Univergom designs and manufactures, in compliance with national and international standards, equipment to support reinforced concrete or metal structures.
In fact, the bearings are intended to back and, therefore, optimise the deformations and movements foreseen for the structure, whether they are slow (for example, those caused by temperature, shrinkage, creep, prestress, etc.) or instantaneous (such as braking actions in the case of bridges, the actions of wind, earthquakes, etc.), thus handling the design loads and minimising the parasitic actions harmful for the structure.
The elastomeric bearings produced by Univergom, CE MARKED, meet all the designers' requirements. They are fitted, upon request, with the suitable external fixing systems and/or sliding systems.
CERTIFIED RUBBER COMPOUNDS
The compounds used for the production of Univergom bearings can be made of either natural rubber (NR) or neoprene (CR), in compliance with the most common EN 1337-3 and AASHTO international standards. Univergom uses only certified and controlled compounds, specially formulated for withstanding atmospheric agents, UV rays and ageing.
All the elastomeric bearings for bridges produced by Univergom are marked during the moulding phase with an indelible marking including the bearing data and the purchase order so as to ensure the product perfect traceability.
All the steel elements exposed to atmospheric agents are protected by means of the application of an anticorrosive coating complying with international standards and with the EN 1337-9 standard.
Elastomeric bearings are classified according to the EN 1337/3 standard.
They are divided into the following groups:
TYPE "A" BEARINGS
A-type bearings consist of two layers of rubber separated by and vulcanised to a sheet-steel. This type of bearing, unlike F-type bearings, is suitable to transfer
dynamic horizontal actions.
TYPE "B" BEARINGS
In its simplest version, this type of bearing is made up of a support manufactured by alternating layers of vulcanised elastomer and reinforcement plates. As foreseen by the design, such reinforced bearing can be used directly as a support or inserted in suitable structural devices, making more complex constraints in the structure (see type c-d-e bearings).
TYPE "C" BEARINGS
During the vulcanisation process, it is possible to add one or two external plates to the type "B" support elastomeric bearing in order to anchor the structure efficiently.
Depending on the design requirements, there may be different types of external plates, such as:
- external plates suitable for castings of structures under construction, fitted with fixed or movable cramps, or holes for anchoring bars
- external plates with anchoring bolts for a counterplate fixed to the structure
- external plates stamped or machined to increase the adhesion of the support to the structure by sticking it using resins or mortar.
- external plates with threaded holes for fixing the bearings to metal structures.
TYPE "D" and "E" BEARINGS
These bearings work as mobile constraints in any direction. In fact, on the upper surface of these bearings, a layer of PTFE is vulcanised in order to favour the sliding of a mirror polished, stainless steel upper plate.
Should it be necessary to make a unidirectional and fixed constraint at right-angle, the support will be equipped with two external plates fitted with anchoring cramps and suitable guides for supporting the design transversal loads (Guided type "D" bearing).
Type E bearings are fitted with an external elastomer vulcanised plate in which a layer of PTFE is embedded.
TYPE "F" BEARINGS
F-type bearing is used for the tying of simple structures, made of concrete or metallic structures in which no particular capacity of resisting external actions (forces and deformations) are required.