CN101304148A - Construction method for underground grounded screen - Google Patents
Construction method for underground grounded screen Download PDFInfo
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- CN101304148A CN101304148A CNA200810150296XA CN200810150296A CN101304148A CN 101304148 A CN101304148 A CN 101304148A CN A200810150296X A CNA200810150296X A CN A200810150296XA CN 200810150296 A CN200810150296 A CN 200810150296A CN 101304148 A CN101304148 A CN 101304148A
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Abstract
The invention relates to a subway grounding grid construction method, which comprises the following steps: the accurate positions for the installation of a horizontal grounding body and a vertical grounding body are determined; ditches are excavated; the horizontal and the vertical grounding bodies are produced and installed; grounding outlet wires are installed; the ditches are backfilled and tamped; in the process of the production and installation of the horizontal grounding body and the vertical grounding body, both the horizontal grounding bodies and the horizontal grounding body and the vertical grounding body are connected by heat release weld that is improved; the horizontal grounding body uses copper bars; the vertical grounding body uses copper tubes; the grounding grid grounding outlet wires use the copper bars. The subway grounding grid construction method has the advantages of high construction efficiency and excellent welding quality, fully guaranteeing the quality of a subway grounding grid project, and effectively preventing the phenomenon of the theft of grounding outlet wires after the installation method of the subway grounding grid grounding outlet wires is improved.
Description
Technical field
The invention belongs to the subway work field, be specifically related to a kind of construction method for underground grounded screen.
Background technology
Ground connection generally is divided into working earthing, protective earthing, lightning protection, anti-static grounding in the construction project at present, and the underground grounded screen construction belongs to working earthing and protective earthing.
General subway station ground network construction characteristic is:
Construction material: adopt zinc-coated flat steel sheet, angle steel etc., physicochemical characteristicss such as its conductivity, thermal conductivity, corrosion resistance and ductility have much room for improvement;
Construction method: adopt arc welding, the arc welding tool using is electric welding machine, welding rod, welding gun etc., needs external power supply, complicated operation, and welding quality is unsecured; The underground grounded screen ground outlet exposes owing to copper bar, and is often stolen in the work progress;
The construction pattern: the subway station is many, and battle line is long, and the job site disperses, and construction needs scheduling back and forth, and construction cost strengthens, and efficiency of construction is low in the unit interval.
Summary of the invention
The objective of the invention is to be at the deficiencies in the prior art, provide a kind of efficiency of construction height, the construction method for underground grounded screen that welding quality is guaranteed and helps safeguarding.
For achieving the above object, the technical solution used in the present invention is: a kind of construction method for underground grounded screen may further comprise the steps: determine the accurate position that horizontal grounding body and vertical junction terrain are installed; Channel excavation; Horizontal grounding body and vertical junction terrain are made and are installed; The ground network ground outlet is installed; The trench backfill compacting, in described horizontal grounding body and making of described vertical junction terrain and installation process, described horizontal grounding body adopts copper bar, and the vertical junction terrain adopts copper pipe, and copper bar is adopted in the ground network ground outlet; All adopt the heat release welding after improving to be connected between the described horizontal grounding body and between horizontal grounding body and the vertical junction terrain; Heat release welding after the described improvement may further comprise the steps:
1) sets up small mould jig with upper strata protective cover and side shield; Described small mould jig comprises three fixed supports, and end platform is installed in described fixed support bottom, and the fixed support upper end connects the lifting steel pipe, is provided with the rain side plate that keeps out the wind between two fixed supports, described lifting steel pipe upper end roof supporting;
2) weld required model mould with the heat release of capillary brush cleaning, remove die surface and inner aqueous vapor with heater heats;
3) earlier with gas tank baking horizontal grounding body and vertical junction terrain, flush terrain and vertical junction terrain to its any surface finish free from admixture with the steel brush swabbing, then the horizontal grounding body that has cleaned or the horizontal grounding body that has cleaned and vertical junction terrain are put in the mould, the interface of inspection horizontal grounding body or vertical junction terrain and mould has seamless, with the cotton shutoff of high temperature slit;
4) clean steel dish is put into the bottom of mould reaction chamber, blocked outlet under the reaction chamber;
5) solder flux is poured in the mould reaction chamber into compacting slightly;
6) pyrophoric powder is sprinkled upon the solder flux surface, on die lip, stays pyrophoric powder;
7) cover the fusible pattern lid, aim at the pyrophoric powder igniting of die lip with burning torch;
8) treat that described mould reaction chamber reacted after 20 seconds, open the fusible pattern lid, peel of mould;
The upper end is equipped with bed course after the installation of described horizontal grounding body, and the bed course upper end is equipped with base plate; Base plate is passed in described ground network ground outlet.
Described copper bar is that copper pipe is a copper tube with red copper row.
Adopt overlap welding between described horizontal grounding body and the vertical junction terrain.
Weld apart from 5-8mm between described horizontal grounding body and the vertical junction terrain.
The exposed parts copper bar of described ground network ground outlet on base plate adopts protection tube that copper bar integral body is protected, and fills sand in the protection tube pipe and seals with epoxy resin.
Described protection tube is non magnetic steel pipe.
The weld mold that heat release welding between described horizontal grounding body and the vertical junction terrain is adopted is covered by fusible pattern, the middle figure of two symmetries and mold bottom are formed, the middle figure of described two symmetries separates, figure separates with mold bottom in described, described mold bottom one side is provided with the circular arc cylindrical recesses that is used to place the vertical junction terrain, described circular arc cylindrical recesses upper end is communicated with the middle figure of two symmetries, figure and mold bottom junction middle part is the welding chamber in described, described welding chamber has the logical groove of wearing that is used to place the horizontal grounding body that is communicated with the die body outer surface, oblique top, described welding chamber is the reaction chamber that is used to place scolder, and described reaction chamber top is an open-top.
The present invention compared with prior art has the following advantages:
Ground network adopts copper tube and red copper row, and material resistance is little, and ground connection is effective; The heat release welding after improving is adopted in underground grounded screen welding, does not need external any water power equal energy source, simple to operate, convenient, safety, and it is good to weld no rosin joint and welding quality; Underground grounded screen ground outlet installation method has effectively prevented the phenomenon that ground outlet is stolen after improving.
Description of drawings
Fig. 1 is the subway station structural representation that underground grounded screen is installed.
Fig. 2 is the structural representation of the middle-size and small-size mould jig of the inventive method.
Fig. 3 is the structural representation of ground outlet in the inventive method.
Fig. 4 is that the position the during welding of copper bar and copper pipe concerns schematic diagram in the inventive method.
Fig. 5 is the structural representation after the welding of copper bar and copper pipe in the inventive method.
Fig. 6 is an exothermic welding mould structural representation in the inventive method.
Fig. 7 is an exothermic welding mould external structure schematic diagram in the inventive method.
Description of reference numerals:
The 1-copper bar; The 2-protection tube; The 3-sand;
4-epoxy resin; The 5-copper pipe; The 6-pad;
7-horizontal grounding body; 8-vertical junction terrain; 9-earth electrode lead-out wire;
The 10-seal plate; 11-water-proof concrete base plate; The 12-air channel;
13-platform plate; The 14-bed course; The 15-fixed support;
Platform at the bottom of the 16-; 17-lifting steel pipe; The 18-rain side plate that keeps out the wind;
The 19-top board; 21-fusible pattern lid; The 22-pyrophoric powder;
The 23-solder flux; 24-steel dish; 25-welding chamber;
The 27-open-top; Figure among the 28-; The 29-mold bottom;
The 30-reaction chamber; The 31-die lip; The logical groove of wearing of 32-;
The 33-breach.
Embodiment
A kind of construction method for underground grounded screen may further comprise the steps: determine the accurate position that horizontal grounding body 7 and vertical junction terrain 8 are installed; Channel excavation; Horizontal grounding body 7 and vertical junction terrain 8 are made and are installed; Ground outlet 9 is installed; The trench backfill compacting.
As shown in Figure 1, there is vertical junction terrain 8 vertically downward at horizontal grounding body 7 two ends, horizontal grounding body 7 upper ends connect earth electrode lead-out wire 9 vertically upward, horizontal grounding body 7 adopts plain earthen backfill, horizontal grounding body 7 upper ends are bed course 14, bed course 14 upper ends are provided with base plate, described base plate is a water-proof concrete base plate 11, earth electrode lead-out wire 9 in 11 layers of water-proof concrete base plates is provided with seal plate 10, water-proof concrete base plate 11 is put on the shelf and is provided with platform plate 13, is provided with air channel 12 between platform plate 13 and the water-proof concrete base plate 11.
(1) determines the accurate position that horizontal grounding body 7 and vertical junction terrain 8 are installed: at first determine the accurate position that horizontal grounding body 7 and vertical junction terrain 8 are installed before the construction, adopt fixed stake and setting-out to carry out mark at the scene according to design drawing and on-site actual situations.Position measurement need together be carried out together with construction unit, designing unit, supervisor and civil engineering contractor, and whether detect the installation site has with construction such as civil engineering reversed beam and conflict; Use survey meter to survey the underground utilities distribution situation, detect ground network and vertical junction terrain 8 positions are installed especially whether have and conflict, in case destroy underground utilities during boring with underground utilities; To should rationally dodge after clashing.To the test of job site soil sampling, determine whether to take plain earthen backfill or displacement soil.Prepare installation drawing, construction tool and associated materials.
(2) channel excavation: location survey finishes, and after the earthing material arrival is up to the standards and preparation finishes, can carry out the excavation of horizontal grounding body groove, and the ditch section is last wide 600mm, and following wide by 400, degree of depth 700mm's is trapezoidal; Vertical junction terrain channel excavation ditch section is last wide 800mm, following wide 600mm, and degree of depth 700mm's is trapezoidal;
Groove and drainage of foundation pit: if infiltration occurs, then adopt deep water pump to carry out draining, the water of discharging is guided to beyond the foundation ditch, require to cooperate according to subway work water is discharged into assigned address by civil engineering contractor with plastic tube.
(3) horizontal grounding body 7 is installed: after groove satisfies the requirements, horizontal grounding body 7 is put into groove and heat release welding as requested, welding guarantees solid and reliable, horizontal grounding body 7 is laid in longitudinal groove central authorities, for guaranteeing that horizontal grounding body 7 is among the backfill soil, with finger stone different parts is supported, make it exceed the about 50mm of bottom of trench, so that backfill soil wraps the horizontal grounding body.The 7 welding back self checks of horizontal grounding body behind qualified, the no sealing-off of self check, the rosin joint, are submitted a report asking for supervising engineer's site inspection.
(4) vertical junction terrain 8 is installed: after vertical hole drill is good vertical junction terrain 8 is put into the hole, adjust copper tube to the center, hole, the hand steered ground connection steel pipe of a people, the former earthen backfill of an other human; If in the hole water is arranged, water must be taken away; Higher as local soil resistivity, for earth resistance is met design requirement, to use the corrosion-prevention physical grounded resistance reducing agent that vertical junction terrain 8 is filled, should guarantee that vertical junction terrain 8 is among the slurry, and resistance reducing agent fully contacts with vertical junction terrain 8 and peripheral soil, treats to tamp with the plain earthen backfill of low-resistivity soil after the resistance reducing agent initial set again; With vertical junction terrain 8 and 7 welding of horizontal grounding body, submit a report asking for the qualified back backfill of supervising engineer's site inspection groove then.
(5) ground outlet 9 is installed: measures and carry out ground outlet 9 after in place and weld simultaneously, install with horizontal grounding body 7, redundance carries out shallow-layer and covers, and cooperation civil engineering contractor finishes final making when treating underground station bed course, base plate or standing wall construction on the ground.
(6) backfill: the supervising engineer can backfill after to concealed work (comprising level, vertical junction terrain and ground outlet) passed examination, backfill soil adopts spoil in principle, be the original soil that channel excavation goes out, the Powdered strong-weathered rock backfill of selecting clay or low soil resistivity for use around the earth electrode.If the test of sampling soil resistivity does not reach designing requirement, then ship plain soil displacement original soil and carry out backfill from other places, original soil is transported the job site according to relevant regulations.Tamp after the trench backfill, tamp again after the natural subsidence one time.
(7) level in surplus side's foundation ditch: the earth electrode construction finishes, as requested after the backfill, smooth, unnecessary stone cleaning is carried out in the unnecessary earthwork in the scope of operation appear on the scene in foundation ditch, make operation foundation ditch surface level, the uneven phenomenon of no concave-convex is for the construction of next step bed course of civil engineering creates conditions.
The horizontal grounding body 7 that underground grounded screen is implemented adopts the copper bar processing and fabricating of 50 * 5mm specification and 50 * 4mm specification, the copper bar of 50 * 5mm specification be used for the ground connection looped network outer and middle have the ground outlet outlet combine to horizontal connecting band, the copper bar of 40 * 4mm specification is used for no ground outlet outlet in the middle of the ground connection looped network comprehensive to horizontal connecting band.Vertical junction terrain 8 adopts the copper tube processing and fabricating of external diameter 50mm, wall thickness 4mm, long 2500mm.Between the horizontal grounding body 7, all adopt the heat release welding to be connected between horizontal grounding body 7 and the vertical junction terrain 8.
(1) blanking: at first determine horizontal grounding body 7 batching length before the construction according to design drawing and on-site actual situations, to processing red copper material prepare burden cutting or welding, according to each station consumption blanking, the material for preparing is separated placement, and the used position of mark to supplied materials.
(2) processing: horizontal grounding body 7 and vertical junction terrain 8 are carried out time processing in the material storehouse, comprise cutting and welding etc.; The accessory of butt joint is simultaneously processed.Copper material is soft in addition, and the material to the part distortion after material is shown up carries out correction process.
(3) lay: after groove and hole construction satisfy the requirements, horizontal grounding body 7 and vertical junction terrain 8 are installed to the design position according to drawing.
(4) welding in the groove: the installation of horizontal grounding body 7 and vertical junction terrain 8 all needs the heat release welding manner to be connected, and material carries out the part welding job when removing time processing, mainly still is applied in the groove and welds, and welding procedure will be described in detail below.The welding of horizontal grounding body 7 and vertical junction terrain 8 is generally carried out at channel bottom, and a long horizontal grounding body 7 can integral body be put into groove after ditch external welding moulding, and the horizontal grounding body 7 after the welding and the pad of vertical junction terrain 8 will confirm to carry out under the qualified situation mopping the supervising engineer.
(5) installation in position: horizontal grounding body 7 is laid in longitudinal groove central authorities, is among the backfill soil for guaranteeing horizontal grounding body 7, with finger stone different parts is supported, and makes it exceed the about 50mm of bottom of trench, so that backfill soil wraps earth electrode.Vertical junction terrain 8 is laid in the center, hole of boring.
(6) hidden: as to carry out strict quality examination after above work is finished, especially check that sealing-off and rosin joint phenomenon do not appear in pad, submit a report asking for on-the-spot supervising engineer after self check is qualified and check, confirm that through the supervising engineer qualified to carry out backfill after not needing to correct hidden.
As Fig. 1, shown in Figure 3, the exposed parts copper bar 1 of described ground network ground outlet 9 on water-proof concrete base plate 11, the whole 2 pairs of copper bars 1 of protection tube that adopt are protected, and fill sand 3 in the protection tube 2 and seal with epoxy resin 4.Described protection tube 2 is non magnetic steel pipe.Adopt protection tube 2 to protect, both helped the construction in later period of copper bar 1, prevented the behavior of theft copper bar 1 simultaneously again.
Adopt the heat release welding after improving to connect between the described horizontal grounding body 7, between horizontal grounding body 7 and the vertical junction terrain 8.
As Fig. 6, shown in Figure 7, the weld mold that heat release welding between horizontal grounding body 7 and the vertical junction terrain 8 is adopted is by fusible pattern lid 21, the middle figure 28 of two symmetries and mold bottom 29 are formed, the middle figure 28 of two symmetries is separable, middle figure 28 can separate with mold bottom 29, mold bottom 29 1 sides are provided with the circular arc cylindrical recesses, described circular arc cylindrical recesses upper end is communicated with the middle figure 28 of two symmetries, middle figure 28 and middle part, mold bottom 29 junctions are welding chamber 25, welding chamber 25 has the logical groove 32 of wearing that is used to place copper bar 1 that is communicated with the die body outer surface, 25 oblique tops, welding chamber are the reaction chamber 30 that is used to place scolder, and reaction chamber 30 tops are open-top 27.
During welding, copper bar 1 is put into the logical groove 32 of wearing, copper pipe 5 is placed on mould arc limit one side, in the middle of open-top 27 and welding chamber 25, place steel dish 24, the reaction chamber 30 inner solder flux 23 of placing, pyrophoric powder 22 is placed on open-top 27 upper stratas, covers fusible pattern lid 21, reserves some pyrophoric powders 22 at fusible pattern lid 21 and die body top die lip 31 places.
Middle figure 28 is provided with the breach 33 that is used for the clamping of weld mold anchor clamps.
Described heat release welding may further comprise the steps:
1) sets up small mould jig with upper strata protective cover and side shield;
As shown in Figure 2, the small mould jig comprises that three fixed supports 15, fixed support 15 bottoms install end platform 16, fixed support 15 upper ends and connect between lifting steel pipe 17, two fixed supports 15 and be provided with 18, three lifting steel pipes of rain side plate, the 17 upper end roof supportings 19 that keep out the wind.
2) with the required model mould of capillary brush cleaning, remove die surface and inner potential aqueous vapor with heater heats;
3) earlier with gas tank baking horizontal grounding body 7 and vertical junction terrain 8, flush terrain 7 and vertical junction terrain 8 to its any surface finish free from admixture with the steel brush swabbing, then the horizontal grounding body 7 that has cleaned or the horizontal grounding body 7 that has cleaned and vertical junction terrain 8 are put in the mould, the interface of inspection horizontal grounding body 7 or vertical junction terrain 8 and mould has seamless, with the cotton shutoff of high temperature slit;
4) clean steel dish 24 is put into the bottom of mould reaction chamber 30, blocked 30 times outlets of reaction chamber;
5) open the respective model solder flux and pour in the reaction chamber 30 compacting slightly into; The solder flux of 200 gram/bags is adopted in welding between 50 * 5mm specification copper bar 1 of horizontal grounding body 7, and the solder flux of 150 gram/bags is adopted in welding between 50 * 4mm specification copper bar 1; It between horizontal grounding body 7 and the vertical junction terrain 8 solder flux of the two bag of 200 gram/bag of welding employing between copper bar 1 and the copper pipe 5;
6) open pyrophoric powder 22 and be sprinkled upon the solder flux surface, stay pyrophoric powder 22 to spill on die lip 31;
7) cover fusible pattern lid 21, operating personnel have worn mouth mask, withdraw mould openings the place ahead personnel and combustible object, aim at pyrophoric powder 22 igniting of die lip 31 again with burning torch;
8) reaction was opened fusible pattern lid 21 after 20 seconds, peel of mould and pad, and in time cleaning mold is put into the tool box in order to use next time.
As Fig. 4, shown in Figure 5, be that overlap welding is adopted in welding between copper bar 1 and the copper pipe 5 between horizontal grounding body 7 and the vertical junction terrain 8, apart from 5-8mm, put into exothermic welding mould and carry out the heat release welding between copper pipe 5 and the copper bar 1, the welding back forms a heat release welding pad 6.Original method need be inserted into copper pipe 5 centres joint with copper bar 1 and weld cutting in the middle of the copper pipe 5, and weld mold is bad to be done, and the welding difficulty is bigger, and quality can't guarantee.Adopt overlap welding, low, the easy production of the mould cost after the improvement, simple to operate, shorten weld time, welding quality is easy to control, die life is long, solder flux is saved, construction brings conveniently greatly to ground network, has reduced cost, increase engineering profit point.
Claims (7)
1. a construction method for underground grounded screen may further comprise the steps: determine the accurate position that horizontal grounding body and vertical junction terrain are installed; Channel excavation; Horizontal grounding body and vertical junction terrain are made and are installed; The ground network ground outlet is installed; The trench backfill compacting is characterized in that described horizontal grounding body adopts copper bar in described horizontal grounding body and making of described vertical junction terrain and installation process, and the vertical junction terrain adopts copper pipe, and copper bar is adopted in the ground network ground outlet; All adopt the heat release welding after improving to be connected between the described horizontal grounding body and between horizontal grounding body and the vertical junction terrain; Heat release welding after the described improvement may further comprise the steps:
1) sets up small mould jig with upper strata protective cover and side shield; Described small mould jig comprises three fixed supports, and end platform is installed in described fixed support bottom, and the fixed support upper end connects the lifting steel pipe, is provided with the rain side plate that keeps out the wind between two fixed supports, described lifting steel pipe upper end roof supporting;
2) weld required model mould with the heat release of capillary brush cleaning, remove die surface and inner aqueous vapor with heater heats;
3) earlier with gas tank baking horizontal grounding body and vertical junction terrain, flush terrain and vertical junction terrain to its any surface finish free from admixture with the steel brush swabbing, then the horizontal grounding body that has cleaned or the horizontal grounding body that has cleaned and vertical junction terrain are put in the mould, the interface of inspection horizontal grounding body or vertical junction terrain and mould has seamless, with the cotton shutoff of high temperature slit;
4) clean steel dish is put into the bottom of mould reaction chamber, blocked outlet under the reaction chamber;
5) solder flux is poured in the mould reaction chamber into compacting slightly;
6) pyrophoric powder is sprinkled upon the solder flux surface, on die lip, stays pyrophoric powder;
7) cover the fusible pattern lid, aim at the pyrophoric powder igniting of die lip with burning torch;
8) treat that described mould reaction chamber reacted after 20 seconds, open the fusible pattern lid, peel of mould;
The upper end is equipped with bed course after the installation of described horizontal grounding body, and the bed course upper end is equipped with base plate, and base plate is passed in described ground network ground outlet.
2. construction method for underground grounded screen according to claim 1 is characterized in that described copper bar for arranging with red copper, and copper pipe is a copper tube.
3. construction method for underground grounded screen according to claim 1 is characterized in that adopting overlap welding between described horizontal grounding body and the vertical junction terrain.
4. construction method for underground grounded screen according to claim 3 is characterized in that welding apart from 5-8mm between described horizontal grounding body and the vertical junction terrain.
5. construction method for underground grounded screen according to claim 1; it is characterized in that the exposed parts copper bar of described ground network ground outlet on base plate; adopt protection tube that copper bar integral body is protected, fill sand in the protection tube pipe and seal with epoxy resin.
6. construction method for underground grounded screen according to claim 5 is characterized in that described protection tube is non magnetic steel pipe.
7. construction method for underground grounded screen according to claim 1, it is characterized in that the weld mold that the heat release welding between described horizontal grounding body and the vertical junction terrain is adopted is covered by fusible pattern, the middle figure of two symmetries and mold bottom are formed, the middle figure of described two symmetries separates, figure separates with mold bottom in described, described mold bottom one side is provided with the circular arc cylindrical recesses that is used to place the vertical junction terrain, described circular arc cylindrical recesses upper end is communicated with the middle figure of two symmetries, figure and mold bottom junction middle part is the welding chamber in described, described welding chamber has the logical groove of wearing that is used to place the horizontal grounding body that is communicated with the die body outer surface, oblique top, described welding chamber is the reaction chamber that is used to place scolder, and described reaction chamber top is an open-top.
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| CN102856671B (en) * | 2012-04-25 | 2015-03-11 | 辽宁省电力有限公司丹东供电公司 | Environment-friendly leak-proof moisturizing grounding device and construction method |
| CN103065703B (en) * | 2012-11-29 | 2015-09-16 | 郑州市永逸降阻材料有限公司 | Corrosion-free conduction resistance-lowering material and earth device without maintenance thereof |
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| CN104577364A (en) * | 2015-01-21 | 2015-04-29 | 中铁二十一局集团第二工程有限公司 | Small-resistance-value grounding grid of large device and design construction method |
| CN106607648A (en) * | 2015-10-22 | 2017-05-03 | 五冶集团上海有限公司 | Fireclay fusion welding method for equipment shell grounding rods and grounding net |
| CN106607648B (en) * | 2015-10-22 | 2018-12-14 | 五冶集团上海有限公司 | A kind of fireclay welding method of equipment ground stick and grounded screen |
| CN105977661A (en) * | 2016-06-22 | 2016-09-28 | 中国能源建设集团江苏省电力建设第三工程有限公司 | Installation and construction technology of grounding copper cables |
| CN108551003A (en) * | 2018-06-22 | 2018-09-18 | 深圳供电局有限公司 | Pipe grounding net |
| CN111446660A (en) * | 2020-03-27 | 2020-07-24 | 上海宝冶集团有限公司 | Construction method for comprehensive grounding outgoing line of power grid of substation |
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| CN101304148B (en) | 2010-04-21 |
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