トンネル水噴霧設備放水位置の低位置化

抄録

Water spray systems are installed on highway tunnels to prevent the increase of damages by vehicle fire accidents. The installation standards of tunnel emergency facilities including the water spray system are classified according to the tunnel rank. At the Takaosan Tunnel of the Ken-O Expressway, water spray system additional installation construction has become necessary due to the change of the tunnel rank. However, this construction period is long-term and traffic volume at the Takaosan Tunnel increased rapidly greater than the expected. It was supposed that the number of the traffic restrictions would be increased and it affects the customers and its safety. Therefore, we examined the lower positioning of the water spray system without the functional degradation to reduce the number of traffic restrictions.