Topcon Variable Construction Control SystemSince 2017, it has been used in the runway renovation project of Frankfurt International Airport.，It is widely used abroad. F1 track、High-grade pavement renovation projects such as airport runways and highways，The results are remarkable。Nowadays，The system has been applied and verified in many highway projects in China.。Topcon 3D mmGPS Spreading/Milling control system，Based on 3D Digital construction design model，Realize the automation of paving and milling operation，It has many advantages。
Topcon 3DIntelligent construction system successively in Beijing-Kunming Expressway、Terracotta Warriors and Horses Expressway、It is widely used in the paving and milling operations of important traffic trunk lines such as Qutai Expressway.。
Beijing-Kunming Expressway 3DVariable milling application
Beijing-Kunming Expressway，Beijing—Kunming Expressway，Total length 2715.059 kilometers。The reconstructed and expanded section from Pucheng to Laoyu，Design speed 120 km/Hour，The roadbed is 42 meters wide.，Total length 125.8 kilometers，Constructed according to the standard of two-way eight lanes，Adopt the mode of splicing and widening on both sides，Road surface miscellaneous soil shall be removed、Milling the original pavement layer and paving the structural layer layer by layer。At the asphalt paving stage，Application in areas with poor flatness of local bearing layer such as bridge deck 3D Millimeter Variable Precision Milling System，Average milling depth 3mm，And that smoothness of the pavement to be pave is improved.，Create conditions for high-quality asphalt paving。
The variable milling operation is based on the existing pavement and the milled design surface.（Milling thickness）Is the data base，By means of automatic control technology，CombineGNSSPositioning technology and high-precision sensors，Automatically control that lifting of the mil drum，Realize digitalization of milling and planing operation，Intelligent control，Finally, the construction effect of variable milling and planing with millimeter-level precision is realized.。
Terracotta Warriors Special Line 3DPaving application，Duration 01:01
The Terracotta Warriors and Horses Highway Reconstruction and Expansion Project starts from the Terracotta Warriors and Horses Interchange of Lianhuo Expressway.，The destination is Hujiazhai Village, Daiwang Street.，The total length of the route is 6.15 kilometers。The main line of the project adopts the technical standard of two-way four-lane expressway.，Design speed up to 100 km/Hour。At present，The main reconstruction and expansion project of the Terracotta Warriors and Horses Special Highway has been basically completed.，Efforts are being made to improve the road appearance.，Ancillary works such as building construction、Traffic safety、Electromechanical、Greening and other processes are also in full swing.。According to plan，By the end of September, the project will be open to traffic.，At that time, there will not only be a distinctive toll station shed on this road.，There will also be the first in Shaanxi.“Unattended”Toll station。
During the construction of the Terracotta Warriors and Horses Special Highway Reconstruction and Expansion Project，The project pavement management team has increased the input of intelligent construction technology.，Apply Pavement 3D Digital Intelligent Paving Technology。This technology not only significantly improves the accuracy of construction,，It ensures the smoothness and stability of the road surface.，But also greatly shorten that construction period.，And that cost is reduce。
Topcon 3DPaving technology is to install automatic control system and airborne equipment on the traditional Paver.，Through the sensor, the whole process of artificially controlled data is converted into data that can be read by the construction machinery.，Thereby controlling the operation of the machine。It's like an intelligent navigator.，It can guide the Paver to pave the water-stabilized base that meets the design requirements.。Vertical positioning elevation by using a laser，Plane Coordinate Positioning by Reference Station，Through office processing software，Enter road design parameters，Form three-dimensional coordinate data，Real-time transmission to Paver controller，The control machine compares the obtained data with the design data，And then transmit that elevation correction information to the control machine.，Command issued by control machine，Drive the hydraulic cylinder of the paver through the hydraulic valve to adjust the screed in the corresponding direction.，So that that elevation and the slope of the pave surface are changed，Make up for the fluctuation of road surface，Realize the pavement evenness and thickness required by the design。
Qutai Expressway 3DMilling applications
The reconstruction and expansion project of Qujiang-Taiyigong section of Baomao Expressway is nearing completion.，It is planned that the whole line will be opened to traffic at the end of September.！
Qutai Project starts from Qujiang Junction Interchange，Stop at Taiyigong Interchange，The total length of the route is 18.531 kilometers。Among，The interchange section from Qujiang Hub Interchange to Wangmang Hub is a two-way eight-lane section.，Design speed up to 100 km/Hour；The interchange from Wangmang Hub to Taiyigong Interchange is a two-way six-lane interchange.，The design speed is 80 kilometers./Hour。
Since the commencement of the project，Scientific Planning of Xiqu Reconstruction and Expansion Management Office、Carefully organized，Ensure the solid landing of all tasks。Vigorously promote mechanization、Intelligent construction and advanced and applicable construction methods，Significantly improve the level of construction standardization，Make every effort to build quality engineering。Pavement construction fully adopts high precision 3D Paving control system and 3D Milling control system，Paving was successfully achieved、Milling and planing operations“Digital management、Full process control”Aim。
The traditional milling process often adopts the operation mode of equal thickness or marked thickness.，Milling quality excessively depends on the level of manual operation，It is easy to have low milling precision.、Poor flatness of milling surface, etc.，Directly affect the quality of renovation，It also causes material waste.。And 3DThe milling solution fundamentally solves the difficulty in organizing and implementing the traditional milling process.、Typical pain points such as low operation control accuracy。
Topcon 3DmmGPSThe automatic control system of that mil machine consists of a reference station,、Milling Machine airborne equipment and mobile detection equipment.。Wherein the reference station apparatus compriseGNSSReference station receiver andLZ-T5 Domain Laser Transmitter；The airborne equipment includes a laser receiver.、MC-R3 Receiver、Data cable assembly、Display and data link receiving module；The mobile detection device includeGNSS&Domain laser mobile station system。Airborne equipment and mobile detection equipment contain operating software to implement the corresponding functions.，The graphical interface is convenient for operators to control.。
Convert the horizontal and vertical curves of the road into construction curves before constructionBIMModel，During construction，Erected on the control pointGNSSReference stations andLZ-T5 Laser transmitter，WillGPSDifferential signal and laser elevation information via data link radio and cable（Laser elevation information）Transmit toMC-R3 Receiver。MC-R3 After processing the received data，And transmit the three-dimensional coordinate data toGXSeries control box，The control box compares the obtained current three-dimensional coordinate information with the design data in the control box，Generate corresponding elevation correction information，This information is used to control the lifting of the milling drum，O as to mill the pavement meeting the requirements of design flatness and thickness.。At the same time，Can be usedmmGPSReal-time monitoring of pavement milling conditions by mobile station，Real realization of process monitoring construction，Meet the requirements of milling design。
TOPCON 3D Advantages of digital intelligent paving technology：
Through the establishment of digital model，Realize the efficient mode of transition and construction，Effectively shorten the construction period，Ensure and greatly improve the construction quality；
Effectively solve the problem of pavement flatness caused by local formation of subgrade；
Piling is not required、Lofting operation，And that construction difficulty and the auxiliary labor input level are reduce.；
The construction process is not limited by light conditions.，Can easily achieve 24 hours of uninterrupted construction；
The system is easy to operate，The construction process is simplified.，Ensure the smooth implementation of the project；
Real-time display of construction report，Let the construction site control the construction effect at any time，Avoid rework and other problems that may be caused by control after the event。
Contribution：The article is reposted from Qisheng Lianda official account.
