The pot bearings are most frequently used as a support for a superstructure. Their features are high load capacity coupled with relatively small size, the installation is easy and the inspections might be undertaken with little effort. They are capable of operating in very low temperature and as well as in the seismic areas. They fit well for prestressed structures both in stage of post-tensioning and afterwards during further exploitation.
Products
Pot bearings
Construction
The pot bearing consist of a lower part (pot) in which elastomeric pad is confined by the piston. As the elastomeric pad behaves like a liquid when subjected to the load, the possible escape of it during rotation is prevented by the brass seal. The bearing which allows for movements is furthermore equipped with a sliding surface consisting of PTFE sheet and stainless austenitic sheet. To protect the sliding surface against the dust there are used seals located around the PTFE sheet.
Types of pot bearings
The pot bearings combines the following properties – carrying of the loads from the superstructure to the substructure (vertical and horizontal) and allowing for the linear and rotational movements.
The following types are distinguished:
- fixed (with symbol FX),
- guided sliding (with symbol GG),
- free sliding (with name GL).
|
Type of bearing |
Reactions |
Movements |
Rotations |
|||||
|---|---|---|---|---|---|---|---|---|
|
N (vertical force) |
Vx (horizontal force alongaxis “x”) |
Vy
(horizontal force alongaxis “y”) |
vx
(movement alongaxis “x”) |
vy
(movement alongaxis “y”) |
αy
(rotation aroundaxis „x”) |
αy
(rotation aroundaxis „y”) |
||
|
fixed (FX) |
+ | + | + | - | - | + | + | |
|
guided sliding (GG) |
+ | - | + | + | - | + | + | |
| + | + | - | - | + | + | + | ||
|
free sliding (GL) |
+ | - | - | + | + | + | + | |
In case of uplifting forces the bearings must be properly designed to withstand them. However the bearings which are subjected to uplift force are not covered by the standard EN 1337-2:2005 and cannot be marked with CE.
Technical data
|
Harmonized standard |
EN 1337-5:2005 |
|
Indended use |
in bridge structures or any other structure with comparable support conditions where requirements on individual bearings are critical |
|
Maximal designed vertical load capacity |
50 000 kN |
|
Maximal rotation capacity |
±0,03 rad |
|
Construction material |
steel grade S355 |
|
Sliding material |
PTFE |
|
Corrosivity category |
C5 (EN ISO 12944-5:2019) |
|
Operating temperature |
from -40 °C to 50 °C (bearings without sliding elements) from -35 °C to 50 °C (bearings with sliding elements) |
Additional information
If the bearing is designed for movements which exceed ±50 mm, it features additional movement capacity ±20 mm obliged by the standard. In order to accommodate the effects of elastic and rheological contraction which naturally happen in post-tensioned structures, it is recommended to apply presettings of sliding plates in order to prevent excessive movements in starting of operation. The pressetings might also be required if the actual temperature of the structure is other than nominal temperature resulting from EN 1991-5 (8°C). However, in many cases, the movement due to the difference between actual and nominal temperature is so small that it is covered by additional movement capacity.
Accessories
Our bearings are equipped with nameplates which present the basic characteristics (i.e. trade name, allowable loads both vertical and horizontal, allowable movements and rotations as well as information about place of installation and the manufacturer).
Movable bearings are equipped with movement indicators. On client’s request, it is also possible to install the anti-dust skirts.
Documents
The bearings manufactured by B2 have the Certificate of Constancy of Performance no. 0754 – CPD – 10-0705 issued by Karlsruher Institut für Technologie. According to the regulations1, the bearings are CE-marked and have the Declaration of Performance issued, which are delivered to the customer at the latest with the delivery.
Offer
Our offers are tailored to the individual customer’s needs, therefore we do not follow any catalogue solutions. We focus on high quality and short production and delivery time.
We encourage to contact with us and send the inquiries by the following link: Contact.
Additional technical and legal information might be found at Knowledge base.
1 Regulation (EU) No 305/2011 of the European Parliament and of the Council of 9 March 2011 laying down harmonised conditions for the marketing of construction products and repealing Council Directive 89/106/EEC
