Tenders Are Invited For River Regulation And Flood Control Works - Repair Of The Existing Correction Of The Vladaiska River From Damianitsa St. To Belotok St., Vitosha District

River Regulation And Flood Control Works - Repair Of The Existing Correction Of The Vladaiska River From Damianitsa St. To Belotok St., Vitosha District. The Existing Correction Of The Vladaiska River Planned For Repair Is About 140 M Long And Falls Entirely On The Territory Of The Vitosha District - Between Damyanitsa Street And Belotok Street. The Activities Related To The Repair Works And Improvement Of The Surrounding Space Include: • Restoration And Improvement Of The Technical And Operational Condition Of The Lining Of The River Bed, As The Existing Trapezoidal Section And Triangular Bottom Of The River Bed Are Not Changed. During The Renovation Works, The Bottom Will Be Filled With Reinforced Concrete And Stone Lining. • Construction Of A Safety Railing, Parallel To The Left Retaining Wall Of The River Bed; • Removal Of Existing Vegetation And Improvement Of The Surrounding Area. A Complete Repair Of The Culvert Is Planned, With 1.5 M Of Stone Left On Both Sides, And A Newly Designed Reinforced Concrete (According To The Existing Situation) For The Remaining Part. Dismantled Stones From The Wedge Will Be Used To Restore The Missing Stone Cladding On The Walls And Wedge Of The Correction. The Bottom Of The Trough (The Trough) Is Designed With A Triangular Geometric Shape And Variable Thickness From 30 To 50 Cm. It Will Be Built On A 10 Cm C10/12 Concrete Pad And A 20 Cm Ballast Cushion. It Is Particularly Important When Laying The Underlying Concrete To Achieve A Strong Layer. The Excavation Is Accepted By A Designer, Constructor And Geologist. The Wedge Will Be Reinforced With Steel Ribbed Bars N10 Of Reinforcing Steel Class B500b. Structural Concrete Is C30/37 Of Environmental Impact Class Xf4 And Water Resistance Class Cw=0.8. For Convenience When Bridging The Strip Of 1.5 M, Filler Concrete C30/37 Is Provided, With The Same Characteristics And With A Variable Slope And Height To Achieve The Existing Levels Of The Stone Foundation. The Stone Will Be Lined And Grouted With A Strong Cement-Sand Solution. To Secure The Repaired Section, A Railing Was Designed, Immediately Next To The Correction Wall, On Single Foundations Of Dimensions 25/25/50. The Connection Between The Foundation And The Railing Will Be Made By Means Of N12 Anchors 50 Cm Long, Embedded In Pre-Drilled Holes In The Newly Designed Foundation, Which Are Filled With Epoxy. All Holes For Anchors Should Be Executed According To The Template Set In The Project. Structural Concrete For The Foundation For The Railing Is C20/25 Of Environmental Impact Class Хс1. Remedial Works On The Retaining Stone Walls Of The River Correction Will Include The Removal Of Weathered Or Extracted Mortar Between The Stones To A Solid Base, And It Is Planned To Replace It With A New One By Intensive Hammering And Pre-Grouting With Cement-Sand Mortar 1:2. After The Cutting Of Tree Vegetation, Reflected In The Landscape Architecture Part, No Local Disturbances Are Expected To Form On The Walls Of The Stone Correction. The Missing Stones In The Walls, Which Are In Separate Places, Should Be Filled With Suitable Stones Or With C30/37 Concrete. In These Areas, It Is Necessary To Bridge With Cement-Sand Ra