Introduction (Segmental Hand-dig Tunnel)
Segmental tunneling is a method extremely suited to the urban areas where the shafts are too small for the conventional pipe jacking method. The system involves a shield head which is launched into the ground and segment rings followed close behind. The erection of the pre-frbricated segmental rings are done within the shield head. The spoil is excavated manually from the tunnel face and transferred to ground level to be disposed off site. Man access is required to erect the rings and as such the minimum size is usually 1200mm.
Client ： Drainage Services Department
Contract No.：DC/2013/01
Main Contractor ：Top Express Construction Engineering Co., Ltd.
Project Title：Tolo Harbour Sewage of Unsewered Area 2 – Phase I
Sub-contract Works ： Construction of 1200mm dia. Segmental Tunnel (Manual Excavation) and install 200mm DI Pipe, 450mm DI Pipe and 225mm VC Pipe in the Tunnel.
Works Location ： 1. 36m, 31m, 20m, 12m and 47m at Sha Tin Heights Road
2. 15m at Nam Wo Po
3. 40m at Tai Po Road
4. 33m at K.K.Terrace
Working Period: 2015 – 2017
