Ductile Iron Casting Factory: Construction Specification for Cast Iron Drainage Pipe Fittings
1、 Installation technical preparation
1. Familiarize oneself with the drawings of this profession and other related professions, and conduct technical, environmental, and safety disclosures.
2. The materials used have been recognized by relevant parties and have passed the inspection.
2、 Material requirements
1. The models and specifications of the pipes and fittings used must meet the requirements of the design and specifications, and should have a neat appearance without any damage
Damage, burrs, sand holes.
2. The production and installation of all suspension supports shall be strictly in accordance with the specifications; Supports and hangers shall be made of section steel, and bolt holes shall not be used
Electrical welding, drilling, expanding, or cutting.
3. Cast iron pipes, stainless steel clamps, channel steel, round steel, expansion bolts, flat head bolts, nuts, paint, etc. shall meet the use requirements.
3、 Main equipment
1. Equipment: impact drill, electric hammer, grinding wheel saw, electrical welding, etc.
2. Tools: special wrench, wrench, hammer, chisel, level ruler, steel coil
3. Cast iron pipe, stainless steel clamp, channel steel, round steel, expansion bolt, flat bolt, nut, paint, etc. shall meet the requirements of
Use requirements.
4、 Construction process
1. Technical requirements
1.1 The flexible interface drainage Cast iron pipe shall not be set in the floor, roof panel, pool wall, wall and other structural layers. The clear distance between pipeline interfaces and walls, beams, and slabs should not be less than 150m.
1.2. The inner and outer surfaces of flexible interface drainage cast iron straight pipes and fittings should be coated with anti-corrosion materials before leaving the factory, and the coating should be uniform and firmly bonded.
1.3. When laying underground, the distance between the top of the drainage pipeline and the indoor floor should not be less than 300mm and should not exceed 600mm
(Except for the pipe section at the exit location).
2. Installation requirements of Cast iron pipe with flexible interface for building drainage
2.1 During the construction phase of building civil engineering structures, installation personnel should cooperate to ensure that drainage pipes pass through walls
Reserved holes, embedded parts, and reserved sleeves for load-bearing structures such as floor slabs and concrete beams.
2.2 Flexible interface drainage cast iron straight pipes, fittings, and interface components with signs of damage shall not be used. right
Products stored for a long time should undergo visual inspection before use, and if any abnormalities are found, performance testing should be conducted.
2.3 When the flexible joint drainage Cast iron pipe pipeline system is installed, the signs on the outer wall of straight pipes and pipe fittings shall be set at obvious positions.
2.4 The allowable deviation of verticality for the installation of drainage vertical pipes should not exceed 3mm per unit pipe length (1m), and the total length should be (5m
The above should not exceed 15mm. The slope of the drainage horizontal pipe should meet the design requirements, and it is strictly prohibited to have no slope or reverse slope. There should be solid supports or piers at the bottom of various vertical pipes.
When 2.5 cast iron straight pipes need to be cut, the end face of the cut should be perpendicular to the axis of the straight pipe, and the cut should be polished smooth.
2.6 When the straight section of Cast iron pipe with flexible interface for building drainage needs to be installed with broken line locally, its interface
A slight deviation is allowed, but it must be connected axially (when the deflection angle is zero) before deflection. Each connection
The deflection angle of the clamp type of the mouth shall not exceed 3 °, and the flange socket type shall not exceed 5 °.
2.7 Two 45 ° elbows shall be used for the connection between the flexible interface Cast iron pipe drainage riser and the end of the drainage pipe,
And fixed measures such as piers or brackets shall be installed at the bottom of the riser.
2.8 Drainage pipes passing through the floor slab should have reserved holes, which are 2 sizes larger than the pipes. After the pipes are installed, they should be filled tightly
The sealing paste is tightly sealed. A water barrier should be installed around the riser that is 20mm higher than the floor surface and has a width greater than or equal to 30mm
Circle.
Installation of underground flange connection drainage system:
1. Centrifugal Cast iron pipe with flexible interface mechanism is used for installation, and the connection mode is flange connection, which is used for the buried part of the toilet.
Before entering the construction site, the materials must be carefully inspected. The materials must have a permit, certificate of conformity, and inspection report. The pipes must be cleaned before use to ensure smooth water flow inside and outside the pipes. After the pipes are installed, two coats of anti-corrosion paint must be applied.
2. The slope of the drainage pipeline is i=0.01. Before laying the pipeline, the trench should be compacted to prevent soil settlement. Before installing the pipeline, a 20cm thick sand layer should be laid, and after installation, a 20cm thick sand layer should be covered. During the pipeline installation process, brick piles must be added at the bottom to prevent the pipeline from sinking. The spacing between the brick piles is 1.5 meters, and the vertical pipe of the drainage pipeline must be made of concrete piles.
3. Pipeline installation; Install the socket of the pipeline in the direction of the incoming water, from the position of the discharge port to the direction of the incoming water, using the
Find the slope from the starting point of the drainage pipe to the end of the drainage outlet, and use cement mortar and bricks below each drainage pipe
Build a two or four brick pile as support, and after the pipeline installation, both sides of the pipeline should be fixed with mortar and plaster in eight shapes.
4. Connection and installation steps of flexible interface flange socket type Cast iron pipe:
4.1 Before installation, the dirt, sundries and interface parts on the inner and outer surfaces of Cast iron pipe straight pipes and pipe fittings shall be bonded
Clean the sediment and other attachments on the joint surface.
4.2. Insert the flange gland into the socket end, and then insert the rubber sealing ring (B-type interface rubber sealing ring)
Pay attention to its directionality.
4.3. Insert the socket end of the straight pipe or fitting into the socket and leave a 5mm gap between the socket end and the inner bottom of the socket
Install clearance. During the process of * *, it should be ensured that the axis of the * * pipe is in the same straight line as the axis of the socket pipe as much as possible
On.
4.4. Calibrate the position of straight pipes or fittings, so that the rubber sealing ring is evenly and tightly attached to the chamfer of the socket, and use a support (hanger) to preliminarily fix the pipeline.
Align the flange gland with the socket flange screw hole and tighten the connecting bolts. When tightening the bolts, attention should be paid to ensuring that the rubber sealing ring is evenly stressed. The three ear gland bolts should be tightened simultaneously at three angles, one by one; The four ear, six ear, and eight ear gland bolts should be gradually tightened in a diagonal direction.
4.6 Adjust and tighten the support (hanger) bolts to secure the pipeline.
5. Verify the coordinates of the pipeline according to the construction drawings, and conduct a water filling test after the slope/spout position is correct. The test height should not be lower than one layer of ground. After 15 minutes of water surface drop, fill it up and observe for 5 minutes. If the liquid level does not drop and there is no leakage at the interface, it is considered qualified.