US 12,258,243 B2
Assembly method for crane
Akira Koyahata, Hyogo (JP); and Dairo Matsui, Hyogo (JP)
Assigned to KOBELCO CONSTRUCTION MACHINERY CO., LTD., Hiroshima (JP)
Appl. No. 17/996,823
Filed by KOBELCO CONSTRUCTION MACHINERY CO., LTD., Hiroshima (JP)
PCT Filed Apr. 14, 2021, PCT No. PCT/JP2021/015512
§ 371(c)(1), (2) Date Oct. 21, 2022,
PCT Pub. No. WO2021/220819, PCT Pub. Date Nov. 4, 2021.
Claims priority of application No. 2020-078723 (JP), filed on Apr. 27, 2020.
Prior Publication US 2023/0202808 A1, Jun. 29, 2023
Int. Cl. B66C 23/00 (2006.01); B66C 23/34 (2006.01); B66C 23/42 (2006.01)
CPC B66C 23/348 (2013.01) [B66C 23/42 (2013.01)] 5 Claims
OG exemplary drawing
 
1. An assembly method for a crane which includes:
a lower travelling body capable of travelling on a travelling surface;
an upper slewing body on the lower travelling body, the upper slewing body being slewably supported by the lower travelling body within a plane parallel to the travelling surface;
a boom having a boom base end coupled to the upper slewing body and a boom front end located opposite to the boom base end, the boom being supported by the upper slewing body so as to be capable of rising and falling;
a jib having a jib base end coupled to the boom front end and a jib front end located opposite to the jib base end and supporting a load-suspending cable, the jib being supported by the boom so as to be capable of rising and falling; and
at least one strut having a strut base end rotatably coupled to the jib base end or the boom front end, the at least one strut having a strut front end located opposite to the strut base end, the strut front end being connected to the jib front end at least via a front side guy line,
the method comprising:
a strut coupling step of rotatably coupling the strut base end of the at least one strut to the jib base end or the boom front end;
a cylinder connecting step of extending a cylinder unit having one end supported by one structure that is one of the at least one strut and the boom, and the other end opposite to the one end, the cylinder unit being capable of extending/contracting, to connect the other end of the cylinder unit to the other structure that is one of the at least one strut and the boom and different from the one structure;
a strut raising step of causing the cylinder unit to contract to raise the at least one strut with the strut base end as a fulcrum;
a strut supporting step of stretching a stretching member between the strut front end of the at least one strut and a specific part of the boom, the specific part being closer to the boom base end than the boom front end, to support the at least one strut in a raised state; and
a rail laying step of laying a rail on the other structure,
wherein the cylinder connecting step includes causing the other end of the cylinder unit to keep moving on the rail as a result of extension of the cylinder unit until reaching a position where the other end is connected to the other structure.