Application of BIM technology in solving intersections of urban technical infrastructure

Authors:  Trương Thụy Minh Hoàng; Nguyễn Văn Hùng; Nguyễn Mạnh Quân; Nguyễn Văn Việt; Vũ Văn Khu

Hoa Phong E&C Investment and Development Joint Stock Company  

Reviewer: Assoc.Prof.Dr. Tong Tran Tung

ABSTRACT: The design of technical urban infrastructure is categorized into different systems such as drainage system, technical dyke system, electrical and communication system etc. However, the interference among infrastructure systems is always one the the greatest challenging issue This article aims to introduce the application of BIM (REVIT software particularly) during design and construction stages to thoroughly resolve the interference by applying the visual 3D models in technical urban infrastructure.

Keywords: BIM (building information modeling), handling crossings, revit, designing technical infrastructure of urban.

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1. BACKGROUND
Currently, the use of Autocad 2D to represent urban technical infrastructure design drawings is very common and widely applied in Vietnam. The traditional process applied to the design and handling of intersections in urban technical infrastructure is shown as  Figure 1.1  below:

Figure 1.1: Typical workflow diagram

In this process, the 2D Cad system still has some limitations: First of all, design changes are inevitable throughout each project. Engineers will have to repeat the process many times, wasting time and effort, leading to sometimes unsatisfactory quality. Next, when there is data information that needs to be edited, the communication between the former and the latter may cause confusion, resulting in difficulty in coordinating the design and implementation. construction on site. Due to the independent design of each type of technical infrastructure, when synthesizing, adjusting and repairing the design, many problems can arise that are difficult to control. This requires an experienced project manager who has the ability to grasp the whole project. With normal 2D images, it is sometimes difficult for customers to feel and visualize the actual product, which leads to difficulties in deciding to trust the product. In any project, contractors and investors have a large amount of 2D drawings in their hands. Effective management of the current building and future maintenance is always a big challenge for all stakeholders throughout the entire project life cycle. To solve the above problems, BIM technology (specifically Revit software) has been applied through building realistic 3D models to check and thoroughly handle the types of intersections in the structure. urban infrastructure.
2. INTRODUCTION TO INFORMATION MODELING IN CURRENCY TECHNICAL INFRASTRUCTURE CONSTRUCTION AND APPLICATION SOFTWARE
2.1. BIM model The concept of BIM has existed since the 1970s [1]. However, the term BIM did not come into common use until 10 years later, when  Autodesk  released a book titled “Building Information Modeling” [2]. Jerry Laiserin (industry analyst) helped popularize the term and set the standard for the term  expression for “model representation” in three-dimensional space [3]. Building Information Modeling (BIM) is an intelligent model-driven process that makes design, project engineering, and operational information accurate, accessible, and usable for construction companies. program [4]. BIM shows a digital model but most realistically describes the work when completed in the future, so architects, M&E engineers, contractors and investors at different stages in the life cycle of the work can add information to it, export information from it, or edit information in it to support their work. BIM creates opportunities for project members to exchange ideas, discover new ideas as well as make appropriate decisions before construction to reduce risks, delay progress, reduce costs. construction cost and importantly, product quality is always at the best level [5]. 2.2. Revit software Revit is a very powerful software developed by Autodesk, produced in the direction of BIM. Revit software is based on parametric modeling technology [6]. A product is a work built using 3D digitized models consisting of virtual components containing parameters such as geometry, materials, calculations, cost and many other parameters. Revit can show from the general to the detailed floor drawings, 3D shapes, easy to export 2D sections accurately. Revit is a convenient, time-saving tool when each project member can implement each stage separately, allowing to edit or change the design at any stage of the project to create a perfect product.
3. PROCESS OF IMPLEMENTATION OF TREATMENT OF INTERSECTIONS OF URBAN TECHNOLOGY INFRASTRUCTURE

To meet the requirements of detecting and handling intersections between types of technical infrastructure thoroughly, BIM technology has been applied to model management, specifically the use of Revit software. through the workflow below:

Figure 3.1: The process of performing clash processing

3.1. Input data

For the road surface model, the information in the cross-section at the piles, the longitudinal profile and the route plan is used. For technical infrastructure for wastewater drainage, rainwater drainage, technical infrastructure for water supply and technical trenches, technical infrastructure for electricity supply, and technical infrastructure for telecommunications, use information on the profile along the route. , route positioning plan and details of manholes and pipelines for detailed modeling of manholes, and at the same time need technical standards of infrastructures that will indicate conditions considered to have intersections.

3.2. Intersection handling process

The handling principle is agreed between the parties on the priority of the infrastructure. Here, the principle is applied: Road ® water supply - drainage ® electricity ® telecommunications. When an intersection occurs, according to the agreed priority, the low-priority infrastructure will be changed to avoid intersecting with the higher-priority infrastructure. The detailed model is shown in the diagram Figure 3.2.

Figure 3.2: The process of performing clash processing

The model consists of three main parts: the 2D data part used to build the test model, the model building part, detection, intersection processing and the finished output 3D data part with the intersection processed. In which, the intersection test rendering includes the road surface model and four inspection rounds of the infrastructure. For each erected infrastructure route, tests with the previous infrastructure will be conducted. When a test cycle of a route ends, all intersections of that route have been thoroughly processed, so there will be no missed intersections.

Thus, looking at the process diagram, we will see that we will check each round in turn, at the end of each round, that infrastructure has been repaired and will move to the next infrastructure without the phenomenon occurring. overlapping. At the same time, due to the repair on the 3D model, it is possible to see the visual intersection image and immediately see the impact after repair with the surrounding infrastructure.

In special cases where there is an intersection and the electricity and telecommunications infrastructure cannot adjust and handle the intersection, it will return to adjust the part of the water supply - drainage infrastructure.

3.3. Output data

To handle the intersection, the output information must be correct, sufficient, fast and intuitive. Infrastructure modeling by Revit ensures all criteria through exporting drawings with 3D images, exporting cross-sections, vertical profiles at any position with simple and quick operation.

4. RESULT

- According to the traditional method, the intersection inspection will be repeated, but according to the above process, modeling by Revit software will overcome the overlapping checks and have an end point.

- Automatically update data when we change a model in any drawing  (Figure 4.1 and Figure 4.2).

Figure 4.1: 3D model after processing clash

Hình 4.2: Cross-section before/after processing

- In terms of coordination between design and construction, it is possible to combine design and construction techniques at the same time. The example below shows that the electrical infrastructure is designed according to the original principle, but there is an intersection with the drainage pipe. The adjustment to change the path of the infrastructure according to the standard to avoid intersections is carried out and created on the model to describe the most realistic state of the work during construction  (Figure 4.3).

Figure 4.3: Adjusting the path of the infrastructure when an intersection occurs

- Modeling information and displaying it on a 3D model, so capturing information about that model is almost universal to everyone, so it is not necessary to hire an expert or a project director with too much experiences.

Figure 4.4:  Infrastructure information in 3D Model

- From the 3D model we can clearly see the position as well as the visual intersections. For example, when observing on a 2D plan, it is not possible to see the technical trench area intersecting with the road surface  (Figure 4.5). However, when observing on the 3D model, it will immediately see the extent of intersection of the technical trench with the line shown in different colors  (Figure 4.6).

Figure 4.5: Mặt bằng kiểm tra không thể hiện giao cắt

Figure 4.6: Nhìn mô hình 3D trực quan

- When the project is put into use, problems or problems that need to be maintained can be observed on the model, thereby finding out the exact location, as well as the height to does not affect other infrastructure by exporting the cross section at any position  (Figure 4.7).

Figure 4.7: Mặt bằng

Figure 4.8: Cross section

5. CONCLUSION

From the above study, it is shown that the traditional manual design of intersections of urban technical infrastructure, deployed individually, leading to uncontrollable conflicts will be overcome by applying Using BIM to get a common database, the model contains full information of these types of infrastructure intersections to handle them easily and in a timely manner.

Not only that, BIM is increasingly being applied to large projects. The widespread and widespread application of BIM will bring about revolutionary changes in the creation, representation and use of building information throughout the design, construction and operation processes. The ability to consolidate information from all stages of BIM is increasingly becoming an inevitable trend of the Construction industry to optimize the design, construction and management of works.

References

[1]. Eastman, Charles; Fisher, David; Lafue, Gilles; Lividini, Joseph; Stoker, Douglas; Yessios, Christos (1974), An Outline of the Building Descripiton System, Institute of Physical Planning,Carnegie-Mellon University.

[2]. Van Nederveen, G.A.; Tolman, F.P. (1992), Modelling multiple views on buildings, Automation in Construction 1.

[3]. Autodesk (2003), Building Information Modeling, San Rafael, CA, Autodesk.Inc.

[4]. Thanh Huyen (2016), Understanding BIM to improve construction quality, trìnhElectronic newspaper of the Ministry of Construction. [5]. Nguyen Thi Nha Trang,  Research materials for lecturers of Faculty of Economics and Construction Management,  Construction University. [6]. Nguyen Van Thiep (2014), Revit Architecture - 3D Architecture Design Software R2014-2015.