The sewage discharge during the construction of
railway tunnel affects the environment sensitive area, hence, it is necessary
to set up a sewage treatment station. Onsite investigation of the
construction of tunnel sewage treatment stations is carried out on several
projects. Some conclusions are drawn as follows: (1) The diversion of clean
water and sewage can be realized in the construction period of the railway
tunnel to reduce the discharge of sewage and control the construction scale of
the tunnel sewage treatment station. (2) On the basis of the engineering
measures such as the production of sewage and the diversion of clean water
during the construction period and the reduction of the water inflow caused by
the tunnel lining and grouting, the sewage treatment scale of the tunnel sewage
treatment station can be determined by multiplying the normal water inflow per
unit length determined by different geological conditions by the length of the
unlined section and the variation coefficient of the water inflow. (3) It is
suggested that, on the basis of the charging scope stipulated in the current
general (budget) compilation method, the project cost of clean water and sewage
diversion, the installation, dismantling and amortization cost of sewage
treatment station equipment, and the operation and maintenance cost of sewage
treatment station should be included in the estimate.
