9.3 Review Results of Construction Cost
9.3.1 General
Based on the preconditions described in Section 9.2 above, review of construction cost for Phase 1 of Bangaraole ELRT was carried out for each field of ELRT systems.
9.3.2 Civil Engineering Structures
(1) General
In this survey, we estimated construction costs according to the following procedure.
(a) The unit cost of site execution of structures of various categories estimated by UBTSL is expressed as "Cost bt".
(b) "Cost bt" is divided into three components: labor (Cbl), machinery depreciation (Cbk) and materials (Cbm). The ratio of each component to total cost is denoted by Rbl, Rbk and Rbm, respecively.
Cost bt = Cbl + Cbk + Cbm
Rbl = Cbl ÷ Cost bt
Rbk = Cbk ÷ Cost bt
Rbm = Cbm ÷ Cost bt
Although in Table 9.2.1-8 the ratios Rbl, Rbk and Rbm are different for guideways and stations, we adopt the ratios of guideways for stations, because work categories in station construction are considered almost the same as those in guideway construction.
(c) The unit costs for labor, machinery and material in Bangalore are signified by UCbl, UCbk and UCbm, respectively.
(d) We calculate the unit cost of execution "Cost jt" assuming the structures are to be constructed in Japan.
To calculate the Cost jt, we adopt instances of railway construction in Japan those are similar to the Bangalore project in terms of design (trapezoidal box PC girder), location (extremely congested streets) and other environmental conditions.
We appropriately modify the calculated unit cost to reflect different periods of construction work and other conditions that are unavoidable despite the above-mentioned efforts to maintain coherence between the two cases.
Cost jt is shown in Table 9.3.2-3 and 9.3.2-4.
(e) Based on Cost jt, we review Cost bt according to the conditions of construction work in Bangalore.
(f) With this approach, the ratios of the costs of labor, machinery and materials (Rbl, Rbk and Rbm) were assumed as the same between Japan and Bangalore, accordingly the values given in Table 9.2.1-8 provided by UBTSL were adopted.
(g) The unit costs of labor (UCji), machinery depreciation (UCjk) and materials (UCjm) in Japan were collected and then unit cost conversion ratios Rut which are expressed by the components
