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manhole covers / manhole covers

manhole covers
manhole covers

The drainage holes of this manhole cover use a kind of special sealing materials. Usually, this kind of material is in a sealed and hard shape. Material will be bent to soften when water flows. The drainage holes open and let the water flowing rapidly into the sewers.
Sewer odors often smelled.The covers is used for this situation., Usually, the drainage holes of this manhole cover in a hard and sealed shape, preventing sewer odor to coming out and preventing objects embedding or falling into the sewer and causing blockages. When with water the special sealing material soften and bend down. The sealing manhole covers are opened

University

South China Agricultural University

South China Agricultural University
Guangzhou, China

Design

South China Agricultural University

South China Agricultural University
GuangZhou, China

Linghui Zhu,Xuexing Wu,Peizheng Zhu,Zhiqiang Wang