How much do you know about drainage manhole covers?

How much do you know about drainage manhole covers?

There are many types of manhole covers, usually communication manhole covers, power manhole covers, rainwater grates, public security manhole covers, ownerless manhole covers, sewage manhole covers, rainwater manhole covers, water supply manhole covers, street lights (light manhole covers), TV manhole covers, gas manhole covers, and network manhole covers. Among them, drainage manhole covers generally refer to pipe manhole covers marked with words such as sewage and rainwater, and rainwater sewer outlets are special facilities for covering and draining, generally on both sides of the road and on the internal pavement of the community. Manhole covers are the main supporting products for inspection wells. They can withstand high-speed traffic of large traffic flows, and can also prevent the entry of vehicles, pedestrians and foreign objects, ensuring the normal operation of underground pipelines and equipment. How much do you know about drainage manhole covers?

Classification of manhole covers

1 According to shape

It can be divided into round and square.

2 According to pressure bearing

It can be divided into light, ordinary, heavy and super heavy.

3 According to the material

It can be divided into:

1. Metal manhole cover: cast iron, ductile iron, bronze manhole cover, etc.;

2. High-strength steel fiber cement concrete manhole cover (cement-based composite material);

3. Recycled resin manhole cover (recycled resin-based composite material);

4. Polymer-based composite manhole cover, etc.

What are the main drainage manhole covers?

1 Sewage manhole cover

Identification method: The sewage manhole cover is connected to the sewage pipe and is used to discharge sewage. It is generally a large circle with words such as "dirty" and "sewage" written on it. The hidden dangers of inspection well facilities include: the inspection well cover is damaged, missing, sunken, and the road surface around the well seat is damaged.

2 Rainwater manhole cover

Identification method: The rainwater manhole cover is connected to the rainwater pipe and is used to discharge rainwater. It is generally a large circle with words such as "rain" and "rainwater" written on it. The hidden dangers of inspection well facilities include: the inspection well cover is damaged, missing, sunken, and the road surface around the well seat is damaged.

3 Rainwater grates

Common rainwater grates include single-grate rainwater grates (one alone), double-grate rainwater grates (two connected together) and multi-grate rainwater grates (three or more connected together). Common hidden dangers of rainwater grates include: rainwater grates are blocked, damaged, missing, displaced, sunken, and damaged pavement around the base.

4 Drainage ditch

Drainage ditch is usually composed of multiple cement prefabricated drainage covers, and the length, width, thickness and size of the covers are different, and there is no fixed specification. Common hidden dangers of drainage ditch include: ditch cover is damaged, missing, displaced, sunken, and damaged pavement around the base.

5 Grille well

Grille well is composed of multiple stainless steel grilles, and the length, width, thickness and size of the grilles are different, and there is no fixed specification. Common hidden dangers of grille wells include: grille well cover is damaged, missing, displaced, sunken, and damaged pavement around the base.

Why are most drainage manhole covers round?

1 Uniform force, not easy to break and tilt

The manhole covers on the road are often crushed by vehicles. After the manhole covers are stressed, they will spread pressure to the surroundings. If the pressure is unevenly spread, they are easy to break and collapse, leading to safety accidents. The diameter of the circle is constant, and the pressure spread to the surroundings is relatively uniform compared to other shapes. At the same time, the determined diameter can ensure that the manhole cover is not easy to tilt. Therefore, from the perspective of safety and durability, round manhole covers are more suitable.

2 Save material costs

The area of the inscribed circle of the rectangle is small, and the material cost of the round manhole cover is also lower in terms of saving material costs. The manhole cover is designed with wear-resistant and pressure-resistant materials, which can withstand high temperatures and cold. Now the design of the manhole cover is more environmentally friendly and beautiful, and fully achieves energy-saving and other utilities.

3 Convenient transportation and construction

The standard urban drainage manhole cover weighs dozens of kilograms, and at least several adult men are required to carry it at the same time. The round manhole cover can be rolled, which is convenient for transportation. There is no need to deliberately check the position during installation, so it will be more convenient for workers to operate. At the same time, the round manhole cover has no sharp corners, which is not easy to cause injuries during repair or installation.

4 Better withstand the pressure of the surrounding land

The reason why the sewer inspection well is made into a round shape is also because the arched structure can effectively resist the pressure of the surrounding land, allowing the inspection well to better withstand the load from uncertain directions.

5 The cross section of a person is basically round

In order to facilitate inspection and construction, the entrance and exit of the sewer should leave enough space for one person to pass through. The cross section of the staff climbing down the ladder is basically round, so the circle naturally becomes the shape of the sewer entrance and exit, and the round manhole cover is just to better fit the round hole.