ROTARY TOWER CRANE HAVING A TOWER MAST THAT CONSISTS OF A PLURALITY OF TOWER SECTIONS

Abstract

The invention relates to a rotary tower crane (10) having a tower mast (2) at the upper end of which a jib (8) is arranged, at least part of the tower mast being formed by at least three parallel tower sections (7) arranged next to one another.

Claims

1. A revolving tower crane (10) having a tower structure (2) at whose upper end a boom (8) is arranged, wherein at least some of the tower structure (2) is formed by at least three parallel tower sections (1) arranged next to one another.

2. A revolving tower crane (10) in accordance with claim 1, wherein some of the tower structure (2) is formed by a single tower section (7) that is preferably wider than each of the at least three parallel tower sections (1).

3. A revolving tower crane (10) in accordance with claim 1, wherein a transition section (6) is arranged above the at least three parallel tower sections (1) and connects them to one another.

4. A revolving tower crane (10) in accordance with claim 3, wherein the transition section (6) has an upwardly tapering conical shape and is preferably designed as a lattice element, as a tower section, or as a frame.

5. A revolving tower crane (10) in accordance with claim 3, wherein the transition section (6) connects the at least three parallel tower sections (1) to a single tower section (7), with the single tower section (7) preferably being wider than each of the parallel tower sections (1).

6. A revolving tower crane (10) in accordance with claim 1, wherein the at least three parallel tower sections (1) are connected to a foundation cross (3) or tan undercarriage of the revolving tower crane (10) via foundation anchors (4).

7. A revolving tower crane (10) in accordance with claim 1, wherein the at least three parallel tower sections (1) represent independent crane towers or at least parts thereof that can be used in other revolving tower cranes.

8. A revolving tower crane (10) in accordance with claim 2, wherein the single tower section (7) represents an independent crane tower or at least a part thereof that can be used in another revolving tower crane.

9. A revolving tower crane (10) in accordance with claim 1, wherein the at least three parallel tower sections (1) are connected to one another by reinforcement portions (5).

10. A transition section (6) for connecting at least three parallel tower sections (1) of a revolving tower crane (10) in accordance with claim 3.

11. A revolving tower crane (10) in accordance with claim 2, wherein a transition section (6) is arranged above the at least three parallel tower sections (1) and connects them to one another.

12. A revolving tower crane (10) in accordance with claim 11, wherein the transition section (6) has an upwardly tapering conical shape and is preferably designed as a lattice element, as a tower section, or as a frame.

13. A revolving tower crane (10) in accordance with claim 12, wherein the transition section (6) connects the at least three parallel tower sections (1) to a single tower section (7), with the single tower section (7) preferably being wider than each of the parallel tower sections (1).

14. A revolving tower crane (10) in accordance with claim 4, wherein the transition section (6) connects the at least three parallel tower sections (1) to a single tower section (7), with the single tower section (7) preferably being wider than each of the parallel tower sections (1).

15. A revolving tower crane (10) in accordance with claim 14, wherein the at least three parallel tower sections (1) are connected to a foundation cross (3) or an undercarriage of the revolving tower crane (10) via foundation anchors (4).

16. A revolving tower crane (10) in accordance with claim 13, wherein the at least three parallel tower sections (1) are connected to a foundation cross (3) or an undercarriage of the revolving tower crane (10) via foundation anchors (4).

17. A revolving tower crane (10) in accordance with claim 12, wherein the at least three parallel tower sections (1) are connected to a foundation cross (3) or an undercarriage of the revolving tower crane (10) via foundation anchors (4).

18. A revolving tower crane (10) in accordance with claim 11, wherein the at least three parallel tower sections (1) are connected to a foundation cross (3) or an undercarriage of the revolving tower crane (10) via foundation anchors (4).

19. A revolving tower crane (10) in accordance with claim 5, wherein the at least three parallel tower sections (1) are connected to a foundation cross (3) or an undercarriage of the revolving tower crane (10) via foundation anchors (4).

20. A revolving tower crane (10) in accordance with claim 4, wherein the at least three parallel tower sections (1) are connected to a foundation cross (3) or an undercarriage of the revolving tower crane (10) via foundation anchors (4).

Description

[0021] Further features, details, and advantages of the invention result from the embodiments explained with reference to the Figures. There are shown:

[0022] FIG. 1: an embodiment of the revolving tower crane in accordance with the invention in a side view;

[0023] FIG. 2a: a cross-sectional plan view through the lower portion of the tower structure of the embodiment in accordance with FIG. 1 with four parallel tower sections; and

[0024] FIG. 2b: an alternative embodiment of the revolving tower crane in accordance with the invention with three parallel tower sections in a cross-sectional plan view through the lower portion of the tower structure.

[0025] An embodiment of the revolving tower crane 10 in accordance with the invention is shown in a side view in FIG. 1. The revolving tower crane 10 is designed as a top-slewing crane and has a tower structure 2 to whose upper end a boom 8, comprising a main boom and a counterboom, is rotatably fastened via a slewing gear.

[0026] The tower structure 2 has three portions. The upper portion that is connected to the boom 8 is formed by a single tower section 7. The lower portion that is connected to the crane foundation 3 is formed by four parallel tower sections 1 that are arranged next to one another and that each have a smaller width or outer periphery than the single tower section 7. The smaller tower sections 1 here form the corners of a square and are connected to the single wider tower section 7 via a conically shaped transition section 6 (middle portion). To increase the stability, the smaller tower sections 1 are connected to one another by additional reinforcement portions.

[0027] The smaller tower sections 1 are connected via foundation anchors 4 to a crane foundation 3 which can, for example, be a foundation cross. The revolving tower crane 10 in accordance with the invention can alternatively be a bottom-slewing crane. In this case, the smaller tower sections 1 can be connected to a rotatable undercarriage of the crane 10. It is likewise possible that the smaller tower sections 1 are connected to a further transition section that is in turn connected to a foundation cross or undercarriage.

[0028] A section (plan view) marked by the arrows marked by “A” through the lower section of the tower structure 2 is shown in FIG. 2a. It can be recognized that the four parallel tower sections 1 form the corners of a square, whereby a high stability of the tower structure 2 is ensured.

[0029] An alternative embodiment having only three smaller parallel tower sections 1 is shown in FIG. 2b that represents the same cross-sectional view as FIG. 2a. The three smaller tower sections 1 are placed rotated with respect to one another here and form the corners of an equilateral triangle. A high stability is likewise hereby achieved, with a smaller tower section 1 being used less than in the embodiment of FIGS. 1 and 2a. It is, however, also possible to use a smaller number or arrangement of the smaller tower sections 1 for the tower structure 2 depending on the demand on stability, hook height, economy, etc.

[0030] The invention is based on the insight that a plurality of smaller tower sections 1 can enable a more stable crane tower configuration than a single wider or thicker tower section 7. Smaller tower sections 1 of other crane systems are furthermore typically available more favorably and better on the market than larger crane towers 7. Tower sections 1 of smaller crane systems are frequently kept ready without being used and can thus be used simply and inexpensively in the tower structure 2 of a revolving tower crane 10 in accordance with the invention.

[0031] A tower system can, for example, be built by the use of four tower sections 1 of the type Liebherr 120 HC that is stronger, more stable, and, with respect to the price per meter, less expensive than a single larger crane tower of the type 1250 HC. It is thereby possible to provide e.g. free-standing cranes of the type Liebherr 550/630/1000 EC-H with hook heights of over 100 m. Smaller tower sections of the type 120 HC are furthermore more economical in assembly and are better available on the market than larger tower sections of the type 1250 HC.

REFERENCE NUMERAL LIST

[0032] 1 tower section [0033] 2 tower structure [0034] 3 crane foundation [0035] 4 foundation anchors [0036] 5 reinforcement portion [0037] 6 transition section [0038] 7 tower section [0039] 8 boom [0040] 10 revolving tower crane