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Article
Publication date: 7 September 2012

Sarbjeet Singh and Sunand Kumar

The purpose of this paper is to evaluate the effect of main parameters and their interactions on the workers' Lifting Index in a steel rolling mill.

Abstract

Purpose

The purpose of this paper is to evaluate the effect of main parameters and their interactions on the workers' Lifting Index in a steel rolling mill.

Design/methodology/approach

NIOSH (National Institute for Occupational Safety and Health) lifting equation has been used to evaluate the risk of lifting tasks with respect to low back injury under varying load (10, 15, 20 kg), frequency (2, 3, 4 lifts/min), and twisting angle (0, 30, 45 degree).

Findings

The level of importance of the parameters on lifting index at origin and destination has been determined using analysis of variance (ANOVA).The analysis draws on lifting parameters and uses both main effects and interactions to describe the variation in Lifting Index and to identify the social influence associated with back injury. The interactions between object weight and twisting angle and object weight and lifting frequency turn out to be significant (p<0.05), whereas the interaction between twisting angle and lifting frequency is less significant (p=0.061).

Research limitations/implications

The study includes a specific location (steel rolling mills located in Jammu region of India) only.

Practical implications

The findings suggest that focus should be made on all lifting parameters, rather than sole emphasis on the load to be lifted.

Originality/value

The paper supports the view that load, twisting angle and lifting frequency greatly influence the physical stressfulness of the task. It is suggested that the workplace should be designed for negligible twisting and moderate lifting frequency, so as to have minimum Lifting Index.

Details

Journal of Manufacturing Technology Management, vol. 23 no. 7
Type: Research Article
ISSN: 1741-038X

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Article
Publication date: 1 October 2004

Osama Moselhi, Sabah Alkass and Mohamed Al‐Hussein

This paper provides an overview of a recently developed system for selecting and locating mobile cranes on construction sites. The proposed system provides direct help on…

Abstract

This paper provides an overview of a recently developed system for selecting and locating mobile cranes on construction sites. The proposed system provides direct help on two fronts: cost and time savings, and improved safety arrangements. The system has a number of interesting features: a relational database designed to store the cranes' geometry‐related variables and to present them using powerful graphics; a selection module supported by an algorithm designed to satisfy geometrical requirements and necessary clearances, accounting for site constraints and lift configurations; and 3D animation to facilitate the planning of crane operations. The system provides a near‐optimum selection of crane lift configurations, considering available cranes. This paper focuses mainly on case examples to demonstrate and to illustrate the use and capabilities of the developed system. Two actual cases, featuring different site constraints and lift configurations, are presented. In these cases, cranes were selected and their operations planned using the developed system. The findings of the two cases are discussed and the benefits of the proposed methodology are highlighted.

Details

Engineering, Construction and Architectural Management, vol. 11 no. 5
Type: Research Article
ISSN: 0969-9988

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Article
Publication date: 1 December 1962

THE ability of an aircraft to take‐off and land vertically can be achieved by a number of design techniques. Those currently favoured vary from the use of a large rotor…

Abstract

THE ability of an aircraft to take‐off and land vertically can be achieved by a number of design techniques. Those currently favoured vary from the use of a large rotor (as in the helicopter) through propeller‐driven tilting wings and large ducted fans to small jet lift engines. Three major design parameters which affect the final choice of technique arc take‐off and hovering efficiency, cruising flight efficiency (involving, as it may do in the case of helicopters, limitations on forward speed) and the velocity of the lifting jet which will influence noise level and ground erosion problems. The use of the tilting wing, rotor, and to a lesser degree ducted fans places a comparatively severe restriction on the performance of aircraft required for military operations at high speeds and high altitudes, and consequently the turbojet lifting engine appears to offer the best solution to the vertical take‐off and landing problem for this type of application.

Details

Aircraft Engineering and Aerospace Technology, vol. 34 no. 12
Type: Research Article
ISSN: 0002-2667

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Article
Publication date: 1 April 1991

Simon Gray

Offers guidance on how to achieve proper maintenance of buildinglifts. Details equipment audit and the maintenance contract. Discusseslift operations, performance…

Abstract

Offers guidance on how to achieve proper maintenance of building lifts. Details equipment audit and the maintenance contract. Discusses lift operations, performance measurement, user requirements and insurance and legal requirements. Finally looks at remote and third party monitoring.

Details

Property Management, vol. 9 no. 4
Type: Research Article
ISSN: 0263-7472

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Article
Publication date: 1 January 1987

Michael Godwin

The subject of lifts covers a wide spectrum from the highly technical to the subjective and emotional response of individuals. This article focuses on a design brief for…

Abstract

The subject of lifts covers a wide spectrum from the highly technical to the subjective and emotional response of individuals. This article focuses on a design brief for groups of passenger lifts suitable for low‐rise buildings where intensive traffic is encountered. What does the building planner in collaboration with his architect need to know?

Details

Facilities, vol. 5 no. 1
Type: Research Article
ISSN: 0263-2772

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Article
Publication date: 1 March 1988

G.D. Honey

Introduction Surveys of lift installations are required for many reasons. In some cases, the frequency of breakdowns and stoppages becomes so great that the occupants of…

Abstract

Introduction Surveys of lift installations are required for many reasons. In some cases, the frequency of breakdowns and stoppages becomes so great that the occupants of the building require the cause to be established by an independent surveyor, who is unconnected with the lift company responsible for maintenance, or with the landlord. There is also the situation where, while there have been numerous breakdowns, the lift service is maintained overall, but with a consequently high maintenance premium, involving a steady stream of bills for repairs and replacement parts. In such cases, it is important to establish that the contractor's claims are justified and that he is not increasing his profits by preying on laymen's limited knowledge.

Details

Structural Survey, vol. 6 no. 3
Type: Research Article
ISSN: 0263-080X

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Article
Publication date: 1 June 2001

Mohamed Al‐Hussein, Sabah Alkass and Osama Moselhi

This paper presents a newly developed algorithm for selecting and locating mobile cranes on construction sites. The algorithm is incorporated into a computer system that…

Abstract

This paper presents a newly developed algorithm for selecting and locating mobile cranes on construction sites. The algorithm is incorporated into a computer system that integrates a selection module and three databases, dedicated respectively, for cranes, rigging equipment, and projects’ information. This paper focuses primarily on the selection module and its algorithm to support an efficient search for most suitable crane configurations and their associated lift settings. Data pertinent to crane lift configurations and settings are retrieved from the databases and processed to determine the near optimum selection of a crane configuration. The developed selection module features powerful graphics capabilities and a practical user‐friendly interface, designed to facilitate the considerations of user imposed lift and site constraints. The selection algorithm has been implemented within the crane selection module using MS‐Visual Basic programming language. A case example is presented in order to demonstrate the use of the developed selection module and to illustrate its essential features.

Details

Construction Innovation, vol. 1 no. 2
Type: Research Article
ISSN: 1471-4175

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Article
Publication date: 1 December 1989

Gerald Honey

Twenty‐five years ago lift installations were almost invariably serviced by the manufacturing company that installed them and although, as is always the case, comprised a…

Abstract

Twenty‐five years ago lift installations were almost invariably serviced by the manufacturing company that installed them and although, as is always the case, comprised a mixture of electro‐mechanical as well as electrical components, the electrical systems were relatively straightforward and within the scope of the servicing engineer.

Details

Facilities, vol. 7 no. 12
Type: Research Article
ISSN: 0263-2772

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Article
Publication date: 1 October 1986

Jonathan R. Beebe

With the falling prices and increasing sophistication of small computer systems the use of computers in the management of large numbers of lifts has become a practical…

Abstract

With the falling prices and increasing sophistication of small computer systems the use of computers in the management of large numbers of lifts has become a practical reality. This article deals with possible changes within existing lift management situations. The planning of new installations will be covered in a future article bringing us another step closer to the intelligent building. The operation of lifts within one or more buildings can be thought of as a hierarchy of functions. At the bottom of the hierarchy, the most basic function is to move a single lift from floor to floor responding to calls registered by passengers. At the next level, that of Group Control, passenger calls on different landing levels are assigned amongst the individual lifts in a group of lifts according to pre‐programmed rules (known as an Algorithm). Lift management is the long term process by which the operation of all the lifts in several groups is optimised and then maintained at a peak of performance. Lift management is thus the top level of the hierarchy and allows the operation of the lifts to be continually ‘tailored’ to the building in which they are located. Without lift management the occupants of the building must ‘tailor’ their requirements to the service provided by the lifts.

Details

Facilities, vol. 4 no. 10
Type: Research Article
ISSN: 0263-2772

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Article
Publication date: 17 July 2020

Qiaolei Sun, Liang He, Ding Feng, Xinlong Chen, Liangliang Ding and Yiliu Tu

As the excessive lifting force can lead to catwalk rollover and well site accidents, the lifting process boundary conditions and structural parameters have a significant…

Abstract

Purpose

As the excessive lifting force can lead to catwalk rollover and well site accidents, the lifting process boundary conditions and structural parameters have a significant effect lifting force, it is important to analysis the structural parameters on the maximum lifting force in the lifting process of power catwalk.

Design/methodology/approach

A new model is proposed to analyze the influence of structure parameters on its lifting force for lifting power catwalk in this paper, and the geometric and dynamic equations are established according to the different boundary conditions in different stages. In addition, the establishment of dynamics equations is based on D'Alembert's principle. To solve the model, dynamic analysis software is developed, which uses c # call MATLAB to solve the geometric and dynamic equations. The maximum lifting force is analyzed and optimized according to the software, the influence of structural parameters on the maximum lifting force is obtained and the correctness of the optimization is proved by experiments.

Findings

The best value of offset e is 0. The length of L22 should as small as possible while the installation size of the end of the conveying arm are guaranteed. The length of L1 should as small as possible while ensuring the not exceed the maximum value. The maximum lifting force remain the same in the second phase, the maximum lifting force decreases with the increase of Lcp, Lcpshould as small as possible. The maximum pressure of the hydraulic oil dropped by an average of 13.62% under optimized parameters.

Practical implications

This paper provides a theoretical basis for the selection of hydraulic winch, which also provides the theoretical basis and data support for the design and optimization of the structural parameters of the power catwalk.

Social implications

This research has industrial applications in SJ Petroleum Machinery CO.LTD, SINOPEC (China) .CANRIG, North Rig, TESCO, Sichuan HONGHUA petroleum equipment CO.LTD of CNPC., Baoji Oil field Machinery CO.LTD, SJ Petroleum Machinery Co. LTD of SINOPEC, Yantai Jereh Oilfield Services Group CO.LTD, Nanyang clips oil equipment (group) CO. LTD, etc are the likely users.

Originality/value

A new model is proposed to analyze the lifting force of lifting power catwalk. The model takes into account the inertia force of the structure, development of dynamics software and analysis and optimization of structural parameters. The maximum lifting force is analyzed and optimized according to the software, the influence of structural parameters on the maximum lifting force is obtained and the correctness of the optimization is proved by experiments.

Details

Journal of Engineering, Design and Technology , vol. 19 no. 1
Type: Research Article
ISSN: 1726-0531

Keywords

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