Suitcase (traffic route construction)
As a case is referred to the transportation infrastructure in general an unbound supporting layer overlying the subgrade (also suitcases sole known), and as a support for the pavement or the track is used. The base course is usually a capillary-breaking rock layer made of non-cohesive aggregate (such as gravel or crushed stone ). The layer thickness of the rock layer depends on the frost penetration depth and the traffic loads that occur.
development
The term "suitcase" came about when trying to create roads and paths in swampy terrain . So-called suitcases had to be embedded in the moving subsurface in order to maintain permanent and viable traffic routes there. These suitcases consisted of a bed of stones built into the bushes. A similar construction technique was also used in hydraulic engineering . There, wicker baskets filled with stones (also called sinkers ) were used. a. as bank protection.
In the course of time, this term was also used for the lower fastening layer ( packing layer ) of earlier roads, although no suitcase was actually built in anymore.
The term "suitcase" is now to be regarded as out of date, as it is no longer listed in the current guidelines and regulations for road and track construction. In everyday language, however, the term has been retained and still appears there as a combination of words (for example in gravel suitcase or road suitcase ).
See also
Individual evidence
- ^ Society for the German language: Mother tongue , issue 5, born in 1952, Heliand-Verlag Lüneburg, page 312.
- ^ Lueger, Otto: Lexicon of the entire technology and its auxiliary sciences, Vol. 8 Stuttgart, Leipzig 1910., p. 82 .