During the EPC (expendable pattern casting) process, one of the essential requirements is to prevent pattern distortion duringsand filling and compaction. A new method which vibrates the system in a two-dimensional ci...During the EPC (expendable pattern casting) process, one of the essential requirements is to prevent pattern distortion duringsand filling and compaction. A new method which vibrates the system in a two-dimensional circular mode has been appliedto the EPC process. The molding properties of unbonded sand obtained by this new vibration mode are investigated andcompared with those in the one-dimensional vertical mode. For adequate compaction of sand. the circular vibration mode ismore effective than the vertical mode. Sand became more fluidized by the circular vibration and the particle pressure coefficientwas close to unity The particle pressure coefficient, which is defined as the ratio of horizontal to vertical sand pressure, isresponsible for the effectiveness of sand filling.展开更多
在传统咨询模式下,采用工程总承包(engineering,procurement and construction,EPC)模式的老旧小区改造项目在实施过程中普遍存在各专业咨询信息沟通欠缺、咨询成果不佳、项目进度滞后、工程质量难以把控及投资超出预期等问题。文章以...在传统咨询模式下,采用工程总承包(engineering,procurement and construction,EPC)模式的老旧小区改造项目在实施过程中普遍存在各专业咨询信息沟通欠缺、咨询成果不佳、项目进度滞后、工程质量难以把控及投资超出预期等问题。文章以宣城某老旧小区改造EPC项目为例,分析项目实施问题,运用全过程咨询管理模式组织项目管理,以期切实提高老旧小区改造项目的管理水平及投资管控效果,从而为类似项目提供参考。展开更多
文摘During the EPC (expendable pattern casting) process, one of the essential requirements is to prevent pattern distortion duringsand filling and compaction. A new method which vibrates the system in a two-dimensional circular mode has been appliedto the EPC process. The molding properties of unbonded sand obtained by this new vibration mode are investigated andcompared with those in the one-dimensional vertical mode. For adequate compaction of sand. the circular vibration mode ismore effective than the vertical mode. Sand became more fluidized by the circular vibration and the particle pressure coefficientwas close to unity The particle pressure coefficient, which is defined as the ratio of horizontal to vertical sand pressure, isresponsible for the effectiveness of sand filling.
文摘在传统咨询模式下,采用工程总承包(engineering,procurement and construction,EPC)模式的老旧小区改造项目在实施过程中普遍存在各专业咨询信息沟通欠缺、咨询成果不佳、项目进度滞后、工程质量难以把控及投资超出预期等问题。文章以宣城某老旧小区改造EPC项目为例,分析项目实施问题,运用全过程咨询管理模式组织项目管理,以期切实提高老旧小区改造项目的管理水平及投资管控效果,从而为类似项目提供参考。
