• Title, Summary, Keyword: trenchless

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Design and Fundamental Experiment on Trenchless Replacement of Old Sewerage (노후하수관 교체시 비굴착방식 신공법기술개발)

  • Noh, Jong-Ho;Lee, Young-Ki;Roh, Hong-Koo;Han, Min-Ho;Lee, Sung-Chul;Lim, Il
    • Proceedings of the SAREK Conference
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    • pp.1327-1331
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    • 2008
  • The study aims to enhance the trenchless replacement of old sewerage. The trenchless replacement was designed as real size and tested in the field of construction. This trenchless replacement was new technology in construction. The result was good performance in the construction. In the future, the trenchless replacement should be use as the exchange equipment of old sewerage.

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Trenchless Repairing-Reinforcing Process of Underground Pipes with Advanced Composite Materials (신소재 복합재료를 이용한 비굴착 지하매설관 보수-보강공법)

  • 진우석;권재욱;이대길;유애권
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.43-48
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    • 2001
  • To overcome the disadvantages of conventional excavation technology, various trenchless (or excavation free, or no-dig) repair-reinforcement technologies have been developed and tried. But trenchless technologies so fat developed have some brawbacks such as high cost and inconvenience of operation. In this study, a repairing-reinforcing process for underground pipes with glass fiber fabric polymer composites using VARTM(Vacuum Assisted Resin Transfer Molding) has been developed. The developed process requires shorter operation time and lower cost with smaller and simpler operating equipments than those of the conventional trenchless technologies. For the reliable operation of the developed method, a simple method to apply pressure and vacuum to the reinforcement was devised and flexible mold technology was tried. Also, resin filling and cure status during RTM process were monitored with a commercial dielectrometry cure monitoring system, LACOMCURE. From the investigation, it has been found that the developed repairing-reinforcing technology with appropriate process variables and on-line cure monitoring has many advantages over conventional methods.

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A study on the Development Plan for Trenchless Technology of Water Pipeline in Korea (국내 상수 관로의 Trenchless Technology 개발 방안 연구)

  • Kim, Jeong-Hyun;Bae, Cheol-Ho
    • Journal of Korean Society of Water Science and Technology
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    • v.25 no.4
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    • pp.3-20
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    • 2017
  • The water pipeline system has continuously aged and been deteriorated, and aging of the pipeline system increases pipe failure risk and O&M cost. Any significant breaks may cause significant economic, social, and environmental impact. It is most important for managing the pipelines to maintain water supply service without significant disruption through rehabilitation, replacement of aged pipelines, and new installation. Pipe condition assessment and structural monitoring technology is necessary for proactively detect defects before actual failure occurs. The definition of trenchless technology is methods, materials, and equipment capable of being used for the installation of new or replacement or rehabilitation of existing underground infrastructure with minimal disruption to surface traffic, business, and other activities. Trenchless technologies can be used to inspect, construct, repair, rehabilitate and replace buried pipes without disrupting the adjacent properties or public. This study is to establish the R&D plan for water pipe inspection, assessment, monitoring technology to precisely monitor structural integrity and provide effective assessment data for rehabilitation decision making process, and trenchless replacement and installation construction technology of water mains.

A Study on Repairing Retired Underground Buried Pipes Using RTM (RTM을 이용한 노후 지하 매설관의 보수-보강에 관한 연구)

  • 진우석;권재욱;이대길
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.249-252
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    • 2000
  • To overcome problems of excavation technology far repairing or replacing underground buried pipes which are worn out or damaged, various trenchless repair-reinforcement technologies have been invented. But these trenchless technologies also have many problems in the aspect of economy and convenience of operation. In this research, the repair-reinforcement process using RTM (Resin Transfer Molding) which can solve problems of present trenchless technologies was developed. The resin wetting and void removal during RTM process to form large composite structures inside of buried pipes were experimentally investigated. From the experiment, it was found that the new technology had advantage over conventional methods by employing appropriate process parameters and void removal vents.

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Evaluation of Design Equation and Stability for Trenchless Pipe Liner System with Boundary Treatment (비굴착 전체보수용 라이너의 두께 설계식 및 말단부 처리에 따른 라이너의 안정성 검토 연구)

  • Park, Jong-Sup;Song, Ho-Myeon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.5
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    • pp.1166-1172
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    • 2007
  • Drainage pipeline system repaired by trenchless technology using liners can be defined between partial and entire collapse. The liners in the partial collapse pipeline are subjected to only uniform groundwater pressure on the surface. This research evaluates practical and useful cured-in-placed pipe (CIPP) design equations based on experimental results and finite element analysis results. Also, stability evaluation of pipe liner system with edge treatment is performed using finite element analysis. The CIPP equation should be used to design liner pipe system.

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Trenchless Repairing-Reinforcing Process of Underground Pipes with Advanced Composite Materials (신소재 복합재료를 이용한 비굴착 지하매설관 보수-보강공법)

  • 진우석;권재욱;이대길;유애권
    • Composites Research
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    • v.15 no.1
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    • pp.21-31
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    • 2002
  • To overcome the disadvantages of conventional excavation technology various trenchless (or excavation free, or no-dig) repair-reinforcement technologies have been developed and tried. But trenchless technologies so far developed have some drawbacks such as high cost and inconvenience of operation. In this study, a repairing-reinforcing process for underground pipes with glass fiber fabric polymer composites using VARTM (Vacuum Assisted Resin Transfer Molding) has been developed. The developed process requires shorter operation time and lower cost with smaller and simpler operating equipments than those of the conventional trenchless technologies. For the reliable operation of the developed method, a simple method to apply pressure and vacuum to the reinforcement was devised and flexible mold technology was tried. Also, resin filling and cure status during RTM process were monitored with a commercial dielectrometry cure monitoring system, LACOMCURE. From the investigation, it has been found that the developed repairing-reinforcing technology with appropriate process variables and on-line cure monitoring has many advantages over conventional methods.

A preliminary study on the use of analytic hierarchy process for selecting a optimum trenchless excavation method (최적의 비개착공법 선정을 위한 계층분석법의 적용에 관한 기초연구)

  • Kang, Tae-Ho;Chang, Soo-Ho;Choi, Soon-Wook;Lee, Chulho;Cho, Jinwoo
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.17 no.6
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    • pp.685-693
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    • 2015
  • There have been high demands for urban underground structures. However, they should be rapidly constructed while maintaining the functions of adjacent structures and road systems especially in urban areas. In this respect, trenchless excavation methods are considered to very effective in minimizing ground displacements during excavation works. A variety of field conditions such as economic, technical and environmental aspects should be taken into consideration when an optimum trechless excavation method is to be chosen in a given condition. Therefore, this study aims to carry out a fundamental study to select an optimum trenchless excavation method by the decision making technique. Especially, AHP (Analytic Hierarchy Process) which is a kind of a multiple attribute decision making process is adopted to consider the opinions of experts and to derive reliable decision criteria. As a result, the weights of key factors and the most effective trenchless methods for different ground conditions were proposed in this study.

Behavior of Lateral Earth Pressure around the Underpass Constructed by the STS Construction Method

  • Jin, Kyu-Nam;Kim, Hyo-Jin;Sim, Young-Jong
    • LHI Journal of Land, Housing, and Urban Affairs
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    • v.7 no.4
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    • pp.271-279
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    • 2016
  • Recently developed trenchless construction methods ensure stability for the ground settlement by inserting steel pipes along the underpass section and integrating steel pipes before ground excavation to form pipe-roof. This study is to confirm the reinforcing effect of pipe-roof by measuring lateral earth pressure acting on the underpass constructed by the STS (Steel Tube Slab) construction method. For this purpose, lateral earth pressure was measured at the left and right side of the pipe-roof after installing earth pressure cells. As a result, lateral earth pressure was measured with considerable reduction because the integrated pipe-roof shared surcharge. Therefore, economic design for the underpass could be expected by sharing design load by pipe-roof. In addition, construction cost was analyzed according to the design-load sharing ratio by pipe-roof. As pipe-roof shares design load by 40%, the total construction cost can decrease by almost 10% in the case of four-lane underpass.

A case study on perforation under Daejeon station building by Front-Jacking method (Front-Jacking공법에 의한 대전역사 하부 관통사례)

  • Kim, Yong-Il;Hwang, Nak-Yeon;Jeong, Du-Seok;Cha, Jong-Hwi;Lee, Nae-Yong
    • Proceedings of the Korean Society for Rock Mechanics Conference
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    • pp.195-203
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    • 2006
  • The crossing construction under railroad have two methods which are cut and cover and trenchless method. first, cut and cover method is an extremely limited method concerning non-running time. Whereas, trenchless method is free from restriction such as train speed and running time, and has the strong points of safe and rapid construction. Front Jacking method, one of the trenchless methods, is frequently applied recently due to its stability during construction and vantage of assuring schedule reliability. The procedure is that after minimizing interlocking friction with structure and earth pressure due to jacking the small steel tube, pulling the precast box manufactured at the field in the ground using PC strand and hydraulic Jack. This method is able to be applied regardless of section size and length of box and condition of ground. And that is also pro-environmental. This paper presents the case of Daejeon E. W. perforate Road Project applied with the Front Jacking method.

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