I. PURPOSE

- Instructions for repairing electricity and water at home:

• Principles of arrangement of pipes and upland fields with drainage covers from inside the project to public sewers or wastewater treatment locations.
• Principles of arrangement of manholes, visit pits, sewage pits, pits diverting wastewater flow.
• Principles of arrangement of drainage pipes from septic tanks to public pits or to permeable wells.

- Understand and know the materials for making pipes and constructing drainage ditches when drinking yogurt

II. RANGE

- Rainwater drainage system.

- Waste water drainage system for:

• Row houses
• Villa
• Apartment building
• Isolated apartment complexes on common grounds
• Factory
• General factory cluster

III. RESPONSIBILITY

- The Site Steering Committee must instruct the workers, including the subcontractors, to comply with this Work Guide when executing the construction of underground structures and construction of sewer pipes.

IV. TUTORIAL

 A. GENERAL

1. If the terrain conditions and budget allow, separate drainage and sewerage systems should be separated.

2. At each end of the pipe, the inlet of a sewage pipe should have a strong odor-blocking seal.

3. The layout of the pipeline surface must comply with the regulation on curvature and bend radius for the gravity flow. If you need to turn 900, use a manhole.

4. Pipeline slope must comply with the code.

5. The inner surface of a pipe must comply with the smoothness prescribed, either for the type of thread made of a material, such as terracotta pipe, uPVC pipe or for the tube with side smooth lining. in, such as cast iron pipes lining the mind.

6. It is only acceptable to conduct treated sewage according to the code into the public sewer system.

7. A manhole must be installed to check the code properly.

8. The construction of manholes, visit pits, sewage pits, pits diverting wastewater flow must strictly comply with regulations.

9. After designing and installing the waste water drainage system, including the components mentioned in Clause IV.A.8 above, the home electrician must repair the test according to the regulations and make a written report. The superior authority has the right to approve before putting it into use.

B. GENERAL TECHNICAL REQUIREMENTS

1. Rainwater drainage pipe:

2. It is necessary to have a garbage stop at the position of the down pipe and pipe or gutter.

3. If rain water is allowed to drain into a drainage ditch or sewer, the mouth of the manhole must have a stinking seal.

4. Water drainage network:

5. Siphons and discharge pipes from kitchen and sanitary equipment are connected to the main pipe horizontally.

6. Vertical tubes, receiving waste water from horizontal pipes.

7. Ventilation pipes for exhausting air in tubes must be raised high on the roof, one height above the roof.

8. Large pipes under the ground floor floor to receive waste water from vertical pipes.

9. Big ducts to collect waste water from inside the house.

10. Manholes in the ground floor of the house to check for large pipes under the ground floor floor according to the regulations. These manholes need to have a stinking sealant on them.

11. If required to use the position of discharging water into the drain on the floor, there should be a funnel collecting floor water to prevent stinking cement.

12. Drainage pipes outside the house, leading to the public sewer system, should have manholes or manholes with stinking sludge.

13. Drain pipe system for a cluster, the house should have manholes in position connected to the main drainage pipe of the campus.

14.when using the drainage ditch instead of the underground pipe or sewer, the inside of the ditch must be smooth, the ditch with reinforced concrete cover or cast iron, galvanized steel, with rainwater receiving holes if there is no ditch rainwater separately

C. UNDERGROUND AUXILIARY ACCESSORIES

1. Manhole:

- Serving a straight ditch or straight gate outside the house: If it is a long section, according to the distance prescribed by the code, there should be manholes for checking.

- Service of changing direction 900.

- The inside of the manhole must be smooth, with reinforced concrete lid or cast iron or galvanized steel.

2. Sewage pit: A temporary underground storage tank, receiving sewage and rainwater if there is no separate system in a campus with many houses, with submersible pumps or other means to pump waste water to its origin. physical. Must execute proper drawings and technical rules.

3. Flow diversion pit:

A. In a large campus of

- Indoor water supply network: Including main pipes, vertical pipes, branch pipes leading to domestic water devices.

- Request with indoor water supply pipe is:

• Water supply pipelines must be reasonable and have the smallest length to save material costs, reduce the volume of excavated soil, fill up and reduce pressure losses.
• It is easy to attach pipes firmly to house structures: walls, ceilings, beams, rafters, ... with pipe support parts such as hooks, horse necks, hanging rings, brackets, etc.
• Convenient, easy for checking, repairing pipes, opening and closing valves, ... Usually people put open pipes, to ensure the beauty can paint the pipe color like the wall color. If there are many different pipes, use different paint colors to distinguish them, such as blue cold water supply pipes, red hot water supply, black drainage, silver steam, yellow chemicals, ...

- For special constructions: high aesthetic requirements, pipelines may be closed, pipelines are installed in grooves in the floor, under corridors (if it is main pipes) or in gaps between two walls. walls (vertical pipes, branch pipes).

- When closed, the lid or door must be opened at important places (where the valve is installed, etc.) to facilitate inspection and repair.

• Branches supply water to sanitary facilities, usually sloping 0.002 - 0.005 to easily drain water in pipes when necessary. Vertical pipes should be placed in corners. Each branch pipe should not supply water to more than 5 units and must not exceed 5 m in length.
• When passing through a wall, the foundation of a building must pass through a hole or a metal conduit with a diameter of 200 mm or more in diameter, in case the house is pulled down under the pipe, making bucket deflection of broken pipe or broken joints. The gap between the hole and the tube must be filled with elastic material: bituminous fibers, clay, etc.

 B. How to connect pipe

- To connect steel pipes together, it is used to weld or thread.

- Using welding method: to ensure tight, durable but consuming electricity, welding rods and require high welding quality, so this method is often used for large diameter black steel pipes.

- Threaded connection method is the main method to connect water pipes inside the house, use ready-made fittings with internal threads and then install them to threaded pipes outside the pipe, before screwing in. each thread must be wrapped around the thread outside the pipe to tighten and seal the junction and apply a rust-proof paint on the thread (because when the zinc thread is peeled off). Pipe threads can be either straight (most common) or oblique serrated to ensure greater stability, used under pressure. Internal threaded fittings with a diameter of 100 mm or less are usually made of cast iron when the water pressure is less than 10 atm and steel when the water pressure is greater.

• Cast iron pipe is usually made of one flared end, one smooth end to connect a pipe.
• Plastic pipe connected by threaded, welded, plastic, flanged plans.

D. TOOLS AND FOLDINGS

1. Delegation map grab sign, ruler drag.

2. Groove cutting machine, hammer, chisel.

3. Tube cutters, cleaning supplies, glue (or welded fittings), for plastic pipes.

4. Pipe-clamps, tooth vein, tooth scissors, clamps, etc. V ... (along with steel pipe, galvanized iron).