For the tower crane and construction elevator used in the project, the calculation method of amortization cost can be divided into enterprise owned and leasing
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The depreciation cost of self owned machinery and equipment is calculated, and the leasing method is analyzed according to the market situation
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Because each enterprise is different, each project has different characteristics, and the measurement data is also different
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This paper explains the measurement method through case analysis
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Tower crane and construction elevator should be amortized into the building area in the cost calculation to calculate the calculation index data
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First, the number of machinery used in the project is required, then the amortization price is calculated, and finally the index data is calculated
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The quantity of machinery should be calculated according to the quantity considered in the construction organization design
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The amortization of machinery depreciation can be calculated according to the original purchase price of self owned machinery
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The cost of machinery leasing should be considered according to the regional market price
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01 the number of tower cranes and construction elevators can be found in the construction organization design, which is generally indicated by the plane layout
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In the case of no detailed indication, it can be drawn on the general plan, and the radius of tower crane model can be made into a circular field layout
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In general, the general layout is determined by the chief technical engineer or project manager, and the commercial or cost departments participate in the cost analysis
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The cost factor only considers the cost
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According to the cost analysis of construction site experience, the total construction period of high-rise residential buildings should be taken into account
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The number of two or three buildings sharing a tower crane will affect the construction period, and the cost should be balanced between the input cost and the construction period; The main consideration of multi-storey residential area is to determine the location of tower crane; Considering the operation radius of tower crane in industrial plants or public buildings, the best scheme is to select the location with the shortest manual horizontal transportation distance
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For example, there are 53 multi-storey western style houses in a project in Tianjin, with a total construction area of 73500 square meters, 5 sets of QTZ80 (zj5910) with arm length of 55 meters
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Among them, 43 ᦇ building and 79 ᦇ building are not within the range of tower crane arm distance, but this layout is the largest coverage
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Increasing the number of tower cranes needs to reduce the efficiency of mechanical operation
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Considering the multi-storey construction, the labor transportation cost is about 30000 yuan
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The construction elevator configuration of a project site general layout in Tianjin should be analyzed according to the building characteristics
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Each high-rise residential building has one elevator, and multi-storey residential buildings should consider whether they can share one construction elevator
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In some areas, the gantry frame is not limited to lift materials, and the selection of such machinery is also common in the use of multi-storey buildings, which is more economical and applicable
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The structure form should be considered within the third floor, and the construction elevator is not as good as the manual transportation, because the construction elevator is only used when the decoration is finished
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The manual transportation and the construction elevator are to solve the vertical problem within the eaves height of 10 meters, so the manual transportation is convenient and the cost is the lowest
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In some areas, tipping bucket trucks or truck cranes are used to lift the main materials to the floor
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In this way, only the labor cost can be increased
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02 the price composition of tower crane and construction elevator machinery construction tower crane enterprises are generally in the form of leasing, equipped with professional drivers, including the cost of tower crane drivers in the rent, but also have their own machinery and equipment
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When calculating the leasing form, it can be amortized according to the monthly rent, and the enterprise’s own form needs to increase the cost of operating drivers, transportation in and out of the site
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The depreciation time of self owned machinery and equipment can be determined according to the service life of machinery quota, and the cost price can be calculated by accounting the purchase cost of machinery and equipment, tower crane driver, maintenance and overhaul cost, and in and out transportation cost into the amortization
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Calculation of enterprise owned machinery and equipment: for example, an enterprise purchased five QTZ80 tower cranes in 2016, with a purchase price of 400000 yuan per crane
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The salary and insurance of the tower crane driver are equivalent to 8000 yuan per month, 16000 yuan per time when entering and leaving the site, and 600 yuan per month for maintenance and overhaul
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According to the national unified cost quota of construction machinery team, the depreciation life of tower crane is 14 years, the purchase price is 400000 yuan, the project use period of tower crane is 10 months, and the waste recycling depreciation cost is 150000 yuan
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The calculation is: (40-15) / 14 + 0.8 + 1.6 / 10 + 0.06 = 28000 yuan / month 28000 yuan / month * 5 sets = 140000 yuan / month: for example, a project uses five QTZ80 tower cranes and signs a contract with XX leasing Station
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The salary and insurance cost of the tower crane driver are included in the rental cost
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The monthly rental is 24000 yuan when entering and leaving the site, and the planned duration of the project is 10 months
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The calculation is: (2.4 + (10 + 1)) / 10 = 26400 yuan / month * 5 sets = 132000 yuan / month
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The estimated cost of construction elevators is similar to that of tower cranes
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The difference is that the salary and insurance cost of tower crane drivers are included in the management cost of construction units
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04 index data of tower crane and construction elevator machinery index data of construction tower crane and construction elevator vary in the database according to different project progress
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The construction schedule and building characteristics affect the data
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The extension of construction period will increase the use cost of machinery, and the large number of machinery shifts in the construction area amortization will also increase the cost price
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For example, there are 53 multi-storey western style houses in a project in Tianjin, with a total construction area of 73500 square meters, 5 sets of QTZ80 (zj5910) are used, the monthly rental is 24000 yuan, and the planned use period is 8 months
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The 26 construction elevators, model SCD200 / 200, are rented with a monthly rent of 9000 yuan, and the planned use period is 6 months
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The elevator is shared between two western style houses to save cost
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Calculate the cost price of the construction tower crane and construction elevator of the project
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Construction tower crane: (2.4 * (8 + 1)) * 5 = 1.08 million yuan construction elevator: (0.9 * (5 + 1) * 26) = 1.404 million yuan estimated cost price: (1.08 million yuan + 1.404 million yuan) / 73500 M2 = 33.8 yuan 05 summary and analysis through the above analysis, the cost of machinery and equipment purchased by the enterprise is higher than the rental cost, but as a general construction contractor, it should consider the building characteristics, For example, the leasing time of machinery and equipment in industrial projects is long, and the cost of enterprise self purchase method is much lower
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It is suggested that the real estate project should use the leasing method with low cost and price
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When calculating the cost price, the characteristics of enterprises and buildings should be considered
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Some enterprises have difficulty in capital turnover
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It is suggested that leasing can reduce the operation risk of enterprises
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According to the building characteristics, it is more in line with the market operation mode
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However, most construction enterprises with more than 10 years of operation still adopt mechanical leasing mode, because most enterprises are small-scale development, and the input cost of 14 years of depreciation is too large, which does not meet the operation conditions of enterprises.
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