HDPE pipes
Fittings
Manholes
Special Fittings
Joints & Connections
 
 
 
Home Products Manholes
Manholes

To have the possibility to control and maintain pipe systems regularly, manholes are integrated in the system. These are mainly installed at the positions of bends, reduction or branches. The manholes are made of the same material as the pipes and are also connected to the system with similar jointing techniques. The special advantage is that a homogenous system of the same material is produced. With preference, profile types like SQ and VW are used for the production of the manholes, as the soil can densify better at the smooth outside of the pipe and can settle without problems.

Standard manhole
This kind of manhole is situated centrically above the pipe. Because of static and safety reasons this type is only recommended if the diameter of the pipe is smaller or equal to the diameter of the manhole. Normally the diameters DN/ID 800 mm of DN/ID 1000 mm are used for this kind of manhole.

 



Usually the lower part of the manhole is completely fabricated out of polyethylene or polypropylene according to the static requirements. The upper part is a concrete or reinforced concrete ring according to DIN 4034. Even very complex constructions according to the engineers requirements are possible. The main advantage is the sustainable, flexible, light weight, inspection friendly, self-cleaning and durable construction.

Tangential manhole
This manhole is situated tangentially to the pipe, that means it is displaced from the middle.


That is the reason why by using this kind of manholes with the standard diameter of DN/ID 1000 it can be also used for pipes with bigger diameters.

Like the standard manhole, the lower part of the manhole is completely fabricated out of polyethylene or polypropylene according to the statical requirements. The upper part is a concrete or reinforced concrete ring according to DIN 4034. Even very complex constructions according to the engineers requirements are possible. The main advantage of the tangential manhole is the sustainable, flexible, light weight, inspection friendly, self-cleaning, durable and a very cost effective construction.

Special manhole
If required a manhole made of concrete can be produced with an inlet and outlet designed to connect to the Krah pipe system. For the cover of the manholes there exist all different kinds of possibilities. Especially the application case and the loads are a major criteria for the correct choice of the cover.

Regularly the manholes are installed in such a way that the top edge is justified to the earth´s surface or the street. In this case the cover has to be designed in a way that the direct load conditions, e.g. crossing vehicles, can be carried and forwarded. The most frequently used system is the concrete plate above the manhole which lies on a ring anchor.

The advantage is that the rising loads are not forwarded to the manhole but through the ring anchor to the surrounding earth.

These covers are especially suitable for the installation in roads, as the cover is integrated into the asphalt and flexibly connected with the manhole (telescopic). Thus the cover moves with the asphalt in case that the road settles and the manhole is always even.

 
www.ugpm.net
www.krah.net
www.krah-pipes.ee
www.kpps.net
www.polypipe.com
Forgot your Password ?
KRAH BAHRAIN Co. W.L.L,
P.O.Box 32671 Isa Town, Kingdom of Bahrain
+973 17 879 400
+973 17 917 779
info@krahbahrain.net