Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
  • B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
  • B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
  • B28B23/06—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed for the production of elongated articles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B28—WORKING CEMENT, CLAY, OR STONE
  • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
  • B28B5/00—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping
  • B28B5/02—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type
  • B28B5/026—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length
  • B28B5/028—Producing shaped articles from the material in moulds or on moulding surfaces, carried or formed by, in or on conveyors irrespective of the manner of shaping on conveyors of the endless-belt or chain type the shaped articles being of indefinite length the moulding surfaces being of definite length, e.g. succession of moving pallets, and being continuously fed

Definitions

• This invention relates to a method of producing a prestressed continuous concrete product, according to which method
• the hardened concrete blank is continuously displaced away from the concrete supply to a hardening area simultaneously as said prestressing wires are retarded
• 4,186,169 disclose a method of mould casting, wherein prestressing of the wires is effected by pushing the mould sequence forward step by step by using locking means for the wires and by receiving the tension of the wires by means of a cross-head during the pushing movement.
• the locking points of the wires must be changed for each mould unit in the sequence of moulds in order to couple a new mould unit to the sequence.
• Such continuous alternately occuring fastening and opening of the locking points is, however, very laborious and time consuming. Further, it is difficult to ensure an even prestressing of the wires, because the locking points thereof are constantly altered during the pushing movement.
• This kind of casting method is not suitable for producing a continuous concrete product, either, because said pushing method requires separate moulds, which are limited with respect to the casting surface, and because the moulds allowing cast ⁇ ing of such concrete products only which have a length not more than one mould unit length.
• the mould units are formed by longitudinal boards, trans ⁇ versal boards and bottom boards.
• said transversal and longitudinal boards are provided with matching coupling means.
• the longitudinal boards of the moulds are thus indispensable with respect to the firmness of the mould sequence. Therefore the - _ apparatus is not suitable for the production of an endless concrete product, because the casting surface is not uninterruptedly open in the direction of movement of the mould sequence.
• the discharge end does not have any fixed discharge point in the production line, but the length of the production line can be varied according to the hardening time of the concrete and the required produc ⁇ tion capacity simply by coupling more mould units to the supply end of the mould sequence.
• the casting bed can be made continuous over the whole length of the mould sequence and the casting bed is thus suitable for continuously casting endless concrete products. Because the prestressing wires are not exposed to any other forces except the continuous uniform pushing force caused by the pushing device, it is possible to maintain the stress of the prestressing wires accurately constant. Besides, it is easy to interconnect and accurately synchronize the pushing movement of the displacing device and the retarding movement of the wire reel, bacause the displacing device and the wire reel are positioned very close to each other.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Chemical & Material Sciences (AREA)
• Ceramic Engineering (AREA)
• Mechanical Engineering (AREA)
• Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
• Control And Other Processes For Unpacking Of Materials (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Medicinal Preparation (AREA)
• Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8518839

Family Applications (1)

Country Status (5)

Cited By (4)

Families Citing this family (1)

Citations (3)

Family Cites Families (2)

• 1984
  • 1984-04-02 FI FI841310A patent/FI73383C/fi not_active IP Right Cessation
• 1985
  • 1985-04-01 DE DE19853590131 patent/DE3590131T/de active Pending
  • 1985-04-01 WO PCT/FI1985/000034 patent/WO1985004362A1/en active Application Filing
  • 1985-04-01 DE DE3590131A patent/DE3590131C2/de not_active Expired - Fee Related
  • 1985-12-02 NO NO854835A patent/NO854835L/no unknown
• 1986
  • 1986-10-02 SE SE8604198A patent/SE459797B/sv not_active IP Right Cessation

Patent Citations (3)

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