The problem of water supply from the public distribution network still poses very serious problems in many cities in developing countries. Intermittent water supply pushes some households to build underground reinforc...The problem of water supply from the public distribution network still poses very serious problems in many cities in developing countries. Intermittent water supply pushes some households to build underground reinforced concrete tanks for water storage to cope with unwanted water breaks. This study that relies on the results of a survey of households in some areas of the city of Brazzaville (Republic of Congo) aims to verify the importance that users attach to the quality of the works constructed. Indeed, the reliability of the tanks resulting in their impermeability to the external environment has a direct impact on the quality of stored water and therefore the use that is made of water daily. Five areas were selected because of their soil moisture. By 256 tanks identified, 143 are made of reinforced concrete and 113 in masonry. The coating materials used to seal the walls are preferably the earthenware tiles (64% of tanks), then the Sika cement (31%). Food painting (5%) is only rarely used. However, 66% of households are not assured of the potability of the water stored. A significant number of households (46%) think that the stored water could be contaminated with noxious substances seeping from the outside through the walls of the tanks. The issue of sealing of underground water tanks, especially in areas where the water table is shallow, seems concerned users.展开更多
为探索加油站埋地油罐油气爆炸破坏效应,搭建埋地油罐燃爆试验平台,在油罐内布置压力传感器和温度传感器,在人孔井周围布置热流传感器,向罐内注入少量汽油,利用鼓吹方式使油气浓度达到爆炸极限,通过电火花点火模拟清罐、检修过程中的爆...为探索加油站埋地油罐油气爆炸破坏效应,搭建埋地油罐燃爆试验平台,在油罐内布置压力传感器和温度传感器,在人孔井周围布置热流传感器,向罐内注入少量汽油,利用鼓吹方式使油气浓度达到爆炸极限,通过电火花点火模拟清罐、检修过程中的爆炸事故,掌握埋地油罐、人孔井及周围环境受爆炸影响的压力冲击波和热辐射数据。结果表明,加油站发生埋地油罐敞口爆炸时,爆炸会对罐壁产生峰值强度为100~400 k Pa的冲击波。爆炸形成的火焰和冲击波向人孔井口正上方释放,不会向四周扩散。展开更多
文摘The problem of water supply from the public distribution network still poses very serious problems in many cities in developing countries. Intermittent water supply pushes some households to build underground reinforced concrete tanks for water storage to cope with unwanted water breaks. This study that relies on the results of a survey of households in some areas of the city of Brazzaville (Republic of Congo) aims to verify the importance that users attach to the quality of the works constructed. Indeed, the reliability of the tanks resulting in their impermeability to the external environment has a direct impact on the quality of stored water and therefore the use that is made of water daily. Five areas were selected because of their soil moisture. By 256 tanks identified, 143 are made of reinforced concrete and 113 in masonry. The coating materials used to seal the walls are preferably the earthenware tiles (64% of tanks), then the Sika cement (31%). Food painting (5%) is only rarely used. However, 66% of households are not assured of the potability of the water stored. A significant number of households (46%) think that the stored water could be contaminated with noxious substances seeping from the outside through the walls of the tanks. The issue of sealing of underground water tanks, especially in areas where the water table is shallow, seems concerned users.
文摘为探索加油站埋地油罐油气爆炸破坏效应,搭建埋地油罐燃爆试验平台,在油罐内布置压力传感器和温度传感器,在人孔井周围布置热流传感器,向罐内注入少量汽油,利用鼓吹方式使油气浓度达到爆炸极限,通过电火花点火模拟清罐、检修过程中的爆炸事故,掌握埋地油罐、人孔井及周围环境受爆炸影响的压力冲击波和热辐射数据。结果表明,加油站发生埋地油罐敞口爆炸时,爆炸会对罐壁产生峰值强度为100~400 k Pa的冲击波。爆炸形成的火焰和冲击波向人孔井口正上方释放,不会向四周扩散。
