在运用模板台车进行隧道全断面二次衬砌施工中，模板台车初始位置的定位和浇筑过程中对空洞的判断一直是施工过程中的2个难点。模板台车定位通常采用悬挂铅坠和全站仪相结合的人工测量方法，但垂线对正的方式存在较大误差，定位过程繁琐且非常依赖施工经验；传统空洞检测方法工作效率低，并具有一定危险性，补浆时会损坏拱顶浇筑结构。为改善这些问题，针对定位和空洞判断，对控制系统进行设计并介绍相应的施工方案。该控制系统同时具备激光定位和空洞监控功能，利用高精度激光传感器对模板台车进行定位，采用电极液位传感器对是否存在空洞进行监控。此外，该系统还配套开发相关信息化软件，具备视频监控、同步数据等功能，实现人机交互及模板台车数据传输。

During construction of fullface tunnel lining with formwork trolley, initial positioning of formwork trolley and cavity monitoring behind lining are considered to be two difficulties. The formwork trolley usually adopts manual measurement method, i.e. combining use of hanging lead drop and total station, which is sophisticated and often relies on construction experience. To avoid the disadvantages of traditional method, such as low efficiency, being dangerous, and often resulting in crown top structure damage in slurry replenishing, a new control system combining both functions of laser positioning and cavity monitoring is designed and the related construction scheme is introduced respectively. The control system has high precision laser sensor to fix the formwork trolley and adopts electrode liquid level sensor to test holes. In addition, related information software equipped with the function of video monitoring, synchronous data, etc., makes to realize data transmission and manmachine interaction.