Rebar carriage for the construction of concrete structures

Abstract

The present invention refers to a rebar carriage which facilitates rebar placement at the side walls or gables of a concrete structure or a tunnel, previously to concrete pouring. The rebar carriage comprises: a carriage displaceable along a tunnel construction site, and formed by a left-hand side vertical structure, a right-hand side vertical structure and a horizontal structure attached to the side vertical structures. The rebar carriage has a first pair of working platforms extending on a first plane generally parallel to ground, such that one working platform of the first pair is attached to the left-hand side vertical structure, and the other working platform of the first pair is attached to the right-hand side vertical structure. The working platforms of the first pair are extendable and retractable on a plane parallel to ground.

1 . Rebar carriage for the construction of concrete structures, comprising:
 a carriage displaceable along a construction site, and formed by a left-hand side vertical structure, a right-hand side vertical structure and a horizontal structure attached to the side vertical structures, such that the rebar carriage configures a passage in between the side vertical structures for the circulation of vehicles,   a first pair of working platforms extending on a first plane, and wherein one working platform of the first pair is attached to the left-hand side vertical structure, and the other working platform of the first pair is attached to the right-hand side vertical structure, and   wherein the working platforms of the first pair are extendable and retractable.   
     
     
         2 . Rebar carriage according to  claim 1 , wherein the first pair of working platforms extend on a first plane generally parallel to ground, and are extendable and retractable on a plane generally parallel to ground. 
     
     
         3 . Rebar carriage according to  claim 1 , further comprising a second pair of working platforms extending on a second plane placed above the first plane and substantially parallel to the first plane, and wherein the working platforms of the second pair are extendable and retractable. 
     
     
         4 . Rebar carriage according to  claim 3 , wherein the second pair of working platforms extend on a second plane placed above the first plane and generally parallel to the first plane, and wherein the working platforms of the second pair are extendable and retractable on a plane generally parallel to ground. 
     
     
         5 . Rebar carriage according to  claim 1 , wherein the separation distance between the platforms of the first pair with respect to ground, is such that operators can stand and walk on the ground below the platforms of the first pair of platforms. 
     
     
         6 . Rebar carriage according to  claim 3 , wherein the separation distance between the first and the second pairs of platforms is such that operators can stand and walk on the platforms of the first pair of platforms. 
     
     
         7 . Rebar carriage according to  claim 1 , further comprising hydraulic cylinders to extend and retract each working platform individually. 
     
     
         8 . Rebar carriage according to  claim 1 , wherein each working platform is fitted with guardrails at their perimeter. 
     
     
         9 . Rebar carriage according to  claim 3 , further comprising stairs communicating the working platforms of the first and second pair at the same side of the rebar carriage. 
     
     
         10 . Rebar carriage according to  claim 1 , wherein the carriage has four legs and wherein each leg has at least one wheel to allow the rebar carriage displacement. 
     
     
         11 . Rebar carriage according to  claim 10 , wherein the wheels are driven wheels powered by hydraulic motors, which are suitable to move on railway tracks. 
     
     
         12 . Rebar carriage according to  claim 10 , wherein each leg has a self-driven crawler track. 
     
     
         13 . Rebar carriage according to  claim 1 , wherein each working platform has an inner platform part permanently fixed to a corresponding side vertical structure, and a movable part supported by the fixed part and movable on the same plane than the fixed part.