Patent Number: 
Section: claims

1. A containment device comprising a curtain that can be deployed from a wound or folded first position into an unwound or unfolded second position, comprising a storage box for storing the curtain in the first position, wherein the box is made up of a plurality of juxtaposed modules, the plurality of modules comprising active modules which are provided with means for retaining and releasing the curtain and passive modules which do not have said means for retaining and releasing the curtain. 2. The containment device as claimed in claim 1, wherein the means for retaining and releasing the curtain are actuating cylinders. 3. The containment device as claimed in claim 2, wherein each actuating cylinder of the actuating cylinders comprises a finger able to move between a deployed curtain-retaining position and a retracted curtain-release position. 4. The containment device as claimed in claim 3, wherein the finger of each actuating cylinder is inserted in the deployed position into a first eyelet of an associated curtain retaining strap, the fingers, of the actuating cylinders, in the retracted position releasing the curtain retaining strap so as to allow the curtain to fall. 5. The containment device as claimed in claim 4, comprising a curtain retaining web connected to the straps and on which the curtain rests in the wound position. 6. The containment device as claimed in claim 4, wherein the ends of the straps that accept the fingers of the actuating cylinders are provided with rigid plates in which the first eyelets are made. 7. The containment device as claimed in claim 1, wherein each module of the plurality of modules comprises a rear face for attaching the module to a wall, which rear face is provided with holes for accepting rods projecting from the wall, said holes being sized to allow the modules some clearance with respect to the diameter of the rods. 8. The containment device as claimed in claim 7, wherein the fixing of the module to the rods involves shims to compensate for the clearances for fitting the rear face to the wall. 9. The containment device as claimed in claim 8, wherein at least one of said shims is arranged in the lower part of the module in a space accommodating the curtain, which is rounded in shape and not likely to damage the curtain. 10. The containment device as claimed in claim 7, comprising bars for supporting a top end of the curtain, said bars being fixed to the rear face of each module of the plurality of modules by fixing means which are provided with a range of position adjustment in the vertical direction of deployment of the curtain. 11. The containment device as claimed in claim 1, wherein the each module of the plurality of modules comprises an upper wall, a front wall and lateral walls, the lateral walls comprising rounded cutouts provided with curtain centering plates which press on or cover the external diameter of the rolled curtain. 12. The containment device as claimed in claim 1, wherein the active modules comprise at least one means for disabling the means for retaining and releasing the curtain. 13. The containment device as claimed in claim 4, wherein the active modules comprise at least one means for disabling the means for retaining and releasing the curtain and wherein the means for disabling comprises a handle equipped with a locking bolt which, in a disabling position at least, engages in second eyelets of the straps retaining the curtain whatever the position of the fingers of the actuating cylinders. 14. The containment device as claimed in claim 13, wherein the handle is received in a tube provided with grooves defining three positions of the handle, a curtain installation position, a curtain immobilizing position and a curtain release position, the handle being able to signal these positions to the operator.