Abstract:

There are great risks in the construction of the connection passages of shieldbored tunnels. In the paper, a new technology for the construction of the connection passages of shieldbored tunnels, i.e., Novel Material Jacking Cuttable Segment (NOMJS), is put forward. The new technology is described as follows: a specialdesigned pipe jacking machine is used to cut the segment lining of the shieldbored tunnel directly to form the connection passage. During the launching and receiving of the pipe jacking machine, water sealing frame and integral receiving device are installed. In this way, the risks in the construction of the connection passages is reduced greatly and the process of the construction of the connection passages is simplified. The segment, which can be cut by the pipe jacking machine directly, is composed of cuttable concrete and glass fiber and can meet the requirements of the tunnel lining and the direct cutting by the pipe jacking machine. The jacked pipes for the connection passages, which are made of steel, include launching pipes, receiving pipes, conventional pipes and special pipes. The launching pipes, receiving pipes, water sealing frames and integral receiving device, which are specially designed, can seal the gaps, cope with emergency conditions and can be removed rapidly.

Key words: connection passage, pipe jacking method, launching, receiving, integral receiving device, cuttable composite segment