Underground Tunneling under an Ancient Bridge as a Measure for Cultural Relic Protection:A Case Study of Broken Rainbow Bridge in the Palace Museum
Shallow buried-tunneling method is a common practice for underground construction.It is often used for building tunnels and urban pipeline and drainage system.Due to the special process involved,during shallow underground tunneling,precise control is required based on onsite conditions when a cultural relics buildings or other significant structure is encountered to ensure that the impact of the construction work is controllable.The Broken Rainbow Bridge is the oldest building in the Palace Museum,witnessing the ups and downs over three dynasties,namely,Yuan,Ming and Qing,in China's history,and still standing after 600 years since its completion.Due to its long history,it is considered a significant cultural relics buildings which was extremely difficult to build.However,information relating to its original construction work and structure is very scarce.Taking underground tunneling under the Broken Rainbow Bridge during the infrastructure development in the Palace Museum as an example,this paper reviews the ideas about shallow underground tunneling under cultural relics buildings and significant struc-tures,summarizes construction and conservation measures,and identifies relevant solutions before proposing feasible approaches to similar construction work in the future.
utility tunnelthe Palace Museumcultural relic protection areaancient building complex
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