A study on the air leakage performance improvement of duct coupling for temporary ventilation of long subsea tunnel

Hyeong-Je  Jo; Dea-Kee  Min; Jong-Won  Kim; Ju-Kyung  Lee; Jong-Hoon  Beak

doi:10.9711/KTAJ.2017.19.2.319

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A study on the air leakage performance improvement of duct coupling for temporary ventilation of long subsea tunnel 초장대 해저터널의 공사중 덕트 접속부의 누풍 성능 개선에 관한 연구

31 March 2017. pp. 319-333

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Abstract

The construction of long sub-sea tunnel does not provide the favorable condition for the installation of ventilation system to be used during construction due to the constrained construction space. For the ventilation system required during construction, the artificial island where ventilation shaft is located is constructed at some location along the sub-sea tunnel route, which requires a high construction cost. Therefore, it is intended, as much as possible technically, to minimize the construction of artificial island. However, this requires a longer distance between ventilation shafts, there-by causing increased air leakage at the ventilation duct connection points due to the higher fan pressure being required to deliver ventilation air. Previously the air leakage was studied as an important issue. In this study experiments were carried out to develop the improved duct connection method considering various conditions such as, tunnel length, etc. Additionally, its performance results with leakage rates are shown and compared to the “S” class leakage rate of SIA. As a result, the new duct coupling type of improved method is analyzed as applicable to such a 30 km long tunnel with the leakage rate of 1.46 mm²/m² , which is better performance than SIA leakage rates.

Keywords

해저터널

공사중 환기

누풍율

환기성능

덕트접속방식

초장대 해저터널의 건설은 건설공간의 제약 및 건설비용 측면에서, 공사중에 사용되는 환기 시스템 설치에 유리한 조건을 갖고 있지 않다. 공사중 환기시스템을 제공하기 위해, 환기갱이 설치되는 인공섬들이 해저터널의 루트를 따라서 일부 위치마다 건설됨으로써, 건설 비용이 많이 소요된다. 따라서 이러한 인공섬의 수를 최소화하는 것이 경제적으로 필요하다. 그러나 이것은 환기갱 사이의 거리가 더 길어지게 되므로, 필요한 환기풍량을 이송하기 위한 높은 팬 압력으로 인해 환기 덕트 접속부에서 누풍이 더 많이 발생하게 된다. 선행 연구에서 공기 누설이 중요한 문제임을 조명하였다. 본 연구는 개선된 덕트 접속 방식을 개발하기 위한 실험들을 소개하고, 또한 SIA 의 “S” 등급 누풍율 및 다양한 조건들을 비교하여 터널 연장에 따른 달성된 누풍율의 환기 성능을 제시한다. 본 연구의 결과로 누풍율이 1.46 mm²/m²인 새로운 접속방식을 개발하였으며, 개선된 방식이 30 km규모의 장대터널에 적합한 것으로 분석되었다.

키워드

Sub-sea tunnel

Ventilation for construction

Air leakage ratio

Ventilation performance

Duct coupling method

References

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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 :2
Pages :319-333
Received Date : 2017-03-17
Revised Date : 2017-03-24
Accepted Date : 2017-03-27
DOI :https://doi.org/10.9711/KTAJ.2017.19.2.319

Journal of Korean Tunnelling and Underground Space Association ISSN:2233-8292(Print) 2287-4747(Online) 한국터널지하공간학회 논문집

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