• Title, Summary, Keyword: Tower slope

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The Development of the Slope Monitoring System(SMS) of the Tower Crane (타워크레인의 기울어짐 측정 시스템 개발)

  • Shin, Woon-Chul;Hong, Yong-Soo
    • Journal of the Korean Society of Safety
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    • v.25 no.6
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    • pp.60-64
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    • 2010
  • The purpose of this study if to prevent dangerous accident of the overthrow of the tower crane in summer's hurricane. We develop the SMS in order to give automatic alarm system to operator within the dangerous range and to give a information of the exactly slope in the real time. The slope value of the tower crane is compose of direction, pitch by the front and rear, roll by the right and left and synthesis by the its pitch and roll. Especially, the synthesis eliminate the effect of the wall tie or wire bracing. So, this value should correctly indicate the actual slope. In this study, more applying field test should be applied with the SMS. In the future, a more measurement device can be applied to, and be able to feed more alarm criteria for the review of the risk in the field.

A Study of the Slim Design of Overhead Transmission Tower (가공송전철탑 경량화 설계에 관한 연구)

  • Lee, Jung-Won;Lee, Won-Kyo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.7
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    • pp.560-565
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    • 2010
  • This paper presents the design factor of an overhead transmission tower structure in order to reduce the tower weight. The behaviour of transmission tower structures are affected by the horizontal angle of the tower structure, the equivalent wind pressure group, the slope of the main post of the tower, the separation of the internode and the use of high-strength materials in their construction. Tower weight can be reduced by approximately 30% reduce weight by means of optimal design based on a consideration of all the above factors. In addition, the design of the foundation of the tower with the shear key installation to increase horizontal support together with a modified angle of inclination to the ground can reduce by about 37% the amount of concrete used during construction. The area of ground disturbed by the construction of the tower foundation can thus be reduced by approximately 33%. Therefore it is possible to build an environmently-friendly T/L tower with the mechanical properties of existing towers.

Numerical modeling on the stability of slope with foundation during rainfall

  • Tran, An T.P.;Kim, Ah-Ram;Cho, Gye-Chun
    • Geomechanics and Engineering
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    • v.17 no.1
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    • pp.109-118
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    • 2019
  • The movement of soil along a slope during rainfall can cause serious economic damage and can jeopardize human life. Accordingly, predicting slope stability during rainfall is a major issue in geotechnical engineering. Due to rainwater penetrating the soil, the negative pore water pressure will decrease, in turn causing a loss of shear strength in the soil and ultimately slope failure. More seriously, many constructions such as houses and transmission towers built in/on slopes are at risk when the slopes fail. In this study, the numerical simulation using 2D finite difference program, which can solve a fully coupled hydromechanical problems, was used to evaluate the effects of soil properties, rainfall conditions, and the location of a foundation on the slope instability and slope failure mechanisms during rainfall. A slope with a transmission tower located in Namyangju, South Korea was analyzed in this study. The results showed that the correlation between permeability and rainfall intensity had an important role in changing the pore water pressure via controlling the infiltrated rainwater. The foundation of the transmission tower was stable during rainfall because the slope failure was estimated to occur at the toe of the slope, and did not go through the foundation.

Deformation Characteristics of Cut-Slope Composed of Colluvial Soil in Tae Baek Area (강원도 태백지역의 붕적층 절토사면의 변형특성)

  • 김경열;이대수;홍성연
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.467-474
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    • 2002
  • Colluvial sell has a very unique deformation property, particularly when it is subject to the cutting work entailed in a variety of construction. In this study, the cut slope tying on a colluvial layer in which the transmission tower had been installed were investigated to find out the cause of deformation. In-situ tests such as boring, surface-wave analysis (MASW) were employed to look into the physical composition of underground layers and FEM including LEM were carried out to simulate the construction steps. The result shows that the stress relaxation followed by road construction induced the deformation of the slope and damage in the foundation of the transmission tower.

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Development of a Transport Method to use Continuous Cableway System for Transmission Line Construction Work (송전선로 건설공사 연삭 삭도공법 개발)

  • Baik, Seung-Do;Min, Byeong-Wook;Kim, Sang-Duk;Choi, Jin-Sung;Kim, Do-Hwa
    • Proceedings of the KIEE Conference
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    • pp.679-681
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    • 2005
  • The materials for transmission line construction were transported by road which opened in mountainous areas until the mid 1990s, However, from the mid 1990s, as social interest in the environment standard increases, a cable way and helicopter transport methods of construction have been applied to minimize damage to the environment and to build an environmental friendly system. The current cable way method is a single cable way system which has a lower section base to load materials into a carriage and carry them to the tower construction site by use of an engine and a main rope. Then the carriage lowers itself via a slope between the tower construction site and the lower section base. The single cable way system has the demerits of site acquisition for the lower section base, forest felling when installing the wire rope, and it is not applicable to a even topology Also it has to be installed separately at each tower site. Accordingly, to carry materials without forest felling and regardless of slope, the chain cable way system was developed to provide materials for more than two towers consecutively by use of an engine carriage and winch.

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Mt. Yokmang Landscape Planning in Busan New Port (부산 신항만 욕망산 경관계획)

  • Kim Choong-Sik
    • Journal of the Korean Institute of Landscape Architecture
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    • v.33 no.6
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    • pp.127-139
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    • 2006
  • Mt. Yokmang landscape design awarded first in [North container terminal site furtherance construction in Busan new port], design competition sponsoring in the Korea Container Terminal Authority in 2005. Design guideline was to propose the symbol of new port and to establish landscape plan in consideration of view and geological location. Because landscape plan required establishment of restoration plan for cutting slope, Mt. Yokmang became the major object. The purpose of planning are as follows. The first purpose is to minimize existent natural environment damage, and the second, to connect with ambit and create new image. The third is to provide place of rest and interchange for local resident. Reflecting stratum structure and landscape characteristics, cutting slope consisted of [utilization slope], [presentation slope], [landscape slope], and [ecological slope]. Vegetation design applied ecological restoration method through restoration of stratum, and eve environment-friendly afforestation, planned program that can connect area with existing ecosystem. In process that decides form of the cutting slope, analyze view structure and visual exposure in various access routes, sensitivity etc. was accomplished. Also, symbolic tower(Ocean Polaris) that presents in architecture and landscaping features, night landscape planning could gain synergy effect by keeping consistence with landscape and ecological planning. Passing through final design and construction process, I expect that the Mt. Yokmang will be a new landmark in Busan new port.

Comparison of a Point-Grid-Method and a Buffering-Method to Calculate Skidding Distance for Timber Harvest Planning (목재수확계획을 위한 집재거리 계산방법중 포인트그리드방법과 버퍼링방법의 비교분석)

  • Park, Soo-Kyoo;Kang, Gun-Uh
    • Journal of Korean Society of Forest Science
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    • v.97 no.6
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    • pp.611-616
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    • 2008
  • The investigation was accomplished on the test area in Forest Practice Research Center in order to compare Point Grid method with Bufferring method in process of the calculation of the Actual Mean Skidding Distance with the GIS aided harvesting method. the investigation site amounted to 264.9 ha in area and 32.67 m in the road density, 306.1 m in road spacing. the Net Correction Factor (Kn) was 1.53 in both sides skidding. the theoretical mean skidding distance was 72.52 m. the shortest mean skidding distance amounted to 149.57 m with point grid method and 139.68 m with Buffering methode. skidding distance correction factor (Kr) was 2.15. actual mean skidding distance amounted to 251.51 m and factor of wood assortment skidding (Kg) was 3.29. when the tractor (Dongyang) and tower yader (Koller 303) are used on investigation site, the logging cost is calculated 11,808 Won with Tractor below 25% slope and 12,336 won with Tractor between 25~55% slope, 10,020 won with Tower Yarder more than 55% slope.

A Case Study of Blast Excavation for a Deep Foundation of a Power Transmission Tower (발파에 의한 심형기초(深礎抗)의 굴착 시공 사례 연구)

  • Lee, Song;Lee, Jae-Hyun;Kim, Yong-Jin;Lim, Dae-Kyu;Lee, Woo-Jin
    • Proceedings of the Korean Geotechical Society Conference
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    • pp.403-410
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    • 2000
  • In this study, an experimental programme was performed to improve drilling and blasting efficiency, Case study in geologically different strata place showed that a new blasting pattern with different explosive charges and construct procedures to guard a blasted slope should be needed

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Consideration on shielding failure and back flashover through lightning fault analysis within the country (국내에서 발생한 낙뢰고장 분석을 통한 직격뢰 및 역섬락 고찰)

  • Choi, Han-Yeol;Min, Byeong-Wook;Park, Soon-Kyu;Lee, Bong-Hee;Gu, Sung-Wan
    • Proceedings of the KIEE Conference
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    • pp.280_281
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    • 2009
  • The past 3 years study on the lightning faults data shows that the main reason is shielding failure rather than back flashover. Accordingly, we need to thoroughly consider about shielding failure angle of tower. Also, transmission line damage caused by shielding can be minimized if we avoid the steep slope area as a transmission line route.

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Comparison of Harvesting Productivity and Cost of Cable Yarding Systems (가선집재작업에서의 작업 생산성 및 비용 분석)

  • Han, Won Sung;Han, Han-Sup;Kim, Nam-Hun;Cha, Du Song;Cho, Koo Hyun;Min, Do Hong;Kwon, Ki Cheol
    • Journal of Korean Society of Forest Science
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    • v.103 no.1
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    • pp.87-97
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    • 2014
  • This study was conducted to provide field-based harvesting study information which can be used to select an optimal cable system for certain work conditions on steep grounds (> $20^{\circ}$ ground slope) in Korea. To accomplish this study objectives, we evaluated three cable yarding systems (RME-300T tower-yarder, Chuncheon tower-yarder, FARMI tractor winch) working in typical work conditions for their yarding productivity and operational efficiency. Those yarders are commonly used for removing logs or trees on steep grounds in Korea. Under the same work conditions (average DBH of tree to be cut, 20 cm; yarding distance, 60 m; lateral yarding distance, 10 m; and machine utilization rate, 70%), the average productivities were $33.04m^3$/day, $38.47m^3$/day, and $14.17m^3$/day for RME-300T, Chuncheon tower-yarder, and FARMI, respectively. Our standardized cost comparison study also showed that the yarding cost was highest at $37,835won/m^3$ with FARMI, followed by RME-300T at $25,105won/m^3$ for the same work conditions. We found the lowest yarding cost with the Chuncheon tower-yarder at $20,520won/m^3$ which was resulted primarily from high yarding productivity at the yarding distance (60 m). Our analysis suggested that a small machine such as FARMI could be a low-cost yarding machine option for a cable yarding job with a short yarding distance (40 m or less). The Chuncheon tower-yarder is well suited for a mid-range yarding distance job in Korea, ranged between 40 to 140 m. If yarding distance were longer than 140 m, the RME-300T tower yarder appears to be most cost-effective.