There are many mountain rivers in the southwestern part of China, and the mountains and valleys coexist. The martyrdom in the ancient poems is “difficult to go to the skyâ€. The saying “Guizhou has no three feet flat†is a true portrayal of the complex geographical features of the Southwest. The China Railway Second Hospital Engineering Group Co., Ltd. ("China Railway Second Hospital"), which is headquartered in Chengdu, has a more personal experience of the complex mountainous terrain in the Southwest. During the entire development period of 60 years, the engineering design technicians of China Railway Second Hospital waded through the mountains, from the Chengdu (Du) Kun (Ming) line to the South (Ning) Kun (Ming) line, from the Inner (Jiang) Kun (Ming) line. To the Bao (chicken) into (du) line, from the é‚ (Ning) æ¸ (Chongqing) line to the 襄 (阳) æ¸ (Chongqing) line, from the water (city) cypress (fruit) line to the æ¸ (Chongqing) Huai The line, the railway line between the mountains and the mountains in the southwest, has left the footprint of the exploration and design of the China Railway Second People. Nowadays, in the construction of a high-speed railway in the west, the engineering design technicians of China Railway Second Academy applied advanced 3D design BIM technology to turn their wisdom and inspiration into reality, once again writing a glorious one in the history of enterprise development. page.
Figure: Roadbed renderings
The bridge to tunnel ratio is as high as 81%, only the choice of three-dimensional design
Although it has been in the Southwest for many years, the engineers of China Railway Second Hospital are no strangers to the complex geology and geology of the Southwest, but when they face a high-speed railway engineering design project in the west, they still feel unprecedented pressure and serious challenge.
The length of the main line of a high-speed railway in the west is about 515km, and the design speed of the railway project is 250km/h. It is understood that a high-speed railway line in the west is mostly in the alpine valley, the geological conditions are relatively poor, the rock formation is broken, the tunnel group is more, the water system is more than the branch ditch, and there are more high bridges to be built. There are 14 special bridges and 180 of the 193 tunnels are extra-long tunnels. According to the EIA approved by the environmental protection department, the proportion of bridges and tunnels in the whole line has reached a staggering 81%.
For the mountains and mountains in the southwest mountainous area, the terrain and geological conditions are very complicated, and the design and construction are very difficult. The engineering designers of China Railway Second Hospital have long been commonplace. However, the problems they face this time are far more than that.
The overall line of a high-speed railway project in the west is long, and there are many influencing factors in the plane selection and cross-section design of the subgrade. The workload is large, and the project design cycle is relatively short. Dong Fengxiang said, “The project owner gave us a circuit design time of only about 6 months. Compared with the same scale project, the design time has been cut by half. Therefore, one of the major challenges of the project is to have a limited project design cycle. , to complete the comparison of multiple programs, and generate high-quality cross-section design drawings, and the owners expect to obtain the final effect of the design in a more intuitive way."
How to deal with the challenge, in order to deliver a satisfactory answer to the owner in a limited time? China Railway Eryuan has turned its attention to the new 3D design technology BIM.
In fact, in 2010, in order to further promote the three-dimensional design work of China Railway Second Hospital and continuously improve the company's level of scientific and technological innovation, China Railway Second Hospital established the overall group consisting of the three-dimensional design leading group of the general manager of the company and the backbone of the railway design professionals. It has carried out pilot projects of several railway projects relying on well-known software at home and abroad, and achieved good results. Zhou Jian, head of the 3D design team of China Railway Eryuan, said that as a traditional survey and design enterprise, only through technology and management innovation can bring greater value to the company. He believes that BIM, as the core concept of leading 3D design, believes that it can play a huge role in railway survey and design. “The biggest problem with promoting BIM applications within the enterprise is that 3D design is not a simple upgrade, but a leap-forward change compared to traditional 2D design. In this process, it is necessary to research and build a new set of And in line with the three-dimensional design of the working mode and design process, thus ensuring a smooth transition and implementation from 2D drawing to 3D design." Zhou Jian said.
Intelligent and efficient design, BIM is indispensable
A high-speed railway project in the west is complex in terrain, involving many professions, and the project process is complicated. In addition to involving a wide range of topographic data, long-distance line layout, subgrade design, bridge and culvert and tunnel design design occupy preliminary design. The main workload. Yang Lan, a professional engineer of the China Railway Second Hospital Bridge, said that there are three main challenges in the project: First, the time pressure is high. Because the project is divided into two-dimensional design and three-dimensional design, the human resources are relatively tight. Second, the project involves more professionals. There are many types of design software used, and at the same time, it is necessary to strengthen professional collaboration. Third, the existing professional team lacks 3D design experience, and needs to invest a certain learning cost and time cost in the early stage. To this end, China Railway Eryuan has established a special 3D project team to carry out pre-training of 3D design, and invited Autodesk technical experts to provide technical support to effectively ensure the progress of the project. In addition, the company's related software developers also carried out custom development of software for some feature requirements, to meet the characteristics of railway survey and design requirements.
In a high-speed railway project in the west, the performance of the 3D design BIM technology in the line and subgrade design of the CK106-CK172 section left a deep impression on Yang Lan. The CK106-CK172 section is one of the most complex sites in the terrain, including the middle and high mountains, the erosion of the middle and low mountains, the erosion and the dissolution of the landforms. The AutoCAD Civil 3D software used by China Railways Second Academy provides a parametric route layout tool (supporting straight lines, circular curves and various mitigation curves) based on the 3D terrain model, supporting the design of planar lines and verticals in a dynamic interactive manner. Curve elevation and cross-section subgrade form, finally form a three-dimensional railway subgrade model, and ensure that all three-dimensional engineering objects are intelligent associations, one modification, and updated everywhere. Once the 3D model is complete, the system can automatically create sheet sets in batches and generate earthwork construction drawings and calculation reports. At the same time, each individual cross-section can be browsed and modified one by one, and the design results can be published directly to Google Earth for direct viewing and real WYSIWYG. It solves the problem of data synchronization between line professional and subgrade professional, greatly improving design efficiency.
In fact, AutoCAD Civil 3D's intelligence and efficiency are indispensable throughout the project design. It allows designers to focus on the design itself. In the 160-kilometer railway subgrade design, the designer spent about 10 days to study the details of the slope, retaining wall and drainage ditch, and only used a small amount of time to revise the drawings.
In addition, in the design of the station, the designers adopted the Autodesk Revit series software based on BIM concept, using Autodesk Revit's working set and link management to integrate and conflict detection of multi-professional Autodesk Revit models, avoiding a small one. The construction cost that may be caused by the collision between the professional is greatly increased. Not only that, through the Autodesk Revit series of software, the owner can more intuitively and vividly understand the final form of the design results, greatly reduce the communication barriers in the process of reporting and communication, and is highly recognized by the owners.
It is understood that a high-speed railway project in the west is still in the adjustment period. In the later period, the China Railway Second Academy will deepen the design of the local worksite according to the owner's requirements, including the direction of the line, the adjustment of the special bridge plan, the detailed design of the station building, and so on.
BIM brings industry revolution
Through the use of three-dimensional design means, China Railway Eryuan has realized the synergy and sharing of data between major design majors such as lines, subgrades and bridges for the first time in a high-speed railway project in the west, which not only improves the quality of engineering design, but also provides more for the owners. Intuitive delivery method. Dong Fengxiang said, “A high-speed railway project in the west is the most complicated project we applied for BIM design.†He admits that the application of BIM for project design in China Railway Second Hospital has experienced three stages of learning period, chaos period and growth period. The technical application of BIM is still in the trial stage. How to speed up the application of BIM in the company, the related work is still in the exploration and research stage.
Then, after a series of practices, what are the new understandings of BIM by the engineering design technicians of China Railway Second Academy?
Dong Fengxiang said that BIM is an advanced design concept. The world's major software manufacturers have different tools for implementing this concept. Currently, the market is more common or more familiar to the public and is accepted by Autodesk. A set of complementary tools for the entire BIM implementation that form a complete BIM solution. It is based on the Autodesk Revit three-piece set, with tools such as Autodesk Navisworks and Autodesk 3ds Max Design and Autodesk Ecotect, as well as AutoCAD series products as an aid. He stressed that all software should complement each other, all tools must cooperate and rely on each other to achieve BIM together, and the realization of BIM must be the result of teamwork, not a product of single-handedness. Therefore, in terms of the integration degree of the entire platform, Autodesk has greater advantages and popularity in this respect than other manufacturers' products.
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