The wire boxes and pipes of other appliances shall be grooved and laid after the wall masonry is completed.
The minimum thickness of the protective layer of the pipe shall not be less than 15mm, and the uneven place of the floor (house) surface shall be leveled.
5、 Pipe sweeping and threading After the pipeline is laid, the pipeline shall be cleaned in time, the pipe orifice shall be blocked, the box orifice shall be sealed, and the pipeline shall be threaded after the civil construction is completed…
The galvanized steel pipe cannot be welded, but can be crimped with copper wire of not less than 4m ㎡ with special grounding crimping clip.
When the steel pipe (thickness not less than 2mm) is connected by screw thread, the round steel with diameter not less than 6mm shall be used for welding.
The outer diameter of the pipe shall not exceed 1 / 3 of the thickness of the concrete slab.
The piping and the concrete surface shall not be less than 15mm, otherwise the floor slab is prone to cracks.
Pipe laying in balcony and awning plate: The stress condition of cast-in-situ concrete balcony and awning plate is that the upper part is tensioned and the lower part is compressed, so the reinforcement mesh is set in the part.
The method is the same as that of open application.
The piping in the wall of cast-in-place rod shall take a shortcut (it is not necessary to be horizontal and vertical), which shall be laid between two layers of reinforcement, and the pipe and reinforcement shall be bound firmly.
It shall be laid near the middle position of the beam, at least 50mm from the upper part of the beam bottom reinforcement.
The pipe should be padded on the formwork at least 15mm high.
Laying of pipes in cast-in-situ concrete floor slab: After the formwork of the cast-in-situ floor slab is erected and before the reinforcement is placed, the electrician shall snap the cross line according to the edges of the walls and beams around the room to determine the accurate position of the lamp position.
K.
The binding point at the box inlet shall not be greater than 0.3m.
The exposed section shall be protected by steel pipe, and the buried end of the steel pipe shall be sawed into a 30-45 degree inclined mouth to increase the underground fixed length.
Pipe laying in the ground: Generally, the pipes are laid in the triad cushion, and the cushion shall be tamped and leveled before laying.
Pipe laying in cast-in-situ concrete wall: The piping in the cast-in-situ concrete wall shall be connected with the pipe box first, and the box (box) laid in the wall shall be in the reinforcement grid.
The light box, switch box and socket box on the inner wall of the cast-in-place rod concrete column shall be laid in the middle of the column.
Pipe laying in floor (roof) cushion (post cast layer): The thickness of the cushion (post cast layer) shall be able to protect the pipe.
The steel pipe shall be used as the casing to leave the end of the column as far as possible.
4、 Concealed pipe laying Steel pipes are often used for piping in cast-in-situ concrete frame, especially for power lines.
Pipe laying in cast-in-situ concrete column: The pipe shall be laid in the middle of the column and bound and fixed with the main reinforcement or stirrup every LM.
The position and size of the lamp cap box shall be marked on the concrete slab, prestressed hollow slab, cast-in-situ concrete floor slab and precast thin concrete floor slab.
When piping in the coke slag cushion (other insulation layers) on the floor (house) surface, the pipeline shall be protected with cement mortar with a thickness of not less than 50mm before the cushion construction, so as to prevent the pipeline from mechanical damage.
The binding point shall be no more than 1m away, and a point shall be bound near the box.
Rigid PVC pipes with high strength can be used for lighting lines and weak current systems, and steel pipes shall be protected at important parts of the structure.
The bending angle shall not be less than 90 degrees.
When laying the pipe in the balcony awning, it should be carried out after the bottom formwork is supported and before the reinforcement is bound.
Pipe laying in cast-in-situ concrete beam: When the pipe needs to cross the beam, the position of crossing the beam shall have some distance from the beam end and pass through the middle of the beam; When the pipe needs to pass through the beam vertically, it is best to pass through near 1 / 3 of the clear span of the beam, where the stress of the beam is the smallest; When the pipe is laid horizontally in the beam, the plastic pipe shall be laid at a certain distance from the main reinforcement.
1、 Snap line positioning According to the requirements of design I drawings, determine the position of boxes and boxes at brick walls, large formwork concrete walls, sliding formwork concrete walls, wood formwork concrete walls, composite formwork concrete walls, etc., and snap lines for positioning.
The pipeline laying shall take a shortcut without being parallel and vertical to each other.
When the pipe leads out of the column, in order not to stretch out the formwork, a casing shall be sleeved at the pipe orifice and glued.
The lamp position box shall also be buried in slab joints as far as possible (DF type).
50.
Pipe laying in hollow brick partition wall of frame structure: When the pipe is laid horizontally in the hollow brick wall, a row of ordinary bricks can be changed in the piping layer, or a section of concrete can be poured to protect the pipe.
It shall not be bound with the main reinforcement.
Pipe laying of precast hollow floor slab: For concealed laying of prefabricated hollow floor slab pipes, they can be laid in slab joints or slab holes, and pipes cannot be laid horizontally.
When the hollow brick is laid horizontally, it can also pass through the hollow hole of the hollow brick.
The pipe should be connected with the lamp position box, the box should be blocked tightly and firmly fixed with the formwork.
F.
When using wood formwork, the lamp box can be nailed to the wall with nails On the formwork, the pipe shall be kept at a certain distance from the reinforcement and tied tightly.
The outer end of the casing shall be blocked tightly, closely attached to the formwork and fixed, and directly poured into the concrete.
J.
A.
3、 Stable buried box Box holes can be reserved, or holes can be dug to bury the box stably, and then short pipes can be connected.
When passing through the cast-in-situ concrete column horizontally, the structural strength of the column is weakened.
D.
E.
After the floor slab bottom reinforcement is bound and padded, the piping shall be carried out before the gluten (some called cover iron) is bound, the pipeline shall be laid between the two layers of reinforcement, and the gluten shall be bound after the piping is completed.
If the lamp position is not slab joints, holes can be made in the slab holes to bury the box (ordinary lamp cap box shall be used), but the slab ribs shall not be damaged.
When the steel pipe is bent, the flattening degree shall not be greater than 10% of the outer diameter of the pipe.
2、 Processing pipe bending Cold snuggling method and hot feeding method can be adopted for prefabricated pipe bending.
1.
C.
G.
First connect the pipe with the box, and use waste paper to wrap plastic film or plastic film to wrap sawdust or hemp rope to block the box tightly, so as to avoid sand slurry during pouring.
For the pipes laid on the ground, the height of the pipe orifice exposed to the ground shall not be less than 200mm, and shall be vertical to the ground.
Pipeline over deformation joint When the pipeline passes through the deformation joint (settlement joint) of the building, junction boxes shall be buried on both sides as compensation devices.
H.
It shall be ensured that there is concrete wrapped around the main reinforcement, so that the mechanical strength of the beam can be guaranteed.
Pipe grounding Pipes and pipes, pipes and boxes shall be electrically connected.
Pipe laying of aerated concrete block partition wall of frame structure: For the pipe laying of the block partition wall on the aerated concrete, except the distribution box, it shall not cooperate with the wall laying and embedding.
B.
