• Title/Summary/Keyword: 비굴착

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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.

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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    • 2008.06a
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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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Application of Direct Current Voltage Gradient(DCVG) to Water Supply Pipeline Survey (상수도 관로 조사에 대한 피복손상탐측기술(DCVG)의 적용)

  • Jong Sik Kim;Chang Gun Shin;Bong Gu Cho;Kyung Jun Seo
    • Proceedings of the Korea Water Resources Association Conference
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    • 2023.05a
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    • pp.493-493
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    • 2023
  • 매설배관의 피복손상부 탐측법은 CIPS법, DCVG법 등 여러 방법이 있으며, 그중 우리나라에서는 DCVG법이 가장 많이 사용되고 있다. 피복손상탐측기술(DCVG)은 매설된 관로에 대하여 직류 전류로 인해 배관주변에 발생하는 전위구배를 측정하여 비굴착상태에서 관로의 피복손상부를 찾아내는 기술이다. 본 기술을 광역상수도 정밀안전진단 및 성능평가에 적용하였으며, 탐측된 위치에 대하여 위험도(%IR)를 예측하였다. 또한 손상의심부에 대한 굴착을 통해 피복손상부를 확인하였다. 본 기술의 신뢰성 및 상수도 분야에 큰 활용성을 확인하였다. 관경, 현장여건 등에 따른 조사 및 굴착에 일부 한계점을 보였으나, 향후 축적된 데이터를 바탕으로 매설된 관로의 손상을 사전에 확인하여 관로사고를 미연에 방지할 기술로 판단된다.

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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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    • 2001.10a
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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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Characterization of Repairing PVC profile for Trenchless Sewer Pipeline (비굴착 하수관로용 PVC 프로파일 보수재 특성 평가)

  • Park, Joon-Ha;Jeon, Sang-Ryeol;Lee, Kwan-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.7
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    • pp.4977-4983
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    • 2015
  • The full depth excavation induces couple of technical and social problems like increase of construction cost and time for excavation and backfill, increase of public complains and delay of traffic, and so force. In order to overcome these problems, lots of laboratory tests were carried out for sewer pipeline of maintenance materials with trenchless methods. The testing materials are PVC strip and then the lab tests were followed by Korean Standard. We will treat the structure safety and pipe integrity of PVC profile more excellent than the profile have application to SPR. There is no side-effect to process and to satisfy the criteria of tensile strength, impact strength and softening temperature. The profile with resin adhesive showed no leakage of water at specific pressure.

Study of structural properties and development of high strength Cured-In-Place Pipe (CIPP) liner for sewer pipes using glass fiber (유리섬유를 이용한 하수관의 고강도 현장경화 비굴착 보수 공법 재료의 개발 및 물성 특성 연구)

  • Ji, Hyon Wook;Koo, Dan Daehyun;Yoo, Sung Soo;Kang, Jeong-Hee
    • Journal of Korean Society of Water and Wastewater
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    • v.34 no.2
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    • pp.149-159
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    • 2020
  • Cured-in-place-pipe(CIPP) is the most adopted trenchless application for sewer rehabilitation to extend the life of the existing sewer without compromising both direct construction and indirect social costs especially applied in the congested urban area. This technology is globally and domestically known to be the most suitable for partial and full deteriorated pipe structure rehabilitation in a sewer system. The typical design of CIPP requires a significant thickness of lining to support loading causing sewage flow interruption and increasing material cost. This paper presents development of a high strength glass fiber composite lining material for the CIPP application and structural test results. The test results exhibit that the new glass fiber composite lining material has 12 times of flexural strength, 6.2 times of flexural modulus, and 0.5 Creep Retention Factor. These test results can reduce lining design thickness 35% at minimum. Even though taking into consideration extra materials such as outer and inner films for actual field applications, the structural capacity of the composite material significantly increases and it reduces 20 percent or more line thickness as compared to the conventional CIPP. We expect that the newly developed CIPP lining material lowers material costs and minimizes flow capacity reduction, and fully replaceable to the conventional CIPP lining materials.

Characterization of Repairing Polyurethane for Trenchless Sewer Pipeline (비굴착 하수관로용 폴리우레탄 보수재 특성 평가)

  • Park, Jun-Ha;Jeon, Sang-Ryeol;Lee, Kwan-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.16 no.5
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    • pp.3542-3547
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    • 2015
  • There is commonly used the full depth excavation method of sewer pipeline maintenance in Korea. This induces couple of technical and social problems like increase of construction cost and time for excavation and backfill, increase of public complains and delay of traffic, and so force. In order to overcome these problems, lots of laboratory tests were carried out for sewer pipeline of maintenance materials with trenchless methods. The testing materials are liquid and hardened polyurethane, and polyurethane CIPP. The lab tests were followed by Korean Standard. There are no side effects, like harmless to the human body and air pollution with stink. Judging from the limited test results, all the items tested were satisfied the KS criteria.