Installation of lightning protection and grounding technology standards
Release Date:2014-07-07 15:05:44 Click rate:1, range
This process standards applicable to lightning and lightning protection and grounding power system construction of buildings and structures, protective grounding, grounding, grounding and shielding grounding repeat.
2, construction preparation
2.1 Material Requirements
2.1.1 There galvanized steel flat steel, angle iron, bar, pipe, etc., should pay attention to the use of cold galvanized or hot dip galvanized material shall meet the design requirements. Products should be material inspection certificate and factory certification.
2.1.2 galvanized materials have lead wire (ie, galvanized wire), bolts, washers, spring washers, U-bolts, gold bolts, brackets, etc.
2.1.3 welding, oxygen, acetylene, asphalt paint, concrete frame, embedded iron, a small wire, cement, sand, plastic tube, red paint, white paint, anti-corrosion paint, silver, black paint.
2.2 The main equipment
2.2.1 common electrical tools, hand hammer, hacksaw, saw blades, pressure case, shovel, hammer, impact drill, welding machine, welding tools.
2.3 Operating conditions
2.3.1 grounding operating conditions:
(1) according to design a good position to clean up the site.
(2) floor muscle tendon junction with the column has been lashing finished.
(3) the pile and column reinforcement steel connections have been lashing finished.
2.3.2 grounding lines operating conditions:
(1) bracket installed.
(2) protection tube is embedded.
(3) civil plaster finish.
2.3.3 bracket installation conditions:
(1) a variety of stent has been transported to the site.
(2) Structural engineering has been completed.
(3) Outside ladder or scaffold must have.
2.3.4 mine laying operations deflectors dark conditions:
(1) Buildings (or structures) have scaffolding or ladders, Master operation conditions can be achieved.
(2) the use of reinforcement as deflectors, steel banding is completed.
2.3.5 Operating conditions laid out lightning deflectors:
(1) bracket installed.
(2) building (or structure) has a scaffolding or ladders to reach the condition can Exalted operation.
Completed (3) civil decoration.
2.3.6 equalizing ring with lightning and installation conditions:
Civil engineering steel ring beam is banding, the cooperation with this work.
2.3.7 lightning network installation conditions:
(1) grounding must be done with deflectors.
(2) bracket installed.
2.3.8 lightning rod installation conditions:
(1) grounding and deflectors must be done.
(2) require scaffolding Department, scaffolding erection completed.
(3) civil construction works have been completed, and construction done with the structure embedded parts.
3, the operation process
Route grounding grounding → → deflectors Concealed (bracket, deflectors for surface) → with lightning or equalizing ring → lightning (lightning network).
3.2 grounding installation process
Artificial grounding (pole) installation shall comply with the following requirements:
3.2.1 artificial grounding (very) minimum size shown in Table 3-48.
Minimum specifications steel grounding and grounding wire
Type, size, and above and below ground units
Indoor and outdoor alternating current circuit DC current loop
Round Diameter (mm) 6 8 10 12
Flat cross section (mm2) 60 100 100 100
Thickness (mm2) 3 4 4 6
Angle Thickness (mm) 2 2.5 4 6
Pipe wall thickness (mm) 2.5 2.5 3.5 4.5
3.2.2 burial depth of the grounding of its top not less than 0.6m, angle iron and steel grounding should be vertical configuration.
3.2.3 Rods length of not less than 2.5m, generally not less than 5m spacing between their mutual.
3.2.4 The grounding location away from buildings buried not less than 1.5m; case when ash and other trash buried grounding, should be replaced by soil compaction and layering.
3.2.5 When the device must be buried in the ground away from buildings or sidewalks of the population is less than 3m, should be used in grading practices or grounding device with the laying of 50 ~ 90mm above the bitumen layer thickness additions. Its width should exceed grounding 2m.
3.2.6 grounding connection (line) should be used for welding, weld seam should be plump and have sufficient mechanical strength, not a slag, bite the meat, crack, Weld, porosity and other defects, coating welding knock after the net, brush asphalt do embalmed.
3.2.7 When using lap welding, the welding length as follows:
(1) galvanized flat steel not less than 2 times its width, three welding. (Not the same as the width of flat steel, lap length to width, whichever) before laying flat need straightening, bending shall simmer over death, there should be no significant bending a straight line segment, and should stand up.
(2) the length of galvanized welded round six times its diameter and should be double-sided welding (not the same as the diameter of the lap length to diameter, whichever is larger).
(3) galvanized and galvanized flat steel bar connected to a length of 6 times the diameter of the round.
(4) galvanized flat steel and galvanized steel (or angle) welding, in order to connect reliably, in addition to welding parts in contact with both sides, but also directly to the flat itself bent arc (or rectangular-shaped) and steel (or angle) welding.
3.2.8 When the ground wire in case of lime cinder layer can not be avoided, the application of cement mortar round protection.
3.2.9 When using chemical methods to reduce soil resistivity, the materials used shall meet the following requirements:
(1) less corrosive to metal;
(2) water-soluble component content is low.
3.2.10 All metal parts should be galvanized. Operation, to protect the zinc coating.
3.3 artificial grounding (pole) Installation
3.3.1 grounding processing:
According to the number of design requirements, material specifications and processing, materials are generally used in the steel and angle cutting length should not be less than 2.5m. Such as steel pipe into the ground should be based on soil processed into a certain shape, the case of soft soil, can be cut into the slope shape.
In order to avoid uneven force into the tube skew, also processed into flat tip; case when the soil is very hard, can be processed into a tapered tip, such as when the choice angle, should not be less than 40 × 40 × 4mm of angle, cutting length of not less than 2.5m, to be processed into end angle tip shape.
According to the design requirements for grounding (network) of lines for measuring elastic line, digging deep on this line is 0.8 ~ 1m, 0.5m wide ditch, ditch the upper slightly wider at the bottom, if any, should be cleared of stones.
3.3.3 install grounding (pole):
After the ditch dug, you should immediately install grounding and laying flat ground, to prevent the collapse of earth. First grounding on the center line of the ditch, into the ground, the general use of hand-hammer into a body of people leaning on the ground, one with a sledgehammer beat top grounding. In order to prevent the welded steel pipe or angle iron play hack, you can add a protective tube pipe end caps into the ground, the angle can be ground lug (about l0cm) welded to an angle to the ground. When using a hammer hand to steady grounding, grounding the middle of hammering not missed, should be perpendicular to the ground, when the body of the top 600mm from the ground when stopped into.
3.3.4 grounding between flat laying:
Should straighten before laying flat and then placed in the trench flat, flat sequentially and grounding welding welding (welding). Flat and can not be laid flat on its side, while its side diffuser resistance is smaller. Location flat steel and steel connections
From the highest point of the grounding of about 100mm. Welding should be flat straightening, welding after a good clear coating, brush asphalt do embalmed, and leads to the ground wire to the desired position, with sufficient length of the connection to be used.
3.3.5 verification grounding (line):
After connecting the grounding should be hidden in a timely manner, please check the quality inspection departments, grounding materials, location, quality of welding, grounding (wire) cross-section shall comply with the design specifications and construction inspection specifications, can be carried out after passing inspection backfilling, compaction in layers. Finally, the shaking earth resistance value measured fill in the hidden inspection records.
3.4 Nature foundation grounding installation
3.4.1 The use of non-waterproof floor made of reinforced or deep foundation grounding.
No use of reinforced waterproof bottom or deep foundations do grounding: position size by design requirements, marking a good location, good lap welding steel base plate. Then the column reinforcement (less than 2) at the bottom of the base plate lap weld reinforcement and below ground in the outdoor weld reinforcement plate will eliminate drug skin, and the two reinforcement and marked with paint in order to elicit and inspection. Please quality inspection departments should promptly seized hidden, while doing hidden seized records.
3.4.2 The use of cylindrical steel pile foundation and platform to do the grounding, according to the design size position to find a good set of numbers pile position, the lap steel in each pile seal welded corners, and then with the column reinforcement (less than 2) weld and below ground outdoors, the reinforcement embedded good grounding plate, clear coating, and the two reinforcement and marked with paint in order to elicit and inspection. Please quality inspection departments should promptly seized hidden, while doing hidden seized records.
3.5 grounding line installation shall comply with the following requirements
3.5.1 ground lines through walls, should be added to protect the casing when crossing expansion joints should be done simmer bend compensation.
3.5.2 There should be a grounding line to measure ground resistance clamp disconnected and prepared for the general use of the cartridge is loaded, and the installation of ground cover and cook mark.
3.5.3 dark doorway across the grounding line should be laid in the ground (do before burying ground).
3.5.4 Ground trunk from the ground should not be less than 200mm, from the wall should not be less than l0mm, should be used to support 40 × 4mm piece of flat steel, dovetail-shaped tail should be made, into the depth and width of each hole is 50mm, overall length to 70mm. Straight-line distance between the horizontal support member is generally lm, the vertical part of 1.5m, the turn portions of 0.5m.
3.5.5 Route laying the ground should be flat, level and verticality tolerance 2/1000, but the total length does not exceed l0mm.
3.5.6 Grounding the corner of Route bend radius shall not be less than two times the thickness of the flat.
3.5.7 grounding line should be brushed black paint, the paint should be uniform exhaustive, but disconnect clamps and ground terminals, etc. may not paint.
3.6 grounding line installation
Flat ground lines should be connected with the grounding is connected, it is divided into indoor and outdoor connecting two outdoor ground trunk and branch generally laid in the trench. Ground lines for surface indoors mostly, but some of the equipment connected to the branch subject to the ground, you can also buried in the concrete. Specific installation method is as follows:
3.6.1 Outdoor trunk laying the ground:
(1) First, grounding Route straightening, positioning, drilling, bending simmer and disconnect clamps and ground terminals installed.
(2) prior to the laying of the design requirements according to the size of the position of the first trench. Trenching asked to see 3.3, then flat flat buried. Backfill should be compacted but without ramming, grounding line ends above the ground should not exceed 0.5m, so escorts ground.
3.6.2 Indoor ground lines laid out:
(1) set aside to support hole and buried parts:
Position size according to design requirements, set aside ground wire hole, the size of the hole should be reserved for laying the ground than dry thickness, width of 6mm or more major. The methods are the following:
A, according to the above requirements during the construction period saw the size of flat steel embedded in the walls, when the concrete has not yet solidified solidified tic flat so easy to be drawn.
B, will be buried in a layer of oil within the walls of the bag or several layers of kraft paper on a flat blankets, wall surfaces should be reserved for pitch 15 ~ 20mm.
C, a thickness of 1mm or more protective metal sleeve used to make a square or round, should be sized so that the grounding wire through each side of a gap of more than 6mm.
(2) support for fixing:
First determine the coordinates of the position of the axis in accordance with the design requirements of a brick wall (or aerated concrete wall, hollow bricks), and then with prefabricated walls into 50 × 50mm square wooden model of the wall to be placed upon the wall Qi Hao square wooden model excised, and then the support piece into the hole, while wet watering holes, and then buried in cement mortar will support member in prison, to be solidified after use. Cast concrete wall mounting bracket, according to the design requirements of the first bullet line positioning, drilling, do dovetail bracket buried hole, leveling positive, fixed with cement mortar.
(3) Installation requirements for surface ground wire
A, laying position should not hinder disassembly and repair of equipment, and to facilitate inspection.
B, ground wire should be laid horizontally or vertically, can be tilted parallel structures on buildings along the line segment, there are ups and downs and not bending situation.
C, while laying along the ground level of the building wall, the ground should be kept a distance of 250 ~ 300mm, ground clearance with the wall of a building shall be not less than l0mm.
D, for surface ground wire surface should be painted in green paint and yellow paint and white stripes of equal width 15 ~ l00mm, marked clearly.
E, the grounding line towards the entrance of the building at the ground with a temporary repair shall be marked with the white primer brush black; symbol, the sign of the "main" signs apparent.
(4) for surface ground wire installation:
When the support member buried completed, cement mortar solidified, ground wire can be laid on the wall. The flat ground along the wall lifted, with the support of the flat with the clamp one end fixed, passes through holes for wall wearing a cross, grounding line connections shall be welded securely. The end of the reservation or connection should meet the design requirements.
3.7 lightning rod production and installation
3.7.1 Ray needle wall fabrication and installation shall comply with the following requirements
(1) All metal parts must be galvanized zinc coating to protect the operation.
(2) the production of galvanized steel tip, the wall thickness of not less than 3mm, nail brush tip tin length must not be less than 70mm.
(3) multi-section dimensions are shown in Table 3-49 lightning rod sections.
Nail body size sections
Items needle full height (mm)
1.0 2.0 3.0 4.0 5.0
The 1000 section 2,000,150,010,001,500
The festival - 1500 1500 1500
Under section --- 1500 2000
(4) lightning rod should be installed vertically firmly verticality tolerance of 3/1000.
(5) welding requirements are detailed in Section 4.2.2 (2) of the coating after clearing brush rust.
(6) made of lightning generally use round or pipe, with a diameter not less than the following values:
A, independent lightning rod with a diameter of 19mm galvanized generally round.
B, lightning generally should adopt 25mm diameter galvanized steel on the roof.
C, the top of the tower lightning rod with a diameter of 25mm or 40mm galvanized pipe.
D, a lightning rod on top of the chimney with a diameter of 25mm to 40mm diameter galvanized steel bar or galvanized steel.
E, lightning ring diameter 12mm galvanized steel bar or section is l00mm2 galvanized flat steel, having a thickness of 4mm.
3.7.2 lightning rod production:
By material design requirements on the desired length, middle and lower sections for the next three materials. If the needle used in the steel making, steel sections can be first on the jagged end of sawn by hand after closing hammer tip, carried weld sharpened, rinse the tin, and then the other end, the next section to find the second straight pipe, weld .
3.7.3 lightning rod installation:
First floor bearing plate fixed on the anchor bolts embedded on welding a piece of rib, then the lightning rod erect, looking straight alignment after spot welding, and then corrected, the other three welding ribs board. Finally, the deflectors welded to the base plate, clear brush rust coating.
3.8.1 bracket should meet the following requirements:
(1) angle brackets should dovetail its underground injection depth of not less than l00mm, flat and round bracket depth of not less than 80mm.
(2) All brackets must be strong, mortar plump, smooth vertical and horizontal.
Various top bracket (3) lightning protection devices should generally be from building surfaces l00mm; grounding line should be at the top wall bracket 20mm.
(4) bracket horizontal spacing of not more than 1m (concrete bearing no more than 2m); vertical spacing of not more than 1.5m. Each pitch should be uniform, tolerance 30mm. Corner corner from the center on both sides of the bracket is not greater than 250mm.
(5) the bracket should be straight. Check the levelness of each segment tolerance 2m 3/1000, check the verticality of each segment tolerance 3m 2/1000;, but full-length deviation of not more than l0mm.
(6) stents and other iron should do embalmed.
(1) should be possible with embedded bracket or iron structure construction.
(2) According to the design requirements for playing the lines and sub-file positioning.
(3) hand hammer, chisel be tick-hole, hole size should be consistent inside and outside.
(4) Note first buried in a straight line on both ends of the bracket, and then bury the lead straight strands note other bracket. Note preceded the cave buried wet irrigated.
(5) If a concrete abutment, concrete bearing sub-file gracefully. Pull both ends of a straight line between the first frame, and then the other bracket with mortar looking straight.
(6) If there are embedded iron parapet aside, stand can be soldered directly onto pieces of iron, stand looking straight with the former.
3.9 Laying dark lightning deflectors
3.9.1 dark lightning deflectors laying shall meet the following provisions:
(1) deflectors flat section of not less than 25 × 4mm; bar diameter not less than 12mm.
(2) must be disconnected deflectors clips or test points (except one who deflectors) 1.5 ~ 1.8m from the ground in place. Broken wire clamp bolt diameter used not less than l0mm, and the need to add galvanized washers and galvanized spring washers.
(3) the use of reinforcement for Concealed deflectors, each of not less than two deflectors reinforcement.
Laying deflectors do embalmed within (4) in-situ concrete. Welding requirements, see 3.2.
Metal components (5) buildings (such as fire ladder, iron ladder chimneys, etc.) can be used as deflectors, but among all the metal parts should be connected into the electrical pathway.
(6) deflectors should be laid along the building's exterior walls from air terminals to the grounding, laying the path deflectors should be as short and straight. Depending on the circumstances of the building can not lead the straight line, can be bent, it should be noted from the opening can not be bent less than or equal to 0.1 times the actual length of the curved portion of the segment. Deflectors can be concealed. However, should increase the level of cross-section, but also pay attention to other metal components from the wall when concealed.
Between fixed pivot (7) deflectors distance should not exceed 2m, laying down conductors should maintain a certain tightness.
(8) deflectors should escape the building entrances and pedestrians easier access to the location, to avoid danger.
(9) In places prone to mechanical damage, on the ground about 1.7m to 0.3m underground section of the ground should be added protective measures to reduce the risk of contact voltage.
(10) When using multi-root name deflectors installed, in order to facilitate the measurement of earth resistance, as well as connections test deflectors and ground lines should be 1.8 ~ 2.2m from the disconnect clamps in place at each lead. When the use of reinforced concrete columns as deflectors, the ground connection must be soldered to the first floor, at the switchboard and connected to the ground terminal, can measure ground resistance in the ground terminal.
3.9.2 dark lightning deflectors laying practices:
(1) First, the required flat (or round) hand hammer (or reinforced wrench) in straightening or straightened.
(2) will be transferred straight deflectors transported to the installation site, according to the design of buildings to be with the lead, hang up.
(3) in a timely manner with the lower end of the welding good grounding deflectors, or disconnect clamps connected. With the gradual increase of the building, the building will be laid deflectors to the roof so far. For joints shall be welded, soldered should knock the rust coating and brushes (except for in-situ concrete), and invited interested persons received implicit test, make a record.
(4) the use of reinforcement (diameter less than φ16mm) for drop, according to design requirements to identify all the reinforcement position, well marked with paint, 1.8m away from the outdoor terrace at the weld test points in series with the drill steel welded to the top, a certain length deflectors welding, lap length shall not be less than l00mm, after finishing please check the relevant personnel implicit, hidden well seized records.
After completion (5) civil decoration, the deflectors on the ground put protective tube section of 2m, and will be fixed with a clamp securely, red and white paint on the brush.
(6) welding requirements, see 3.2.
Laying out lightning deflectors 3.10
3.10.1 lightning deflectors Ming laying shall meet the following provisions:
(1) must be laid down conductors after straightening, bending at not less than 90 °, and shall not be bent into a corner.
(2) In addition to the design deflectors have special requirements, the galvanized flat steel cross-section of not less than 48mm2, small diameter galvanized steel bar was less than 8mm.
(3) Design and specifications shall enforce the disconnect clamp position.
(4) welding and lap length shall enforce the norms.
Laying out lightning deflectors 3.10.2
(A) in the case of flat steel deflectors can be placed almost straighten hammer hand panel; such as round bar can be open, one end fixed firmly anchored on the equipment, and the other end is fixed cutter grinding (straighten up or pour cold chain) fixture.
(2) will be transferred straight deflectors transported to the installation site.
(3) The deflectors with a large Shengti rose to the highest point, and then fixed top-down point by point until the installation disconnect clamp place. For joint or install disconnect clamps should be welded. After soldering, clear coating, partial straightening brush rust.
(4) The above ground ground segment meters, put on protective tube and solid card and red and white paint brush.
(5) with galvanized bolts disconnect clamps and grounding connections are secure.
3.11 lightning network installation
3.11.1 lightning network installation should meet the following requirements:
(1) lightning belt should be straight, firm, should not have ups and downs and bending phenomena, from the building should be consistent spacing and vertical support members should conform to withstand tensile construction quality acceptance requirements.
(2) with a bend of not less than lightning 90 °, bending radius of not less than 10 times the diameter of the bar.
(3) If lightning belt with flat cross-section of not less than 48mm; such as bar diameter not less than 8mm.
(4) welding requirements, see Section 4.2.2 (2).
(5) In case of deformation joints should be simmering tube compensation.
3.11.2 lightning network installation:
(A) in the case of lightning with flat steel plates can be placed almost hand hammer straighten; such as round, round release can be fixed at one end of the fixture firmly anchor the other end is fixed cutter grinding (up or down the chain) fixture, pull cold straightening.
(2) will be transferred straight with lightning transported to the installation site.
(3) The grounding wire with a large Shengti rise to the top, straight, laying a solid card, connected integrally with deflectors welding. Coating welding should knock, partial straightening brush rust and lead oil (or silver).
(4) Building on the roof projections, such as metal flagpole, ventilation pipes, metal gutters, iron railings, ladders, cooling towers, TV antennas, these parts of the metal conductors and lightning network must be welded into one. The top of the chimney should be done with lightning or lightning.
(5) Deformation of the buildings at the mine should be done across the handle.
(6) Two distinct dark mesh network and lightning network, the more dense dark grid, its reliability, the better. Depending on the density of the grid should be level building mine, mine high level buildings can be used l0m × l0m grid, lightning generally low level of the building can be used 20m × 20m grid, if the design implementation of the special requirements of the design requirements.
3.12 equalizing ring (or avoid Xiao band) Installation:
3.12.1 grading ring (or lightning protection zone) shall meet the following requirements:
(1) with lightning (lightning line) is generally used round diameter not less than φ6, flat steel not less than 24 × 4mm.
(2) laid out with lightning height of the stand is 10 ~ 20cm, the distance between the pivot should not exceed 1.5m, the bent portion is 0.3 ~ 0.5m.
(3) buildings higher than 30m above the site, building four weeks every three layers along with the laying of a lightning deflectors and welded with the root.
(4) aluminum doors and windows and lightning protection device is connected. When processing orders for aluminum doors and windows should be required to throw on the ribbon or flat 30cm 2, where a more than 3m, it takes three external connections to be crimped or soldered.
3.12.2 grading ring (or lightning protection zone) installation:
(1) lightning belt can be laid in the dark surface of the plaster layer of the building, or the direct use of structural steel, and should be deposited with the dark floor of lightning network or welded steel, with lightning in fact it is so equalizing ring.
(2) the use of structures inside the ring beam waist reinforcement or tendons connected with the pre-prepared head about 20cm of steel welded into one, and deflectors in the column reinforcement welded into a whole.
(3) leads to various points within the ring beam steel head, after welding, laying surrounded by round (or flat), forming an annular inner ring beam welding good points, and connected with the deflectors around after. Meanwhile metal doors and windows, metal railings thrown 30cm long φ12mm spare galvanized round the outer edge of the building.
Embedded welding points (4) Wai Yan metal doors, windows, railings, handrails and other metal parts shall not be less than 2, and the lightning round with reserved welded into a whole.
(5) the use of roofing metal handrails do with lightning, arc bent corner should live bend, railings should be ground deflectors reliable welding.
When 3.12.3 holiday lights along with lightning laying flat, the height of lightning protection zone should be higher than the top of the lantern, when the lights vertical laying, hanging lanterns wire should be grounded, taking control of the power supply box lantern installed at low voltage lightning arrester or take other measures.
4, Quality Standards
4.1 master project
4.1.1 Quality of materials meet the design requirements; grounding resistance of grounding devices must meet the design requirements.
4.1.2 connected to the electrical equipment, appliances and other non-current-carrying metal parts detachable grounded branch lines must be directly connected to the grounding line, non-connected in series.
Inspection method: Measured earth resistance testing or inspection records. Observe the inspection or check the installation log.
4.2 General Project
4.2.1 lightning rod (mesh) and the support member is installed in the correct position, stable fixation, good corrosion; needle vertical, lightning network specifications correct size and bend radius; produce lightning and support quality parts comply with the design requirements. The lightning lights the lamp has a full, clear display. Lightning network supports spaced evenly; lightning verticality deviation is not greater than the diameter of the top of the needle bar.
Inspection method: observation and measurement or inspection to check the installation log.
4.2.2 ground (zero) cable laying
(1) flat, firm, fixed-point spacing evenly across the building Deformation compensated device, a protective wall pipe, corrosion paint intact.
(2) weld connections smooth, plump, no obvious holes, bite of meat and other defects; bolted tight, solid, anti-rotation.
(3) lightning protection ground deflectors tube fixed firmly; disconnected clamp set to facilitate the detection, galvanized or tin-plated contact surfaces intact, bolts and other fasteners complete. Uniform corrosion, pollution-free building.
Inspection method: observation checks.
4.2.3 grounding installation:
Correct position, securely connected, grounding burial depth from the ground not less than 0.6m. Hidden works records are complete and accurate.
Inspection method: check the hidden project records.
4.2.4 Lap length ≥ 2b; round ≥ 6D; round and flat ≥ 6D;
Note: b is flat width; D to round diameter.
4.2.5 flat edge lap welding 3, round-sided welding.
Inspection method: measuring tape to check and observe the inspection.
5, product protection
5.1.1 Other types of work in the excavation, careful not to damage the grounding.
5.1.2 install grounding shall destroy bulk water and exterior decoration.
5.1.3 are not free to move in structural steel has been tied.
5.2.1 tick hole should not damage the structure of the building
Note 5.2.2 stable after stent will not hit loose.
5.3 out lightning deflectors (dark) laying
5.3.1 When installing protective tube, attention to protecting the civil structures and surface decoration.
Do not bump deflectors 5.3.2 demolition shelf.
5.4 lightning network laying
5.4.1 In case of a hill tile roof, the operation should take measures to avoid bad foot roof tiles.
5.4.2 not damage the external decoration.
5.4.3 After laying lightning network, avoid smashing hit.
Pre thrown flat iron or round must not exceed 30cm.
5.5.1 dismantling scaffolding, be careful not to damage the lightning rod.
5.5.2 protect civil decoration.
5.6 grounding line installation
Construction, shall not bump and dirty walls 5.6.1 Electric.
5.6.2 before spraying, the ground must be pre-tied wrap the trunk.
5.6.3 dismantling scaffolding or carrying not damage the grounding line.
5.6.4 measures to protect the wall welding.
6, should pay attention to quality issues
6.1.1 grounding enough depth or distance intervals, perform according to design requirements.
6.1.2 The welding surface is not enough, torrefied not clean, not embalmed, according to the quality requirements of the welding surface to correct the drug skin knock the net, good corrosion protection.
6.1.3 The use of foundation, steel beams overlap area is not enough, should be done in strict accordance with quality requirements.
6.2.1 bracket loose, unsound concrete abutment, will find out the cause of the bracket loose, then rigid fixation; concrete abutment put stable.
6.2.2 bracket spacing (or embedded iron) spacing is uneven, not straight line segment, exceeding the allowable deviation, revising good pitch correction straight line segment will not exceed the allowable deviation.
6.2.3 There weld slag, bite of meat, cracks, holes and other defects phenomenon, re-welding, allowed the defect.
6.2.4 torrefied welding is not clean, drain brush rust. Torrefied welding should clean up brush rust.
6.3 Anti Xiao deflectors dark (bright) laying
6.3.1 welding surface is not enough, there is weld slag, biting flesh, cracks, pores and skin treatment drug phenomenon is not clean, repair specifications should be changed.
6.3.2 drain brush rust, you should catch up on the brush.
6.3.3 reinforcement dislocation, should be promptly corrected.
6.3.4 deflectors are not vertical, beyond tolerance, deflectors should be smooth vertical and horizontal, tolerance should be promptly corrected.
6.4 avoid laying Xiao Network
6.4.1 welding surface is not enough, there is weld slag, biting flesh, cracks, pores and skin treatment drug is not clean and so on. Repair specifications should change.
6.4.2 rust uneven or tainted brush Department should brush evenly, drain brush up a good point.
6.4.3 Lightning line is not straight, beyond tolerance, should cross the smooth vertical adjustment shall not exceed the allowable deviation.
6.4.4 clamp screw is loose, tighten the screws should be timely.
6.4.5 Deformation of the compensation process without making should make do.
6.5 Xiao belt and avoid equalizing ring
6.5.1 welding surface is not enough, weld slag, bite of meat, cracks, holes, etc., shall be repaired regulatory requirements change.
6.5.2 steel doors, iron railings ground lead omissions, should be promptly filled.
6.5.3 is not full at the ring beam welding torrefied not clean, drain brush rust. Should promptly welding, coating knock the net, brush on rust.
6.6 needle bending, vertical installation is beyond tolerance. Weight new needle should straighten, to meet the requirements before installation.
6.7 grounding line installation
6.7.1 The flat is not flat, should be re-adjusted.
6.7.2 Ground terminal drain pad spring pad, should be promptly filled.
6.7.3 There weld slag, bite of meat, cracks, pores and skin treatment drug is not clean and so on. Repair specifications should change.
6.8 drain brush rust, he shall promptly make up brush.
6.9 out independent population protection from lightning and grounding devices and roads or buildings do not meet the requirements. Its distance should be greater than 3m, when less than 3m, equalizing measures should be taken or laying gravel or asphalt ground.
When lightning deflectors 6.10 for the use of reinforcement, reinforcement cross-section of not less than 90mm2 addition, the method can be pressure submerged arc welding, butt welding and other mechanical methods can be cold extrusion, wire tapping, etc., than do joints lightning deflectors, but the need for covert project inspection and acceptance.
7, Quality Records
7.1 galvanized flat or round material descriptions and factory certification.
7.2 Lightning and Grounding construction preflight, self, hidden complete inspection records.
7.3 design change negotiation records, as-built drawings.
7.4 Lightning Protection sub-project quality inspection and assessment records.
Lightning protection, grounding construction points
Lightning fortification of three civil engineering, roofs generally use 25 × 4 galvanized flat steel parapet as lightning along with laying around, 25 × 4 galvanized flat steel lightning with support clamp spacing of about one meter, but must consistent vacant corner section is not more than 1 m, 0.15 m above the roof with lightning or decorative parapet, and roof with 25 × 4 galvanized flat steel composition ranging from lightning grid. Lightning grid laid along the roof, above the roofs of all the various metal components are connected with welding required and lightning.
Currently, the use of general civil or shear within the structure of the column as the main steel deflectors, welding is connected to the upper and lower reinforcement, the root diameter larger than 16 mm for the second group, the upper end of the column 100 × 100 × 8 embedded steel for column the main reinforcement and lightning en conversion.
Works mainly in the form of ground-based artificial grounding and use as a form of grounding. Use steel mesh cap, pile constitute potential ground network connection, such as steel, grounding resistance of less than 1 ohm.
Continuous within each building facades and floors of reinforced steel beams welded into one form equalizing ring, and reliably connected with deflectors, metal doors and windows on the exterior walls, metal structures, facades and railings are connected to prevent pressure ring sideswipe mine.
In recent years, increasingly stringent requirements of equipotential bonding, there are a total equipotential auxiliary equipotential, local equipotential. Room, bathroom equipment, metal pipelines generally equipotential ground.
(2) the construction process
Ground equipment installation construction preparation → → → deflectors installed with bracket fabrication and installation of lightning protection lightning network installation → → ground resistance testing
(3) technical measures
Materials range and meet the design requirements, construction machinery with adequate construction drawings for the construction team has conducted technical tests.
(4) The main construction methods
The works include grounding lightning protection and grounding, lightning and lightning deflectors installed belt. Construction standard for "grounding electrical equipment installation engineering construction and acceptance" (GB50169-92)
1) grounding device
a. accordance with the design requirements of the size of the position, the inner bottom two structural reinforcement welded connectivity, and with the relevant units through piles of welded steel columns inside and (at different elevations and down through the use of two vertical structure), and two reinforcement and marked with paint, lead and facilitate the inspection.
b. all weld seam should be plump and have sufficient mechanical strength, not a slag, after the bite of meat, crack, Weld, porosity and other defects, weld coating knock at the net, brush asphalt for preservative treatment, the use of ride when connected to welding, the weld length requirements are as follows:
● galvanized flat steel not less than 2 times the width, and at least three edge welding.
● welding galvanized round six times the length of its diameter, and should dihedral welding.
● galvanized and galvanized flat steel bar connected to a length of 6 times the diameter of the round.
c. everywhere After construction, quality inspection departments should promptly please covert project inspection and acceptance before being hidden after passing inspection records while doing covert project.
2) install deflectors
Circumstances make use of construction steel deflectors, reinforced cross-section must meet the design requirements.
Reinforced the connection to meet regulatory requirements, such as building construction using submerged arc welding process, may be processed, or to be grounded jumper, lap length of not less than six times the jumper bar diameter.
3) lightning protection zone
This project uses lightning with 25 × 4 galvanized flat steel.
. a bracket:
When civil construction roof structure should be buried with the bracket. All brackets must be strong, mortar plump, smooth vertical and horizontal. Brackets spaced not more than 1.5m and evenly spaced, tolerance 30mm. Corner corner from the center on both sides of the bracket is not greater than 250mm, stand in rows to check the levelness of each segment tolerance 2m 3/1000, but the full-length deviation of not more than 10mm.
b. lightning belt installation
● The galvanized flat steel straightening.
● lightning conductor installation should be straight, firm, may not have ups and downs and bending phenomena, from the building should be consistent flatness tolerance of each segment examination 2m 3/1000, but the full-length deviation of not more than 10mm.
● Ground Wire bend shall not be less than 90 °, the bending radius shall not be less than the diameter galvanized flat iron 2.5 times.
● Deformation of the buildings at the mine should be done across the handle.
4) Electrical Grounding Construction Methods
Currently, according to the "Residential Design Code" (GB50096-1999), grounding system mainly uses TT, TN-C-S or TN-S grounding, and total equipotential bonding.
a. high / low voltage power distribution room equipment grounding system, set up in the room of a 300mm from the ground level of the ground ring design requirements shall be in accordance with specifications around.
b. switchgear, power distribution panel (box), power transformers and a variety of electrical equipment, which may be charged by the insulation damaged metal housing, metal stents and drive mechanism used in stand-alone installation of electrical sockets grounding holes should be to a dedicated ground (PE line) connected branch reliable, PE grounding wire should be connected with the device and repeat grounded.
c When the protective wire (PE line) used the same materials and phase line, PE line minimum section shall meet the following requirements when using single-core PE insulated conductor wire, according to the mechanical strength requirements, the section should not be less than: mechanical properties when protection is 2.5mm2, when there is no mechanical protection for 4mm2.
A list of minimum cross-section PE line
Phase conductor cross section S (mm2) PE wire minimum cross section S (mm2)
d. all exposed ground test point shall be painted in red paint and a sign stated purpose.
e. automatic fire alarm systems, building equipment automatic monitoring system (BMS) and other electronic equipment room using a dedicated grounding wire, grounding devices introduced by the control room.
5) ground resistance testing
Ground Resistance Tester Model using ZC29B-2, the instrument must be measured by a professional. Before the test, the first galvanometer pointer zero, then placed the maximum magnification par multiples, slow roll, while adjusting the measurement scale plate, so that the galvanometer zero. Shake accelerate to around 120r/min, and then transferred to the balance, read dial scale, you have to multiply the resistance ratio measured. Note that the current probe cable length is 40m, potential probe wiring length is 20m.
HongHao Photoelectric technology lighting co.,LTD