We are pleased to present to you the GeoResources Journal issue 3-2015.
In 2008, Germany and Denmark signed a state treaty for the construction of a Fehmarnbelt tunnel with connecting rail and road links. Following several years of planning, the approval procedures are now drawing to a close. The Fehmarnbelt Tunnel will close the final gap between Scandinavia and Continental Europe.
Tunnelling • Major projects • Denmark • Germany • Infrastructure
Creative geotechnical Solutions for Renovating the Dresden Old Masters Picture Gallery in the Zwinger
Part 2: Injections for Enlarging a Tunnel
Annett Geppert, Jens Jähnig and Götz Tintelnot
Renovating the Old Masters Picture Gallery in the east wing of the Dresden Zwinger is also challenging in geotechnical terms. Part 2 of this report deals with injections required for ground consolidation for a tunnel enlargement. The tunnel is intended to serve as an underground passage for visitors entering the Picture Gallery. The tricky subsoil, conservation, ongoing activities in the museum and existing lines and cables represented the challenges to be faced.
The 57 km long Gotthard Base Tunnel was produced in five contract sections with three intermediate points of attack. The Sedrun intermediate point of attack consists of two blind shafts some 820 m deep, which could only be reached via a roughly one kilometre long access tunnel. The complex, tricky general conditions and the high demands placed on the availability of the shaft hoisting system were and still are a particular challenge for building and operating the facilities. This report in Part 1 deals with constructing and operating the shaft hoisting system in the form of a rock, material and manriding shaft and installations to cool the air in the Faido tunnel section during the excavation phase. Part 2 examines the dismantling and modification of the shafts and the functions of the ultimate hoisting facilities in the Sedrun shafts during the rail tunnel’s operational phase.
Moritz Schöneshöfer and Thomas Albrecht
The Gotthard Base Tunnel’s Sedrun intermediate point of attack with its two blind shafts represents a logistical and technical challenge. This report describes how two interesting parts of the contract for Shaft I were tackled. In order to avoid an air short circuit, Sedrun Shaft I was provided with a hydraulically operated, two-part closing flap with apertures for the two guide sections at the shaft head. The particular challenge in developing the closing flap related to its required tightness or rather the maximum permitted leakage volume. The two steel guide sections posed special problems for
planning, manufacturing and assembly. The anchor brackets had to comply with the static and structural requirements and provide a manageable guide length for standardizing assembly procedures. The further requirements atypical of mining for the two guide rail sections related to the temperature-related clearance between the individual guides, which had to be absolutely complied with given climatic marginal conditions with fluctuations in temperature varying from + 40°C in summer to – 20°C in winter.
Mining and Tunnelling
Chain conveyors represent essential factors for mining mineral raw materials underground or transporting spoil in tunnelling. The Halbach & Braun Industrieanlagen GmbH has devised an innovative sprocket with replaceable toothed strips for such chain conveyors thus contributing to improved efficiency and reduced costs. This new development has been applied successfully in practice in a Chinese coal mine.
Mining - Product Presentation
Ever higher requirements from mine operators have led to numerous significant developments in longwall mining technology over the past decades. Mining companies are looking for higher productivity, longer lifetime of the equipment, higher degree of automation, full system solutions, increased safety, and equipment suitable for ultra-high or low seam applications. Being in the longwall business for more than 70 years, Caterpillar Global Mining and its predecessors have invented state-of-the-art solutions over and over again to meet those challenging demands with the overall goal of minimizing the operational costs for the operators.
Mining - Product Presentation
Injection Resin System passes Fire Test for Approval according to Mining Ordinance Health Provisions
Wolfgang Salatino and Jürgen Pohle
Dywidag Systems International GmbH (DSI) has added a injection resin to its range of products. The injection resin recently passed the fire test to obtain the approval according to the German Mining Ordinance Health Provisions.
Cover Photo: B+W Gesellschaft für Innovative Produkte mbH, Bottrop, Germany, provides air cannons for activating material in silos and bunkers as well as a water mist system for combatting dust in addition to conveyor belt scrapers for mining and tunnel projects.
The company plans, builds and assembles these products in keeping with the customer’s wishes. The photo shows the water mist system at a conveyor belt transfer point for tunnel muck. The system operates in a straightforward and reliable manner and is suitable for mining and tunnelling thanks to its robust design. It is promoted by the raw materials and chemical industry (BG RCI) and widely used in the bulk materials handling industry. Optimal dedusting is carried out for example at crushers, screening units, conveyor belt transfer points etc. Thanks to the applied control unit the water mist system can be completely integrated in the system process on a fully automatic basis. Contact: www.buwip.de
The next Issue will be in the German language and is coming very soon...