CETU France. ANAS Italy. Réunion ATMB - CETU

Transcription

1 Réunion ATMB -

2 Tende Tunnel: - On the border between and - Important passage through Southern Alps - Direct link between River Po plain (Cuneo, Turin) and French Riviera (Côte d Azur) Italian Riviera (Liguria) Réunion ATMB - 2

3 Tunnel built in m long Réunion ATMB - 3

4 About m above sea level Surroundings of Italian portal Surroundings of French portal Réunion ATMB -

5 French portal Narrow (4.9 m at minimum) Low (3.9 m height gauge) Réunion ATMB - 5

6 Rather low traffic: veh/j (AADT) 5 % trucks But jams during week-ends Initially: Two-way traffic for cars Alternated one-way traffic for trucks A different operator on each side Limited co-operation between the two operators Partially different equipment on both sides Safety was not well ensured Réunion ATMB - 6

7 Improving safety of Tende tunnel: from operational measures to new tunnel 1. Improved organisation and safety of existing tunnel 2. Design of the new tunnel 3. Safety procedures 4. Current status Réunion ATMB - 7

8 Binational co-operation In 2000, and created the Inter-Governmental Commission (IGC) for the improvement of liaisons between FR & IT through Southern Alps Tende tunnel is in the IGC s scope: - 1st priority: improve safety of existing tunnel - 2nd priority: plan a new tunnel Réunion ATMB - 8

9 Binational co-operation In 2003, the IGC created the Safety Committee for the Tende tunnel (SC) with representatives of both countries from: - ministries of Transport and the Interior - prefectures - owners of the road through the tunnel - fire-brigades This enabled to progressively harmonise and improve: - safety equipment - operation - procedures Réunion ATMB - 9

10 Improved operational procedures Changes in traffic conditions were progressive (due to local reluctance because of risk of congestion) Finally: - one-way alternated traffic for all vehicles - regulated by traffic lights at portals Common procedures: - safety documentation (ref. EU Directive) - binational emergency plan - periodic exercises (2 per year) - feedback from incidents 4 firemen round the clock at French portal (later also at Italian portal during peak hours) Réunion ATMB - 10

11 Treaty between and To go further a treaty was necessary: - signed in Paris in March ratified by French and Italian parliaments - entered into force on 1st November 2008 was put in charge of: - managing the tunnel - building a new tunnel with reimbursing its part of the expenses entrusted these tasks to, the Italian national agency for highways Réunion ATMB - 11

12 The treaty led to a strong safety increase of the existing tunnel A single operator (key for safety) The tunnel has been connected to the new control centre built by in Turin round the clock surveillance and monitoring All equipment has been harmonised, and is maintained and activated in the same way A Safety Officer has been appointed (as defined in European Directive 2004/54/EC) Réunion ATMB - 12

13 However, the existing tunnel still has important drawbacks Narrow cross-section Low height gauge resulting in low capacity (alternated traffic) No emergency exit over 3200 m resulting in insufficient safety (partly compensated by firemen at portals) Réunion ATMB - 13

14 Improving safety of Tende tunnel: from operational measures to new tunnel 1. Improved organisation and safety of existing tunnel 2. Design of the new tunnel 3. Safety procedures 4. Current status Réunion ATMB - 14

15 The aim: 2 tubes with no height / width restriction and standard safety level Réunion ATMB - 15

16 In each tube - a single traffic lane (3.50 m) - an emergency lane (2.70 m) Réunion ATMB - 16

17 Improve the access roads on both sides Italian side Réunion ATMB - French side 17

18 Two phases for the tunnel construction 1) Bore a new tube (traffic left in the existing one) 2) Enlarge the existing tunnel (all traffic in the new tube) Before finally having one-way traffic in each tube Difficulties to keep traffic during works (tunnel construction + improvement of access roads) Temporary roads / structures Alternated traffic at certain periods Réunion ATMB - 18

19 A complex geological / technical environment - Including anhydrite on the French side (risk of swelling) - -Difficulty to enlarge an old, partly mansonry tunnel Bron, 3 septembre 2012 Réunion ATMB 19

20 After the works Studies of the French portals Before the works Réunion ATMB - After the works

21 Before the works Studies of the Italian portals After the works Réunion ATMB -

22 Tunnel equipment - Ventilation - Fire detection - Lighting - Fire hydrants - Signage - CCTV - Drainage of dangerous liquids Réunion ATMB - - Emergency phones - Fire extinguishers - Radio rebroadcast - Barriers at portals

23 Safety at each construction phase Phase 1 Boring the new tube Réunion ATMB - Phase 2 Widening the existing tube 23

24 Opening cross-connections as the new tube is bored (with procedures in case of evacuation during works) Réunion ATMB - 24

25 Improving safety of Tende tunnel: from operational measures to new tunnel 1. Improved organisation and safety of existing tunnel 2. Design of the new tunnel 3. Safety procedures 4. Current status Réunion ATMB - 25

26 Approval of design and monitoring of construction Technical Commission chaired by FR / IT technical bodies (1 year each) - monitors design and construction - examines technical and financial aspects Safety Committee chaired by FR / IT ministry members (1 year each) - gives opinion on safety documentation and all safety matters Inter-Governmental Commission chaired by high level FR / IT officials (1 year each) - approves design, commissioning, Réunion ATMB - financial balance, etc. 26

27 Ensuring safety Reference texts - Paris treaty between and - EU Directive 2004/54/EC - FR and IT national texts Administrative authority = Inter-Governmental Commission (after opinion given by the Safety Committee) Safety Officer - Appointed by (according to EU Directive) - Gives an opinion on safety documentation, incidents, training, etc. Réunion ATMB - 27

28 Successive safety documentations SD 1 (operation of current tunnel): approved by IGC, covers current situation SD 2 (new tunnel at design stage): approved by IGC before final design approval Before each construction phase starts: SD 3: Commissioning of Phase 1 (new tube construction) Design of Phases 2 and 3 SD 4: Commissioning of Phase 2 (existing tube widening) Design of Phase 3 Before final opening: SD 5: Commissioning of Phase 3 (2 unidirectional tubes) Réunion ATMB - 28

29 Operational means / measures * Traffic forecast Dangerous goods risk analysis Emergency response plan * SAFETY DOCUMENTATION Specific hazard investigation Report/analyses on incidents ** Any other risk analysis Réunion ATMB - System of permanent feedback * Operational safety measures Demonstration of safety level Tunnel description List/analysis of exercices ** Opinion of external expert * From commissioning stage ** Once tunnel in operation 29

30 Risk analyses: Specific hazard investigation According to French regulations (cf. Guide) Typical fire scenarios Réunion ATMB - 30

31 Risk analyses: Specific hazard investigation Use of 1-D CFD model Réunion ATMB - - Movements of heat and toxic gases - Users egress - Doses received by users (heat and toxic gases) - Estimation of human consequences 31

32 Risk analyses: F-N curve (according to Italian legislation) Phase 1 (current tunnel) - Compare non complying existing tunnel with reference complying tunnel - Risk is admissible because in ALARP zone Réunion ATMB - 32

33 Risk analyses: F-N curve (according to Italian legislation) Phase 2 (construction of new tunnel) - Compare non complying situation with reference complying tunnel - Risk is lower than in Phase 1 and admissible Réunion ATMB - 33

34 Improving safety of Tende tunnel: from operational measures to new tunnel 1. Improved organisation and safety of existing tunnel 2. Design of the new tunnel 3. Safety procedures 4. Current status Réunion ATMB - 34

35 Call for bids and start of works The call for bid included (among others): - Safety and co-ordination plan - Safety Documentation (SD 2) - «Essential data on safety» In case of changes regarding safety: - Demonstrate that safety level is not decreased Call for bid in , contract now signed Works to start at the end of 2012: - Phase 1 (new bore): 4 years - Phase 2 (widening existing tunnel): 3 years - Final opening (2 unidirectional tubes): 2020 Réunion ATMB - 35

36 Conclusions Improving safety of the Tende tunnel was a long process: - 12 years ( ) to achieve a reasonable safety level in the existing tunnel - another 8 years ( ) to build a new twin-bore tunnel (standards compliant) The most important and long part was to establish good co-operation between the relevant bodies of the two countries (road owners and operators but also prefectures, fire-brigades, police, etc.) Réunion ATMB - 36

37 Conclusions The most significant step was to establish a unique operator for the whole tunnel: - to operate the existing tunnel - to build and operate the new tunnel (this required a treaty between the 2 countries) Excellent co-operation between and made it possible to reach a reasonable safety level in the existing tunnel But a new tunnel was necessary to reach «normal» safety level and sufficient capacity Réunion ATMB - 37

38 Thank you for your attention! Gracias por su atención! Réunion ATMB -