Omega Seal Expansion Joint

Main components are Omega Seals, Steel Plates and Nut & Bolts.

• Omega Seal Expansion Joint for Railway Bridges.
• Surface shall be 1% slope in order to get water drained as shown in figure.
• Steel bolt shall be inserted into the recess made in the deck and to be filled with M 35 grade concrete.
• Cap seal to be positioned on both sides of the decks such a manner that the omega shape covers the gap and the plain surface are perfectly sat on the deck slab.
• Galvanized steel plate(80 X 80mm) having oblong hole (40 X 20mm) to be placed on the plain surface of the seals at both sides such a manner the bolt is inserted through the oblong hole. Seal also to be punched with a hole suiting to oblong hole of the steel plate to enable to get inserted through the bolt.
• Nut to be tightened on every bolt properly and tack welded to ensure the locking.
• On completion of installation, every aspects to be checked for proper installation.
• Wearing coat shall be done with proper care without disturbing the seal.

STEEL PLATE:

• It is hot dip galvanized steel plate of 80mm wide x 8mm thickness with oblong holes of 40 x 20mm in every one meter.
• RIGID BOLT:
• The rigid bolt will be anchored to the both decks by reinforced concrete, in every one meter, all along. After installation
• elastomeric seal and steel plate inserting into the bolts anchored in the decks, the nut to be tightened well and tack
• Welded. The dimension of the bolt will be 16mm dia @ 400c/c.
• It is made out of chloroprene elastomer to the shape Omega,by compression moulding process. The seal with omega
• shaped design will be cast as single unit in a mould and vulcanized under uniform heat and pressure. The mould used for
• manufacturing such seal will be free from defects and will have polished surfaces in order to get the elastomeric seals free
• From any surface blemishes.
• Chloroprene elastomer is used to manufacture such seals and they are with low crystallization rates and adequate shelf
• Life. Generally Neoprene WRT, Bayprene 110, Skyprene B5 and Denka S 40V are used as raw material of Chloroprene
• Elastomer.

THE PHYSICAL PROPERTIES OF THE ELASTOMERIC SEAL WILL BE AS FOLLOWS:

• Hardness: 63 (+/-) 5 in shore A scale
• Tensile strength: 17Mpa Minimum
• Elongation at break: 400% Minimum
• Compression set: 35% Maximum
• AFTER ACCELERATED AGEING:
• 28. - Change in hardness: + 15 Maximum
• 29. - Change in tensile strength: - 15% Maximum
• 30. Change in elongation: - 40% Maximum.