BIM and Prefabricated Construction | [BIM Level Case] Xiangjiang Wealth Financial Center Project

At the beginning of 2018, Hunan Construction Engineering Group proposed the BIM technology application index: 100% BIM technology application rate for target responsibility system projects, PPP projects, and new projects with a value of over 20 million. At the end of 2018, Hunan Construction Engineering Group organized a BIM work assessment, and a number of projects with high BIM application levels emerged. The project application areas have expanded from housing construction to municipal, transportation, steel structure, industrial equipment installation, water conservancy and hydropower, and other construction fields.

Xiangjiang Wealth Financial Center Project

Xiangjiang Wealth Financial Center is a “financial landmark of Xiangjiang New Area” built by Changsha Xianfeng Investment Holding Group Co., Ltd. with a total investment of 6.3 billion yuan, developed and constructed by Changsha Xianfeng Hengwei Real Estate Development Co., Ltd. The project is located on the central axis of Hunan Financial Center, integrating 300000 square meters of financial office buildings, 120000 square meters of international intelligent shopping centers, 42000 square meters of super five-star hotels, and 22000 square meters of serviced apartments, with a total area of 630000 square meters. Among them, the 328 meter international 5A office building is the tallest building under construction in Hunan Xiangjiang New Area. The project is located at the intersection of Xiaoxiang North Road and Chazishan Road in Binjiang New District, Changsha City, with a total area of 59355 square meters and a total construction area of 632694 square meters. The project is divided into two phases, with the western area including the basement of T3 and T4 super high-rise buildings and their affiliated podiums, and the eastern area including the basement of T1 and T2 super high-rise buildings and their affiliated podiums. The total cost of air conditioning for the project is 200 million yuan, and the project uses the municipal Jiangshui Energy Station as the cooling and heating source. The air conditioning system includes various systems such as fan coil units with independent fresh air systems and VRV systems.

Establishment of BIM Workstation

Establish a project level BIM application management system:

project platform

Project adopted: project level server+CAD for quick image viewing

Internally, the project uses the project server as the carrier to deliver models and deliverables. A cloud platform for quick CAD drawing of labor services is used to issue detailed drawings, centrally manage them, and avoid problems such as on-site errors and excessive work caused by drawing version issues.

staffing

According to the company’s standard project attributes, three BIM engineers will be selected for this project.

Liu Hong: Responsible for the implementation and application of BIM in project projects; Responsible for coordinating technology and BIM work with the construction party; BIM deepening and drawing work for the air conditioning room of the project.

Li Yang: BIM deepening and drawing work for the tower section; Technical disclosure of BIM drawings for the tower section; Daily maintenance of the model.

Jiang Yuwei: BIM deepening and drawing work for the basement of the podium building; Technical disclosure of BIM drawings for the basement of the podium building; Daily maintenance of the model.

Difficulty analysis

Construction difficulties: The project has a large engineering volume, complex systems, cross disciplinary construction, and tight schedule.

Model splitting

Due to the large scale of the project, with a total construction area of 600000 square meters and an overall model size of over 1.5G, commonly used BIM configurations are difficult to meet the requirements. Therefore, the project has divided the model into three major parts based on their functional and structural characteristics:

1. Tower section (T1, T2, T3, T4);

2. Podium section (Phase I podium, Phase II podium)

3. Basement section (Phase I basement, Phase II basement)

Overall model of Phase I podium building

Phase II basement model

BIM application points

01 Drawing review

By utilizing the visual characteristics of BIM models, problems on the drawings of various functional areas can be identified in advance through the use of models. The professional requirements of each construction party can be collected, and internal review can be conducted in the BIM studio before reporting to the technical leaders of each unit. Two checks are conducted to strictly adhere to quality, achieve early detection, efficient communication, and early resolution.

Problem Submission Record Form

02 Pipeline Integration

The deepening of the air conditioning room in this project is a difficult point: the space is small, there are many devices, the diameter of the air ducts in the room is large, and there are too many intersections with other professions in the refuge layer. While considering the rationality of the profession, more engineers need to consider the construction process.

During the deepening process, it was found that the width of the T1 standard floor computer room was only 3600mm, while the equipment width reached 2500mm. There was insufficient space for equipment takeover and maintenance door opening. After communicating with the equipment manufacturer, it was changed to an internal maintenance door, reducing the space required for external opening of the maintenance door and meeting the on-site construction requirements.

In the equipment area of the refuge layer, while the pipeline meets the construction requirements, the accessibility of the later maintenance channel is also considered to ensure space for personnel and equipment to replace parts.

03 Net height inspection

For public areas such as basements, corridors, and halls, Fuzor will be used for net height inspection during the model deepening phase. The net height of pipelines during the construction phase will be strictly controlled to ensure that their installation meets the decoration design requirements, and a net height report will be generated and submitted to the construction party.

Net height detection

Net height detection report

04 Comprehensive bracket

Before the production of pipeline supports and hangers, the elevation, position, and form of prefabricated building pipe supports should be determined. At the same time, if conditions permit, shared supports should be used with other specialties as much as possible, and detailed support drawings, partial support section diagrams, and positioning diagrams should be provided.

05 Reserved Hole

This project has multiple functions, complex installation design, and involves multiple specialties. It is necessary to accurately determine the reserved and embedded parts in advance to determine the pipeline direction, trench excavation position, etc., effectively avoiding the phenomenon of secondary rework and idle work in the later stage.

06 BIM drawing

In the application of BIM project level, we will transform the deepening results into CAD files based on the demand and theoretical level of labor and workers, including comprehensive drawings (including various professional pipelines), professional drawings (such as air conditioning water, air conditioning air, comprehensive support and hanger, etc.)

Comprehensive diagram: Clearly identify what is present at each location and which pipelines need to be avoided.

Professional diagram: Clarify the installation location of single professional pipelines.

07 Progress Management

Regarding the project schedule, Navisworks is used to pre simulate the overall implementation of the project, identify problems in advance, and ensure that the project proceeds as scheduled.

progress simulation

schedule

The application value of BIM

1. By establishing a complete electromechanical model and deeply optimizing the pipeline, the layout of the electromechanical pipeline is reasonable and beautiful. The comprehensive assembly construction support and hanger form is adopted, which saves the amount of steel used for the support.

2. By establishing project level servers and centralizing the work of various professional engineers, timely communication and resolution of problems can be achieved to avoid unnecessary rework in the later stage.

3. Relying on BIM technology, each unit has a better carrier for cost, technology, and management, which facilitates information transmission and delivery among units.

Project Rating

opinion:

1. The application points of BIM mainly focus on drawing review, mechanical and electrical deepening, and progress simulation, and the application field is relatively narrow. It is recommended that the project department can carry out applications in construction site layout, process simulation, cost calculation, BIM information platform management, etc., and integrate BIM into the entire project construction process.

2. The application of pipeline comprehensive projects should be equipped with a pipeline comprehensive report, which should include the optimization parts, optimization principles, handling opinions from all parties, and comparison of optimization before and after.

3. It is recommended to supplement the corresponding reserved hole diagram for the application of reserved holes.

4. This project has a large engineering volume, complex system, and tight schedule. The requirements for construction organization design and various schemes are high. It is recommended to apply BIM in aspects such as 3D site layout and schedule arrangement and integrate them into relevant construction organization and scheme design to assist in construction disclosure.

5. It is recommended to implement BIM platform management applications for the project, linking construction information based on the same BIM model, sharing and pushing information in real-time to the corresponding responsible persons, and assisting project management and decision-making.

Summary rating:

This project has implemented multiple single point BIM technology applications, focusing on reducing the need for demolition, modification, and rework during the construction process, and lowering project costs. However, overall, the application areas are relatively narrow and not comprehensive enough, and relevant platform applications have not been used. The value of BIM has not been deeply explored, and the degree of information transmission and interaction is low. Therefore, based on comprehensive evaluation, the BIM rating of this project is BIM Level 2-.

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