Abstract
The Publication contains the results of research on the problem of resources provision perfecting of erection processes of railway bridges including consideration of forecasting demand questions to material resources, formations of delivery schedules of materials and designs, definitions of insurance reserves in regards to suppliers of material and technical production.
Highlights
The main purpose, which is pursued at planning of resources' provision of construction of railway bridges, is in such synchronisation of building schedules with the delivery schedules of stored resources which would supply enough high stability of timetables with minimisation of combined costs of bridge erection enterprise on the content of reserves, deliveries, losses owing to deficiency in materials and designs
Reduction of temporary reserving of receipt of stored resources lowers the expenditures of construction company on their content
The main part of these expenditures is accounted for by the expense connected with increase of building period of bridges; р” is size of expenditures owing to delayed supplying by storage resources not dependent from duration of the deficiency; р”(хτ)Р(х) is expenditures because of delay of delivery of materials on (х-τ) time units and not dependent from duration of the deficiency; w(τ) is total average costs, the appropriate to temporary reserving of influx of resources, needed for performance of given work in the amount, equal τ
Summary
The main purpose, which is pursued at planning of resources' provision of construction of railway bridges, is in such synchronisation of building schedules with the delivery schedules of stored resources which would supply enough high stability of timetables with minimisation of combined costs of bridge erection enterprise on the content of reserves, deliveries, losses owing to deficiency in materials and designs. The problem of plan formation of material security for construction of railway bridges can be reduced to the task of search of optimum reserving of receipts of resources in view of stability of timetable, periodicity of receipts, reliability of suppliers. Where: W1 is expenses, the appropriate strategies of forecasting of demand of construction company in material resources; W2 is expenditures on the content of current reserve and deliveries of resources; W3 is expenses on time reservation accounting reliability of suppliers. On the third phase is corrected received delivery schedule in view of suppliers reliability
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