Platform for accessing a hydraulic machine and methods for installing and disassembling such a platform in a suction tube

1. A platform for accessing a hydraulic machine via a suction tube, this hydraulic machine belonging to an installation for converting hydraulic energy into mechanical or electrical energy, or reciprocally, the platform comprising:

load-bearing longitudinal beams configured to slide along a longitudinal axis to enter an opening of the suction tube and including a first extremity that is configured to be immobilized in a first seat of the suction tube; and

floor elements placed on the load-bearing longitudinal beams, at least one of the floor elements being articulated about axes substantially parallel to the longitudinal axis and being movable in rotation about the axes substantially parallel to the longitudinal axes between a folded configuration and a deployed configuration in which they define at least a portion of a floor of the platform,

wherein lower surfaces of the floor elements carry the longitudinal beams including the first extremity configured to be selectively fitted into the first seat of the suction tube;

the first extremity of the longitudinal beams includes a first automatic engagement mechanism;

the first automatic engagement mechanism comprises a first rod and first elastic loading means pushing the first rod towards the first seat of the suction tube; and

the first rod is mounted tiltingly about an axis substantially perpendicular to a thickness of the longitudinal beams and in that a movement of the longitudinal beams in a direction normal to the floor tilts the first rod such that the first rod comes out of the first seat.

2. The platform according to claim 1 , wherein the first elastic loading means comprises a first spring configured to move the first rod in a direction substantially parallel to a length of the longitudinal beam and oriented towards the wall of the suction tube.

3. The platform according to claim 1 , wherein, when the articulated floor elements are in deployed configuration, the width of the floor defined by the articulated floor elements is more than 6 meters.

4. The platform according to claim 1 , comprising:

at least one small beam articulated with the longitudinal beams and configured to bear at least one complementary floor element of the articulated floor elements and the at least one small beam including a second extremity configured to be selectively fitted into a second seat of the suction tube;

wherein the second extremity of the at least one small beam includes a second automatic engagement mechanism;

the second automatic engagement mechanism includes a second rod and second elastic loading means pushing the second rod towards the second seat of the suction tube;

the second rod is mounted tiltingly about an axis substantially perpendicular to a thickness of the at least one small beam and in that a movement of the at least one small beam in a direction normal to the floor tilts the second rod such that the second rod comes out of the second seat.

5. The platform according to claim 4 , wherein the second elastic loading means comprises a second spring configured to move the second rod in a direction substantially parallel to a length of the small beam and oriented towards the wall of the suction tube.

6. A platform for accessing a hydraulic machine via a suction tube, this hydraulic machine belonging to an installation for converting hydraulic energy into mechanical or electrical energy, or reciprocally, the platform comprising:

load-bearing longitudinal beams configured to slide along a longitudinal axis to enter an opening of the suction tube; and

floor elements that are placed on the load-bearing longitudinal beams, at least one of the floor elements being articulated about axes substantially parallel to the longitudinal axis and being movable in rotation about the axes substantially parallel to the longitudinal axes between a folded configuration and a deployed configuration in which they define at least a portion of a floor of the platform,

at least one small beam articulated with the longitudinal beams and configured to bear at least one complementary floor element of the articulated floor elements and the at least one small beam including an extremity configured to be selectively fitted into a seat of the suction tube;

wherein the extremity of the at least one small beam includes an automatic engagement mechanism;

the automatic engagement mechanism includes a rod and an elastic loading means pushing the rod towards the seat of the suction tube; and

the rod is mounted tiltingly about an axis substantially perpendicular to a thickness of the at least one small beam and in that a movement of the at least one small beam in a direction normal to the floor tilts the rod such that the rod comes out of the seat.

7. A method for installing a platform according to claim 6 inside the suction tube of a hydraulic machine; the method comprising:

a) inserting the load-bearing longitudinal beams in the opening by sliding it along the longitudinal axis,

b) immobilizing the load-bearing longitudinal beams in the suction tube, and

c) unfolding the articulated floor elements.

8. The method according to claim 7 , wherein further comprising:

d) immobilizing the extremities of the longitudinal beams in the suction tube,

e) unfolding the small beams,

f) immobilizing the extremities of the small beams in the suction tube, and

g) attaching the complementary floor elements to the small beams.

9. A method for disassembling a platform according to claim 1 installed inside the suction tube of a hydraulic machine, comprising:

m) pivoting the articulated floor elements to the folded configuration,

n) releasing the extremity of the load-bearing longitudinal beams from the suction tube, and by sliding it axially into the opening of the suction tube.

10. The method according to claim 9 , includes the automatic deactivation of the engagement mechanism.