Railway tunnels

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New Albula Tunnel II - Lot 105, Consolidation Raibler CornieuleReferences_1842
The 5‘864 m long Albula Tunnel (I) is situated on the railway line Chur-Thusis-St. Moritz and was put into operation in 1903. The new Albula Tunnel II is being constructed parallel to the existing Albula Tunnel with an axial distance of 30 m. When constructing the first Albula Tunnel I, the aquiferous zone of the so-called Raibler-Formation (cell dolomite rock) already revealed to be a geologically difficult zone. In 2013, starting from a specially excavated cavern connected to the existing tunnel, exploration drillings have been done in the whole Raibler-Formation zone in order to develop a more accurate geological model. The cavern, situated in the axis of the Albula Tunnel II, is only accessible through a cross passage from the Albula Tunnel I. Following the drillings results, the Raibler-Formation can be subdivided in three different geological sectors. The sector denominated III is a fault zone of silty fine sand (swimming Raibler-Formation) with a water pressure of approximately 5 bar. For safety reason the sector III will be excavated with the freezing method. Before starting the excavation the ice casing will have to be built. This will perform a temporary support against rock and groundwater pressure and furthermore ensure the sector’s impermeability during construction time. Apart from the drillings for the construction of the ice casing, control drillings to monitor the ice casing’s impermeability and injection and drainage drillings to reduce the amount of water, will be necessary. The ice casing will be retained until the termination of the excavation and inner lining in sector III.
Switzerland
Turin-Ceres - Connection of the line with the RFI network - EquipmentReferences_2529
The connection of the Turin-Ceres railway (Gruppo Torinese Trasporti) with the Turin railway network (Rete Ferroviaria Italiana) represents important underground works of approximately 4.2 km including the realization of a new twin-track tunnel along Largo Grosseto, the completion of Rebaudengo Station and the adaption of an existing twin-track tunnel section. In addition to the structural design, Lombardi has developed the detailed design of the necessary electromechanical equipment to ensure the safety of users and the functionality of the railway’s operation. The design of Grosseto Station has been developed using Building Information Modelling (BIM) which allowed an efficient interaction between the different design disciplines, obtaining a high-quality result. The electromechanical system, designed with respect to the safety requirements of the Ministerial Decree 28.10.2005 “Safety of railway tunnels”, includes the medium and low voltage power supply, the normal and emergency lighting system, a complex ventilation and fumes control system for the underground stations, the pressurization system of the emergency exits, the fire detection system, the water distribution networks for the hydrants and the automatic high pressure sprinkler extinguishing system, the ventilation and air-conditioning of the technical rooms, the video surveillance as well as the intrusion protection and monitoring systems.
Italy
Brenner Base TunnelReferences_2308
The BBT consists of two single-track tunnels at a distance of approx. 70 m. The Tunnels are connected by cross-passages at intervals of 333 m. The cross-passages serve as escape routes in case of an emergency. A distinctive feature of the base tunnel is the exploratory tunnel; it lies at a depth of approx. 12 m below and between the two main tunnels with a diameter ranging from 6 to 8 m. The excavation of the exploratory tunnel will help determine the exact geological nature of the rock and therefore minimize the excavation cost and time of the main tunnels. After completion of the main tunnels, the exploratory tunnel will be used as a service and drainage tunnel. Upon completion of the BBT, the tunnel will have a total length of 64 km and be the world’s longest underground railway connection. In Innsbruck, the tunnel connects to the current bypass, which leads into the Unterinntalstrasse in Tulfes. Parallel to the bypass there will be an emergency tunnel/gallery. The two main tunnels between Innsbruck and Franzenfeste are 55 km long. The gradient of the base tunnel is 6.7‰ on the north side and 4.0‰ on the south side. Lombardi Ltd., together with partners of the joint venture BBT north, was assigned the planning, tendering, design details and geotechnical supervision of the construction lots H21 (Sillschlucht), H41 (Sillschlucht-Pfons) and H51 (Pfons-Brenner). Lombardi Ltd. is responsible for the planning of the excavation.
Austria/Italy
Turin-Ceres - Connection of the line with the RFI network - Risk AnalysisReferences_2541
The connection of the Turin-Ceres railway (Gruppo Torinese Trasporti) with the Turin railway network (Rete Ferroviaria Italiana) represents important underground works of approximately 4.2 km, involving the entire Turin Railway Node. The critical issues related to the interconnection of two different railway systems required the elaboration of an extensive risk analyses, consistent with the requirements indicated by D.M. 28.10.2005 “Safety in railway tunnels”. The analysis includes the verification of compliance with the safety requirements, the determination of the expected risk level for the three events envisaged by the D.M./2005 (derailment, collision, fire), an estimate of possible additional measures which may be necessary to achieve the objectives and an assessment of these measures through a cost-benefit balance. For the case of fire, numerous 3D fluid dynamics simulations of smoke and heat propagation and specific escape models in the different scenarios, established according to “logical tree” structures on several levels and necessary to estimate the probability of occurrence of each event, have been developed. The elaboration of the analysis allowed to verify that the expected risk level, calculated for the infrastructure in question, can be reduced through the adoption of supplementary measures, determining which of them are reasonably practicable.
Italy
Line 150, Lausanne - GenevaReferences_6011
The studies conducted in the framework of Rail 2030 and the long-term development of the Geneva node (master plan Horizon 2050) have highlighted the need to build two further tracks at Geneva main station by 2025. Since 2011, several preliminary studies have been conducted to increase the service while respecting the established financial budget. The preliminary study called “EP 2015” is the basic scenario for the preliminary design studies to be undertaken. The framework agreement underlying the extension of the Geneva underground station was signed on December 7th, 2015. The Confederation, the Canton of Geneva and the Municipality of Geneva will invest over 1.6 billion Francs in the underground expansion of Cornavin station. The selected project involves the construction of two underground tracks and a platform. The trains will access the new tracks via a double-track tunnel on the Lausanne side and a single-track tunnel on the Airport side. Lombardi Engineering Ltd., leader of the JV G3, together with its partners, is responsible for the preliminary design (phase 31) of the double-track access on the Lausanne side for civil works (access ramp section: 246 m, section in cut & cover 184 m, tunnel 1’003 m, section in cut & cover in the connection area to the station 296 m, total 1’729 m) and optionally for all the subsequent phases (from 32 to 53, design, project management, commissioning). The coordination between civil engineering and railway technology is also included in the mandate. The execution of the works is planned under full train operation. The underground structures will be excavated in clay (alluvial materials) and in the moraine, partially in the Rhône aquifer, in difficult geotechnical and geomechanical conditions.
Switzerland
Koralm TunnelReferences_167
The Koralm line represents the extension of the trans-European corridor in the border region with Italy and is part of the axis that from Danzica, through Warsaw, Vienna, Trieste and Venice leads to Bologna, connecting in this way the Baltic sea with the Mediterranean sea. The regional links between Styria and Carinthia are sensitively improved allowing an optimal connection with the main towns of Graz and Klagenfurt. Technical difficulties: Excavation with TBM and segmental lining in crystalline rock with coverage up to 1'250 m as well as in sedimentary rocks and in loose permeable material; Crossing of various technically difficult regions due to crystalline rocks and fault zones. Furthermore, a large fault zone is located in the Lavanttal (Carinthia section) between the tertiary and the crystalline rock; Complex logistic conditions for the provisioning and the disposal by means of galleries (up to 17 km of length). Methods and construction schedules: 2/3 of the tunnel in mechanized excavation using 3 TBMs; 1/3 of the tunnel with traditional excavation, of which 50% with amplification of the exploratory gallery; Styria: 2 x Double-Shield Hardrock-TBMs (in the crystalline rock section), precast segmental lining, length ca. 2x17 km, diameter 9,90 m, currently under construction; Carinthia: shielded TBM with earth pressure, subsequently adapted for advancement in crystalline hard rock, precast segmental lining, length ca. 2 x 10 km, diameter ca. 9,90m; Construction period: scheduled from 2009 to 2022.
Austria
RhB Val Varuna Tunnel - Experts mandateReferences_7189
The Val Varuna Tunnel I of the Rhaetian Railway is located on the St. Moritz – Tirano route, about 2.7 km after the Cavaglia station. It has a total length of 148 m and was put into operation in 1908. The standard section consists of a horseshoe profile with a total height of 4.62 m. The tunnel is currently assigned to the state class 4 (status report 2015). In the context of the tunnel renewal strategy, the tunnel is to be overhauled in the years 2020 to 2022 according to the "Standard Construction Tunnel BA". The newly developed "Standard Construction Tunnel BA" stipulates that the existing tunnel portals are dismantled, the tunnel is expanded, and a new tunnel is reconstructed on the same route during night breaks. For logistical reasons, the "Standard Construction Tunnel BA" refrains from the application of prefabricated concrete elements for the lining, using shotcrete shells with a seal instead. The expertise performed by Lombardi AG is safety-oriented. The documents were verified for plausibility and analogy to the specifications of the newly developed "Standard Construction Tunnel BA" as well as to the Mistail and Sasslatsch tunnel projects, which were built in accordance with the "old" standard construction method and supervised by us as experts. The expertise was performed in such a way that deviations from the regulations and standards as well as design and execution errors, which lead to a deterioration in safety or suitability, are detected. The expertise covered the structural measures (department Structural Engineering of "RL UP-EB", (Directive for the independent inspection bodies of the railways) for the overhauling of the Val Veruna Tunnel I. It includes the construction and operating status of the tunnel system and the portals.
Switzerland
ATG - Gotthard Base Tunnel - Principal EquipmentReferences_139
The Gotthard Base Tunnel consists of two single track tubes with a length of 57 km between Erstfeld and Bodio. At a regular distance of about 325 m cross passages, for evacuation in case of an emergency and installation of the electrical equipment, connect the main tubes. Our mandate comprises the final design, the tendering procedure for the equipment of 175 cross passages, including fire safety installations doors, technical floors and ventilation units. Two multifunctional stations, located at the bottom of the vertical shaft in Sedrun and of the inclined intermediate access in Faido, are equipped with ventilation plants, which ensure passenger safety in case of an emergency stop of the train. Several technical rooms, which accommodate the main electromechanical systems, are located there. Lombardi was commissioned with the equipment and the ventilation of the mentioned technical rooms, the hoisting equipment of the 800 m deep vertical shaft and for the underground buildings as well as with the complete ventilation of the entire tunnel system, including smoke evacuation system. The commission includes the required elements for all water supply and water drainage plants. In order to face the elevated demands of the project without complications, a proper direct coordination between the different activities of the designers for the installations of the railway technology were requested by the client. For this reason, complex coordination documents have been elaborated, with support of an in-house developed database, which comprise all the locations to be managed.
Switzerland
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