When the doors of the new Mineirão are reopened on December 21st this year, the date set by the government of Minas Gerais for the first match after the reform, fans will see a few aspects of the stadium opened in September 1965.
The 130,000 seats were replaced by only 64,000 seats. The old cover will be extended from the current 26 meters to 52 meters. The upper bleachers, which were maintained, will be fully repaired. The lower bleachers, which were demolished and rebuilt, will have a 10,700 m² VIP area, which will house 80 corporate boxes for a total of 2,100 seats.
The interconnection of Mineirão with Mineirinho gym, which will be made through a 15-meter footbridge over Antônio Abraão Caram avenue, is one of the starting points of the executive project. According to the architect Bruno Campos, from BCMF office, responsible for the work, the project of the new Mineirão included the maintenance of the stadium facade, declared a listed building by the Historic Cultural Heritage. "The frame of Mineirão, the 88 structural pylons, the concrete cover and the upper bleachers were basically kept," the architect said.
He also highlights the benefits of the terrace, which will have spaces with more possibilities for leisure and entertainment. It will have three levels and areas intended for the audience through vertical sectorization associated to the usual, horizontal. "The urbanistic relation of the sports complex with Pampulha lake and its immediate neighborhood is important, taking into account the conditions and demands during the event and also its impact as a self-sustainable legacy for the city," Campos said.
After the end of the bidding, the consortium guided the architects to undertake revisions in the executive project. According to Secopa, the determinations were already provided in the notice to bid. The complex commercial exploitation was also one of the points of change.
"The proposed interventions intended to bring the innovations required to transform Mineirão in a modern sports complex in terms of technology and sustainability, and multifunctional with respect to the potential of operation," the CEO of Minas Arena, Ricardo Barra, said.
Regarding the new cover, the extension will be done by means of metal structures. According to Campos, there will be a new "self cleaning" membrane cover supported by flat trusses composed of steel pipes.
They will be incorporated into the existing part so that there is increased resistance of the assembly. The current concrete cover then will undergo stress relief by means of a prestressing and jacking up work. The cables will produce lighter structures, with high performance. The technique will be responsible for the balance cover of the stadium.
The new structure will also receive photovoltaic panels. They will be installed on the cover and absorb solar energy, which will be transformed into electrical energy. In total, there will be seven thousand panels, with an average size of 1.5 m², each weighing 30 kg.
It is expected that the plant will produce 2,200 megawatts per year, equivalent to the average consumption of two thousand homes. The installed capacity will be 1.5 MW, and the installation of the panels will be performed by Companhia Energética de Minas Gerais (Cemig).
The new lawn of the stadium, according to the consortium Minas Arenas, should be planted in October. The intention is to have 100% of the lawn planted still in 2012.
The tournaments will be played in the first half of next year. Then, in June, the stadium will receive some matches of the Confederations Cup. A year later, Mineirão will host six World Cup matches.
Two companies provided the pre-molded pieces for the lower bleachers and the terrace. Precon and Premo, located in the Greater Belo Horizonte, in the cities of Pedro Leopoldo and Vespasiano, respectively.
According to Ana Margarida Vieira, project manager of Premo, the pieces are produced in the factories without the need to stock them in the construction sites. "The prefabricated pieces are brought to Mineirão and assembled on site," she said.
The just-in-time methodology allows the pre-molded pieces to be unloaded and installed immediately.Thus, there is a reduction of handling equipment at the construction site, providing more safety to the two thousand workers.
For example, the slabs, which are between 21.5 cm and 26 cm high and have 6.5 cm of capping, will occupy more than 80% of the terrace.
Marcelo Miranda, executive director of Precon Engenharia, also highlights two benefits of the school: the agility of the work and development character. "There is no accumulation of waste, because it is an industry-performed construction," he said.
For the architect Bruno Campos, the biggest advantage of using the prefabricated system was to optimize the execution time. "The manufacture of concrete pieces was done outside the construction site and occurred simultaneously with the work foundation and earthworks."