Method for operating a crane and crane

Patent metadata

Field	Value
Publication number	US-10124993-B2
Application number	US-201514830566-A
Country	US
Kind code	B2
Filing date	Aug 19, 2015
Priority date	Aug 22, 2014
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

The present disclosure relates to a method for operating a crane with a traversable undercarriage, an uppercarriage rotatably mounted on the same with luffing main boom and derrick boom arranged thereon, wherein an auxiliary crane with telescopic boom as derrick ballast is connected with the crane and via the telescopic boom of the auxiliary crane the derrick ballast radius is adjusted. According to the present disclosure, a suspended ballast is lifted in addition to the auxiliary crane provided as derrick ballast for erecting the main boom, wherein first the auxiliary crane is lifted, before the suspended ballast is lifted, when necessary. The present disclosure also relates to a crane for carrying out the method.

First claim

The invention claimed is:

1. A method for operating a crane with a traversable undercarriage, an uppercarriage rotatably mounted on the undercarriage with a luffing main boom and a derrick boom arranged thereon, wherein an auxiliary crane with telescopic boom, the auxiliary crane provided as a derrick ballast, is connected with the crane and via the telescopic boom of the auxiliary crane the derrick ballast radius is adjusted,
wherein during erecting of the main boom, a suspended ballast is lifted in addition to the auxiliary crane, wherein first the auxiliary crane is lifted, before the suspended ballast is lifted, and
wherein at least one guying is arranged between the derrick boom and the auxiliary crane such that guy rods are guided from the derrick boom to a crossbeam, on which a first guying for bracing the auxiliary crane and a second guying for connecting with the suspended ballast are arranged.

2. The method according to claim 1 , wherein the guying for bracing the auxiliary crane is laterally attached to an undercarriage of the auxiliary crane via receptacles.

3. The method according to claim 2 , wherein the auxiliary crane is connected with the crane via the telescopic boom, wherein a boom tip of the auxiliary crane is directly or indirectly connected with one or more of the uppercarriage of the crane, at least one of the receptacles, and the derrick boom of the crane.

4. The method according to claim 3 , wherein the telescopic boom of the auxiliary crane is connected with the crane.

5. The method according to claim 1 , wherein between the derrick boom and the auxiliary crane, a variable-length element is provided, the variable-length element including a hydraulic cylinder.

6. The method according to claim 1 , wherein the suspended ballast includes a derrick ballast pallet.

7. The method according to claim 6 , wherein one or more additional ballast stacks are attached to the crossbeam, the one or more additional ballast stacks attached lateral to the derrick ballast pallet.

8. The method of claim 1 , further comprising:
while erecting the main boom, connecting the auxiliary crane with the telescopic boom as the derrick ballast to the crane; and
via the telescopic boom of the auxiliary crane, adjusting a radius of the derrick ballast.

9. A crane, comprising:
a traversable undercarriage;
an uppercarriage rotatably mounted on the undercarriage with a luffing main boom and a derrick boom arranged thereon;
a derrick ballast including an auxiliary crane, and a suspended ballast, the auxiliary crane and the suspended ballast connected via guying slings to a crossbeam, the crossbeam connected to the derrick boom via guy rods; and
a crane controller,
wherein a variable-length element is provided between the derrick boom and the crossbeam, the variable-length element including a hydraulic cylinder.

10. The crane according to claim 9 , wherein on an undercarriage of the auxiliary crane, receptacles for receiving the guying slings are arranged such that the receptacles are located closer to the crane than an overall center of gravity of the auxiliary crane, wherein the receptacles are demountable or each laterally extendable from the undercarriage of the auxiliary crane.

11. The crane of claim 9 , wherein the crane controller is configured with computer-readable instructions stored on non-transitory memory for:
during erecting of the main boom, lifting the suspended ballast in addition to the auxiliary crane, the auxiliary crane lifted before the suspended ballast is lifted.

12. A method for a crane, comprising:
during erecting of a main boom of the crane,
operating an auxiliary crane as a derrick ballast;
lifting the auxiliary crane before lifting a suspended ballast;
coupling at least one guying sling between a derrick boom of the crane and the auxiliary crane; and
guiding guy rods from the derrick boom to a crossbeam on which a first guying sling for bracing the auxiliary crane and a second guying sling for connecting with the suspended ballast are arranged.

13. The method of claim 12 , wherein the crane includes a traversable undercarriage, an uppercarriage rotatably mounted on the undercarriage, and each of a luffing main boom and a derrick boom arranged on the uppercarriage, and wherein operating the auxiliary crane as a derrick ballast includes adjusting a radius of the derrick ballast via a telescopic boom of the auxiliary crane connected with the crane.

14. The method of claim 12 , further comprising laterally attaching the first guying sling for bracing the auxiliary crane to an undercarriage of the auxiliary crane via one or more receptacles.

15. The method of claim 12 , wherein the suspended ballast includes a derrick ballast pallet.

16. The method of claim 12 , further comprising attaching one or more ballast stacks to the crossbeam in addition to the suspended ballast, the one or more ballast stacks attached lateral to the suspended ballast.

17. The method of claim 12 , wherein the crane further includes the derrick boom, and wherein operating the auxiliary crane as a derrick ballast includes operating a telescopic boom of the auxiliary crane as the derrick ballast.

Assignees

• Liebherr Werk Ehingen

Inventors

• Willim Hans-Dieter

Classifications

• B66C23/82

  Luffing gear · CPC title

• B66C23/76 Primary

  and movable to take account of variations of load or of variations of length of jib · CPC title

• B66C23/62 Primary

  Constructional features or details (of dredgers E02F) · CPC title