CRANE

Abstract

The present invention relates to a crane, in particular in the form of a revolving tower crane, having a jib (3) and a counter-jib (4), which are articulated on a jib articulation piece (8), wherein the jib (3) comprises an outer jib part (3a), which is articulated on an inner jib part (3i) in a hinged manner and is held by a guy (10). According to the invention, the inner jib part (3i) is in the form of a cantilever, which is fastened to the jib articulation piece (8) in a flexurally rigid manner and held, wherein the outer jib part (3a) is articulated on the cantilever in a hinged manner and is held by the guy (10).

Claims

1. A revolving tower crane comprising: a boom and a counterboom articulatably connected to an articulation piece, wherein the boom comprises an outer boom part articulatably pivotally connected to an inner boom part, wherein the outer boom part is held by a guying, and wherein the inner boom part comprises a bending beam flexurally rigidly connected to the articulation piece.

2. The crane of claim 1, wherein the inner boom part is held without guying and wherein the boom is only guyed at the outer boom part.

3. The crane of claim 1, wherein the inner boom part comprises more longitudinal webs than the outer boom part, and wherein the inner boom part has four longitudinal webs and a rectangular or trapezoidal profile cross-section, and wherein the outer boom part has three longitudinal webs and a triangular profile cross-section.

4. The crane of claim 1, wherein the inner boom part has a profile cross-sectional height larger than a maximum profile cross-sectional height of the outer boom part and/or has a profile cross-sectional area larger than the maximum profile cross-sectional area of the outer boom part.

5. The crane of claim 4, wherein a guying of the boom is configured as a single strand.

6. The crane of claim 1, wherein a guying tip is releasably fastened to the articulation piece to which the guying tip of the guying for the outer boom part is lashed.

7. The crane of claim 6, comprising different guying tips having different heights, and wherein the different guying tips are on and rigidly fastened to the articulation piece.

8. The crane of claim 1, wherein the guying is guided continuously free of support from the outer boom part at an acute angle over the inner boom part increasing toward the guying tip.

9. The crane of claim 1, wherein the guying is guided from the outer boom part over a guying support and is connected in an articulated manner at an inner articulation point via or at the articulation piece.

10. The crane of claim 9, wherein the guying is guided from a the guying support approximately in parallel with the longitudinal axis of the inner boom part inwardly to a guying tip seated on the articulation piece.

11. The crane of claim 1, wherein the guying is guided inwardly from the guying support, falling toward the articulation piece at an acute angle to the longitudinal axis of the inner boom part and, wherein the guying is lashed to the articulation piece.

12. The crane of claim 1, wherein a guying support is in the region of the joint between the inner and outer boom parts.

13. The crane of claim 1, wherein the guying support projects over the inner boom part by a height that is from 25% to 200% of the height of the profile of the inner boom part.

14. The crane of claim 1, wherein the counterboom comprises an inner counterboom part configured as a bending beam flexurally rigidly connected to the articulation piece.

15. The crane of claim 14, wherein the counterboom comprises an outer counterboom part articulatably pivotally connected to the inner counterboom part and held by a counterboom guying.

16. The crane of claim 15, wherein the inner counterboom part is held free of guying.

17. The crane of claim 16, wherein the counterboom guying is lashed to a guying tip to which the guying for the boom is lashed.

18. The crane of claim 15, wherein the counterboom guying is lashed to a guying tip to which the guying for the boom is lashed.

19. The crane of claim 1, wherein a counterboom guying is guided over a guying support whose height at least approximately corresponds to the height of a guying tip so that the counterboom guying extends approximately horizontally between a guying support and the guying tip.

20. The crane of claim 1, wherein a counterboom guying is lashed to an inner counterboom part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The invention will be explained in more detail in the following with reference to a preferred embodiment and to associated drawings. There are shown in the drawings:

[0038] FIG. 1 a side view of a crane in the form of a revolving tower crane of an advantageous embodiment of the invention;

[0039] FIG. 2 a side view of the boom of the crane of FIG. 1 that faces the interior boom part formed as a bending beam and the outer, guyed boom part, with the partial views A, B, and C showing different guying variants of the guying of the outer boom part with differently high guying tips and without a guying tip; and

[0040] FIG. 3 a side view of the counterboom of the crane of FIG. 1, with the partial views X, Y, and Z showing different guying variants of the counterboom guying.

DETAILED DESCRIPTION

[0041] As the Figures show, the crane 1 can be configured as a revolving tower crane that comprises a tower 2 standing upright. Said tower 2 can be formed as a bar frame and can, for example, have a rectangular cross-section.

[0042] A boom 3, that can typically be aligned in a level manner, in particular approximately horizontally, is connected in an articulated manner to the upper end of the tower 2. A counterboom 4 that can likewise be arranged in a level manner, in particular horizontally, and that can bear a ballast weight 5 can be provided at the side of the tower 2 opposite the boom 3.

[0043] A trolley 6 can be arranged longitudinally travelably in a manner known per se at the boom 3 to be able to lower and raise the hoist rope 7 and the lifting hook connected thereto closer to the tower 2 or further away from the tower 2. The hoist rope 7 can advantageously be lowered and raised with the aid of a hoisting gear 16 that can be arranged at the counterboom 4 in the vicinity of the ballast weight 5.

[0044] As FIG. 1 shows, both the boom 3 and the counterboom 4 can be fastened to an articulation piece 8 that can be attached to or arranged at the upper end of the tower 2. If the crane is a top-slewer, said articulation piece 8 can be seated on the bearing ring of a slewing gear. If the crane is a bottom-slewer, said articulation piece 8 can be rigidly connected to the tower 2 and/or can form its topmost piece.

[0045] A guying tip 9 to which the guying apparatus for the boom 3 and the counterboom 4 can be lashed can furthermore be seated on said articulation piece 8, as will still be explained in more detail.

[0046] As FIG. 2 shows, the boom 3 comprises an inner boom part 3i and an outer boom part 3a that is pivotally connected in an articulated manner to the outer end of the inner boom part 3i. “Inner” and “outer” mean the outreach or the distance from the tower 2. The inner boom part 3i is disposed closer to the tower 2 than the outer boom part 3a.

[0047] As FIG. 2 shows, the inner boom part 3i is configured as a bending beam that is rigidly and flexurally rigidly fastened to said articulation piece 8, for example by a pin connection or by another shape matching connection of the upper webs and the lower webs of the inner boom part 3i at said articulation connection 8. If the inner boom part 3i is drawn downward or loaded by the trolley 6 or also by its own weight, the upper web or webs are tensioned and the lower web or webs are compressed, with the bending torque being introduced into the articulation piece 8 or being intercepted by the articulatio piece 8.

[0048] As FIG. 1 shows, the inner boom part 3i formed as a bending beam can remain free of guying.

[0049] The guying 10 can hold the outer boom part 3a on its own or can only be guided to the outer boom part 3a that is held by said guying 10.

[0050] As FIG. 2 shows, both boom parts, i.e. the inner and outer boom parts 3i and 3a, can each be configured as frame bearers and/or can be composed of a plurality of boom pieces. Such a frame design can in particular comprise upper webs and lower webs extending in the longitudinal direction being rigidly connected to one another by transverse braces and in particular forming a rigid frame structure.

[0051] The lower webs can here form tracks for the trolley 6.

[0052] The inner and outer boom parts 3i and 3a can here be configured differently. The inner boom part 3i can in particular have a larger profile cross-section and/or have more longitudinal webs than the outer boom part 3a. For example, the boom pieces of the inner boom part 3i can each have four longitudinal webs and the boom pieces of the outer boom part can only have three longitudinal webs, with the inner boom part being able to have a rectangular or trapezoidal profile cross-section having two upper webs and two lower webs, while the outer boom part can have a triangular profile cross-section having one upper web and two lower webs.

[0053] As FIG. 2 shows, the guying 10 for the boom 3 can be formed in one strand.

[0054] In accordance with the embodiment variant A of FIG. 2, the guying 10 can be guided directly and without interposed guying supports from the outer boom part 3a to the guying tip 9.

[0055] Alternatively, the guying 10 an also be guided over a guying support 11 that projects over the upper side of the boom 3 between the two lashing ends of the guying 10. Such a guying support 11 can, for example, be arranged in the region of the joint 15 between the inner and outer boom parts 3 and can, for example, be fastened to the projecting end 12 of the inner boom part 3 formed as a bending beam. It would generally also be possible, however, to arrange said guying support 11 further inwardly toward the tower 2 or also further outwardly at the outer boom part 3a.

[0056] On provision of such a guying support 11, the guying tip 9 provided at the tower 2 can have a smaller height than the partial view B of FIG. 2 shows. The guying support 11 and the guying tip 9 can in particular project substantially equally far upwardly over the boom 3 so that the guying 10 can extend approximately in parallel with the longitudinal axis of the boom 3, more precisely of the inner boom part 3i, and only lowers outwardly from the guying support 11 at an acute angle to the outer boom part 3a, cf. FIG. 2B.

[0057] It is furthermore possible, as the partial view C of FIG. 2 shows, to fully dispense with the guying tip 9 and to lash the guying 10 directly to the articulation piece 8. In this case, the guying 10 lowers inwardly from the guying support 11 toward the tower 2 at an acute angle to the longitudinal axis of the boom 3.

[0058] To be able to provide or mutually replace the different guying variants in a simple manner, the guying tip 9 and the articulation piece 8 can advantageously be formed separately from one another and can be releasably connected to one another. For example, the guying tip 9 can be rigidly connected or latched to the articulation piece 8 by a pin connection or by a similar shape matched connection. If the pins or the connection means are released, the guying tip 9 can be removed and replaced with a different guying tip or completely eliminated.

[0059] As FIG. 3 shows, the counterboom 4 can also have an inner counterboom part 4i that is configured as a bending beam and can be flexurally rigidly connected to the articulation piece 8, for example by a rigid connection such as a pin connection of the upper and lower webs of the inner counterboom part 4a at said articulation piece 8.

[0060] The inner counterboom part 4i can likewise be configured as a frame bearer with upper and lower webs, cf. FIG. 3.

[0061] An outer counterboom part 4a can be fastened in an articulated manner to said inner counterboom part 4i and can be held by a counterboom guying 13.

[0062] Said counterboom guying 13 can likewise be formed in one strand, but with a multistrand counterboom guying also being possible.

[0063] As FIG. 3 shows, the counterboom guying 13 can be guided from an outer end section of the counterboom 4 to the guying tip 9 at which the guying 10 for the boom 3 is also lashed. The counterboom guying 13 can here advantageously be guided over a guying support 14 that is provided, for example, in the region of the joint 15 between the inner and outer counterboom parts 4i and 4a, with here, however, a positioning of the guying support 4 further outwardly or further inwardly also being possible. As FIG. 3a and FIG. 3b show, said guying support 14 can in particular be connected in an articulated manner to the outer end section of the inner counterboom part 4i.

[0064] Said guying support 14 can be adapted in its height above the counterboom 4 to the height of the guying tip 9, in particular such that the counterboom guying 13 is guided approximately horizontally and/or in parallel with the longitudinal axis of the inner counterboom part 4i.

[0065] As FIG. 3c shows, the counterboom guying 13 can, however, also be lashed directly to the inner counterboom part 4i that is configured as a bending beam, in particular to the upper longitudinal web of the inner counterboom part 4i or a guying bearer connected thereto.

[0066] The embodiments of the counterboom guying 13 in accordance with the partial views A and B of FIG. 3 match the statements on the guying 10 of the boom 3 as are shown in the partial views A and B of FIG. 2.

[0067] The variant of the counterboom guying 13 in accordance with partial view C of FIG. 3 can, in contrast, be used for all the variants or independently of the configuration of the guying 10 of the boom 3, i.e. the counterboom guying 13 in accordance with FIG. 3c matches all the variants such as FIG. 2 shows in its partial views A, B, and C.

[0068] The guying variants for the outer boom part 3a, as FIG. 2 shows in its different partial views, can be suitably selected for different variants or outreaches and/or payloads of the boom 3. For shorter booms 3, the guying 10 can optionally also be fully dispensed with and the outer boom part 3a can be flexurally rigidly fastened to the inner boom part 3i, in particular by a shape matched connection of the upper webs.

[0069] The ratio of the lengths of the inner boom part 3i and of the outer boom part 3a can generally be selected as different, with favorable ratios generally resulting when the length of the inner boom part is in the range from 25% to 75% or 30% to 60% or 35% to 50% of the total length of the boom and the length of the outer boom part 3a amounts to 75% to 25% or 70% to 40% or 65% to 50% of the total length of the boom 3.