Trial Design Study on Ribbed UHPC Prefabricated Assembled Box-type Utility Tunnel
As a new type of fiber-reinforced concrete construction material,ultra-high performance concrete(UHPC)has been applied in underground utility tunnels because of its weight loss,economy and good durability.Therefore,taking Pingtan comprehensive utility tunnels in Fujian Province as an example,the trial design of ribbed UHPC prefabricated box-type utility tunnels was conducted.The results show that the trial design meets the requirements of mechanical performance,and has a large safety reserve and improvement space;Compared with the original C40 utility tunnel,the amount of concrete and steel bars in the ribbed UHPC prefabricated box-type utility tunnel is re-duced by 51.6％and 53.6％respectively.Although the cost of ribbed UHPC prefabricated box-type utility tunnels is 1.38 times that of the original C40 utility tunnels,considering the mechanical properties,construction efficiency,structural transportation and other aspects,the ribbed UHPC prefabricated box-type utility tunnels is still superior to the original C40 comprehensive utility tunnels.The research results can provide a reference for the application of ribbed UHPC prefabricated box-type utility tunnels.
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