The present invention relates to a prefabricated element assembly, for making barrier arrangements to be used in water courses and specifically in rivers.
As is known (e.g. from GB 2025494), along the torrential path of a water course, in particular if the latter extends on a water bed which can be easily eroded, there are conventionally provided suitable fabricated elements.
These fabricated elements are built through the overall bed of torrents under "excavation conditions", that is under those conditions in which, during water spates, the solid materials forming the bed are quickly removed.
These fabricated elements substantially operate to reduce the water stream flow rate or speed, and, accordingly, to reduce the eroding power of the water stream itself.
Also known is that conventional fabricated elements used for the above indicated applications comprise a plurality of cross barrier elements, which are conventionally called "weirs".
Each weir, by reducing the speed of the upstream water, favours a deposit of the transported solid material, which accumulates behind the weirs.
These weirs, in actual practice, transform the altimetrical profile of the water bed into a plurality of subsequent steps and portions of small slope.
In this connection it should be pointed out that these conventional weirs are usually made of a stone material walling, the stones of which are restrained by mortar or by dry restraining methods, or by using cement concrete (either reinforced or not) or mixed constructions of wood and stones.
Accordingly, the installation of the mentioned weirs is comparatively complex, mainly with respect to the making of the hollow provided in the profile of the top margin or "crest" thereof.
The thus made fabricated elements, moreover, are not adapted to provide a suitable mechanical strength, mainly against great stresses.
Accordingly, the aim of the present invention is to overcome the above mentioned drawbacks, by providing a prefabricated element assembly which allows to greatly simplify the making method of the mentioned weirs as conventionally used in water course beds.
Within the scope of the above mentioned aim, a main object of the present invention is to provide a prefabricated element assembly, for making barriers for application in water courses, in particular in rivers, which provides fabricated elements which are very reliable construction-wise.
Another object of the present invention is to provide a prefabricated element assembly, for making barriers for application in water courses, which can be used in a very flexible way.
According to one aspect of the present invention, the above mentioned aim and objects, as well as yet other objects, which will become more apparent hereinafter, are achieved by a prefabricated element assembly, for making barriers to be used in river beds and the like, characterized in that said element assembly comprises a plurality of box caissons each having a substantially parallelepipedal shape, of box-caissons having a rectangular trapezium profile, of square plates and of rectangular plates including a projection along one of the longer sides thereof, the mentioned box caissons and the rectangular plates being adapted to be joined to one another and superimposed onto one another forming the weir, the mentioned square plates being adapted to be joined to one another forming the sill, and the elements being furthermore adapted to be mutually restrained by beams, rods or other mechanical restraining elements.
Further characteristics and advantages of the prefabricated element assembly according to the present invention, will become more apparent from the following detailed disclosure of a preferred, though not exclusive, embodiment thereof, which is illustrated, by way of an indicative but not limitative example, in the figures of the accompanying drawings, where:
With reference to the figures of the accompanying drawings, the prefabricated element assembly for making barriers to be applied in river beds according to the present invention, comprises a box caisson 1 including a reinforced concrete box like construction, having a substantially parallelepipedal shape.
More specifically, this box caisson has unit height and depth and a double width, and is provided on its small walls with a plurality of gaps 2.
With the above mentioned first box caisson, a second box caisson 3 cooperates, which has a unit size and is open through one of its walls, there being moreover provided a third cooperating box caisson 4 closed through its four walls and having a suitably greater depth.
The subject prefabricated element assembly further comprises another box-like construction 5, also having unit depth and height and a double width.
This box-like construction, in particular, is open on one of the small sides thereof, where the two longitudinal walls 5′ thereof are suitably slanted.
With the above mentioned box-like constructions or box caissons, cooperate moreover a square plate 6 and a rectangular plate 7, or cover plate, which is provided with a projection 7′ on one of its larger walls.
In this connection it should be pointed out that the square plate is provided, on two opposite sides thereof, with annular ridges 8, which are adapted to house anchoring rods 9.
The rectangular plate 7, in turn, is provided, at the edge portion thereof, with a plurality of throughgoing holes 10 which are adapted to house a respective end portion of cross-restraining rods.
In operation, by arranging the above mentioned box caissons adjoining one another and superimposed onto one another with a longitutidinal gap, it is possible to make the foundation 11 and to perform the elevation 12 of the weir indicated at 13.
In particular, the hollow formation of the weir, indicated at 14, is laterally delimited by the trapezoidal box caissons 5.
At the top of the box caissons defining the bottom line of the hollow, moreover, there are restrained, by means of rods passing through the holes 10, the rectangular plates or cover plates 7.
The latter, in operation, will provide a better stability for the construction, and, moreover, will favour the flowing of the water.
Downstream of the mentioned weirs there is provided a sill element 15, which is suitably slanted, and which is obtained by joining and mutually restraining a plurality of plates 6.
At the end of the mentioned sill, there is provided a cross beam 16, made of box caissons, followed by two or more rows of plates 6, equal to the above indicated plates, but not restrained.
In this connection it should be moreover added that after installation, the mentioned box caissons will be filled by ciment mortar, concrete or the like.
From the above disclosure and the figures of the accompanying drawings, it should be apparent that the present invention fully achieves the intended aim and objects.
While the invention has been disclosed and illustrated with reference to a preferred embodiment thereof, it should be apparent that the disclosed embodiment is susceptible to several modifications and variations, all of which will come within the spirit and scope of the appended claims.