海河隧道沉管沉放对接的主要施工技术

Key Construction Technologies of Sinking and Docking of Immersed Tube of Haihe River Tunnel

海河隧道工程采用沉管法工艺施工,在中国北方首次应用。通过沉放对接技术的应用,实现沉管管段在水中的精确对接,针对沉管的浮运、沉放、对接等关键问题进行重点分析与阐述,采用岸拖方式将沉管管段依次浮运至沉放区域;采用浮驳吊沉法工艺进行管段沉放;利用全站仪、GPS、倾角仪实时监控并调整管段空间位置及姿态;利用水力压接将GINA止水带压缩,完成沉管对接。施工结果表明,采用岸拖法浮运、浮驳吊沉法、水力压接技术进行沉管对接是成功的,技术上是可靠的。

The immersed tube method was used in the construction of Haihe River Tunnel, and it was the first time to be used in the north of China. By using the docking technologies, the accurate docking in water for immersed tube segment could be achieved. In this paper, some key issues are analyzed and described, such as the floating transportation, sinking and docking of the immersed tube and so on. By using the shore towing technique, the immersed tube segments were transported to the sinking area successively. By using the floating barge crane technique, the tube segments were put down to the water. By using total station device, GPS and inclinometer, the space position and gesture of the tube segments were real-timely monitored and adjusted. By using hydraulic pressure connecting technique, the GINA water-stops were compressed so that the docking of immersed tubes could be completed. The construction results show that by using the shore towing technique, floating barge crane technique and hydraulic pressure connecting technique, the docking of immersed tubes can be completed successfully and reliably.