TUTORIALS

Manhole – Purpose, Types, Features and Construction

An inspection chamber or a manhole is basically an entity built below the ground to offer entrance toward the utilities such as a drainage system, sewer system, and so forth. For this reason, through the medium of a manhole, subsurface utilities are checked, transformed, wiped as well as preserved.

The major objective, aspects, as well as sorts of a manhole are concisely described in the piece of writing.

Objective of Manhole: The major objective of a manhole is–

• In order to carry out assessment, washing, as well as exclusion of an obstacle there in the sewage system/sewage line.
• Furthermore, the connection of sewers, the alteration of route or the arrangement of sewers can be carried out through the medium of manhole.
• Those possess a pierced cover which assists the foul gases to get away. For this reason, it is a fine way of aeration/ventilation with regard to the subsurface sewerage system.
• Also, manholes assist to set the sewer line in the usual lengths.

Aspects of Manhole: The major components of a manhole are the ring or chamber as well as the upright circular pipe. Furthermore, the vertical circular pipe is present in differing depth as well as sizes. Those pipes are utilized to reach the assessment/inspection junctures/joints in the arrangement.

Manholes are generally placed 0.5 m apart from the road’s curb lines. Mainly, it is built in such a way that it is apart from the traffic’s wheel line.

Moreover, a manhole’s cover is basically a plug that safeguards the manhole from a not permitted access. Furthermore, the covers utilized with regard to manholes could be square, circular, or rectangular in form.

The cover’s material could be composite material, precast concrete, or a glass reinforced plastic material.

Furthermore, the prerequisite for entry via the manhole is carried out by means of steps. In case the manhole’s depth is not more than one m, a step ladder is built. In case the manhole’s depth is more than 2.5 m, a standard ladder is set. Currently, contemporary manholes don’t require physical access.

Sorts of Manhole: The 3 major sorts of manhole on the basis of the depth are –

Shallow Manhole: A shallow manhole possesses a depth varying amid 75 to 90 cm. Those are built in the beginning of a branch sewer or in a region wherein there is not significant traffic.

Furthermore, the shallow manhole is offered with a light cover known as the inspection chamber.

Normal Manhole: Those are offered at the sewer line with a weighty cover at its top. Moreover, it possesses a depth of 150 cm. Furthermore, standard manhole gets a square form.

Deep Manhole: Deep manhole is offered at a depth more than 150 cm having a quite weighty cover on its top. Moreover, the size could be raised as well as the feature for getting down is even enhanced.