几内亚苏阿皮蒂项目大坝基坑排水方法探索与应用
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摘要
经研究、探索和总结,在苏阿皮蒂水利枢纽工程基坑混凝土施工中,一期基坑排水采用粗骨料碎石沿基岩面裂隙或沟槽铺设引水通道、最低点设置集水桶向外抽排水的办法,再适时对集水桶回填混凝土、引水通道回填灌浆。二期基坑采用在上下游侧以及中间部位设置临时集水坑,并用临时引水道相连,再适时用水下自密实混凝土回填集水坑。从基坑混凝土取芯检测结果看,质量合格,与基岩面接合良好。
The drainage methods of the dam foundation pits in Souapiti Hydropower Project of Guinea are introduced.For the first stage foundation pit,coarse aggregate gravels are laid along the cracks or grooves of the bedrock surface to form drainage channels,and water catchment buckets are set at the lowest points to drain the water outward. When appropriate,concrete backfill of the water catchment buckets and backfill grouting of the drainage channels should be carried out. For the second stage foundation pit,temporary catchment pits are set at the upstream and downstream sides and the center area,which are connected by temporary drainage channels. When appropriate,the catchment pits are backfilled with the underwater self-compacting concrete. Test results of the concrete coring samples in the foundation pit show that the concrete construction is qualified and the bonding with the bedrock surface is satisfactory.
The drainage methods of the dam foundation pits in Souapiti Hydropower Project of Guinea are introduced.For the first stage foundation pit,coarse aggregate gravels are laid along the cracks or grooves of the bedrock surface to form drainage channels,and water catchment buckets are set at the lowest points to drain the water outward. When appropriate,concrete backfill of the water catchment buckets and backfill grouting of the drainage channels should be carried out. For the second stage foundation pit,temporary catchment pits are set at the upstream and downstream sides and the center area,which are connected by temporary drainage channels. When appropriate,the catchment pits are backfilled with the underwater self-compacting concrete. Test results of the concrete coring samples in the foundation pit show that the concrete construction is qualified and the bonding with the bedrock surface is satisfactory.
引文
[1]DL/T 5144-2015,水工混凝土施工规范[S]
[2]DL/T 5330-2015,水工混凝土配合比设计规程[S]
[3]DL/T 5309-2013,水电水利工程水下混凝土施工规范[S]
[4]DL/T 5148-2012,水工建筑物水泥灌浆施工技术规范[S]
[2]DL/T 5330-2015,水工混凝土配合比设计规程[S]
[3]DL/T 5309-2013,水电水利工程水下混凝土施工规范[S]
[4]DL/T 5148-2012,水工建筑物水泥灌浆施工技术规范[S]