Tunneling

Welding of Thermoplastic Geomembranes for Tunnel Sealing

Versatile and Reliable

Plastic Welding Civil Engineering Tunneling — TWINNY T

Tunnel geomembranes are utilized in surface mining or deep mining. Once the concrete casing is complete, a plastic sealing system made from HDPE, 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 handheld extrusion welders, hand welding tools (heat guns), 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 HDPE, PP, PVC or TPO materials. Welding seam tensiometers improve safety. A broad spectrum of different extrusion welders and heat guns completes the range.

Efficient welding with machines for overlap welding, plus "overhead welding"
Welds with test channel
Handheld extrusion welders for the welding of connections and details, as well as patches and repairs
Tensiometers for checking the tensile load and integrity
Recording of data with a USB memory system
Wide range of hand welding tools and accessories

Combi-wedge Welders

TWINNY T

The TWINNY T is excellent for welding PVC and other thin or soft membranes.

TWINNY T USB

TWINNY T USB makes data storage and is excellent for welding PVC and other thin or soft membranes.

TWINNY S

This lightweight tool TWINNY S is optimized for overhead welding and is ideal for thin materials used in civil engineering and tunnel construction.

COMET

The small powerhouse, COMET, is specially designed for the demands of landfill sites, mines and tunnels.

COMET USB

COMET USB's memory system is designed for use on construction sites, because this compact, hot-wedge welding machine records all relevant welding parameters.

TRIAC DRIVE AT

The TRIAC DRIVE AT are up to three times faster than manual welding. The unique, semiautomatic welding tool.

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 and other areas of use

Hot-air welder TRIAC DRIVE AT with guide help

TRIAC DRIVE ST

More consistent and up to three times faster than manual welding with the TRIAC DRIVE ST.

WELDPLAST S2

The WELDPLAST S2 is a compact, ergonomically designed workhorse. The handy size extrurusion welder puts out two kilograms per hour without difficulty.

WELDPLAST S2 PVC

The WELSDPLAST S2 PVC has integrated corrosion protection and has been especially designed to satisfy the high requirements of PVC extrusion welding.

WELDPLAST S2 TPO

The WELDPLAST S2 TPO is a compact, ergonomically designed workhorse. The handy size extruder puts out two kilograms per hour of extrudate and welds TPO materials without difficulty.

FUSION 2

The FUSION 2 convinces with its ergonomic design. The simple operation and first-class welding quality have helped it to become the breakthrough product.

FUSION 3

With its long and narrow shape, the FUSION 3 enables comfortable work, even on the floor.

TRIAC AT

The TRIAC AT is an intelligent hot-air hand tool for welding and shrinking plastics that is suitable for on-site use.

TRIAC ST

Handiness, reliability and versatility are the key arguments in favor of the TRIAC ST

EXAMO USB

EXAMO USB performs tests at the construction site – quick, reliable and uncomplicated.

Test needle

Air pressure test manometer used in civil engineering for proving the tightness of double welding seams.

Test needle (tapered)

Air pressure test manometer used in civil engineering for proving the tightness of double welding seams.

Leister Air pressure test manometer tapered

VACUUM BELL

Testing bell for proving the tightness of double overlap welding seams in civil engineering

VACUUM BOX

Weld seam testing made quick and simple

VACUUM PUMP

Pump to generate a vacuum in the VACUUM BOX