type winding method to form a secondary protective layer;
s208, roughening the graphite conductive coatings at two ends of the secondary protective layer, and winding a water-blocking tape or fireproof cement in a roughening area to serve as a secondary expansion protective layer;
s209, uniformly wrapping the secondary protective layer and the secondary expanded protective layer by using an industrial armor wrapping tape by adopting a half lap type wrapping method to form a third protective layer;
and S010, cleaning a field, performing nuclear phase detection, insulation detection and voltage resistance test, transmitting power after all the components are qualified, and completing restoration.
Further, it is characterized in that:
step S201, fault point excavation, specifically comprising:
excavating a groove with the length of 4 meters and the depth of 1 meter by taking a fault point as a center, and installing a support hanger for supporting a cable in the groove;
step S202 of cleaning the surface of the outer sheath of the cable, specifically including:
cleaning a damaged area and a surrounding intact area of the cable outer sheath, removing sand grains and sundries, wiping with a cleaning towel, standing and drying;
step S204, roughening the intact area around the damaged area, and cleaning the roughened area, wherein the method specifically comprises the following steps:
roughening the intact area around the damaged area by using a handsaw until the intact area is uniform in gradient and cleaned up, and ensuring that no flock is left;
step S205 of removing and cleaning the graphite conductive coating around the damaged area, specifically including:
scraping the graphite conductive coating in the roughened area by using a glass blade to ensure no residue, wiping by using a cleaning towel, and standing and drying.
Further, step S206 uses the waterproof insulating compound sticky tape of high pressure to adopt half to take formula winding method to evenly lap damaged area and surrounding sound area, as one-level inoxidizing coating, specifically includes:
the starting point of the wrapping covers the edge of one end part of the roughening area, and the covering length is 100 mm;
covering the edge of the other end part of the roughening area at the end point of the wrapping, wherein the covering length is 100 mm;
and the high-pressure waterproof insulating composite adhesive tape is stretched by 100% during wrapping, so that the width of the stretched high-pressure waterproof insulating composite adhesive tape is 1/2 of the width of the high-pressure waterproof insulating composite adhesive tape before stretching.
Further, step S207 uses the polytetrafluoroethylene area to adopt half to take the formula winding method to evenly wrap the primary protection layer, as the secondary protection layer, specifically includes:
covering the starting point of the high-pressure waterproof insulating composite adhesive tape at the starting point of the wrapping, wherein the covering length is 100 mm;
covering the end point of the high-voltage waterproof insulating composite adhesive tape at the end point of the wrapping, wherein the covering length is 100 mm;
and confirming good lap joint with the graphite conductive coatings at the two ends during lapping.
Further, step S208 is to roughen the graphite conductive coatings at the two ends of the secondary protective layer, and the roughened area is to wind a water-blocking tape or fireproof mortar as a secondary expanded protective layer, which specifically includes:
and if the cable at the fault point needs to be soaked in liquid for a long time, a layer of epoxy resin layer is poured around the surface of the water-blocking tape or the surface of the fireproof daub.
Further, step S209 uses the industrial armor winding tape to adopt half to take the formula winding method to evenly wrap second grade inoxidizing coating and second grade extension inoxidizing coating, as tertiary inoxidizing coating, specifically includes:
s901, cleaning the surface of an object to be wound, wearing medical gloves, tearing a package along a tearing opening, putting water into a packaging bag, squeezing and soaking the water-permeable winding belt for 3-4 times, pouring out the water when the temperature exceeds 37 ℃ after 15 seconds, taking out the winding belt from the packaging bag, and squeezing out excessive water in the winding belt;
s902, gradually winding the winding tape along the direction of a 45-degree angle, uniformly winding the winding tape on the secondary protective layer and the secondary expanded protective layer in a half lap mode, and if the winding tape meets the situation that the diameter is suddenly increased or suddenly reduced, reversely folding the winding tape to wind the winding tape.
Further:
if the ambient temperature is lower than 0 ℃, preheating the wound object and the winding belt to more than 2 ℃;
if the ambient temperature is higher than 40 ℃, the step of soaking the winding belt in water is omitted.
The invention has the following beneficial effects:
(1) when the cable is only damaged to the main insulation position, the cable does not need to be cut off, and only the damaged main insulation position needs to be repaired, so that the insulation fault of the cable caused by the fact that water and moisture enter the cable is prevented;
(2) when the cable is only damaged by the outer sheath layer, the original main structure of the cable is not required to be damaged, and only the damaged part of the outer sheath layer of the cable is required to be repaired, so that the insulation fault of the cable caused by the fact that water and moisture enter the cable is prevented;
(3) compared with the traditional repairing method, the high-voltage waterproof insulating composite adhesive tape is used for recovering the insulating tightness of the cable by adopting the half lap type lapping, and the industrial armor is used for winding the tape to recover the cable, so that the method is quick and convenient, and the cost is low;
(4) an intermediate joint cannot be generated, so that the originality of the cable is ensured, and the original electrical insulation performance of the cable is ensured;
(5) only fault points need to be excavated, and the excavation amount of the earth is reduced.
Drawings
Fig. 1 is a radial cross-sectional view of a buried cable.
Description of reference numerals:
1. an outer sheath; 2. steel tape armoring; 3. an inner sheath; 4. wrapping belts; 5. a copper shield layer; 6. an insulating shield layer; 7. a main insulating layer; 8. a conductor shield layer; 9. a conductor.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
In the present invention, the upper, lower, left and right in the drawings are regarded as the upper, lower, left and right of the method for rapidly repairing the damage of the buried cable described in the present specification.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Referring to fig. 1, in a radial cross section of the direct-buried cable, an outer sheath 1, a steel tape armor 2, an inner sheath 3, a tape 4, a copper shield layer 5, an insulation shield layer 6, a main insulation layer 7, a conductor shield layer 8 and a conductor 9 are arranged from an outer layer to an inner layer in sequence, and in the following embodiment, the main insulation damage and the outer sheath damage are divided without involving the conductor shield layer 8 and the conductor 9, so that the conductor shield layer 8 and the conductor 9 are not described in detail.
The first embodiment:
the first embodiment of the invention relates to a method for rapidly repairing the damage of a buried cable, which comprises the following steps:
searching fault points and excavating, judging the damage degree of the cable, and if the cable is damaged to the main insulation of the cable, repairing the damage on the premise of keeping the original cable and not generating an intermediate joint; if only the outer surface of the cable outer sheath 1 is scratched, the scratched part is repaired.
When the cable is only damaged by the outer sheath 1 layer, the original main structure of the cable is not needed to be damaged, and only the damaged part of the outer sheath 1 layer of the cable is needed to be repaired, so that the insulation fault of the cable caused by the fact that water and moisture enter the cable is prevented.
When the cable is only damaged to the main insulation position, the cable does not need to be cut off, and only the damaged main insulation position needs to be repaired, so that the insulation fault of the cable caused by the fact that water and moisture enter the cable is prevented.
Compared with the original solution, the method has small earth excavation amount; the original cable does not need to be cut off, and an intermediate joint cannot be generated; the influence on the structure and the electrical performance of the original cable is small; especially when the length of the on-site cable can not meet the requirement; the method is fast, practical, simple and easy to operate; low cost, safety and reliability.
Second embodiment:
if damaged to cable main insulation, then repair damaged under the prerequisite that remains former cable and do not produce intermediate head, include:
s101, searching a fault point, digging a groove by taking the fault point as a center, installing a support hanger for supporting a cable in the groove, confirming that the cable is damaged to reach the main insulation of the cable, and carrying out the next step;
s102, cleaning a damaged area of the cable and a sound area around the damaged area, removing sand grains and sundries, wiping with a cleaning towel, standing and drying;
s103, scraping the graphite conductive coating on the surface of the outer sheath 1 in the damaged area and the intact area around the damaged area by using a glass blade;
the scraping length of the damaged area is: covering the damaged area;
the length of the scraped off area of the good area around the damaged area is: scraping the graphite conductive coating with the length of 400mm leftwards by taking the left end of the damaged area as a starting point, and scraping the graphite conductive coating with the length of 400mm rightwards by taking the right end of the damaged area as a starting point;
s104, taking the left end of the damaged area as a starting point, performing circular cutting by using a hand saw at a position 300mm away from the starting point of the left end to the left, taking the right end of the damaged area as a starting point, performing circular cutting by using a hand saw at a position 300mm away from the starting point of the right end to the right, stripping off the outer cable sheath 1 between the circular cutting at the two positions, and exposing the steel tape armor 2;
s105, reserving 50mm at each of two ends of the steel tape armor 2, polishing paint rust on the 50mm steel tape armor 2 reserved at the two ends, sleeving a constant force spring at a position 50mm away from the starting point of the left end rightwards by taking the left end of the steel tape armor 2 as a starting point, sleeving a constant force spring at a position 50mm away from the starting point of the right end leftwards by taking the right end of the steel tape armor 2 as a starting point, and circularly cutting the steel tape armor 2 between the two constant force springs by using a hand saw to expose the inner sheath 3;
s106, fixing the grounding wire to the steel tape armor 2 by using a constant force spring, reversely folding the exposed head of the grounding wire after the grounding wire is wound by the constant force spring for one circle, winding by the constant force spring, and covering the constant force spring, the steel tape armor 2 and the inner sheath 3 by using filling glue for two layers back and forth;
s107, keeping 50mm of each of two ends of the exposed inner sheath 3, marking the two ends by using an insulating adhesive tape, circularly cutting the inner sheath 3 between two marked points by using a handsaw, removing the wrapping tape 4 and the filler, stripping the copper shielding layer 5 and the insulating shielding layer 6, and exposing the main insulating layer 7;
after the shielding layers at the two ends are cut off, the stress control belt is used for tightly winding and fixing the end parts of the copper shielding layer 5 and the insulating shielding layer 6;
s108, roughening two sides of each ring-cut part respectively, and keeping a uniform slope, wherein the roughened inclined sides are cleaned and no flock is left;
s109, wiping the main insulating layer 7 with a cleaning towel, and keeping the surface dry and clean;
s110, use high-pressure waterproof insulating composite tape to adopt half to take formula winding method to evenly wrap main insulation layer 7, specifically include:
the high-pressure waterproof insulating composite adhesive tape is stretched by 100% during wrapping, two ends of the wrapping span 3100mm of the inner sheath to form half-lap wrapping, and 4-8 layers of the high-pressure waterproof insulating composite adhesive tape are wound;
s111, reinforcing inner protection of the inner sheath 3 by using a rapid curing type industrial armor winding belt;
uniformly wrapping the end head of the copper belt fixed along the stress control belt on one side to the other end, and connecting the copper shielding layer 5 and the insulating shielding layer 6;
two ends of the copper strip are fixed by using high-voltage insulating tapes, and the high-voltage insulating tapes are uniformly wrapped by adopting a half lap method, so that the steel strip armor 2 and the copper shielding layer 5 are in good electrical connection and are insulated from each other;
s112, uniformly wrapping the ground wire by using a high-pressure waterproof insulating composite adhesive tape in a half-lap wrapping mode, stretching the high-pressure waterproof insulating composite adhesive tape by 100% during wrapping, spanning 1100mm of an outer sheath at two ends to perform half-lap wrapping, and winding 4-8 layers of insulating adhesive tapes;
s113, winding 4-8 layers of polytetrafluoroethylene tapes in a half-lap mode, wherein each layer is wound by 50mm outwards, so that good lap joint with the original graphite conductive coatings at two ends is ensured, and the two ends of each layer cross the composite waterproof adhesive tape by 100mm to form the half-lap lapping mode;
s114, roughening and cleaning graphite layers of original outer sheaths 1 on two sides, winding a water-blocking tape or fireproof daub, and keeping sufficient waterproof insulation requirements, wherein if a cable at a fault point needs to be soaked in water for a long time, an epoxy resin layer needs to be poured around the cable for waterproof treatment;
and S115, reinforcing outer protection of the outer sheath 1 by using a rapid-curing industrial armor winding belt to serve as a terminal outer protection layer.
The high-voltage waterproof insulating composite adhesive tape is also called as a high-voltage cable waterproof insulating composite adhesive tape, is applied to the primary recovery of the insulation of a cable joint, the waterproof protection of various irregular joints, the waterproof and insulation of an overhead insulated wire joint and the basic waterproof and insulating protection of various electrical equipment, and can be obtained commercially.
The rapid curing type industrial armor winding belt, also called as an industrial armor winding belt, has the advantages of rapid curing, external protection enhancement, high and low temperature resistance (40 ℃/90 ℃), convenient wrapping, good formability and the like, and can be obtained commercially.
Specifically, excavation processing is performed on both ends of the fault point. Excavating along two ends of a fault point for 4 meters in length and 1 meter in depth, and supporting and reinforcing the fault phase cable by using a support and hanger tool; cleaning the surface of the cable, cleaning sand and sundries at the damaged part of the cable, and wiping the surface of the cable with a cleaning towel; removing the graphite conductive coating around the damaged part by using a glass blade, scraping the graphite conductive coating to a length about 400mm away from the damaged point, and ensuring that no residue exists around the repaired point; performing circular cutting on the positions 300mm away from the two sides of the damaged position of the cable by using a hand saw, stripping off the outer sheath 1 of the cable to expose the steel armor, and paying attention to avoid damaging the steel armor when the outer sheath 1 is subjected to circular cutting; keeping 50mm of each of two ends of the exposed steel armor, fixing the steel armor by using constant force springs, performing circular cutting on the steel armor between the two constant force springs by using a handsaw to expose the inner sheath 3, and paying attention to avoid damaging the inner sheath when the steel armor is subjected to circular cutting; the method comprises the following steps of (1) respectively polishing paint rust on steel armors with the two ends of the steel armors being reserved by 50mm, fixing a ground wire on the steel armors by using a constant force spring (for firmness, a head with the diameter of 10-20mm is reserved on the ground wire), winding the ground wire by using the constant force spring for one circle, then reversely folding the exposed head, then winding by using the constant force spring, and covering the constant force spring, the steel armors and an inner protection layer by using filling glue for two layers back and forth; the two ends of the exposed inner sheath layer are respectively reserved with 50mm, the inner sheath layer 3 between the two marked points is cut circularly by a hand saw, cable fillers are removed, the damaged phase cable copper shielding layer 5 is stripped, the damaged phase main insulation layer 7 is exposed, and the damage to the cable main insulation layer 7 is avoided when the inner sheath layer 3 is cut circularly; roughening two sides of each circular cut part respectively, and reserving a uniform slope, wherein the beveled edges after roughening are cleaned up without remaining flock; wiping the damaged phase cable main insulating layer 7 by using a cleaning towel, and keeping the surface dry and clean; and (3) carrying out waterproof sealing on the damaged phase main insulation, and uniformly lapping the damaged main insulation part by using a high-pressure waterproof insulating composite adhesive tape (J20/J30) in a half lapping way. When the wrapping is carried out, the insulating tape is stretched by 100 percent, and the two ends of the insulating tape span 100mm of the inner protective layer to carry out the wrapping in a half-lap mode. 4-8 layers of insulating tapes are wound to reinforce the main insulation of the damaged phase. The winding is slightly tensioned to keep the tightness; the inner sheath is reinforced with a fast curing industrial armor wrap. The cable repairing part is protected and supported; the two grounding wires are firmly connected in a twisting mode; uniformly lapping the ground wire by using a high-voltage waterproof insulating composite adhesive tape (J20/J30) in a half lapping way; when in wrapping, the insulating tape is stretched by 100%, the two ends of the insulating tape span 1100mm of the outer sheath to be wrapped in a half lap mode, and 4-8 layers of insulating tapes are wound; winding 4-8 layers of polytetrafluoroethylene tapes in a half-lap mode, wherein each layer is wound by 50mm outwards, so that the polytetrafluoroethylene tapes are well lapped with the original graphite conductive coatings at two ends, and the two ends of the polytetrafluoroethylene tapes cross the composite waterproof adhesive tapes by 100mm to be wound in a half-lap mode; roughening and cleaning graphite layers of original outer sheaths 1 at two sides, winding a waterproof tape or fireproof daub, and keeping sufficient waterproof insulation requirements, wherein if a cable at a fault point needs to be soaked in water for a long time, an epoxy resin layer needs to be poured around the cable for waterproof treatment; the outer protective layer is enhanced by using a fast-curing industrial armor winding belt and is used as a terminal outer protective layer to protect and support the cable repair position; during winding, uniform winding is required to be carried out, the sheath is mounted in a half lap mode, the sheath is ensured to be completely compounded with the cable, and the specific operation method is as follows:
cleaning the surface of the object to be wound, wearing medical gloves, tearing the package along the tearing opening, putting water into the packaging bag, squeezing and pinching the armor tape soaked in water for 3-4 times, pouring out the water after 15 seconds and when the temperature exceeds 37 ℃, taking out the wrapping tape from the packaging bag, and squeezing out excessive water in the wrapping tape;
gradually winding the winding belt along the 45-degree angle direction, uniformly wrapping the winding belt on the polytetrafluoroethylene belt in a half lap mode by force, and slightly applying force to enable the winding belt to be plastic according to the surface of an object. If the diameter of the winding belt is suddenly increased or suddenly reduced, the winding belt can be reversely folded for wrapping;
winding 4-8 layers in the same method, wherein the specific number of layers is different according to different applications;
at 20 ℃, the non-stick state is achieved in 4 minutes, the bearing can be cured in 8-10 minutes, and the requirement of complete curing can be achieved within 24 hours;
armor belt safety issues:
the uncured bandage is not brought into direct contact with the eye or skin to cause discomfort. If the uncured resin is inadvertently contacted, it may be washed with acetone or alcohol.
Armor tape considerations:
if the environmental temperature is lower than 0 ℃, preheating the wound object and the bandage to more than 2 ℃ for achieving the best effect and curing speed;
the temperature of the added water should not exceed 40 deg.C, if the temperature of the operation environment exceeds 40 deg.C, please omit the step of soaking the bandage in water.
In the regions with warm and humid climate, the step of soaking the bandage in water can be omitted, and after the bandage is wound, water can be sprayed on the bandage according to the circumstances to control the curing speed;
the bandage can be used immediately after being opened, if a plurality of bandages need to be wound in one operation, the packages need to be opened one by one according to the requirement;
cleaning the site after repairing, performing nuclear phase and insulation detection, performing a voltage resistance test, checking the repairing effect,
and (5) transmitting power after the test is qualified.
The third embodiment:
the embodiment relates to a method for rapidly repairing damage of a buried cable, which is characterized in that if only the outer surface of a cable outer sheath 1 is scratched, the scratched part is repaired, and the method comprises the following steps:
s201, searching a fault point, excavating, confirming that only the cable outer sheath 1 is damaged, and carrying out the next step;
s202, cleaning the surface of the cable outer sheath 1;
s203, judging the damage degree of the cable outer sheath 1, confirming that the insulating layer is not damaged, and carrying out the next step;
s204, roughening the intact areas around the damaged areas, and cleaning the roughened areas;
s205, removing and cleaning the graphite conductive coating around the damaged area;
s206, uniformly wrapping the damaged area and the surrounding intact area by using a high-voltage waterproof insulating composite adhesive tape by adopting a half lap type winding method to serve as a primary protective layer;
s207, uniformly wrapping the primary protective layer by using a polytetrafluoroethylene tape by adopting a half lap type winding method to form a secondary protective layer;
s208, roughening the graphite conductive coatings at two ends of the secondary protective layer, and winding a water-blocking tape or fireproof cement in a roughening area to serve as a secondary expansion protective layer;
s209, uniformly wrapping the secondary protective layer and the secondary expanded protective layer by using an industrial armor wrapping tape by adopting a half lap type wrapping method to form a third protective layer;
and S010, cleaning a field, performing nuclear phase detection, insulation detection and voltage resistance test, transmitting power after all the components are qualified, and completing restoration.
The cable repair method protected by the embodiment is mainly applicable to the following situations:
(1) when the cable is only damaged on the layer 1 of the outer sheath, the original main structure of the cable is not required to be damaged, and only the damaged part of the layer 1 of the outer sheath of the cable is required to be repaired, so that the insulation fault of the cable caused by the fact that water and moisture enter the cable is prevented;
(2) the field condition does not adopt a processing mode of an intermediate joint, so that the original cable structure is prevented from being damaged, and a new fault point is prevented from being generated;
(3) the length of the on-site cable is limited, when a new cable head is manufactured, the cable from the cable head to a damaged part needs to be cut off, the length of the cable is reduced by about 10m, and when the cable is permanently arranged, the length of the cable cannot meet the requirement;
(4) from an economic standpoint, remanufacturing a cable joint or replacing a cable would result in higher material, mechanical, and labor costs.
Specifically, in the process of laying a cable in construction, phenomena such as scratches and even damages on the surface of the outer sheath 1 of the cable generally exist, a fault point should be found at the moment, the damage condition of the cable is checked and analyzed, and if the outer sheath 1 of the cable is damaged, the method for rapidly repairing the damage of the buried cable provided by the embodiment can be implemented.
In the whole repairing process, the cable does not need to be cut off, compared with the traditional method for replacing the whole cable or manufacturing an intermediate joint, the original cable structure and electrical performance cannot be damaged, the high-pressure waterproof insulating composite adhesive tape used in repairing adopts a mode of semi-lap type winding to recover the insulating sealing performance of the cable and an industrial armor winding tape to recover the mechanical damage resistance of the cable, and the method is not only quick and convenient, and low in cost, but also does not need to damage the original cable structure and performance.
It should be noted that the damaged area in the present embodiment refers to a damaged position, for example, when the cable is scratched, and the scratched position is L-shaped, the L-shape is a damaged area, and the area around the L-shape is intact and is referred to as a intact area around the damaged area.
The half lap winding method refers to a spiral overlapping winding method, i.e. the winding tapes of two adjacent turns overlap or overlap each other, i.e. the winding tape of the next turn partly overlaps the winding tape of the previous turn in the spiral direction.
It should be noted that the wrapping of the half lap type wrapping method is a conventional method in the field of cable construction, and is a method well known to those skilled in the art, and the specific wrapping step does not belong to the protection scope of the present embodiment, and will not be described in detail herein.
Step S201, fault point excavation, specifically comprising:
a groove with the length of 4 meters and the depth of 1 meter is excavated by taking a fault point as a center, and a support and hanger for supporting a cable is installed in the groove and can support and reinforce the cable at the fault point so as to carry out the following repairing steps.
Step S202 of cleaning the surface of the cable outer sheath 1 specifically includes:
cleaning the damaged area and the surrounding intact area of the cable outer sheath 1, removing sand and sundries, wiping with a cleaning towel, standing and drying.
The cleaning towel in the step is used for cleaning the cable, the influence of impurities on the repair can be removed by wiping the surface of the outer sheath 1 of the cable, and attention needs to be paid to keeping the damaged position dry and clean.
Step S203 is to determine the damage degree of the cable outer sheath 1, confirm that the insulating layer is not damaged, and perform the next step; if the insulating layer of the cable outer sheath 1 is damaged, the intermediate joint needs to be remade, and the intermediate joint is processed according to the traditional method, so that the method is not suitable for the repairing method.
Step S204, roughening the intact area around the damaged area, and cleaning the roughened area, wherein the method specifically comprises the following steps:
and (3) roughening the intact areas around the damaged area by using a handsaw, roughening to an even gradient and cleaning up to ensure that no flock is left.
Step S205 of removing and cleaning the graphite conductive coating around the damaged area, specifically including:
scraping the graphite conductive coating in the roughened area by using a glass blade to ensure no residue, wiping by using a cleaning towel, standing and drying, and scraping the length of about 300mm away from the damaged point.
Step S206 uses the high-pressure waterproof insulating composite adhesive tape to adopt half to take formula winding method to evenly wrap damaged area and surrounding intact area, as the primary protection layer, specifically includes:
the starting point of the wrapping covers the edge of one end part of the roughening area, and the covering length is 100 mm;
covering the edge of the other end part of the roughening area at the end point of the wrapping, wherein the covering length is 100 mm;
and the high-pressure waterproof insulating composite adhesive tape is stretched by 100% during wrapping, so that the width of the stretched high-pressure waterproof insulating composite adhesive tape is 1/2 of the width of the high-pressure waterproof insulating composite adhesive tape before stretching.
The high-pressure waterproof insulating composite adhesive tape can be selected from J-20 models or J-30 models, the high-pressure waterproof insulating composite adhesive tape is stretched by 100% during wrapping, the two ends of the high-pressure waterproof insulating composite adhesive tape span 1100mm to be wrapped in a half-lap mode, 4-8 layers of insulating adhesive tapes are wound, the reinforcing outer sheath 1 is insulating, and the high-pressure waterproof insulating composite adhesive tape is slightly tensioned during winding to keep the sealing performance.
Step S207 uses the polytetrafluoroethylene tape to adopt half to take formula winding method to evenly wrap the primary protective layer, as the secondary protective layer, specifically includes:
covering the starting point of the high-pressure waterproof insulating composite adhesive tape at the starting point of the wrapping, wherein the covering length is 100 mm;
covering the end point of the high-voltage waterproof insulating composite adhesive tape at the end point of the wrapping, wherein the covering length is 100 mm;
and confirming good lap joint with the graphite conductive coatings at the two ends during lapping.
Adopt half to take 4 ~ 8 layers of formula winding polytetrafluoroethylene area, every twine the one deck and outwards wind the package 50mm, ensure with both ends former graphite conductive coating overlap joint good, both ends are crossed 100mm of compound waterproof sticky tape and are wound the package with half the formula of taking.
Step S208, roughening the graphite conductive coatings at two ends of the secondary protective layer, winding a water-blocking tape or fireproof cement in a roughening area, and using the roughened area as a secondary expanded protective layer, wherein the method specifically comprises the following steps:
and if the cable at the fault point needs to be soaked in liquid for a long time, a layer of epoxy resin layer is poured around the surface of the water-blocking tape or the surface of the fireproof daub.
Specifically, the original graphite layers of the outer sheaths 1 on the two sides are roughened and cleaned, a waterproof tape or fireproof daub is wound, the sufficient waterproof insulation requirements are kept, and if the cable at the fault point needs to be soaked in water for a long time, a layer of epoxy resin layer needs to be poured around the cable for waterproof treatment.
Step S209 use industry armor winding area to adopt half to take formula winding method to carry out evenly around the package to second grade inoxidizing coating and second grade extension inoxidizing coating, as third grade inoxidizing coating, specifically include:
s901, cleaning the surface of an object to be wound, wearing medical gloves, tearing a package along a tearing opening, putting water into a packaging bag, squeezing and soaking the water-permeable winding belt for 3-4 times, pouring out the water when the temperature exceeds 37 ℃ after 15 seconds, taking out the winding belt from the packaging bag, and squeezing out excessive water in the winding belt;
s902, the winding tape is wound on the secondary protective layer and the secondary expanded protective layer (forcibly) uniformly in a half lap mode along the 45-degree angle direction, and if the winding tape is in a place where the diameter is suddenly increased or reduced, the winding tape can be folded reversely for winding.
In S902, a slight force may be applied during winding so that the winding tape can be attached to the surface of the object according to the plastic deformation of the surface of the object.
Use considerations for industrial armor wrap tape:
the uncured wrap tape is not allowed to come into direct contact with the eyes or skin to avoid discomfort, and if the uncured resin is inadvertently contacted, it may be washed with acetone or alcohol;
if the ambient temperature is lower than 0 ℃, preheating the wound object and the winding belt to more than 2 ℃;
if the ambient temperature is higher than 40 ℃, the step of soaking the winding belt in water is omitted;
in the area with warm and humid climate, the step of soaking the winding belt can be omitted, and after the winding belt is wound, water can be sprayed to the winding belt according to the situation to control the curing speed;
the winding belt can be used immediately, and if a plurality of winding belts need to be wound in one operation, the package needs to be opened one by one according to the requirement.
Specifically, excavation processing is performed on both ends of the fault point. Excavating along two ends of a fault point for 4 meters in length and 1 meter in depth, and supporting and reinforcing the fault phase cable by using a support and hanger tool; cleaning the surface of the cable, cleaning sand and sundries at the damaged part of the cable, wiping the surface of the cable with a cleaning towel, and keeping the damaged part dry and clean; roughening the outer sheaths 1 on both sides of the damaged part of the cable outer sheath 1 by using a handsaw, and leaving uniform slopes, wherein the roughened outer sheaths 1 are cleaned without leaving burrs; removing the graphite conductive coating around the damaged part by using a glass blade, scraping the graphite conductive coating to a length about 300mm away from the damaged point, and ensuring that no residue exists around the repaired point; after the graphite conductive coating at the damaged part is removed, wiping the surface of the cable by using a cleaning towel again, and keeping the surface dry and clean; waterproof sealing of the damaged part of the outer surface of the outer sheath 1, uniformly wrapping the damaged part by using a high-pressure waterproof insulating composite adhesive tape (J20/J30) through half-lap wrapping, stretching the insulating tape by 100% during wrapping, wrapping the two ends of the insulating tape by half-lap wrapping with 1100mm across the outer sheath, winding 4-8 layers of insulating adhesive tapes, insulating the reinforcing outer sheath 1, and slightly tensioning during winding to keep the sealing property; 3-4 layers of plastic insulating tapes are wound on the outer layer of the high-voltage waterproof insulating composite tape; winding 4-8 layers of polytetrafluoroethylene tapes in a half-lap mode, wherein each layer is wound by 50mm outwards, so that the polytetrafluoroethylene tapes are well lapped with the original graphite conductive coatings at two ends, and the two ends of the polytetrafluoroethylene tapes cross the composite waterproof adhesive tapes by 100mm to be wound in a half-lap mode; roughening and cleaning graphite layers of original outer sheaths 1 at two sides, winding a waterproof tape or fireproof daub, and keeping sufficient waterproof insulation requirements, wherein if a cable at a fault point needs to be soaked in water for a long time, an epoxy resin layer needs to be poured around the cable for waterproof treatment; the outer protective layer is enhanced by using a fast-curing industrial armor winding belt and is used as a terminal outer protective layer to protect and support the cable repair position; during winding, uniform winding is required to be carried out, the sheath is mounted in a half lap mode, the sheath is ensured to be completely compounded with the cable, and the specific operation method is as follows:
cleaning the surface of the object to be wound, wearing medical gloves, tearing the package along the tearing opening, putting water into the packaging bag, squeezing and pinching the armor tape soaked in water for 3-4 times, pouring out the water after 15 seconds and when the temperature exceeds 37 ℃, taking out the wrapping tape from the packaging bag, and squeezing off excessive water in the wrapping tape.
Gradually winding the winding belt along the 45-degree angle direction, uniformly wrapping the winding belt on the polytetrafluoroethylene belt in a half lap mode by force, and slightly applying force to enable the winding belt to be plastic according to the surface of an object. If the diameter of the winding belt is suddenly increased or suddenly reduced, the winding belt can be reversely folded for wrapping.
4-8 layers are wound in the same way, the specific number of layers being different for different applications.
At 20 ℃, the non-stick state is achieved in 4 minutes, the load can be cured in 8-10 minutes, and the requirement of complete curing can be achieved within 24 hours.
Armor belt safety issues:
the uncured bandage is not brought into direct contact with the eye or skin to cause discomfort. If the uncured resin is inadvertently contacted, it may be washed with acetone or alcohol.
Armor tape considerations:
if the environmental temperature is lower than 0 ℃, preheating the wound object and the bandage to more than 2 ℃ for achieving the best effect and curing speed; the temperature of the added water is not more than 40 ℃, if the temperature of the operation environment is more than 40 ℃, the step of soaking the bandage is omitted; in the regions with warm and humid climate, the step of soaking the bandage in water can be omitted, and after the bandage is wound, water can be sprayed on the bandage according to the circumstances to control the curing speed; the bandage can be used immediately after being opened, if a plurality of bandages need to be wound in one operation, the packages need to be opened one by one according to the requirement; and cleaning the site after the repair is finished, performing a voltage withstand test after the nuclear phase and insulation detection is qualified, checking the repair effect, and transmitting power after the test is qualified.
In conclusion, the method for rapidly repairing the damage of the buried cable provided by the invention is particularly suitable for repairing the damage of the main insulation and the outer sheath, the cable does not need to be cut off, namely the original main structure of the cable does not need to be damaged, and only the damaged part of the outer sheath layer of the cable needs to be repaired, so that the insulation fault of the cable caused by the fact that water and moisture enter the cable is prevented.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (9)
1. A method for rapidly repairing the damage of a buried cable is characterized by comprising the following steps:
searching fault points and excavating, judging the damage degree of the cable, and if the cable is damaged to the main insulation of the cable, repairing the damage on the premise of keeping the original cable and not generating an intermediate joint; if only the outer surface of the outer sheath of the cable is scratched, the scratched part is repaired.
2. The method for rapidly repairing a damaged buried cable according to claim 1, wherein if the damaged cable is damaged to the main insulation of the cable, the repairing the damaged cable under the condition that the original cable is reserved and an intermediate joint is not generated comprises:
s101, searching a fault point, digging a groove by taking the fault point as a center, installing a support hanger for supporting a cable in the groove, confirming that the cable is damaged to reach the main insulation of the cable, and carrying out the next step;
s102, cleaning a damaged area of the cable and a sound area around the damaged area, removing sand grains and sundries, wiping with a cleaning towel, standing and drying;
s103, scraping the graphite conductive coating on the surface of the outer sheath in the damaged area and the intact area around the damaged area by using a glass blade;
the scraping length of the damaged area is: covering the damaged area;
the length of the scraped off area of the good area around the damaged area is: scraping the graphite conductive coating with the length of 400mm leftwards by taking the left end of the damaged area as a starting point, and scraping the graphite conductive coating with the length of 400mm rightwards by taking the right end of the damaged area as a starting point;
s104, taking the left end of the damaged area as a starting point, performing circular cutting by using a hand saw at a position 300mm away from the starting point of the left end to the left, taking the right end of the damaged area as a starting point, performing circular cutting by using a hand saw at a position 300mm away from the starting point of the right end to the right, stripping off the outer sheath of the cable between the circular cutting at the two positions, and exposing the steel tape armor;
s105, reserving 50mm at each of two ends of a steel tape armor, polishing paint rust on the 50mm steel tape armor reserved at the two ends, sleeving a constant force spring at a position which is 50mm away from the starting point of the left end rightwards by taking the left end of the steel tape armor as a starting point, sleeving a constant force spring at a position which is 50mm away from the starting point of the right end leftwards by taking the right end of the steel tape armor as a starting point, and circularly cutting the steel tape armor between the two constant force springs by using a hand saw to expose an inner sheath;
s106, fixing the grounding wire to the steel belt armor by using a constant force spring, reversely folding the exposed head of the grounding wire after the grounding wire is wound by the constant force spring for one circle, winding by using the constant force spring, and covering the constant force spring, the steel belt armor and the inner sheath by using filling glue to make two layers back and forth;
s107, keeping 50mm of each of two ends of the exposed inner sheath, marking the two ends with an insulating tape, performing circular cutting on the inner sheath between two marked points by using a hand saw, removing a wrapping tape and fillers, stripping a copper shielding layer and an insulating shielding layer, and exposing a main insulating layer;
after the shielding layers at the two ends are cut off, tightly winding and fixing end parts of the copper shielding layer and the insulating shielding layer by using a stress control belt;
s108, roughening two sides of each ring-cut part respectively, and keeping a uniform slope, wherein the roughened inclined sides are cleaned and no flock is left;
s109, wiping the main insulating layer with a cleaning towel, and keeping the surface dry and clean;
s110, use high-pressure waterproof insulating composite tape to adopt half to take formula winding method to evenly wrap main insulation layer, specifically include:
the high-pressure waterproof insulating composite adhesive tape is stretched by 100% during wrapping, two ends of the wrapping span 100mm of the inner sheath to be wrapped in a half-lap mode, and 4-8 layers of the high-pressure waterproof insulating composite adhesive tape are wound;
s111, reinforcing inner protection of the inner sheath by using a rapid curing type industrial armor winding belt;
uniformly wrapping the end head of the copper belt fixed along the stress control belt on one side to the other end, and connecting the copper shielding layer and the insulating shielding layer;
two ends of the copper strip are fixed by using high-voltage insulating tapes, and the high-voltage insulating tapes are uniformly wrapped by adopting a half lap method, so that the steel strip armor and the copper shielding layer are in good electrical connection and are insulated from each other;
s112, uniformly wrapping the ground wire by using the high-pressure waterproof insulating composite adhesive tape in a half-lap wrapping mode, stretching the high-pressure waterproof insulating composite adhesive tape by 100% during wrapping, crossing an outer sheath at two ends by 100mm to perform half-lap wrapping, and winding 4-8 layers of insulating adhesive tapes;
s113, winding 4-8 layers of polytetrafluoroethylene tapes in a half-lap mode, wherein each layer is wound by 50mm outwards, so that good lap joint with the original graphite conductive coatings at two ends is ensured, and the two ends of each layer cross the composite waterproof adhesive tape by 100mm to form the half-lap lapping mode;
s114, roughening and cleaning graphite layers of original outer sheaths at two sides, winding a waterproof tape or fireproof daub, keeping enough waterproof insulation requirements, and if a cable at a fault point needs to be soaked in water for a long time, pouring an epoxy resin layer around the cable to perform waterproof treatment;
and S115, using the rapid-curing industrial armor winding belt to reinforce the outer protection sleeve as a terminal outer protection layer.
3. The method for rapidly repairing the damage of the buried cable according to claim 1, wherein if only the outer surface of the outer sheath of the cable is scratched, the repairing of the scratched part is performed, and the method comprises the following steps:
s201, searching a fault point, excavating, confirming that only the outer sheath of the cable is damaged, and carrying out the next step;
s202, cleaning the surface of the outer sheath of the cable;
s203, judging the damage degree of the cable outer sheath, confirming that the insulating layer is not damaged, and carrying out the next step;
s204, roughening the intact areas around the damaged areas, and cleaning the roughened areas;
s205, removing and cleaning the graphite conductive coating around the damaged area;
s206, uniformly wrapping the damaged area and the surrounding intact area by using a high-voltage waterproof insulating composite adhesive tape by adopting a half lap type winding method to serve as a primary protective layer;
s207, uniformly wrapping the primary protective layer by using a polytetrafluoroethylene tape by adopting a half lap type winding method to form a secondary protective layer;
s208, roughening the graphite conductive coatings at two ends of the secondary protective layer, and winding a water-blocking tape or fireproof cement in a roughening area to serve as a secondary expansion protective layer;
s209, uniformly wrapping the secondary protective layer and the secondary expanded protective layer by using an industrial armor wrapping tape by adopting a half lap type wrapping method to form a third protective layer;
and S010, cleaning a field, performing nuclear phase detection, insulation detection and voltage resistance test, transmitting power after all the components are qualified, and completing restoration.
4. The method for rapidly repairing a buried cable failure according to claim 3, wherein:
step S201, fault point excavation, specifically comprising:
excavating a groove with the length of 4 meters and the depth of 1 meter by taking a fault point as a center, and installing a support hanger for supporting a cable in the groove;
step S202, cleaning the surface of the cable outer sheath specifically includes:
cleaning a damaged area and a surrounding intact area of the cable outer sheath, removing sand grains and sundries, wiping with a cleaning towel, standing and drying;
step S204, roughening the intact area around the damaged area, and cleaning the roughened area, wherein the method specifically comprises the following steps:
roughening the intact area around the damaged area by using a handsaw until the intact area is uniform in gradient and cleaned up, and ensuring that no flock is left;
step S205, removing and cleaning the graphite conductive coating around the damaged area, specifically including:
scraping the graphite conductive coating in the roughened area by using a glass blade to ensure no residue, wiping by using a cleaning towel, and standing and drying.
5. The method for rapidly repairing the damage of the buried cable according to claim 3, wherein the step S206 of uniformly wrapping the damaged area and the surrounding intact area by using the high-pressure waterproof insulating composite tape by using a half lap winding method as a primary protection layer specifically comprises:
the starting point of the wrapping covers the edge of one end part of the roughening area, and the covering length is 100 mm;
covering the edge of the other end part of the roughening area at the end point of the wrapping, wherein the covering length is 100 mm;
and the high-pressure waterproof insulating composite adhesive tape is stretched by 100% during wrapping, so that the width of the stretched high-pressure waterproof insulating composite adhesive tape is 1/2 of the width of the high-pressure waterproof insulating composite adhesive tape before stretching.
6. The method for rapidly repairing the damage of the buried cable according to claim 3, wherein the step S207 of uniformly wrapping the primary protective layer with polytetrafluoroethylene tape by a half lap winding method to form a secondary protective layer specifically comprises:
covering the starting point of the high-pressure waterproof insulating composite adhesive tape at the starting point of the wrapping, wherein the covering length is 100 mm;
covering the end point of the high-voltage waterproof insulating composite adhesive tape at the end point of the wrapping, wherein the covering length is 100 mm;
and confirming good lap joint with the graphite conductive coatings at the two ends during lapping.
7. The method for rapidly repairing the damage of the buried cable according to claim 3, wherein the step S208 of roughening the graphite conductive coating at the two ends of the secondary protective layer, and winding a water-blocking tape or a fireproof mortar around the roughened area as a secondary extension protective layer specifically comprises:
and if the cable at the fault point needs to be soaked in liquid for a long time, a layer of epoxy resin layer is poured around the surface of the water-blocking tape or the surface of the fireproof daub.
8. The method for rapidly repairing the damage of the buried cable according to claim 3, wherein the step S209 of uniformly wrapping the secondary protective layer and the secondary extended protective layer by using the industrial armor wrapping tape by using a half lap type wrapping method as a third protective layer specifically comprises:
s901, cleaning the surface of an object to be wound, wearing medical gloves, tearing a package along a tearing opening, putting water into a packaging bag, squeezing and soaking the water-permeable winding belt for 3-4 times, pouring out the water when the temperature exceeds 37 ℃ after 15 seconds, taking out the winding belt from the packaging bag, and squeezing out excessive water in the winding belt;
s902, gradually winding the winding tape along the direction of a 45-degree angle, uniformly winding the winding tape on the secondary protective layer and the secondary expanded protective layer in a half lap mode, and if the winding tape meets the situation that the diameter is suddenly increased or suddenly reduced, reversely folding the winding tape to wind the winding tape.
9. The method for rapidly repairing a buried cable failure according to claim 8, wherein:
if the ambient temperature is lower than 0 ℃, preheating the wound object and the winding belt to more than 2 ℃;
if the ambient temperature is higher than 40 ℃, the step of soaking the winding belt in water is omitted.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114256781A (en) * | 2021-11-09 | 2022-03-29 | 国网河南省电力公司安阳供电公司 | Maintenance equipment for cable skin |
| CN115117799A (en) * | 2022-07-12 | 2022-09-27 | 远东电缆有限公司 | Method for treating water inflow or damage and damp of extra-high voltage cable |
| CN115333010A (en) * | 2022-09-01 | 2022-11-11 | 广东电网有限责任公司广州供电局 | Cable repair material injection device and installation and use method thereof |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004061743A1 (en) * | 2004-12-22 | 2006-07-06 | Fibre Optics Ct Gmbh | Holes and cracks sealing method and material for uncut cables and pipes, has sealing material selected from self adhesive, chemical and temperature resistance sealing band, central roll spring and other roll spring |
| CN101777705A (en) * | 2009-01-13 | 2010-07-14 | 张逸中 | Method for recovering insulation of flexible joint of high-voltage crosslinking submarine cable |
| CN102361271A (en) * | 2011-08-04 | 2012-02-22 | 江苏圣安电缆有限公司 | Method for repairing damage of external shield of medium and high voltage cable |
| CN105119208A (en) * | 2015-09-16 | 2015-12-02 | 广东韶钢松山股份有限公司 | High-voltage cable insulation breakage repairing process |
| CN105337224A (en) * | 2015-08-24 | 2016-02-17 | 国网天津市电力公司 | Quick restoration method for middle and low voltage XLPE power cable terminal fault |
| JP2018011457A (en) * | 2016-07-14 | 2018-01-18 | 住友電気工業株式会社 | Method for repairing directly-buried cable |
| CN108471092A (en) * | 2018-04-18 | 2018-08-31 | 日照港股份有限公司动力分公司 | The single-phase dry packet restorative procedure of high-tension cable |
| CN111711129A (en) * | 2020-06-29 | 2020-09-25 | 中国化学工程第十一建设有限公司 | Construction method for searching and repairing fault of outer sheath of single-core high-voltage cable |
-
2020
- 2020-10-10 CN CN202011076303.3A patent/CN112467638B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004061743A1 (en) * | 2004-12-22 | 2006-07-06 | Fibre Optics Ct Gmbh | Holes and cracks sealing method and material for uncut cables and pipes, has sealing material selected from self adhesive, chemical and temperature resistance sealing band, central roll spring and other roll spring |
| CN101777705A (en) * | 2009-01-13 | 2010-07-14 | 张逸中 | Method for recovering insulation of flexible joint of high-voltage crosslinking submarine cable |
| CN102361271A (en) * | 2011-08-04 | 2012-02-22 | 江苏圣安电缆有限公司 | Method for repairing damage of external shield of medium and high voltage cable |
| CN105337224A (en) * | 2015-08-24 | 2016-02-17 | 国网天津市电力公司 | Quick restoration method for middle and low voltage XLPE power cable terminal fault |
| CN105119208A (en) * | 2015-09-16 | 2015-12-02 | 广东韶钢松山股份有限公司 | High-voltage cable insulation breakage repairing process |
| JP2018011457A (en) * | 2016-07-14 | 2018-01-18 | 住友電気工業株式会社 | Method for repairing directly-buried cable |
| CN108471092A (en) * | 2018-04-18 | 2018-08-31 | 日照港股份有限公司动力分公司 | The single-phase dry packet restorative procedure of high-tension cable |
| CN111711129A (en) * | 2020-06-29 | 2020-09-25 | 中国化学工程第十一建设有限公司 | Construction method for searching and repairing fault of outer sheath of single-core high-voltage cable |
Non-Patent Citations (1)
| Title |
|---|
| 简磊: "《 高速铁路25kV牵引供电电缆外护套故障分析及应对措施》", 《高速铁路25KV牵引供电电缆外护套故障分析及应对措施》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114256781A (en) * | 2021-11-09 | 2022-03-29 | 国网河南省电力公司安阳供电公司 | Maintenance equipment for cable skin |
| CN114256781B (en) * | 2021-11-09 | 2023-08-08 | 国网河南省电力公司安阳供电公司 | Cable skin maintenance equipment |
| CN115117799A (en) * | 2022-07-12 | 2022-09-27 | 远东电缆有限公司 | Method for treating water inflow or damage and damp of extra-high voltage cable |
| CN115117799B (en) * | 2022-07-12 | 2023-11-28 | 远东电缆有限公司 | Treatment method for water inflow or damage and damp of extra-high voltage cable |
| CN115333010A (en) * | 2022-09-01 | 2022-11-11 | 广东电网有限责任公司广州供电局 | Cable repair material injection device and installation and use method thereof |
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|---|---|
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