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A study on the development and field application of SP-Rockbolt with high-strength steel pipe

고강도 강관을 적용한 SP-록볼트 개발 및 현장 적용을 위한 연구

  • Shin, Hyunkang (Infrastructure Solution Group, Infra Division, POSCO E&C) ;
  • Jung, Hyuksang (Dept. of Railway Construction and Safety Engr., Dongyang University) ;
  • Ahn, DongWook (Hot Rolled and Construction Steel Materials Solution Group, Steel Business Division, POSCO)
  • 신현강 ((주)포스코건설 인프라사업본부 인프라솔루션그룹) ;
  • 정혁상 (동양대학교 철도건설안전공학과) ;
  • 안동욱 (POSCO 철강사업본부 강건재열연솔루션그룹)
  • Received : 2017.07.14
  • Accepted : 2017.07.26
  • Published : 2017.07.31

Abstract

For initial stability of the tunnel, the primary support, Shotcrete and rockbolt shall be placed in the most appropriate time. This is because the role of such support plays a vital role in long-term and short-term tunnel stability. In this study, the rock bolt is an important supporting system that receives the external pressure generated by the stress relaxation during tunnel excavation as axial force and transmits it to the shotcrete on the tunnel excavation surface. Until now, most of the materials of rock bolts have been used in the field, but there have been many problems such as uncertain quality of Chinese materials entering the market, poor packing due to falling down of rock bolts when filled with mortar, and corrosion due to water. Therefore, in this study, we have developed a high strength steel pipe rock bolt using Autobeam material to solve and improve various problems of existing rock bolts. In order to evaluate the performance of the developed bolt, field tests were carried out and the existing mortar filler in order to improve the performance of the rock bolt, the design and construction criteria were studied and the results were included in this paper.

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