Expansion Joint Types
 
This section provides basic descriptions of available joint types. To view joint drawings click the respective joint image. In addition proprietary joint data is available on this page.
 

Buried

One or more components may be used to form continuity of the waterproofing and surfacing. These can comprise of proprietary flashings and straps with bridging plates or similar.

Movement ranges generally ±10 mm .

Asphaltic Plug

Proprietary systems comprising of layers of specially modified binders and aggregate to provide a homogeneous expansion medium and smooth running surface.

Movement ranges for standard grade modified binders up to ± 20 mm.

Elastomeric with Metal Runners Cast into Deck

A combination of pre-fabricated machine extruded rails with rubber seals between them. Can be single element or multi-element. Permantly fixed to the reinforcement of the structure.

Movement upto 80 mm for single element and upto 1000 mm for multi-element.

Elastomeric with Metal Runners Resin Encapsulated

Precision extruded metal rails set between special resins forming combined nosings and bed, stuck down to the structural concrete and surfacing. Incorporating various sizes of watertight seals fitted between the rails.

Movement range upto 150 mm.

Cantilever Comb or Tooth

A prefabricated precision made joint consisting broadly of two sets of finger plates set or fixed across the joint gap with a separate flexible waterproof membrane sheet clamped beneath the plates.

Movement range: standard 440 mm, non-standard 1000 mm.

Nosings

Insitu resins or cementitious mixtures placed either side of the bridge deck air gap to produce firm edges and protect the surfacing. Complete with watertight extruded compression seal or sealant.

Movement ranges: upto 50 mm with preformed seals and upto 12 mm with poured sealant to BS5212

Reinforced Elastomeric

A joint prefabricated to exact lengths and widths, comprising of rubber surrounding metal elements, bearing plates and reinforcement. Placed onto flate beds with resin strips either side as a protection and to provide a smooth running surface. Bolted directly to the structural concrete or to a prefabricated metal cradle set into the structure during the construction of the deck and ballast walls.

Movement range: upto 350 mm. Different widths of carpet pose limitations on movement accomodation. Consult supplier.