• Title/Summary/Keyword: Underground Works

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Development of Protocol Analyzer Suited for Maintenance of LonWorks Netwo가 for Safety Management of Underground Facilities (지하시설의 안전관리를 위한 LonWorks 네트워크의 유지보수에 적합한 프로토콜 분석기의 개발)

  • Kim, Hyung-Ki;Choi, Gi-Sang;Choi, Gi-Heung
    • Journal of the Korean Society of Safety
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    • v.25 no.6
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    • pp.203-209
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    • 2010
  • A compact ANSI/EIA 709.1 protocol analyzer system suited for maintenance of LonWorks network for safety management of underground facilities was developed and tested. The hardware is based on the TMS320LF2406A embedded system, and the software was designed using Visual C++6.0 under Windows XP environment. Connected to the LonWorks network the developed protocol analyzer decodes the raw packets and pass them to the master PC through USB port. Then on the PC the packets are processed and analyzed in various aspects and the key features that are essential to the maintenance of LonWorks network installed at underground facilities are displayed in a user-friendly format. Performance of the developed protocol analyzer was evaluated through a series of experiments, by measuring the speed of packet analysis and the error rate. The protocol analyzer proved to work reliably even under the increased bandwidth. However, more comprehensive tests under various underground environmental conditions are desired.

The Subway Construction Design of Japan (일본의 지하철 건설설계실례)

  • Keik Ito;takaguki Sasanuma
    • Explosives and Blasting
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    • v.9 no.2
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    • pp.8-12
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    • 1991
  • The Land price in Tokyo Vicinity was, increased 65.3% than Last year. so, it trend to get Subway constructed in deeper Underground. But, the subway Construction Cost is more increaseel beeause it is needed long works term, all modernized facilities beside that, deeper subway cocstruction works brought another task such as deeper entrance shaft sinking, Ventilation escapeway, all Underground water Treatment. In addition, Civil Act must be also amended became at Present landowner covers ground and Underground.

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Study on the Safe Evacuation Management in a Power Supply Disturbed Emergency

  • Suzuki, Nobuyuki;OHASHI, Tsubasa;WHORLOW, James R
    • International conference on construction engineering and project management
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    • 2015.10a
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    • pp.87-91
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    • 2015
  • For construction projects it is imperative that site management gives the highest priority to planning safe site evacuation for all foreseeable emergencies, including earthquakes and typhoons which are often experienced in Japan. This is especially important and even more critical for high risk projects involving underground works, such as Tunneling & Pneumatic Caissons. Based on the safety regulation of underground works, a back-up power supply system must be provided during the construction period at all times. Often, fluorescent lamps with re-chargeable batteries are provided for infrequent emergency cases, however these have a questionable useable life span and thus need careful maintenance and periodical replacement. In this paper we focused on using the phosphorescence materials to indicate the evacuation direction. As a result, it was confirmed that the phosphorescence materials were considered useful in reducing panic and facilitating a controlled evacuation in the event of a total black-out due to power failure.

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Corrosion behavior of coated steel pipes for water works with water content of soil (토양의 함수율에 빠른 상수도용 도복장 강관의 부식거동에 관한 연구)

  • Park, Kyung-Wha;Bae, Jeong-Hyo;Ha, Tae-Hyun;Lee, Hyun-Goo;Ha, Yoon-Cheol;Kim, Dae-Kyeong
    • Proceedings of the KIEE Conference
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    • 2004.11a
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    • pp.227-229
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    • 2004
  • The corrosion rate of buried steel pipes for water works was investigated under soil environment. Steel pipe shows various characteristics caused by complicated environment condition of underground and especially the corrosion rate of it depends on the resistivity of soil controlled by content of water. In this paper, the corrosion behavior of steel pipe was observed by polarization test under soil and the silica sand in the water content range of 0-50%. Generally it is well known that the resistivity of soil decreased rapidly over 15% water content. In fact the corrosion rate, corrosion potential, and corrosion consumption (MPY) of steel pipe were shown very different aspects within 20% water content.

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The Factors Governing Envlronment and Safety in Underground Spaces (지하공간의 환경 및 안전관리 요소)

  • 김복윤
    • Proceedings of the Korean Geotechical Society Conference
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    • 1993.10b
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    • pp.133-162
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    • 1993
  • The environment of underground spaces might be considered in view of working environment during the construction and living environment after completion of the construction work. For controlling environment of underground space, an appropriate measures have to be taken on the governing factors such as air flow, dust, gases, heat, radiation, noise, illumination and water. The more critical matter, in underground environmental point of view, is underground disasters such as fire, gas explosion and water inrush. This paper presents the general introduction of these factors mentioned above and some outcomes of research works as of now.

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Case Study on the Improvement of Underground Building Works through the VE (VE 적용에 의한 지하 골조공사 개선연구)

  • Hong Jae-Wook;Kim Sun-Kuk;Lee Jong-Kook
    • Korean Journal of Construction Engineering and Management
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    • v.5 no.3 s.19
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    • pp.106-113
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    • 2004
  • Most construction project managers should focus on the reasonable cost-down with same quality and function-enhancement with same cost for the value-added construction project delivery in construction industry. Especially, a building structure construction is one of the most important processes to affect the total cost and schedule in building construction project. It means that the process has the possibility of project cost-down or quality-enhancement among the whole project life-cycle. This research focuses on the importance of underground structure of building project by increasing underground use ratio in the urban building construction projects nowadays. This research adopts VE method for the improvement of cost and time by process and analysis dimension modeling on the underground building structure construction, and verifies it throughout the case study, This research is the basic study on the improvement of underground building works through the value engineering method in construction industry.

Deformation Behaviors of Temporary Tieback Wall during Excavation Works (현장계측과 수치해석을 이용한 가설 흙막이 구조물의 변형특성 연구)

  • 김종우
    • Tunnel and Underground Space
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    • v.5 no.3
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    • pp.223-229
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    • 1995
  • During excavation works for underground facilities, temporary tieback wall with earth anchor system was investigated for safety's sake. An excavation 9.7 meter deep was monitored by slope inclinometer in twelve measuring points. Instrumented lateral displacements of the wall during 177 days are represented. Especially, lateral displacements of the two positions under completely different condition are compared to investigate the effect of backfilling between soldier pile and the soil behind wall. The deformation behaviors of the wall according to both depth and elasped time are discussed. Finally, a numerical analysis by the program FLAC was performed, and calculated displacements are compared to measured ones.

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A new geophysical exploration method based on electrical resistivity to detect underground utility lines and geological anomalies: Theory and field demonstrations

  • Jo, Seon-Ah;Kim, Kyoung-Yul;Ryu, Hee-Hwan
    • Geomechanics and Engineering
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    • v.18 no.5
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    • pp.527-534
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    • 2019
  • Although ground investigation had carried out prior to the construction, many problems have arisen during the civil-engineering works because of the presence of the unexpected underground utility lines or anomalies. In this study, a new geophysical exploration method was developed to solve those problems by improving and supplementing the existing methods. This new method was based on the difference of electrical resistance values between anomalies and surrounding ground medium. A theoretical expression was suggested to define the characteristics of the anomalies such as location, size and direction, by applying the electric field analysis. An inverse analysis algorithm was also developed to solve the theoretical expression using the measured electrical resistance values which were generated by the voltage flowing the subsurface medium. To verify the developed method, field applications were conducted at the sites under construction or planned. From the results of the field tests, it was found that not only the new method was more predictive than the existing methods, but its results were good agreed with the measured ones. Therefore, it is expected that application of the new exploration method reduces the unexpected accidents caused by the underground uncertainties during the underground construction works.