Abstract: A plant and method for the manufacture of cementitious products, viz. cast concrete roof tiles (T), the plant comprising a mixing station where the constituents of a cementitious composition, less an air entraining agent, are admixed under atmospheric pressure and further mixed under a partial vacuum of 200 to 340 mBar after the addition of an air entraining agent, the plant also comprising a moulding station where the tiles (T) are cast in a gang-mould before being cured in a conventional autoclave for up to 10 hours at 45° C. The cured concrete roof tiles (T) are de-moulded after curing and conveyed to a surface preparation zone where a primer coat of a water based epoxy and a surface coating of a water based emulsion paint are applied to at least an upper surface (in use) of the cast concrete roof tiles (T). The admixed cementitious composition has a Ford Cup flow of between 40 and 60 seconds and a slump test of between 180 and 220 mm.

Abstract: A plant and method for the manufacture of cementitious products, viz. cast concrete roof tiles (T), the plant comprising a mixing station (2) where the constituents of a cementitious composition, less an air entraining agent, are admixed under atmospheric pressure and further mixed under a partial vacuum of 200 to 340 mBar after the addition of an air entraining agent, the plant also comprising a molding station (4) where the tiles (T) are cast in a gang-mold (6) before being cured in a conventional autoclave for up to 10 hours at 45 degrees C. The cured concrete roof tiles (T) are de-molded after curing and conveyed to a surface preparation zone (12) where a primer coat of a water based epoxy and a surface coating of a water based emulsion paint are applied to at least an upper surface in use of the cast concrete roof tiles (T). The admixed cementitious composition has a Ford Cup flow of between 40 and 60 seconds and a slump test of between 180 and 220 mm.

Abstract: The invention relates to a device and a method for producing a water barrier in unsolidified roof tile preforms. The inventive device comprises a molded piece with a recess as well as a die. The molded piece is disposed above the end of a roof tile perform, whereupon all or part of the rear edge of the roof tile perform is pressed upward by means of the die. The roof tile perform is then dried.

Abstract: The invention relates to an arrangement and a method for providing a roof tile with at least one water stop. With the arrangement it becomes possible to press a water stop, comprised of a material differing from that of the roof tile, into a roof tile blank. After the water stop has been pressed in, it is partially disposed with its edge in the material of the roof tile blank in the proximity of the watercourse, of the central brim and of the lateral beading.

Abstract: The invention relates to a device and a method for producing a water barrier in unsolidified roof tile preforms. The inventive device comprises a molded piece with a recess as well as a die. The molded piece is disposed above the end of a roof tile perform, whereupon all or part of the rear edge of the roof tile perform is pressed upward by means of the die. The roof tile perform is then dried.

Abstract: A plant and method for the manufacture of cementitious products, viz. cast concrete roof tiles (T), the plant comprising a mixing station (2) where the constituents of a cementitious composition, less an air entraining agent, are admixed under t atmospheric pressure and further mixed under a partial vacuum of 200 to 340 mBar after the addition of an air entraining agent, the plant also comprising a moulding station (4) where the tiles (T) are cast in a gang-mould (6) before being cured in a conventional autoclave for up to 10 hours at 45 degrees C. The cured concrete roof tiles (T) are de-moulded after curing and conveyed to a surface preparation zone (12) where a primer coat of a water based epoxy and a surface coating of a water based emulsion paint are applied to at least an upper surface in use of the cast concrete roof tiles (T). The admixed cementitious composition has a Ford Cup flow of between 40 and 60 seconds and a slump test of between 180 and 220 mm.

Abstract: The invention relates to an arrangement and a method for providing a roof tile with at least one water stop. With the arrangement it becomes possible to press a water stop, comprised of a material differing from that of the roof tile, into a roof tile blank. After the water stop has been pressed in, it is partially disposed with its edge in the material of the roof tile blank in the proximity of the watercourse, of the central brim and of the lateral beading.

Abstract: A conveyor-collator assembly for use in forming stacks of articles, e.g. concrete roof tiles (T) at speeds of up to 200 tiles per minute, is provided with a conveyor means (42) by which tiles (T) are fed seriatim to a velocity control means (72) whereby each tile (T) is transferred under "no-load" or substantially "no-load" conditions onto a falling shelf conveyor (140). Tiles (T) held in the conveyor (140) are thereafter deposited onto a support (26-28) of a stack forming means (24) under "no-load" or substantially "no-load" conditions whereby breakages of tiles (T) due to "shock loads" experienced hitherto in prior art arrangements is eliminated.

Abstract: Liquid metal is supplied from the bottom to the top into a casting mold by way of a casting runner and a filling hole arranged at the lowest point of a casting mold. Direct further use of the casting by avoiding formation of a sprue that must be subsequently processed is possible due to the fact that after totally filling the casting mold and only partial solidification of the metal therein, the casting pressure is decreased or turned off, so that liquid metal flows back out of the casting mold only through a return flow channel having a cross section significantly smaller than the cross section of the casting runner. A ram having a face corresponding in size and shape to the outer contour of the casting in the region of the filling hole is pushed at least over the last segment of the casting runner, thus displacing liquid metal present in the last segment into the casting mold sufficiently far in the direction of the mold interior until the fact of the ram aligns with the inner contour of the casting mold.

Abstract: There are needed for containers for the transportation and/or for the storage of spent fuel elements inner linings which guarantee a good heat contact to the outer container and have little operating expense. This is attained by placing in the outer container a bottom and a flange, then positioning therebetween and welding thereto a jacket provided with an axial slot and thereby a flexible diameter. The slot is then subsequently likewise covered and welded.

Abstract: An improved container for transportation or storage of radioactive substances, especially spent nuclear fuel elements, has a cylindrical open-top thick-wall metallic body for shielding gamma radiation. A liner for the container has a top peripheral flange engaged with the bottom of a counterbore in the container open top. A thick gamma-ray shielding cover for the lining is disposed in the counterbore and screw means detachably secure both the lining flange and the cover to the body independently. The body has exterior generally parallel spaced cooling fins transversely intersected by flanges of lesser height to minimize fin cracks extending into the body. Neutron shielding is disposed in the exterior spaces between the fins and the flanges.

Abstract: An improved cushioning or shock absorbing device attachable to the ends of a generally cylindrical container for transporting or storing radioactive material, especially spent nuclear fuel elements, has a substantially uniform dampening or cushioning characteristic even for different impact directions. The device is cap-shaped, having an annular part with a plug part in the outer end thereof. The annular part includes a strong rigid inner sleeve extending from the open end of the device partly between the two parts. The inner end of the plug part has a sheet metal disc-like inner cover secured to the sleeve for detachment on impact. Both parts are divided into a plurality of interior chambers by sheet metal plates, the chambers being filled with cushioning material.

Abstract: For the transportation and storage of irradiated nuclear fuel elements there are needed combinations of inner and outer containers wherein the inner container should be usable for the storage of the fuel elements in correspondingly conceived fuel element storehouses without reloading, unnecessary waste of space and burden of weight on the storage support.

Abstract: There is provided a shielding container for the transportation and/or storage of spent fuel elements having a neutron shield on the outer container surface wherein the neutron shield is made of a series of hollow pieces made of a good heat conducting material and filled with neutron shielding material, the hollow pieces are joined together and provided with heat conducting fins and are fastened to the container surface.