Tenders Are Invited For Engineering Works And Construction Works – Sr-Vp 400Kv Rock Tunnel Excavation And Co ... in Finland

Work Detail

Engineering Works And Construction Works – Sr-Vp 400Kv Rock Tunnel Excavation And Construction Contract, Helen Sähköverkko Oy. The Object Of The Procurement Is The Rock Tunnel Of Helen Sähköverkko Oy (Client) For The Electric Cable Route From Helsinkis Sörnäis To Old Town. A 400 Kilovolt Cable Connection Is Planned To Be Placed In The Rock Tunnel. The 400 Kv Cable Connection Will Be Built As A Separate Contract After The Excavation And Construction Of This Rock Tunnel. The Planned Length Of The Rock Tunnel Is Approximately 4.2 Km. The Cross-Sectional Area Of ​​The Rock Tunnel Is About 25 M2 And It Mainly Runs At A Depth Of 20...-53 Above Sea Level. In The Vicinity Of The Kalliotunnel, There Are Other Underground Facilities, Including The Tunnels Of Hsy (Helsinki Regions Environmental Services Municipal Corporation). Vertical Shafts Will Be Built At The Northern And Southern Ends Of The Rock Tunnel, From Which The Cable Connection Will Rise To The Ground. In Old Town, The Vertical Shaft Is Located In The Area Of ​​A Rock That Is Well Above The Surface. At The End Of Sörnäinen, The Vertical Shaft Is Located In The Hanasaari Energy Quarter Area. According To Preliminary Data, The Soil Layer On Top Of The Rock Is About 20 Meters Thick And Consists Of Seabed Filled In The 1950S. There Are Also Contaminated Soil Materials (Pima) In The Area Of ​​The Hanasaari Energy Quarter. The Excavation Of The Rock Tunnel Takes Place Through Two Existing Driving Tunnels. Five Pumping Stations Are Initially Planned For The Kalliotunnel, Some Of Which Will Possibly Be Implemented Using Borehole Technology That Can Be Serviced From Above Ground. The Goal Is To Make The Rock Tunnel As Maintenance-Free As Possible, And In The Final Situation, Only Necessary Building Technology Is Planned To Be Installed There. This Purchase Includes, Among Other Things: - Construction Of The Sörnäinen Vertical Shaft Up To The Ground Level In The Scope According To The Plans, Including, Among Other Things, Excavation, Temporary And Final Retaining Wall Structure On The Ground Floor Section, And Final Shaft Structures - Construction Of The Vertical Shaft In The Old Town In The Planned Scope, Including, Among Other Things, Excavation, Temporary And Final Retaining Wall Structure On The Ground Floor Section, As Well As Final Shaft Structures And Above-Ground Shaft Building Without Building Technology - Modifications To The Existing Driving Tunnels And The Shaft Structures That Serve Them To The Extent Required By The Plans, As Well As Possible Modifications Due To The Contractors Needs - Excavation, Strengthening And Injection Works Of The Kalliotunnel, And Shotcrete Works - Structures And Equipment Of The Pumping Stations Of The Kalliotunnel, As Well As The Boreholes And Above-Ground Structures Required For The Boreholes - Other Structures And Equipment Of The Kalliotunnel In The Scope According To The Plans - Final Structures Earthing System - Drainage Systems And Foundation Structures For The Rock Tunnel - Necessary Building Technology Installations For The Rock Tunnel In The Scope According To The Plans - 400 Kv Cable Fastening System In The Scope According To The Plans, Including The Sensors And Rock Anchors Of The Fastening System - Work-Time Electrification, Lighting, Ventilation And Pumping Systems (These Will Remain For The Customer To Use Later

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