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Common quality problems in piping and threading - unqualified materials
Common quality problems of piping and threading - construction control is not available
Standard Points:
1. The spacing between the outlet pipes is small, which affects the waterproof construction
2. The spacing between multiple rows of concrete pipes is small, and the multi-layer pipes are crossed, which affects the quality of concrete vibration
3. The spacing between the booms in the ceiling is large and uneven
4. The piping of the open and dark distribution into the distribution box is uneven, and the grounding of the metal pipe is not standardized
5. The practice of piping through expansion joints is not standardized
6. The use of hoses is not standardized, and there are a large number of bare wires in the ceiling
Related standards, atlases
"Code for Acceptance of Construction Quality of Building Electrical Engineering" GB50303-2015
"Code for Construction and Acceptance of Wiring Engineering of 1kV and Below" GB50575-2010
"Regulations for the Construction and Acceptance of Socketed Tight Steel Conduits, Wires, and Pipelines" CECS120-2007
Electrical piping out of the exterior wall
Standard Points:
The spacing between steel pipes (the net distance between steel pipes is not less than 150mm)
Two layers of anti-rust paint on the inner wall of the steel pipe, and two layers of anti-corrosion paint on the outer soil covering
The mouth of the inner wall needs to be flared
Whistle piping
Standard Points:
The spacing of multiple rows of concrete piping pipes is small, which affects the quality of concrete vibration and causes leakage of roof panels and basement side walls
The spacing of parallel wire pipes in the concrete shall not be less than 25mm
The thickness of the concrete protective layer on the surface of the pipe buried in the wall or concrete should not be less than 15mm, and the thickness of the concrete protective layer of the buried pipe with fire protection and explosion-proof requirements should not be less than 30mm
Three-layer pipe crossing is not allowed
Exposed piping in the ceiling
Standard Points:
The exposed steel pipe should be arranged neatly, horizontally and vertically
The spacing of the fixing points is even, and the fixation is firm
The installation of equipment and lamps in the ceiling needs to be fixed with metal hoses and special joints to eliminate bare wires in the ceiling
Open piping + open box
Standard Points:
The exposed steel pipe should be arranged neatly, horizontally and vertically
The spacing of the fixing points is even, and the fixation is firm
The galvanized metal pipe is grounded in the box and connected by tinned with multi-core soft copper wire greater than 4 mm2
Wet places and galvanized layer damage should be treated with anti-corrosion
Plastic PVC pipes do not need to be grounded when entering the box
The pipe is threaded into the distribution box and the guard is intact
Dark piping + dark box
Standard Points:
The dark piping should be straight and neat, and the grounding should be good
The pipe mouth is leveled into the embedded box;
Plastic PVC pipes do not need to be grounded when entering the box
The pipe is threaded into the distribution box and the guard is intact
Expansion joint piping
Standard Points:
When the pipeline wears the expansion and contraction settlement joint, a metal hose (length can not exceed 2 meters) should be used for the transition, and the line should be grounded during construction
In-tube threading
Standard Points:
The color of the phase wire, the neutral wire and the protective ground wire should be distinguished, and the yellow and green double-color wire should be used as the protective ground wire, and the light blue wire should be the working zero line. Yellow, green, and red are phase wires, and white wires are used for switch control lines
Before threading, the wire pipe should first check the protection of each nozzle to ensure that the protection is complete and complete;
After threading, self-inspection and mutual inspection should be carried out according to the specifications and quality evaluation standards, and when it does not meet the requirements, it should be corrected immediately, check the specifications and number of wires, and then carry out insulation tests after inspection