• Title, Summary, Keyword: 수평 판앵커

Search Result 4, Processing Time 0.064 seconds

Analysis of Ultimate Capacity of Plate Anchor on Loading Rate Capacity in Clay (점토 지반에서 인발속도에 따른 판앵커의 극한 인발저항력 분석)

  • Seo, Young-Kyo;Ryu, Dong-Man
    • Journal of Ocean Engineering and Technology
    • /
    • v.27 no.3
    • /
    • pp.15-21
    • /
    • 2013
  • Anchors are primarily designed and constructed to resist outwardly directed loads imposed on the foundation of a structure. These outwardly directed loads are transmitted to the soil at a greater depth by the anchors. Buried anchors have been used for thousands of years to stabilize structures. Various types of earth anchors are now used for the uplift resistance of transmission towers, utility poles, submerged pipelines, and tunnels. Anchors are also used for the tieback resistance of earth-retaining structures, waterfront structures, at bends in pressure pipelines, and when it is necessary to control thermal stress. In this research, we analyzed the uplift behavior of plate anchors in clay using a laboratory experiment to estimate the uplift behavior of plate anchors under various conditions. To achieve the research purpose, the uplift resistance and displacement characteristics of plate anchors caused by the embedment ratio, plate diameter, and loading rate were studied, compared, and analyzed for various cases.

Concrete-Panel Retaining Wall anti-crack sleeve inserted (균열방지 슬리브가 매설된 패널식 옹벽)

  • Jang, Sung-Ho;Chung, Jee-Seung
    • The Journal of the Convergence on Culture Technology
    • /
    • v.5 no.3
    • /
    • pp.345-349
    • /
    • 2019
  • In Korea, the mountainous area occupies more than 70% of the whole country, cutting of earth slope that cuts a part of the ground surface is widely used when building infrastructures such as road, railroad, and industrial complex construction. In recent years, regulations on environmental damage have become more strict, and various methods have been developed and applied. Among them, Concrete-Panel Retaining Wall technique is actively applied. Concrete-Panel Retaining Wall is a method to resist horizontal earth pressure by forming a wall by attaching a precast retaining wall to the front of the support material and increasing the shear strength of the disk through reinforcement of the support material. Soil nailing, earth bolt, and ground anchor are used as support material. Among them, ground anchor is a more aggressive reinforcement type that introduces tensile load in advance to the steel wire, and a large concentrated load acts on the front panel. This concentrated load is a factor that creates cracks in the concrete panel and reduces the durability of the retaining wall itself. In this study, steel pipe sleeves and reinforcements were purchased at the anchorage of the panel to prevent cracks, and by applying bumpy shear keys to the end of the panel, the weakness of the individual behavior of the existing grout anchors was improved. The problem of degraded landscape by exposure to front concrete of retaining wall and protrusion of anchorage was solved by the production of natural stone patterns and the construction of sections that do not protrude the anchorage. In order to verify the effectiveness of anti-crack sleeves and reinforcements used in the null, indoor testing and three-dimensional numerical analysis have been performed, and the use of steel pipe sleeves and reinforcements has demonstrated the overall strength increase and crack suppression effect of panels.

An Experimental Study on Behavior Characteristics of the Pretension Soil Nailing Systems (프리텐션 쏘일네일링 시스템의 거동특성에 관한 실험적 고찰)

  • Choi, Young-Geun;Shin, Bang-Woong;Park, Si-Sam;Kim, Hong-Taek
    • Journal of the Korean Geotechnical Society
    • /
    • v.20 no.2
    • /
    • pp.87-96
    • /
    • 2004
  • Application of the soil nailing method is continuously extending in maintaining stable excavations and slopes. However, ground anchor support system occasionally may not be used because of space limitations in urban excavation sites nearby the existing structures. In this case, soil nailing system with relatively short length of nails could be efficiently adopted as an alternative method. The general soil nailing support system, however, may result in excessive deformations particularly in an excavation zone of the existing weak subsoils. Pretensioning the soil nails then could play important roles to reduce deformations mainly in an upper part of the nailed-soil excavation system as well as to improve local stability. In this study, a newly modified soil nailing technology named as the PSN (Pretension Soil Nailing) is developed to reduce both facing displacements and ground surface settlements in top-down excavation process as well as to increase the global stability. Up to now, the PSN system has been investigated mainly focusing on an establishment of the design procedure. In the present study, laboratory model tests are carried out to investigate the failure mechanism and behavior characteristics of the PSN system. Various results of model tests are also analyzed to provide a fundamental basis for the efficient design.

Experimental Study for Structural Behavior of Embed Plate into Concrete Subjected to Welding Heat Input (매입강판 용접열에 의한 고강도 콘크리트 접합부 구조성능 영향평가에 관한 실험적 연구)

  • Chung, Kyung Soo;Kim, Ki Myon;Kim, Do Hwan;Kim, Jin Ho
    • Journal of Korean Society of Steel Construction
    • /
    • v.25 no.5
    • /
    • pp.569-578
    • /
    • 2013
  • In a super-tall building construction, thick and large-sized embed plates are usually used to connect mega structural steel members to RC core wall or columns by welding a gusset plate on the face of the embed plate with T-shape. A large amount of heat input accumulated by weld passes causes the plates to expand or deform. In addition, the temperature of concrete around the plates also could be increased. Consequently, cracks and spalls occur on the concrete surface. In this study, the effect of weld heat on embed plates and 80MPa high strength concrete is investigated by considering weld position (2G and 3G position), edge distance, concrete curing time, etc. Measured temperature of the embed plates was compared with the transient thermal analysis results. Finally, push-out tests were performed to verify and compare the shear studs capacity of the embed plate with design requirement. Test result shows that the shear capacity of the plate is reduced by 14%-19% due to the weld heat effect and increased as the concrete curing time is longer.