SADE-Magyarország Mélyépít Kft.1117 Budapest, Budafoki út 72-74.Tel.: +36 1 205 6078 – Fax:+36 1 205 6065sade@sade.hu - www.sade.hu

Advantages

• Social benefits

- Minimal surface disruption for local inhabitants and businesses

- Minimal reinstatement

- Reduced requirement for utilities diversions in urban areas

• Technical benefits

- Crossing with high precision under a wide range ofconstruction

- Performs well above or below groundwater

- Accurate line and grade control

- Less weather conditions disturbance

• Environmental benefits

- Vegetation preserved and landscape damage reducedbecause of limited earthworks

- Noise, dirt and smell minimised

•Maximum work safety

- Shielding only for launching and receiving shafts

- No interference with pedestrian and motor traffic

- Negligible ground settlement

Microtunnelling

T R E N C H L E S S

T E C H N O L O G Y

Technical principle

The technique, also known as pipe jacking, uses a microtunnelling

boring machine - MtBM:

• Construction of thrust / launching and reception pits / shafts foringress and egress of the MtBM

• Installation of the tunnel boring machine into the thrust pit• Lowering of short pipe lining sections into the pits which aresimultaneously jacked towards the reception or intermediate shafts

all whilst the MtBM excavation works is being performed

• Removal of the MtBM at the reception pit at the end of the operation

Equipment

• Containers- Steering movement in any direction allows operator to correct alignment

or curve the drives with a simple push of a button;

- For excavation, the cutting head is equipped with specific tools according

to geological ground conditions (loose grounds, rocky grounds…).

• Separators- A slurry system uses water based fluid to transport excavated soils from

the tunnelling machine to the surface where the excavated soil is removed

from the slurry.

• Guidance system by laser, gyroscope, hydraulic water level system• Automated control of lubrication injection points• Interjack stations implemented in order to redistribute the total requiredjacking force in the pipeline

Tunelling is SADE Group's area of expertise.

Since its origin in 1994, SADE Hungary appliespipe jacking technologies. Its staff has also high-skilled experience in traditional tunnelling sincethe 80th and in microtunnelling since 1998.

The Company is engaged in a continuous extension anddevelopment of mictrotunnelling activities based on itsexperience, performances and productivity.

Context

Projects are faced with constraints:

• technically: crossing of adjacent obstructions suchas transport infrastructure, natural barriers, or

overcoming difficulties such as ground conditions,

stability, ground water…

• environmentally: reducing disturbances, surfacepreservation, reducing the carbon footprint…

• economically: optimising costs and performancein comparison with traditional open trench

techniques…

Scopes of application

•Water networks (sewerage systems and drinking

water networks), energy networks and

telecommunications networks

• Diameters tunnels (ou tunnelling) from 250 to3000 mm

• Gravity or pressurised

pipelines in reinforced concrete, GFRP

(Glass fibre reinforced plastics),

polymer concrete

• Crossing of adjacent obstructionssuch as transport infrastructure,

natural barriers, or overcoming

difficulties such as ground

conditions, stability, ground

water…