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http://dx.doi.org/10.9711/KTAJ.2019.21.4.455

A study on the field application of high strength steel pipe reinforcement grouting  

Shin, Hyunkang (Infrastructure Design Group, Infra Division, POSCO E&C)
Jung, Hyuksang (Dept. of Railway Construction and Safety Engineering, Dongyang University)
Ryu, Yongsun (Chemius Korea Co., Ltd.)
Kim, Donghoon (City Planning Team of Jeju Urban Construction Department)
Publication Information
Journal of Korean Tunnelling and Underground Space Association / v.21, no.4, 2019 , pp. 455-478 More about this Journal
Abstract
In this paper, we conducted experimental investigation on the field applicability through the verification of reinforcement effect of the steel pipe reinforcement grouting using high strength steel pipe. SGT275 (formerly known as STK400) steel pipe is generally applied to the traditional steel pipe reinforcement grouting method. However, the analysis of tunnel collapse cases applying the steel pipe reinforcement grouting shows that there are cases where the excessive bending and breakage of steel pipe occur. One of the reasons causing these collapses is the lack of steel pipe stiffness responding to the loosening load of tunnels caused by excavation. The strength of steel pipe has increased due to the recent development of high strength steel pipe (SGT550). However, since research on the reinforcement method considering strength increase is insufficient, there is a need for research on this. Therefore, in this study, we conducted experiments on the tensile and bending strength based on various conditions between high strength steel pipe, and carried out basic research on effective field application depending on the strength difference of steel pipe through the conventional design method. In particular, we verified the reinforcement effect of high strength steel pipe through the measurement results of deformed shape and stress of steel pipe arising from excavation after constructing high strength steel pipe and general steel pipe at actual sites. The research results show that high strength steel pipe has excellent bending strength and the reinforcement effect of reinforced grouting. Further, it is expected that high strength steel pipe will have an arching effect thanks to strength increase.
Keywords
High strength steel pipe; The reinforcement grouting of steel pipe; Bending shear force; Tensile strength; The effect of steel pipe reinforcement;
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