Journal of Digital Convergence (디지털융복합연구)

The Society of Digital Policy and Management (한국디지털정책학회)
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A Study on the Self-contained Earth Retaining Wall Method Using Bracing

브레이싱을 이용한 자립식 흙막이 공법에 관한 연구

  • Kim, Jong-Gil (Dept. of Civil Engineering, Chungwoon University)
  • 김종길 (청운대학교 토목환경공학과)
  • Received : 2018.12.28
  • Accepted : 2019.03.20
  • Published : 2019.03.28
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Abstract

In a construction site, excavation work has a close relation with temporary earth retaining structure. In order to build the underground structure most effectively in a narrow space, prevent soil relaxation of the external behind ground in excavation work, and maintain a ground water level, it is required to install a temporary earth retaining structure that secures safety. To prevent soil washoff in underground excavation work, the conventional method of temporary earth retaining structure is to make a temporary wall and build the internal support with the use of earth anchor, raker, and struct for excavation work. RSB method that improves the problem of the conventional method is to remove the internal support, make use of two-row soldier piles and bracing, and thereby to resist earth pressure independently for underground excavation. This study revealed that through the field application cases of RSB method and the measurement result, the applicability of the method for installing a temporary earth retaining structure, the assessment result, and displacement all met allowable values of measurement, and that the RSB method, compared to the conventional method, improved constructability and economy.

건설현장의 굴토작업과 흙막이 가시설은 서로 밀접한 관계를 가지고 있다. 협소한 공간에서 가장 효율적으로 지하구조물을 축조하고 굴토작업시 외측 배면의 토사 이완을 방지하고 지하수위를 유지하기 위한 방안으로 안전성이 확보된 흙막이 가시설 설치는 반드시 필요하다. 본 연구는 기존 지하층 굴토공사에서 흙의 유실을 방지하기 위해 설치하는 가설흙막이를 종래에는 가설벽체를 형성하고 어스앵커, 래커, 스트러트 등을 이용하여 내부 지보를 하고 굴토공사를 시행하던 방식에서, RSB공법은 기존 재래식공법의 문제점을 개선하여, 내부 지보재를 제거하고 2열 엄지말뚝과 브레이싱을 이용하여 자립으로 토압에 저항하도록 하여 지반굴착을 진행하는 공법이다. 본 연구에서는 RSB공법 현장시범적용과 계측결과를 통하여 굴착방법에 따른 흙막이 가시설의 공법 적용성, 평가결과 발생변위가 모두 계측 허용치 만족하고. 기존 재래식공법에 비해 시공성과 경제성이 향상되었다.

Keywords

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Fig. 1. Basic concept of RSB method

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Fig. 2. Cross-section

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Fig. 3. Modeling of structural analysis

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Fig. 4. Results of Stress Analysis

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Fig. 6. Test construction plan

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Fig. 5. Test construction flow chart

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Fig. 7. Test construction foreground Photo

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Fig. 8. Field measurement and numerical analysis graph

Table 1. Comparison of existing methods

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Table 2. Target structure overview

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Table 3. Drill result table

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Table 4. Structural analysis and field measurement results

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