The B2N expansion joints consist of steel profiles, angle bars, gusset plates and the anchoring loops. Between the edge beams the self-locking watertight elastomeric sealant is mounted.

In case of B2N modular expansion joints, the intermediate beams are supported by traverse beams. The spring elements are responsible for providing uniform distances between the beams.

The shape of the expansion joints is precisely adjusted to the geometry of the cross-section of the bridge. The length of one expansion joint might achieve up to 30 meters. On client’s request, one expansion joint might be technologically divided into shorter parts and prepared for further welding on site, which might be necessary for replacement of old expansion joint or where the length of expansion joint exceeds the limits. This operation is recommended especially for single-seal expansion joints.

Variants

The B2N expansion joints are designed in two variants:

• B2NS – made entirely of non-alloy steel
• B2NN – the upper part (head) is made from stainless steel and the bottom part is made of non-alloy steel (angle bar)

The advantage of B2NN variant is that the head is made entirely from stainless steel and the welded connection with the angle bar is performed beneath the recess in which the sealant is locked. It means that the weld is not prone to penetration of water and the de-icing agents.

Movements

B2N expansion joints are divided into two variants: single-seal (1S) and modular (2S-9S).

Each module might compensate the following movements:

• ±40 mm – type 80
• ±50 mm – type 100, equipped with noise-reduction plates
• ±75 mm – type 150, equipped with protective plate

The expansion joints are tested for dynamic resistance which proves the durability while being subjected to the recurring loads. The expansion joints manufactured by B2 fulfill the requirements of Road and Bridge Research Institute, which are more severe that those stated in ETAG 032 (parts 4, 6 and 8). The durability of B2 expansion joints might be assumed for 50 years. Therefore they meet the Polish requirement¹ for ability to service for at least 20 years.

Accessories

The B2N expansion joints type 100 are equipped with noise-reduction plates which are installed in the area of road traffic and which are made of non-alloy steel or stainless steel. The B2N expansion joints type 150 are equipped with plates which provide protection against intake of crushed stone.
 

On client’s request the B2N expansion joints might be equipped with sealants with draining tubes which provides dewatering. In this case water is removed from the sealant through the connector to the drainage system.
 

NOTE: the sealants with draining tubes require regular inspections, service and cleaning. The obstructions might lead to retention of water in the sealant and to expiration of manufacturer’s warranty.

Additionally, the expansion joint might be equipped with a membrane which reduces the noise. This membrane is installed underneath the expansion joint and reduces the propagation of noise which is a result of transition of the vehicles.

It is also possible to protect the gaps in the pedestrian and cornice areas by using cover plates, made from steel of aluminum. We offer also additional stay-in-place formworks fixed to angle bars which makes pouring of concrete into the recess much easier.

Documents

Modular expansion joints manufactured by B2 have the following documents issued:

• National Certificates of Constancy of Performance no. 052 – UWB – 044/1 and 052 – UWB – 045/1,
• National Technical Assessments IBDiM-KOT-2018/0219 and IBDiM-KOT-2018/0225, issued by Road and Bridge Research Institute.

According to Polish regulation, these construction products are marked with a construction mark (B) and the manufacturer issues National Declaration of Performance which are delivered to the customer at the latest with the delivery.

Moreover, the B2N single-seal expansion joints have European Technical Assessment no. ETA-19/0320 and Certificate of Constancy of Performance no. 0754 – CPR – 19-0251 issued. According to the regulation, to the product for which ETA was issued, the manufacturer affixes CE marking and draws up the Declaration of Performance.

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.