The general consensus in China is that construction projects need to move away from diaphragm walls which are considered environmentally unfriendly and into temporary sheet pile walls. The construction industry has entered a sweet spot with client awareness availability of modern steel products falling steel prices as well as the introduction of resonance free hydraulic vibratory hammers by ICE all enabling this building revolution.
 
The popularization of sheet pile walls in big inner city projects was slowed by the limited excavation depths allowed by local building authorities. With the introduction of the combi walls (consisting of alternated interlocked casings and sheet piles that offer much greater vertical and horizontal load-bearing capacity) deeper excavation of temporary retaining walls is now permitted.
 
Modern interlock technology allows for excellent water tightness results and ICE resonance free vibratory hammers ensure the walls can be reliably installed in challenging soil conditions up to 60m depth and within a meter of existing structures with no vibration disturbance to the neighboring structures and minimal compaction disturbance to existing soil layers. The solution brings considerable savings in construction time and produces an end result of good overall economy.

 Retaining walls can be circular or make angles of various degrees making them suitable for construction projects in confined conditions. If necessary different pile sizes can be combined in the pile wall varying pile length and casing diameter. Thus the wall structure can be optimized according to actual loads.
 
ICE resonance free vibratory hammers have a great track record in Europe. Extensive test projects around China in recent years have established RF technology as a recognized method for the fast driving of piles with no vibration disturbance to the surroundings.