Hose bridge
Hose bridges are mostly used by fire brigades and offer the possibility of laying hoses across streets or paths without having to block them, and ensuring that vehicles can still cross.
reason
Hose bridges must be used for hose lines over long distances or to a point of action on the other side of the street than the water extraction point so as not to bring traffic to a standstill and to avoid damage to the hoses.
species
Ground-level hose bridge
Simple hose bridges are made from beveled square timber screwed onto belts . The distances between the squared timbers are adapted to the hose diameter.
Other hose bridges consist of three aluminum components. The U-shaped middle part is placed over the laid hoses, a beveled component is inserted on each of the two outer edges, the lower edge of which is rubberized, which enables the hoses to be driven over cleanly. There are also hose bridges made of hard rubber, each consisting of one part.
Three hose bridges should be laid out for each direction of travel of the road in order to enable two track widths ( truck / car )
Hose bridge above the road
Pipe-hose transfers, in which the hoses should be above the roadway, consist of two parallel pipes with B-couplings and four vertical poles, similar to tent poles. This form is carried on hose trolleys. A pipe-hose transfer according to DIN 14 821 has the following dimensions:
Height overall: 4.20 m, headroom: 4.00 m, width (top): 3.30 m, width (bottom): 5.50 m
Couplings: 2 B-Storz (75 mm)
Such an overpass can also be temporarily assembled from four ladder sections. For this purpose, two step ladders have to be built and placed on both sides of the street so that the hose hangs over the street. The vehicles can thus pass under the hoses.
Alternatives
Sometimes, however, it is also possible to cross the streets through the existing sewer network (usually the rainwater sewer ) with the hoses. As a result, the flowing traffic, especially on busy roads, is much less hindered. Otherwise, it is often necessary to block the road, as otherwise the slow crossing of the hose bridges will still lead to severe traffic obstructions and the crew will be tied up for supervision.
With railway tracks underpasses are often already permanently installed for hoses. A hose can be connected here on either side, and in the middle is a rigid pipe. Alternatively, a hose can be passed between the sleepers under the track itself.
literature
- Lothar Schott, Manfred Ritter: Fire Brigade Basic Course FwDV 2 . 20th edition. Wenzel-Verlag, Marburg 2018, ISBN 978-3-88293-220-1 .
