求翻译：在混凝土桥梁的支架法施工中，混凝土早期性质对施工期结构安全有重要影响，常常成为施工期结构安全的决定因素和工程进度的控制因素是什么意思？

Support method of concrete bridge, nature has an important effect on structural safety during construction of concrete at early, often become the determinants of structural safety and progress of the project during construction period of control factors