**3. Data driven construction measurement and control technology for ballastless track of high-speed railway**

Using new generation information technologies such as big data, mobile Internet, edge computing, etc., based on the digital design results of track engineering, and data driven mode, the intelligent construction measurement and control mode of "data perception, real-time transmission, dynamic analysis" was established by using the data automatic acquisition and measurement of total station, track inspection trolley, measurement and control terminal, etc.

*Perspective Chapter: Intelligent Construction Technology of Ballastless Track for High-Speed… DOI: http://dx.doi.org/10.5772/intechopen.109611*

**Figure 7.**

*Intelligent measurement and control scheme based on data drive.*

The portable intelligent measurement and control terminal, fine tuning robot and rail geometry and position information acquisition device were developed. The data interface of the whole process of design and construction has been opened up, and the automatic measurement and control of key processes of ballastless track, such as base laying and positioning, track slab fine adjustment, track panel fine adjustment and rail fine adjustment, has been realized, which improves efficiency and reduces manual inputs. It realizes the interaction and flow of "design, measurement and control, feedback" of construction information flow. The GeoCom communication technology is used to open the control interface with the measuring robot, realize the wireless communication and automatic control with the measuring robot, realize the automatic calculation of fine adjustment deviation, and complete the wireless upload of fine adjustment results to the management and control platform (**Figure 7**).

### **3.1 Base laying and positioning based on data drive**

Through the CP III control network and digital design results, the station setting of the measuring robot is completed. The terminal is used to control the measuring robot wirelessly to realize automatic measurement of base plate lofting. At the same time, the elevation measurement data of the subgrade surface, beam surface and other offline foundations are obtained, and the elevation deviation is obtained through realtime comparison with the digital design results. This determines the influence of beam surface elevation before the construction of the base, the base thickness adjustment scheme, automatically generates the formwork height of the base, and realizes the accurate control of the plane position, elevation and thickness of the base (**Figure 8**).

#### **3.2 Fine adjustment of track slab based on data drive**

The fine adjustment of track slab is basically a precise measurement in the installation stage, that is, the key point measurement or setting out of the track slab under to acheive the design theoretical position. During the preparation for fine adjustment, the process uses curve elements, slope information, long and short chains, other basic information and dynamic calculation modules to calculate the three-dimensional


**Figure 8.** *Schematic diagram of base laying and positioning process based on data drive.*

coordinates of the rail support platform based on the positional mileage of the track slab. A measuring frame accurately matched with a bolt hole is placed on the rail support platform. A prism for the identification by the measuring robot is installed in the center of the frame. The intelligent measuring robot is used to collect the threedimensional coordinates of the prism at the corresponding point and send them to the mobile terminal. The measurement and adjustment software automatically analyzes, compares and calculates between the measured coordinates and the design coordinates in real time to form the geometric position deviation under the threedimensional space of the track slab at the rail support platform. The fine adjustment robot is controlled according to the deviation to complete automatic adjustment (**Figure 9**).

**Figure 9.** *Schematic diagram of track slab fine adjustment scheme based on data drive.*
