Leave-in-Place Concrete Retention forms

Abstract

A form into which concrete may be poured for the formation of grid pavement in situ is comprised of a sheet base having top and bottom surfaces, the top surface having a plurality of hollow frusta projecting there from preferably in a uniform pattern and creating an interstitial space there between within which a first site material, namely concrete, is poured to create a grid with areas and a second site material, namely soil, sand or an aggregate, occupies the frusta and is in communication with the underlying subsoil. In order to prevent wet concrete from infiltrating the hollowed frusta during pouring of concrete into the interstitial space, lids of a preferably biodegradable substance such as compressed peat are inserted into or over the frusta openings. The lids may be easily broken into pieces which fall into the hollowed frusta after the concrete has cured so that the second site material can be added therein. When the second material is soil, the peat will increase the soil's capacity to retain moisture and add nutrients promoting vegetation growth. Removable lids are also contemplated.

1 . A leave-in-place concrete retention form, comprising a plurality of hollow frusta projecting from a surface of a base; each of said plurality of hollow frusta having a proximal opening and a distal opening; said proximal opening being through said base; said distal opening having a lid. 
   
   
       2 . A leave-in-place concrete retention form, comprising:
 a) a base having a plurality of openings;   b) a plurality of hollow frusta projecting from a surface of said base; each of said plurality of hollow frusta having a void in communication with one of said plurality of openings; each of said frusta further having a distal opening; and   c) a plurality of lids; each of said plurality of lids covering said distal opening of each of said plurality of frusta.   
   
   
       3 . A leave-in-place concrete retention form, comprising:
 a) a base having a plurality of openings; each of said plurality of openings having a perimeter;   b) a plurality of hollow frusta projecting from a surface of said base; each of said plurality of hollow frusta having at least one, but not two, side walls, a proximal end and a distal end; said proximal end being in communication with said perimeter of said opening; said distal end being truncated and terminating in a distal edge;   c) a distal opening defined by said distal edge; and   d) a plurality of lids; each of said plurality of lids covering said distal opening of each of said plurality of frusta.