This formwork had large surface area, ensured the flatness, could be used for many times and known as the most modern at that time. Following to the Yaly HPP, Tuyen Quang HPP, Son La HPP… the employees of Song Da fabricated the formworks of dimensions: 2mx5m, 3mx5m which had small and simple structures to apply for the concrete work at spillway, water intake.
After Son La HPP was completed successfully, Song Da 5 JSC has been entrusted with the construction of concrete structures in Lai Chau HPP. Passing over years working in special projects, Deputy General Director, engineer Do Quang Loi and other colleagues concerned about the production of large sheet formwork that are suitable to Vietnamese conditions. He paid a visit to the countries of development industry to study formworks.
(External truss formwork is being installed at the water intake of Lai Chau HPP, Picture from Minh Soi)
The heavy overhanging formwork of Russia with very high cost of material that caused difficulties for workers in installation while the lighter formwork of DOKA (India) that is easy for installation but they are special and costly. From those issues, the new tasks were assigned to the engineer Le Anh Duc and his colleagues of Technical Department. In May 2012, external truss formwork was produced for the first time at the workshop of Song Da 5 JSC which was located in the left bank of Lai Chau HPP.
A week after finishing, the external truss formwork was installed by the workers of Song Da 5.06 enterprise at water intake with the high accuracy. The greatest advantages of external truss formwork are the fast installation, dismantlement, the easy adjustment by manual, the convenience and safety. The low production costs thanks to the reuse of all available materials in the country. This formwork creates the nice surface of concrete, mutil-turn concrete which is suitable for massive concrete block.
The successful fabrication and application of external truss formwork confirms the internal capability and the mind of officers and engineers of Song Da 5 JSC in the renewal trends and the modern construction technology development.
.jpg)
