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technissis.gr > Products > Leister > Civil Engineering > Tunneling
Welding of plastic geomembranes for sealing tunnels
Versatile and reliable

TWINNY T

Tunnel geomembranes are utilized in surface mining or deep mining. Once the concrete casing is complete, a plastic sealing system made from HD-PE, PP, PVC or TPO is usually used to provide protection from any penetrating moisture. The individual sheets are laid perpendicular to the direction of the tunnel. Lightweight and flexible welding machines are required for this "overhead welding". Leister offers several suitable machines in the form of the TWINNY, COMET, and TRIAC DRIVE AT. Details can be welded easily and ergonomically with the hand extruders, hand welding tools, and matching accessories.

  • Overlap welding of geomembranes in tunnel construction
  • Welding seam quality which can be inspected
  • Overhead welding
  • Welding of details
Leister has the solution
Leister offers various hot-wedge and combi-wedge machines for welding HD-PE, PP, PVC or TPO materials. Welding seam tensiometers improve safety. A broad spectrum of different hand extruders and hand welding tools completes the range.
  • Efficient welding with machines for lap welding, plus "overhead welding"
  • Welds with test channel
  • Hand extruders for the extrusion welding of connections and details
  • Tensiometers for checking the tensile load and integrity
  • Recording of data with a USB memory system
  • Wide range of hand welding tools and accessories

Hot-air hand tools
TRIAC AT
The TRIAC AT is an intelligent hot-air hand tool for welding and shrinking plastics that is suitable for on-site use.
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TRIAC S
The competitive hand tool. Deployed worldwide and very reliable, compact and robust.
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TRIAC ST
Handiness, reliability and versatility are the key arguments in favor of the TRIAC ST.
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Extrusion Welders
FUSION 2
The FUSION 2 convinces with its ergonomic design. The simple operation and first-class welding quality have helped it to become the break...
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FUSION 3
With its long and narrow shape, the FUSION 3 enables comfortable work, even on the floor.
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WELDPLAST S2
The WELDPLAST S2 is a compact, ergonomically designed workhorse. The handy size extruder puts out two kilograms per hour without difficulty.
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WELDPLAST S2 PVC
The WELSDPLAST S2 PVC has integrated corrosion protection and has been especially designed to satisfy the high requirements of PVC extrus...
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WELDPLAST S2 TPO
The WELDPLAST S2 TPO is a compact, ergonomically designed workhorse. The handy size extruder puts out two kilograms per hour an can even ...
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Hot-wedge Welders
COMET
The small powerhouse COMET is specially designed for the demands of landfills sites, mines and tunnels.
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COMET USB
COMET USB's memory system is designed for use on construction sites. Because this compact hot-wedge welding machine records all relevant ...
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Combi-wedge Welders
TWINNY S
This lightweight tool TWINNY S is optimized for overhead welding and is ideal for thin materials used in civil engineering and tunnel con...
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TWINNY T
The TWINNY T is excellent for welding PVC and other thin or soft membranes.
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TWINNY T USB
TWINNY T USB makes data storage and is excellent for welding PVC and other thin or soft membranes
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Semiautomatic hot-air tools
TRIAC DRIVE AT
The TRIAC DRIVE AT are up to three times faster than manual welding. The unique, semiautomatic welding tool.
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TRIAC DRIVE AT with guiding help
The TRIAC DRIVE AT with welding guide, inside nozzle or outside nozzle, the unit is suitable for all roofing and tunneling applications ..
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Testing instruments
Test needle (tapered)
Air pressure test manometer used in civil engineering for proving the tightness of double welding seams.
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Test needle
Air pressure test manometer used in civil engineering for proving the tightness of double welding seams.
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COUPON CUTTER
Robust weld test cutter for use in civil engineering.
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EXAMO USB
EXAMO USB performs tests at the construction site quick, reliable and uncomplicated.
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VACUUM PUMP
Pump to generate a vacuum in the VACUUM BOX
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VACUUM BELL
Testing bell for proving the tightness of double overlap welding seams in civil engineering
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