Journal of Korean Tunnelling and Underground Space Association (한국터널지하공간학회 논문집)

Korean Tunnelling and Underground Space Association (한국터널지하공간학회)
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Waterproofing performance evaluation according to each waterproofing material due to segment construction error

세그먼트 시공오차에 따른 이음부 지수재별 방수성능 평가

  • Heo, Seung-Mu (Dept. of Civil and Environmental Engineering, Konkuk University) ;
  • Jung, Hoon (Dept. of Civil and Environmental Engineering, Konkuk University) ;
  • Lee, Seok-Won (Dept. of Civil and Environmental Engineering, Konkuk University)
  • 허승무 (건국대학교 사회환경공학부) ;
  • 정훈 (건국대학교 사회환경공학부) ;
  • 이석원 (건국대학교 사회환경공학부)
  • Received : 2018.09.05
  • Accepted : 2018.10.25
  • Published : 2018.11.30
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Abstract

The interest in the use of shield TBM (Tunnel Boring Machine) on the tunnel excavation has been increased rapidly in Korea. The shield TBM tunnel is generally designed as non-drainage tunnel. Consequently, if water leakage through the segment joints happens, big problems on the usage and stability of tunnel can be occurred. In this study, the variation of waterproof capacity of hydrophilic rubber waterstop and gasket, respectively by the construction error and excessive displacement of segment was studied. The test results show that hydrophilic rubber waterstop has favorable on the offset, however unfavorable on the gap. On the other hand, gasket has unfavorable on the offset, however favorable on the gap.

최근 국내에서는 쉴드 TBM (Tunnel Boring Machine)을 이용한 터널 굴착에 대한 관심이 크게 증가하고 있다. 쉴드 TBM 터널은 비배수 터널로써 세그먼트 이음부에서 누수가 발생할 경우에는 터널의 사용성 및 안정성에 문제가 될 수 있다. 본 연구에서는 쉴드 TBM 터널의 세그먼트 시공 시 시공오차 및 세그먼트 과다변형에 의한 수팽창 지수재 및 가스켓 각각의 방수 성능을 검토하였다. 실험결과, 수팽창 지수재는 엇갈림에 대해서는 대응성이 좋으나, 틈새 간격에 대해서는 대응성이 불리한 것으로 나타났다. 반면에 가스켓은 틈새 간격에 대해서는 대응성이 좋으나, 엇갈림에 대해서는 대응성이 불리한 것으로 나타났다.

Keywords

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Fig. 1. Definition of gap and offset

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Fig. 2. Cause of water leakage (construction site #1)

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Fig. 3. Cause of water leakage (construction site #2)

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Fig. 4. Hydrophilic rubber

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Fig. 5. Test apparatus for hydrophilic rubber waterstop

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Fig. 6. Leakage at T-joint

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Fig. 7. Leakage at straight line

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Fig. 8. EPDM gasket

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Fig. 9. Test apparatus for gasket

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Fig. 10. Waterproofing of gasket according to offset

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Fig. 11. Waterproofing of gasket according to gap

Table 1. Design code for hydrophilic rubber waterstop

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Table 2. Design code for gasket

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Table 3. Dimension of hydrophilic rubber waterstop

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Table 4. Summary of waterproof tests for hydrophilic rubber waterstop

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Table 5. Dimension of EPDM gasket

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Table 6. Summary of waterproof tests for gasket

TNTNB3_2018_v20n6_1023_t0006.png 이미지

References

  1. Choi, W.Y., Lee, H.P., Jun, G.C., Lee, S.W. (2014), "Evaluation of waterproof and durability of hydrophilic waterstop", Journal of Korean Tunnelling and Underground Space Association, Vol. 16, No. 2, pp. 117-124. https://doi.org/10.9711/KTAJ.2014.16.2.117
  2. Hyun, K.C., Min, S.Y., Moon, J.B., Jeong, G.H., Lee, I.M. (2012), "Risk management applicable to shield TBM tunnel: I. Risk factor analysis", Journal of Korean Tunnelling and Underground Space Association, Vol. 14, No. 6, pp. 667-681. https://doi.org/10.9711/KTAJ.2012.14.6.667
  3. Kim, S.H., Kim, W.K., Lee, H.Y. (2013), "Effect of segment thickness during shield TBM tunnelling in case study", Journal of Korean Tunnelling and Underground Space Association, Vol. 15, No. 3, pp. 311-320. https://doi.org/10.9711/KTAJ.2013.15.3.311
  4. Kim, Y.I., Hencher, S.R., Yoon, Y.H., Cho, S.K. (2002), "Determination of the construction method for Young Dong tunnel by risk assessment", Journal of Korean Tunnelling and Underground Space Association, Vol. 4, No. 1, pp. 13-25.
  5. Korea Infrastructure Safety Corporation (2013), Development of performance evaluation standard and maintenance manual of special excavation tunnel (shield tunnel).
  6. Lee, S.W., Jeoung, J.H., Hwang, J.H. (2009), "Evaluation of hydrophilic waterstop for shield TBM tunnel under high water pressure", Proceedings of the Korean Geo-Environmental Conference 2009, Seoul, Korea, pp. 389-392.