new Damtjønna For Malvik Municipality . Description Brief Description Of The Scope Of The Contract Workdamtjønna Is Located In Malvik Municipality, In Trøndelag County. The Measure Is Located At The Northern End Of Damtjønna. The Facility Is Located Approx. 10 Km As The Crow Flies South Of Hommelvik Centre. A New Dam Is To Be Built At Damtjønna. The Dam Is Designed As A Massive Gravity Dam In Concrete, Attached To The Rock With Rock Bolts. The Dam Must Be Established With A Flood Overflow And Draining Device. The Cart Road Into The Construction Area Will Be Upgraded To Handle The Transport Of Construction Machinery. For Crossing The Vennaelva, A Permanent Crossing Designed As Irish Crossing Will Be Established. The Massive Concrete Dam Will Have An Assumed Length Of Approx. 20 M And A Maximum Height Of 3.5 M. The Dam Will Be Vertical On The Upstream Side, And Slope On The Windward Side 1:0.5 (V:H). The Width Of The Dam Crown Is 2.0M. The Dam Must Have A 2.0 M Long Flood Spillway, With An Overflow Crown Of Hrv = 347.0. The Dam Crown For The Dam Is Placed 0.2 M Higher Than The Hrv. The Dam Is Bolted To The Rock With Rock Bolts Ø32 Mm And C/C 1000 Mm. The Bolts Are Driven 4.5 M Into The Mountain. The Dam Is Built A Few Meters Downstream Of The Existing Dam. The Existing Dam Consists Of A 25-30 Cm Thick Concrete Slab With A Reinforcing Fill On The Downstream Side Of The Slab. The Existing Pond Acts As A Catch Pond During The Works. The Uppermost Approx. 1.0 M Of The Existing Dam And Fill Must Be Demolished And Removed After The New Dam Has Been Built. The Work Can Be Briefly Divided Into The Following Main Activities: Establishment Of A Road To The Damestablishment Of A River Crossing Irish Crossingcleaning Of The Dam Foundationdrilling And Tightening Of Rock Boltstest Pulling Of Boltsinjecting Into The Dam Foundation To Seal Leaks Pouring A New Dam Downstream Of The Existing Damestablishing A Flood Channel In It The New Dam Re-Establish A Drain Through The New Dam Establish A Reserve Line For Water Supply Parallel To The Existing Main Pipe Establish And Equip A New Sump Downstream Of The New Dam Remove The Existing Sump With All Contents Connect A New Water Supply Pipe To The Existing Water Supply Pipe Remove The Top Meter Of The Existing Dam Plate Remove The Top Meter Of The Existing Support Fill Establish Security Fences On The New Dam Drive Away Demolition Materials, Provide A Suitable Landfill Rounding Off Clean Masses And Growth Layers
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