Manhole

An inspection chamber ( manhole also, Eisteg or inspection chamber ) is a manhole structure which is used for checking, maintenance and cleaning of pipelines. These manholes interrupt piping systems for soil, mixing or rain water and are part of the municipal sanitation. But they are also traverse point the change in direction of a line, the bend gon (90 °) is at most 100. A shaft and the following in the direction of flow pipe is called attitude. They have the same name by ISYBAU. Inspection chambers are usually made ​​of precast concrete, masonry, fiber cement, polymer concrete or plastic. The combination of different materials is possible.

Components

Inspection chambers consist of various components:

  • Manhole cover
  • Bearing ring
  • Manhole (including cone) A cone is a shaft ring (generally the top manhole ) for tapering of the control shaft to the top. The tapering is asymmetrical, one side is perpendicular to this page crampons are embedded. In general, the cone has a height of 60 cm, the upper diameter of 625 mm or 800 mm.
  • Optional Components Cover plate ( thickness 200 mm) alternative to the cone at low shaft heights or unfavorable distribution of the components.
  • Transition plate (greater than 1200 at shafts, and more than two meters above the channel bottom, typically 1000 mm)
  • Bearing ring, foot ring
  • Manhole rings with crampons (according to DIN 1212 ) or other entry aids such as a ladder or stirrup
  • Nominal diameter of the manhole part DN 1000 to pipe DN 600 ( circular profile )
  • To pipe DN 800 ( circular profile )
  • To pipeline DN 1000 ( circular profile )

In addition to the round accessible sewer manholes, there are also hand shafts, but these usually have a square shape.

The shaft internal diameter with precast manholes depends on the pipe diameter, the profiles, the number and Einbindewinkel the connected channel profiles.

Shafts (rather manhole covers ) are distinguished according to load classes, such as class D and class F 400 900

Inspection chambers can also be composed of different nominal diameters using transition plates. Furthermore, it is also possible to combine different materials and shapes, for example, a square brick manhole base with a further build-up of manhole rings and cone of concrete.

Standardize

  • EN 124 ( formerly DIN 1229 ) - tops and manhole tops for traffic areas
  • DIN 4034 - Precast concrete products
  • DIN 4051 - Channel clinker
  • DIN 1211 and DIN 1212 - Crampons
  • DIN 28124 Manhole closures for pressure vessels made ​​of unalloyed steels

Structure in a channel network

  • Gon change in direction of a maximum of 100
  • Angle specification of feeds relative to the flow gon with 0, then clockwise following the feeds.
Wastewater Gradian Berm
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