scholarly journals Methodology of Planning the Course of the Cumulative Cost Curve in Construction Projects

2020 ◽  
Vol 12 (6) ◽  
pp. 2347
Author(s):  
Jarosław Konior ◽  
Mariusz Szóstak
Keyword(s):  
Construction Projects ◽  
Construction Project ◽  
Cost Curve ◽  
Cumulative Cost ◽  
Implementation Time ◽  
S Curve ◽  
Real Costs ◽  
Over Time ◽  
Construction Works

Appropriate planning and effective monitoring of the execution of construction projects is important with regard to their successful sustainment of implementation. Time and cost are key elements that determine the success or failure of construction projects. The obtaining of a rational S-curve course before the start of a construction project that reflects reality is important for all the participants involved in implementing an investment task. The article proposes an original methodology for planning the course of the cumulative cost curve in construction projects. It uses a method of shaping the S-curve, which is well-known in both literature and practical approaches. On the basis of the authors’ own research carried out in a homogeneous research group of hotel facilities, the areas of the curve for the correct planning of costs in construction projects were designated, which determine the boundaries of the predicted costs accumulated over time. The data for the development of the authors’ research methodology is the result of the authors’ own experience and professional work. The authors carried out Bank Investment Supervision in the years 2006–2019 on behalf of the banks that grant investment loans for non-public contracts. Knowing the total cost and duration of the planned construction project, which were determined on the basis of project documentation, cost estimates, and also their own database regarding planned and completed deadlines and budgets of similar investments, 6th degree polynomials of the real costs of the construction works were determined. This approach enabled the correct planning of costs over time and the determination of planned monthly amounts of construction works to be executed.

scholarly journals The S-Curve as a Tool for Planning and Controlling of Construction Process—Case Study

2020 ◽  
Vol 10 (6) ◽  
pp. 2071 ◽  
Author(s):  
Jarosław Konior ◽  
Mariusz Szóstak
Keyword(s):  
Construction Projects ◽  
Construction Project ◽  
Careful Analysis ◽  
Construction Site ◽  
Construction Process ◽  
Financial Flows ◽  
Cumulative Cost ◽  
S Curve ◽  
Construction Works

One of the key tasks of an investor and a contractor at the stage of planning and implementing construction works is to measure the progress of execution with regard to the planned deadlines and costs. During the execution of construction works, the actual progress of the works may differ significantly from the initial plan, and it is unlikely that the construction project will be implemented entirely according to the planned work and expenditure schedule. In order to monitor the process of deviations of the deadline and the budget of the investment task, several rudimentary methods of planning—as well as the cyclical control of the progress of construction projects—are used. An effective tool for measuring the utilization of the financial outlays of a construction project is the presentation of the planned financial flows on a timeline using a cumulative cost chart, the representation of which is the S-curve. The purpose of this paper is to analyze the course of an sample construction project comparing the planned costs of the scheduled works with the actual costs of the performed works, as well as identifying the reasons leading to the failure to meet the planned deadlines and budget of the project implementation. As part of the research conducted at a construction site of a hotel facility, the authors of this paper analyzed each of the 20-month effects of financial expenditures on construction works that were developed and processed by the Bank Investment Supervision (BIS) over a period of three years (between 2017 and 2019). Based on these results, charts and tables of the scheduled and actual cumulative costs of the completed construction project were prepared, the careful analysis of which enables interesting conclusions to be drawn.

Modeling of the harmonization method for executing a multi-unit construction project

2019 ◽  
Vol 9 (1) ◽  
pp. 282-291 ◽  
Author(s):  
Michał Tomczak
Keyword(s):  
Construction Industry ◽  
Construction Projects ◽  
Construction Project ◽  
Optimization Method ◽  
Linear Processes ◽  
Project Duration ◽  
Construction Enterprises ◽  
Non Linear ◽  
Implementation Time ◽  
Selection Of

AbstractOne of the key problems in managing the realization of a construction project is the selection of appropriate working crews and coordinating their activities in a way that ensures the highest degree of implementation of defined goals (minimizing the project duration and/or reducing downtime and related costs). Most of the existing methods of work harmonization used in construction industry allow obtaining the desired results only in relation to the organization of the processes realization in repetitive linear projects. In case of realization of non-linear construction objects or construction units, it is usually necessary to choose between the reduction of the project implementation time and maintaining the continuity of crews work on the units. It was found that there is a lack in the literature of developed method enabling harmonization of crews’ work, while minimizing the downtime at work and the duration of the entire project taking into account additional constraints, e.g. the need to not exceed the deadlines for the realization of the project stages.The article presents the concept of a multi-criteria optimization method of harmonizing the execution of non-linear processes of a multi-unit construction project in deterministic conditions. It will enable the reduction of realization time and downtimes in work, taking into account the preferences of the decision maker regarding the relevance of the optimization criteria. A mathematical model for optimizing the selection of crews and order of completion of units in multi-unit construction projects was also developed. In order to present the possibility of usage of the developed concept, an example of the optimal selection of crews and their work schedule was solved and presented. The proposed method may allow for better use of the existing production potential of construction enterprises and ensure synchronization of the crews employed during the work, especially in the case of difficulties in acquiring qualified staff in construction industry.

Critical Safety Factors in Construction Projects

2011 ◽  
Vol 255-260 ◽  
pp. 3921-3927 ◽  
Author(s):  
Gholamreza Heravi ◽  
Hamed Nabizadeh Rafsanjani
Keyword(s):  
Construction Projects ◽  
Safety Management ◽  
Construction Project ◽  
Limited Resources ◽  
Safety Engineering ◽  
Safety Factors ◽  
Work Related ◽  
Definition Of ◽  
Project Lifecycle

Safety is very important aspects of construction projects which are the most hazardous endeavors have many work-related injuries and accidents. Accordingly, safety factors must be considered in project lifecycle from beginning of a project to its end. To improve project safety, the definition of safety factors and determination of their importance are necessary. In some of the previous researches several safety factors are introduced. In this paper, safety factors in construction project are reviewed and categorized as well as an exhaustive classified catalogue of critical safety factors in construction project which don't have unnecessary details is developed. The identification of the critical safety factors which are categorized in four main groups consists of safety approach, safety engineering, safety management and safety on construction site will enable appropriate allocation of limited resources.

scholarly journals ANALISA FAKTOR-FAKTOR YANG MEMPENGARUHI PENERAPAN MANAJEMEN WAKTU PADA PROYEK KONSTRUKSI JALAN DI KOTA SAWAHLUNTO

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Abadi Palusia
Keyword(s):  
Time Management ◽  
Research Method ◽  
Construction Projects ◽  
Quantitative Research ◽  
Construction Project ◽  
Road Construction ◽  
Timely Completion ◽  
Road Project ◽  
Road Projects ◽  
Construction Works

Currently, many road projects are performing poorly for timely completion, an analysis of time road project implementation needs to be done on the contractor company, so that it can be known that the shortcomings and weaknesses done so far, which later can be an input for contractor, to be even better in the implementation of time management of a road construction project. In 2017 many packages of road construction works in Sawahlunto City. The purpose of this study is to determine the factors that affect the implementation of time management of road construction projects in Sawahlunto. The research method used is quantitative research method by spreading questionnaires to the respondents involved in road construction project in Sawahlunto City. Kata Kunci : Time Management, road, late

Faktory opóźnień

BUILDER ◽  
2019 ◽  
Vol 259 (2) ◽  
pp. 26-28
Author(s):  
Agnieszka Leśniak ◽  
Grzegorz Piskorz
Keyword(s):  
System Design ◽  
Delivery System ◽  
Construction Projects ◽  
Construction Project ◽  
Project Delivery ◽  
Design Stage ◽  
Traditional System ◽  
Design Bid Build ◽  
Construction Works

Identification and rank of delay factors in construction projects depending on the project delivery system . The implementation of construction projects depends on many unpredictable factors, which can cause delays in construction works. The article proposes classification of the validity of delaydepending on the project delivery system. Two of them were considered: the traditional system (Design – Bid – Build), where the design stage is separated from the construction stage and the design and build (Design & Build), which consists in entrusting design works and carrying out works to one contractor. The order of validity is based on results of research carried out among participants of the construction project.

scholarly journals PRODUKTIVITAS PEKERJA DALAM PEKERJAAN PEMASANGAN DINDING BATA DENGAN METODE CREW BALANCE CHART

2020 ◽  
Vol 3 (3) ◽  
pp. 497
Author(s):  
Eddy Putra ◽  
Hendrik Sulistio
Keyword(s):  
Data Collection ◽  
Construction Projects ◽  
Construction Project ◽  
Field Conditions ◽  
Brick Wall ◽  
Collection Data ◽  
Increase Productivity ◽  
Wall Construction

The determination of the magnitude of value of productivity is the first step that must be conducted to determine magnitude of increase productivity that can be applied in construction projects. The determination of value of productivity requires the completeness of data obtained from workers data collection. Data collection displayed in form of Crew Balance Chart to get unproductive time and coefficient of workers based on field conditions in the installation of brick and to increase the productivity of workers on construction project of Residential Houses Cempaka Baru. Methods of data collection using observations in the field, as well as the data processed by using simple math. From the results of the research known to time is unproductive time of workers on the job installation of brick wall construction projects Cempaka Baru on front area is 9,711%, and on back area is 48,737% so it can be called that workers in the front area is quite productive while the workers in back area tend to be not productive. The productivity of workers front area amounted to 0,98 m2/h while productivity in ideal conditions can reach 1,33 m2/h, while that for back area the productivity 1,53 m2/h while productivity ideally 2,25 m2/h.ABSTRAKPenentuan besarnya nilai produktivitas merupakan langkah awal yang harus dilakukan untuk mengetahui besarnya peningkatan produktivitas yang dapat diterapkan dalam proyek konstruksi. Penentuan nilai produktivitas memerlukan kelengkapan data yang didapat dari pendataan pekerja. Pendataan pekerja ini ditampilkan dalam bentuk diagram Crew Balance Chart untuk mendapatkan waktu tidak produktif dan koefisien pekerja berdasarkan kondisi lapangan dalam pekerjaan pemasangan dinding bata serta dapat meningkatan produktivitas pekerja pada proyek konstruksi Rumah Tinggal Cempaka Baru. Metode pengumpulan data dalam crew balance chart menggunakan observasi di lapangan, serta data diolah dengan menggunakan matematika sederhana. Dari hasil penelitian diketahui waktu tidak produktif pekerja pada pekerjaan pemasangan dinding bata proyek konstruksi Cempaka Baru pada area depan 9,711% dan pada area belakang 48,737% sehingga dapat dapat disebut pekerja pada area depan cukup produktif sementara pekerja pada area belakang cenderung tidak produktif. Produktivitas pekerja pada area depan sebesar 0,98 m2/jam sedangkan produktivitas dalam kondisi ideal dapat mencapai 1,33 m2/jam, sementara itu untuk area belakang produktivitasnya sebesar 1,53 m2/jam sedangkan produktivitas idealnya 2,25 m2/jam.

scholarly journals Random And Fuzzy Measure Of Unpredictable Construction Works

2015 ◽  
Vol 61 (3) ◽  
pp. 75-88 ◽  
Author(s):  
J. Konior
Keyword(s):  
Construction Projects ◽  
Construction Project ◽  
Fuzzy Sets Theory ◽  
Random Event ◽  
Lump Sum ◽  
Random Character ◽  
Subjective Aspect ◽  
Sets Theory ◽  
Linear Manner ◽  
Construction Works

Abstract Supplementing well recognised practical models of project and construction management, based on probabilistic and fuzzy events may make possible to transfer the weight of the change and extra orders assessment from the qualitative form to a quantitative one. This assessment, however, is naturally burdened with an immeasurable, subjective aspect. Elaboration of probability of occurrence in a construction project unforeseen building works requires application (in addition to the non-measureable, qualitative criteria) of measurable (quantitative) criteria which still appear during construction project implementation. In reimbursable engineering contracts, a random event described as an extra, supplementary building work has a random character and occurs with a specific likelihood. In lump sum contracts, on the other hand, such a random event has a fuzzy character and its occurrence is defined in a linear manner by the function of affiliation to the set of fuzzy events being identical with unforeseen events. The strive for quantitative presentation of criteria regarded by nature as qualitative and the intention to determine relations between them led to the application of the fuzzy sets theory to this issue. Their properties enable description of the unforeseen works of construction projects in an unambiguous, quantitative way.

Safety climate as a relative concept

2018 ◽  
Vol 25 (3) ◽  
pp. 298-316 ◽  
Author(s):  
Rita Peihua Zhang ◽  
Payam Pirzadeh ◽  
Helen Lingard ◽  
Steve Nevin
Keyword(s):  
Construction Projects ◽  
Safety Climate ◽  
Construction Project ◽  
Processing Plant ◽  
Group Level ◽  
Content Type ◽  
Project Completion ◽  
Starting Point ◽  
Change Trend ◽  
Over Time

Purpose The purpose of this paper is to use a longitudinal approach to measure safety climate at construction projects, and explore the relationship between safety climate and the level of project completion in the dynamic construction project environments. Design/methodology/approach Multi-wave safety climate surveys were conducted at four processing plant construction projects in New Zealand. Safety climate was measured with a multi-level measurement instrument, which measured construction workers’ perceptions of client’s organisational safety response (COSR), principal contractor’s organisational safety response (PCOSR), supervisors’ safety response (SSR) and co-workers’ safety response (CWSR). Findings At the organisational level, the research identifies a general downward change trend in workers’ perceptions of COSR and PCOSR. At the group level, no clear or consistent change trend is identified between the level of project completion and workers’ perceptions of SSR and CWSR. Research limitations/implications The research suggests that the construction project management should consistently emphasise the importance of safety, even when they are facing production pressure. The research highlights the opportunity to examine the role of supervisors’ leadership as an antecedent to the group-level safety climate and the development of workers’ safety concerns for their co-workers over time. Originality/value This research provides the starting point for understanding safety climate in the dynamic and constantly changing construction project environments, in which the relative priorities change, adverse events arise and production pressures fluctuate over time.

scholarly journals Significance Risks Evaluation of Commercial Construction Projects

2019 ◽  
Vol 65 (2) ◽  
pp. 19-33 ◽  
Author(s):  
J. Konior
Keyword(s):  
Construction Projects ◽  
Construction Project ◽  
Feasibility Studies ◽  
Technical Documentation ◽  
Earned Value ◽  
Execution Plan ◽  
Project Appraisal ◽  
Handover Procedure ◽  
And Performance ◽  
Construction Works

AbstractThe main objective of the article is to present quantified and measurable risks likelihood appearance, impact and significance of inspected and monitored 48 commercial construction projects and their feasibility to be carried out. Original technical, financial and organisational feasibility studies in compliance with a rigorous Bank Investment Supervision requirements have been executed by the author in the period of 2005 – 2018. Methodology of construction project appraisal for financing and execution professional preparation have been laid out – technical documentation, arrangements, realisation. Analysis and assessment of Bank Investment Supervision consisted of project execution plan PEP, geotechnical and environmental conditions, permit design, agreements and decision impacts of local authorities, engineering contract for construction works, project insurance and performance bonds, schedule of execution tasks and their costs, payment plan, investment budget and project economical effectiveness, scope of monthly construction works execution assessed by Earned Value Method approach and handover procedure of construction project. An attempt was made to express numerically the relationship between risks impacts and their level of likelihood. Also, a method of associating the influence of projects risks impacts on the extent of the likelihood of project risk occurrence which makes possible to determine the direction and the strength of this relationship was presented. Finally, risks likelihood appearance, impact and significance variability of commercial construction projects within last two years of booming investment industry have been determined.

scholarly journals Production Cost Operation of Some used Machines During the Construction Works in the Republic of Benin

2021 ◽  
Vol 23 (1) ◽  
pp. 55-90
Author(s):  
Quirin Engelbert Ayeditan Alaye ◽  
◽  
Hadilou Michel Alaye ◽  
Keyword(s):  
Production Cost ◽  
Operating Cost ◽  
Construction Project ◽  
Correction Coefficient ◽  
Actual Production ◽  
Republic Of Benin ◽  
The Republic ◽  
Job Site ◽  
Construction Works

The aim of this research is to determine appropriate correction coefficient of production machine to be considered during the construction of pavement in Republic of Benin. Given that reliable construction project should be in accordance with appropriate services and workmanship, this research proposes a method to be followed for the choice of machines according to the nomenclature of all the tasks necessary for the construction of a pavement. Then, a method for determining the actual production of machinery to be used on the job site while listing some factors to consider in determining prices. Based on the maximum theoretical production of the machines used during construction works, this research shows that improving the soil’s performance depends on the quality and the machines’ performance. Additionally, the results show that, the machines’ theoretical productions must be corrected by appropriate factors linked to the conditions under which the works will be executed. Consequently, for a reassuring determination of the machines’ operating cost, this research proposes that the machines to be used will work under challenging conditions.

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