CN103872619A - Special method for constructing 10 kV power grid project - Google Patents
Special method for constructing 10 kV power grid project Download PDFInfo
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- CN103872619A CN103872619A CN201410132942.5A CN201410132942A CN103872619A CN 103872619 A CN103872619 A CN 103872619A CN 201410132942 A CN201410132942 A CN 201410132942A CN 103872619 A CN103872619 A CN 103872619A
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Abstract
The invention discloses a special method for constructing a 10 kV power grid project. According to the method, an initial point is measured according to a measure point position so as to arrange all control points, the range of the proportion of the height of electric poles to the depth of pole holes is 6:1 to 7:1, the electric poles close to roadsides and rock are used as fender piers, and the sizes of the fender piers are that the diameter of the upper bottoms of the fender piers is 80 cm, the diameter of the lower bottoms of the fender piers is 120 cm, and the height of the fender piers is 80 cm; concrete of a standard grade is used for pouring, the standard electric poles are used for installation, the center lines of the electric poles are in a straight line, the distance between the adjacent electric poles is 45 cm to 55 cm, a wire pull rod is perpendicular to a wire pull disc, double nuts are adopted at a connection portion, the length of the parts, exposed out of the ground, of the fender piers is 500 mm to 700 mm, and when optical fibers in wires need to be connected, and stripping is conducted according to the reserved length of a connector. According to the method, the strict construction process is adopted, a standard construction technology is provided for power grid transformation or power grid new construction, therefore, the construction period is shortened, and the construction quality is stable.
Description
Technical field
The present invention relates to a kind of method, especially relate to a kind of construction method being exclusively used in 10kV electricity power engineering, belong to power construction field.
Background technology
Electric power is the energy using electric energy as power.Invented in the 70's of 19th century, the invention of electric power and application have started industrialization climax for the second time.Since becoming 18th century of human history, one of three scientific and technological revolutions that the world occurs, from then on science and technology has changed people's life.Even the Internet era of current, we still have the demand of sustainable growth to electric power, because we have invented the product of more use electric power such as computer, household electrical appliances.Constantly the occurring of undeniable new technology makes electric power become people's necessity.The large-scale electrical power system that 20th century occurred is one of most important achievement in the human engineering history of science, the electrical production and the consume system that are made up of links such as generating, transmission of electricity, power transformation, distribution and electricity consumptions.Be the epoch of the Internet now, we still have the demand of sustainable growth to electric power, because we have invented the product of more use electric power such as computer, household electrical appliances.Conventionally the contact generating being made up of transmission of electricity, power transformation, controller switching equipment and corresponding auxiliary system and the Unified Global of electricity consumption are called to power network.Be called for short electrical network.In power transmission and distribution electric pressure, 6,10,20 kilovolts is middle pressure, 35,110,220 kilovolts is high pressure, 330,500,750 kilovolts is superhigh pressure, direct current 800, exchange 1000 kilovolts and be ultra high voltage above, power grid construction has become the main direction of China's power construction at present, and power grid construction prospect is tempting.The Eleventh Five-Year Plan period, the gross investment of China's power grid construction will exceed 1 trillion yuan.By 2010, along with building up of national grid ultra high voltage and 500 kilovolts of transregional, transnational grid networks, transregional transmission line capability will reach 7,000 ten thousand kilowatts, improve more than 5 times than 2005, account for the whole nation and add up to 11% of peak load; Electric weight reaches 3,200 hundred million kilowatt hours, increases more than 3 times than 2005, and the construction and upgrading of electrical network are important engineerings, in traditional construction, and its long construction period, and easily there is potential safety hazard.
Summary of the invention
The object of the invention is to overcome in above-mentioned existing electrical network construction and have long construction period, and easily there is the problem of potential safety hazard, design a kind of construction method being exclusively used in 10kV electricity power engineering, the method is utilized rigorous construction process, to electric network reconstruction or the newly-built construction technology that standard is provided, construction period is shortened, and construction quality is stable.
Object of the present invention is achieved through the following technical solutions: be exclusively used in the construction method to 10kV electricity power engineering, comprise the following steps:
(a) location unwrapping wire: be starting point testing according to spotting, to each control points layout, after closure is errorless, protected with concreting pile body, control the stake depth of burying and be no less than 800mm, and go along with sb. to guard him, according to coordinate points and bench mark, with the observation of total powerstation employing survey time method, get its mean value, the personnel of organizational technology carry out repetition measurement to control point and bench mark, by the spacing of 100 meters of left and right, temporary bench mark are set, and carry out closure with height datum point, mis-tie misclosure meets code requirement;
(b) excavation of foundation pit: adopt mechanical equivalent of light excavation, the clear groove of artificial cooperation, straight line pole is along line direction displacement, the cross line of angle pole, point pole, the displacement of suitable line direction all should not exceed 50mm, the depth scale scope in pole height and bar hole is 6:1 to 7:1, does fender pier near the electric pole of roadside, rock, and fender pier is of a size of upper base diameter 80cm, diameter 120cm, highly 80cm go to the bottom; Shaft bending should not exceed 1/1000 of bar length.Place ground level and examine at 1 o'clock, should be without longitudinal crack, the width of transverse crack should not exceed 0.lmm.The permissible variation of the pole-foundation hole degree of depth should be :+100mm ,-50mm.Flat by the darkest-hole behaviour permissible variation scope planted agent with base foundation pit.The degree of depth in rock foundation hole should not be less than the numerical value of design code.Two bar foundation ditches should meet the following requirements: should not exceed ± 30mm of the centre deviation that root is opened; The two bars holes degree of depth are suitable-cause.At the bottom of electric pole foundation ditch, when employing chassis, the circular groove face on chassis should be vertical with electric pole center line, answers earth filling tamping to chassis surface after centering.Permissible variation is installed on chassis, meets electric pole permissible variation regulation after should making electric pole group vertical.When pole-foundation adopts chuck, should meet the following requirements: before installation, its underpart soil layering should be backfilling and compacted; Installation site, direction, the degree of depth should meet designing requirement.Degree of depth permissible variation is ± 50mm.In the time of design no requirement (NR), upper plane separation ground should not be less than 500mm; Being connected with electric pole should be tight.
Pit backfill soil should meet a series of regulations: soil block should be smashed; The every backfill 300mm of overhead power line foundation ditch should tamp once; The foundation ditch of soft upper matter, should increase compacting number of times or take reinforcement measure when backfill; Electric pole foundation ditch after backfill soil should arrange anti-settling soil layer.Soil layer top area should not be less than near coal-mine area; Ridging height should exceed ground 300mm; In the time adopting pole vertical rod to leave landslide, landslide (packway) backfill soil should be tamped, and leaves anti-settling soil layer.
(c) build on basis: adopt the concrete of standard label to build, the template of casting concrete adopts steel form, its surface is answered whole and seam is tight, coating release agent is answered on concreting front template surface, should be immediately by the cement of remained on surface after dismounting, mortars etc. are removed clean, in the time carrying out concreting without template, should take to prevent that the foreign material such as earth from sneaking into the measure in concrete, the anchor bolt and the built-in fitting that water in underpin should be installed firmly, before installation, should remove floating rust, and threaded portion should be protected, leading role's steel of leading role's steel Inserted Foundation, should descend segment structure maggot dress centering most together with steel tower, and should be in addition temporary fixed, in building, should check at any time its position, in foundation construction, concrete mix-design should be according to raw material and construction condition such as sand, stone, cement, by the regulation of national current standard " design of common concrete proportioning technical regulation ", by calculating and examination is joined definitely, and should there is suitable margin of safety.Reserve strength value should be determined by the historical level of the concrete strength standard deviation of unit in charge of construction.Poured in place concrete should adopt mechanical packing, and should adopt mechanical agitation.
(d) electric pole group is installed: adopt standard pole to install, the center line of electric pole is straight line, distance between adjacent electric pole is 45 to 55m, the reinforced concrete pole that steel ring connects should adopt arc welding, the steel ring centering that should align, the weld bond gap of 2-5mm is stayed in centre, in the time that steel ring has bias, its mismatch should not be greater than 2mm, the suitable first spot welding of weld bond 3-4 places, then symmetrical chiasma welding, spot welding type of electrode used should be identical with the type of electrode of formal welding use, in the time that steel ring thickness is greater than 6mm, should adopt the welding of double V-groove multilayer, the joint of multilayer weld should stagger, when closing in, molten bath should be filled up, face of weld should be level and smooth thin squama shape and be connected gently with base metal, non-wrinkle, interruption, solder skip and incompletely filling sunken groove, and the crack that do not have.The base metal undercut degree of depth should not be greater than 0.5mm, and should not exceed 10% of circumference.Rain, snow, strong wind weather welding should be taked appropriate measure.Draught does not have in electric pole in welding.In the time that temperature is spent lower than-20, should take preheating measure, preheat temperature is 100-120 degree.Postwelding should make temperature slow decreasing.Forbid to use water for cooling.Whole rod bending degree after being soldered should not exceed 2/1000 of electric pole total length, should cut off welding again while exceeding.
(e) bracing wire, cross-arm are installed: distaff should be vertical with cable quadrant, junction should adopt double nut, its length that exposes above ground portion should be 500-700mm, should there be slope in bracing wire hole, when backfill soil, soil block should be smashed to rear compacting, and load bracing wire should align with the center line of line direction, subangle bracing wire should align with circuit angular bisector direction, windproof bracing wire should be vertical with line direction, and circuit list cross-arm is installed, and straight line pole should be loaded on power side; Divide pole, 90 degree angle poles and terminal should be loaded on bracing wire side, the upper and lower crooked 20mm that should not be greater than of cross-arm, left and right skew should not be greater than 20mm, the cross-arm of two bars, cross-arm should not be greater than and be connected 5/1000 of distance with the discrepancy in elevation of electric pole junction, and left and right skew should not be greater than 1/100 of cross-arm total length; In the time adopting UT shaped cable clamp and wedge clamp fixed installation, should meet the following requirements: before installing, on screw thread, should be coated with lubricant; Wire clamp hyoplastron contacts with bracing wire should be tight, stressed rear fricton-tight phenomenon, wire clamp bulging is in buttock line side, when installation, do not answer lesion wire strand sweep not have obviously loose strand, bracing wire broken end place and bracing wire main line should be fixed reliably, the buttock line length that expose at wire clamp place is 300-500mm, and buttock line later rear and this line should fasten; In the time that same group of bracing wire used two-wire press from both sides and adopt connecting plate, the direction of its buttock line end should be unified; The screw rod of UT shaped cable clamp or flower basket bolt should reveal button, and should have be not less than 1/2 screw rod screw thread length can be for tightening, after adjustment, the double nut of UT shaped cable clamp should and tight, flower basket bolt is answered sealing; In the time adopting colligation fixed installation, should meet the following requirements: bracing wire two ends should arrange thimble; Guy strand, the galvanized iron wire colligation that should adopt diameter to be not more than 3.2mm is fixed.Colligation should be neatly, closely.
(f) wire erection: when the optical fiber in wire need to continue, carry out stripping according to joint length in reserve, fixing wanting firmly after wire stripping on connector box support, carry out fibre core while continuing with heat sealing machine, the all processes of fused fiber splice should adopt OTOR monitoring, measures splicing loss, record simultaneously tap points to test point fibre core spacing from, guarantee that fibre junction average loss reaches the regulation of design document, ensure wire transmission quality, connect after fibre core with heat-shrink tube protection, optical fiber is fixed and the radius of curvature of coiling should be greater than 37.5mm at remaining drum, avoids 1.55um wavelength to produce additional attenuation, fibre core after coiling is fixed in the fine plate of dish with adhesive tape is safe, and when the encapsulation of terminal box, sealant tape should tamp, and terminal box holding screw will tighten, and ensures sealing property, in the situation that confirmation is non-leakage, can install on messenger wire, when laying, wire do not allow overbending, its bending radius must not be less than 20 times, footpath, wire place, little button and the phenomenon that kinks are not allowed, must not damage conductor protective layer, while laying wire at the large angular pole of pull, on back of the body shelves or the bar of reperusing, hang with pulley, wire is at angular pole, in the bracing wire of four directions, be provided with reserved line, reserved line plastic ripple tube boot, in the middle of reserved bow, be fixed on electric pole with soft binding, thread hook spacing is 47 to 53cm, hook and wire hasp consistent size, the remaining line length in terminal box both sides is 10 meters to 20 meters, the tossing about with reserved frame permanent joint adjacent two bars of bar by remaining line, anti-drum on remaining coil holder.Wire damages at same place, while meeting following situations, should, by injury region corner angle and No. 0 coated abrasive working for burr, can not study for a second time courses one has flunked: sub-thread lesion depths is less than 1/2 of diameter simultaneously; Steel reinforced aluminium conductor, steel reinforced aluminium wire damage sectional area are less than 5% of current-carrying part sectional area, and loss of strength is less than 4%; Monometallic twisted wire damage sectional area is less than 4%.
Adopt said method and standard, can make the cycle of electricity power engineering construction shorten, construction quality is stable, ensures useful life.
In sum, the invention has the beneficial effects as follows: the method is utilized rigorous construction process, to electric network reconstruction or the newly-built construction technology that standard is provided, construction period is shortened, and construction quality is stable.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment 1:
Be exclusively used in the construction method to 10kV electricity power engineering, comprise the following steps:
(a) location unwrapping wire: be starting point testing according to spotting, to each control points layout, after closure is errorless, protected with concreting pile body, control the stake depth of burying and be no less than 800mm, and go along with sb. to guard him, according to coordinate points and bench mark, with the observation of total powerstation employing survey time method, get its mean value, the personnel of organizational technology carry out repetition measurement to control point and bench mark, by the spacing of 100 meters of left and right, temporary bench mark are set, and carry out closure with height datum point, mis-tie misclosure meets code requirement;
(b) excavation of foundation pit: adopt mechanical equivalent of light excavation, the clear groove of artificial cooperation, straight line pole is along line direction displacement, the cross line of angle pole, point pole, the displacement of suitable line direction all should not exceed 50mm, the depth scale scope in pole height and bar hole is 6:1 to 7:1, does fender pier near the electric pole of roadside, rock, and fender pier is of a size of upper base diameter 80cm, diameter 120cm, highly 80cm go to the bottom;
(c) build on basis: adopt the concrete of standard label to build, the template of casting concrete adopts steel form, its surface is answered whole and seam is tight, coating release agent is answered on concreting front template surface, should be immediately by the cement of remained on surface after dismounting, mortars etc. are removed clean, in the time carrying out concreting without template, should take to prevent that the foreign material such as earth from sneaking into the measure in concrete, the anchor bolt and the built-in fitting that water in underpin should be installed firmly, before installation, should remove floating rust, and threaded portion should be protected, leading role's steel of leading role's steel Inserted Foundation, should descend segment structure maggot dress centering most together with steel tower, and should be in addition temporary fixed, in building, should check at any time its position,
(d) electric pole group is installed: adopt standard pole to install, the center line of electric pole is straight line, distance between adjacent electric pole is 45 to 55m, the reinforced concrete pole that steel ring connects should adopt arc welding, the steel ring centering that should align, the weld bond gap of 2-5mm is stayed in centre, in the time that steel ring has bias, its mismatch should not be greater than 2mm, the suitable first spot welding of weld bond 3-4 places, then symmetrical chiasma welding, spot welding type of electrode used should be identical with the type of electrode of formal welding use, in the time that steel ring thickness is greater than 6mm, should adopt the welding of double V-groove multilayer, the joint of multilayer weld should stagger, when closing in, molten bath should be filled up,
(e) bracing wire, cross-arm are installed: distaff should be vertical with cable quadrant, junction should adopt double nut, its length that exposes above ground portion should be 500-700mm, should there be slope in bracing wire hole, when backfill soil, soil block should be smashed to rear compacting, and load bracing wire should align with the center line of line direction, subangle bracing wire should align with circuit angular bisector direction, windproof bracing wire should be vertical with line direction, and circuit list cross-arm is installed, and straight line pole should be loaded on power side; Divide pole, 90 degree angle poles and terminal should be loaded on bracing wire side, the upper and lower crooked 20mm that should not be greater than of cross-arm, left and right skew should not be greater than 20mm, the cross-arm of two bars, cross-arm should not be greater than and be connected 5/1000 of distance with the discrepancy in elevation of electric pole junction, and left and right skew should not be greater than 1/100 of cross-arm total length; The depth of burying of stay block, in the time of design no requirement (NR), should meet the following requirements: employing pendant line, should not be less than 1/6 of bracing wire column length; Employing nothing pendant line, should determine by its stressing conditions.
Stay block should be to tension force 10 degree one 20 degree that tilt in the other direction.Pendant line and stay block angle should not be less than 30 degree.The position of pendant line upper end fixing point should be 250mm apart from the distance on stay block top.
When pendant line adopts galvanized iron wire colligation fixing, minimum coiling length should conform with the regulations.In the time installing many bracing wires on a base electric pole, the stressed of each bracing wire should be consistent.Adopt the bracing wire of galvanized iron wire plying composition, its number of share of stock should not be less than three strands.The sub-thread diameter of galvanized iron wire should not be less than 4.0mm, stranded should even, stressedly equating, should not occur the phenomenon that knots.The bracing wire of the galvanized iron wire of plying composition can adopt diameter to be not less than the colligation of 3.2mm galvanized iron wire and fix, and colligation should be neatly tight, and coiling length is: 5 strands and following person, upper end: 200mm, middle-end has the two ends of insulator: 200mm, under twine 150mm, flower twines 250mm, above twines l00mm.In the time that the galvanized iron wire bracing wire employing of plying composition self is fastened, winding should be neatly tight, coiling length: 3 strands should not be less than 80mm, and 5 strands should not be less than 150mm.The bracing wire of concurrent is in the time of installing insulator, and in disconnected bracing wire situation, insulation in guy gives should not be less than 2.5m apart from ground.
The installation of top (support) bar, should meet the following requirements: push rod bottom buried depth should not be less than 0.5m, and is provided with settlement prevention; And angle should meet design requirement between mobile jib, permissible variation is ± 5 degree; Being connected with mobile jib should be closely, firmly.
(f) wire erection: when the optical fiber in wire need to continue, carry out stripping according to joint length in reserve, fixing wanting firmly after wire stripping on connector box support, carry out fibre core while continuing with heat sealing machine, the all processes of fused fiber splice should adopt OTOR monitoring, measures splicing loss, record simultaneously tap points to test point fibre core spacing from, guarantee that fibre junction average loss reaches the regulation of design document, ensure wire transmission quality, connect after fibre core with heat-shrink tube protection, optical fiber is fixed and the radius of curvature of coiling should be greater than 37.5mm at remaining drum, avoids 1.55um wavelength to produce additional attenuation, fibre core after coiling is fixed in the fine plate of dish with adhesive tape is safe, and when the encapsulation of terminal box, sealant tape should tamp, and terminal box holding screw will tighten, and ensures sealing property, in the situation that confirmation is non-leakage, can install on messenger wire, when laying, wire do not allow overbending, its bending radius must not be less than 20 times, footpath, wire place, little button and the phenomenon that kinks are not allowed, must not damage conductor protective layer, while laying wire at the large angular pole of pull, on back of the body shelves or the bar of reperusing, hang with pulley, wire is at angular pole, in the bracing wire of four directions, be provided with reserved line, reserved line plastic ripple tube boot, in the middle of reserved bow, be fixed on electric pole with soft binding, thread hook spacing is 47 to 53cm, hook and wire hasp consistent size, the remaining line length in terminal box both sides is 10 meters to 20 meters, the tossing about with reserved frame permanent joint adjacent two bars of bar by remaining line, anti-drum on remaining coil holder.
In the time adopting winding to process, should meet the following requirements: the line thigh of impaired injury should be processed smooth; Should select with wire is winding material with the single cord of metal, and its diameter should not be less than 2mm; Winding center should be positioned at damage the most seriously to be located, and winding should be tight, and damaged part should all cover, and its length should not be less than l00mm.
In the time that pre-twisted wire repairing is studied for a second time courses one has flunked in employing, should meet the following requirements: the line thigh of a, impaired injury should be processed smooth; B, study for a second time courses one has flunked preformed armor rods length and should not be less than 3 pitches, maybe should meet the regulation in existing national standard " electric armour clamp " preformed armor rods; C, the center of studying for a second time courses one has flunked preformed armor rods should be positioned at damage the most seriously to be located, and contacts with wire closely, and injury region should all cover.
The wire lightning conducter that adopts splicing sleeve to connect, deals with the regulation of closing existing national standard " electric armour clamp ", and holding after connection puts forth effort to calculate pull-off force ratio with the guarantee of former wire or lightning conducter, should meet the following requirements: continuous-tube is not less than 95%; Bolt type strain clamp is not less than 90%.
Before wire is connected with tube connector, should remove the dirt of conductive line surfaces and tube connector inwall, removing length should be 2 times of coupling part.The matter contact-making surface of connecting portion, should be coated with one deck electric power and check fat, removes surface film oxide with finer wire brush, retains coating, carries out crimping.
Wire adopts pincers pressure to be connected with splicing sleeve, should meet the following requirements: the specification of splicing sleeve model and wire should be supporting; Pincers are pressed rear conducting wire end exposed length, should not be less than 20mm, and conducting wire end wiring should retain; Splicing sleeve flexibility after crimping should not be greater than 2% of pipe range, answers alignment while having obvious bending; Splicing sleeve after crimping or after the alignment crackle that do not have; Sound connects near the wire rear splicing sleeve two ends phenomenon such as lantern, cramp that do not have; Exit, splicing sleeve two ends, commissure and exposed parts after crimping, should brushing electric force compounded grease; Permissible error after pressure, aluminium stranded conductor cramp joint pipe is ± 1.0mm that steel reinforced aluminium conductor cramp joint pipe is ± 0.5mm.
When overhead power line adopts suspension clamp, insulator is plane vertically, and in particular cases, it,, at the inclination angle along line direction and upright position, should not exceed 5 degree.The stockbridge damper that the wire of overhead power line or lightning conducter are installed, should be vertical with ground level, should not be greater than ± 30mm of the error of its mounting distance.Overhead power line is in the time adopting parallel groove clamp to connect drainage thread, and wire clamp quantity should not be less than 2.Joint face should be smooth, bright and clean.Wire and parallel groove clamp groove planted agent remove oxide-film, are coated with electric force compounded grease.The wiring that colligation is used, should select and the single cord of wire with metal, and its diameter should not be less than 2.0mm.Clearance after installing between the wire of circuit and bracing wire, electric pole or framework, when 110kV, should be less than 800mm.
Adopt the electrical network that aforesaid way carries out to construct, can improve the efficiency of construction of electrical network, its cycle is short, can ensure the useful life of electrical network.
The above; it is only preferred embodiment of the present invention; not the present invention is done to any pro forma restriction, any simple modification, equivalent variations that every foundation technology of the present invention, method are done above embodiment in fact, within all falling into protection scope of the present invention.
Claims (1)
1. be exclusively used in the construction method to 10kV electricity power engineering, it is characterized in that, comprise the following steps:
(a) location unwrapping wire: be starting point testing according to spotting, to each control points layout, after closure is errorless, protected with concreting pile body, control the stake depth of burying and be no less than 800mm, and go along with sb. to guard him, according to coordinate points and bench mark, with the observation of total powerstation employing survey time method, get its mean value, the personnel of organizational technology carry out repetition measurement to control point and bench mark, by the spacing of 100 meters of left and right, temporary bench mark are set, and carry out closure with height datum point, mis-tie misclosure meets code requirement;
(b) excavation of foundation pit: adopt mechanical equivalent of light excavation, the clear groove of artificial cooperation, straight line pole is along line direction displacement, the cross line of angle pole, point pole, the displacement of suitable line direction all should not exceed 50mm, the depth scale scope in pole height and bar hole is 6:1 to 7:1, does fender pier near the electric pole of roadside, rock, and fender pier is of a size of upper base diameter 80cm, diameter 120cm, highly 80cm go to the bottom;
(c) build on basis: adopt the concrete of standard label to build, the template of casting concrete adopts steel form, its surfacing and seam are tight, coating release agent is answered on concreting front template surface, should be immediately by the cement of remained on surface after dismounting, mortars etc. are removed clean, in the time carrying out concreting without template, take to prevent that the foreign material such as earth from sneaking into the measure in concrete, the anchor bolt and the built-in fitting that water in underpin should be installed firmly, before installation, should remove floating rust, and threaded portion should be protected, leading role's steel of leading role's steel Inserted Foundation, should descend segment structure maggot dress centering most together with steel tower, and should be in addition temporary fixed, in building, should check at any time its position,
(d) electric pole group is installed: adopt standard pole to install, the center line of electric pole is straight line, distance between adjacent electric pole is 45 to 55m, the reinforced concrete pole that steel ring connects should adopt arc welding, the steel ring centering that should align, the weld bond gap of 2-5mm is stayed in centre, in the time that steel ring has bias, its mismatch should not be greater than 2mm, the suitable first spot welding of weld bond 3-4 places, then symmetrical chiasma welding, spot welding type of electrode used should be identical with the type of electrode of formal welding use, in the time that steel ring thickness is greater than 6mm, should adopt the welding of double V-groove multilayer, the joint of multilayer weld should stagger, when closing in, molten bath should be filled up,
(e) bracing wire, cross-arm are installed: distaff should be vertical with cable quadrant, junction should adopt double nut, its length that exposes above ground portion should be 500-700mm, should there be slope in bracing wire hole, when backfill soil, soil block should be smashed to rear compacting, and load bracing wire should align with the center line of line direction, subangle bracing wire should align with circuit angular bisector direction, windproof bracing wire should be vertical with line direction, and circuit list cross-arm is installed, and straight line pole should be loaded on power side; Divide pole, 90 degree angle poles and terminal should be loaded on bracing wire side, the upper and lower crooked 20mm that should not be greater than of cross-arm, left and right skew should not be greater than 20mm, the cross-arm of two bars, cross-arm should not be greater than and be connected 5/1000 of distance with the discrepancy in elevation of electric pole junction, and left and right skew should not be greater than 1/100 of cross-arm total length;
(f) wire erection: when the optical fiber in wire need to continue, carry out stripping according to joint length in reserve, fixing wanting firmly after wire stripping on connector box support, carry out fibre core while continuing with heat sealing machine, the all processes of fused fiber splice should adopt OTOR monitoring, measures splicing loss, record simultaneously tap points to test point fibre core spacing from, guarantee that fibre junction average loss reaches the regulation of design document, ensure wire transmission quality, connect after fibre core with heat-shrink tube protection, optical fiber is fixed and the radius of curvature of coiling should be greater than 37.5mm at remaining drum, avoids 1.55um wavelength to produce additional attenuation, fibre core after coiling is fixed in the fine plate of dish with adhesive tape is safe, and when the encapsulation of terminal box, sealant tape should tamp, and terminal box holding screw will tighten, and ensures sealing property, in the situation that confirmation is non-leakage, can install on messenger wire, when laying, wire do not allow overbending, its bending radius must not be less than 20 times, footpath, wire place, little button and the phenomenon that kinks are not allowed, must not damage conductor protective layer, while laying wire at the large angular pole of pull, on back of the body shelves or the bar of reperusing, hang with pulley, wire is at angular pole, in the bracing wire of four directions, be provided with reserved line, reserved line plastic ripple tube boot, in the middle of reserved bow, be fixed on electric pole with soft binding, thread hook spacing is 47 to 53cm, hook and wire hasp consistent size, the remaining line length in terminal box both sides is 10 meters to 20 meters, the tossing about with reserved frame permanent joint adjacent two bars of bar by remaining line, anti-drum on remaining coil holder.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832781A (en) * | 2021-02-25 | 2021-05-25 | 中铁二十五局集团第五工程有限公司 | Tunnel construction process |
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| CN102359123A (en) * | 2011-07-21 | 2012-02-22 | 济南城建集团有限公司 | Cast-in-place concrete cable conduit construction method |
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Application publication date: 20140618 |