Single-seal and modular expansion joints B2N

B2N expansion joints are intended to be used in bridges of every category of the traffic (including KR7 according to Polish specification) and every type of bridge structures (road, railway and for pedestrians). They ensure a long-term durability no matter of intensity of exploitation. The expansion joints are watertight, tailored for particular geometry of the bridge as well as for the client’s requirements. They might be installed in a fast and easy manner.


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.



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.


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
Number of modules B2N expansion joint type 80 B2N expansion joint type 100 B2N expansion joint type 150

Range of movements



Range of movements



Range of movements



B2N 80/1S


B2N 100SL/1S


B2N 150/1S



B2N 80/2S


B2N 100SL/2S


B2N 150/2S



B2N 80/3S


B2N 100SL/3S


B2N 150/3S



B2N 80/4S


B2N 100SL/4S


B2N 150/4S



B2N 80/5S


B2N 100SL/5S


B2N 150/5S



B2N 80/6S


B2N 100SL/6S


B2N 150/6S



B2N 80/7S


B2N 100SL/7S


B2N 150/7S



B2N 80/8S


B2N 100SL/8S


B2N 150/8S



B2N 80/9S


B2N 100SL/9S


B2N 150/9S



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.

Technical data


Technical specification

National Technical Assessment no. IBDiM-KOT-2018/0219 

National Technical Assessment no. IBDiM-KOT-2018/0225
European Technical Assessment no. ETA-19/0320 (B2N single-seal expansion joints)

Indended use  

The B2N expansion joints (type 80 and type 100) are intended for use in traffic engineering:

  • in bridges with a steel, composite reinforced-concrete or prestressed structure
  • on roads of any traffic load category
  • in bridge structures located in regions of mining damage


The B2N expansion joints (type 150 with a protective plate) are intended for use in traffic engineering:

  • in railway or tram bridge structures and in structures intended solely for pedestrian and bicycle traffic

Range of movements

B2N type 80: from ±40 to ±360 mm

B2N type 100: from ±50 to ±450 mm

B2N type 150: from ±75 to ±675 mm

Material of steel profiles

B2NS variant: S355J2 (non-alloy steel)
B2NN variant: head - 1.4301 or 1.4571 (stainless steel), angle bar - S355J2 (non-alloy steel)

Material of noise-reduction plates

S355JR (non-alloy steel)

1.4301 lub 1.4571 (stainless steel)

Type of support of intermediate beams

Traverse mechanism

Corrosivity category

C5 (EN ISO 12944-5:2019)


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.



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.



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.





Modułowe urządzenia dylatacyjne B2N (1).jpg

1 Rozporządzenie Ministra Transportu i Gospodarki Morskiej z dnia 30 maja 2000 r. w sprawie warunków technicznych, jakim powinny odpowiadać drogowe obiekty inżynierskie i ich usytuowanie (Dz. U. z dnia 3 sierpnia 2000 r.)
2 Rozporządzenie Ministra Infrastruktury i Budownictwa z dnia 17 listopada 2016 r. w sprawie sposobu deklarowania właściwości użytkowych wyrobów budowlanych oraz sposobu znakowania ich znakiem budowlanym
3 Rozporządzenie Parlamentu Europejskiego i Rady (UE) nr 305/2011 z dnia 9 marca 2011 r. ustanawiające zharmonizowane warunki wprowadzania do obrotu wyrobów budowlanych i uchylające dyrektywę Rady 89/106/EWG