The invisible manhole cover is a shape of stainless steel manhole cover . Some people call it a stainless steel sunken manhole cover . That is, most of the manhole cover products of stainless steel come in a square shape. And why is it called a manhole cover, which is also very particular about it. Chongqing Banan District Fengyi Stainless Steel Products Co., Ltd. will introduce you:
First, let's talk about the origin of the saying of the manhole cover: the manhole cover is also called the manhole cover. Let's look at the professional explanation first:
There will be many underground pipelines in urban construction, such as sewers, underground gas pipelines, water pipelines, power pipelines, communication pipelines, national defense pipelines, etc. These pipelines must have an exit to the ground every other section, from the pipeline to the ground It is called a manhole, and the manhole head is usually flush with the ground, so a cover is needed to cover the manhole cover, called a manhole cover. Manhole covers are usually made of reinforced cement, metal, reinforced plastic and other materials. The shapes are mainly round and square. On the manhole cover, it is generally necessary to indicate the purpose of the underground pipeline, the maintenance unit and the telephone number.
Because 窨 and Yin sound are the same and their meanings are similar, many people read the manhole cover as a manhole cover. The reason why it is called a manhole cover is related to the state where it is usually dark and invisible below the wellhead.
The reason why stainless steel manhole covers are mostly square is that stainless steel manhole covers are mainly located underground, such as square tiles, shopping malls, cafes and other places. Be consistent with the shape of the brick.