Tunnel Segment Gasket (TSG) INFORMATION
Elastomeric (rubber) gaskets make up one of the most effective systems for segmentally lined tunnels where sealing is required against water ingress, or for retention in tunnels used for fluid transport or storage.
The gaskets are manufactured from high-grade rubber compounds, which meet many internationally recognised standards including BS EN681-1; the material requirements standard for pipe and joint seals used in water and drainage applications.
The complex section of the gaskets is designed to provide the energy within the seal, generating the sealing function once the segments have been assembled, whilst minimising closure forces.
VIP offers a range of gaskets to suit various applications and specifications. In addition, its team of technical engineers have the experience and detailed knowledge to design bespoke gaskets for unique conditions. Their experts also prove the gasket in its dedicated test facility, which replicates the segment assembly, build conditions and sealing pressures.
The gasket section is extruded through one of the most modern microwave curing lines, then cut and joined to suit the segment requirements.
The corner joints are manufactured in obtuse, acute and 90° angles to fit with the corresponding segments. Their design ensures that the sealing properties and closure forces match the extruded gasket section.
VIP-Polymers: Standard Gaskets
The above gaskets are located and glued into the groove except VIP028CI which is cast in to the segment.
Gaskets are tested in specially designed test rigs, which replicate the build of a segment ring.
T & X TEST RIGS
T & X rig testing is carried out at our in house testing facility in Huntingdon as required.
Tests are undertaken at maximum and minimum gaps, and zero-to-maximum offset/ deflection.
Diagram showing typical pressure curve
VIP also manufactures a hydrophilic gasket, which swells when in contact with water and does so in three main formats:
1. Simple Hydrophilic Strip
2. Hydrophilic Cord Inserted into a slot in a TSG prior to installation
Hydrophilic Strip Integrally Bonded onto an Elastomeric TSG
VIP can recommend a number of approved adhesive suppliers for the application of the gasket on to the segment. If required, we can also arrange the supply of the adhesive.
VIP recommends applying lubricant to the surface of the gasket to assist the segments sliding
into place. We can recommend and supply an appropriate WRC-approved lubricant.
TSGs should be stored in the same conditions as for most elastomeric products and ideally in accordance with ISO 2230 (rubber products guidelines for storage). VIP can supply details upon request.
VIP operates a quality system, which is approved to ISO 9001 standard and certified by BSI. We are renowned in the seal and gasket industry for the high quality of all of our products, and our approach to quality extends to TSGs.
Specifies classes of dimensional tolerances and their values for moulded, extruded, and calendared solid rubber products.
Elastomeric seals. Material requirements for pipe joint seals in water and drainage applications.
BS ISO 2230:2002.
Rubber products. Guidelines for storage.