On the morning of May 21, 2023, the Hongqimen Bridge of the South China Expressway, which was invested and constructed by the China Railway Bridge Bureau of Guangzhou Communications Investment Group, was closed. A bridge on the Pearl River estuary that highlights green development once again spans Guangzhou and Zhongshan to connect the Guangdong-Hong Kong-Macao Greater Bay Area and press the accelerator button.

The Nanzhong Expressway project is an important part of the National Highway G2518 and the Provincial Highway S78, and is a major transportation infrastructure project in the Guangdong-Hong Kong-Macao Greater Bay Area. The starting point of the main line of the project is connected to Nansha Port Expressway Xinken Interchange, and the end point is connected to Zhongjiang Expressway, which is connected to Xinlong Interchange of Guangzhou-Macao Expressway. The route is 21.6 kilometers long. The branch line of the project connects the main line and Shenzhen-Zhongshan Passage, and connects with Shenzhen-Zhongshan Passage at Wanqingsha Interchange , the route is 10.7 kilometers long.

The Hongqimen Bridge in Helong is one of the controlling projects of the South China Expressway project. The bridge has a total length of 1126 meters and a main span of 520 meters. The east and west towers are 178.5 meters and 176 meters high respectively. Beam cable-stayed bridge. The design of the bridge incorporates allegorical Lingnan cultural landscape elements. Its main tower is shaped like a kapok, light and lively, tall and beautiful, implying the meaning of moistening the bay area.

According to Liu Kai, the project manager of the TJ02 project department of the South China Expressway of China Railway Bridge Bureau, after the project won the bid, the project team of the design branch of the group company immediately entered the site and carried out the construction design work intensively, quickly completing the main trestle, the water drilling platform, the water and The construction design work of land cofferdam, main tower and steel box girder, among them, the No. 4 main trestle bridge is innovatively designed as a hoistable steel trestle bridge, which does not affect the navigation, which not only meets the construction requirements, but also meets the waterway requirements.

Faced with complex geological conditions, large-scale equipment and temporary facilities have high wind resistance requirements, high risks, high temperature, floods and severe weather, the project department vigorously introduced mechanical equipment to reform and innovate construction techniques.

KTY4000 rotary drilling rig and intelligent pile hole drilling system are applied in the pile foundation construction of Hongqimen Bridge. The system comes with automatic detection and adjustment of verticality and digital display of hole depth. It is not only easy to operate, but also has high automation and high hole forming efficiency. At the same time, a pile hole drilling device is installed in the drill bit, which can conduct real-time detection of pile hole parameters such as hole diameter, hole depth, verticality, drilling rig speed, mud pressure, displacement, etc., to ensure the quality of bored piles. It is 100% a first-class pile.

In the construction of the tower column, the project department has developed the prefabricated installation and construction technology of the entire section of the steel skeleton of the variable cross-section leaning tower with assembly design, automatic blanking, factory production, and rapid installation, which converts a large number of high-altitude operations into ground operations. , reducing the amount of personnel working at heights by more than 60%, achieving both quality and quantity.

The project department also adopts the tower-beam synchronous construction technology of walking and pushing, and erects the side-span steel box girder at the same time as the construction of the main tower, realizing synchronous jacking, longitudinal jacking and lateral correction during the erection process, ensuring the construction quality of the jacking process Safe and effective, the construction period was effectively saved by about 3 months, and the construction tasks were completed ahead of schedule to ensure the smooth closing of the bridge. The construction of many water resource protection areas and mangrove protection areas across the Nansha Wetland in the project has extremely strict environmental protection requirements.

Liu Weiliang, Secretary of the Party Branch of the South China Expressway TJ2 bid project of China Railway Bridge Bureau, introduced that in order to protect the ecological environment, the project implemented green construction on the basis of meeting the management requirements of differentiated chemical sites. The new technology of drilling slag and reuse can avoid polluting water bodies and blocking waterways.

At the same time, actively promote standardization construction, trestles, brackets and other large temporary structural projects are constructed using assembly technology, and promote the intensive automation of steel bar processing and concrete production. Influence.

The TJ02 contract section of Nanzhong Expressway undertaken by China Railway Major Bridge Bureau includes 13 bridges, including Hongqimen Bridge, Shazaijiao Bridge, and Erjiaoli Bridge, accounting for 100% of the total. The proportion of bridges is high, and the requirements for safety and quality management are also higher. In order to better improve the safety awareness and skill level of employees and prevent safety accidents, the project department has built a 2+6 industrial worker training center, set up more than 20 teaching modules, and trained all industrial workers in turn in an immersive teaching method. By continuously increasing training in engineering technology, safety and quality, etc., we have achieved 100% technical disclosure and 100% coverage of entry safety training, and enhanced the safety production awareness and skill level of industrial personnel.

The project department conducts regular physical examinations for high-altitude and high-risk workers; during the epidemic period, closed management and regular inspections for all employees have taken multiple measures to enhance the physical and mental safety of industrial personnel. No safety and quality accidents have occurred since the project started construction.

It is reported that after the completion of the Nanzhong Expressway project, it will further enhance the role of Guangzhou's core engine and the connection of Zhongshan nodes, linking up the east-west, south-north passages in the core area of the Greater Bay Area, and boosting the economic and social development of the Greater Bay Area. As a direct expressway from Nansha, Guangzhou to Zhongshan, the round trip between the two places is expected to be shortened by 30 minutes in the future. Editor/Wang Yan