What are internal drainage and external drainage?

1. Internal drainage and external drainage mainly refer to the area in the direction of drainage slope of building roof. Drainage leading to the outside of the building is called external drainage, and drainage leading to the inside of the building is called internal drainage (such as open-air patio). The internal drainage system needs to discharge water from the building in an organized way.

2. The internal drainage system is often used in multi-span industrial workshops, as well as workshops with shell roofs, serrated roofs and skylights where it is difficult to set gutters. High-rise buildings with high building facade requirements, large roof buildings and buildings in cold areas are not allowed to set rainwater risers on the external walls, and internal drainage should also be considered.

3. External drainage system The external drainage system of the gutter consists of the gutter, the rain bucket and the drainage riser. The gutter is arranged between the two spans, and the slope ends are covered with moisture. Rain buckets are arranged along the outer wall. Rainwater falling on the roof is collected in the gutter along the grave to the roof of the gutter, flows to both ends of the building along the gutter, enters the gutter, and is discharged to the ground or the rainwater well through the riser. The drainage system outside the gutter is suitable for multi-span industries with the length not exceeding 100m.

Extended data:

Drainage mode:

1, inspection well

Shajing drainage canal is connected with other pipes and canals, and maintenance workers check and clean up where to enter the customs to obtain structures.

Step 2 dance well

Inspection wells with large bottom jump difference between the upstream and downstream pipelines of the manhole are used to deal with emergencies when the water flow is large.

3. Accident discharge port

Emergency sewage outlet is a facility that temporarily discharges wastewater to natural water bodies or other places when the drainage system fails.

4. Storm overflow well

A structure used to intercept and control the combined water flow in a combined drainage system. Tidal gate is a one-way opening and closing valve set at the outlet of the drainage pipe to prevent the tide from flowing backwards.