In 1984, the State Council issued the Interim Provisions on Some Issues Concerning the Reform of the Management System of the Construction Industry and Capital Construction, which for the first time put forward the idea of establishing general contracting enterprises for projects.After more than 30 years, construction has become a pillar industry of national economic development, and China's economic development has entered the "new normal".Project general contracting has become an important support for the country to promote the transformation and upgrading of the traditional construction industry and the construction industry to a broader market.

The three major combinations of the future construction industry are BIM, assembly type and EPC

In 2016, the Ministry of Construction issued Several Opinions on Further Promoting the Development of General Contracting of Construction, which clearly proposed to "deepen the reform of the organization and implementation of construction projects and promote the general contracting system of construction projects". The general contracting of construction projects generally adopts the design - procurement - construction general contracting or design - construction general contracting mode.Opinions pointed out that construction units should give priority to the general contract mode of construction projects in accordance with the principle of reliable quality and efficiency when choosing the way to organize and implement construction projects.The general contract mode shall be actively adopted in government investment projects and prefabricated buildings.The emergence and popularity of BIM technology is undoubtedly the biggest technical change in today's construction industry. It subverts the original traditional work mode of design, construction and management, and also enables people from all walks of life to have a new understanding of the construction industry.In recent years, BIM technology in the design, construction and management of the construction industry has been widely used, BIM application in the engineering general contracting project management can effectively prevent in construction link, operation cycle and planning cycle, the connection of the information flow problems of the engineering information effectively, BIM value has been widely recognized.Another country vigorously promotes technology, assembly building "five integration", that is, design standardization, production factory, construction and assembly, decoration integration and information management of the goal, is facing the deepening of the management mode.The core of prefabricated building and engineering general contracting mode is integrated management. Based on the centralized research and development and production of prefabricated building under EPC mode, a new assembly structure system with "prefabricated assembly" as the core is established, which reduces waste, realizes industrial production and improves the efficiency of project management.At the same time, under the EPC project general contracting mode, the application of BIM technology can also effectively enhance the collaborative management ability of the EPC project team and realize intelligent construction.

The information application of BIM is an important support for building the general contracting of construction projects

BIM technology can effectively connect the majors of architecture, structure, electromechanical and decoration in series to form the integrated BIM design. The BIM information model integrates the collaboration and design changes of various majors, and provides a full set of information support for the later assembly construction and operation and maintenance management.The integration of design, production and assembly of prefabricated buildings requires the application of BIM information technology throughout the whole process.The digital information of each link will be constantly generated and integrated during the implementation of the project.In the EPC project general contract management mode, the concept of BIM technology collaboration and integration is highly integrated with the idea of the integrated construction of prefabricated buildings, especially the role and advantages of the information application of prefabricated buildings based on BIM are more prominent...

Information management of EPC project construction, and BIM sets the foundation for it.

The EPC project general contracting mode involves the information application of engineering project-related majors, related links and related businesses, which requires complete BIM model information and engineering construction-related business information as the basic data support.Based on BIM information management platform as a service to support the whole process of project operation, can form the enterprise resource database, and implement collaborative office, whole process of prefabricated construction design, production, assembly of purchasing, cost, schedule, contract, material, quality and safety of information management and finally realize the whole process of project resources effectively configuration.Application of BIM Technology in Project Management of General Contractors

1.  During the investment period, BIM software is used to model the projects that have not yet been constructed, and the three-dimensional display effect is conducive to understanding the specific situation of the building from various parties.

2.  Design stage In the integrated BIM design, architecture, structure, electromechanical and decoration majors build models in the platform design software according to the unified base point, axis network, coordinate system, unit, naming rules, depth and time nodes.In addition, each specialty can choose the components and parts that match each other from the building standardization, serialized component family library and part parts library to build the model, so as to improve the standardization and efficiency of modeling.In addition, various specialties need to coordinate their design processes. Through collaborative work, BIM model information is constantly enriched, and a comprehensive design model integrating design information of various specialties is finally formed.

3. Factory production stage

Factory production is a unique link in the construction of prefabricated buildings, and it is also the stage when components change from design information to entity.The BIM design information is directly imported into the central control system of the factory and transformed into production data information that can be read by machinery and equipment to realize the automatic production of prefabricated components and improve the operation efficiency and accuracy.

3. On-site assembly stage On-site assembly stage is the process of building entity from scratch to existence in the whole life cycle of prefabricated building.Under the EPC project general contracting mode, the BIM model is used as the carrier to share and integrate the on-site assembly information. Through the design information and the factory production information, the digitized, refined and visual management of project schedule, construction plan, quality, safety and other aspects is realized.Under the EPC general contracting mode, the design party and the construction party are a consortium, and the promotion and application of BIM will provide powerful information support for the improvement of economic benefits of EPC projects.China's construction industry whether policy orientation or internal demand, project general contracting is the trend of The Times.The essence of BIM technology is based on information technology, which drives the change of organizational form and construction process, and finally brings the change of construction process.The full application of BIM under the project general contract is the key to accelerate the transformation and upgrading of the construction industry.At present, the development of BIM technology has entered the 3.0 era. In addition to vertical development, BIM technology also needs to be extended horizontally. Only by fully combining with green building technology and PC technology, can it give full play to its role.

4. With the development of technology, all kinds of enterprises have started the exploration of BIM+.With the help of information technology such as BIM, the information barrier of all links, majors and participants is through, and the implementation and promotion of the integrated construction of prefabricated buildings is an important support for the practice of engineering general contracting mode and the deep integration of construction industrialization and information technology in China.With the continuous introduction and improvement of national BIM related policies, the application of BIM in the construction industry will be more and more extensive, and BIM technology will become more and more mature.The vigorous development of the project general contracting will also attract more and more construction practitioners to participate in the project general contracting.

5. For talents in the industry, countless front-line construction personnel are liberated from the two-dimensional abstract construction drawings, seeking skill changes from the construction site with low technical content, and exploring future career development direction.Improving professional skills is a survival skill that individuals have to practice under the general situation.