The slag and chips shall be removed, and the screw thread shall be clean and clear.
3) during casing installation, the prefabricated casing shall be sleeved on the pipe and placed at the specified position along with the installation of main pipe, riser and branch pipe The casing of the floor slab shall be welded with frame iron at appropriate parts, but on the ground of reserved holes to prevent falling off.
2.
7) During concealed laying, the bending radius of the pipe shall be greater than 10 times of the outer diameter of the pipe (as shown in the figure above); the bending radius of the pipe during open laying shall not be less than 6 times of the outer diameter of the pipe, or 4 times of the outer diameter of the pipe in case of one bend; the flatness shall not be greater than 0.1 times of the pipe diameter; 8) when the galvanized steel pipe is concealed in the reinforced concrete structure, the line pipe shall be bound and fixed with the reinforcement, the spacing shall not be greater than 1.5m, and the turning shall not be greater than 0.3m, and the line pipe shall not be welded and fixed with the reinforcement; 9) When the galvanized steel pipe is laid in the ceiling, the pipeline shall be fixed with a special pipe clamp, the distance between the fixed points shall be uniform, and the distance between the pipe clamp and the terminal, turning midpoint, electrical appliances or junction box edge shall be 150-300mm.
When embedding the upper and lower casings, the center line shall be vertical..
When the steel pipe is bent, the weld shall be placed on the left and right sides.
If there are grid lines on the ceiling, It shall be evenly divided according to the grid (as shown in the figure below).
When the pipe diameter is 20mm or less, it shall be sleeved in two plates; When the pipe diameter is 25mm or above, it shall be sleeved in three plates; The threading position shall be painted with anti rust paint for anti-corrosion.
Production and installation of waterproof casing 1.
First, select the corresponding die according to the outer diameter of the pipe, then tighten the pipe firmly with bench vice or gantry pressing frame, and then put the hinge plate on the pipe end.
After the pipeline is installed and aligned, adjust the gap, fix it and seal it.
When the hydraulic pipe bender is used First put the pipe into the mold, and then pull the pipe simmer to simmer the required curvature.
When the water supply and drainage pipeline passes through the fire floor, building the outer wall and partition wall, it shall be provided with casing, and the diameter of the casing shall be 2 times larger than that of the main pipe and riser passing through the wall and board Generally, the inner diameter of the casing shall not exceed the outer diameter of the pipe by 6mm.
When laying pipes on the ceiling, the distance between the embedded lamp cap box and the lamp box shall be less than 0.5m; 14) the path of concealed piping shall be laid along the nearest line.
Schematic diagram of casing installation 1) the specification and length of the casing shall be determined according to the thickness and pipe diameter of the structure.
2) during the installation of waterproof casing, it must be poured and fixed at one time with concrete construction wall In (wall), the filler in the casing shall be filled at last, and the filler shall be tamped tightly.
Galvanized steel pipe laying process 2.
The casing shall be fixed on the binding reinforcement by welding.
The grounding wire between the grounding cards shall be of the same specification as the grounding wire of the conductor penetrated in the pipe.
The screw thread shall not be disordered or too long.
The pipe and box shall be fixed with lock nut, which shall be fastened firmly, and 2-3 threads shall be exposed; 12) The galvanized steel pipe shall use the special wiring card as the grounding wire.
It is required that there is no wrinkle, concave flat and crack at the simmering bend; 6) According to the design drawing and the actual situation on site, some fixed length steel pipes shall be prefabricated and threaded with a threading machine.
The top of the casing is 20mm higher than the finished ground and 50mm higher than the kitchen and toilet ground.
Process requirements 1) before laying, check whether the pipeline is smooth, whether there are burrs on the inner side, and the pipe must be straightened if it is not straight; 2) The outer wall of all pipelines embedded in concrete shall not be painted; 3) Use hacksaw, toothless saw and grinding wheel saw to cut the pipe, accurately measure the length of the pipe to be cut, firmly clamp it in the jaw, the fracture is flush without skew, the pipe orifice is scraped and milled smoothly without burr, and the iron filings in the pipe are removed; 4) According to the requirements of the design drawing, determine the actual axis position of the box and box, take the axis popped out by the civil engineering and the horizontal line as the benchmark, hang the line for leveling, align the line drop, and mark the actual axis position and actual size position of the box and box, To understand each room (Hall) the ground and ceiling structure shall meet the requirements of secondary connecting pipe and piping in the ceiling, and make the distance between the outer cover and bottom edge of the box and box and the final ground meet the specifications and design requirements; 5) when the pipe diameter is less than 20mm, use the hand wrench pipe bender for bending, and when the pipe diameter is more than 25mm, use the hydraulic pipe bender for bending.
3.
The force shall be uniform without excessive force.
2、 Casing fabrication 1 wall casing length = wall thickness + plastering thickness on both sides of the wall 2 floor casing length = floor thickness + plastering thickness at the bottom of the board + floor plastering thickness + 20mm (50mm in kitchen and toilet) 3 Foundation casing length = foundation thickness + 30mm + 30mm (30mm at both ends respectively) 4.
The coolant shall be poured with the sleeve.
steel pipe laying 1.
The through pipe holes in the floor, partition and wall shall be blocked after the installation of pipes.
The steel pipe casing shall be 50mm higher than the indoor ground and roof, and strict waterproof measures shall be taken.
The end of the casing installed on the wall shall be flush with the finish.
After the pipeline is prepared, it shall be submitted for inspection in time and completed at the same time with the concrete pouring construction of civil engineering; II.
After the wing ring and steel casing are processed, the interior shall be painted with anti-corrosion paint for anti-corrosion treatment.
If the size of the casing is too large, the reinforcement shall be cut off, and finally the reinforcement shall be welded according to the specification requirements.
The maximum distance between pipe clamps in the middle is shown in the following table: 10) the galvanized steel pipe must be connected with a through wire pipe clamp, the pipe orifice shall be aligned in the middle of the pipe clamp, and 2-3 buckles shall be exposed; 11) When the steel pipes enter the lamp cap box, switch box, junction box and distribution box, they shall be arranged in order, one pipe and one hole.
When laying the pipe, first screw in half the screw at one end of the pipe card, and then lay the pipe in the pipe card and screw it firmly one by one; 13) When installing lamp piping on the top plate, snap lines on the top plate or ground for positioning.
It must be fixed firmly to prevent displacement.
Text: 01 super pipe laying construction technology i.
If the pipeline exceeds the following lengths, a junction box shall be installed, and its position shall be convenient for threading: 30m without bending; 20m with one bending; 15m with two bending; 8m with three bending; 15) in the cast-in-situ building (wall) on the board, the box and box shall be blocked, and the supporting iron shall be tied to the reinforcement.
The casing and the pipeline shall be filled.
When the pipeline passes through the outer wall of the basement building or the pool wall, a waterproof casing shall be made and strict waterproof measures shall be taken.
General 1.
It is strictly prohibited to open long holes in the box, and it is not allowed to use electricity and gas welding to open holes.
