The length of the pipe entering the box shall be appropriate, and the pipe shall be tied with lead wire every 1m or so.
When there are more than two boxes, draw a straight line.
When the pipe diameter is 25mm and above, hydraulic simmer bender shall be used.
See the construction method of concealed pipe laying for the same process of open pipe laying and concealed pipe laying.
After the laying of concealed pipes is completed, on the basis of passing the self inspection, the owner and the supervisor’s representative shall be notified in time for inspection and acceptance, and carefully and truthfully fill in the acceptance records of concealed works.
b) Determine the position of boxes and boxes, determine the axis position of boxes and boxes according to the design requirements, take the horizontal line popped by civil engineering as the benchmark, hang the line for alignment, and mark the actual size and position of boxes and boxes.
Steel pipes above G50 shall be cut into pipe heads with large steel pipes, one end shall be welded and sealed with steel plates, then sleeved on the pipe ends, and then the two points shall be temporarily fixed by spot welding, and the welding points can be opened when in use.
Solar power stations, solar water heaters, electric vehicles and energy storage power stations are all based on the mass production of batteries, and solar cell production is the demand side of purification projects.
The length of more than two pipes entering the box and box shall be the same, with uniform spacing and orderly arrangement.
Pipe hoop connection φ 6.
Connection of pipe into box and box: the opening of box and box shall be neat and consistent with the pipe diameter.
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If the lamp exceeds 3kg, the suspender shall be welded.
The clear distance from the surface of pipes buried in walls or concrete shall not be less than 15mm; Buried wires and pipelines shall not pass through the equipment foundation.
The cutting fracture shall be flush without skew, the pipe orifice shall be scraped and filed smoothly without burr, and the iron filings in the pipe shall be removed.
Prefabrication of pipe bending, support and hanger: the bending radius of exposed piping or piping in buried brick wall shall not be less than 6 times of the outer diameter of the pipe.
② Open pipe laying the construction procedure of open pipe laying is as follows: construction preparation → simmer bending, support and hanger of prefabricated pipe → determine the position of box, box and fixed point → support and hanger fixation → box and box fixation → pipeline laying and connection → deformation joint treatment → grounding wire jumper.
Thank # warm Meng for pursuing excellence and Zhai Lijuan for sharing the materials.
After the partition wall is built, stabilize the box first and then connect the short pipe.
Electrical system and lighting installation 4.10 3.1 electrical piping and threading in pipe ⑴ main construction methods ① concealed pipe laying construction procedures for concealed pipe laying: construction preparation → simmering bending of prefabricated pipe → determination of box position → fixing box and box → pipeline connection → deformation joint treatment → grounding wire jumper; The basic requirements for concealed pipe laying are: the wire pipeline, pipe orifice and pipe connection laid in dusty and humid places shall be sealed; Wires and pipelines shall be laid along the nearest route and bending shall be minimized.
4.10.
When the pipe orifice enters the box and box, the pipe orifice shall be locked with a nut, and the thread exposing the locking nut shall be 2 ~ 4 threads.
II pipe cutting: use hacksaw, pipe cutter and grinding wheel saw to cut the pipe, measure the size of the pipe to be cut, put it in the jaw and clamp it firmly for cutting.
It is strictly forbidden to open holes in iron boxes and boxes by electric welding and gas welding, and apply antirust paint.
III pipe threading: threading plate and casing machine are used.
a) Simmer bending of prefabricated pipe I steel pipe: when the pipe diameter is 20mm and below, use a hand plate simmer bender.
The opening on box and box shall be opened with a hole opener to ensure that the opening is free of burr.
When the threading plate is used, the corresponding die shall be selected according to the outer diameter of the pipe, and uniform force shall be applied during threading; When using the threading machine, pay attention to pouring the coolant in time, ensure that the threads are not disordered or too long, eliminate slag and chips, and ensure that the threads are clean and clear.
The bending radius of piping embedded in concrete shall not be less than 10 times of the outer diameter of the pipe.
3.
The round steel shall be welded and bridged, the threading shall not be disorderly buckled, the pipe orifice shall be filed flat, smooth and flat, the pipe hoop must use the through wire pipe hoop, the joint shall be firm and tight, and the exposed wire shall not be more than 2 buckles; Steel pipes with a diameter of 25mm and above can be connected by pipe hoop or welded by casing.
d) The concealed laying method of pipe follows the wall (masonry) piping: when building a wall riser in cooperation with civil engineering, the pipe shall be placed in the center of the wall, and the pipe opening upward shall be sealed to prevent the pipe from being blocked by cement mortar or other sundries.
If the pipeline exceeds the following lengths, the junction box shall be installed, and its position shall be convenient for threading: 30m without bending; 20m when there is a bend; 15m when there are two bends; When there are three bends, 8m.
The butt joint of connecting pipe orifice shall be in the center of casing, and the welded junction shall be firmly and tightly welded.
Cast-in-situ mixing Concrete floor Piping: first find the correct position, pop up the cross line according to the thickness of the walls around the room, fix the blocked box firmly, and then lay the pipe.
After the end of steel pipes below G50 is buckled, one end of the pipe joint shall be welded and sealed with steel plate, and the other end shall be installed at the end of the pipe, which can be unscrewed when in use.
Although the specifications of supports and hangers are not clearly specified in the design drawing, they shall not be less than the following specifications: flat iron support 30 × 30mm； Angle steel support 25 × twenty-five × 3mm。 Measuring the position of boxes, boxes and fixed points: first measure the accurate position of boxes, boxes and outlet according to the construction drawings, then pull the vertical and horizontal direction of the pipeline out of the straight line according to the measured position, and determine the specific position of supports and hangers according to the spacing dimension requirements of fixed points specified in the installation standard..
Measures must be taken to prevent sealing of buried pipes.
When there is a ceiling for the upward lead pipe, the upper end of the pipe shall be bent into the ceiling at 90 º, and the lead pipe from the top plate downward shall not be too long, subject to the upper opening of the switch box.
c) Steel pipes with pipe diameter of 20mm and below must be connected with pipe hoop screw thread.
The length of casing is 1.5 ~ 3 times of the connecting pipe diameter.
It is required that one pipe shall have one hole and no long hole shall be opened.
