长联络通道冻结施工技术

Freezing technology applied in long cross-passage

介绍了郑州轨道交通5号线土建07标2号联络通道工程特点及冻结施工情况,指出该联络通道长度较大,所处地层条件比较复杂,距离干线铁路及高架桥较近,地层沉降控制要求高。针对工程特点,采用低温快速冻结,及时泄压控制冻胀;开挖中初支快速闭合,壁后及时注浆等方式,有效控制地层变形,为类似工程提供了借鉴。

The project characteristics and freezing construction of the 07 standard 2# liaison channel for civil construction of Zhengzhou rail transit line 5 are introduced. It is pointed out that the length of the liaison channel is large,the formation conditions are complex,the distance from the trunk railway and the viaduct is close,and the control requirement of the formation settlement is high. In view of the engineering characteristics,the rapid freezing at low temperature,the timely pressure relief control frost heave,the rapid closure of the initial support in the excavation,the timely grouting in the wall and so on,effectively control the deformation of the formation,and provide a reference for similar projects.