1 scope
The technology is applicable to 10kV and below the general industrial and civil electrical installation power cable laying.
2 construction preparation
2.1 devices and materials requirements:
2.1.1 all material specifications and voltage should comply with the design requirements and product certification.
2.1.2 each coaxial cable should be marked on the cable specification, model, voltage, length, date. Cable axis should be undamaged.
2.1.3 cables look intact, sheathed no corrosion, mechanical damage, obviously ruffled and distorted. Seal oil-filled cables should be fine, no oil leakage and oil leakage. Rubber and plastic cable jacketing and insulating show no aging and cracking.
Corrosion of metallic steel 2.1.4 there should be clear, no burrs inside. All fixing bolts are galvanized parts should be used.
2.1.5 other accessories: cable cover and cables labeled piles, cable signs, paint, gasoline, seal, stearic acid, a white cloth belt, rubber cloth, black cloth and should meet the requirements.
2.2 the main tools:
2.2.1 brackets and shafts for electric equipment, laying of cables, cables, rollers, transfer guide pulley, chain hoist, pulley, rope, hemp rope, Jack.
2.2.2 insulating shake table, measuring tape, hacksaw, hammer, wrench tools, electrical tools, electrical welding.
2.2.3 radio (or a simple phone), hand-held megaphones (conditional use of multifunction amplifier for communications).
2.3 operating conditions:
2.3.1 civil engineering shall satisfy the following conditions:
2.3.1.1 reserve holes, embedded design, embedded part installation firm, qualified strength.
2.3.1.2 in trenches, tunnels, shafts and flooring such as manholes and plastering over, trench drainage flow, no water.
2.3.1.3 templates such as demolition is completed along the cable. Site cleared, roads, trench cover in place.
2.3.1.4 cables with scaffolding is completed, and meet the safety requirements, lighting illumination along the cable meets the construction requirements.
2.3.1.5 direct-buried in trenches dug, cable shaft brick plastering is complete, sand finish paving, and clear the ditch the junk. Cover and sand transport to the ditch.
2.3.2 installation should have the following conditions
2.3.2.1 distribution fee for all electrical equipment and electrical equipment distribution Cabinet is installed.
2.3.2.2 cable trays, cable tray, cable and wire tube, protection tube is installed, and inspected.
3 operational processes
3.1 process:
→ Direct-buried cable buried sand backfill in brick → → → →
Preparations →
Horizontal installation
→ → → Laying cable along the frame, tray hanging sign
→ Vertical installation
Buried pile → → tube waterproof flax brush oil and hanging signs
3.2 preparing for work:
3.2.1 construction wiring should be carried out before detailed inspection specifications, models, cross-section, voltage levels are in line with the design requirements, the appearance of distortion, damage and oil leakage, oil leakage, and so on.
3.2.2 shake test insulation resistance or pressure the cable before laying trials.
3.2.2.1 below 1kV cable with 1kV shake shake test line and the insulation resistance to ground should not be less than 10M.
3.2.2.2 3~10kV cable should be in advance for pressure and leakage test, test standards should comply with national and local power supply Department. Necessary before laying still need 2.5kV shaking table when measuring insulation resistance is qualified.
3.2.2.3 paper insulated cable test failed, you should check that the wire is protected from moisture, damp, saw off a test, until qualified so far. Methods are: insulation paper peeling off a small piece of wire with fire lit, such as beep beep sound, namely, cable has been exposed to moisture.
3.2.2.4 cable test is completed, oil-impregnated paper insulated cables immediately with solder (Pb-SN alloy) seal the cable head. Other fabric using rubber sealing of the cable and then wrapped with a black cloth.
3.2.3 installation of cable equipment: mechanical cable, machinery should be selected the appropriate location, and wire rope and pulley installed. Human drop cable to the wheel installed in advance.
3.2.4 temporary liaison command set:
3.2.4.1 lines shorter or outdoor cable, available radio liaison, carrying loudspeakers directed.
3.2.4.2 high-rise building cabling, radios that are available as a directional contact, simple phone as a full contact, carrying loudspeakers directed (or multi-purpose amplifier, it is the direction cable special equipment).
3.2.5 when multiple cables on a bridge or shield, under field conditions, the cables arranged in advance, in tables or figure a way out. In case the cable crossover and chaos.
3.2.6 cable laying in the winter, when the temperature is not up to specifications, cable should be heated in advance.
3.2.7 cable handling and support to set up:
3.2.7.1 cable short-distance transport, generally use the scroll method of cable shaft. Scroll scroll should be based on the direction of the arrow on the cable axis. If there is no arrow, cable-wound direction can not reverse-wound direction and rolled to avoid cable slack.
3.2.7.2 cable bracket mounting location should be selected, subject to the laying, usually near the start and end points of the cable should be as straight. When erecting, should pay attention to the cable axis of rotation direction, leads to end of the cable in the cable above the shaft (Figure 2-1).
3.3 direct buried cabling:
3.3.1 clear channel debris, spread bottom sediment or soil.
3.3.2 cabling
3.3.2.1 available manpower for cable pull or mechanical traction. Mechanical traction electric cutter grinding or pick up available (given method) (see Figure 2-2) and (2-3). Cable laying, cable bend radius should be noticed, the specification requirements.
3.3.2.2 cable laying in the trench shall have the right amount of snake-bending, both ends of the cable, connector, cables, and pipes, vertical Parallax should be more than adequate.
3.3.3 sand brick:
3.3.3.1 cable laying is complete, should be invited to the project owner, the engineer and construction quality inspection departments of acceptance of concealed work.
3.3.3.2 hidden project acceptance, cable bedding 10cm fine sand or soil, respectively, and made of brick or the cable cover cable cover, cover should be wider than the cable on both sides of 5cm. When you use a cable cover plate and cover plate should point to the current direction.
3.3.4 the backfill. Prior to backfill, conduct a covert project, after passing the backfill and tamp in a timely manner.
3.3.5 buried posts: turning on the cable, connectors, crossover, and out of the building lots should be obvious, such as azimuth bar. Line should be appropriate to add posts. Stake out of the ground to 15cm is appropriate.
3.3.6 in ground wire in and out of buildings, Interior pipe under ground outdoor person, on the tube, according to design or standard Atlas of waterproofing (Figure 2-4).
3.3.7 pockmarks cover cable into the indoor section, you should Peel the bark off, and painted anti-corrosion paint.
3.4 laying cable along the frame, tray:
3.4.1 level laying
3.4.1.1 laying method can be human or mechanical traction.
3.4.1.2 when laying cable along the tray or tray, single layer should be laid neatly. There shall be no cross, turning on the maximum section of cable bending radius shall prevail.
3.4.1.3 laying graded voltage cables should be layered, high voltage cables should be laid on top.
3.4.1.4 the voltage cable laying along the stent, horizontal spacing must be at least 35. mm
3.4.2 Vertical installation.
3.4.2.1 vertical laying, laying the best from top to bottom. Prior to the demolition crane construction, hanging to the floor at the top of the cable. Under installation, cable with cross section should be laying low, after laying the top, paying special attention to, and part of the floor around the cable axis slide-proof measures should be taken.
3.4.2.2 laying from the bottom up, lower traction laying of small cross section cable pulley line available manpower. Tall, large section cables should be laid with mechanical traction.
3.4.2.3 bracket installation, bracket distance not greater than 1.5 metres, along the bridge or tray installation, installing at least two cards on each floor fixing brackets. Installation should be immediately put a solid one.
3.4.2.4 when cables across the floor, shall be packed casing, after laying out the casing with fire-resistant materials should be sealed tightly.
3.5 hangs a sign:
3.5.1 specifications of the sign should be consistent, and corrosion resistance, mounting should be solid.
3.5.2 signs should indicate the cable number, size, type and the voltage level.
3.5.3 buried cable in and out of buildings, wells and hang signs at both ends of the cable.
3.5.4 bridge cables along the stent at either end, corner, intersection should hang signs, line should give due additional signs.
4 quality criteria
4.1 project:
4.1.1 cable pressure resistance test results, the leakage current and insulation resistance code requirements must be met.
Inspection methods: inspection and test records.
4.1.2 cable must comply with the following requirements: cable prohibited strand twist, armoured compressed, nursing breaks and severe scratches and other defects on the surface, when buried, is strictly prohibited in the parallel laying of pipeline above or below.
Inspection method: observation on concealed works of checking and inspection records.
4.2 Basic project:
4.2.1 coordinates and elevations are correct, neat, flag poles and signs set accurate; fire, full insulation and anti-corrosion cable protection measures.
4.2.2 in bracket Shang laying Shi, fixed reliable, with side bracket Shang of cable arranged order right, control cable in power cable following, 1kV and following power cable should put in 1kV above power cable following; straight buried cable laid depth, and backfill soil requirements, and protection measures and cable between and cable and underground tube network between parallel or cross of minimum distance are should meet construction specification provides.
4.2.3 turning cable and branch office are not disordered, into neat, complete cable signs, clear signs, buried cables concealed work records and charts are complete and accurate.
Inspection method: observation on concealed works of checking and inspection records and charts.
4.3 minimum bending radius of the cable and test methods shall conform to the requirements of table 2-l.
Minimum bending radius of the cable and test method of table 2-1
Project testing methods for bending radius
Cables single core
Core 20D
15D check
The smallest rubber or PVC sheath 10d
1 allow bare lead-sheathed rubber insulated power cable 15D
Curved lead-sheathed, steel tape armoured 20D check
RADIUS power cable with plastic insulation 10d
Control cable 10d
Note: d for the cable diameter.
5 finished product protection
5.1 direct-buried cable construction it is premature, generally in other outdoor projects after completion of the Basic, preventing other underground construction damage cable. As cable laying out prematurely, while other underground construction, inspections should be strengthened.
5.2 direct-buried cable after the sand immediately, cover plates or bricks and backfill tamping, preventing other heavy damage cable. And promptly set aside as-built drawings, indicating the actual to the position coordinates and depth of laying of the cable.
5.3 room along the cables through the cable channel after the construction trench cover shall immediately be covered.
5.4 indoor in a tray or trays for laying cables, suitable pipes and air conditioning engineering on completion of the basic construction, preventing other specialized construction damage cable.
5.5 cable ends at the head of the doors and Windows installed and locked, preventing cable is missing or damaged.
6 quality problems to be noticed
6.1 direct-buried cable sand cover or brick should be to prevent the trench is not cleared debris, no sand or fine soils, cover plates or bricks is not strict, there are missing parts. Operators should step up its inspection of construction.
6.2 cables into the room when the cable channel to prevent bad waterproof casing, ditch the water. Construction should be strictly according to norms and technical requirements.
6.3 oil dip both ends of the cable to prevent seal not tight, oil leakage phenomenon. Construction technical training of personnel, and improve the level of operation.
6.4 in a bracket or bridge laying cables, should prevent the cables neatly aligned, cross is serious. Prior to construction of the cable the cable arranged well in advance, draw the Pareto chart, charts for construction. Cable laying, laying a finishing one, solid one.
6.5 pockmarks cover cable into the Interior to prevent peeling brushing oil preservative treatment.
6.6 in a tray or trays for laying the cable bend radius should be prevented is not enough. In the tray or tray construction, builders should be taken into account to meet the bridge or a tray laid the biggest section of the bending radius of the cable required.
6.7 prevention of wire and signs mounted irregular or missing. Review shall be delivered by hand.
7 quality records
7.1 quality assurance data;
7.1.1 cable product certification.
Shake test record, or 7.1.2 cable insulation resistance test record.
7.1.3 cover engineering acceptance record.
7.1.4 metal steel material certificate, certificate.
7.2 the construction records:
7.2.1 mutual inspection records
7.2.2 cable engineering quality inspection and assessment of records.
7.2.3 project acceptance record.
The technology is applicable to 10kV and below the general industrial and civil electrical installation power cable laying.
2 construction preparation
2.1 devices and materials requirements:
2.1.1 all material specifications and voltage should comply with the design requirements and product certification.
2.1.2 each coaxial cable should be marked on the cable specification, model, voltage, length, date. Cable axis should be undamaged.
2.1.3 cables look intact, sheathed no corrosion, mechanical damage, obviously ruffled and distorted. Seal oil-filled cables should be fine, no oil leakage and oil leakage. Rubber and plastic cable jacketing and insulating show no aging and cracking.
Corrosion of metallic steel 2.1.4 there should be clear, no burrs inside. All fixing bolts are galvanized parts should be used.
2.1.5 other accessories: cable cover and cables labeled piles, cable signs, paint, gasoline, seal, stearic acid, a white cloth belt, rubber cloth, black cloth and should meet the requirements.
2.2 the main tools:
2.2.1 brackets and shafts for electric equipment, laying of cables, cables, rollers, transfer guide pulley, chain hoist, pulley, rope, hemp rope, Jack.
2.2.2 insulating shake table, measuring tape, hacksaw, hammer, wrench tools, electrical tools, electrical welding.
2.2.3 radio (or a simple phone), hand-held megaphones (conditional use of multifunction amplifier for communications).
2.3 operating conditions:
2.3.1 civil engineering shall satisfy the following conditions:
2.3.1.1 reserve holes, embedded design, embedded part installation firm, qualified strength.
2.3.1.2 in trenches, tunnels, shafts and flooring such as manholes and plastering over, trench drainage flow, no water.
2.3.1.3 templates such as demolition is completed along the cable. Site cleared, roads, trench cover in place.
2.3.1.4 cables with scaffolding is completed, and meet the safety requirements, lighting illumination along the cable meets the construction requirements.
2.3.1.5 direct-buried in trenches dug, cable shaft brick plastering is complete, sand finish paving, and clear the ditch the junk. Cover and sand transport to the ditch.
2.3.2 installation should have the following conditions
2.3.2.1 distribution fee for all electrical equipment and electrical equipment distribution Cabinet is installed.
2.3.2.2 cable trays, cable tray, cable and wire tube, protection tube is installed, and inspected.
3 operational processes
3.1 process:
→ Direct-buried cable buried sand backfill in brick → → → →
Preparations →
Horizontal installation
→ → → Laying cable along the frame, tray hanging sign
→ Vertical installation
Buried pile → → tube waterproof flax brush oil and hanging signs
3.2 preparing for work:
3.2.1 construction wiring should be carried out before detailed inspection specifications, models, cross-section, voltage levels are in line with the design requirements, the appearance of distortion, damage and oil leakage, oil leakage, and so on.
3.2.2 shake test insulation resistance or pressure the cable before laying trials.
3.2.2.1 below 1kV cable with 1kV shake shake test line and the insulation resistance to ground should not be less than 10M.
3.2.2.2 3~10kV cable should be in advance for pressure and leakage test, test standards should comply with national and local power supply Department. Necessary before laying still need 2.5kV shaking table when measuring insulation resistance is qualified.
3.2.2.3 paper insulated cable test failed, you should check that the wire is protected from moisture, damp, saw off a test, until qualified so far. Methods are: insulation paper peeling off a small piece of wire with fire lit, such as beep beep sound, namely, cable has been exposed to moisture.
3.2.2.4 cable test is completed, oil-impregnated paper insulated cables immediately with solder (Pb-SN alloy) seal the cable head. Other fabric using rubber sealing of the cable and then wrapped with a black cloth.
3.2.3 installation of cable equipment: mechanical cable, machinery should be selected the appropriate location, and wire rope and pulley installed. Human drop cable to the wheel installed in advance.
3.2.4 temporary liaison command set:
3.2.4.1 lines shorter or outdoor cable, available radio liaison, carrying loudspeakers directed.
3.2.4.2 high-rise building cabling, radios that are available as a directional contact, simple phone as a full contact, carrying loudspeakers directed (or multi-purpose amplifier, it is the direction cable special equipment).
3.2.5 when multiple cables on a bridge or shield, under field conditions, the cables arranged in advance, in tables or figure a way out. In case the cable crossover and chaos.
3.2.6 cable laying in the winter, when the temperature is not up to specifications, cable should be heated in advance.
3.2.7 cable handling and support to set up:
3.2.7.1 cable short-distance transport, generally use the scroll method of cable shaft. Scroll scroll should be based on the direction of the arrow on the cable axis. If there is no arrow, cable-wound direction can not reverse-wound direction and rolled to avoid cable slack.
3.2.7.2 cable bracket mounting location should be selected, subject to the laying, usually near the start and end points of the cable should be as straight. When erecting, should pay attention to the cable axis of rotation direction, leads to end of the cable in the cable above the shaft (Figure 2-1).
3.3 direct buried cabling:
3.3.1 clear channel debris, spread bottom sediment or soil.
3.3.2 cabling
3.3.2.1 available manpower for cable pull or mechanical traction. Mechanical traction electric cutter grinding or pick up available (given method) (see Figure 2-2) and (2-3). Cable laying, cable bend radius should be noticed, the specification requirements.
3.3.2.2 cable laying in the trench shall have the right amount of snake-bending, both ends of the cable, connector, cables, and pipes, vertical Parallax should be more than adequate.
3.3.3 sand brick:
3.3.3.1 cable laying is complete, should be invited to the project owner, the engineer and construction quality inspection departments of acceptance of concealed work.
3.3.3.2 hidden project acceptance, cable bedding 10cm fine sand or soil, respectively, and made of brick or the cable cover cable cover, cover should be wider than the cable on both sides of 5cm. When you use a cable cover plate and cover plate should point to the current direction.
3.3.4 the backfill. Prior to backfill, conduct a covert project, after passing the backfill and tamp in a timely manner.
3.3.5 buried posts: turning on the cable, connectors, crossover, and out of the building lots should be obvious, such as azimuth bar. Line should be appropriate to add posts. Stake out of the ground to 15cm is appropriate.
3.3.6 in ground wire in and out of buildings, Interior pipe under ground outdoor person, on the tube, according to design or standard Atlas of waterproofing (Figure 2-4).
3.3.7 pockmarks cover cable into the indoor section, you should Peel the bark off, and painted anti-corrosion paint.
3.4 laying cable along the frame, tray:
3.4.1 level laying
3.4.1.1 laying method can be human or mechanical traction.
3.4.1.2 when laying cable along the tray or tray, single layer should be laid neatly. There shall be no cross, turning on the maximum section of cable bending radius shall prevail.
3.4.1.3 laying graded voltage cables should be layered, high voltage cables should be laid on top.
3.4.1.4 the voltage cable laying along the stent, horizontal spacing must be at least 35. mm
3.4.2 Vertical installation.
3.4.2.1 vertical laying, laying the best from top to bottom. Prior to the demolition crane construction, hanging to the floor at the top of the cable. Under installation, cable with cross section should be laying low, after laying the top, paying special attention to, and part of the floor around the cable axis slide-proof measures should be taken.
3.4.2.2 laying from the bottom up, lower traction laying of small cross section cable pulley line available manpower. Tall, large section cables should be laid with mechanical traction.
3.4.2.3 bracket installation, bracket distance not greater than 1.5 metres, along the bridge or tray installation, installing at least two cards on each floor fixing brackets. Installation should be immediately put a solid one.
3.4.2.4 when cables across the floor, shall be packed casing, after laying out the casing with fire-resistant materials should be sealed tightly.
3.5 hangs a sign:
3.5.1 specifications of the sign should be consistent, and corrosion resistance, mounting should be solid.
3.5.2 signs should indicate the cable number, size, type and the voltage level.
3.5.3 buried cable in and out of buildings, wells and hang signs at both ends of the cable.
3.5.4 bridge cables along the stent at either end, corner, intersection should hang signs, line should give due additional signs.
4 quality criteria
4.1 project:
4.1.1 cable pressure resistance test results, the leakage current and insulation resistance code requirements must be met.
Inspection methods: inspection and test records.
4.1.2 cable must comply with the following requirements: cable prohibited strand twist, armoured compressed, nursing breaks and severe scratches and other defects on the surface, when buried, is strictly prohibited in the parallel laying of pipeline above or below.
Inspection method: observation on concealed works of checking and inspection records.
4.2 Basic project:
4.2.1 coordinates and elevations are correct, neat, flag poles and signs set accurate; fire, full insulation and anti-corrosion cable protection measures.
4.2.2 in bracket Shang laying Shi, fixed reliable, with side bracket Shang of cable arranged order right, control cable in power cable following, 1kV and following power cable should put in 1kV above power cable following; straight buried cable laid depth, and backfill soil requirements, and protection measures and cable between and cable and underground tube network between parallel or cross of minimum distance are should meet construction specification provides.
4.2.3 turning cable and branch office are not disordered, into neat, complete cable signs, clear signs, buried cables concealed work records and charts are complete and accurate.
Inspection method: observation on concealed works of checking and inspection records and charts.
4.3 minimum bending radius of the cable and test methods shall conform to the requirements of table 2-l.
Minimum bending radius of the cable and test method of table 2-1
Project testing methods for bending radius
Cables single core
Core 20D
15D check
The smallest rubber or PVC sheath 10d
1 allow bare lead-sheathed rubber insulated power cable 15D
Curved lead-sheathed, steel tape armoured 20D check
RADIUS power cable with plastic insulation 10d
Control cable 10d
Note: d for the cable diameter.
5 finished product protection
5.1 direct-buried cable construction it is premature, generally in other outdoor projects after completion of the Basic, preventing other underground construction damage cable. As cable laying out prematurely, while other underground construction, inspections should be strengthened.
5.2 direct-buried cable after the sand immediately, cover plates or bricks and backfill tamping, preventing other heavy damage cable. And promptly set aside as-built drawings, indicating the actual to the position coordinates and depth of laying of the cable.
5.3 room along the cables through the cable channel after the construction trench cover shall immediately be covered.
5.4 indoor in a tray or trays for laying cables, suitable pipes and air conditioning engineering on completion of the basic construction, preventing other specialized construction damage cable.
5.5 cable ends at the head of the doors and Windows installed and locked, preventing cable is missing or damaged.
6 quality problems to be noticed
6.1 direct-buried cable sand cover or brick should be to prevent the trench is not cleared debris, no sand or fine soils, cover plates or bricks is not strict, there are missing parts. Operators should step up its inspection of construction.
6.2 cables into the room when the cable channel to prevent bad waterproof casing, ditch the water. Construction should be strictly according to norms and technical requirements.
6.3 oil dip both ends of the cable to prevent seal not tight, oil leakage phenomenon. Construction technical training of personnel, and improve the level of operation.
6.4 in a bracket or bridge laying cables, should prevent the cables neatly aligned, cross is serious. Prior to construction of the cable the cable arranged well in advance, draw the Pareto chart, charts for construction. Cable laying, laying a finishing one, solid one.
6.5 pockmarks cover cable into the Interior to prevent peeling brushing oil preservative treatment.
6.6 in a tray or trays for laying the cable bend radius should be prevented is not enough. In the tray or tray construction, builders should be taken into account to meet the bridge or a tray laid the biggest section of the bending radius of the cable required.
6.7 prevention of wire and signs mounted irregular or missing. Review shall be delivered by hand.
7 quality records
7.1 quality assurance data;
7.1.1 cable product certification.
Shake test record, or 7.1.2 cable insulation resistance test record.
7.1.3 cover engineering acceptance record.
7.1.4 metal steel material certificate, certificate.
7.2 the construction records:
7.2.1 mutual inspection records
7.2.2 cable engineering quality inspection and assessment of records.
7.2.3 project acceptance record.
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