Concrete manhole with base: the base is precasted together with manhole body, reduced the lifting work during installation, but not very convenient to install.
Joints of Concrete Manhole
Joints between the manhole elements are almost the same with concrete pipes, there are flat joints, as well as male & female joints. The seals for the gap are cement plaster, factice, and rubber seal.
Concrete Manhole Manufacturing
There are ways to manufacturing concrete manhole, by dry cast vibration machine and wet cast manual mold. are the most common two methods.
Wet Cast Manhole Mold
Wet cast manhole mold uses the steel mold to manufacturing precast manholes, using wet concrete as aggregate, the finished manhole will cure inside the mold until it becomes solid to remove the mold. This mold is suitable for Low-Rate Initial Production.
Automatic Concrete Manhole Machine
Concrete manhole machine uses dry concrete as aggregate, and with the high-frequency vibration force, the finished manhole product has high density and strength, the mold could be removed instantly after production. This machine is suitable for mass production.