 Meanwhile, in Britain, we are one of the biggest operators in the piling market. Our services range from the long-established tripod method to the most modern continuous flight auger systems. They include small and large diameter board piles, driven piles and mini piles, which greatly ease the problems of working in cramped conditions or dealing with underground obstructions. But where Keller has brought piling up to date most of all is in the computerized monitoring and instrumentation which we developed for our auger cast system. It puts the operator in complete control and provides an immediate hard copy printout for each pile. Keller's third market is specialist grouting. Another important application is in tunneling, where one of the first tasks is often to stabilize the surrounding soil before digging. In the Los Angeles subway system, the solution was achieved through the use of chemical grouting. Another subway system in Baltimore faced the problem of ground movement beneath surrounding buildings. Compaction grouting was used to control this movement during tunnel construction. Soil creek is one. The soil is eroded by the action of a high-speed water jet, sheathed in a cone of compressed air. Simultaneously, grout is pumped into the loosened soil and surface material is removed to the surface. Thus, columns and membranes can be formed and shaped according to requirements. This way, it's possible to treat a much wider range of soil types than with conventional methods. But the most recent breakthrough is the Keller system known as soil frack. Here, grout is forced into the ground consolidating or strengthening the surrounding soil. This highly controllable technique can produce a lifting effect which can be used to correct settlement under a building. Soil creek. It's formed by eroding the ground with ultra-high-pressure water jets and simultaneously replacing the partially removed soil with the grout. Any configuration of grout columns can be formed underground and interlocked to make blocks of known size and strength. The soil creek system is offered by the group throughout the world. Here to underpin the foundations of the historic Carl's Blood in Munich. Soil creek is also used to control groundwater flows in deep excavations or dams. Keller's soil frack system is used to compensate for settlement due to ground movement. Sensors are installed to detect movement. Then grout is pumped at high pressure through a complex network of previously drilled pipes to precisely calculated points. Stabilizing the ground and compensating for any settlement as it occurs. Ground which is too weak to safely support new structures can be strengthened by using powerful depth vibrators. Invented by cannons, the process is now used extensively by the group worldwide on projects as diverse as oil refineries and houses. The vibrators are built by the company in Germany and are capable of treating soils to depths in excess of 30 meters. By contrast, some of the tallest buildings in the United States are supported by very large steel reinforced caissons or piles installed by Keller.