Shenyang Artificial Lake Anti-Seepage Construction Process
The anti-seepage project at Shenyang Artificial Lake involves a series of carefully planned steps to ensure the long-term integrity and waterproofing of the lake. The process begins with basic excavation, followed by the application of a 20-30mm mortar protection layer on the lake bottom. Next, slope cutting, compaction, and leveling are performed to prepare the base for further work. A composite geomembrane is then installed alongside the vertical retaining wall, ensuring a secure and watertight connection. The base surface is thoroughly cleaned and leveled before handing over the site for the next phase. All underwater pipes are sealed properly to prevent any leakage. The composite geomembrane is laid and welded in place, followed by a detailed inspection and handover process. After welding and repair, the quality is checked, and finally, a full completion acceptance is conducted. **Project Overview** 1. The highest designed water level is approximately 0.6 meters. 2. The total area requiring waterproofing is about 800 square meters. 3. A ceramsite brick masonry retaining wall has been constructed. 4. There is a collapse pit located beneath the water. **Main Waterproof Materials** 1. Composite geomembrane rolls with specifications: 50*4m; 150g/m²/0.5mm/150g/m². 2. GB rubber waterstop strips are used for sealing joints and connections. **Basic Conditions for Construction** 1. After foundation excavation, slopes are cut, leveled, and compacted. Disturbed soil is backfilled in layers, sprinkled with water, and compacted, with each layer no thicker than 400mm. 2. All sharp objects such as bricks, stones, glass, metal chips, branches, and plant roots are removed to avoid damage to the geomembrane. 3. The surrounding retaining walls, pump pits, bridge foundations, and underwater nozzles must be fully completed before the geomembrane installation begins. **Welding and Laying Technology** 1. **Welding Technique** - Weld bead lap width should be between 80-100mm. - Natural folds on flat and vertical surfaces should be 5%-8%. - A 3%-5% expansion and contraction allowance is recommended. - Scrap residue should be kept between 2%-5%. - Hot-melt welding temperature is set between 280-300°C, with a travel speed of 2-3m/min. - Double-welding is used for better sealing. - Damaged areas are repaired by cutting out the affected part, using hot melt adhesive, and sealing with polyethylene. - No imitation connections are allowed; mechanical stitching is used instead. - Underwater nozzles are sealed using GB rubber sealing strips, metal bands, and corrosion-resistant treatment. 2. **Laying Technique** - The composite geomembrane is laid from east to west or vice versa. Each section includes the height of the retaining walls on both sides and is completed in one go. - The laying sequence follows the channel axis towards the south and north directions. - First, a 20-30mm mortar protective layer is applied at the lake bottom, followed by pasting the geomembrane to the vertical retaining wall. - The bonding process involves applying adhesive to both the geomembrane and the wall, letting it dry for about 5 minutes, then pasting, pressing, and flattening. The adhesive is made from asphalt latex paint, cement, and water. After pasting, nails are fixed above the waterline and treated for waterproofing. **Quality Acceptance** 1. The materials and construction of the composite geomembrane comply with national standards issued by the State Administration for Market Regulation. 2. Quality checks include self-inspection by the construction unit, sampling inspections, and other relevant procedures. 3. Welding quality is tested using the "inflation pressure method," while repairs are done through visual inspection. The inflation pressure detection standard is 0.06MPa. 4. The quality acceptance process includes process handover, completion acceptance, and other necessary steps. 5. Normal leakage of the artificial lake should not exceed 15mm per 24 hours (including seasonal evaporation loss). **Construction Schedule** 1. The daily output is approximately one unit per day for an area of 2000-2500 square meters. 2. The planned construction period is three days. **Recommendations** 1. It is essential to strengthen the protection and management of composite geomembrane products. Raising the awareness of construction workers regarding waterproofing is crucial to ensure timely commissioning and project quality. 2. It is recommended that the contractor assign a dedicated supervisor to monitor the work. Any damage to the geomembrane found by related personnel should be reported immediately for prompt repair. 3. The geomembrane should be protected from oil stains, as this can reduce its bonding strength. For more information on storage and protection, refer to the "Introduction to Geomembrane Construction Methods." 4. The following points should be closely monitored: - After welding, the mortar protective layer on the lake bottom must be installed first. - The bridge foundation waterproofing should use a steel-penetrating welding method, with a mortar protective layer to prevent quality issues caused by electric welding. - When combining the composite geomembrane with the wall surface, care should be taken to avoid large-area air pockets. Http://news.chinawj.com.cn Submission:
The anti-seepage project at Shenyang Artificial Lake involves a series of carefully planned steps to ensure the long-term integrity and waterproofing of the lake. The process begins with basic excavation, followed by the application of a 20-30mm mortar protection layer on the lake bottom. Next, slope cutting, compaction, and leveling are performed to prepare the base for further work. A composite geomembrane is then installed alongside the vertical retaining wall, ensuring a secure and watertight connection. The base surface is thoroughly cleaned and leveled before handing over the site for the next phase. All underwater pipes are sealed properly to prevent any leakage. The composite geomembrane is laid and welded in place, followed by a detailed inspection and handover process. After welding and repair, the quality is checked, and finally, a full completion acceptance is conducted. **Project Overview** 1. The highest designed water level is approximately 0.6 meters. 2. The total area requiring waterproofing is about 800 square meters. 3. A ceramsite brick masonry retaining wall has been constructed. 4. There is a collapse pit located beneath the water. **Main Waterproof Materials** 1. Composite geomembrane rolls with specifications: 50*4m; 150g/m²/0.5mm/150g/m². 2. GB rubber waterstop strips are used for sealing joints and connections. **Basic Conditions for Construction** 1. After foundation excavation, slopes are cut, leveled, and compacted. Disturbed soil is backfilled in layers, sprinkled with water, and compacted, with each layer no thicker than 400mm. 2. All sharp objects such as bricks, stones, glass, metal chips, branches, and plant roots are removed to avoid damage to the geomembrane. 3. The surrounding retaining walls, pump pits, bridge foundations, and underwater nozzles must be fully completed before the geomembrane installation begins. **Welding and Laying Technology** 1. **Welding Technique** - Weld bead lap width should be between 80-100mm. - Natural folds on flat and vertical surfaces should be 5%-8%. - A 3%-5% expansion and contraction allowance is recommended. - Scrap residue should be kept between 2%-5%. - Hot-melt welding temperature is set between 280-300°C, with a travel speed of 2-3m/min. - Double-welding is used for better sealing. - Damaged areas are repaired by cutting out the affected part, using hot melt adhesive, and sealing with polyethylene. - No imitation connections are allowed; mechanical stitching is used instead. - Underwater nozzles are sealed using GB rubber sealing strips, metal bands, and corrosion-resistant treatment. 2. **Laying Technique** - The composite geomembrane is laid from east to west or vice versa. Each section includes the height of the retaining walls on both sides and is completed in one go. - The laying sequence follows the channel axis towards the south and north directions. - First, a 20-30mm mortar protective layer is applied at the lake bottom, followed by pasting the geomembrane to the vertical retaining wall. - The bonding process involves applying adhesive to both the geomembrane and the wall, letting it dry for about 5 minutes, then pasting, pressing, and flattening. The adhesive is made from asphalt latex paint, cement, and water. After pasting, nails are fixed above the waterline and treated for waterproofing. **Quality Acceptance** 1. The materials and construction of the composite geomembrane comply with national standards issued by the State Administration for Market Regulation. 2. Quality checks include self-inspection by the construction unit, sampling inspections, and other relevant procedures. 3. Welding quality is tested using the "inflation pressure method," while repairs are done through visual inspection. The inflation pressure detection standard is 0.06MPa. 4. The quality acceptance process includes process handover, completion acceptance, and other necessary steps. 5. Normal leakage of the artificial lake should not exceed 15mm per 24 hours (including seasonal evaporation loss). **Construction Schedule** 1. The daily output is approximately one unit per day for an area of 2000-2500 square meters. 2. The planned construction period is three days. **Recommendations** 1. It is essential to strengthen the protection and management of composite geomembrane products. Raising the awareness of construction workers regarding waterproofing is crucial to ensure timely commissioning and project quality. 2. It is recommended that the contractor assign a dedicated supervisor to monitor the work. Any damage to the geomembrane found by related personnel should be reported immediately for prompt repair. 3. The geomembrane should be protected from oil stains, as this can reduce its bonding strength. For more information on storage and protection, refer to the "Introduction to Geomembrane Construction Methods." 4. The following points should be closely monitored: - After welding, the mortar protective layer on the lake bottom must be installed first. - The bridge foundation waterproofing should use a steel-penetrating welding method, with a mortar protective layer to prevent quality issues caused by electric welding. - When combining the composite geomembrane with the wall surface, care should be taken to avoid large-area air pockets. Http://news.chinawj.com.cn Submission:
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