Guangzhou has built the first expressway mileage in the province, and the main skeleton road network of ＂Three Rings+Nineteen Shoots＂ has basically taken shape.

Guangzhou has built a high-speed highway, ranking first in the province. The "three-ring+nineteen-shot" main skeleton road network basically formed the northern section of the second airport expressway. On December 30, the northern section of the second airport expressway invested and constructed by Guangzhou Jiaotou Group passed the handover acceptance and was open to traffic. After this section is opened to traffic, a second high-speed passage will be added directly to Baiyun Airport, so that citizens in the north and east of Guangzhou will not need to detour by plane. The North Section of the Second Airport Expressway connects the North Second Ring Expressway, Huaguan Expressway and other national highways such as G106 and S118, forming a closed-loop regional traffic pattern of Guangzhou Airport and a new northbound exit passage, which will further enhance the distribution capacity of Baiyun Airport and accelerate the development of the airport economic zone, and play an important role in improving the layout of Guangzhou expressway network, alleviating the "bottleneck" of northbound exit traffic in Guangzhou, constructing the Pan-Pearl River Delta expressway pattern centered on Guangzhou, and promoting the interconnection of Guangdong-Hong Kong-Macao Greater Bay Area. Up to now, Guangzhou has built a high-speed highway with a mileage of over 1,100 kilometers, ranking first in the province in terms of construction scale, and the "three-ring+nineteen-shot" main skeleton road network has basically taken shape. Avoid congestion and bypass to build a second high-speed passage through the airport. "Driving to Baiyun Airport, the airport expressway is the only way." Mr. Li told reporters. However, on holidays, the traffic volume increases, and the airport expressway is often congested. "Leave some time in advance for holidays in case the traffic jam can’t catch up with the plane." With the opening of the northern section of the airport’s second expressway, Mr. Li’s worries will be effectively alleviated.The second expressway of the airport starts from Shanqian Interchange on the north extension line of the airport expressway and ends at Huangcun Interchange on Guangzhou-Shenzhen Expressway, with a total length of 44.46 kilometers. The project is roughly bounded by the North Second Ring Expressway and is divided into the northern section and the southern section. The northern section of the project is 22.11 kilometers (including 1.36 kilometers of connecting lines), with the construction standard of 8 lanes in two directions and the design speed of 100 kilometers per hour, with 7 interchanges and 1 management center. After the opening of the North Section of the Second Airport Expressway, the high-speed network around Baiyun Airport forms a closed loop, and citizens have one more route to choose from to go to the T1 and T2 terminals of Baiyun Airport or the surrounding area. They can drive from the North Section of the Second Airport Expressway to Fanghua Road and then to the T1 terminal via T3 interchange. In the future, after the planned road at the airport is completed and opened to traffic, the accessibility of the road network will be further improved. Citizens can switch from the airport north interchange to the T2 terminal and from the T3 interchange to the T3 (planned) terminal, which will effectively alleviate the traffic congestion of citizens during holidays, and citizens in Huadu District and Baiyun District can also reduce road detours when going to the airport. It is reported that the south section of the second expressway of the airport has started construction in an all-round way. When it is completed and opened to traffic, it will connect the northern section of the project and China Unicom’s seven expressways, and become an important highway hub in Guangdong-Hong Kong-Macao Greater Bay Area, further improving the "three-ring+nineteen-shot" expressway network, focusing on upgrading the energy level of the external expressway corridors in the directions of Guanghui, Guang ‘ao, Guangzhao and Guangqing, helping to build a Pan-Pearl River Delta expressway network with Guangzhou as the center and create a "one-hour traffic circle" in Guangdong-Hong Kong-Macao Greater Bay Area."After the second expressway of the airport is opened to traffic, the driving time from Tianhe to Baiyun Airport will be shortened from 1 hour to 30 minutes, and it will also become the fastest way for major cities in Guangdong-Hong Kong-Macao Greater Bay Area such as Dongguan, Foshan and Zhaoqing to go to Baiyun Airport." The person in charge of the second expressway project at the airport said. Insist on green and intensive construction to build Guangzhou Expressway demonstration project. The northern section of the second expressway of the airport passes through urban dense areas, crossing (passing through) high expressways, national and provincial highways and rapidly transforming roads, railways and subways for many times. The buildings (structures) and pipelines along the line are complicated and the construction requirements are extremely high. In this regard, Guangzhou Jiaotou Group has always adhered to the new development concept, focusing on intensive land conservation, safe construction and green construction. In the overall scheme selection, the route should be optimized on the principle of occupying cultivated land, fertile land and economic forest as little as possible; In the design stage, bridge structure should be adopted as much as possible to reduce the land occupation; Minimize temporary land occupation during the construction stage; After completion, vegetation, cultivated land and municipal roads will be restored in time. In addition, rainwater collection and accident emergency pools are set up on the road section passing through the water source protection area, and rainwater and sewage on the road surface are collected and treated centrally; Sound insulation and noise reduction measures are adopted in the road sections passing through environmentally sensitive points such as villages, campuses and residential areas, such as SMA, OGFC and PAC combined noise reduction pavement and fully enclosed sound insulation screen, so as to minimize the impact on the surrounding environment. It is understood that there are two underpass tunnels in the northern section of the second expressway of the airport.They are the airport north tunnel, the longest two-way eight-lane expressway in China with a length of 3,012m, and the airport south tunnel, the widest expressway in China with a length of 1,100m. By adopting the scheme of underpass tunnel, the environmental friendliness is improved and the construction difficulty is also increased. "Airport North Tunnel is located next to Liuxi River, with complex geological environment and great risk of collapse." The person in charge of the project said. In order to overcome the construction difficulties, geological conditions are taken as an important consideration in the scheme design of the north section of the second expressway of the airport, and the scheme is dynamically adjusted during the construction, and measures such as real-time monitoring and strengthening protection are taken to ensure the construction safety. At the same time, the northern section of the second expressway of the airport makes the best use of the existing corridor resources in route selection, creates a three-dimensional traffic system and releases the urban development space. "For example, in the section of National Highway 106, there is a subway under it, with National Highway 106 in the middle and the second expressway above the airport." The project leader introduced. The project also innovated the way of pipeline relocation. For the first time in Guangzhou expressway construction industry, the comprehensive pipeline relocation unit was selected by public bidding, and multiple pipeline relocation routes were optimized by design and construction general contracting, and all pipeline property rights units were organized to participate in the design scheme discussion, breaking the "fragmented" situation of pipeline relocation, which not only greatly reduced the amount of land occupation and house demolition, saved investment costs, but also provided orderly pipe network layout support for future road network improvement.Promote innovation and empower BIM technology to lead smart construction sites to build the second high-speed airport project. BIM technology is also widely used in site construction and management, effectively solving construction problems in complex environments. According to reports, BIM technology is based on three-dimensional digital technology, which combines the BIM model established in the early stage with the surrounding real terrain, environment and other data through multi-channel image fusion technology to generate a real digital virtual sand table of the project, and escorts the project construction by intelligent means. How to move the pipeline? The model predicts first. The airport second expressway project innovatively uses "GIS+BIM" technology to establish a virtual digital sand table, and generates a visual three-dimensional model of the invisible underground pipeline. "Through the BIM model, the pipeline relocation can be arranged in advance. For example, seeing the close relationship between the pipeline and the subway and finding the conflict point of the pipeline relocation will make the actual operation more organized." The project leader said. The northern section of the project involves the construction of G106 bridge pier, capping beam and steel box beam, as well as the prefabrication and erection of beam and slab. The project adopts BIM technology to build an all-round three-dimensional real-life model communication platform, observe the site construction in 360 degrees in real time, strengthen the deep interaction between the project company and the construction unit, realize the scientific, standardized and intelligent management of the project based on BIM technology, and speed up the progress of the project. With this technology, the SG08 contract section of the North Section of the Second Airport Expressway completed an output value of 80 million yuan in a single month, setting a new record for the monthly output value of the bridge standard. It is understood that,The research results of the project on BIM technology also won many honors, such as the third place in the BIM application category of bridges and tunnels in the 10th imagine cup Building Information Model (BIM) Application Competition. Expand the skill competition mode, and the provincial key project labor competition will boost the project construction. During the construction process, the northern section of the second expressway of the airport will also vigorously carry out the provincial key project labor competition to adapt to the development of the new era. By expanding the depth of labor competition and innovating the skill competition mode, the construction upsurge of catching up with learning will be set off in the whole project, which will effectively promote the high-quality and efficient construction of the project. It is understood that since 2017, the project has carried out a series of labor competition activities such as "attacking the city and pulling out the village", "taking root", "flowering results" and "making new achievements", with the goal of "model project, clean project and quality project". Through a series of skill competitions, such as steel bar welding and upsetting straight thread sleeve connection, experimental testing practice, engineering survey practice, New Jersey guardrail steel bar binding and pouring, and the appraisal of craftsmen’s construction teams, post experts (pacesetters), advanced collectives and individuals, technical exchanges and mutual promotion have been realized, and the simple production and physical labor competition has been upgraded into an intelligent and scientific research competition, and four advanced collectives and three winners of Guangdong May 1 Labor Medal have emerged.