With the rapid development of our society, information data has shown a rapid growth trend. In addition, todays construction projects are becoming more and more complex, which requires higher level of traditional cost management. However, the cost personnel in many cities still adopt the calculation rule of bill quota quantities, which results in that the traditional cost management mode does not match the needs of todays society. This also limits the development of the cost management level of construction projects, and has an impact on the development of the construction industry. Therefore, we will use BIM technology to combine the project cost with the large database in BIM model, and change the traditional cost management mode.
- BIM Technology
“Building Information Modeling”, which is a technology being called as a “revolutionary” technology, is a concept proposed by Doctor Chunk Eastman from Architecture and Computer School of Georgia Tech Collage: building description system diagram. In 1986, Robert Aish put forward several characteristics about the present BIM. In 1999, Chuck Eastman developed “building description system” into “building information modeling”, which contains all information, functional requirements and performances of different majors. All information of a project, including all information of the design process, construction process, operation and management process are integrated into one building modeling. In 2002, Jerry Laiserin published COMPARING POMMES AND NARANJAS, enabling the word-BIM to be widely used in the engineering construction industry.
In recent years, BIM technology has gradually developed into a kind of multidimensional (threedimension space, four-dimension time, five-dimension cost, N-dimension more application) model integrated technology, so that all participants of the construction project (include the government competent department, proprietor, designer, constructor, supervisor, cost engineer, operation manager, project user and so on) can operate model in the modeling operation information and information in the entire life cycle from concept generation to complete demolition, thus fundamentally changing the work mode that the employees rely on the drawing in symbolic form to conduct project construction and operation management, achieving the goal of improving efficiency and quality and reducing errors and risks throughout the life cycle of a construction project.
- Big Data
Big data is a collection of data beyond the collection, storage, control and analysis capabilities of traditional software. Therefore, its main significance is not to collect a large amount of data, but to adopt a new model to deal with these data professionally and draw some useful conclusions for itself. Construction project based on big data is not simply combining construction project with a lot of data. It is an information collection system, through which managers can analyze the huge data of the construction project and clearly understand the relevant data and potential problems of the project.
- Engineering Cost Management
Engineering cost management means to solve the practical problems of cost prediction, control, supervision and analysis in engineering construction through utilizing the technology, economy and law administration approaches comprehensively from different levels in the overall process of engineering construction. Its goal is to obtain the greatest investment benefit with the least manpower, material resource and financial resource. The basic content of engineering cost management is to appropriately determine and effectively control the engineering cost.
At different stages of engineering construction, the entire process of engineering project construction cost management has different work contents. The purpose is control actual cost of construction project. The process of engineering cost management in China is constituted by four stages, which are respectively:
(1) Engineering Scheming Stage. The main work of this stage is to conduct technological demonstration to the necessity and feasibility of the proposed project, which is mainly reflected in the compilation and approval of the investment estimation, techno-economic comparison of different construction schemes, as well as the judgment and decision making. Its goal is to carry out financial evaluation and put forward project scheduling decision. In the past engineering practice, the cost management work of this stage was not concerned. However, with the standard development of the engineering construction, the cost management of the scheming stage has attracted the attention of the construction party, which will certainly bring greater improvement to the refinement of the investment estimation work at this stage.
（2）Engineering Designing Stage. The main work of the engineering designing stage is divided into: comparison of design schemes and schemes, compilation of design estimate, compilation of working drawing estimate, in which, the design scheme also includes: preliminary design, technology design, construction drawing design preparation, construction drawing design. Their effects on engineering cost are as follows: 20%, 40%, 40% and 20%, respectively. The comparison and selection of the design schemes are usually completed by adopting the value engineering method. Design estimate is an important constituent part of the preliminary design, which is not only the basis of controlling the construction drawing and construction estimate, but also the basis of signing the construction contract and loan contract. Working drawing estimate is the basis of controlling the construction cost and rational using of the fund, the basis of determining the project bidding control price and pre-tender estimate, the basis of allocating the engineering fund and transacting the settlement.
（3）Engineeri
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