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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

Hyunkang Shin1
,
Hyuksang Jung2*
,
DongWook Ahn3
신 현강1
,
정 혁상2*
,
안 동욱3
1Member, Infrastructure Solution Group, Infra Division, POSCO E&C
Member, Assistant Prof. Dept. of Railway Construction and Safety Engr., Dongyang University
3Member, Hot Rolled and Construction Steel Materials Solution Group, Steel Business Division, POSCO
1정회원, ㈜포스코건설 인프라사업본부 인프라솔루션그룹 시니어매니져
정회원, 동양대학교 철도건설안전공학과 조교수
3정회원, POSCO 철강사업본부 강건재열연솔루션그룹 책임연구원
*교신저자. *Corresponding Author. 
31 July 2017. pp. 651-668
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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.

Keywords
Deformed bars
High-Strength steel pipe rockbolts
Grout filler
Pull-out test
Rockbolts design criteria

터널 굴착에 따른 초기 안정성 확보를 위해 1차 지보재인 숏크리트와 록볼트를 가장 적절한 시기에 터널 굴착면 주면으 로 타설하여야 한다. 이러한 지보재의 역할은 장ㆍ단기적인 터널 안정성에 매우 중요한 역할을 하기 때문이다. 여기서 록 볼트는 터널 굴착시 응력이완에 따라 발생되는 외압을 축력으로 받아들여 터널 굴착면의 숏크리트에 전달하여 전체적인 안정성을 도모하는 중요한 지보재이다. 현재까지 록볼트의 재료는 현장 수급이 유리한 이형강봉을 많이 이용하였으나 최근들어 불확실한 품질의 중국산 자재의 시장진입과 록볼트 주면 모르타르 충전시 흘러내림에 의한 밀실한 충전불량, 용수에 의한 부식 등 다양한 문제점이 나타나고 있다. 특히, 현재의 설계기준상 이형강봉에 대한 기계적 성질의 기준은 있으나 그 외 섬유보강 플라스틱(FRP) 등이 사용될 수 있으나 명확한 기준은 제시되지 않고 있다. 그래서 새로운 소재로 개발되더라도 실제 현장 적용에 있어서는 해결해야 할 부분이 많다. 따라서, 본 연구에서는 상기의 기존 록볼트가 지니고 있는 여러 문제점을 해결, 개선하고자 Autobeam 재료를 이용한 고강도 강관 록볼트(Samrt Pipe-록볼트, 이하 SP-록볼 트)를 개발한 내용을 다루고 있다. 개발된 록볼트의 성능평가를 위해 현장시험을 수행하고, 기존 모르타르 충전을 개선 할 수 있는 충전재를 개발하여 록볼트의 성능을 더욱 향상하고자 하였다. 또한, 실무현장의 적용성 확보를 위해 설계 및 시공기준에 대한 연구를 수행하였다.

키워드
이형강봉 록볼트
고강도 강관 록볼트
시멘트 모르타르 충전재
인발시험
록볼트 설계기준
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Information
  • Publisher :Korean Tunneling and Underground Space Association
  • Publisher(Ko) :한국터널지하공간학회
  • Journal Title :Journal of Korean Tunnelling and Underground Space Association
  • Journal Title(Ko) :한국터널지하공간학회 논문집
  • Volume : 19
  • No :4
  • Pages :651-668
  • Received Date : 2017-07-14
  • Revised Date : 2017-07-19
  • Accepted Date : 2017-07-26
  • DOI :https://doi.org/10.9711/KTAJ.2017.19.4.635
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