| 摘要 |
A strip of snow is applied to a support surface which is to be drained, and covered with a quick-setting concrete. When the snow melts after setting of the quick-setting concrete, the space between the support structure and the set concrete which was previously taken by the snow serves as a draining channel. The apparatus for producing the channel includes a snow-making machine, a spray nozzle for the snow, and a spray nozzle for the quick-setting concrete. |
