• 한국기계가공학회지
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• 제10권4호
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• pp.44-49
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• 2011

The crawler crane, which consists of a lattice boom, a driving system, and movable vehicle, is widely used in a construction site. It needs to be installed an overload limiter to prevent the overturning accident and the fracture of structure. This research is undertaken to provide the relation formula for designing the overload limiter as follows: First the relation formulas between the wire-rope tension and the hoisting load or the overturning ratio according to the luffing angle and length of a lattice boom are established. Secondly the derived formulas are corrected by using the compensated angle considering the deflection of boom through the finite element analysis. The stiffness analysis is carried out for 30-kinds of models as a combination of 6-kinds of luffing angle and 5-kinds of length of boom. Finally the shape design of a stick type load cell, which is the device to measure the wire-rope tension, is performed. 5-kinds of notch radius and 5-kinds of center hole radius are adopted as the design parameter for the strength analysis of the load cell.

• 한국기계가공학회지
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• 제20권3호
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• pp.83-91
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• 2021

A crawler crane, which consists of a lattice boom, a driving system, and a movable vehicle, is widely used on construction sites. The crawler crane often traverses rough terrain at these sites; as a result, an overload limiter needs to be installed on the crane to prevent it from overturning and breaking. In this paper, we studied the distributed load change in relation to boom length and the angle of rotation of the roller that comes in direct contact with the grounded track shoe. First, we developed a 3D model of a crawler crane and meshed it for finite elements. Then, we performed finite element analysis to derive the load on the roller. Finally, we graphed and examined the roller distributed load data of the case according to boom length and rotation angle. By detecting the load on the roller of the crawler crane, we can predict the potential for the crane to overturn before it happens.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.77-78
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• 2023

As large logistics buildings have high floor heights and long spans, these buildings are designed as PC structures, and large cranes are used to lift PC members. PC erection planning can generally cause errors depending on the field engineer's experience. To solve this problem, a basic analysis method is needed to establish a systematic PC member erection plan. Crane work can be minimized if the trajectory is easily and quickly calculated according to the location of the crane and applied to the site. Therefore, the objective of this study is a basic study of crane trajectory distance calculation for sustainable PC members erection of large logistic building. In this study, a crawler crane commonly used for lifting PC members is limited. The trajectory distance for the PC erection plan was automatically calculated using the algorithm.

• 한국전산구조공학회논문집
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• 제25권2호
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• pp.119-127
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• 2012

와이어 로프(wire rope)는 여러 가닥의 얇고 긴 철사를 감아서 밧줄과 같이 만든 것으로 굽힘과 비틀림 하중에 비해 축 하중에 더 크게 저항할 수 있는 특징을 가지고 있다. 해상 크레인, 갠트리 크레인, 크롤러 크레인 등과 같이 선박 또는 해양 구조물의 탑재를 위해 사용되는 조선용 탑재 크레인은 이러한 와이어 로프를 이용해 큰 중량의 블록들을 들거나 내리고 있다. 따라서 블록의 안전한 탑재를 위해서는 와이어 로프에 대한 동역학적 특성을 잘 파악해야 한다. 본 연구에서는 블록 탑재 시 크레인의 와이어 로프에 작용하는 장력과 비틀림 모멘트에 대한 계산식을 유도하고, 이를 기반으로 한 조선용 탑재 크레인의 동역학 시뮬레이션을 수행하였다. 그 결과, 개발된 시뮬레이션 방법이 실제 조선소의 안전한 블록 탑재 과정에 충분히 적용할 수 있음을 확인하였다.