It has application in the construction industry.
Nowadays, the anchorage system is done by means of continuous studs which are inserted into the foundation and joined to the base with screws. The diameter of these studs may be variable, although it is usually of 20 or 22 mm, which gives it extreme stiffness, given the impact of a vehicle, provoking strong decelerations on it which lead to serious injuries or even the death of the occupants of the vehicle.
Anchorage systems for lampposts, masts and poles for supporting vehicular traffic signs are known from the prior art.
The present invention, as its own title states, makes reference to a completely new system of anchorage for lampposts and other elements of the urban furniture. The main objective of this invention is to create a system of anchorage with the necessary resistance under current regulations to hold the lamppost or the element, but it must also have a controlled resistance given the impact of a vehicle.
This is achieved by means of the insert of an anisotropic resistance coupling into the foundation studs, as it can be seen in the picture. This is a valid solution because there is a basic difference between the stresses during the life of the lamppost and the stresses generated by the impact of a vehicle.
During its normal use, a lamppost mainly undergoes the wind stresses and the weight of the own lamppost. These stresses will generate on the system of anchorage sharp stresses of little value and flector moments which will cause traction-compression stresses in the foundation studs.
When the impact of a vehicle aginst the lamppost takes place, the main stresses generated are horizontal therefore, regarding the layout of the studs, they are of sharp type.
Taking all this into account, the coupling that has been designed presents a high resistance in case of traction-compression stresses, because it causes the overlap of geometries in a large area, and its dimensions have been designed so that it can support the stresses with some little deformations. When a horizontal stress on the lamppost, sharp on the couplings, takes place, taking into account their geometry, the two parts of the coupling can split up because the upper part of the coupling is stiffly joined to the upper stud and the lower part is joined to the other stud. Thus, the stress applied by the vehicle is transmitted to the upper part of the coupling, which will split up from the lower part because it is stiffly joined to the foundation. Thanks to its geometry in the shape of "C", and thanks to the fact that this movement is not completely guided, it allows that this type of coupling works properly in three directions, whereas there is one where there cannot be any separation between the two parts. Therefore, this direction must correspond with the direction of the vehicle which impacts from the exterior of the lane to the roadway because this is the direction that presents less possibility of accident.
It has been previously mentioned the controlled stiffness of the coupling, given an impact of a vehicle. This control is achieved by means of the use of a mechanical fuse which joins both parts, as it can be seen in
The pictures included in the present report try, on the one hand, to show in a graphic way how these couplings must be placed in the system of anchorage and, on the other hand, to give an idea about how the geometry of this anisotropic stiffness coupling must be.
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