Is the hole decoration an accessory facility of tunnel engineering?

Belong to. Entrance decoration is considered as one of the ancillary facilities of tunnel engineering. The ancillary facilities of tunnel engineering refer to various facilities set up to ensure the normal use and safe operation of the tunnel, including ventilation, lighting, drainage, fire control, monitoring and communication. As a part of tunnel engineering, the entrance decoration mainly plays the role of beautifying the entrance and exit of tunnel, improving the overall image of tunnel and protecting the entrance and exit structure of tunnel.