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Contribution by RASCOR International Ltd. The editorial team accepts no responsibility for the text content.
Revolutionary waterproofing method: Combined cement/polyurethane injections for tunnelling
The waterproofing of water-bearing areas on tunnelling contracts poses major challenges for civil engineers. Combined cement/polyurethane injections offer an innovative solution for preventing the ingress of water and material that is both cost-effective and eco-friendly.
Principle behind combined injection technology and its benefits Traditional injection methods use either cement or chemical substances to seal off flow paths. The combination of cement and polyurethane unites the advantages of both materials: cement suspension is inexpensive and provides a waterproof barrier while polyurethane is reactive, resistant to wash-out and likewise watertight. Modern equipment technology allows homogeneous mixing of the two materials for efficient use even under high water pressures.
• Enhanced stability and watertightness: The addition of polyurethane considerably improves wash-out resistance, especially in heavily water-bearing zones.
• Flexibility and adaptability: The mixing ratios can be flexibly tailored to the specific requirements of the ground, thus enabling efficient, targeted injection.
• Cost and environmental benefits: Despite the higher cost of polyurethane, the greater effectiveness and lower number of injections needed can cut the overall cost while minimizing the environmental impact.
Application examples: On a tunnel project, combined cement/polyurethane injection grouting delivered impressive results in waterproofing and stabilizing a 134 m long exploratory borehole. This was safely and effectively sealed despite a high mountain water pressure of 50 bar.
Another tunnel project made use of cement/polyurethane injections to waterproof heavily water-bearing zones. Here, the challenges posed by high flow rates and fluctuating water pressures were overcome by flexible mixing ratios and modern equip- ment technology. A stable and durable waterproof barrier was installed without any delay to the progress of the works.
To sum up:
Combined cement/polyurethane injection grouting is a forward-looking technology for use in tunnelling. It offers a robust, flexible and cost-effective solution for waterproofing and stabilizing water-bearing areas. Given the latest develop- ments in injection technology, this method is set to assume an increasingly important role in the construction industry.
Experience the next generation in injection technology!
For further details, please visit
https://sites.rascor.com/hms317 or simply call us on +41 44 857 11 11 – our sales team will be glad to assist. RASCOR International AG | CH-8162 Steinmaur | +41 44 857 11 11 |
sales@rascor.com |
www.rascor.com
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