• Title/Summary/Keyword: 지하가설물

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A Preliminary Study on the Reused Channel-Type Lining Board with Corrosion-Damage (부식 강재 복공판의 재사용성 평가에 관한 기초적 연구)

  • Kim, In-Tae;Kim, Dong-Woo;Choi, Hyoung-Suk;Cheung, Jin-Hwan
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.13 no.4 s.56
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    • pp.170-179
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    • 2009
  • Channel-type lining board(CLB) is a welded steel structure used in the field of open cut subway excavation and building basement construction. Lining board is generally installed at the underground environment which is exposed to corrosion factors such as humidity, temperature and corrosive gases. This study evaluates reusability of the corroded lining board by experimental and analytical method. Static loading tests were performed to know serviceability of corroded CLB after checking thickness loss of the used CLB parts. Strain of the plates and middle point deflection was measured simultaneously. According to experimental test results and comparison with numerical analysis, the thickness loss of the plates by corrosion makes more vertical displacements and stresses in members under the DB vehicle load considering impact factor. As a result, this paper is proposed a way to evaluate used and corroded CLB by checking the plates thickness and it makes construction engineers easy to know optimal time to replace their old CLBs with new one.

Proposal for Safety Management of Formwork Construction Using IT Technology (IT 기술을 이용한 거푸집 동바리공사 안전관리 제안)

  • Jeon, Kyong-Deck;Shin, Seung-Jung
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.20 no.6
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    • pp.93-99
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    • 2020
  • In terms of construction work, the construction cost is lower than the importance of the construction, and since it is demolished after the completion of the construction, it is treated as a relatively small proportion compared to other construction types. Construction engineers who actually worked on the site talk about the safety of the construction work as the most important work of the various processes to ensure the quality and safety of the construction work. However, it is also true that safety management is difficult for temporary construction because various types of temporary materials are installed at various sites at the same time as construction progresses, and the main construction is carried out using them. Safety accidents in construction work are not much different even if they are carried out in temporary construction. The importance and safety of construction work cannot be neglected in view of the recent trend of large-scale construction, multi-purpose, excavation of large-scale underground spaces, and construction trends that are changing to skyscrapers. The purpose of this research is to secure the safety of Dongbar among the temporary materials used in construction work by using IT convergence technology, and to propose safety management to prevent safety accidents in the construction work.

Development and Application of a Self Climbing Safety Fence for Construction Building (건축공사용 안전펜스 공법의 개발 및 적용)

  • Choi Min-Woo;Roh Whan-Gil;Lee Jae-Yong;Lee Hyun-Soo
    • Korean Journal of Construction Engineering and Management
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    • v.1 no.3 s.3
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    • pp.108-115
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    • 2000
  • The average height of buildings in most cities is increasing in an effort to more effectively use land. In addition, as construction technology develops, rapid construction methods have been pursued. However, while there have been great strides in construction technology, the development of a temporary structure that can support the high-rise building under construction and the rapid construction methods has been relatively limited. If the temporary structure is not built on an outer wall of a building being constructed, a worker may be injured or killed in a fall and building materials such as blocks and other objects may fall to the ground, causing the build-up of trash around the building and possible injuries to persons in proximity to the building. This paper proposes a Self Climbing Safety Fence for construction building(SCfence). SCfence was developed to solve the above problems, a tent has been setup to cover the outer wall of the building, or a falling preventing net has been pitched in a direction perpendicular to the outer wall of the building. A case study was performed to verify the validity of SCfence through comparing the safety and cost experience between SCfence and the existing method.

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The Analysis of the Important Problems on Designing and Constructing Earth Retaining Structures (지반굴착 흙막이 구조물 설계 및 시공시 중요문제점 분석)

  • Lee, Song;Kim, Ju-Hyun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.6 no.2
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    • pp.167-174
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    • 2002
  • Earth retaining structure is constructed structure in order to construct a multistoried building, the subway, a subterranean downtown for effective use and obtainments of the limited ground. Recently, many kinds of research have been actively developed for a standardization and a database on designing and constructing of bridge, tunnel, road. With the works of database construction of that, many kinds of data with respect to statistics is cumulated. However, Database work of designed and constructed earth retaining structure in the construction field is wholly lacking and lagged behind in the works of database construction. This paper suggested classification system on indication data in connection with designing and constructing earth retaining structures a hundred fields. On the basis of that, code work with classification system was practised and DB program of indication data in connection with designing and constructing earth retaining structures was developed.

A Study on the Technological Improvement of Strut as a Permanent Structure (구조물 겸용 흙막이 스트러트 공법의 개선 연구)

  • Kim, Sun-Kuk;Hong, Won-Kee
    • Korean Journal of Construction Engineering and Management
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    • v.9 no.5
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    • pp.186-193
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    • 2008
  • The SPS, Strut as a Permanent System, method is widely adopted for the main structural member in addition to temporary strut function for the shuttering of excavation work. Although the SPS method has contributed to cost saving, time reduction, enhancement of structural stability, improvement of construction environment and so on at the building construction site, it caused the problems of increase of basement height and additional work for fire protection of steel structure. The increase of basement height caused the increase of shuttering depth and excavation, and the fire protection caused the additional cost as well as the deterioration of construction environment. In order to improve the problems, this paper is to propose a modularized hybrid structural system(HSD). The detail of the system is introduced and the structural performance and constructibility are proved through the experiment and site application.

Reduction of Differential Settlements due to Deep Excavation Using the Micro-piling Method (마이크로 파일을 이용한 가설 벽체 인접 구조물의 침하 억제에 관한 연구)

  • Huh, In-Goo;Hwang, Tae-Hyun;Lee, Sang-Ryeong;Shin, Jong-Ho;Kwon, Oh-Yeob
    • Journal of the Korean Geotechnical Society
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    • v.24 no.10
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    • pp.71-81
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    • 2008
  • Wall displacements caused by earth pressure, rainfalls, rise in ground water level, inappropriate deep excavation and structural defects of the wall may produce differential settlements to existing buildings, which often result in damages and/or collapses of the building structures. In this case, measures to protect the walls and nearby structures would be required. One of the recent measures to reduce differential settlements and protecting walls is to reinforce the ground using micro-piles. In this study physical model tests were carried out to evaluate the performance of the micro-pile method. It is revealed that reduction of the settlement was maximized when the length of micro-pile is twice of the foundation width, distance between piles is twice of the pile diameter and the distance to wall is one tenth of the foundation width. Based on the test results some design recommendations were made.

A Study on Integrated Cross Beam Improvement of Through Railway Plate Girder Bridge Support (철도 하로판형교 지점부의 일체형 가로보 개선에 관한 연구)

  • Ha, Yun-Soo;Kim, Doo-Hwan;Song, Kwan-Kwon;Kim, Seong-Pil;Lee, Seong-Geun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.22 no.4
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    • pp.114-120
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    • 2018
  • Recently, the plate girder bridge is offen designed a temporary bridge for underground roadway construction have not interrupt railroad operation. The integral support plate girder bridge which have longitudinal girder and cross-girder is improved workability and reduction cost and of construction time. The cross beam of the integral support plate girder bridge has a normal box shape to distribute load on the main girde to end both side girder. In this study, On the change to the web distance of the cross box shows characteristics of related to the stresses and displacements on the flange and web plate. Afterward, the various analysis contributed to the safety improvement of crossbeam of the integral support crossbeam plate girder bridge.

Design of the Railbeam Lengths at the Roadbed (철도 레일빔 설계법에 대한 연구)

  • Jung, Hyuksang
    • Journal of the Korean GEO-environmental Society
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    • v.17 no.1
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    • pp.21-28
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    • 2016
  • This paper deals with contents on the estimation of rail beam from the geotechnical engineering aspect. Rail beam is reinforced rail installed on the inside and outside of rail to prevent differential settlement during the construction period of railroad crossing construction. Such rail beam is frequently being installed to ensure stability of existing railroad facilities because of increasing constructions of underground structures crossing railroad in recent. However, there is a difficulty in design due to lack of design standard on rail beam length. Furthermore, derailing accidents are also occurring as a result of rail beam length shortage. Accordingly, this paper presented flow chart based on the classification into soil ground and bedrock ground for the rail beam length estimation. In addition, case study was conducted on rail combination and location through which effective rail combination and location were ensured.