Combustion chamber having a double chamber bottom

A gas turbomachine having a combustion chamber, the combustion chamber comprising:

• two walls which are an inner wall and an outer wall, respectively,
• a chamber bottom comprising an upstream wall and a downstream wall extending between said inner wall and outer wall and comprising mounting openings for mounting fuel injection devices for injecting fuel through said mounting openings, the downstream wall having sectors, and,
• wherein, for a support on the upstream wall, the downstream wall comprises:
• at an outer periphery of the downstream wall, a first upstream facing annular flange, and,
• at an inner periphery of the downstream wall, a second upstream facing annular flange, wherein the upstream wall comprises:
• at least one hole passing through the upstream wall and adapted to receive fixation means for fixing the upstream wall to the outer wall,
• at an outer periphery of the upstream wall, a third upstream facing annular flange for attachment to an upstream end of the outer wall, and
• at an inner periphery of the upstream wall, a fourth upstream facing annular flange for attachment to an upstream end of the inner wall, and
• wherein the downstream wall is fixed to the upstream wall by the first and second upstream facing annular flanges of the downstream wall being respectively shrunk around and contacting the third and fourth upstream facing annular flanges of the upstream wall.