nails. The temporary micropile walls stabilized the trench for an elevator shaft and a tunnel inside the building. Over 9,000 m (29,527 ft) of hollow bar micropiles (TITAN 103/78 and 103/51) were used to stabilize dynamically active rock masses. Codes Ischebeck GmbH developed the application of hollow bars for micropiles, soil nails and roof bolts, and holds registered patents DE 3400182 and DE 38283335. Ischebeck TITAN hollow bars are marketed in North Ltd., as CTS/TITAN hollow bars. The European Union has implemented America exclusively by Con-Tech Systems, ® replacement for the original foundations in the building where a new underground floor was created and where the structure was subjected to increased loading. Nearly 15,000 m (49,212 ft) of hollow bar soil nails (TITAN 30/11 and 40/16) were installed to provide temporary and permanent excavation support for construc- tion of the new building. Over 3,850 m (12,631 ft) of hollow bar ground anchors were also installed to supplement the soil two standards that incorporate hollow bars, EN 14199: 2005 Micropiles and EN 14490: 2010 Soil Nails. TITAN is fully compliant with BS EN 14199, both in terms of tech- nology and method of micropile construc- tion including drilling with simultaneous injection, using a stay-in-place duct as rein- forcement, and material requirements such as steel grade and corrosion protection. In the U.S., the American Association of State Highway and Transportation Officials’ (AASHTO’s) recently approved micropile LRFD construction specification includes hollow bars. Recommendations are also available for hollow bars, including Hollow Bar Soil Nails Publication No. FHWA-CFL/TD-09-001 (June 2009), Ernst Ischebeck (1940-2014) Ernst Ischebeck was co-owner and long- time chief executive officer of Friedr. Ischebeck GmbH. He worked for the family business for almost 50 years. He joined the company in 1965 after completing his degree in mechanical engineering at the Technical University of Hanover. For many years, Ischebeck and his cousin Friedrich Döpp led the company, which their grandfather founded in 1881 as a tool factory and die forging business. Hollow bars for geotechnical applications fit perfectly as a fourth Ischebeck company product line, expanding the company products of formwork support systems, trench protection systems and cast items. Ischebeck was responsible for the technical management of the company and drove the development of the equipment manufacturing progress. He was a determined and creative man with a profound engineering knowledge in an array of technical fields. His ideas were instrumental in the development of the company’s production processes and his innovation is evident throughout the product range. Ischebeck maintained strong relationships with customers and suppliers while promoting the importance of new markets. In addition to his notable technical contributions, Ischebeck was a humble, friendly, courteous person who was always willing to listen and contribute his ideas. He is survived by his wife Ruth, three sons, Björn, Lars – who will guide the family business now in its fifth generation – and Jens, and daughter Britta. He was a long-time ISM supporter and member of the ISM Steering Committee since 2012. Other ISM Steering Committee members recognized Ischebeck as a “really exceptional man, so talented, wise and warm,” “exceptionally gifted,” a “gentleman who was always generous with his time and in sharing his experience,” and “a man of great intelligence, generosity and humanity…an abso- lutely unique individual.” Ischebeck was a real gem…a true gentleman…a man worthy of being recognized for the mark he made on this industry by his professionalism, integrity and character. DEEP FOUNDATIONS • NOV/DEC 2014 • 97 FHWA’s Hollow Core Soil Nails, State of Practice (April 2006), DFI’s Guide to Drafting a Micropile Specification (2004) (being updated currently), DFI’s Soil Nail Guide Specifications (2010), and the current update to FHWA’s Geotechnical Engineering Circular No. 7 Soil Nail Walls. Closing Hollow bar technology has advanced sig- nificantly since its inception 40 years ago. It has grown from a unique concept, to a pro- gressive technique implemented by pioneering engineers and contractors, to a foundation element used internationally and regulated by agencies in North America and Europe. Hollow bar elements have improved installation speed and design efficiency, lowered costs and revolutionized many standard deep foundation techniques. Hollow bars for wind turbine foundations (photo credit Ischebeck GmbH)
