Manholes and handholes have the function of granting access to a confined space. The only difference between manholes and handholes is the size of the opening: an adult fits through a manhole, whereas only a hand or an arm fits through a handhole. Manholes and handholes are composite items which consist of a manhole ring, a manhole cover, a rubber gasket, bolts and possibly a coaming welded to the manhole ring (depending on the type).More information
Manholes and handholes come in many shapes and sizes:
The oval manholes are often used. They come in the following types:
The stainless-steel and aluminium manholes are fitted with stainless-steel bolts as standard.
Steel manholes are standard delivered without bolts. Galvanised or stainless-steel bolts can be ordered separately.
Aluminium manhole rings are supplied with stainless-steel thread inserts as standard.
The quality of the materials used is as follows:
The pictures below give an impression of the working of manholes with one central bolt:
Some components are also available separately.
See the article group ‘Rubber seals’ for the rubber gaskets used for manholes.
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