Support element for underground underworkings

Abstract

A support element for underground underworkings has a sleeve of a flexible fabric permeable to water and air. A central column having a T-shaped vertical cross-section, comprised of a column shaft and a disk-shaped column head, is arranged in the sleeve and made of a hydraulically binding and expandable material introduced under pressure into the sleeve and solidifying in the sleeve to form the central column. A jacket surrounds the column shaft and consists of stacked, empty, fire-retardant automobile tires having openings allowing water, contained in the hydraulically binding and expandable material, and air to exit.

What is claimed is:  
     
         1 . A support element for underground underworkings, the support element comprising: 
 a sleeve of a flexible fabric permeable to water and air;    a central column having a T-shaped vertical cross-section, comprised of a column shaft and a disk-shaped column head, and comprised of a hydraulically binding and expandable material introduced under pressure into the sleeve and solidifying in the sleeve to form the central column; and    a jacket surrounding the column shaft, comprised of stacked, empty, fire-retardant automobile tires having openings allowing water, contained in the hydraulically binding and expandable material, and air to exit.    
     
     
         2 . Support element according to  claim 1 , wherein between the disk-shaped column head and a top wall of the underworkings a head plate is provided and between the column head and the jacket a circular ring-shaped pressure plate is arranged.  
     
     
         3 . The support element according to  claim 2 , wherein the head plate is flexible at least to a limited extent.  
     
     
         4 . The support element according to  claim 1 , further comprising a receptacle with a bottom plate, wherein the receptacle is open in the direction toward the top wall, wherein the receptacle is configured to receive a lower end section of the column shaft facing the footwall.  
     
     
         5 . The support element according to  claim 4 , wherein the receptacle has a sleeve-shaped receiving section for the end section of the column shaft, wherein the receiving section is comprised of a support bottom and a conical bottom section conically widening in the direction toward the footwall.  
     
     
         6 . The support element according to  claim 5 , wherein the receiving section has at least one opening allowing water contained in the hydraulically binding and expandable material to exit.  
     
     
         7 . The support element according to  claim 5 , wherein the support bottom of the receiving section is flexible at least to a limited extent.  
     
     
         8 . The support element according to  claim 1 , wherein a section of the sleeve surrounding the column shaft comprises a filling conduit having an integrated filling valve, wherein the filling conduit extends through the jacket.