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GROUND FREEZING

GROUND FREEZING

GROUND FREEZING

The ground freezing technique aims at allowing the execution of underground works when the presence of groundwater, and therefore the subsequent instability of soil or strong water inflow, make it difficult to work there.

The controlled lowering of temperature down to freezing point reduces or temporarily annul soil permeability, increasing its stability, and also increases the strength of soil.

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This method is used for drilling wells, building tunnel headings, barrages and walls. In the area to be treated, freeze pipes are placed at a fixed distance between centres to allow a reciprocal interpenetration of columns and, subsequently, create a continuous frozen wall. The temperature of soil is conventionally and safely lowered, until it reaches a value of at least -10° C at a distance of 50 cm from the core of the pipe, and is then kept at that value for the whole working period.

The freezing process is carried out using cooling systems which allows the continuous circulation of calcium chloride at -35° C in appropriate tubes preinstalled in the ground. Alternatively, liquid nitrogen is injected in the tubes and then exhausted to atmosphere in gaseous form. The extremely low temperature (-190°) causes a quick and efficient freezing, and this condition is then maintained by means of refrigeration systems. Generally, this latter method is only used for short periods or for the sole cooling activation.

Working sheets

14561
All / Italy / France

9961 – Naples Metro – Line 6 (Italy)

1384 – Clichy Saint-Ouen – Parigi (France)

1319 – Porte de Clichy – Paris (France)

This post is also available in: French Italian

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    Via Silvio Pellico, 2
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  • Fully paid share capital. 25.000.000,00
    Tax code and VAT 00298880303
    Business register of Udine 00298880303
    Economic and administrative repertory n. 131947 Udine
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