No personnel are required inside the tunnel.
Intermediate jacking stations allow lying long stretches of pipelines.
The MTBM has a continuous monitoring laser-guided system, which detects and corrects any online trajectory errors (by adjusting the thrusting force of the hydraulic jacks and of the directional drilling units located in the casing pusher).
Ground deformations are minimized or eliminated (which is made...
APPLICATIONS
– depending on the results of the hydrogeological investigations:
– above groundwater;
– below groundwater.
– depending on the results of the geological and geotechnical investigations:
– in cohesive and non-cohesive soils;
– in soft and solid rocks;
– challenging in the presence of sand and gravel.
TECHNICAL DATA
– bore diameter dmin – dmax...
THIS TRENCHLESS TECHNIQUE IS USED TO INSTALL OPEN PIPELINES (STEEL, CONCRETE, GRES, PRFV, POLYCRETE) RANGING BETWEEN 100 mm AND 3000 mm IN DIAMETER. HYDRAULIC JACKS LOCATED AT THE TUNNEL ENTRY ARE USED TO PUSH IN SEQUENCED PIPE ELEMENTS TO FORM THE LINE.
A temporary (suitably sized) thrust wall is constructed to provide a reaction against the jacks.
Jacking equipment depends on the type of soil, on the diameter and...
THIS TECHNIQUE ENABLES INSTALLATION OF OPEN STEEL PIPES WITH THE USE OF SPECIAL PNEUMATIC RAMMING MACHINES WHICH APPLY IMPULSIVE STRESS.
When propulsion begins, the pneumatic ram is sited at the back end of the excavation and is self-supported by stretchers that connect it to the pipe.
No hydraulic jacks or any structure providing a reaction to them are required.
During drilling spoil accumulates in the pipe, from...
TECHNICAL FEATURES
non-steerable boring technique;
only straight path;
good planimetric and altimetric accuracy of the drilling
APPLICATIONS
depending on the results of the hydrogeological investigations:
above groundwater;
under groundwater only in watertight soils.
depending on the results of the geological and geotechnical in cohesive soils;
in non-cohesive soils (sand and gravel).
TECHNICAL DATA
minimal depth...