1 scope
This technology is applicable to general
industry, civil construction engineering 1kV and below steel tubes for lighting
and power distribution lines and dark laying and laying pipe in the ceiling and
wall panels installation project.
2 construction preparation
2.1 materials requirements:
2.1.1 using pipes and equipment shall
conform to the provisions of the existing national technical standards, and
product certification.
2.1.2 specifications of pipes and equipment
shall comply with the standards and design requirements; steel terminal boxes,
junction boxes, pipe joints, claw-type fittings, angle bending, wire, pipes,
switch boxes, outlet boxes, such as the specification should support with the
Panel, cover Panel.
2.1.3 pipe clamps, brackets, hangers and boxes
and other ferrous metal parts shall be galvanized or brush paint; fasteners are
zinc plated.
2.1.4 by needed material: wire pipe, and
bent tube, and can flexible metal tube, distribution box, and wiring box, and
lamp box, and socket box, and straight tube joint, and claw type thread tube
joint, and tube card, and round, and angle, and flat steel, and bracket,
hanging rod, plating zinc bolt, and nut, and washer, and expansion bolt, and
plating zinc wood screws, and since attack screws, and iron nail, and shot nail
and the bullet, and anti-corrosion paint, and harmonic paint, and asphalt oil,
and oil, and cement, and sand, and wire, and ground clip,.
2.2 equipment:
2.2.1 withheld, and hand pipe Bender,
hydraulic opening, wheel saws, toothless saw, bench drill, hand drill, hammer,
electric welding machines, welding tools, nail guns.
2.2.2 special move, moving, hacksaw,
cutting, milling, flat-files, cabinet file, round file, wood RASP, flat-files,
hammer, chisel, drill bits, box spanner.
2.2.3 ruler, set square, tape measure,
level gauge Rod iron, red pencil, brush, dot punch, line, small line, Gray Ash
shovel, barrels, buckets, 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,
wall thickness of lines and equipment base line play, with the civil
construction.
2.3.1.2 precast concrete pipes on the
floor, hoisting in floor and adjust, floor before, playing level.
2.3.1.3 pipes in cast concrete slab, reinforced
after lashing out at the bottom, the upper bar is not binding before the wall
plates piping after the reinforcement.
2.3.1.4 the walls (masonry) complex
construction on riser.
2.3.2 out pipe laying:
2.3.2.1 combined with structural embedded
parts installed, set aside.
2.3.2.2 fixation by the picking method,
should be carried out prior to plastering; using expansion bolts fixing
bracket, should be carried out after the plastering.
2.3.2.3 piping should be carried out after
the spraying, painting of civil engineering.
2.3.3 the ceiling tube:
2.3.3.1 holes work combined with structural
embedded parts, set aside.
2.3.3.2 individual support, hanging pipes,
installed in ceiling joist construction; for laying pipeline on the main joist
of suspended ceiling, with the keel installation construction.
2.3.3.3 interior construction, with the
construction of ceiling lights and electrical equipment drawings, roof or
ground and pop up the actual location.
3 operational processes
3.1 process:
3.2 pipe, box, box, Stent precast:
according to the construction plans processing all kinds of pipe, box, boxes,
brackets. Wire and tube bending cold simmer method can be used and shaped bend.
By cold simmer: General, 25mm diameter or
less, you can use hand and simmering pipe, pipe-tube simmering, gradually
simmer the curvature required; 32mm diameter and above, you can use a hydraulic
pipe Bender.
3.3 pipe installation:
3.3.1 box, box location; according to the
axis of the construction drawings to determine cases, boxes, the civil eject
horizontal line as the benchmark, hang level, fall line alignment, standard out
of the box, the box of the actual location. Rows, the rows of boxes, boxes
should be telephoned or cross lines.
3.3.2 Dark match the wires of the pipeline
laid directly along the shortest route and should reduce bending; buried inside
the walls or concrete ducts and walls or concrete surface of clear space shall
be not less than 15mm.
3.3.3 tick slots: brick or masonry walls
need to pick your slot, slot line on both sides, with cold chisel tick. Slot
width and groove depth is larger than the outer diameter of the pipe 5mm is
appropriate. Prefabricated circular hole, the light drilling locations on the
floor, hit with a hammer from down to up; precast solid light on drilling,
first electric hammered holes above the plate, under the plate hammer, milling,
reaming size slightly larger than a light box.
3.3.4 pipe cutting: hacksaw, toothless saw
blade, abrasive cutoff saw cutting, will need to cut the pipe length is
accurate, card firmly in the jaw fracture flush does not skew, pipe scraped
smooth, Burr-free milling, tube iron away.
3.3.5 stable cartons, boxes: according to
the construction requirements of pipeline, pay attention to the orientation of
the extraction tube in machining cartons, boxes. Bricks, masonry walls and
precast boxes, boxes, holding strength not less than M10 cement mortar, mortar
should be plump, smooth, firm, coordinates correctly. Prefabricated floor Shang
of lamp box should installation good Katie and car rod, in floor following
installed supporting Board Hou again stability note; now business concrete wall
and the floor Shang of box, and box, should first installation good card iron
or car rod, will card iron or car Rod spot in steel Shang; as for wood template
Shi available nail, and fine wire will box, and box lashing fixed in template
Shang.
3.3.6 goes to the floor-standing
distribution box, screen of wires and piping, arrangement should be neat, tube
distribution box should be high Foundation not less than 50mm.
3.3.7 piping connections: straight fitting
connection, its length should be 2.0~3.0 times the pipe diameter, it tube
interface should be in straight fitting centre in 1/2. According to the pipe
lines with 90 ° angle at the elbow joint, it tube interface should be inserted
at right angles to the pipe spigot, and should be in place, and then use the
crimping crimp, which withheld shall be not less than two points. After
crimping, lead oil applied at the interface, its whole line to form the complete
unification of grounding.
3.3.8 line distance between two connection
points in the following length range, should be installed junction box.
Junction box location should facilitate threading and maintenance:
3.3.8.1 line when there is no bending, no
more than 30m;
3.3.8.2 pipes have a turn, not exceeding
20m;
3.3.8.3 pipeline has two round, no more
than 15m;
3.3.8.4 pipeline has three round, no more
than 8M;
3.3.9 tube into the box, the cases should
by of claw-type fittings. Using a dedicated move lock, claw-type designer to
good metal boxes, boxes meet the requirements of conductive ground. Box, box
opening should be neat, should coincide with the pipe diameter, requiring a
tube of a hole, no longer holes. Iron box, box of non-electric welding holes.
Two tubes above into the box, box length consistent, evenly spaced and neat.
3.3.10 fixed line:
3.3.10.1 pipe of reinforced concrete walls
and floor, every 1000mm on the reinforced with wire binding.
3.3.10.2 laying brick or masonry wall tick
Groove line, every 1000mm of wire, nails for fixing.
3.3.10.3 prefabricated pipes on a plate
with a circular hole, wire lashings for hole plate can be used.
3.4 next pipe laying:
3.4.1 processing according to design
brackets, hangers, hoop iron, as well as cartons, boxes, bending. Exposed pipe
laying technology with pipe laying process please see the relevant section of
the same Department.
3.4.2 corners (including shaped bends),
brackets, hangers prefabrication: Ming pipe bending radius of not less than 6
times the pipe diameter when only one bend between the two junction boxes, and
the bending radius should not be less than 4 times the pipe diameter.
Processing method using and shaping pipe by cold simmer. Brackets, and hanger should
be processed according to design drawings. Brackets, and hanger design
specifications provided for, shall be not less than the following provisions:
flat steel frame: 30mmx3mm; angle bracket: 25mmx25mmx3mm. Buried bracket
dovetail, burying depth should not be less than 120mm.
3.4.3 determination of cartons, boxes and
fixed points:
3.4.3.1 design measure box, box with the
exact location of outlet. Homemade is best used when measuring gauge rod.
3.4.3.2 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.
3.4.3.3 fixed point distances should be
uniform, it tube cards and terminals, turning point, electrical appliances or
junction box from the edge of the 150~300mm. Intermediate pipe maximum distance
shown in table 3-10.
Thin-walled copper pipe pipe clamp maximum
distance table 3-10
Pipe diameter (mm) 15~20 25~32 40~50
Maximum distance (mm) 1000 1500 2000
3.4.3.4 fixation methods: tube Expander
method, wooden block, embedded iron parts by welding, stabilizing injection,
hacking methods, hoop method.
3.4.3.5 fixed cartons, boxes: the
stereotypical boxes, boxes, required in boxes, boxes under 100~150mm and a
solid frame, fixed the tubes on the bracket. Box, the box should be firm and
smooth hole neatly, and coincides with the pipe diameter. Requires a one-hole,
no longer holes. Iron boxes, boxes of non-electric welding holes.
3.5 ceiling and wall panels in the tube,
its process and requirements: material and a fixed reference to the piping
process Ming; connections, curvature, direction and crimp the grounding may
refer to the dark laying technology requirements.
3.5.1 mixed drawing attention to structural
plans, building plans with ventilation, heating and plumbing, fire integrated
wiring diagram and their coordination, particularly in the professional
pipeline interchange, such as bathroom, passage key parts, samples should be
drawn in time. After it has been verified as correct, line positioning on the
roof or on the ground. Line of the ceiling is a square block lights, you must
press and practice as in Figure 3-10~12.
3.5.2 lighting position after position, in
no less than 2 screw the lamp box firmly fixed. If there is fire, fire or other
fire protection measures that are available. Conduit Circular box useless
knockouts, should not knock out has fallen off to mend.
3.5.3 pipelines should be laid above the
keel, it tube into the box, the box must be simmering light fork bent, with
claw-type fittings, with a special move lock, then withhold in withholding at
the junction of not less than 2 o'clock, in order to achieve good reliable
electrical grounding.
3.5.4 tube should be solid and smooth, or
prohibit the use of the Middle tube with legs. Fixed line spacing shall not be
greater than 1500mm. Conduit Circular box booms fixed through the boxes and
bending parts 150~300mm and clamp fixed on both ends.
3.5.5 the ceiling lamp-box can be used to
light metal flexible duct over the length should not exceed 1000mm. Special
connector for metal flexible duct should be used. Ceiling installation of
various boxes, boxes, boxes, boxes should be directed in the direction of
checkpoints.
4 quality criteria
4.1 project: 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, it tube connected
with the device in place. Ming tubing and brackets, and hanger should be
straight and strong, neat; no significant wrinkle in pipe bends, paint
corrosion integrity. Black pipe layer larger than 15mm.
4.2.2 the pipeline protective coating
complies with the following requirements:
4.2.2.1 through deformation joints
compensator, compensator should be formed, with movement, it tube smooth,
reliable connection fittings and pipes;
4.2.2.2 basis through the buildings and
equipment and protective sleeve. Protect casing in concealed works record label
is correct.
Inspection method: observation on concealed
works of checking and inspection records.
4.2.2.3 wiring protective tubes, boxes,
metal boxes, used throughout the line formed a complete grounding, alignments,
reasonable, brushing some pollution equipment and buildings.
Inspection method: Visual check.
4.3 allowable deviation (3-11):
5 finished product protection
5.1 pick slot may not be too big, too deep
and too wide. Brick walls should not be cross-slot. Prefabricated beams and
columns and prestressed floor slabs are not free to pick your slot holes.
Concrete floors and walls are not allowed to cut.
5.2 in-situ concrete floor slab when
piping, taken not to trample bars; civil when pouring the concrete, an
electrician should stay under guard to avoid vibration damaged piping and fine,
box shifting. In case of pipeline damage should be repaired in a timely manner.
-5.3 distribution piping and electrical
equipment installation, ceiling, walls and floors should be maintained clean
and complete. Removal of materials and
When using high bench machines, not damaged
doors, Windows, walls, and so on. Electrical lighting equipment after
installation, no further spraying. 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 tube walking brush paints
should not be contaminated walls, ceiling and 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 concave appears too large
or sufficient bend RADIUS multiple phenomena. Its causes and solutions are:
6.1.1 use lever when simmering bending,
moving to moderate, not too hard.
6.1.2 use when simmering tubes or hydraulic
hydraulic simmer camp, mold supporting, the seam should be on the side of the
tube.
6.2 black pipe bending too much blending,
laying pipe, according to the design requirements and site conditions, laid
along the routes, not around the bend can be significantly reduced.
6.3 embedded boxes, boxes, brackets,
hangers skew, or boxes, boxes with too many people coming in and going out a serious,
depending on the fix.
6.4 tick box, the box appears empty, to
recover good should be around when it is on a steady note boxes, boxes filled
with mortar, boxes, boxes on the mouth should be collected in a timely manner
and then stringing, equipment.
6.5 next plumbing, 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, immobilization span should
get even.
6.6 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.
6.7 tube is not cut, broken pipe fails to
milling, filed application filed flush nozzle, remove the Burr distribution.
6.8 cartons, boxes and fittings should be
carried out according to the process or cause poor electrical grounding; tubes
and tube connections, withholding should be used, or loose connection of the
pipe, poor electrical grounding.
6.9 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 joints doped lead oil, wrapping
twist in prison.
Quality of 7 records
7.1 tubing and accessories product material
certificates and certificate.
7.2 the withholding of thin-wall steel pipe
laying project pre-screening, hidden inspection, inspection records.
7.3 change record of negotiation and
completion.
7.4 project for quality inspection and
assessment records.
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