Tenax geocomposite for the drainage in tunnels and underground structures, Tenax geosynthetics

Geosynthetics

HOME PAGE

PRODUCTS

CASE HISTORIES

ASSISTANCE

EMAIL

Tunnels and underground structures

During the construction of underground concrete lined structures (tunnels in particular), it is necessary to prevent water from coming into contact with the completed tunnel lining that can cause both safety problems and increased maintenance costs. The use of TENAX MDP, specified for the interception and drainage of water inflows (even when under pressure), which inevitably tend to flow towards the excavation site, gives a uniform surface upon which the sprayed concrete is applied thereby reducing installation costs and giving a higher degree of impermeability.

Installation of TENAX TDP Geocomposite

Installation of TENAX TDP on the tunnel face

Completed installation of TENAX TDP prior to shotcreting. This system offers substantial savings over traditional methods

The geocomposite also functions as a “left in place formwork”, in addition to limiting the volume of concrete used, it allows for construction to proceed in accordance with the assumptions made during the planning stage thus allowing:

Constant thickness of finished reinforced concrete structures;
Uniformly distributed loads (even under point loads) and thus constant long-term hydraulic flow rates even when under considerable pressure;
Reduced shearing stress that could otherwise totally burden the structure;
Limited load transmission (even under dynamic loads) which can be caused by settlements and/or spreading deformations of the surrounding areas (the geocomposite acts as a semi-flexible element placed between the trench surface and the final structure).

If the need for an additional impermeable layer is foreseen, the TENAX MDP will protect it from rock puncturing, damages caused by microorganisms and from particularly corrosive soils, thus preserving the finished structure from rapid degradation.

PRODUCTS

TENAX MDP

TENAX TDP

TENAX International B.V. • Geosynthetics Division
Via Ferruccio Pelli, 14 CH-6900 Lugano, Switzerland • Tel +41+91.9242485 • Fax +41+91.9242489

geo@tenax.net

TENAX SpA - Geosynthetics Technical Office (GTO)
Viale Monza, 1- 20125 Milano (MI), Italy • Tel. +39 02.26113532 • Fax +39 02.28971107

gto@tenax.net

TENAX SpA • Divisione Geosintetici
Via dell'Industria, 3 • I-23897 Viganò (LC), Italia • Tel +39 039.9219307 • Fax +39 039.9219200

geo@tenax.net