Patent Number: 
Section: claims

1. An assembly comprising:a plurality of tubes having respective segments parallel to one another;a locking device for locking the tubes in position relative to one another, the device including:at least one first arm;a locking axle having a plurality of bearing surfaces; anda link connecting the locking axle to the first arm, the locking axle being movable relative to the first arm between a locking position, in which the segments of the tubes are each pinched between one of said bearing surfaces and the first arm, and a released position, in which the segments of the tubes are free relative to the first arm,the bearing surfaces being depressions hollowed along the locking axle. 2. The assembly as recited in claim 1 wherein the locking device comprises a second arm parallel to the first arm and connected to the first arm, and, in the locking position of the locking axle, the segments of a first set of the tubes are pinched between the first arm and the locking axle, and the segments of a second set of the tubes are pinched between the second arm and the locking axle. 3. The assembly as recited in claim 1 wherein the link of the locking axle to the first arm is a pivot link around a pivot axis. 4. The assembly as recited in claim 3 wherein the locking axle and the first arm have elongated shapes along the pivot axis, the locking axle extending along the pivot axis. 5. The assembly as recited in claim 1 wherein the locking axle comprises a deformable hollow sleeve defining the bearing surfaces and a lever engaged inside the sleeve, the lever being movable relative to the sleeve between a first position in which the bearing surfaces are in retracted positions relatively further from the first arm, and a second position in which the bearing surfaces are in protruding positions relatively closer to the first arm. 6. The assembly as recited in claim 1 wherein at a first end, the locking axle has a relief provided to cooperate with a tool for rotating the locking axle. 7. The assembly as recited in claim 1 wherein the locking axle is crimped on the first arm in the locking position. 8. The assembly as recited in claim 1 wherein the first arm and the locking axle define a rectilinear aperture therebetween in which the tube segments are received, the first arm bearing a wall closing a first end of said aperture and defining a bearing for guiding the rotation of the locking axle. 9. The assembly as recited in claim 8 wherein the first arm and the locking axle pinch the tube segments positioned therebetween in a pinching direction, the locking device having, at a second end of the aperture opposite the first, a removable link connecting the locking axle to the first arm preventing a mutual separation between the locking axle and the first arm in the pinching direction in the locking position of the locking axle. 10. The assembly as recited in claim 9 wherein the removable link closes the aperture at a second end thereof in the locking position of the locking axle and frees the second end in the released position of the locking axle. 11. The assembly as recited in claim 1 wherein the tubes are thermocouple pipes of a nuclear reactor. 12. A maintenance method for the assembly as recited in claim 1, the method comprising:placing the locking axle of the locking device in the released position;removing the locking device;performing maintenance on the defective tube;engaging the tube segments between the locking axle and the first arm of the locking device; andplacing the locking axle in the locking position. 13. An assembly comprising:a plurality of tubes having respective segments parallel to one another;a locking device for locking the tubes in position relative to one another, the locking device including:at least one first arm;a locking axle having a plurality of bearing surfaces; anda link connecting the locking axle to the first arm, the locking axle being movable relative to the first arm between a locking position, in which the segments of the tubes are each pinched between one of said bearing surfaces and the first arm, and a released position, in which the segments of the tubes are free relative to the first arm;the first arm and the locking axle defining a rectilinear aperture between them in which the tube segments are received, the first arm bearing a wall closing a first end of said aperture and defining a bearing for guiding the rotation of the locking axle;the first arm and the locking axle pinching the tube segments between the first arm and the locking axle in a pinching direction, the locking device having, at a second end of the aperture opposite the first, a removable link connecting the locking axle to the first arm preventing a mutual separation between the locking axle and the first arm in the pinching direction in the locking position of the locking axle. 14. The assembly as recited in claim 13 wherein the removable link closes the aperture at a second end thereof in the locking position of the locking axle and frees the second end in the released position of the locking axle.