Analyses of Instability in Mobile Cranes due to Ground Penetration by Outriggers

Tamate, Satoshi; Suemasa, Naoaki; Katada, Toshitaka

doi:10.1061/(asce)0733-9364(2005)131:6(689)

Cited by 16 publications

(6 citation statements)

References 8 publications

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“…It may also be used to help investigate accidents and develop more effective educational materials. Whereas the modeling analyses of several MEWPs have been reported [7][8][9], the literature review for this study did not find a dynamic model for simulating scissor lift tip-over.…”

Section: Introductionmentioning

confidence: 60%

An Investigation on the Dynamic Stability of Scissor Lift

Dong¹,

Pan²,

Hartsell³

et al. 2012

OJSST

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The tip-over of scissor lifts in operation has frequently resulted in the death and/or severe injuries of workers. The objective of this study is to enhance the understanding of its major mechanisms and factors influencing scissor lift stability. Both experimental and modeling approaches were used in this study. Two series of experiments were performed under possible tip-over scenarios: curb impact and pothole depression. Based on the dynamic characteristics identified from the experimental results, a lumped-parameter model of the scissor lift was developed. It was applied to investigate the effect of scissor structure flexibility on the tip-over potential of the lift, to understand tip-over mechanisms, and to ex-plore preventive strategies. This study found that the fundamental natural frequencies of the lift were generally in a range of 0.30 - 2.08 Hz, which are likely related to the tip-over. Increasing flexibility of the lift structure generally increased the tip-over potential. The tip-over threshold was also a function of both ground slope and tilt speed of the lift. The results suggest that the lift should not be elevated on largely deformable and/or uneven surfaces such as bridged wood board or a soft soil base. The worker on the lift platform should avoid any large continuous periodic movement or forceful action in the horizontal plane, especially when the lift is fully elevated. Besides the tilt angle of the lift, the tilt speed should be monitored to help prevent the tip-over

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Section: Introductionmentioning

confidence: 60%

An Investigation on the Dynamic Stability of Scissor Lift

Dong¹,

Pan²,

Hartsell³

et al. 2012

OJSST

View full text Add to dashboard Cite

show abstract

“…Tamate et al analyzed outrigger loads that cause overturn of mobile cranes. They also conducted an experiment on overturn of mobile cranes as the load is delivered to the outrigger and analyzed the result; however, they did not propose the selection of stability-secured mobile cranes and plate design algorithms like this study (Tamate et al 2005). Shapira et al considered the characteristics of building projects and conducted a study in selecting whether a mobile crane or a tower crane is most suitable.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The case study was carried out to verify the effectiveness of the proposed algorithms. Many researchers have conducted a wide range of studies about mobile cranes such as the implementation of a lifting rout plan program (Reddy and Koshy 2002;Lozano-Pérez and Wesley 1979) and a crane selection algorithm (Al-Hussein et al 2001;Shapira and Schexnayder 1999;Al-Hussein et al 1997;Furusaka and Gray 1984;Gray and Little 1985), the overturn analysis of outriggers (Tamate et al 2005), the friction with other works (Tantisevi and Burcu 2007) and even the development of a dual lifting simulation program. However, they didn't deal with a series of mobile crane management for securing both stability and economy, but dealt with the partial issue of it, whereas this paper covered the principal issues from selecting a proper crane responding to the lifting conditions to reviewing the stability of cranes automatically, followed by the economic design of reinforcement plates.…”

Section: Competing Interestsmentioning

confidence: 99%

Automatic design algorithms for securing the ground contact stability of mobile cranes

Lee

Park

et al. 2014

Vis. in Eng.

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Background: Mobile cranes overturn due to excessive lifting, heavy wind, or when appropriate ground contact pressure is not secured. Such accidents can be prevented by reviewing the force conveyed from the outrigger to the ground upon lifting, as well as the soil bearing force. The stability review of mobile crane overturn is classified into the following stages: reviewing lifting conditions, mobile crane selection and reviewing ground contact stability. However, a precise review of ground contact stability requires expertise and is extremely time-consuming. Thus, this study develops automatic design algorithms for securing the ground stability of mobile cranes for easy and quick stability reviews. Methods: The stability review method and the algorithm models are created in connection with the proposed conceptual process. The algorithms proposed in this study conduct simulations for all possible candidate cases, save the results in a database, review practical alternatives, and select the solution that minimizes cost. To verify the effectiveness of the automatic design model, a case project was selected and the algorithm was applied assuming several conditions. Results: Developed algorithms can select candidate cranes according to lifting conditions and design plates through simulations easily and quickly, and design components required for ground contact plate design are collected to build the database that allows easier and quicker stability review. Conclusion: The algorithms proposed in this study conduct simulations for all possible candidate cases, save the results in a database, review practical alternatives, and select the solution that minimizes cost. Developed processes are useful for analyzing correlations of mobile crane performance, ground contact and soil bearing force reinforcement designs and so forth, and for systematically selecting optimal mobile cranes.

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“…Also, experience has shown that stability of car jack is very important parameter. The stability of the car jack mostly depends on the construction design [3], [4], [5].…”

Section: Introductionmentioning

confidence: 99%

Design and Kinematic Analysis of the Car Jack

Pervan¹,

Muminović²,

Mešić³

et al. 2020

TEM Journal

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Car jack is the basic equipment of every car. To replace the tires or to repair a specific defect on the car it is necessary to have a car jack. A modern way of creating the complex mechanical structures is described in this paper, which allows for rapid change of parameters and therefore of the whole design, i.e. the parameterized car jack model was developed. Also, the goal of this research is to carry out kinematic analysis of a car jack design. Parametric model is developed in such a way that all parameters of design are in correlations to one main parameter. The angle of thread spindle is chosen for main parameter. Usually, main parameter should be chosen as one of the parameters from power input elements. Car jack has a human hand power which is applied on car jack handle and because of that, the angle of rotation of thread spindle is the best for main parameter.

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Analyses of Instability in Mobile Cranes due to Ground Penetration by Outriggers

Cited by 16 publications

References 8 publications

An Investigation on the Dynamic Stability of Scissor Lift

An Investigation on the Dynamic Stability of Scissor Lift

Automatic design algorithms for securing the ground contact stability of mobile cranes

Design and Kinematic Analysis of the Car Jack

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