Manhole head assembly for manhole column

Abstract

A manhole head assembly for mounting a cover on a manhole column is disclosed. The manhole head assembly comprises a support member having a top portion made of a grindable material and a bottom portion shaped and sized to rest on the manhole column. The top and bottom portions form an inner shoulder sized and shaped to receive the cover. The manhole head assembly further comprises at least one removable spacer adapted to be disposed between the shoulder and the cover for adjusting the height thereof.

What is claimed is:  
     
         1 . A manhole head assembly for mounting a cover on a manhole column, the manhole head assembly comprising: 
 a support member having a top portion made of a grindable material and a bottom portion shaped and sized to rest on the manhole column, the portions forming an inner shoulder sized and shaped to receive the cover; and    at least one removable spacer adapted to be disposed between the shoulder and the cover for adjusting the height thereof.    
     
     
         2 . A manhole head assembly according to  claim 1 , wherein the support member and the top and bottom portions have an annular shape.  
     
     
         3 . A manhole head assembly according to  claim 1 , wherein the material is a polymeric cement.  
     
     
         4 . A manhole head assembly according to  claim 3 , wherein the polymeric cement comprises epoxy resin mixed with quartz of different sizes.  
     
     
         5 . A manhole head assembly according to  claim 4 , wherein the polymeric cement further comprises a metallic mesh.  
     
     
         6 . A manhole head assembly according to  claim 1 , wherein the support member comprises locking means for locking the cover with respect to the support member.  
     
     
         7 . A manhole head assembly according to  claim 1 , wherein the spacer is made of a cushioning material chosen for the group consisting of rubber and flexible polymer.  
     
     
         8 . A manhole column comprising: 
 rims stacked over one another; and    a manhole head assembly for mounting a cover on the manhole column, the manhole head assembly comprising:    a support member having a top portion made of a grindable material and a bottom portion shaped and sized to rest on the upper rim of the manhole column, the portions forming an inner shoulder sized and shaped to receive the cover; and    at least one removable spacer adapted to be disposed between the shoulder and the cover for adjusting the height thereof.    
     
     
         9 . A manhole column according to  claim 8 , wherein the rims, the support member and the top and bottom portions have an annular shape.  
     
     
         10 . A manhole column according to  claim 9 , further comprising rings made of impermeable and cushioning material, adapted to be disposed between the rims.  
     
     
         11 . Method for levelling off a manhole column as defined in  claim 8 , the method comprising the steps of: 
 a) grinding down the top portion of the support member approximately to surface level of surrounding pavement; and    b) adjusting the height of the cover approximately to the level of the top portion obtained in step a) by placing a desired number of spacer between the shoulder and the cover.