comparison of economic indicators

comparison of economic indicators between the two construction methods 2.1 comparison of basic quantities the total construction area of the pilot project is 3870 square meters. See the following table for the main structure sbs steel buildings quantities of the two construction methods. The quantities in the table are consumption per square meter: from the table, we can see that: Using prefabricated steel structure can greatly reduce the workload of wet operation on site. The concrete-filled steel tubular column not only saves the concrete consumption and reduces the concrete consumption by 5%, but also saves the steel compared with the pure steel column, and avoids the formwork and scaffold of the column. The use of PK prestressed composite slab can save 4% of the steel consumption and 32.2% of the concrete consumption compared with the cast-in-place structure, and at the same time, the formwork and support can be avoided. Using prefabricated steel structure, its concrete consumption is 65 times of the traditional cast-in-place concrete frame structure, get more and its total steel consumption is 1.5 times of the traditional cast-in-place concrete frame structure. 2.2 comparison of the engineering cost of the upper main structure of the two construction methods 2.2.1 cost composition here, we mainly compare the direct costs of the two different connection methods. By querying the related consumption quota of construction engineering and engineering cost information, the cost of the two different ways are as follows: 1. The cost of the upper main structure of prefabricated steel frame is as follows: note: the total cost of human, material and machine in the table is the total cost of direct cost from the analysis of the above table, it can be seen that: prefabricated steel frame is adoptedThe main components of the fabricated steel frame structure, such as beams, columns, floors and wallboards, account for 26.87%, 18.171%, 15.726% and 30.777% of the total cost respectively, and the corrosion prevention and fire prevention account for 4.418% of the total cost. 2. The cost of the main structure on the cast-in-place concrete frame is shown in the sbs steel buildings following table: note: the total price in the table is the sum of the cost of people, materials, machinery and the measure cost of the professional construction project in the direct cost. according to the analysis of the above table, when the traditional cast-in-place concrete frame construction mode is adopted, the main components such as beams, columns, floors and wallboards account for 20.22%, 16.22%, 25.30% and 30.5% of the total cost respectively. the traditional cast-in-place concrete frame system through the cost composition of the above two different construction methods, we can see that the cost of the prefabricated steel structure is significantly higher than that of the traditional cast-in-place concrete frame structure, 360 yuan per square meter more expensive than the traditional cast-in-place method. The cost of PK composite floor used in fabricated steel structure is 92 yuan / m2, accounting for 15.7% of the total cost; the cost of cast-in-place floor used in cast-in-place concrete frame is 157.97 yuan / m2, accounting for 25.3% of the total cost; compared with the cost of PK prestressed floor, although the cost of PK prestressed floor is higher, the cost of PK board production and installation is 87.56 yuan / m2, it can save the cost of formwork support, The cost of cast-in-place formwork is 59.71 yuan / m2, which can save part of the amount of reinforcement and concreteIt is similar to cast-in-place slab. Therefore, compared with the cast-in-place floor slab, PK prestressed composite slab has better economy. The wall cost of fabricated steel structure is 303.18 yuan / m2, accounting for 30.78% of the total cost; the traditional masonry wall cost of cast-in-place concrete frame is 190.59 yuan / m2, accounting for 30.5% of the total cost. The proportion of wall in the total cost of both is relatively large. The traditional block wall has a lot of wet work and heavy workload, and the construction procedure of lintel and structural column is complicated. There are a lot of formworks and scaffolds, resulting in the higher cost of its wall compared with other components. The prefabricated wall is mainly due to its high cost of production. The cost of fire prevention and corrosion prevention of fabricated steel structure is high, which is 43.52 yuan / m2, so it should be paid enough attention. 2.2.2 economic analysis of project cost The wall occupies the largest proportion in two different construction methods, the prefabricated structure is 30.79%, and the cast-in-place concrete frame is 30.53%, which is basically the same; the high cost of the wall is mainly due to its large consumption. On the other hand, in the concrete frame structure, the wet work volume of masonry wall is large, and there are formwork and scaffold erection, the construction is tedious, which leads to high cost; in the prefabricated structure, the high cost of wall is mainly due to the high price of materials. Floor is in prefabricationThe cost of steel structure is 15.73%, and the cost of concrete frame structure is 25.3%. It can be seen that the comprehensive economic benefit of PK precast slab is higher than that of cast-in-place concrete slab. comparison of cost indexes of people, materials and machines in two different construction methods: note: the total working day is a basis for statistics of labor cost in engineering measurement, such as building a house with five workers, and thus, if it takes seven days to build a week, then the total working day is 35 (5 people * 7 days), and the working day is 5 (1 day * 5 people). According to the analysis of the above table: 1. The labor cost of prefabricated steel structure system is 38% less than that of traditional cast-in-place concrete structure system. Therefore, the use of fabricated steel structure system can save labor costs, in the face of rising labor costs, this advantage will become more significant. 2. The material cost of prefabricated steel structure system is 85% higher than that of traditional cast-in-place concrete structure, mainly because the price of prefabricated components of wallboard is higher, and the amount of steel used is large. 3. The mechanical cost of prefabricated steel structure system is 26 times of that of traditional cast-in-place concrete structure. It is mainly due to the heavy lifting and installation work of prefabricated components. 4. The total working day of prefabricated steel structure system is 38% less than that of traditional cast-in-place system, which saves labor cost and shortens construction period. The shortening of construction period can save loan interest, lease fee and site management fee of large machinery on site. Cui Lu. Prefabrication and assemblyResearch on the economy of steel structure building [D]. Shandong University of architecture, 2015. Hao Jiping, sun Xiaoling, Xue Qiang, etc. Research and application of green fabricated steel structure building system [J]. Engineering mechanics, 2017, 34 (1): 1-13. this paper comes from the first construction network, only for sharing learning and exchange. If there is infringement, please contact the editor to delete it!