John Tookey

Expanding the meaning of standardisation within construction processes

Discusses the effectiveness of construction practices on standardisation based on six case studies developed both in Brazil and in the UK, focusing on the “bricklaying” process. The case studies showed a paradox: construction companies developing written standards but failing to implement and maintaining standard practices. Written standards were extremely ineffective in the case studies due to the lack of teamwork and problem solving activities. It became clear that the abstract meaning of standardisation has far larger possibilities than simply developing descriptions of practice in written documents. Information on standards could be displayed in the packing system or equipment, for instance. Most importantly, information on standard procedures should be available when and where the construction worker needs it, despite the great need for workstation mobility. Hence, concludes that there is an urgent need for promoting a more widespread use of “visual management” approaches in order to enable effective dissemination and use of standard practices within the construction environment.

Demand Uncertainty in Construction Supply Chains: A Discrete Event Simulation Study

The delivery of construction projects is typically an assembly operation involving a high number of subassemblies and materials brought on site by the supply chain. However, although supply chain management in construction has attracted significant attention, paradoxically little focus has been placed on construction supply networks and operations. This paper places emphasis on supply chain operations by looking at the logistics function of construction material suppliers. Specifically, the paper examines the impact of demand uncertainty on supply chain performance in order to assess the capacity of material distribution companies to provide a timely and cost-efficient service to the construction industry. The study adopts a discrete event simulation approach to assess the impact of demand fluctuations on two crucial logistics performance measures; lead time and cost efficiency. The results show that lead times are particularly sensitive to fluctuations under conditions of low demand. The findings also reveal that, although transport is a significant cost element for lower demand levels, higher inventory costs result in a negative exponential relationship between increasing demand and cost efficiency.

Flow modelling of construction site materials and waste logistics

Purpose – The purpose of this paper is to determine the nature and extent of the current practice of logistics in the construction industry and to investigate the utility of reverse logistics in a construction context.Design/methodology/approach – A pilot study was utilised to devise a method for the identification and measurement of parameters for incorporation within a process of construction site logistics optimisation. Data on vehicular movements were collected from seven sites in Cape Town. The data were used to design a flow model of material delivery and waste removal vehicular movements.Findings – The results showed that in terms of transport distribution, of all vehicle movements observed, 62.6 per cent were classified as material delivery and 26.3 per cent as construction and demolition (C&D) waste removal. This ratio approximates to 2.4 materials delivery journeys to one waste removal journey. An optimised integrated materials delivery and waste removal logistics model is presented.Practical im...

State of the art of rainwater harvesting systems towards promoting green built environments: a review

Water scarcity, imperfect consumption patterns, rapid global population increase, surpassing consumption ratio, and several further factors overstress the urging necessity to systematically access and utilize supplementary and most importantly renewable water supply resources. Moreover, application of suitably designed and well-maintained rainwater harvesting systems within the context of the built environment while generalizing the focus on diverse building typologies is promoted as a promising resolution to these systemic issues. Despite the numerous positive benefits of utilizing rainwater harvesting as a means of supporting sustainable development and green built environments, there exists a gap in properly integrating these design features to deliver congruent sustainable outcomes. Accurate design and configuration, simulation, localization, and imposing proper maintenance schemes are expected to be followed in order to accomplish the ultimate goal of executing rainwater harvesting systems. Besides the inevitable noteworthy role of governments in educating, providing prospects and supporting these decentralized water supply and consumption systems is encouraged. Ultimately, this paper provides an overview on the contemporary rainwater harvesting systems, the respective implications and systematic configurations, quality assessments, the potential of rightfully merging them with green roofs and green built environment criteria, and eventually manipulated government regulation to provide insights for overcoming the aforementioned intensifying rainwater-related concerns.

Construction procurement : redefining the contours of organizational structures in procurement

Today there are a number of different types of procurement routes available for clients to choose from. Each different type of procurement (traditional, design and build, management, etc.) has its own proponents and inherent strengths and weaknesses. Selection of optimal procurement systems is difficult, because even experienced clients cannot know all the potential benefits or risks for each system. Procurement is, therefore, a succession of ‘calculated risks’. Industry and academia have focussed research on reducing procurement risk through better procurement-system selection methods. Current research considers procurement as a set of rationalistic decisions within a closed environment, aiming to produce generic, prescriptive rules for clients and advisers to use to select the ‘best’ procurement route for their project. This paper seeks to identify whether prescriptive procurement guidance was adhered to on a set of case study projects. It was found that clients usually selected appropriate procurement systems, and where an inappropriate system was selected, alterations were made in contract form to incorporate aspects of the ‘best’ procurement route.

Estimating transaction costs in the New Zealand construction procurement

Purpose – Within construction procurement, transaction cost economics offers a mechanism to understand “unseen” costs associated with the pre- and post-contract work. Pre-contract, these include costs related to information gathering and procurement. Post-contract they include activities of contract administration and enforcement. The purpose of this paper is to estimate the magnitude of transaction costs (TCs) for different procurement systems used in construction projects in New Zealand. Specifically estimating the relative values of TCs for Traditional and Design-Build delivery systems for the purpose of comparison. Design/methodology/approach – This study develops a conceptual model for the relationship between procurement systems and TC. The model was operationalized and developed into a questionnaire. A cross-sectional sample approach was deployed, involving pilot and survey questionnaires, and results verification through “real world” cases. Data were sought from construction professionals in manag...

CONCURRENT ENGINEERING: A COMPARISON BETWEEN THE AEROSPACE AND CONSTRUCTION INDUSTRIES

The construction industry in the UK has been subject to frequent reports over recent years, all focusing on perceived inefficiencies within the industry and how processes can be improved to deliver construction projects on time, and within cost and quality targets. Most notable of these reports have been Latham (1994) and Egan (1998), which contend that construction should come closer to manufacturing in design, development and supply chain practices to achieve ambitious improvement targets. The most frequently mentioned industries for such “benchmarking” are the aerospace and automotive industries. Concurrent Engineering (CE) appears to offer significant potential to the construction industry as a means to achieve these targets. This paper identifies key aspects of CE practice in aerospace manufacturers and, in the spirit of the Egan report, possibilities for their adoption in UK construction projects.

Home owners and developers relationships: exploring the cordiality factor

Purpose – The cordiality of the relationship between home owners and house developers is significant in the house building sector. This plays a key role in meeting needs, expectations and overall satisfaction. Home owners’ satisfactions are very often dependent on their encounters and experiences with the building organisations they deal with. The purpose of this paper is to explore home owners’ satisfaction to the quality of their new homes by investigating the relationships between them and their house developers when they take possession of their properties. Design/methodology/approach – Two distinct lines of investigation were conducted, with the first utilising mail questionnaires administered to new home owners. The second involved interviews with house building developers. Both investigations cover five main regions in New Zealand. However, this study reports the mail questionnaire survey. The data analysis is based on 216 new home owners, and the results presented using descriptive and correlation...

Addressing effective construction logistics through the lens of vehicle movements

Purpose – Construction logistics is an essential part of construction supply chain management (CSCM). However, limited attention has been paid to this issue in the New Zealand construction industry. The purpose of this paper is to contribute to the knowledge about what hampers efficiency in transporting construction materials and plants to a construction site. The intention is to gain detailed understanding of the practice and obstacles in efficient construction logistics and thus identify interventions to improve logistics efficiency, especially using the numbers of vehicle movements to the construction site as an indicator. Design/methodology/approach – A case study approach was adopted with on-site observations and interviews. Observations were performed during constructions on-site from the start of construction to “hand-over” to the building owner. A selection of construction suppliers and subcontractors involved in the studied project were interviewed. Findings – Data analysis suggested that cost-re...

Amplifying the practicality of contemporary building information modelling (BIM) implementations for New Zealand green building certification (Green Star)

Purpose Green Star is becoming a broadly accepted mark of design quality and environmental sustainability. Compared to other green tools, Green Star is considered as one of main streams green assessment tools, which cover almost sustainable criteria. Simultaneously, building information modelling (BIM) has also been introduced into the industry. BIM is expected to aid designers to shift the construction industry towards more environmentally and economically sustainable construction practice. Whilst the aspirations of Green Star rating and BIM implementation are broadly aligned, in the context of New Zealand this has led to some disconnects in design strategy and process. The purpose of this paper is to improve the practicality of BIM implementations for delivering Green Star certification in New Zealand. Design/methodology/approach The extensive literature review is conducted through a series of incremental steps. A conceptual framework focussing on the relationship between benefits and challenges of BIM and Green Star is then developed. Findings BIM supports practitioners to achieve the majority of Green Star criteria (75 per cent). Energy efficiency criterion is the key factor affecting the assessment process of Green Star and National Australian Built Environment Rating System in New Zealand. Research questions about lessening the challenges which can be encountered during the BIM and Green Star implementation are developed. Research limitations/implications This paper is limited to a conceptual research. Further empirical research should be conducted to validate and modify the conceptual framework and the propositions presented in this paper to provide an initial insight into BIM and Green Star connectivity within the context of New Zealand. Originality/value This paper provided a clear picture for investors, developers, practitioners about benefits and challenges of BIM and Green Star implementation. The outcomes are anticipated to deliver visions for shifting the country further towards development of sustainable future cities.