Dismantlable lattice piece for crane boom

Abstract

The disclosure relates to a dismantlable lattice piece for a crane boom. The lattice piece comprising two corner bar sides that are each formed by at least two corner bars that are fixedly welded to one another by a plurality of connection bars and comprising a transverse connection gibbable with the corner bar plates.

1 . A dismantlable lattice piece for a crane boom comprising:
 two lateral corner bar parts that each comprise at least two corner bars that are fixedly welded to one another by a plurality of connection bars, and   at least one transverse connection that connects the lateral corner bar parts and is gibbed to the lateral corner bar parts.   
     
     
         2 . The lattice piece in accordance with  claim 1 , wherein the transverse connection comprises a plurality of diagonal bars gibbed with the lateral corner bar parts, and the diagonal bars of the transverse connection being gibbed to a corner bar, a post, to another connection bar, or to a fork-finger connection of the lateral corner bar part. 
     
     
         3 . The lattice piece in accordance with  claim 2 , wherein the transverse connection comprises two planar lattice plates gibbed in a perpendicular manner to the lateral corner bar part, with the lattice plates being gibbed with the end regions of the lateral corner bar parts and forming side surfaces of the lattice piece. 
     
     
         4 . The lattice piece in accordance with  claim 3 , wherein the lattice plates comprise two parallel longitudinal beams that are connected by diagonal bars and/or by posts. 
     
     
         5 . The lattice piece in accordance with  claim 1 , wherein the lateral corner bar parts each have at least two, connection consoles, to connect lateral corner bar parts to one another, and the corner bar parts are stacked onto one another for the transport. 
     
     
         6 . The lattice piece in accordance with  claim 1 , wherein the at least two lateral corner bar parts are spatial lateral corner bar parts that each comprise four corner bars, with the corner bars disposed in one plane being fixedly welded to one another by connection bars. 
     
     
         7 . The lattice piece in accordance with  claim 6 , wherein the two lateral corner bar parts are gibbed to one another by an x-shaped transverse connection. 
     
     
         8 . The lattice piece in accordance with  claim 7 , wherein the x-shaped transverse connection is formed by at least one pair of intersecting diagonal bars with the at least one pair being disposed in parallel with one another and welded to one another by means of bars. 
     
     
         9 . The lattice piece in accordance with  claim 8 , wherein the intersecting diagonal bars are connected to one another at the point of intersection pivotable about a transverse axis. 
     
     
         10 . The lattice piece in accordance  claim 9 , wherein two planar lattice plates are gibbed in a perpendicular manner to the lateral corner bar parts, are gibbed with the end regions of the lateral corner bar parts, and form side surfaces of the lattice piece. 
     
     
         11 . The lattice piece in accordance with  claim 10 , wherein the lattice plates each comprise two parallel longitudinal beams that are connected by diagonal bars and/or posts; and/or the lattice plates are gibbed with the ends of the x-shaped transverse connection. 
     
     
         12 . The lattice piece in accordance  claim 1 , wherein one or more of the following applies:
 the working height of a lattice piece substantially corresponds to the transport width of a transport unit formed from the individual parts of the lattice piece;   all the individual parts of a lattice piece form a transport unit; and   the lateral corner bar parts are rotated by 90° about the longitudinal axis of a corner bar with respect to the assembly position.   
     
     
         13 . A crane having at least one lattice piece in accordance with  claim 1 . 
     
     
         14 . A method of assembling a lattice piece comprising the steps:
 erecting a corner bar plate by 90° and fixing the corner bar plates to an assembly frame and/or to an assembly console such that is stands on the assembly frame and/or on the assembly console;   erecting a second corner bar plate about 90° such that it stands on a corner bar and connecting the corner bar plate to the assembly frame and/or to the assembly console;   assembly or unfolding of the first lattice plate and connecting the lattice plate to the oppositely disposed corner bar plate;   inserting at least one diagonal bar; and   assembly or unfolding of the second lattice plate and connecting the second lattice plate to the oppositely disposed corner bar plate.   
     
     
         15 . The method in accordance with  claim 14 , wherein all the further diagonal bars are inserted after the assembly of the second lattice plate, with all the bars first being inserted between the corner bars lying on the ground or being close to the ground, and metal gangway plates being installed at the diagonal bars after the insertion of the diagonal bars. 
     
     
         16 . The method in accordance with  claim 14 , further comprising the steps:
 erecting the x-shaped transverse bracing by rotation by 90° at its longitudinal axis;   positioning the x-shaped transverse bracing in an assembly frame;   unfolding the first and second lattice plates; and   erecting the first and second corner bar plates by a 90° rotation about their longitudinal axes and gibbing to the x-shaped transverse bracing.   
     
     
         17 . The lattice piece in accordance with  claim 4 , wherein the diagonal bars and/or posts are fixedly welded to one another. 
     
     
         18 . The lattice piece in accordance with  claim 5 , wherein the connection consoles are twistlock consoles. 
     
     
         19 . The lattice piece in accordance with  claim 6 , wherein the connection bars are diagonal bars and/or posts. 
     
     
         20 . The lattice piece in accordance with  claim 11 , wherein the two longitudinal beams are fixedly welded together.