Prop device for mining and tunnel construction

Abstract

To temporarily secure pit and tunnel construction a prop device 1 is intended which consists of an inner pipe 2 and an out pipe 3 which can be moved while inserted in each other. The pulling apart motion is initiated when a liquid is filled into a filler opening 11 into the outer pipe 3 whose cavity 9, 2 is separated form the cavity 9 by a plate 10 . This plate 10 features a weak point 18 . Endangerment of the workers is therefore eliminated. After the extension of the inner pipe 2 from the outer pipe 3 the partial wedges 40, 41, 42 are pushed into the remaining narrow gap 45 so that the desired locking effect takes immediately place. The water or liquid can exit again from the cavity 9, 2 via the filler opening 11 . A very light prop device 1 that absorbs sufficient straining forces has been created.

1 . a prop device for underground mining and tunnel construction with an inner and outer pipe ( 2 ,  3 ) which can be pushed into each other and which can be linked via wedges ( 8 ) and which are closed on the free ends ( 4 ,  6 ) with a footer ( 7 ) or header plate ( 5 ) while the cavities ( 9 ) of the inner pipe ( 2 ) and the outer pipe ( 3 ) are separated by a plate ( 10 ) and a filler opening ( 11 ) is intended in the outer pipe ( 3 ),  
       characterized by the fact  
       that the filler opening ( 11 ) features the form of only a spout ( 12 ) and that the wedges ( 8 ) are positioned in a narrow opening ( 45 ) between a cylindrical expansion which forms the head ( 14 ) of the outer pipe and the inner pipe and that they are held by a place holder in their position:  
     
     
         2 . Prop device according to  claim 1 ,  
       characterized by the fact  
       that the spout ( 12 ) is fitted with a brace ( 16 ) that fixates the pistol that sets the water pressure during the filling process.  
     
     
         3 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the outer and inner pipes ( 2 ,  3 ) are designed to allow a continuously variable extension of 300-500 mm.  
     
     
         4 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the plate ( 10 ) corresponds with the inner pipe ( 2 ) and features a weak point ( 18 ) which bursts when the allowed filling pressure in the outer pipe ( 3 ) is exceeded.  
     
     
         5 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the plate ( 10 ) is made out of rubber or compatible work material and features a weak point ( 18 ) in the middle.  
     
     
         6 . Prop device according to  claim 5 ,  
       characterized by the fact  
       that the weak point breaks at +100 bar.  
     
     
         7 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the outer pipe ( 3 ) and the footer plate ( 7 ) are linked with each other via a welded seam ( 19 ).  
     
     
         8 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the head plate ( 5 ) is attached to the inner pipe ( 2 ) on several, preferably three fixating points ( 20 ).  
     
     
         9 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the head ( 14 ) of the outer pipe ( 3 ) features a slope ( 22 ) on the side facing the inner pipe ( 2 ) which corresponds with the wedges ( 8 ) whereas the sides ( 23 ,  24 ) of the wedge ( 8 ) and the inner pipe ( 2 ) that connect with each other run vertical and parallel towards each other.  
     
     
         10 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that between the upper edge ( 26 ) of the wedges ( 8 ) and the bottom ( 27 ) of the header plate ( 5 ) a cylinder spring ( 28 ) is positioned which acts as a place holder ( 15 ).  
     
     
         11 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the upper end ( 29 ) of the sides ( 23 ,  24 ) of the wedges ( 8 ) and/or the outer wall ( 30 ) of the inner pipe ( 2 ) is equipped with a saw tooth thread ( 31 ).  
     
     
         12 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the head ( 14 ) of the outer pipe ( 3 ) is shaped as a pot and is connected via a weld ( 32 ) with the upper end piece ( 33 ) of the outer pipe ( 3 ).  
     
     
         13 . Prop device according to  claim 10 ,  
       characterized by the fact  
       that a middle piece is positioned between cylinder spring and the bottom of the header plate which acts as a spring lock and is connected with the head of the outer pipe via a piece of wire which can be detached.  
     
     
         14 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the header plate ( 5 ) as well as the footer plate ( 7 ) feature cams ( 38 ,  39 ) which extend over the outer surface ( 37 ).  
     
     
         15 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the wedge ( 8 ) consists of three partial wedges ( 40 ,  41 ,  42 ) which are held in place and positioned in a distance to each other by a holding wire ( 43 ).  
     
     
         16 . Prop device according to one of the previous claims,  
       characterized by the fact  
       that the partial wedges ( 40 ,  42 ,  42 ) are held in a distance to each other by a holding wire ( 43 ) which features indentations ( 44 ) that pre-determine the distance.