Concrete blocks having through holes for water drainage
AssigneeMetten Produktions-und-Handel GmbH
InventorJosef Metten
Life of this patent
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Abstract
In the case of concrete blocks having narrow through holes for water drainage (perforated blocks), in particular paving stones of various formats and sizes that can be laid on surfaces exposed to the rain, such as streets, paths, squares, parking areas and rings around planted trees, and can be filled by means of jointing means or by means of sand at the lateral ends, the problem exists that the holes become plugged upon jointing or sanding-in. In order to prevent this, the holes are closed at their top end until the jointing or sanding-in operation is complete. This is advantageously accomplished by means of a filling agent that can be floated away or dissolves by means of the addition of water.
Claims20
A concrete block having a plurality of narrow vertical through holes permitting water drainage therethrough and being suitable for use as paving stones which are installed with jointing means between the stones, said concrete block comprising:
- a water soluable filling agent (4) in the upper ends of said through holes, said filling agent (4) becoming flowable upon the addition of water.
A concrete block having a plurality of narrow vertical through holes permitting water drainage therethrough and being suitable for use as paving stones which are laid with jointing means between the stones, said concrete block comprising:
- temporary closure means on top of said block closing the upper end of said through holes.
A method of making a concrete block suitable for use as a paving stone comprising the steps of:
- forming a concrete block with a plurality of vertical through holes permitting water drainage therethrough,
- closing the upper ends of said holes by application of a water soluable filling agent to the upper ends of said holes, and
- drying said filling agent.
Dependencies are inferred from the claim text.