Storm drain

A road gully, also inlet grids, (colloquial and technical language outdated even Gully, Swiss Dole ) is a component of road drainage. It is used to hold surface water on paved areas and, this underground drainage systems (such as the sewer ) to.

Distinction between

The Road drainage has a number of terms, which can also vary by region. In addition to the technical terminology outdated naming Gulli or Gully also the name of rainwater inlet, Sink or caisson is needed. In Switzerland, the terms Dole or oils are used. Less commonly, the term floor drain or used because of its appearance channel grid.

The term Gully is colloquially mostly as a collective term for road gully and manhole covers (also called manhole cover ) are used. The word gully (plural: the gullies ) originates from the English ( gully, spr Gölli, " enema .")

Construction

A manhole consists of a common grid-shaped upper part, the manhole cover or Senkkastendeckel (not to be confused with the manhole covers ) made ​​of cast iron, which is also used in a cast iron frame. Cover and frame are referred to in road construction as an attachment. These components are available in different sizes and shapes ( troughs, shed, gutters and special types). Furthermore, there are these essays in different load classes, depending on the requirements of the adjacent paved area. Requirements of these essays are in EN 124 regulated (formerly DIN 1229 in Germany ).

Below the tower is the downcomer, which can be constructed from precast concrete. The concrete shaft consists of a support ring for the cast iron frame, a shaft and a bottom piece with a pipe connection to the sewer or (more rarely) to rainwater infiltration. Optionally, a rough dirt use (sludge trap bucket ) made ​​of galvanized sheet steel and precast concrete will be installed as a trap. Alternatively, the rainwater inlet be designed so that the shaft 30 to 120 centimeters lower than the level of the pipe connection. This shaft then takes over as the strainer, the task of the sludge trap bucket. There are also street drain body, which are made entirely (excluding essay ) of plastic, which has facilitated relocation of the.

The point-like drainage of surface stands in contrast to linear drainage using drainage channels.

Cleaning

The sludge trap bucket must be cleaned at regular intervals from the accumulating debris in it. This is a physically tough work, because the Senkkastendeckel raised by muscle power and the sludge trap bucket, which can be very difficult depending on the size and filling also has to be tilted by hand on the back of a truck or in the bucket of a loader. Meanwhile, there are various attachments for Unimog, Multicar or Bokimobile, in which the Senkkastendeckel lifted using a hydraulic cylinder and swung to the side. A hook on a steel cable is also lowered hydraulically and hooked into the sludge trap bucket. The sludge collection container is pulled upward and emptied above the loading space of the vehicle.

In the alternative construction without sludge trap bucket, the shafts with a vacuum truck are (in Hamburg called " strand sucker " ) cleaned. This is a truck that is equipped with holding tank, pump system and with an arm for suction hose and pipe. To clean the rust is lifted. Thereafter, dirt, sand and standing water from the well to be sucked into the collection tank and then closed the grate again.

Norms and Standards

• Guidelines for the construction of roads - Drainage (RAS - Ew)
• DIN 4052 - Concrete elements and buckets for road gullies