Type of manhole sewage
Sewage Manhole ! Every time we talk about the manhole, everyone thinks about the sewage, because first and greatest application of manholes is in sewage system, but use of manholes is not only in sewage system, and in all underground channels that we want to access, Manhole is mandatory.
When we talk about sewage system and its associated systems and sewage network equipment, we have to think quickly about its durability and its longevity, and its resistance to sewage, and next issue is the type of sewage, and suspended solids in sewage must be specified. Urban sewage and household sewage only have corrosive material and gas, however, industrial sewage and agricultural sewage have different characteristics and conditions, and some of these material, are toxic and very dangerous, that they should not be exit from sewage disposal or disposal system at all. Of course, this applies to all kinds of sewage, but somewhat more sensitive to industrial wastewater and agricultural waste.
Type of manhole sewage can be different relative to the type of sewage. In fact, kind of sewage can forces us to choose of manhole type, and limit our choices.
Brick and cement manhole
Brick and cement manholes have been used and made for a long time, and still exist at the cities and communities. These types of manholes have many problems, for example, they must be built at the project site, and build them takes a few days, different materials are needed to make a manhole. These manholes are not completely sealed. Over time, they have severe corrosion and decay, these manholes require periodic maintenance and care, and have many other problems, and these traditional manholes are not used these days.
Concrete manholes are executed in two ways. In some types of concrete manholes, reinforced manhole location, and, concreting is done in situ, so this method requires a lot of equipment. This method also requires a lot of human resources, all of these factors increase cost of project implementation, and time of project implementation is very long, and until the concrete has dried completely, Trench should be open, which is very dangerous. There is another way for implementation of concrete manholes, and in this method are used from prefabricated concrete parts, which are made and produced at another location, and transported by special machines to the project site. In this way, time of project implementation and manufacture of manhole is reduced, but there is need for heavy machinery and manpower and manhole is not completely sealed. Generally, sewage system causes severe erosion of concrete in over time, and destroys the manhole. During certain periods, manholes must be serviced, and need to maintain them, and of course, If is needed to repair and open manhole, this work will be very difficult and costly.
Manholes, or same GRP manhole, may be suitable at first glance, but according to fragility of the GRP (fiberglass), it cannot be trusted over time, and they fatigue in the course of bearing of dead and alive loads over time, and break down, and of course their biggest disadvantage is that, you must have exact size already, until GRP manhole will be manufactured according to your size, and then transferred to project site, and their other problem is their relatively high weight, which will require a crane to carry them, But it should be said that these manholes can be suitable for areas with high surface waters, and have good sealing. It is suggested that these manholes can be used as handholds and valves and electric cubicles, also, these manholes are fragile and should be careful when carrying them.
Polyethylene manhole can be considered as the best type of manholes, it has very low weight, and two people can carry a manhole with a height of 4 meters and a diameter of 1 meter. Polyethylene has excellent resistance to acidic and alkali materials and sewage sludge, in a way that over time, sewage does not have any effect on polyethylene manhole. Low price of polyethylene manholes compared to composite manholes and traditional manholes (see the price list), Suitable external resistance to dead and live traffic loads (standard manholes), very fast execute of polyethylene manhole, allows you to open the trench in less than one day, then place manhole and close the trench. Complete sealing of this manhole is another properties of prefabricated manhole, which does not allow wastewater to enter the environment, and it keeps the sewage in transmission network.
Production of Polyethylene Manhole in two monolithic and modular manholes methods (polyethylene manhole parts). Monolithic manhole is suitable for some applications and places where surface water is high, and height and size can easily be increased
Production of polyethylene manhole is rotary method, and this production method allows manufacturer to design their mold in best possible way, and there are good innovations in this area. For example, the creation of a robust and integrated step with a manhole is one of the things that makes manhole durable, safe and sealable.
One of their drawbacks is in areas with high surface waters, and the manhole is not properly installed, which is fixed by installing of pre-fabricated concrete belts. These manholes have no other objection, and if you know something else, report us, so we solve it.