Tenders Are Invited For Conservation Works On The Historic Marian Column On The Market Square In Olesno

1. The Subject Of The Order Is Conservation Work On The Historic Marian Column On The Market Square In Oleśno.2. Scope Of Expected Conservation And Restoration Works: I. Stone Elements (Column, Plinth And Platform With Feet, Figure Of Mary With Base): 1. Preliminary Strengthening Of Weakened Stone Fragments Using A Agent Based On Ethyl Esters Of Silicic Acid For Sandstone. The Treatment Should Be Repeated In Localized Weakened Areas, After Removing Impurities.2. An Attempt To Consolidate The Preserved Gilt Surfaces By Impregnation With Methacrylic Resin And By Injecting And Gluing Cracks And Open Delaminations With Acrylic Resin. Repeat The Treatment After Removing The Contamination.3. Removal Of Microbial Growth Combined With Disinfection With A Preparation Without Active Chlorine.4. Cleaning The Stone Surface Using The Hydrodynamic Method With Adjustable Water Pressure And Temperature. The Treatment Should Be Supported With The Use Of Surfactants, And In The Case Of Local, More Persistent Dirt, With A Slightly Acidic Preparation.5. Deepening Or Mechanical Forging - In Places Of Visible Secondary Destruction Of Putties And Joints. Blow Out Open Gaps With Compressed Air And Clean Exposed Surfaces.6. Desalting Of Stone - By The Method Of Free Migration Of Salt Into An Expanded Environment Through Paper Pulp Compresses In Demineralized Water Or Using Ready-Made Compresses With High Sorption Capacity.7. Structural Stabilization Of The Column Shaft By Filling Cracks And Scratches Using Low-Viscosity Chemical-Setting Materials. Additionally, Connections Made Of Non-Corrosive Steel Hidden In The Structure Can Be Used To Strengthen The Glued Places.8. Gluing Smaller Scratches And Cracks In The Stone Structure, Including The Places Where Preserved And Reconstructed Elements Are Joined. Application Of Liquid Resin Or Acrylic Dispersion.9. Filling And Retouching Defects In Sculptural Form And Stone Detail.10. Filling The Joints Between The Column Elements - Using Soft Mortar And Mortar For Chipped Joints Between The Steps Of The Platform.11. Preparation Of Color Combinations To Unify The Color-Differentiated Surfaces Of Restorations - Using Semi-Transparent Paints Intended For Mineral Substrates, With The Possibility Of Adjusting The Opacity.12. Priming Areas Exposed To Increased Greenery (Especially - Sculpture With Base, Column Base, Cornice And Base Of A Four-Sided Plinth, Landing Steps), Bactericidal, Fungal And Algaecide, With Preventive Creation Of Active Substance Resources.13. Protection Of Stone Surfaces By Hydrophobizing Impregnation With A Silane Solution.14. Gilding: A) Sculpture - Attributes: Corroded Dragon Wings Should Be Chemically Derusted With Phosphoric Acid Or Gently Blast Cleaned, Preferably With A Prosthetic Device With Aluminum Silicate Granules In The Range Of 25Μ - 150Μ, Active Protection Of Exposed Metal By Applying An Anti-Corrosion Preparation Containing Zinc Phosphate, Places Of Corrosion On Other Elements Should Be Uncovered, Cleaned And Protected With A Stabilizing Tannin Solution, - Applying A Layer Of Oil Coating Under The Gold - Additionally In Places Of Losses, - Applying Gold Leaf - Additionally (After In Situ Assessment), - Protecting The Surface Of The Layer With Gold, B) Stone Detail - Places Of Damage Gilding: - Appropriate Preparation Of The Base Layer - Applying Several Layers Of Methacrylic Resin To The Exposed Surfaces, Dissolved To The Appropriate Consistency In A Mixture Of Solvents; - Applying A Layer Of Oil Coating, - Applying Gold Leaf, - Protecting The Surface Of The Gilding Layer. Ii. Pedestal (Brick, Plastered): 1. Removal Of Microbial Growth Combined With Disinfection. Repeat The Procedure After Removing The Accumulated Contaminants And Chipping Away The Mortars.2. Chipping Off The Plaster In The Plinth Strip Up To The Brick Layer (Approx. 60 Cm High) And Removing The Destroyed Thin-Layer Coating Leveling The Remaining Surfaces.3. Desalting Of Exposed Brick With Sorption Compresses.4. Structural Strengthening Of Batches Of Weakened Bricks With A Priming Silicate Solution.5. Injection Of Deep Cracks In The Brick Structure And Deaf Detachments Of The Preserved Plaster, Through The Application Of Liquid Hydraulic Suspension With Strengthening Features And Increasing The Load-Bearing Capacity.6. Applying A Vapor-Permeable Renovation Plaster With The Wta Standard, Hydrophobizing Pores, Intended For Damp And Salty Substrates, In The Plinth Strip (On Exposed Brick Threads).7. Filling The Mineral Coatings Of The Pedestal In Order To Uniform The Surface And At The Same Time Filling The Micro-Cracks With A Thin-Layer Mortar With The Addition Of Microfibers.8. Application Of A Glaze, Vapor-Permeable Consolidating Coating (Referring To The Color Of The Sandstone) With An Appropriate Primer.9. Priming Areas Exposed To Increased Greenery (Especially At The Upper Eaves And In The Apiary Circle), With A Bactericidal, Fungicidal And Algaecide, With The Preventive Creation Of Active Substance Resources.10. Additional Protection Of Flat Surfaces By Covering With A Colorless Renovation Coating - Vapor-Permeable, Hydrophobic - Protecting Against Direct Weather Conditions, While Protecting Against Mold And Algae Attacks. Iii. Fence:Metal Spans1. Mechanical Cleaning Of Places With Visible Traces Of Corrosion At Assembly Joints. Conversion Protection With An Active Tannin Agent. Installation Of A Base Layer Containing Zinc.2. Gentle Removal Of Local Paint Peelings Without Damaging The Underlying Zinc Layer Using Soft Brushes. Cleaning The Entire Surface Of Loose Dirt.3. After Degreasing The Surface, Hand-Paint The Fence Spans With Appropriate Matte Black Paint. Granite Poles4. Hydrodynamic Cleaning Using Mild Surfactants. In Case Of Stronger Dirt, Use A Hydrofluoric Acid Solution - Max. 4%.5. Verification Of Secondary Putties In Terms Of Their Technical And Aesthetic Condition After Cleaning. If Possible, Attempt To Color Blend The Preserved Restorations Using Mineral Pigments On A Methacrylic Binder.6. If Additions Are Necessary, Select The Appropriate Type, Fraction And Color Of Aggregate In A Good Quality Hydraulic Binder. Texture The Surface In An Imitative Way.7. Final Impregnation Of The Stone With An Oil- And Hydrophobic Agent. Final Comments Of The Conservation Program: The Condition For A Good And Lasting Effect Of The Treatments Performed Is Their Very Careful Execution And Absolute Compliance With Conservation Technological Rigors, Including The Information Contained In The Technical Data Sheets Of The System Products Used. The Products Used During The Work Should Be High Quality - Intended For Work On Historic Buildings. When Using Ready-Made System Products, You Should Take Into Account The Many Years Of Experience Of Selected Companies In The Production Of Materials Dedicated To This Type Of Renovation Work.3. The Ordering Party Does Not Allow The Submission Of Partial Offers.4. Reasons For Not Dividing The Contract Into Lots: Dividing The Contract Into Parts Would Cause Disproportionate Difficulties In Coordinating And Organizing The Activities Of Various Contractors Implementing A Particular Scope Of The Contract, Which Could Significantly Jeopardize The Proper Performance Of The Entire Contract. The Scope And Specificity Of The Contract Justify Awarding The Contract To One Contractor Who Will Assume Responsibility And Risk For The Entire Contract. Dividing The Order Into Parts Would Impede The Effective Expenditure Of Funds And Timely Execution Of The Order.5. A Detailed Description And Method Of Order Execution Are Specified In The Design Documentation Constituting An Annex To The Swz.