Products for trenchless pipe installation and renewal

As a leading manufacturer of trenchless technologies, Tracto-Technik (TT) develops and produces boring systems for the underground installation and renewal of pipes. The TT product range comprises individual solutions for all trenchless installation and renewal techniques.

Soil Displacement Technique

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Soil displacement technique- The soil displacement hammer is driven by compressed air at a pressure of 7 bar. A cylinder-shaped piston drives the casing through soil and rocks and displaces it creating a stable soil tunnel. The pipe (protection or product pipe) is pulled in at the same time - either as a short pipe or directly from the pipe coil. Groundomat soil displacement hammers can be controlled, but not steered.

Specifics • applicable for all soil conditions except for mud, marshes and nondisplaceable solid rock • we recommend the guided mole Grundosteer for blind bores up to60 m

(First steerable soil displacement hammer) Steerable soil displacement hammer Grundosteer (first steerable soil displacement hammer) The steerable soil displacement hammer Grundosteer is suitable for lengths up to 70 m, which by using a detection and steering system, can avoid any underground obstacles and depending on ground conditions, can carry out steered bores with a minimal radius of 27 meters. This is a dry boring method, which is mainly used over long and blind house-connections.

GRUNDORAM - Pipe rammers

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Ramming technique- Without abutment, the open steel pipes are pushed forward with dynamic ramming energy. The soil gathering in the pipe is pressed or bored out with air and/or water after installation. The installation lengths depend on the soil conditions and the pipe OD. Rule-of-thumb: installation length = pipe Ø x 100 (i.e. pipe Ø ND 400 = 40 m)

Specifics • applicable in all soil conditions except for mud, marshes and non displaceable solid rock • high precision; thrust can be controlled, but is not steerable • acknowledged technique, Ruhrgas: Rating recommendable”. “ • no measures are required for keeping the front pit wall fromcollapsing • no risk of ground subsidence • no press abutment required

GRUNDOBURST - Static pipe bursting

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Static pipe bursting The bursting, displacing and pipe pulling forces of the hydraulic thrust and pull rig Grundoburst are transmitted via the patented rods. Static pipe bursting can be applied straight from the pipe coil for defective inliners and for pulling in pressure pipes. The system is surprisingly simple.

Specifics • Multiple use of Grundoburst for: - short or long pipe bursting - pipe replacement (pipe extraction) - swagelining measures - pipe lining and cleaning • Application from pit to pit (TIP)

GRUNDOCRACK - Dynamic pipe bursting

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Dynamic pipe bursting technique The old pipe is destroyed with the help of a bursting device and radially displaced into the surrounding soil. Brittle materials are shattered, tough materials are cut open. At the same time, a new product or host pipe of the same or larger diameter is pulled in. The ramming force for the bursting and pulling in process is supported by the pulling force of a winch.

Specifics • favourable for old pipes made of brittle materials (stoneware, concrete, cast iron, asbestos cement) • the gradient of the old pipe must be usable for the new line • side branches/bends require intermediate pits • distance to other existing lines nearby: 2-3 x old pipe Ø • the cover depends on the diameter of the new pipe

GRUNDODRILL - HDD technique

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HDD technique- When applying the HDD technique the pipe installation process is divided into the following working steps: 1. Establishing of the three-dimensionally controlled pilot bore from the drill rig to bore exit side (directional bore) 2. Upsizing of the bore hole to the required diameter while pulling back the drill rods and simultaneously pulling in the new pipe. The drilling fluid (water/Bentonite) plays an important part in a successfully executed installation. It helps to extract the soil, transportsthe soil to the outside and provides a supportive gliding quality. The drilling fluid is also responsible for wear reduction and lubrication of the drilling tools. The drill rig transfers the pressure and pulling forces as well as the torque onto the bore head via the bore string.

Specifics To overcome high soil-mechanical resistance great static thrust forces are necessary - Grundodrill rigs “outsmart” this resistance with additionally available dynamic ramming energy supplied by the percussive hammer. Special sondes can indicate a gradient in steps of 0.1%, thus enabling the installation of gravity pipes with a gradient of 2% in good soils.