1. Project Overview
The opening of the Beijing-Xiongxiong Intercity Railway will further improve the railway network layout in the Beijing-Tianjin-Hebei region and help improve the coverage of railway transportation. As the railway transportation hub of Xiong'an New Area, Xiong'an Station will closely connect Beijing, Tianjin and surrounding cities, strengthening the connection between Xiong'an New Area and these central cities. As a key area for China's future development, Xiong'an New Area's radiation capacity is crucial. The opening of the Beijing-Xiong'an Intercity Railway will enable more people to easily visit the Xiong'an New Area, attract more talent flows, and promote economic development. The construction of Xiong'an New Area is a major strategic initiative of the Chinese government, and this railway project will provide strong transportation support for the development of Xiong'an New Area and promote the coordinated development of the Beijing-Tianjin-Hebei region.
The new Beijing-Xiong'an New Area Intercity Railway is located in Beijing and Hebei Province, with a total length of 92.783km from Beijing hub Liying Line in the north to Xiong'an Station in the south. The line involves Daxing District of Beijing, Gu'an County, Yongqing County, Bazhou City and Xiong'an New Area of Langfang City, Hebei Province. There are five stations on the whole line: Daxing Station, New Airport Station, Gu'an East Station, Bazhou North Station and Xiong'an Station. Among them, about 35.883km of the section from Liying to the new airport will maintain the original construction plan of the Jingba intercity project, and the main line length of the new airport to the new section of Xiong'an will be about 64.4km, as well as the new Beijing-Tianjin liaison line, Xiong'an East hub liaison line and other related projects.
Relying on the application of BIM technology, the Beijing-Xiongxiong Intercity Railway has achieved a series of intelligent achievements in the construction stage, including intelligent prefabricated building design and intelligent construction. It makes the construction process more efficient and accurate, reduces waste and improves construction quality. The application of BIM technology has made the Beijing-Xiongxiong Intercity Railway an innovative model in the field of modern railway construction in China.
2. BIM technology application
Combined with the BIM application objectives, actual construction period requirements, construction difficulties and characteristics of the project of Beijing-Shenyang Railway Passenger Dedicated Line Beijing-Hebei Co., Ltd., China Railway Construction Electrification Bureau Group Co., Ltd. and the project department, the BIM application content of this project was formulated.
The model applications include: 3D electronic sand table, 3D triage, visual disclosure (process method simulation), deepening design (model collision check (catenary insulation gap in the tunnel, comprehensive cable synthesis); inspection of hole reservation; cable laying optimization; generation of part of the detailed design drawing).
The functional modules of the construction-level BIM management platform include: 3D electronic sand table, 3D triage module, catenary wrist arm hanging chord pre-configuration data management, material management, construction progress visualization management, safety/quality management, management cockpit, information management based on BIM such as one pole and one file, cable/optical cable path query management, construction document management, railway engineering management platform interface module, professional interface identification management, platform WeChat access module.
According to the BIM implementation and application objectives, the project department has compiled the BIM construction application plan, research report, and demand analysis report (including project-level BIM application implementation standards), and participated in the preparation of three enterprise standards of Beijing-Shenyang Railway Passenger Dedicated Line Beijing-Hebei Co., Ltd. Finally, a project-level BIM standard system was established to lay the foundation for enterprise-level BIM standards.
In particular, the project-level BIM standard system is based on the railway BIM alliance and relevant national and industry standards, combined with the characteristics of the construction application of the four electrics, and has been expanded and improved accordingly. The main criteria are as follows:
GB/T 51212-2016 Unified Standard for the Application of Building Information Modeling;
CRBIM1003-2017 "Railway Engineering Information Model Expression Standard (Version 1.0)";
CRBIM "Data Storage Standard for Information Model of Railway Four-Electric Engineering (Version 1.0)";
GB/T 51269-2017 "Standard for Classification and Coding of Building Information Modeling";
CRBIM "Railway Engineering Information Model Classification and Coding Standard (Version 1.0)";
CRBIM1004—2017 "Railway Engineering Information Model Delivery Accuracy Standard (Version 1.0)";
CRBIM 1007-2017 "Guidelines for WBS Project Decomposition of Railway Engineering (Trial)";
GB/T 51235-2017 "Standard for Construction and Application of Building Information Modeling";
2.1 BIM modeling
The BIM family modeling in the project includes the establishment of a parametric model of the whole line and a model in front of the auxiliary station in the section from Liying to Xiong'an, including specialty: communication, signal, electric power, traction substation, catenary, auxiliary house of the four electrics, and professional in front of the station (line, track, bridge, roadbed, station yard, tunnel). In the modeling family building process of a project, there are two types of modeling: part-level models and component-level models. Part-level models are primarily reusable components, which are models created from design or supplier drawings that can be composed of components by nesting families. Component-level models, on the other hand, are combinations of parts that can achieve specialized functions, are created based on design drawings and related design instructions, and have certain parametric characteristics.
Part-level model Component-level model
2.2 In-depth application of BIM model
(1) Equipment installation optimization
The communication signal professional applies BIM technology, first of all, the indoor cabinet layout, cable tray laying, and the comprehensive lightning protection construction plan for collision detection, check whether there is a conflict with the air conditioner and gas fire extinguishing device, find the problem in advance and coordinate the design to solve it, and avoid rework. According to the construction, judge whether the equipment layout is reasonable, and make timely optimization and adjustment before construction to ensure the aesthetics and practicability of the indoor equipment layout.
BIM renderings after the implementation of the site drawing
(2) Collision check
BIM collision checking is designed to detect collisions and conflicts between various components, systems, or disciplines in a construction or infrastructure project. These collisions and clashes can cause problems during the construction or operational phase. Disciplines (e.g., structural, mechanical, electrical, plumbing, etc.) can integrate their design models into a comprehensive BIM model. BIM software can automatically analyze the relationships between individual components and identify potential conflicts. These conflicts can include pipe-to-column intersections, cable-pipe staggering, and so on. In the project, the BIM model is used to focus on the collision analysis between the building and the reserved embedded, the communication and the power, the signal and the power, and the communication and the signal to avoid unnecessary delays and cost increases.
(3) Deepening the drawing
The advantage of BIM detailed drawing is that it improves the accuracy and executability of the design, reduces problems and changes during the construction phase, and saves time and costs. In addition, the data from the BIM model can be continuously used through different phases of the project, from design and construction to maintenance, enabling full lifecycle management. By perfecting some of the complex wiring details in the project, BIM deepening drawings are generated, and the details of the detailed cable laying can be intuitively viewed, and the cables can be accurately deployed.
(4) BIM-based takeoff optimization
Through BIM technology, the layout of indoor cables can be planned in advance, the direction and level of cables, and each cable can be drawn out specifically through optimized design, and according to the naming rules, each cable can be added with attributes such as its function name, purpose, type, start and end sub and length. All kinds of cables are classified, layered, and arranged separately according to their use, model, and size, so that they do not cross or surround, and optimize the cable path.
In terms of model depth optimization, after the optimal path design of the cable is completed, BIM technology is used to calculate the amount of the cable. The on-site cable deployment is purchased according to the amount according to this table, and the amount is taken, which greatly reduces the waste of materials and greatly improves the work efficiency. Extract material reports from the model to provide reference data for material planning, and at the same time, guide on-site wiring construction through visual models to improve the refinement of construction.
(5) Optimization of special construction plans
The housing construction professional applies BIM technology to complete the special scheme for housing outer frame and formwork support, the calculation of the amount of reinforced civil engineering, the arrangement of bricks in the courtyard, the reservation of embedded pipeline interfaces, and the laying of indoor anti-static floors.
(6) Optimization of construction processes
Combined with the layout plan and the cross-sectional drawing of each trench section of the cable, the construction sequence of the cable is determined according to the principle of the cable bracket from top to bottom, so as to improve the laying efficiency and quality.
2.3 BIM construction management application
(1) Electronic sand table
The electronic sand table combines virtual reality, BIM modeling, geographic information system (GIS) and interactive visualization technology to provide users with a virtual reality environment with good interactive performance based on composite multimedia technology. As a participating unit of the major scientific research project of "Intelligent Beijing-Xiong Key Technology Research" of China Railway Group, our group participated in the related work of the sub-project "BIM+GIS Key Technology Application Research of the Beijing-Xiongxiong High-speed Railway", realized the integration of line information and geographic information, the intuitive distribution of work points, and the integration of construction information, and completed the "one map" integrated management of BIM+GIS for each work point of the Beijing-Xiongxiong Fourth Power Project.
(2) Based on BIM+GIS smart construction site
The management cockpit integrates and manages the project site monitoring, problem information, completion rate of each specialty, weather and other information, and visually displays the progress of the project in the form of charts. The problem information includes the handling of safety issues, quality issues, and the number of pending and completed safety quality issues in the form of labels. Through the integration, statistics and analysis of scheduling data, the completion rate of each specialty is formed, and the progress and completion of each specialty-work area-work site-sub-item are intuitively viewed.
The application of personnel positioning intelligent helmet can realize personnel positioning, video and image acquisition, communication and other functions, which is convenient for managers to obtain on-site conditions in a timely manner. In addition, helmet related information and platform to achieve data integration management.
The application of rail car positioning equipment, through video monitoring and positioning information, can grasp the operation of on-site personnel and the operation of rail cars in real time, which is convenient for management personnel to schedule and allocate resources, and improve the efficiency of safety management. The relevant data of the rail car positioning equipment interacts with the platform in real time.
(3) Wrist arm provisioning management
The BIM application management platform carries out standardized process management of wrist arm measurement, calculation, and provisioning data. The staff fills in the template provided by the wrist arm provisioning module of the platform and uploads it to initiate the review process, and after passing the review, the data required by the digital wrist arm processing platform can be generated for production and processing. The following figure shows the BIM-based provisioning management workflow.
During the data transfer process, the relevant wrist arm data is automatically associated with the BIM model. The digital wrist arm processing platform obtains production data from the BIM model through the interface for wrist arm pre-configuration processing, and the machine accesses the processing data such as production batch and processing time of wrist arm parts in the processing process through the interface and combines it with the model, so as to realize the whole-process integrated management of wrist arm pre-configuration data information.
(4) One rod and one gear management
With the model as the carrier, the data information related to the pillars is integrated to realize the dynamic expansion of the data of one rod and one file. By scanning the QR code of the device with your mobile phone, you can quickly view its detailed information in the attribute list, including various engineering information, associated component information, design drawings, real photos, etc.
(5) Cable management
The cable management module of the BIM application management platform sets the site, specialty, type and number of the cable to be queried, and the platform highlights the retrieved cable in green to display the cable path, and highlights the equipment connected at both ends of the cable in red, and can view the properties of related equipment and cables. The diagram shows the properties of the high-voltage switchgear to which the cable is connected.
Through the cable management function, on-site personnel can quickly inquire about the completion of cable laying, including connecting equipment at both ends of the cable, passing through the tray, layered information, etc., so as to realize information-based construction assistance and improve on-site construction efficiency.
(6) Document management
Pictures, drawings and documents are uploaded to the platform through the data management function of the platform for classification management and unique QR code generation, and the QR code can be transmitted in the form of mobile terminal sharing, printing, etc., and the corresponding content can be scanned and viewed by mobile phones, tablets and other devices at any time.
(7) Monitoring and management
Surveillance cameras with solar energy are deployed at some key sites, and on-board cameras (including positioning systems) are installed on rail cars, and by associating the cameras with actual geographic information, various monitoring projects can be displayed at the corresponding location of BIM+GIS maps, and the current construction situation of the project can be understood in real time.
(8) Visual process disclosure
According to the construction process standards and work instructions of various specialties, the BIM model was used to make visual process disclosure videos, and a total of 48 visual process disclosure libraries were formed. Among them, 15 are housing construction, catenary: 5, substation: 10, electricity: 1, disaster prevention: 1, communication: 11, signal: 5. The BIM application management platform manages the process library in a unified manner, creates a process QR code, and on-site personnel can scan the QR code through their mobile phones to view relevant visual process videos in real time.
(9) Progress management
The functions of this module include: 1. Combine the BIM model of the construction of the Beijing-Xiongxiong Intercity Railway with time and progress to realize the simulation of process flow, scheme and construction organization; 2. Collect the daily construction log of the operation team and summarize the construction progress; 3. Through the association between the component code and the WBS work code, realize the visual display of the progress of the log filling driving model (green: completed, yellow: under construction, red: lagging);4. Visual comparative analysis of the actual progress and task plan. The progress of the Lijiaxiang Village Sub-district is visualized as shown below.
(10) Safety and quality management
The functions of this module include: 1. Closed-loop management of the whole process of filling, processing, sales and archiving of safety/quality problems; 2. Associating safety/quality problems with BIM models to intuitively understand the location and status of problems in the platform; 3. By filling in the problems on the spot, obtaining the location of the problems, and visually viewing the problems in the three-dimensional sand table, the safety and quality problems are located on a map of BIM+GIS and the data integration is realized, which is convenient for rapid positioning of problems and timely disposal. As shown in the figure below.
3. Summary
(1) Through preliminary research and demand docking, complete the preparation of BIM application research report, project-level BIM application planning plan, and BIM application demand analysis report.
(2) A project-level BIM application standard system has been established to lay the foundation for the subsequent development of BIM applications.
(3) In the construction implementation stage, BIM technicians of various specialties go deep into the construction site to carry out BIM applications for the purpose of solving practical problems on site, improving work efficiency and reducing material loss.
(4) Through the BIM+GIS platform, the integration of information data, collaborative management and application, and interactive feedback of the whole process are realized, and the efficiency of process management such as safety, quality, progress, materials, and interfaces is improved.
Source: Railway BIM Alliance