Concrete manholes can be constructed in several different ways. Some people use brick and stone masonry, while others use reinforced concrete. Brick masonry is typically more expensive than concrete and is not practical unless you have a lot of space. The bottom portion of a maintenance hole is usually semicircular or U-shaped.
The concrete channel has a diameter equal to the size of the sewer line. A maintenance hole crown is the top edge of the hole and is made to slope towards the channel. Concrete channels at the base of the maintenance hole provide a more uniform transition between sections, important for preventing blockages. Additionally, precast manholes are highly customizable, which means they can meet your specific requirements.
For example, they can be made to accommodate a custom opening, such as a bench or channel invert. But whether you choose to use brick or concrete, it is important to consult the specifications of each type before choosing a material.
One of the most important features of concrete manholes is their versatility. They’re commonly used at pipe junctions and vault openings to provide maintenance and inspection access to underground piping systems. These structures can be made from different materials and have different design components. Here’s an overview of different types of concrete manholes:
Plastic manholes are an environmentally friendly alternative to traditional concrete. These structures don’t harm groundwater and are less likely to require rehabilitation. They are also durable and environmentally friendly.
The materials used to manufacture plastic manholes are environmentally friendly and sustainable. The plastic material does not corrode and doesn’t contaminate groundwater. The manhole is made with additional accessories like weirs and flumes so that they can withstand the most severe weather conditions.
Depending on their size, shallow manholes are most commonly constructed at the start of a branch sewer line where heavy traffic doesn’t occur. They are shallow and usually between 75 and 90 cm deep.
The deepest type has a larger diameter than the shallow one. Traditionally, manholes were constructed by laying concrete in the field, but today they are often constructed on the site of construction. These types of manholes are often placed far from wheel lines.
Armorock concrete manholes are another popular option. They are made of unusual materials and can withstand heavy traffic. They’re durable and won’t rust as cast-iron ones do. The solid-top version is ideal for industrial settings and heavy-duty manufacturing workshops. A wide range of maintenance hole covers is available from maintenance hole exporters. They offer various sizes and strengths to meet the specific needs of their global customers.
Before applying the coating, you must thoroughly clean the maintenance hole’s interior walls and floor. The cleaning should be done carefully, as any foreign material could affect the coating’s performance and adhesion to the substrate. After the cleaning, the wall sealing compound should be applied. You should apply it to an even coating, and any loose material should be removed before it hardens.
Concrete manholes are vertically confined spaces underground used by utility personnel to access a sewer system. They provide access to underground pipes and drains and can be used for inspections, cleaning, and repairs. A manhole’s perforated cover allows foul gases to escape, making it a great way to ventilate a sewer system. It is also useful for connecting multiple sewers, allowing for convenient lengths.