CN111355187B - Method for replacing ground wire by crossing high-speed rail by using old lead net sealing - Google Patents
Method for replacing ground wire by crossing high-speed rail by using old lead net sealing Download PDFInfo
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- CN111355187B CN111355187B CN202010277485.4A CN202010277485A CN111355187B CN 111355187 B CN111355187 B CN 111355187B CN 202010277485 A CN202010277485 A CN 202010277485A CN 111355187 B CN111355187 B CN 111355187B
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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
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
Abstract
The invention discloses a method for replacing a lead and ground wire by crossing high-speed rail by using an old lead blocking net, and relates to the field of methods for replacing the lead and ground wire of an overhead transmission line by crossing high-speed rail. The construction of replacing the ground wire of the high-speed rail is generally carried out by adopting a method of erecting crossing frames on two sides of the high-speed rail for net sealing, and the construction method has the advantages of longer construction period and higher construction cost. The method utilizes an old pole tower, adopts a tension and extension integrated machine with tension to utilize an old ground wire to drag and release a new wire, and adopts 4 sub-wires in one phase, the operations of net sealing and net detaching are respectively twice, the lower part of each sub-wire replacement of each phase is protected by a capping net, the capping net arranged when the wire is replaced by the ground wire is protected, the phase wires and the ground wires on two sides of the old pole tower on two sides of a crossing point are protected by binding steel wire sleeves, and the installation of accessories after the capping net is detached is also protected. The method does not need to set up a spanning frame, arrange a traction steel wire rope, and have no guide rope and traction steel wire rope reversing links, thereby shortening the construction period, reducing the construction cost and improving the construction safety.
Description
Technical Field
The invention relates to the field of methods for replacing a ground wire of an overhead transmission line across a high-speed rail, in particular to a method for replacing the ground wire across a high-speed rail by using an old wire for net sealing.
Background
Along with the rapid occurrence of high-speed rails, the replacement of the old lead of the overhead transmission line crossing the high-speed rails can better guarantee the safe operation of the high-speed rails, but the construction requirement period for replacing the lead and ground wires crossing the high-speed rails is short, the construction difficulty is high, and the construction can be started only after the net is sealed above the electric equipment of the rails in the neutral period of the high-speed rail operation at night. In general, the method of erecting crossing frames on two sides of a high-speed rail is adopted for sealing nets, and the construction method is long in construction period and high in construction cost. With the normalization of the construction of replacing old lead wires across high-speed rails, a construction method for replacing lead wires across high-speed rails, which is safe, can shorten the construction period and reduce the construction cost, is needed.
Disclosure of Invention
The technical problem to be solved and the technical task provided by the invention are to perfect and improve the prior technical scheme, and provide a method for replacing a ground wire by using the higher crossing iron of an old wire sealing net, so as to shorten the construction period and reduce the construction cost. Therefore, the invention adopts the following technical scheme.
A method for replacing a ground wire by using an old wire blocking crossing high-speed rail comprises the following steps:
1) weaving a top sealing net on the ground;
2) respectively installing safety steel wire sleeves on a left phase lead, a right phase lead and a ground wire of towers crossing two sides of a high-speed rail, wherein the towers all continue to use old towers;
3) dismantling a conductor spacer and a ground conductor damper in the frame line section;
4) respectively punching reverse side reinforcing pull wires on the towers at two ends of the stringing section;
5) four side phase single-wheel pay-off pulleys are hung on a left cross arm and a right cross arm main material of a tower respectively, wherein the left cross arm is a left side phase single-wheel pay-off pulley, the right cross arm is a right side phase single-wheel pay-off pulley, and the side phase single-wheel pay-off pulleys are hung near a lead;
6) sequentially loosening the sub-conductors and removing the wire clamps, and positioning the four sub-conductors of the left phase and the right phase in a wheel groove of the side-phase single-wheel paying-off pulley;
7) hanging a middle-phase single-wheel paying-off pulley, sequentially lifting and loosening the middle-phase sub-conductors and removing wire clamps, and positioning the middle-phase four sub-conductors in a wheel groove of the middle-phase single-wheel paying-off pulley;
8) adjusting a left-phase single-wheel paying-off tackle of the left cross arm and a right-phase single-wheel paying-off tackle of the right cross arm to enable the distance between the two tackles to be the width of the capping net, selecting one base tower spanning two sides of the high-speed rail as a starting point, correspondingly sleeving sub-wires of two tackle wheel grooves with the adjusted distances between the left cross arm and the right cross arm at two ends of all transverse capping ropes of the braided capping net on the side needing capping net, and connecting the sub-wires;
9) the wire outgoing is carried out on the two sub-conductors by using a flying car, the whole top sealing net is manually pushed to the far end of a preset net sealing point, the top sealing net is ensured to cover a low-speed rail at a high position, a transverse net sealing rope is anchored on the two sub-conductors, a transverse steel wire rope is arranged at the end part of the top sealing net, and the steel wire rope needs to be anchored with a liner soft object on the conductor;
10) the net pulling nylon rope followed out of the top sealing net is utilized to complete the top sealing arrangement of the whole net;
11) two paying-off pulleys are respectively hung on the tension towers at the two ends of the tension section;
12) respectively removing the connection of two sub-wires on the tension towers at the two ends of the tension section, wherein the sub-wires are connected with tension equipment;
13) completing tension expansion of the middle-phase four new sub-conductors;
14) removing the capping nets above the high-speed rail according to the reverse sequence of the capping nets;
15) adjusting a left-phase single-wheel paying-off tackle spanning the lower part of left-phase cross arms of iron towers on two sides of a high-speed rail;
the whole capping net is pushed to the far end of a preset net sealing point by using a coaster outgoing line on two sub-leads farthest from the lower part of the left cross arm, and a transverse net sealing rope is anchored on the two sub-leads;
17) two sub-wires without capping nets on the tension towers at two ends of the tension section are respectively dismantled, and the sub-wires are connected with tension equipment;
18) finishing the traction of the two sub-wires;
19) removing the first left-phase top sealing net;
20) the positions of two groups of left-phase single-wheel paying-off pulleys below the left-phase cross arm are changed according to the direction of the sub-wires;
21) two new wires pulled in place are tightened, and anchors are respectively arranged on the cross arms of the iron towers at the two ends of the tension section;
22) the wire is drawn out by a galloping vehicle, the whole capping net is pushed to the far end of the preset net sealing point, and the transverse net sealing rope is anchored on the two sub-wires;
23) respectively removing the two left old sub-leads on the tension towers at the two ends of the tension section, wherein the sub-leads are connected with tension equipment;
24) finishing the traction of the two sub-wires;
25) adjusting the positions of four left-phase single-wheel paying-off pulleys below left-phase cross arms on iron towers on two sides of a high-speed rail;
26) one side of the tension tower at two sides of the tension section is hung with a back force, and the other side is hung horizontally with a high altitude tension line, and the installation of the left phase attachment of the tangent tower in the tension section, the left phase drainage setting of the tension tower and the installation of the left phase conductor spacer are completed;
27) and (4) referring to the step of changing the left phase conductor, and finishing the construction of changing the right phase conductor and the right phase ground wire in sequence. The method can effectively shorten the construction period, reduce the construction cost and ensure safe and reliable construction by replacing the ground wire with the old pole tower and the old lead.
As a preferable technical means: in the step 1), nylon ropes with the diameter of phi 10-phi 12 are adopted in the longitudinal direction and the transverse direction of each top sealing net, the nylon ropes are woven into lattices according to the distance of 1.5-2.5m, the net ropes are knotted and fixed, the woven number is determined according to the actual construction requirement, and the length and the width of the top sealing net are determined according to the construction working condition of a crossing point. The weaving of the top sealing net is effectively realized.
As a preferable technical means: in the step 4), the beaten tower reinforcing stay wire adopts 2 steel wire ropes as the stay wire of the lead, 1 steel wire rope as the stay wire of the ground wire, and the included angle of the ground anchor stay wire to the ground is less than or equal to 45 degrees. The tower reinforcement can be effectively realized.
As a preferable technical means: in the step 5), the side phase single-wheel paying-off pulleys are hung and arranged according to normal stringing construction, four side phase single-wheel paying-off pulleys hung on the main materials of the left cross arm and the right cross arm are arranged in parallel according to 2 groups at equal intervals in the transverse direction, the transverse interval is 40-60cm, and the wheel grooves are arranged along the direction along the line. The arrangement of the side-phase single-wheel paying-off tackle is effectively realized.
As a preferable technical means: in the step 6), the head parts of the left cross arm and the right cross arm are provided with steel wire ropes, the steel wire ropes are provided with movable pulleys, the sub-conductors are sequentially lifted and loosened by using a pulley group, the wire clamps are removed, the corresponding side phase single-wheel paying-off pulleys are adjusted by a hoist so that the sub-conductors can be conveniently displaced and positioned to wheel grooves, the positioning of the left and right phase conductors of the tangent tower in the tension section to the wheel grooves of the side phase single-wheel paying-off pulleys is completed, and the positioning of the left and right phase four sub-conductors is realized.
As a preferable technical means: in the step 7), the four middle-phase single-wheel paying-off pulleys are transversely arranged in parallel in a straight line, and the wheel grooves are arranged along the direction along the line. Effectively arranging a middle-phase single-wheel paying-off tackle and realizing the positioning of the middle-phase four sub-conductors.
As a preferable technical means: in the step 10), a net pulling nylon rope which follows from the top sealing net assists in slowly pulling back the top sealing net and a runaway wire outlet worker at the side of a tower where the net sealing operation on two sides of a high-speed rail starts, the pulling back distance is consistent with the grid spacing of the top sealing net nylon rope, the nodes of the top sealing net are anchored one by one until the top sealing of the whole net is finished, and finally, a transverse steel wire rope is installed at the end part of the net sealing. And the capping arrangement of the whole net is realized.
As a preferable technical means: in the step 11), the suspension point of the double-paying-off tackle is arranged on the construction hole right below the wire suspension point, and the two tackle of each group of double-paying-off tackle are connected by a hard support. The hanging of the double-line tackle is realized.
As a preferable technical means: in the step 12), a stringing pulley group is utilized to remove the connection of two sub-leads and an insulator string, a strain compression joint pipe is cut off, a lead head at the side of a traction field is sleeved in a traction net sleeve, and the lead head penetrates through a stringing pulley and is connected with a traction rope which is manually spread through a rotary connector to a stretching integrated machine; the head of the tension field side lead is pressed and connected with a traction compression joint pipe, passes through a paying-off tackle and is connected to a tensioner through a rotary connector and a traction rope which is manually laid and provided with a new lead.
As a preferable technical means: in the step 13), in the process of unfolding, the paying-off sag at a crossing point is monitored through a theodolite, communication is kept smooth, the clearance distance between the wire and the steel wire rope and the capping net is strictly controlled to be not less than 3m through tension adjustment, the safety of the crossing construction is ensured, two new sub-wires are pulled in place and adjacent to anchors on sites at two sides, then the sub-wires are detached from a tractor device, and the tension unfolding of the remaining two sub-wires in the middle phase is completed by adopting the same pulling mode.
Has the advantages that:
1. the stretching equipment is adopted to bring tension, old wires are used for dragging and releasing new wires, 4 sub-wires in one phase are used, the net sealing operation and the net detaching operation are respectively performed twice, the capping net protection is performed below each sub-wire in each phase, the ground wire replacement is performed by using the capping net arranged during the wire replacement, the protection measures are ensured in the whole process of wire replacement construction, the hidden danger of damaging the high-speed electric gasification equipment does not exist, and the safety is high.
2. The replacement of the ground wire adopts the tension of a tension device to stretch new wires by pulling old wires one by one, a traction steel wire rope is not required to be arranged, the links of guide rope and traction steel wire rope reversing do not exist, the spanning construction period can be shortened, and the construction cost is reduced.
3. The crossing frame does not need to be erected on two sides of the high-speed rail, the crossing construction cost can be reduced, the construction links are reduced, the crossing construction period is shortened, the application range is wide, the safety of the crossed power line, the high-speed rail and the highway can be ensured, the popularization and the implementation are easy, and the operability is good.
Drawings
FIG. 1 is a schematic view of a capping web of the present invention.
FIG. 2 is a schematic top view of a crossover point of the present invention.
Fig. 3 is a schematic diagram of the arrangement of the safety wire sheath of the present invention.
FIG. 4 is a schematic diagram of the left-phase single-wheel line laying tackle hanging before shifting.
FIG. 5 is a schematic diagram of the right phase single-wheel line laying tackle of the invention hanging before shifting.
FIG. 6 is a front view of the side phase single-wheel line laying tackle of the invention before shifting.
FIG. 7 is a schematic view of the installation of the line tackle and the capping net tackle.
FIG. 8 is a side view of the same single block in the invention.
FIG. 9 is a schematic top view of the blocking screen in the crossing point of the present invention.
FIG. 10 is a schematic view of the stringing pulley of the tension tower of the present invention.
FIG. 11 is a schematic view of the left-phase single-wheel line tackle of the present invention being hung after the first displacement.
FIG. 12 is a schematic top view of the first left-hand screen of the present invention.
In the figure: 1, pole tower; 2-high-speed rail; 3-middle phase conductor; 4-left phase conductor; 5-right phase conductor; 6-insurance steel wire sleeve; 7-insulator string; 8-ground line; 9-left cross arm; 10-left phase single wheel paying off tackle; 11-right cross arm; 12-right phase single wheel paying off tackle; 13-phi 17.5 multiplied by 1m steel wire sheath; 14-5t chain block; a 15-phi 17.5 multiplied by 2m steel wire sleeve; 16-middle phase single wheel paying off tackle; 17-phi 17.5 multiplied by 5m steel wire sheath; 18-capping net; 19- Φ 8.7 steel wire rope; a 20-sub-conductor; 21-a strain tower; 22-double payoff pulleys; and 23-hard support.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the drawings in the specification.
The method for replacing the ground wire by the high-speed rail crossing of the old wire blocking net comprises the following steps:
s1, weaving the capping net 18 on the ground, weaving nylon ropes with phi 12 in the longitudinal and transverse directions of each capping net 18 into net lattices according to the interval of 2m, knotting and fixing the net ropes, determining the number of the woven nets according to the actual construction requirement, and determining the length and width of the capping net 18 according to the construction working condition of a crossing point, as shown in figure 1;
s2, as shown in figures 2 and 3, respectively installing safety steel wire sleeves 6 on a left phase lead 4, a right phase lead 5 and a ground wire 8 of a tower 1 spanning two sides of a high-speed rail 2, wherein the lead adopts a phi 17.5 multiplied by 25m safety steel wire sleeve 6, the ground wire 8 adopts a phi 15 multiplied by 3m specification, the safety device can be detached until the installation of accessories is finished, gunny bags are wrapped outside the safety steel wire sleeves 6 to prevent an insulator string 7, the lead and the ground wire 8 from being damaged, and the tower 1 continues to use the old tower;
s3, detaching the conductor spacer and the ground conductor damper in the frame line segment;
s4, respectively drilling reverse side reinforcing pull wires on the towers 1 at two ends of the stringing section, drilling the tower 1 reinforcing pull wires, wherein the guide wire adopts 2 phi 15 steel wire ropes, the ground wire 8 adopts 1 phi 15 steel wire rope, the ground anchor adopts 160kN grade, and the included angle of the pull wires to the ground is less than or equal to 45 degrees;
s5, as shown in the figures 4-6, hanging four side phase single-wheel paying-off pulleys on a left cross arm 9 and a right cross arm 11 main material of a tower 1 respectively, wherein the left cross arm 9 is a left side phase single-wheel paying-off pulley 10, the right cross arm 11 is a right side phase single-wheel paying-off pulley 12, the side phase single-wheel paying-off pulleys are hung and arranged according to normal overhead line construction, the four side phase single-wheel paying-off pulleys hung on the left cross arm 9 and the right cross arm 11 main material are arranged in parallel according to 2 groups at equal intervals in the front and back direction, the transverse interval is 50cm, the specification of the pulleys is phi 660/560, a wheel groove is arranged along the direction of a line to meet the requirement of dismounting and shifting of a lead accessory, the four side phase single-wheel paying-off pulleys are hung and arranged near the lead by adjusting a 5t chain block 14, a paying-off pulley V type is arranged, a steel wire block is arranged between two hanging points of a V-type device according to the width of a capping net 18, a 2-set 6.3t shackle + 17.5 x 1m and a 13+5t chain block + 14 x 5t chain block + 2.5 x, the inner sides of the main materials of the binding points of the pulleys are internally padded with round wood and externally wrapped with hemp gaskets;
s6, arranging phi 13 steel wire ropes and 50kN movable pulleys at the heads of a left cross arm 9 and a right cross arm 11, sequentially loosening the sub-conductors 20 by using a pulley group and removing wire clamps, adjusting corresponding side phase single-wheel paying-off pulleys by using a 5t chain block 14, facilitating the sub-conductors 20 to be shifted and put in place to wheel grooves, completing the putting in place of left and right phase conductors of a tangent tower in a tension section to the wheel grooves of the side phase single-wheel paying-off pulleys, and realizing the putting in place of the left and right phase four sub-conductors 20;
s7, hanging middle phase single-wheel line-laying tackle 16, arranging four middle phase single-wheel line-laying tackle 16 horizontally in a straight line shape in parallel, arranging wheel grooves along the direction along the line, adopting phi 660/560 specification for the middle phase single-wheel line-laying tackle 16, hanging 2 shackles of 6.3t and 2 steel wire sleeves 17 with phi 17.5 multiplied by 5m and 6.3t for the middle phase single-wheel line-laying tackle 16 in a single phi 660/560, sequentially loosening the middle phase wires and removing wire clamps, and positioning the middle phase four wires into the wheel grooves of the middle phase single-wheel line-laying tackle 16;
s8, as shown in figure 7, adjusting a left-phase single-wheel paying-off tackle 10 of a left cross arm 9 and a right-phase single-wheel paying-off tackle 12 of a right cross arm 11 to enable the distance between the two tackle to be 6 meters of the width of a capping net 18, selecting one base tower 1 spanning two sides of a high-speed rail 2 as a starting point, and sleeving sub-wires 20 on wheel grooves of two side-phase single-wheel paying-off tackle with the adjusted distance between the left cross arm 9 and the right cross arm 11 at two ends of all transverse capping ropes of the braided capping net 18 on the side needing capping and heading respectively;
s9, as shown in figure 9, a runaway is used for outgoing lines on the two sub-leads 20, the whole top sealing net 18 is manually pushed to the far end of a preset net sealing point, the top sealing net 18 is ensured to cover a lower high-speed rail 2 at a high position, a transverse net sealing rope is anchored on the two sub-leads 20, a transverse phi 8.7 steel wire rope 19 is installed at the end part of the top sealing net, and the steel wire rope needs to be anchored on a lead to be lined with soft materials;
s10, utilizing phi 12 net pulling nylon ropes traced out from the top sealing net 18 to assist in slowly pulling back the top sealing net 18 and a runaway outgoing person on the side of the tower 1 spanning two sides of the high-speed rail 2 for the net sealing operation, wherein the pulling back distance is consistent with the grid spacing of the nylon ropes of the top sealing net 18, anchoring the nodes of the grid of the top sealing net 18 one by one until the top sealing of the whole net is finished, and finally, installing a transverse phi 8.7 steel wire rope 19 at the end part of the top sealing net to realize the top sealing arrangement of the whole net;
s11, as shown in figure 10, hanging double-paying-off pulleys 22 on the tension tower 21 at the two ends of the tension section respectively, wherein the hanging points of the double-paying-off pulleys 22 are on the construction holes right below the wire hanging points, the two pulleys of each group of double-paying-off pulleys 22 are connected by hard supports 23, and the hanging mode of each set of pulleys is as follows: 2 shackles of 7t, steel wire sleeves of phi 21.5 multiplied by 2.5m are folded in half, and 1 shackle of 7t, a five-wheel paying-off pulley are arranged;
s12, removing the connection of two sub-leads and an insulator string 7 by using a stringing pulley group, cutting off a strain compression joint pipe, sleeving a lead head at the side of a traction field into a traction net sleeve, penetrating through a stringing pulley and connecting the stringing pulley and a phi 20 traction rope which is manually unfolded to a stretching all-in-one machine through an 80kN rotary connector; the head of the tension field side lead is pressed and connected with a traction compression joint pipe, passes through a stringing pulley and is connected with a phi 20 traction rope which is manually unfolded and provided with a new lead to a tensioner through an 80kN rotary connector;
s13, tension unfolding of the four middle-phase new sub-conductors is completed, in the unfolding process, a specially-assigned person monitors the paying-off sag at a crossing point through a theodolite, communication is kept smooth, the wires and the steel wire ropes are strictly controlled to keep a clearance distance not less than 3m with the top sealing net 18 through tension adjustment, the safety of crossing construction is ensured, the two new sub-conductors are pulled in place and adjacent to anchors on sites at two sides, then the two new sub-conductors are detached from a tractor device, and the tension unfolding of the remaining two middle-phase sub-conductors is completed in the same pulling mode;
s14, after the middle phase conductor 3 is unfolded, removing the capping nets 18 above the high-speed rails 2 according to the reverse sequence of the capping nets;
s15, as shown in figure 11, adjusting the left-phase single-wheel line tackle 10 under the left-phase cross arm of the iron tower on two sides of the high-speed rail 2: adjusting a 5t chain hoist 14 of two left-phase single-wheel pay-off pulleys 10 hung below a left-phase cross arm to enable the two left-phase single-wheel pay-off pulleys 10 to be close to the end part and the root part of the cross arm respectively, adjusting the rest two left-phase single-wheel pay-off pulleys 10 below the left-phase cross arm to be close to the middle part of the cross arm, controlling the vertical distance between the two pay-off pulleys close to the middle part of the cross arm and the bottom part of the cross arm to be 4 meters, controlling the left-right distance between the two pay-off pulleys to be 30cm, controlling the vertical distance between the two pay-off pulleys close to the end part and the root part of the cross arm and the bottom part of;
s16, as shown in figure 12, a runaway is used for outgoing on the two sub-leads 20 farthest from the lower part of the left cross arm 9, the whole capping net 18 is manually pushed to the far end of a preset net sealing point, net sealing is completed by adopting a middle phase line-changing net sealing method, the capping net 18 is ensured to cover the lower high-speed rail 2 at a high position, a transverse net sealing rope is anchored on the two sub-leads 20, a transverse phi 8.7 steel wire rope 19 is installed at a certain distance from the end part of the capping net, and the steel wire rope is anchored on the leads and needs to be lined with soft materials;
s17, respectively removing two sub-leads 20 without the capping nets 18 on the tension towers 21 at the two ends of the tension section, removing the connection between the two sub-leads 20 without the capping nets 18 on the tension towers 21 at the two ends of the tension section and the insulator string 7 by using a stringing pulley group, cutting off a tension resisting compression joint pipe, sleeving a lead head at the side of a traction field into a traction net sleeve, penetrating through a pay-off pulley and connecting the lead head with a phi 20 traction rope which is manually unfolded to a tension integrated machine through an 80kN rotary connector; the head of the tension field side lead is pressed and connected with a traction compression joint pipe, passes through a stringing pulley and is connected with a phi 20 traction rope which is manually unfolded and provided with a new lead to a tensioner through an 80kN rotary connector;
s18, finishing the traction of the two sub-wires 20 according to the middle-phase traction mode, and temporarily not detaching from the tractor equipment after the new two sub-wires 20 are dragged in place and approach anchors on the sites at two sides;
s19, removing the top sealing nets 18 on the two left-phase old sub-conductors 20 according to the reverse sequence of the net sealing;
s20, the positions of two groups of left-phase single-wheel line-laying pulleys 10 below the left-phase cross arm are exchanged according to the direction of the sub-lead 20: the positions of two sets of line tackle blocks at the high position and the low position below the left-phase cross arm are exchanged on two basic iron towers crossing two sides of the high-speed rail 2 through chain hoists, and a set of side-phase single-wheel line tackle blocks far away from the cross arm in the exchanging process all penetrate through the upper part of a set of side-phase single-wheel line tackle blocks close to the middle part of the cross arm;
s21, tightening the two new leads to 70% of tension by using a tension machine, and respectively approaching anchors on the cross arms of the tension towers 21 at the two ends of the tension section, wherein the approaching anchors must use two sets of anchor line devices for safety;
s22, carrying out wire outgoing by a galloping, carrying out net sealing between the two new sub-wires by the manual galloping wire outgoing according to the previous net sealing method, pushing the whole top sealing net 18 to the far end of the preset net sealing point, and anchoring the transverse net sealing rope on the two sub-wires;
s23, removing the connection between two sub-leads without the capping net 18 on the strain towers 21 at the two ends of the tension section and the insulator string 7 by using a stringing pulley group, respectively removing the two remaining old sub-leads on the left phases of the strain towers 21 at the two ends of the tension section, cutting off a strain compression joint pipe, sleeving a lead head at the side of a traction field into a traction net sleeve, penetrating through a pay-off pulley and connecting the pay-off pulley and a phi 20 traction rope which is manually unfolded to a tension integrated machine through an 80kN rotary connector; the head of the tension field side lead is connected with a traction compression joint pipe in a compression joint mode, penetrates through a pay-off tackle and is connected to a tensioner through rotation of an 80kN connector, and a phi 20 traction rope and a new lead which are manually unfolded are connected to the tensioner;
s24, finishing the traction and wire changing of the remaining two sub-wires according to the method for the traction and wire changing of the first two sub-wires of the left phase;
s25, after the line change of the four new sub-conductors on the left phase is finished, the top sealing net 18 is removed, and the four line laying pulleys below the cross arm are adjusted to the accessory installation position by using a 5t chain block 14;
s26, hanging a back force on one side of the tension tower 21 on the two sides of the tension section, horizontally hanging a high-altitude tension line on one side of the tension tower, and completing installation of left-phase accessories of the tangent tower in the tension section, left-phase drainage erection of the tension tower 21 and installation of a spacer of a left-phase lead 4;
and S27, sequentially finishing the wire changing construction of the right-phase lead 5 and the right-phase ground wire 8 by referring to the wire changing step of the left-phase lead 4.
The method can effectively shorten the construction period, reduce the construction cost and ensure safe and reliable construction by replacing the ground wire with the old pole tower and the old lead.
The method for replacing the ground wire by using the old wire blocking net crossing the high-speed rail shown in fig. 1 to 12 is a specific embodiment of the present invention, has embodied the outstanding substantive features and significant progress of the present invention, and can make equivalent modifications in shape, structure and the like according to the practical use requirements and under the teaching of the present invention, all falling within the protection scope of the present scheme.
Claims (7)
1. A method for replacing a ground wire by using an old wire blocking crossing high-speed rail is characterized by comprising the following steps:
1) weaving a top sealing net on the ground;
2) respectively installing safety steel wire sleeves on a left phase lead, a right phase lead and a ground wire of towers crossing two sides of a high-speed rail, wherein the towers all continue to use old towers;
3) dismantling a conductor spacer and a ground conductor damper in the frame line section;
4) respectively punching reverse side reinforcing pull wires on the towers at two ends of the stringing section;
5) four side phase single-wheel pay-off pulleys are respectively hung on a left cross arm and a right cross arm main material of a tower, wherein the left cross arm is a left phase single-wheel pay-off pulley, the right cross arm is a right phase single-wheel pay-off pulley, and in order to meet the requirement of removing and shifting a lead accessory, the side phase single-wheel pay-off pulleys are all hung near a lead;
6) sequentially loosening the sub-conductors and removing the wire clamps, and positioning the four sub-conductors of the left phase and the right phase in a wheel groove of the side-phase single-wheel paying-off pulley;
7) hanging a middle-phase single-wheel paying-off pulley, sequentially lifting and loosening the middle-phase sub-conductors and removing wire clamps, and positioning the middle-phase four sub-conductors in a wheel groove of the middle-phase single-wheel paying-off pulley;
8) adjusting a left-phase single-wheel paying-off tackle of the left cross arm and a right-phase single-wheel paying-off tackle of the right cross arm to enable the distance between the two tackles to be the width of the capping net, selecting one base tower spanning two sides of the high-speed rail as a starting point, correspondingly sleeving sub-wires of two tackle wheel grooves with the adjusted distances between the left cross arm and the right cross arm at two ends of all transverse capping ropes of the braided capping net on the side needing capping net, and connecting the sub-wires;
9) the wire outgoing is carried out on the two sub-conductors by using a flying car, the whole top sealing net is manually pushed to the far end of a preset net sealing point, the top sealing net is ensured to cover a low-speed rail at a high position, a transverse net sealing rope is anchored on the two sub-conductors, a transverse steel wire rope is arranged at the end part of the top sealing net, and the steel wire rope needs to be anchored with a liner soft object on the conductor;
10) the net pulling nylon rope followed out of the top sealing net is utilized to complete the top sealing arrangement of the whole net;
11) hang respectively on the strain insulator tower at tractive section both ends and establish two unwrapping wire coasters, two unwrapping wire coasters hang the point on the construction hole under the wire is hung the point, adopt the hardstay to link to each other between two coasters of every two unwrapping wire coasters of group, the hanging mode of every set of coaster: 2 shackles, steel wire sleeves and a five-wheel paying-off pulley;
12) connecting two sub-wires with an insulator string is removed by using a stringing pulley group, a strain pressure-resisting connecting pipe is cut off, a wire guide head at the side of a traction field is sleeved in a traction net sleeve, and the traction net sleeve penetrates through a stringing pulley and is connected with a traction rope which is manually spread through a rotary connector to a traction and tensioning integrated machine; the head of the tension field side lead is pressed and connected with a traction compression joint pipe, passes through a stringing pulley and is connected to a tensioner through a rotary connector and a traction rope which is manually unfolded and provided with a new lead;
13) tension unfolding of the middle phase four new sub-conductors is completed, in the unfolding process, a specially-assigned person monitors the paying-off sag at a crossing point through a theodolite, communication is kept smooth, the wires, the steel wire ropes and the capping net are strictly controlled to keep a clearance distance not less than 3m through tension adjustment, the safety of the spanning construction is ensured, the two new sub-conductors are drawn in place and adjacent to anchors on sites at two sides, then the two new sub-conductors are detached from a tractor device, and the tension unfolding of the middle phase remaining two sub-conductors is completed by adopting the same drawing mode;
14) after the middle phase lead is unfolded, removing the capping nets above the high-speed rails according to the reverse sequence of the capping nets;
15) adjusting a left-phase single-wheel paying-off tackle crossing the lower part of left-phase cross arms of iron towers on two sides of a high-speed rail: adjusting chain blocks of two left-phase single-wheel pay-off pulleys hung below a left-phase cross arm to enable the two left-phase single-wheel pay-off pulleys to be close to the end part and the root part of the cross arm respectively, adjusting the rest two left-phase single-wheel pay-off pulleys below the left-phase cross arm to be close to the middle part of the cross arm, controlling the vertical distance between the two pay-off pulleys close to the middle part of the cross arm and the bottom of the cross arm, controlling the left-right distance between the two pay-off pulleys, controlling the vertical distance between the two pay-off pulleys close to the end part and the root part of the cross arm and the bottom of the;
16) the wire outgoing is carried out on the two sub-wires farthest from the lower part of the left cross arm by using a flying vehicle, the whole capping net is manually pushed to the far end of a preset capping point, the net capping is completed by adopting a middle-phase wire-changing net capping method, the capping net is ensured to cover a lower high-speed rail at a high position, a transverse net capping rope is anchored on the two sub-wires, a transverse steel wire rope is installed at a certain distance from the end part of the capping net, and the anchoring of the steel wire rope on the wire requires a liner soft object;
17) two sub-wires without the top-sealed nets on the tension towers at two ends of the tension section are respectively dismantled, the connection between the two sub-wires without the top-sealed nets on the tension towers at two ends of the tension section and an insulator string is dismantled by using a wire tightening pulley set, a tension resisting compression joint pipe is cut off, a wire guide head at the side of a traction field is sleeved in a traction net sleeve, and the traction net sleeve penetrates through a wire releasing pulley and is connected to a tension integrated machine through a rotary connector and a manually released traction rope; the head of the tension field side lead is pressed and connected with a traction compression joint pipe, passes through a stringing pulley and is connected to a tensioner through a rotary connector and a traction rope which is manually unfolded and provided with a new lead;
18) finishing the traction of the two sub-wires according to a middle-phase traction mode, and temporarily not detaching from a tractor device after the new two sub-wires are dragged in place and adjacent to anchors on sites on two sides;
19) removing the top sealing nets on the two left-phase old sub-wires according to the reverse sequence of the net sealing;
20) the positions of two groups of left-phase single-wheel paying-off pulleys below the left-phase cross arm are changed according to the direction of the sub-wires: the positions of two sets of line tackle blocks at the high position and the low position below the left phase cross arm are exchanged on two base iron towers crossing two sides of a high-speed rail through chain hoists, and a set of side phase single-wheel line tackle blocks far away from the cross arm in the exchanging process all penetrate through the upper part of a set of side phase single-wheel line tackle blocks close to the middle part of the cross arm;
21) tensioning two new wires pulled in place by using a tensioning machine to set tensioning tension, and respectively approaching anchors on cross arms of tension towers at two ends of a tensioning section, wherein the approaching anchors must use two sets of anchor wire devices for safety;
22) the manual galloping outgoing line is used for carrying out net sealing between the new two sub-wires according to the previous net sealing method, the whole top sealing net is pushed to the far end of a preset net sealing point, and a transverse net sealing rope is anchored on the two sub-wires;
connecting two sub-leads without capping nets on the tension towers at two ends of the tension section with an insulator string by using a stringing pulley group, respectively removing the two residual old sub-leads on the left phase of the tension towers at two ends of the tension section, cutting off a tension compression joint pipe, sleeving a traction net sleeve on a side lead head of a traction field, penetrating through a pay-off pulley and connecting the pay-off pulley and a manually-unfolded traction rope to a tension integrated machine through a rotary connector; the head of the tension field side lead is connected with a traction compression joint pipe in a compression joint mode, penetrates through a pay-off pulley and is connected to a tensioner through rotation of a connector and a traction rope and a new lead which are manually unfolded;
24) finishing traction and wire changing of the remaining two sub-wires according to a traction and wire changing method of the first two sub-wires of the left phase;
25) after the line replacement of the four new sub-wires of the left phase is finished, the top sealing net is removed, and four line-releasing pulleys below the cross arm are adjusted to an accessory installation position by using a chain hoist;
26) one side of the tension tower at two sides of the tension section is hung with a back force, and the other side is hung horizontally with a high altitude tension line, and the installation of the left phase attachment of the tangent tower in the tension section, the left phase drainage setting of the tension tower and the installation of the left phase conductor spacer are completed;
27) and (4) referring to the step of changing the left phase conductor, and finishing the construction of changing the right phase conductor and the right phase ground wire in sequence.
2. The method of claim 1, wherein the old wire is used for sealing and crossing a high-speed rail to replace a ground wire, and the method comprises the following steps: in the step 1), nylon ropes with the diameter of phi 10-phi 12 are adopted in the longitudinal direction and the transverse direction of each top sealing net, the nylon ropes are woven into lattices according to the distance of 1.5-2.5m, the net ropes are knotted and fixed, the woven number is determined according to the actual construction requirement, and the length and the width of the top sealing net are determined according to the construction working condition of a crossing point.
3. The method of claim 1, wherein the old wire is used for sealing and crossing a high-speed rail to replace a ground wire, and the method comprises the following steps: in the step 4), the beaten tower reinforcing stay wire adopts 2 steel wire ropes as the stay wire of the lead, 1 steel wire rope as the stay wire of the ground wire, and the included angle of the ground anchor stay wire to the ground is less than or equal to 45 degrees.
4. The method of claim 1, wherein the old wire is used for sealing and crossing a high-speed rail to replace a ground wire, and the method comprises the following steps: in the step 5), the side phase single-wheel paying-off pulleys are hung and arranged according to normal stringing construction, four side phase single-wheel paying-off pulleys hung on the main materials of the left cross arm and the right cross arm are arranged in parallel according to 2 groups at equal intervals in the transverse direction, the transverse interval is 40-60cm, and the wheel grooves are arranged along the direction along the line.
5. The method of claim 1, wherein the old wire is used for sealing and crossing a high-speed rail to replace a ground wire, and the method comprises the following steps: in the step 6), steel wire ropes are arranged at the head parts of the left cross arm and the right cross arm, a movable pulley is arranged on the steel wire ropes, the sub-conductors are sequentially lifted and loosened by using a pulley group, the wire clamps are removed, the corresponding side phase single-wheel paying-off pulley is adjusted by a hoist so that the sub-conductors can be conveniently displaced and positioned to wheel grooves, and the positioning of the left and right phase conductors of the tangent tower in the tension section to the wheel grooves of the side phase single-wheel paying-off pulley is completed.
6. The method of claim 1, wherein the old wire is used for sealing and crossing a high-speed rail to replace a ground wire, and the method comprises the following steps: in the step 7), the four middle-phase single-wheel paying-off pulleys are transversely arranged in parallel in a straight line, and the wheel grooves are arranged along the direction along the line.
7. The method of claim 1, wherein the old wire is used for sealing and crossing a high-speed rail to replace a ground wire, and the method comprises the following steps: in the step 10), a net pulling nylon rope which follows from the top sealing net assists in slowly pulling back the top sealing net and a runaway wire outlet worker at the side of a tower where the net sealing operation on two sides of a high-speed rail starts, the pulling back distance is consistent with the grid spacing of the top sealing net nylon rope, the nodes of the top sealing net are anchored one by one until the top sealing of the whole net is finished, and finally, a transverse steel wire rope is installed at the end part of the net sealing.
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| CN113833300B (en) * | 2021-09-17 | 2023-01-20 | 广东电网有限责任公司 | Maintenance method for power transmission tower |
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| DE2813610C2 (en) * | 1978-03-30 | 1982-05-19 | Brown, Boveri & Cie Ag, 6800 Mannheim | Net suspension method |
| KR900701070A (en) * | 1988-02-01 | 1990-08-17 | 알렉산드로 사라치니 | Method and apparatus for cabling high tension power lines on a set of towers |
| CN203086060U (en) * | 2013-03-19 | 2013-07-24 | 黑河电业局 | Device for replacing overhead ground wires of high-voltage overhead power transmission line by using PPR (polypropylene random) pipe suspension |
| CN103746314A (en) * | 2013-12-30 | 2014-04-23 | 江苏省电力公司常州供电公司 | Quick hot-line by-pass jumper removing operation method for 10kV insulated power distribution line |
| CN104577875A (en) * | 2014-12-29 | 2015-04-29 | 国家电网公司 | Construction method of block crossover frame cable of power circuit |
| CN206225896U (en) * | 2016-12-10 | 2017-06-06 | 中铁二十局集团电气化工程有限公司 | A kind of crossing frame capping net system of leap high-speed railway |
| CN207098456U (en) * | 2017-06-30 | 2018-03-13 | 中国能源建设集团安徽省电力设计院有限公司 | A kind of crossover tower auxiliary cross-arm block component for being used to live across operation |
| CN108512115A (en) * | 2018-04-12 | 2018-09-07 | 浙江省送变电工程有限公司 | Utilize the block system and its installation, method for dismounting of auxiliary cross-arm spanning the transmission line |
| CN108736377B (en) * | 2018-08-16 | 2023-06-13 | 国网湖南省电力有限公司 | Live crossing system for paying-off construction crossing power line and application method thereof |
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