Treatment of common problems in top drainage? Installation steps of top floor drain pipeline

First, the top floor is poorly drained.

If the top floor drain is not dredged for a long time, a large amount of water will gather when it rains and cannot be discharged. It's only a matter of time before such a top floor leaks.

The reason for poor drainage on the top floor may be the uneven roof. It is suggested to re-level, and the drainage slope of flat roof should be about 3. If the accumulated water is in the drainage ditch or beside the guardrail, a drain (pipe) can also be added.

Or maybe the drain pipe is blocked. Especially a terrace with plants on the roof. Fallen leaves are particularly easy to block sewers.

Second, the top floor drain pipe common problems and treatment

1. Does it matter if the drain pipe on the top floor is reduced?

Reducing the drain pipe on the top floor has an impact. After the reduction. The drainage effect is not very good, and the roof is easy to turn into a pond.

2. Can the sewer pipe on the top floor be dismantled?

This sewer pipe is not recommended to be dismantled. It is the outlet of the sewer of the whole building. If it is removed, the water seal of your house will fail because of negative pressure, and the outlet of the whole building will become your toilet or sewer. If it is sawed off, it will stink every day.

3. Can the sewer pipe on the top floor be moved?

Generally, the sewer pipe leading to the roof cannot be removed because it involves the drainage of the roof. If you decide to demolish, you must confirm with the engineer of the residential property center in advance whether it can be demolished and the additional measures taken after demolition.

Third, the top drain pipe installation engineering steps

1, material acceptance

The quality of building materials directly affects the construction quality and the hidden dangers caused by poor materials in the future. Before installation, the drainage pipe should be strictly inspected, and the inner and outer walls of the drainage pipe should be smooth and level, without bubbles, cracks, depressions, peeling, serious cold spots and obvious marks.

2, on-site disclosure

The installer should read the drawings carefully and confirm the location of facilities and equipment such as water heater, sink, basin and washing machine. , and find out whether the owner or designer has special requirements. If there are special requirements, the construction shall be carried out according to the instructions of the owner or the designer.

3, pipe cutting

In order to avoid unnecessary waste in the installation process, the installer should measure the length of the pipe needed for cutting. When cutting pipes, use special pipes for cutting, and adjust the bayonet of pipe shears to match the cutting pipe diameter. When rotating and cutting, the force should be uniform. When cutting the pipeline, the section should be perpendicular to the pipeline axis, and the whole section of the fracture after cutting should be burr-free.

4. Pipe connection

The drain pipe and pipe fittings are connected by hot melt, which is the most reliable, convenient to operate, good in air tightness and high in interface strength. Before connection, dust and foreign matter on pipes and accessories should be removed. Pipes and pipe fittings shall be connected by welding machine heating, and the hot melting depth and time of pipes and pipe fittings shall meet the requirements. Do not rotate during hot melt welding. When connecting threaded pipe fittings, the raw material belt should be wound to ensure sealing.

5, pipe fixation

In order to ensure that the drainage pipes will not vibrate due to water pressure in future use, all drainage pipes must be fixed with pipe clamps. Pipe clamps shall be set at corners, water meters and pipe terminals 100mm for pipes with the spacing of 400—500mm and the outer diameter below 25mm. For example, under special circumstances, the thickness of mortar landfill should be >; 100 mm.

6. Inhibition test

After the drainage pipe is installed, a pressure test should be conducted. After installation, all internal wire elbows need to be equipped with plugs or triangle valve to ensure sealing. Pressure test of drainage pipe is a test to ensure the quality of drainage pipe and installation quality. For the pressure test of the drainage pipe, pump the pressure ≥0.6Mpa into the pipe with a pressure pump (some manufacturers suggest that the pressure in the pipe is 0.8Mpa in order to reflect the quality of their own brand pipes. ), the pressure measuring time is not less than 30 minutes, and the pressure drops.

When installing the drain pipe, it should be horizontal and vertical, hot on the left and cold on the right, with a distance of 30 mm or more, and the distance between the hot and cold water outlet and the drain pipe should not be less than150 mm. Hot and cold drainage pipes should not be punched together, but should be punched separately. When the water supply and drainage pipelines are laid in parallel with the gas pipelines, the spacing should be ≥50mm, and the cross-laying spacing should be ≥10 mm. When the balcony needs to install a drainage pipe, a water valve should be installed.