On June 16, the special railway from Dabilón Port to Shengtu Mining Area in Guinea, which was built by the 14th Bureau of China Railway, was officially opened to traffic, filling the historical gap in the construction of modern railways in Guinea. President Alpha Conte of the Republic of Guinea, Minister of Mining and Geology Abdulaye Maca Suba, Economic and Commercial Counsellor Wang Baozhong of the Chinese Embassy in Guinea, Sun Xiushun, commander-in-chief of the Winning Alliance, and government officials where the project is located attended the ceremony.

The President of Guinea praises the Dasheng Railway and laments the speed of China

The railway has a total length of 125 kilometers and a design speed of 80 kilometers per hour. The total length of the third bid section undertaken by China Railway 14th Bureau is 36.3 kilometers, and the proportion of bridges and tunnels is 21.7%. Among all the bid sections on the whole line, the geology is the most complicated and the construction difficulty is the most difficult. In addition to the tight construction period, the lack of materials and equipment, the harsh natural conditions, and the difficulty of construction in the rainy season, the builders also overcome the impact of the new crown pneumonia epidemic, emphasized both "prevention" and "production", and successfully completed the construction tasks.

Set 3 records in a row, China Railway 14th Bureau gnawed the 3 hardest bones on the whole line

Since the start of construction, the builders have refreshed the history of Guinea’s railway construction three times. They have respectively built the first tunnel in Guinea since modern times-the Gedgili Tunnel, the longest tunnel-the Gula high-conducting tunnel, and the current 46.5-meter high pier in Guinea. .

With a total length of 2,833 meters, the Gula high-drainage tunnel is a key control project of the Dasheng Railway. The builders are also faced with the difficulty of having no construction experience in the same area. It is a veritable "hard bone" project. In the face of complex ground materials, heavy rainfall in the rainy season, and year-round high temperature, the laboratory started from the source, and the aggregates were sampled at high frequency. The mud content of the aggregate was strictly controlled during the rainy season. The concrete must be followed at the opening of the market and must be seen at the opening of the market. , Strictly control the water-binder ratio to ensure the stability and reliability of the concrete quality, and successfully solve the 46.5-meter high pier concrete pumping problem.

Let Chinese standards and Chinese technologies take root overseas

Since the construction of the tunnel, the safety risks such as the length of the shallow buried section of the inlet and outlet, the poor bearing capacity of the clay, the roof fall, the collapse, and the falling block have been restricting the construction progress. To this end, the project department formulated the "Tunnel Construction Operation Guide", which realized the smooth excavation of the tunnel, and the highest monthly excavation footage of a single tunnel entrance was 216.4 meters. The laboratory strictly implements relevant testing parameters in accordance with the latest domestic railway industry testing standards and specifications. All raw materials and engineering structures are tested in accordance with Chinese standards. The high quality guarantees the standardization of railway construction.

In order to ensure the supply of materials and rationally recycle resources, the builders make full use of the tunnel ballast to process graded gravel and sand. Due to the tight supply of machine-made sand, the project department purchased the sand making machine and processed the machine-made sand by returning to the furnace.

In order to overcome the impact of the new crown pneumonia epidemic, the builders are strict, tight and meticulous in the prevention and control of the epidemic, taking "foreign defense input" and "daily prevention and control" as the focus of epidemic prevention and control, and implementing a fully closed management system. Establish quarantine stations in key locations, and strictly implement temperature measurement and registration systems. A total of 1,255 nucleic acid screenings have been conducted for employees in China and Guinea, and nearly 200 people have been vaccinated against the new crown in Guinea.

The construction of the railway all adopted Chinese standards, Chinese technology, and Chinese equipment. This is the first time that China Railway Construction has entered the West African Guinea market, adding a touch of color to the Chinese railway's global expansion. The completion and opening of the railway marks the modernization of Guinea's railway operations. It will serve the mining and allocation of domestic bauxite resources in Guinea, help strengthen Guinea's dominant position in the global bauxite market, and is of great significance to the economic and social development of Guinea.Editor/Sang Xiaomei