The Austrian road safety legislation requires formal approval of new tunnels as well as tunnel rehabilitation projects by the ministry of transport, infrastructure and technology.
Approval is required for the basic design (STSG §7) as well as the final design prior to commissioning (STSG §8).
In this regard and on behalf of the ministry, Lombardi SA has been mandated to establish safety expertises regarding the following tunnel objects:
- Tunnel chain Klaus
- Kaisermühlen Tunnel
- Liefering Tunnel
|Agua Negra Tunnel||References_187|
The Agua Negra tunnel is the main component of the "Bioceanic Corridor", an international project aimed to set an efficient roadway crossing through the Andes Cordillera, connecting Porto Coquimbo (Chile) to Porto Alegre (Brazil).
The project includes the construction of a 13.9 km long twin tunnel, linking the two portals at 4'080 m a.s.l. (Argentina) and 3'605 m a.s.l. (Chile). The tunnel is provided with cross passages every 250 m, two ventilation caverns (one provided with a vertical ventilation shaft of 500 m, the other with a 4.5 km long ventilation tunnel). The project includes also the ramps and the control building. The cross section is horse-shoe shaped and the carriage way is two lane wide, with a free section 7.50 m wide and 4.80 m high. There are walk ways on both sides. According to the concept for a longitudinal ventilation, the tunnel is not provided with an intermediate slab.
The construction concept is to excavate the tunnel from both portals, with two contemporary and independent excavation faces each. The excavation will be drill & blast in order to assure the maximum adaptability to the geological conditions.
Particular aspects of the project are the high elevation of the portals, the distance to the nearest urban center (>200 km), the extreme meteorological conditions in terms of wind and thermal excursion and the high seismic risk.
Lombardi is responsible of the new conceptual study, the preliminary project and the technical tender documentations for the underground and external civil works as well as for the electromechanical equipment.
|Melide-Grancia Tunnel rehabilitation with relining||References_6826|
The Melide-Grancia road tunnel, a duble tube having in average 1730 m lenght and, for each tube, one roadway and one overtaking way, is placed on A2 between the dam-bridge of Melide and the interchange "Grancia-Lugano Sud".
The two tubes are connected by 7 transversal passages. The two power-houses MGN and MGS, and the vertical shafts inside of some transversal connections give adit to the technical tunnel emplaced 5 m below the roadways, on the middle axis between the two tubes.
The aim of de rehabilitation project consisted in the structural adequation with the actual security standards, and to allow his preservation for the next decades.
The tunnel ventilation system has been midified by the existing intermediate slab removal. All the existing infrastructures inside the ventlation canals have been relocated in the new technical tunnel.
The tunnel profile has been cured by performing hydrogel grouting in order to reduce the water leakages. The concrete lining surface and the construction joints have been restored. A new drainage system has been realised with holes drilled on the joints, linked to a longitudinal collector integrated in the roadside. The power-hauses structure has been furthermore completely renewed because of the new technical requirements.
The tunnel is located on a highway stretch - the one between Lugano and Chiasso - among the more overtravelled of Switzerland. In order to reduce the road conditions inconvenients, the works have been realised night-time, allowing the circulation ever in both the directions.
|New Axen Road N4||References_110|
In the course of the completion of the national road network, the missing link between Ingenbohl and Gumpisch along Urner Lake will have to be realized.
The core of the N4 New Axen Road consists of the bi-directional two-track Sisikon and Morschach Tunnels. The Morschach Tunnel is approx. 2.9 km long and is excavated by drill-and-blast from Ingenbohl. The Sisikon Tunnel is approx. 4.4 km long and is, due to the space restrictions in both portal areas, mostly excavated by drill-and-blast from the access at Dorni.
The tunnels are mostly driven through stable lime rock formations, structurally more unfavorable conditions with Palfris marl are expected only in the region of the Riemenstald Valley. Ventilation stations will be built on each portal.
Lombardi Ltd. is working for this project in a consortium called “INGE Axen”.
The services include the sections tunnel construction as well as the technical overall direction of the project with the following scope of performance:
- Technical coordination between the planners and the specialists;
- Design of the main project, detailed project and preparation of the bidding
- Preparation of documents for the implementation;
- Site supervision.
Commissioned in 1974, the Vennes-Chexbres section of the N09 highway is subject to major maintenance works. In addition, to overcome the difficulties caused by the traffic overload of the section, it is planned to implement a dynamic lane that enables to use the emergency lane as a temporary traffic lane during the high traffic load periods (temporary PUN) between the junctions of Vennes and Belmont.
Lombardi SA, leader of the LIG-A JV, oversees the project management and most of the tunnel- and geotechnical studies.
The Belmont tunnel, double tube with one-way traffic (L=about 350 m), will be extended with the help of a protective cover that guarantees a separation of the construction area from the traffic space along its entire length, thus maintaining 2 lanes with reduced width (2x3.50 m) during the enlargement of the tunnel.
The construction method chosen and adapted for the Belmont tunnel is pioneering in Switzerland and represents a significant technical challenge, but also a great opportunity for the other numerous Swiss tunnels that in the coming years will have to be repaired or enlarged under traffic.
All works will be carried out under traffic (DMT of 65,000 vehicles/day) with the upkeep of the 4 lanes at peak times. This traffic management and the implementation of the PUN are associated with important civil works, including the enlargement of the Belmont tunnel and the expansion and strengthening of other structures in the section.
|Seelisberg Tunnel - Hauptinspektionen||References_930|
The Seelisberg tunnel is a 9’250 m long, double-tube and double-lane road tunnel on the highway N02, connecting Beckenried (NW) with Seedorf (UR). It is the second-longest tunnel between Basel and Chiasso after the Gotthard Road Tunnel.
There are cross-passages between the tubes every 300 meters. The tunnel system also comprises the two ventilation stations Rütenen and Büel at the south portal as well as the underground ventilation station Hattig with a vertical shaft and outdoor installations.
The assignment comprises the quinquennial main inspections of the tunnel (2013/2018) and the auxiliary structures (2014/2019) as well as several intermittent inspections with the following work packages:
Main inspection with visual check, evaluation and assessment of all the 43 components.
Intermittent inspections of single, regularly to be tested structural parts as well as their evaluation and assessment.
Evaluation and assessment of the monitoring measurements in the contract section Huttegg (segment deformation) and in the Amdenmergel segment of the contract section Rütenen (swelling-induced heaves).
The objectives of the condition examination are:
Preservation of a sufficient structural and operational safety,
Ensuring the suitability for use,
Awareness and accountability of the owner,
Documentation of the structural condition and its transformation.
|San Bernardino Tunnel - Ventilation||References_5383|
The San Bernardino tunnel is divided in three ventilation sections (north, center, south). It is ventilated by means of four ventilation stations (North, Aria, Sasso and South). The ventilation system, originating in the sixties, has been partially renewed from 2001 to 2007.
In the years to come, at first the ventilation shaft Aria needs rehabilitation, and thereafter the ventilation shaft Sasso needs partial rehabilitation. Measures will be taken in the ventilation system to ensure the safety during the rehabilitation work, more specifically:
- The substitution of the axial exhaust air fans in the stations North, Aria, Sasso
- The addition of an axial air fan in place of the fresh air fan which has already
been removed from the stations North and South, respectively;
- The installation of compartmentation dampers into the exhaust air channel in
order to create a redundancy between the fans;
- The substitution of 12 jet fans;
- The renouncement of the fresh air supply fan (substitution with additional
safety gallery fans) in the Aria and Sasso stations;
- The replacement and doubling of the safety gallery overpressure fans in
order to create the necessary redundancy during the rehabilitation phase of
the shafts in the Aria and Sasso stations;
- The substitution and the adding of measuring sensors.
No interventions are planned at the exhaust dampers which will be retained. In the context of control, it is planned to replace the local control cabinets for the longitudinal ventilation, the exhaust air and the safety gallery fans. The SCADA will be kept and updated in order to integrate the additional fans/dampers.
|St. Gotthard Road Tunnel - Second Tube||References_133|
The existing Gotthard road tunnel with a length of 16.9 km ensures the crossing of the Swiss Alps via highway N02 between the municipalities of Göschenen in the north and Airolo in the south since 1980. This highway represents an important link between northern and southern Europe.
In order to avoid the interruption of this important connection, the Swiss Federal Council has proposed the construction of a second tube and, after transferring the traffic into the new tube, to rehabilitate the first tube. This version should be implemented without generating an increase in traffic capacity: after the rehabilitation, both tubes are to be operated single-lane with hard shoulder.
The ultimate objective of the construction of a second tube as part of the overall rehabilitation of the Gotthard road tunnel is to increase traffic safety by means of directionally separated tunnels and transportation to create network redundancy in the event of maintenance and incident.
The Federal Roads Office (FEDRO) has assigned Lombardi Ltd., in JV with Ernst Basler + Partner AG under the name of IG CIELO+, as owner's support engineers.
In their capacity of support to the overall project management and coordinator of the JV, Lombardi's main activities were the following:
Technical support of the project by specialists in the fields of underground structures, ventilation and safety of tunnels, active support of the overall project management with the coordination, development and planning of the project, co-advisor for the assessment of third-party files and documents.