Are underground pipelines on the first floor public facilities?

Although it is used independently on the first floor, the outdoor pipeline still belongs to public facilities. Unreasonable.

Underground pipelines are pipelines laid underground to transport liquids, gases or loose solids. In ancient China, underground drainage pipes made of clay were used. Beijing, the capital of the Ming Dynasty, used a lot of bricks and stones to build underground drainage pipes.

The width is about 1 m and the height is about 2m. There are many kinds of modern underground pipelines, such as round, oval, semi-oval, multi-round, heart-shaped, oval, rectangular (single-hole, double-hole, porous), horseshoe and so on. They are made of steel, cast iron, concrete, reinforced concrete, prestressed concrete, brick, stone, asbestos cement, clay, plastic, glass fiber reinforced plastic (reinforced plastic) and other materials.

Prestressed concrete pipe

Pipes with an internal diameter of 400 ~ 1400 mm can be used for pipes with working pressure of 0.4 ~ 1.2 MPa; When the working pressure is less than 0.4 MPa, the maximum pipe diameter can reach 4000 mm, and the socket interface and circular cross-section rubber ring are used to stop water. There are two kinds of pipe-making processes: core winding and vertical vibration extrusion. The concrete grade is not less than 400, and the prestressed steel bar is made of high-strength cold-drawn steel wire.