Scaffold

Abstract

Scaffolding unit to be attached to the deck structure of a bridge or similar comprises a set of arms for carrying working levels and the support structures needed in work and an attachment frame for attaching the set of arms to the upper surface of the deck structure. The set of arms is connected to the attachment frame by means of a pivoted parallelogram.

1 . A scaffolding unit to be attached to a bridge or similar deck structure, comprising:
 a set of arms for carrying the working levels and support structures needed in work, and   an attachment framed for attaching the set of arms to the upper surface of the bridge or similar deck structure,   wherein the set of arms is connected to the attachment frame by means of a pivoted rectangle.   
     
     
         2 . The scaffolding unit according to  claim 1 ,
 wherein the pivoted rectangle is a pivoted parallelogram.   
     
     
         3 . The scaffolding unit according to  claim 1 ,
 wherein the pivoted rectangle comprises an upper and a lower beam and pivot points for connecting the beams to the attachment frame and the set of arms.   
     
     
         4 . The scaffolding unit according to  3 ,
 wherein the pivot points of the attachment frame are on a straight line parallel to the pivot points of the set of arms, according to the definition of a pivoted parallelogram, and the straight lines are preferably vertical.   
     
     
         5 . The scaffolding unit according to  claim 2 ,
 wherein the lower beam of the pivoted parallelogram is a triangular beam.   
     
     
         6 . The scaffolding unit according to  claim 1 ,
 further comprising at least one operating device for adjusting the position of the pivoted rectangle and the set of arms attached to it.   
     
     
         7 . The scaffolding unit according to  claim 1 ,
 wherein at least the joints between the set of arms, the attachment frame, and the pivoted rectangle are implemented with detachable attachment elements.   
     
     
         8 . The scaffolding unit according to  claim 7 ,
 wherein the attachment elements are pivot pins.   
     
     
         9 . The scaffolding unit according to  claim 1 ,
 further comprising a vertical arm and a carrier beam attached transversely to one end of the scaffolding, wherein the lower and upper beams are attached to the vertical arm by means of lugs, the lugs further comprising one row of holes wherein there is a first distance between the holes, and in which the vertical arm there is a row of holes, in which there is a different between the holes than between the lugs' holes.   
     
     
         10 . The scaffolding unit according to  claim 9 ,
 wherein the distances between the holes in the vertical arm are greater than the distances between the holes in the lugs.   
     
     
         11 . The scaffolding unit according to  claim 8 ,
 wherein the vertical arm and the carrier beam are attached to each other by means of lugs at the end of the vertical arm, the lugs further comprising a row of holes, in which there is a first distance between the holes and in which the carrier beam there is a row of holes, in which there is a different distance between the holes than between the lugs' holes.   
     
     
         12 . The scaffolding unit according to  claim 11 ,
 wherein the distances between the holes in the carrier beam are greater than the distances between the vertical arm's lugs.   
     
     
         13 . The scaffolding unit according to  claim 1 ,
 wherein at least one of the upper or lower beams extends to the opposite side of the pivot point between the attachment frame and the lower beam relative to the vertical arm in such a way that the lower beam forms a lever on both sides of the lower pivot point of the attachment frame.   
     
     
         14 . The scaffolding unit according to  claim 6 ,
 wherein at least one operating device from a group hydraulic jack and screw jack is arranged at the end of the lever formed by at least one of the lower or upper beams on the opposite side of the pivot point between the attachment frame and the lower beam relative to the vertical arm.