• 국제학술발표논문집
• /
• The 3th International Conference on Construction Engineering and Project Management
• /
• pp.1060-1067
• /
• 2009

The selection and operation of tower cranes at construction sites are dependent on the personal experience of engineers in charge of lifting work. It often causes to overestimate the safety factor resulting in increase of construction cost, or underestimate it resulting in disastrous accident. Therefore, selection of tower cranes needs to consider cost, safety and maximum lifting condition. This study, for resolving such problems, was intended to propose the algorithm designed for even the inexperienced person to select the optimal lifting equipment in timely manner. The algorithm presented herein is an optimization algorithm that enables automatic arrangement of tower crane and minimization of costs by analyzing such conditions as vertical height and lifting load, etc.

• 국제초고층학회논문집
• /
• 제9권3호
• /
• pp.301-306
• /
• 2020

In tall building construction, the appropriate control of lifting loads on tower cranes is critical in terms of the construction duration of structural works. The adoption of efficient construction methods can be the most effective way of minimizing the inputs of tower cranes and making a lifting plan and management easier. Based on actual data from a tall building project, this study comparatively analyzes lifting loads of tower cranes by the core structure preceding construction method (CSPCM) and the core structure succeeding construction method (CSSCM). The results revealed that the CSSCM could reduce up to about 56.3% of lifting loads for core works and significantly enhance lifting efficiency compared with the CSPCM. Consequently, this enabled a substantial reduction in the construction duration of structural works. This study provides a practical reference to assist engineers and managers in applying efficient construction methods and lifting equipment operation in tall building projects.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2015년도 추계 학술논문 발표대회
• /
• pp.64-65
• /
• 2015

As construction projects have increased in size and height recently, lifting accounts for increasingly greater portion and tower cranes are used more frequently. At present, the selection and arrangement of tower crane are depend on the experience of experts. However, since the number of experts is fairly limited and a database for tower cranes regarding lifting capacity, operation properties, rent, etc has not been widely employed, tower cranes are often not effectively selected and arranged which can cause cost overruns and delays in the lifting work. To address such issues, this study attempts to perform a basic study for development of automatic arrangement algorithm of tower crane using drawing recognition. If relevant database is established and the algorithm suggested in this study is refined more systematically, even beginning level engineers will be able to plan tower crane arrangement in a way comparable to experienced experts.

• 국제초고층학회논문집
• /
• 제11권2호
• /
• pp.103-114
• /
• 2022

Tower crane is of great importance in the construction of high rise buildings. A self-lifting & slewing multi-cranes platform (referred to as crane slewing platform) was developed to optimize the configuration of tower cranes, as well as solve the problems of cooperative operation conflict between multiple cranes and other construction equipment and their respective climbing and occupying of construction period. The design and test of the slewing platform was introduced. By applying the slewing platform in the construction of Chengdu Greenland Center super high rise building project, some key technologies such as the configuration of cranes, the installation, construction and lifting of the slewing platform are implemented and validated. Up to now, the slewing platform has been safely lifted up 98 times in Chengdu Greenland Center project construction, and achieved good social and economic benefits.

• 한국건설관리학회논문집
• /
• 제8권6호
• /
• pp.216-226
• /
• 2007

건설프로젝트의 고층화, 대형화 추세에 따라 효율적인 양중계획의 중요성이 부각되고 있다. 양중작업의 대부분을 차지하고 있는 타워크레인의 경우, 양중부하에 적합한 최적 크레인을 선정하고 안전성을 확보하는 것은 생산성뿐만 아니라 프로젝트의 원가, 공기 등의 측면에서 매우 중요하다. 따라서 철저한 사전계획에 따라 적합한 크레인을 선정한 후 안전하게 지지하는 일련의 작업은 전문적인 지식을 필요로 한다. 그러나 전문가의 수가 제한적이며, 이들 전문가의 경우에도 다양한 크레인의 양중성능, 운전특성, 임대가 등에 대하여 상세히 알기보다는 본인들이 주로 사용한 제한적 수의 크레인에 대한 정보를 가지고 있을 뿐이다. 따라서 본 연구는 고층공사의 양중계획단계에서 현장조건에 따른 최적 타워크레인을 선정하고 그 안정성을 쉽고 빠르게 검토할 수 있는 선정시스템을 구축하였다. 본 선정시스템은 크레인 선정시 다양한 기종 및 성능에 대한 정보제공은 물론, 해당 크레인의 기초판과 횡지지에 대한 안정성을 실시간으로 비주얼하게 검토할 수 있어 크레인 선정에 효과적인 도구로 사용될 것으로 예상한다.

• 한국건설안전학회 논문집
• /
• 제2권1호
• /
• pp.1-8
• /
• 2019

현재 건축물의 높이가 높아지고 우리나라 가구 형태가 개인 주택에서 아파트로 변화함에 따라 타워크레인의 사용 횟수는 계속해서 증가하고 있다. 그러나 이처럼 증가하는 타워크레인 사용 횟수에 반해 우리나라 타워크레인 관련 정책은 매우 미비한 실정이다. 특히 타워크레인과 관련된 사고의 원인 중 가장 큰 비중을 차지하는 타워크레인 연식에 대한 기준은 그 설정 근거가 부족하다. 따라서 본 연구에서는 이와 같은 문제점에 주목하여 타워크레인의 보다 신뢰성 있는 타워크레인의 연식을 설정하는 연구를 진행한다. 이를 위해 본 연구에서는 기존 연구에서 사용했던 사례와 영국 타워크레인 기준을 바탕으로 사용 연식을 설정한다.

• Advances in Computational Design
• /
• 제4권4호
• /
• pp.343-365
• /
• 2019

Among the themes related to earthquake countermeasures at construction sites, those for tower cranes are particularly important. An accident involving the collapse of a crane during the construction of a skyscraper has serious consequences, such as human injury or death, enormous repair costs, and significant delays in construction. One of the causes of deadly tower crane collapses is the destruction of the site joints of the tower crane mast. This paper proposes a new design method by static elastoplastic finite element analysis using a supercomputer for the design of the end plate-type tensile bolted joints, which are generally applied to the site joints of a tower crane mast. This new design method not only enables highly accurate and reliable joint design but also allows for a design that considers construction conditions, such as the introduction of a pre-tension axial force on the bolts. By applying this new design method, the earthquake resistance of tower cranes will undoubtedly be improved.

• 한국안전학회지
• /
• 제33권1호
• /
• pp.103-108
• /
• 2018

Since tower cranes are susceptible to wind loads, the operation of the tower crane should be ceased when it exposed to a strong wind. For this reason, even in Korea, the operation limit for wind loading on the tower crane is regulated by a law. Recently the Korean law in which provided the wind speed limit to cease the tower crane operation has been revised from "instantaneous wind speed of 20 m/s" to "instantaneous wind speed of 15 m/s". Although this revision is expected to reduce safety risks in tower crane operation, some field operators still insist to lower the wind speed limit. However, in many countries "wind speed of 20 m/s" is normally used as the maximum in-service wind speed for tower cranes. Therefore, the investigation of the proper wind speed for regulation would be helpful to secure the safety of the tower crane operation under windy condition. In this study the validity of the revised wind speed limit is investigated with the surveys targeted to both tower crane practitioners and parties of concerned in construction companies, in which various questions was provided for a suitable wind speed limit and the answers were analyzed. The results showed that the revised wind speed limit is acceptable to tower crane practitioners as well as the parties of concerned in construction companies and is satisfying the structural stability requirement for in-service state tower crane. Therefore, it can be concluded that the revised wind speed limit is valid in humanly safety point of view.

• 한국안전학회지
• /
• 제16권4호
• /
• pp.147-152
• /
• 2001

The tower cranes are the very useful construction machine in the high place works. But they are very susceptible to the load balance, the wind load and the hanging load because they are the very slender structures and those center of gravity is located in the upper part. Therefore, the collapse accidents of tower one have repeatedly happened during the assemble or disassemble works. The correcting frame may has often used in order to correct the error in the setting of foundation anchors. The goal of this study is that propose the methods preventible the collapse accident of tower crane which is constructed by using the correcting frame. In order to accomplish the goal of this study, the field survey, the reference investigation and the structure analysis were performed for the collapse accident of tower crane using the correcting frame. This study result in the methods preventible the same accident.

• 대한토목학회논문집
• /
• 제31권5D호
• /
• pp.705-717
• /
• 2011

타워크레인은 건설현장의 전체 자재인양 중 약 50%의 물량을 인양하는 양중 장비로 그 수는 빠른 속도로 증가하고 있으나, 건설현장에서의 소홀한 안전관리로 타워크레인 관련 안전사고는 매년 지속적으로 발생되고 있는 실정이다. 특히, 텔레스코핑 작업은 타워크레인 설치단계에서 텔레스코핑 케이지를 유압으로 상승시킨 후 생긴 빈 공간에 새로운 마스트를 삽입하여 요구 높이까지 상승시키는 작업으로 고소에서 다수의 작업자가 동시에 작업을 실시하여 추락 및 낙하의 위험성이 존재하는 등 타 작업에 비해 재해사례 비중이 가장 높은 것으로 분석되었다. 본 연구의 목적은 타워크레인 작업 중 특히 위험성이 높은 것으로 조사 및 분석된 텔레스코핑 작업의 안전성 및 생산성을 향상시킬 수 있는 타워크레인 텔레스코핑 자동화기술의 개념모델을 제안하고 이에 대한 안전성 측면에서의 잠재적 성능을 분석함으로써 향후 타워크레인 텔레스코핑 자동화기술 실물 제작을 위한 원천자료를 제공하는 것이다.