Laying technology for steel tube

1 scope

This technology is applicable to the lighting and power distribution line pipe and dark laying and pipe laying works in the ceiling and wall panels.

2 construction of huaihe River

2.1 materials requirements:

2.1.1 galvanized steel pipe (pipe or wire) uniform wall thickness, weld evenly without splitting, trachoma, Thorn and the angled flat. Apart from galvanized pipe, other tubing rust-brushed paint in advance (when embedded in concrete, not brush paint, rust) galvanized or painted steel pipe outer layer of anticorrosive paint intact, no spalling phenomenon, with product materials, and certification.

2.1.2 hoop hoop use wild silk tubes. Wire and clear and no accusations, zinc coating integrity of flaking, no split ends smooth without burrs, and product certification.

2.1.3 the lock nut (parent) shape intact, thread clear, and product certification.

2.1.4 protection for difference between thin and thick pipe, care must be intact, and product certification.

2.1.5 iron lamp holder box, switch boxes, junction boxes, sheet metal thickness should be not less than 1.2mm, no zinc coating flaking, distortion-free welding, complete knockouts, panel mounting hole and the ground wire welded feet range and product certification.

2.1.6 Panel, cover Panel specifications, height and width, mounting hole from a box matching, shape intact, uniform color plates, and product certification.

2.1.7 round bar, flat bar, angle iron and other materials should comply with the relevant requirements of the State, zinc coating integrity and product certification.

2.1.8 bolts, screws, expansion bolt and nut, gasket, galvanized parts should be used.

2.1.9 other materials (such as wire, welding electrodes, anti-rust paint, cement, oil, etc) no date metamorphism.

2.2 the main tools:

2.2.1 simmering tubes simmered, hydraulic hose, hydraulic opening, threading plates, sleeves, pressure case.

2.2.2 hammer, chisel and hacksaw, flat files, cabinet file, round file, live spanner, fish tweezers.

2.2.3 pencil, tape measure, level, wire pendant, grey ash shovel, buckets, water bottles, oil drums, brush, pink bag, etc.

2.2.4 hand electric drill, drill, drill bits, nail guns, Riveter, insulated gloves, tool bag, tool box, high chair, etc.

2.3 operating conditions:

2.3.1 pipe laying:

2.3.1.1 horizontal lines on each floor and wall thickness of line play, with the civil construction.

2.3.1.2 precast concrete pipes on the Board, in the play ground before a horizontal line.

2.3.1.3 in-situ concrete slabs inside the tube, reinforced after lashing out at the bottom, before the upper bars are not binding, based on where the construction drawing dimensions combined with the civil construction.

2.3.1.4 finished precast slabs in place, in time to meet the construction finishing joints and anchoring the (beard-gluten), bend the pipe connection as required.

2.3.1.5 precast hollow plate, with the construction in place while piping.

2.3.1.6 walls (masonry), coordinating construction risers.

2.3.1.7 cast concrete wall pipes with large templates, completion of construction steel mesh straps, wall cord piping.

2.3.2 out pipe laying:

2.3.2.1 combined with civil engineering structure embedded parts installed.

2.3.2.2 in harmony with the construction decoration paints out the pulp after the completion of piping.

2.3.2.3 tube installation, must be carried out after construction plaster finish.

2.3.3 within the ceiling or wall panels, pipe laying:

2.3.3.1 structure construction, combined with civil engineering install embedded parts.

2.3.3.2 interior construction, with the construction of ceiling lights and electrical equipment drawings, and plates or eject the actual position on the ground.

3 operational processes

3.3 pipe installation requirements:

3.3.1 installation in dusty and humid places of wiring pipe, tube, pipe joints shall be sealed.

3.3.2 Dark match the wires of the pipeline should be laid along the shortest route and should reduce bending: buried within the walls or concrete pipes, surface distance should not be less than 15mm.

3.3.3 access to floor-standing distribution box of wires and piping, arrangement should be neat, it tube must be above the bedrock surface is not less than 50mm.

3.3.4 underground wires and pipes should not be through Foundation, through building foundations, the pipe should be protected.

3.4 operations:

According to the plan, processing all kinds of boxes, cartons, tubes bending. Steel tube simmering bending or heating method by cold simmer can be used.

3.4.1 cold simmer method:

General pipe diameter for 20mm and below, with hand and simmering tubes. First pipe of a simmering tube, progressive curvature required to simmer. Diameter of 25mm and above, using a hydraulic tube simmering, first into the tube, then flip a simmering tube, making the desired camber.

3.4.2 method of heating:

First fried dry sand, Plug one end of the pipe, dry sand will be pumped into the tube, hammer strokes, sand filling until solid, then connect the other end of tube blocked in turn the heating on the fire, simmered into the desired camber after fire, with the simmering bending with cooling. Require pipe bend must be creases, pockets and crevices phenomena, curved flat should not be greater than the pipe diameter of 1/10; dark when piping, bend radius should not be less than 6 times the tube diameter; when buried or concrete floor, not less than 10 times the pipe diameter.

3.4.3 pipes cut off:

Commonly used a hacksaw, cut pipe, no tooth saws, abrasive cutoff saw cutting, will need to cut the pipe length is accurate, card firmly in the jaw fracture flush does not skew, it tube scraper milling smooth, Burr-free, tube iron away.

3.4.4 pipe Threading:

Silk panels, casing, according to pipe outside diameter to select the appropriate die. Pressure pipe bench vise or gantry frame clamp firmly, then twisted in the pipe end, equal weight shall not be excessive, with the set with water coolant, threads not random but, the Elimination of residues and threads clean and clear. Diameter of 20mm and below, share second set; when diameter 25mm and above, should be divided into three sets.

3.5 determination of boxes and boxes position:

According to the design requirements of axis position of boxes, cartons, the civil eject horizontal line as the benchmark, hang level, fall line alignment, labeling the actual size of the box, the box location.

3.6 stable boxes, cartons:

3.6.1 stable boxes, cartons:

Stable box, box request pulp full, neat and firm, coordinates correctly. Boxes, box installation requirements shown in table 3-5. Now concrete wall fixed boxes, cartons and other iron fixation, boxes, the bottom is less than 3cm from the outer wall surface, need to add a metal mesh fixed before plastering to prevent cracks.

Installation requirements table box, box 3-5

Measuring project required tolerance (mm)

Levels of boxes, cartons, vertical position

Box adjacent to 1M elevation

Fixed box

Box fixed

Boxes, boxes and wall right

Consistent

Vertical

Vertical

Level 10 (brick wall), 30 (template)

2

2

3

Maximum depth of recessed 10MM

3.6.2 pallet stability note lamp boxes:

Prefabricated round hole Board (or other roof) playing lamp bit hole Shi, find good location Hou, with pointed cold chisel by Xia to Shang played, hole size than lamp box outside mouth slightly big 1~2cm, lamp box welding good Katie (available bridge Rod box) Hou, with high label mortar stability note good, and supporting Board supporting prison, stay mortar solidification Hou, can demolition supporting Board. Cast in place concrete floor, blocking the box well with bottom bar fixed prison after the pipe with a good, civil concrete construction complete.

3.7 connection:

3.7.1 pipe connection method:

3.7.1.1 coupling connection. There shall be no accusations; Tong coupling, coupling must be used. Good morning after pipe straps, mouthpiece. Exposed screw should be not more than 2 buttons.

3.7.1.2 Dark piping connection should be used for the casing, casing length is 1.5~3 times the connection pipe diameter; counterpart of the connecting pipe should be at the center of the casing, welded joints shall be welded solid and tight.

3.7.1.3 Groove (trumpet) welding. Diameter 80mm steel tube, you tube remove Burr, leveling the alignment. With gas heating tubes, heating for Hammer along the perimeter, point-by-point to beat out evenly out of the Groove, flush pipe Beveling the two surrounding weld tight.

3.7.2 tube and pipe connections

20mm diameter and diameter of steel tubes and a variety of wires and pipes must be connected with the coupling. Tube filed smooth, joints should be solid and tight. 25mm diameter steel pipes and above, or coupling connection casing can be used.

3.7.2.1 length pipe more than the following, you should install junction box and its location should be easy to thread. When there is no bending, 45m; there is a turn, 30m; there are two bending, 20m; there are three corners, 12m.

3.7.2.2 pipes laid vertically, according to conductor cross section set the junction box distance; 50mm2 and 30m; 70~95mm2,, 20m;120~240mm2,, 18m;

3.7.2.3 wire pipe and other pipe minimum distances shown in table 3-6.

3.7.3 tube into the box, box connection:

3.7.3.1 box, box opening should be neat and consistent with pipe diameter, requiring a tube of a hole, no longer holes. Iron box, box-no electricity, gas welding holes, and should be brushed paint. Styling box, boxes, the knockouts and tube diameter hours available metal washer pads or flush with mortar and plaster repair, no exposed holes.

3.7.3.2 tube into the box, box, dark pipes welded across the grounding line fixed on the edges, no tube with knockouts welding, tube Show box, must be less than 5mm. There is a lock nut and lock nut flat, exposing the lock nut screw for 2~4 button. Two tubes above into the box, box length consistent, evenly spaced and neat.

3.8 black pipe laying:

3.8.1 with the walls (masonry) distribution:

Brick, masonry gas concrete block walls, when wall pipe hollow brick walls, the tube is best on the wall Center orifice up to blocking well. To make the box flat elevation accurate, tubes can be made on the high 200mm, and good stability of the box, followed by a short pipe. Short tube into the box, box-end not Threading used jumper wire welding, tube and flat boxes, box. Cited on the possession when the ceiling and upper end of the tube should be simmered into a 90 ° bend and straight into the ceiling. From the roof down tube should not be too long, and is subject to reach the switch box and catchy. Build walls, first stable box followed by a short tube.

3.8.2 large formwork of concrete wall pipe:

Boxes, cartons can be welded on the reinforcement of the wall, and pipelaying. Every 1M about using wire banding in prison. Tube into the boxes, cartons and simmering light fork bending. Up the tube should not be too long, and the simmering bending shall prevail.

3.8.3 in-situ concrete floor slab and distribution:

First light, according to the thickness of the wall around the room, eject the crosshairs, to plug a box fixed firmly and pipelaying. When there are two or more boxes, to pull the line. As for lamps or fluorescent lamp, should the wood tiles. Tube into the box, box length should be fit, pipe every 1M about using wire banding in prison. If you have ceiling fans, lanterns or beyond 3kg lamps should be welded hangers.

3.8.4 prefabricated piping on a plate with a circular hole, such as coke cut cushion, pipeline protection needed concrete mortar. Soil pipe concrete mortar protection available, can also be wrapped in two layers of glass cloth, brush three asphalt oil to protect it. In line with rocks under mat 50mm, minimize joint, coupling connection oil wrapping twist in prison.

3.9 processing of deformation joint:

3.9.1 slot handling practices:

Embed a junction box slot on each side, first fix the junction box on one end of the tube, bottom of the wiring on the other side of the long holes are arranged vertically, the aperture length width not less than twice times the tube diameter by access. Connect the compensation on either side across the grounding line such as 3.9.2 common junction box on the floor (below) of the practice:

3.9.2.1 common junction box on the floor (below) practices of the Department (a):

Boxes from the ground shall not be less than at the end of 300mm, after the pipe bend 90 °, it tube into the inner and outer lock nut should be added; while in the lower part of the plate, junction box from the roof distance should not be less than 150mm, as shown in Figure 3-6.

3.9.2.2 the common junction box on the floor (below) practices (ii) basic approach with (~), (ii) uses a tube junction box, as shown in Figure 3-7.

3.10 the ground wire welding:

3.10.1 pipe overall ground connection should be made through the deformation joints should have earthing compensation device. Such as the bridging method to connect across both ends of the ground wire welding surfaces shall be not less than 6 times of the jumper section. Weld even solid welds to clear coating, brushing paint. Jumper the specification shown in table 3-7.

Across the grounding line spec sheets (mm) table 3-7

Diameter round bar steel

15~25

32~38

50~63

≥70 φ5

φ6

φ10

φ8×2 —

—

25x3

(25x3) X2

3.10.2: galvanized steel pipes or flexible metal wire protective tubes, dedicated ground wire connection card should not be used for fusion welding connect the ground wire.

3.11 out laying the basic requirements: according to the design drawing brackets, hangers, hoop iron, as well as a variety of boxes, box, tube bending. Exposed pipe laying technology with pipe laying process please see the relevant section of the same Department. In the dust, explosive and other places with tube should be related to explosion-proof design and practice for the construction.

3.11.1 Guan Wan, brackets, hangers prefabrication: Ming pipe bending radius not smaller than the pipe outside diameter 6 times. If there is a turn, not less than 4 times the pipe diameter. Processing methods can be used and heating method by cold simmer, brackets, hangers should be according to the design requirements for processing. Brackets, and hanger design specifications provided for, shall be not less than the following provisions: flat iron bracket 30mmx3mm; angle bracket 25mmx25mmx3mm; buried bracket dovetail, burying depth should not be less than 120mm.

3.11.2 determination of boxes, cartons and fixed point

3.11.2.1 design measure box, box with the outlet, such as the exact location. Homemade is best used when measuring gauge rod.

3.11.2.2 boxes, boxes for the determination of position, to play the pipe vertical, horizontal, outlet, fixed spacing in accordance with standard size requirements, calculate and determine the location of brackets, hangers.

3.11.2.3 fixed point distances should be uniform, it tube cards and terminals, turning point, electrical appliances or junction box from the edge of the 150~500mm intermediate pipe maximum distance shown in table 3-8.

3.11.3 fixation methods: tube, wood bricks, embedded iron parts by welding, stabilizing injection, hacking methods, hoop method.

3.11.4 box, box is fixed:

Leads from the ground when you made on line to mingpan, can be welded directly onto the angle bracket, shaped plates, boxes, needed a plate, box 100~150mm and firm stand, tube fixed to the bracket. Boxes, cartons should be firm and smooth installation, opening and neatly coincides with the pipe diameter. Require a hole of tube must not be longer. Iron boxes, electrical welding holes in box is strictly prohibited.

3.11.5 pipeline laying and connection:

3.11.5.1 tube:

Horizontal or vertical piping allowable deviation laying out line when 2m deviation 3mm, length should not exceed 1/2 of the inner diameter of the pipe.

A check that the line is open, there are no burrs on the inside, or zinc coating antirust paint is intact, should straighten the pipe is not straight.

B apply pipe, pipe screw at one end of the card into half and then laying in tubes, individually twisted in prison. When using the iron bracket, steel can be fixed on the bracket, not welded on the other pipes.

3.11.5.2 pipe connections: pipe connection threaded connection should be used, or to withhold the pipe connections.

3.11.6 pipe connected to the device:

Within the pipe should be routed to devices which cannot be directly entered, shall meet the following requirements:

3.11.6.1 in dry premises, can be introduced at the pipe outlet and hose protection device, nozzle should wrap tightly.

3.11.6.2 outdoors or in damp rooms, nozzle installed waterproofing at elbow, protected by waterproof elbow lead wire should be insulated hoses, bent it into a waterproof radians, then the introduction of equipment.

3.11.6.3 spout height generally should not be less than 200mm.

3.11.6.4 buried within the pipe, you should brush after wrapped glass fiber cloth of asphalt, asphalt oil brush. Or cement mortar full protection should be used.

3.11.7 metal hose into devices, shall meet the following requirements:

3.11.7.1 metal hose and pipe or device connections, should adopt the metal hose connector, length should not exceed 1M.

3.11.7.2 metal hose clamp is fixed, fixed spacing should not be greater than 1M.

3.11.7.3 metal hose must not be used as a grounding conductor.

3.11.8 slot:

Ground wire welding and processing method see 3.9 and 3.10, part of the building. Ming jumper should be close to the coupling of piping, welded uniformly elegant and sturdy. Pipeline laying should ensure smooth, brush paint paint, blending, without fail.

3.12 the ceiling, Wainscoting in the tube, its process and requirements: material, fixed reference to the piping process Ming; connections, curvature, to may refer to the concealed process requirements, such as construction, junction box use the cassette.

3.12.1 triage drawings and professional coordination such as ventilation and heating and plumbing, and draw the sample after it has been verified as correct, line positioning on the roof or on the ground. If ceiling is a block of lines, lamps, must block, as shown in figures 3-8 and 3-9. Wainscoting in the piping shall be according to the design requirements, measurement box, bin location, line positioning.

3.12.2 after determination of light, in no less than 2 screw lamp box firmly fixed. If you have fire protection requirements, fireproof cloth or other fire safety measures to deal with lamp holder cartridge available. Useless knockouts should not knock off has come back together.

3.12.3 pipelines should be laid above the keel, it tube boxes, boxes must be simmering light fork-bending, and inside and outside with lock nut. Using trim, it tube into the box, box lock nut flat.

3.12.4 the fixed pipeline, such as the tubes on either side of a wooden keel you can nail, nail with lashing wire, then. As for light steel keel, supporting pipe clamps and screws can be used, or fastened with a rivet. Diameter 25mm and row road

Should be set separately.

3.12.5 lantern, large lamps, ceiling fans and other electrical equipment of more than 3kg of fixed, embedded in the construction of iron or steel hook, depending on load considering hook diameter, generally calculated by hoisting five times to achieve solid and reliable. Round steel diameter should not be less than 6mm, hook with preservatives. Dive into the lampholder with boxes from the light box should not be greater than 1M, in order to observe the maintenance.

3.12.6 tube should be solid and smooth you do down the tube or mixed with legs. In case of filament took over, must be at the end of the coupling nut. Fixed line spacing shall not be greater than 1.5M. Force lamp box of hangers fixed tubes in the box office and curve ends at 15~30cm plus fixed card.

3.12.7 the ceiling lamp-box can be used to light fire retardant Prica transition metal hose, length should not exceed 1M. It should use a dedicated connector on both ends. Ceiling box, box installation box should be directed in the direction of checkpoints to facilitate maintenance.

4 quality criteria

4.1 project:

4.1.1 the wire and wire to the insulation resistance value must be greater than 0.5M. Inspection method: measuring or checking insulation resistance test record.

4.1.2 thin-walled steel tube welding connections is strictly prohibited. Inspection method: Ming established visual check, set the check concealed work record.

4.2 Basic project:

4.2.1 connection close tube smooth, retaining complete, out plumbing and brackets, hangers should be straight and strong, neat, no significant wrinkle in pipe bends, paint preservative full, dark piping cover more than 15mm.

4.2.2 box, box is set up correctly, reliable and pipes into the box, the box straight, in box, box with length less than 5mm; nozzles are secured with locking nut, pipes exposed lock nut screw for 2~4 button. Lines entering the tube is correctly positioned for electrical equipment and appliances. Inspection method: observation and standard checks.

4.2.3 pipeline protection shall comply with the following requirements:

Through the deformation joints compensator, compensator can move freely through buildings and equipment based protective sleeve. Compensation device flat tube smooth, and firm and reliable connection of the pipe; protected casing in concealed works record label is correct. Inspection method: observation on concealed works of checking and inspection records.

4.2.4 metal wire and protective tubes, boxes, cartons and bracket ground (zero). Non-conductive parts of the electrical equipment and ground (zero), the extension installation should comply with the following requirements: connection relationship, grounded (neutral) wire cross section right, part of the required corrosion protection coating evenly without missing, alignments, reasonable, accurate color, and paint without contaminating equipment and buildings. Inspection method: Visual check.

4.3 allowable deviation:

Wire and tube bending radius, laid pipe installation tolerances and inspection methods should meet the requirements of table 3-9.

5 finished product protection

5.1 pick slot may not be too big, too deep or too wide. Precast beam-column joints with prestressed floor slabs are not free to pick your slot holes. Concrete floors, walls and so on are not allowed to cut.

5.2 in-situ concrete floor slab when piping, be careful not to trample on steel construction when pouring the concrete, an electrician should stay under guard, so as to avoid vibration damage when pipes and boxes, box shifting. In case of pipeline damage should be repaired in a timely manner.

-5.3 distribution piping and electrical equipment should keep the ceiling, walls and floors clean and complete. When transporting material and use a stool tool shall not be damaged doors, Windows, walls and so on. Electrical lighting equipment after installation, do not spray again, when you have to spray, electrical equipment and apparatus shall be protected and then spray.

5.4 stability ceiling boxes when piping, don't trample on the keel. No stepping on a wire pipe walk, brush paint not pollution such as wall, ceiling or wall panels.

5.5 other specialized in construction, attention must not touch broken electrical piping. Changed wires and tubes and electrical equipment without permission is strictly prohibited.

6 quality problems to be noticed

6.1 simmer bend appears concave flat too large or sufficient bend RADIUS multiple phenomena. Its causes and solutions are:

6.1.1 use lever simmering tubes when moving to moderate, not too hard.

6.1.2 use hydraulic pipe pipe simmer or simmer time, mold supporting, both sides of the seam of the pipe should be.

6.1.3 heat while simmering, sand filled, even heat, spiral bending the cooling should be appropriate.

6.2 black pipe bending too much blending, laying pipe, according to the design requirements and site conditions, laid along the shortest route, not around the bend can be significantly reduced.

6.3 embedded box, boxes, brackets, hangers skew, or box, box with too many people coming in and going out a serious, depending on the fix.

6.4 tick box, the box appears empty, close is not good, when you should be on a stable note box, and around them filled with mortar, boxes, cartons must be collected in a timely manner and then thread on appliances.

6.5 reserved the position of nozzle is not accurate. Piping is not according to the design requirements, find axis dimensions, resulting in inaccurate positioning. Should be fixed according to design requirements.

6.6 cross-grounding wire and pipe welding line, it tube weld leakage, welding is not strong, leak-welded, welding surfaces enough times, primarily the operators do not have a strong sense of responsibility, or the level is too low, should strengthen the operational responsibility and technical education, in strict accordance with the specifications for welding.

6.7 out piping, ceiling or sheathing pipes, fixed point jail, screw loose tiekazi, fixed spacing is too large or is not uniform. Supporting pipe clamp should be used, fixation, span should get even.

6.8 dark match plugged pipes in time after Gordon found that pipe repair. Piping should be added in a timely manner after jammed tight shutoff nozzle.

6.9 rough alignment a Burr, broken pipe fails to milling, filed application filed flush nozzle, remove the Burr distribution.

6.10 lax weld damaged galvanized, welded joints shall be welded, galvanized by the destruction layer, should promptly make up brush paint.

7 quality records

7.1 welding galvanized metal pipe (thick-walled pipe) or wire tube (tube) and its annex should be material test reports and product certification.

7.2 pipe dark (Ming) laying of pre-screening, self-inspection, mutual inspection records.

7.3 change record of negotiation and completion.

7.4 project for quality inspection and assessment records.