Concrete Expansion Joint Forming Device

Abstract

In one aspect of the present invention there is provided an expansion joint strip support module 12 comprising an expansion joint strip locating portion 24 adapted to locate an expansion joint strip 20 and one or more support means 26 and 28 integral with and arranged to support the expansion joint strip locating portion. In a further aspect of the present invention there is provided an expansion joint crack forming device comprising: an elongate base strip 14 being adapted to extend along a proposed expansion joint; and a crack forming projection 84 connected to the base strip 14 and designed to form a cavity in a concrete slab which is to be formed on top of the base strip 14 , the crack forming projection 84 being positioned to promote cracking of the concrete slab along the proposed expansion joint.

1 - 38 . (canceled) 
   
   
       39 : A support assembly for an expansion joint strip, said assembly comprising:
 an elongate base strip including at least two laterally spaced locating walls;   a plurality of discrete support modules each being detachably connected to the locating walls at longitudinally spaced positions along the base strip; and   means for adjusting the height of the expansion joint strip relative to at least one of the support modules.   
   
   
       40 : The support assembly of  claim 39  also comprising an expansion joint strip cover adapted to support the expansion join strip and being arranged to be supported by one or more of the support modules. 
   
   
       41 : The support assembly of  claim 40  wherein each of the modules includes a U-shaped channel configured to cradle the expansion joint strip cover. 
   
   
       42 : The support assembly of  claim 40  wherein the height adjustment means includes a pin being designed to locate at one of a plurality of different height positions relative to the corresponding support module. 
   
   
       43 : The support assembly of  claim 42  wherein the pin is received in one of a plurality of locating holes in the support module, the strip cover being designed to rest on the pin to support the expansion joint strip at the required height. 
   
   
       44 : The support assembly of  claim 43  wherein the pin is enlarged at one end for press-fit engagement with said one of the locating holes. 
   
   
       45 : The support assembly of  claim 39  wherein the locating walls are each in the form of stiffening ribs designed to strengthen the base strip. 
   
   
       46 : The support assembly of  claim 45  wherein the support modules include a pair of spaced support legs each being perforated to promote the flow of concrete and encasing of said modules. 
   
   
       47 : The support assembly of  claim 39  wherein said locating walls include a pair of outer locating walls and a central locating wall. 
   
   
       48 : The support assembly of  claim 47  wherein the base strip includes a groove or slot underlying the central wall and designed to allow lateral movement of the strip. 
   
   
       49 : The support assembly of  claim 39  also comprising another base strip joined to said base strip at an expansion joint juncture. 
   
   
       50 : A method of installing an expansion joint strip in a concrete slab, said method comprising the steps of:
 providing an elongate base strip having at least two laterally spaced locating walls;   providing a plurality of discrete support modules;   fitting two or more of the support modules to the locating walls of the base strip at spaced longitudinal positions along the base strip;   placing the expansion joint strip upon one or more of the modules and adjusting the height of said strip relative to at least one of said modules; and   pouring concrete to at least partly bury the base strip, the support modules and the expansion joint strip.