Segment Sealing Gaskets

Since 1968, PDT has been developing compression seals for tunnels produced with shield tunnelling machines that are lined with prefabricated segments of steel or reinforced concrete.

Diverse Profile Geometries

Since the pilot project "New Elbe Tunnel" in 1969, PDT has responded to the constantly growing demands by developing more than 50 different profile geometries which are in use in more than 200 tunnel projects all over the world.

Special Solutions

In addition to the standard range illustrated here, PDT also offers special solutions. This successfully covers the bandwidth of different demands, starting with supply and disposal pipes through to major traffic tunnel projects.

Tubing Sealing Frames – Standard Tunnel Profiles
	Type Elbe tunnel M 385 65 · groove 46 x 19 mm
	Type St. Clair M 385 40b · groove 33 x 14 mm
	Type Tokyo Route 12 M 385 41a · groove 26 x 10 mm
	Type Lille M 385 43b · groove 29 x 7,5 mm
	Type Weser tunnel M 385 73 · groove 44 x 12 mm
	Type Groene Hart M 385 87a · groove 36 x 12,5 mm
	Type Lesotho M 385 44 · groove 33 x 10 mm
	Type Caracas M 383 92 · groove 26 x 6 mm

Innovative Seals and Particular Specialities
	The innovative seal: Anchored within the concrete tubing, this option offers an array of advantages with regard to safety and installation. These seals do not require adhesive and therefore they also save on labour costs and negate the need for environmental precautions to be taken.
	A particular speciality: The "Evolution Seal” combines two different sealing technologies – a compression seal and a hydro-swelling strip. Using this system the capsulated hydro-swelling strip offers additional safety without the typical disadvantages.