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mageba sa
Trafostrasse 1
8180 Bulach
Switzerland
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Switzerland
Bridge over the Boiron in Saint-Prex
Project description
The Bridge over the Boiron River, owned by the Swiss Highway Authority FEDRO-ASTRA, is a highway bridge located between Lausanne and Geneva.
The structure, originally built in 1964, has a curved shape, which means that the thermal expansion of the structure creates a transverse movement, that can damage the installed expansion joint equipped with sinus plates.
mageba scope
When the expansion joint was originally installed, guided bearings were already in use to absorb the horizontal tension caused by the movement of the structure. However, these bearings were removed subsequently, which made the situation critical for the expansion joint and therefore also for traffic safety. The sinus plates on the surface of the joint came into contact with each other, transferring enormous forces to the structure itself, and damaged one side of the installed joint.
mageba proposed the use of two vertically installed RESTON-POT LIFT-CONTROL TA3 injectable pot bearings on each abutment to ensure a permanent horizontal guidance. After installation a special resin-based compound was injected in each bearing, which enables a progressive and controlled resetting of the products.
During the injection process, the contact pressure was permanently controlled using a special sensor and mageba’s ROBO-CONTROL portable monitoring system. After the successful installation of the bearings, our team of experts refurbished the damaged expansion joint.
Injection of an installed RESTON-POT LIFT-CONTROL bearing with a resin-based compound
Refurbished expansion joint under traffic
Key Data
Products: | RESTON-POT LIFT-CONTROL bearings, ROBO-CONTROL portable monitoring system |
Feature | The bearings feature pressure sensors and have lifting capacity |
Installation: | 2018 |
City: | St-Prex |
Type: | Highway concrete bridge |
Length: | 200 m |
Owner: | Swiss Highway Authority (FEDRO-ASTRA) |
Built: | 1964 |
Contractor: | Kung et Associes SA |
