Device for the overdrilling of underground lines

Abstract

A device for overdrilling an underground line includes a rotating push and/or pull linkage having a front end, and a hollow-cylindrical scavenging head which is connected to the front end of the linkage and is equipped with nozzles. At least one of the nozzles has an outlet axis extending at an inclination in a direction of the line in a plane of a longitudinal axis of the scavenging head. In this way, the orifices of such nozzles which optionally also point opposite to the direction of advance are directed onto the line section.

1 . A device for overdrilling an underground line, comprising: 
 a rotating push and/or pull linkage having a front end; and    a hollow-cylindrical scavenging head connected to the front end of the linkage and equipped with nozzles, wherein at least one of the nozzles has an outlet axis extending at an inclination in a direction of the line in a plane of a longitudinal axis of the scavenging head.    
   
   
       2 . The device of  claim 1 , wherein the outlet axis for the at least one nozzle extends in parallel relationship to the longitudinal axis of the scavenging head.  
   
   
       3 . The device of  claim 1 , wherein a first plurality of the nozzles points in a feed direction, and a second plurality of nozzles points in an opposite direction.  
   
   
       4 . The device of  claim 1 , further comprising a scavenging head carrier and a nozzle ring which connects to the scavenging head carrier and at least partly accommodates the nozzles.  
   
   
       5 . The device of  claim 4 , further comprising a rotary drive connected to the nozzle ring.  
   
   
       6 . The device of  claim 5 , wherein the rotary drive operates in two directions of action.  
   
   
       7 . The device of  claim 4 , wherein the nozzle ring is equipped with cutting and/or broaching tools.  
   
   
       8 . The device of  claim 4 , wherein the nozzle ring has a rounded end face.  
   
   
       9 . The device of  claim 1 , wherein the linkage has a tip provided with at least one nozzle.  
   
   
       10 . The device of  claim 4 , wherein the scavenging head carrier is provided with at least one nozzle.  
   
   
       11 . The device of  claim 1 , wherein the scavenging head carrier has a casing formed with a recess, said front end of the linkage being arranged in the recess of the casing.  
   
   
       12 . The device of  claim 1 , wherein the scavenging head carrier has a beveled rear side.  
   
   
       13 . The use of a nozzle ring of  claim 4  for equipping a scavenging head carrier.